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| -rw-r--r-- | drivers/gpu/drm/i915/i915_perf.c | 4624 |
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diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c new file mode 100644 index 000000000..2d4f09813 --- /dev/null +++ b/drivers/gpu/drm/i915/i915_perf.c @@ -0,0 +1,4624 @@ +/* + * Copyright © 2015-2016 Intel Corporation + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS + * IN THE SOFTWARE. + * + * Authors: + * Robert Bragg <robert@sixbynine.org> + */ + + +/** + * DOC: i915 Perf Overview + * + * Gen graphics supports a large number of performance counters that can help + * driver and application developers understand and optimize their use of the + * GPU. + * + * This i915 perf interface enables userspace to configure and open a file + * descriptor representing a stream of GPU metrics which can then be read() as + * a stream of sample records. + * + * The interface is particularly suited to exposing buffered metrics that are + * captured by DMA from the GPU, unsynchronized with and unrelated to the CPU. + * + * Streams representing a single context are accessible to applications with a + * corresponding drm file descriptor, such that OpenGL can use the interface + * without special privileges. Access to system-wide metrics requires root + * privileges by default, unless changed via the dev.i915.perf_event_paranoid + * sysctl option. + * + */ + +/** + * DOC: i915 Perf History and Comparison with Core Perf + * + * The interface was initially inspired by the core Perf infrastructure but + * some notable differences are: + * + * i915 perf file descriptors represent a "stream" instead of an "event"; where + * a perf event primarily corresponds to a single 64bit value, while a stream + * might sample sets of tightly-coupled counters, depending on the + * configuration. For example the Gen OA unit isn't designed to support + * orthogonal configurations of individual counters; it's configured for a set + * of related counters. Samples for an i915 perf stream capturing OA metrics + * will include a set of counter values packed in a compact HW specific format. + * The OA unit supports a number of different packing formats which can be + * selected by the user opening the stream. Perf has support for grouping + * events, but each event in the group is configured, validated and + * authenticated individually with separate system calls. + * + * i915 perf stream configurations are provided as an array of u64 (key,value) + * pairs, instead of a fixed struct with multiple miscellaneous config members, + * interleaved with event-type specific members. + * + * i915 perf doesn't support exposing metrics via an mmap'd circular buffer. + * The supported metrics are being written to memory by the GPU unsynchronized + * with the CPU, using HW specific packing formats for counter sets. Sometimes + * the constraints on HW configuration require reports to be filtered before it + * would be acceptable to expose them to unprivileged applications - to hide + * the metrics of other processes/contexts. For these use cases a read() based + * interface is a good fit, and provides an opportunity to filter data as it + * gets copied from the GPU mapped buffers to userspace buffers. + * + * + * Issues hit with first prototype based on Core Perf + * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + * + * The first prototype of this driver was based on the core perf + * infrastructure, and while we did make that mostly work, with some changes to + * perf, we found we were breaking or working around too many assumptions baked + * into perf's currently cpu centric design. + * + * In the end we didn't see a clear benefit to making perf's implementation and + * interface more complex by changing design assumptions while we knew we still + * wouldn't be able to use any existing perf based userspace tools. + * + * Also considering the Gen specific nature of the Observability hardware and + * how userspace will sometimes need to combine i915 perf OA metrics with + * side-band OA data captured via MI_REPORT_PERF_COUNT commands; we're + * expecting the interface to be used by a platform specific userspace such as + * OpenGL or tools. This is to say; we aren't inherently missing out on having + * a standard vendor/architecture agnostic interface by not using perf. + * + * + * For posterity, in case we might re-visit trying to adapt core perf to be + * better suited to exposing i915 metrics these were the main pain points we + * hit: + * + * - The perf based OA PMU driver broke some significant design assumptions: + * + * Existing perf pmus are used for profiling work on a cpu and we were + * introducing the idea of _IS_DEVICE pmus with different security + * implications, the need to fake cpu-related data (such as user/kernel + * registers) to fit with perf's current design, and adding _DEVICE records + * as a way to forward device-specific status records. + * + * The OA unit writes reports of counters into a circular buffer, without + * involvement from the CPU, making our PMU driver the first of a kind. + * + * Given the way we were periodically forward data from the GPU-mapped, OA + * buffer to perf's buffer, those bursts of sample writes looked to perf like + * we were sampling too fast and so we had to subvert its throttling checks. + * + * Perf supports groups of counters and allows those to be read via + * transactions internally but transactions currently seem designed to be + * explicitly initiated from the cpu (say in response to a userspace read()) + * and while we could pull a report out of the OA buffer we can't + * trigger a report from the cpu on demand. + * + * Related to being report based; the OA counters are configured in HW as a + * set while perf generally expects counter configurations to be orthogonal. + * Although counters can be associated with a group leader as they are + * opened, there's no clear precedent for being able to provide group-wide + * configuration attributes (for example we want to let userspace choose the + * OA unit report format used to capture all counters in a set, or specify a + * GPU context to filter metrics on). We avoided using perf's grouping + * feature and forwarded OA reports to userspace via perf's 'raw' sample + * field. This suited our userspace well considering how coupled the counters + * are when dealing with normalizing. It would be inconvenient to split + * counters up into separate events, only to require userspace to recombine + * them. For Mesa it's also convenient to be forwarded raw, periodic reports + * for combining with the side-band raw reports it captures using + * MI_REPORT_PERF_COUNT commands. + * + * - As a side note on perf's grouping feature; there was also some concern + * that using PERF_FORMAT_GROUP as a way to pack together counter values + * would quite drastically inflate our sample sizes, which would likely + * lower the effective sampling resolutions we could use when the available + * memory bandwidth is limited. + * + * With the OA unit's report formats, counters are packed together as 32 + * or 40bit values, with the largest report size being 256 bytes. + * + * PERF_FORMAT_GROUP values are 64bit, but there doesn't appear to be a + * documented ordering to the values, implying PERF_FORMAT_ID must also be + * used to add a 64bit ID before each value; giving 16 bytes per counter. + * + * Related to counter orthogonality; we can't time share the OA unit, while + * event scheduling is a central design idea within perf for allowing + * userspace to open + enable more events than can be configured in HW at any + * one time. The OA unit is not designed to allow re-configuration while in + * use. We can't reconfigure the OA unit without losing internal OA unit + * state which we can't access explicitly to save and restore. Reconfiguring + * the OA unit is also relatively slow, involving ~100 register writes. From + * userspace Mesa also depends on a stable OA configuration when emitting + * MI_REPORT_PERF_COUNT commands and importantly the OA unit can't be + * disabled while there are outstanding MI_RPC commands lest we hang the + * command streamer. + * + * The contents of sample records aren't extensible by device drivers (i.e. + * the sample_type bits). As an example; Sourab Gupta had been looking to + * attach GPU timestamps to our OA samples. We were shoehorning OA reports + * into sample records by using the 'raw' field, but it's tricky to pack more + * than one thing into this field because events/core.c currently only lets a + * pmu give a single raw data pointer plus len which will be copied into the + * ring buffer. To include more than the OA report we'd have to copy the + * report into an intermediate larger buffer. I'd been considering allowing a + * vector of data+len values to be specified for copying the raw data, but + * it felt like a kludge to being using the raw field for this purpose. + * + * - It felt like our perf based PMU was making some technical compromises + * just for the sake of using perf: + * + * perf_event_open() requires events to either relate to a pid or a specific + * cpu core, while our device pmu related to neither. Events opened with a + * pid will be automatically enabled/disabled according to the scheduling of + * that process - so not appropriate for us. When an event is related to a + * cpu id, perf ensures pmu methods will be invoked via an inter process + * interrupt on that core. To avoid invasive changes our userspace opened OA + * perf events for a specific cpu. This was workable but it meant the + * majority of the OA driver ran in atomic context, including all OA report + * forwarding, which wasn't really necessary in our case and seems to make + * our locking requirements somewhat complex as we handled the interaction + * with the rest of the i915 driver. + */ + +#include <linux/anon_inodes.h> +#include <linux/sizes.h> +#include <linux/uuid.h> + +#include "gem/i915_gem_context.h" +#include "gem/i915_gem_internal.h" +#include "gt/intel_engine_pm.h" +#include "gt/intel_engine_regs.h" +#include "gt/intel_engine_user.h" +#include "gt/intel_execlists_submission.h" +#include "gt/intel_gpu_commands.h" +#include "gt/intel_gt.h" +#include "gt/intel_gt_clock_utils.h" +#include "gt/intel_gt_regs.h" +#include "gt/intel_lrc.h" +#include "gt/intel_lrc_reg.h" +#include "gt/intel_ring.h" + +#include "i915_drv.h" +#include "i915_file_private.h" +#include "i915_perf.h" +#include "i915_perf_oa_regs.h" + +/* HW requires this to be a power of two, between 128k and 16M, though driver + * is currently generally designed assuming the largest 16M size is used such + * that the overflow cases are unlikely in normal operation. + */ +#define OA_BUFFER_SIZE SZ_16M + +#define OA_TAKEN(tail, head) ((tail - head) & (OA_BUFFER_SIZE - 1)) + +/** + * DOC: OA Tail Pointer Race + * + * There's a HW race condition between OA unit tail pointer register updates and + * writes to memory whereby the tail pointer can sometimes get ahead of what's + * been written out to the OA buffer so far (in terms of what's visible to the + * CPU). + * + * Although this can be observed explicitly while copying reports to userspace + * by checking for a zeroed report-id field in tail reports, we want to account + * for this earlier, as part of the oa_buffer_check_unlocked to avoid lots of + * redundant read() attempts. + * + * We workaround this issue in oa_buffer_check_unlocked() by reading the reports + * in the OA buffer, starting from the tail reported by the HW until we find a + * report with its first 2 dwords not 0 meaning its previous report is + * completely in memory and ready to be read. Those dwords are also set to 0 + * once read and the whole buffer is cleared upon OA buffer initialization. The + * first dword is the reason for this report while the second is the timestamp, + * making the chances of having those 2 fields at 0 fairly unlikely. A more + * detailed explanation is available in oa_buffer_check_unlocked(). + * + * Most of the implementation details for this workaround are in + * oa_buffer_check_unlocked() and _append_oa_reports() + * + * Note for posterity: previously the driver used to define an effective tail + * pointer that lagged the real pointer by a 'tail margin' measured in bytes + * derived from %OA_TAIL_MARGIN_NSEC and the configured sampling frequency. + * This was flawed considering that the OA unit may also automatically generate + * non-periodic reports (such as on context switch) or the OA unit may be + * enabled without any periodic sampling. + */ +#define OA_TAIL_MARGIN_NSEC 100000ULL +#define INVALID_TAIL_PTR 0xffffffff + +/* The default frequency for checking whether the OA unit has written new + * reports to the circular OA buffer... + */ +#define DEFAULT_POLL_FREQUENCY_HZ 200 +#define DEFAULT_POLL_PERIOD_NS (NSEC_PER_SEC / DEFAULT_POLL_FREQUENCY_HZ) + +/* for sysctl proc_dointvec_minmax of dev.i915.perf_stream_paranoid */ +static u32 i915_perf_stream_paranoid = true; + +/* The maximum exponent the hardware accepts is 63 (essentially it selects one + * of the 64bit timestamp bits to trigger reports from) but there's currently + * no known use case for sampling as infrequently as once per 47 thousand years. + * + * Since the timestamps included in OA reports are only 32bits it seems + * reasonable to limit the OA exponent where it's still possible to account for + * overflow in OA report timestamps. + */ +#define OA_EXPONENT_MAX 31 + +#define INVALID_CTX_ID 0xffffffff + +/* On Gen8+ automatically triggered OA reports include a 'reason' field... */ +#define OAREPORT_REASON_MASK 0x3f +#define OAREPORT_REASON_MASK_EXTENDED 0x7f +#define OAREPORT_REASON_SHIFT 19 +#define OAREPORT_REASON_TIMER (1<<0) +#define OAREPORT_REASON_CTX_SWITCH (1<<3) +#define OAREPORT_REASON_CLK_RATIO (1<<5) + + +/* For sysctl proc_dointvec_minmax of i915_oa_max_sample_rate + * + * The highest sampling frequency we can theoretically program the OA unit + * with is always half the timestamp frequency: E.g. 6.25Mhz for Haswell. + * + * Initialized just before we register the sysctl parameter. + */ +static int oa_sample_rate_hard_limit; + +/* Theoretically we can program the OA unit to sample every 160ns but don't + * allow that by default unless root... + * + * The default threshold of 100000Hz is based on perf's similar + * kernel.perf_event_max_sample_rate sysctl parameter. + */ +static u32 i915_oa_max_sample_rate = 100000; + +/* XXX: beware if future OA HW adds new report formats that the current + * code assumes all reports have a power-of-two size and ~(size - 1) can + * be used as a mask to align the OA tail pointer. + */ +static const struct i915_oa_format oa_formats[I915_OA_FORMAT_MAX] = { + [I915_OA_FORMAT_A13] = { 0, 64 }, + [I915_OA_FORMAT_A29] = { 1, 128 }, + [I915_OA_FORMAT_A13_B8_C8] = { 2, 128 }, + /* A29_B8_C8 Disallowed as 192 bytes doesn't factor into buffer size */ + [I915_OA_FORMAT_B4_C8] = { 4, 64 }, + [I915_OA_FORMAT_A45_B8_C8] = { 5, 256 }, + [I915_OA_FORMAT_B4_C8_A16] = { 6, 128 }, + [I915_OA_FORMAT_C4_B8] = { 7, 64 }, + [I915_OA_FORMAT_A12] = { 0, 64 }, + [I915_OA_FORMAT_A12_B8_C8] = { 2, 128 }, + [I915_OA_FORMAT_A32u40_A4u32_B8_C8] = { 5, 256 }, +}; + +#define SAMPLE_OA_REPORT (1<<0) + +/** + * struct perf_open_properties - for validated properties given to open a stream + * @sample_flags: `DRM_I915_PERF_PROP_SAMPLE_*` properties are tracked as flags + * @single_context: Whether a single or all gpu contexts should be monitored + * @hold_preemption: Whether the preemption is disabled for the filtered + * context + * @ctx_handle: A gem ctx handle for use with @single_context + * @metrics_set: An ID for an OA unit metric set advertised via sysfs + * @oa_format: An OA unit HW report format + * @oa_periodic: Whether to enable periodic OA unit sampling + * @oa_period_exponent: The OA unit sampling period is derived from this + * @engine: The engine (typically rcs0) being monitored by the OA unit + * @has_sseu: Whether @sseu was specified by userspace + * @sseu: internal SSEU configuration computed either from the userspace + * specified configuration in the opening parameters or a default value + * (see get_default_sseu_config()) + * @poll_oa_period: The period in nanoseconds at which the CPU will check for OA + * data availability + * + * As read_properties_unlocked() enumerates and validates the properties given + * to open a stream of metrics the configuration is built up in the structure + * which starts out zero initialized. + */ +struct perf_open_properties { + u32 sample_flags; + + u64 single_context:1; + u64 hold_preemption:1; + u64 ctx_handle; + + /* OA sampling state */ + int metrics_set; + int oa_format; + bool oa_periodic; + int oa_period_exponent; + + struct intel_engine_cs *engine; + + bool has_sseu; + struct intel_sseu sseu; + + u64 poll_oa_period; +}; + +struct i915_oa_config_bo { + struct llist_node node; + + struct i915_oa_config *oa_config; + struct i915_vma *vma; +}; + +static struct ctl_table_header *sysctl_header; + +static enum hrtimer_restart oa_poll_check_timer_cb(struct hrtimer *hrtimer); + +void i915_oa_config_release(struct kref *ref) +{ + struct i915_oa_config *oa_config = + container_of(ref, typeof(*oa_config), ref); + + kfree(oa_config->flex_regs); + kfree(oa_config->b_counter_regs); + kfree(oa_config->mux_regs); + + kfree_rcu(oa_config, rcu); +} + +struct i915_oa_config * +i915_perf_get_oa_config(struct i915_perf *perf, int metrics_set) +{ + struct i915_oa_config *oa_config; + + rcu_read_lock(); + oa_config = idr_find(&perf->metrics_idr, metrics_set); + if (oa_config) + oa_config = i915_oa_config_get(oa_config); + rcu_read_unlock(); + + return oa_config; +} + +static void free_oa_config_bo(struct i915_oa_config_bo *oa_bo) +{ + i915_oa_config_put(oa_bo->oa_config); + i915_vma_put(oa_bo->vma); + kfree(oa_bo); +} + +static u32 gen12_oa_hw_tail_read(struct i915_perf_stream *stream) +{ + struct intel_uncore *uncore = stream->uncore; + + return intel_uncore_read(uncore, GEN12_OAG_OATAILPTR) & + GEN12_OAG_OATAILPTR_MASK; +} + +static u32 gen8_oa_hw_tail_read(struct i915_perf_stream *stream) +{ + struct intel_uncore *uncore = stream->uncore; + + return intel_uncore_read(uncore, GEN8_OATAILPTR) & GEN8_OATAILPTR_MASK; +} + +static u32 gen7_oa_hw_tail_read(struct i915_perf_stream *stream) +{ + struct intel_uncore *uncore = stream->uncore; + u32 oastatus1 = intel_uncore_read(uncore, GEN7_OASTATUS1); + + return oastatus1 & GEN7_OASTATUS1_TAIL_MASK; +} + +/** + * oa_buffer_check_unlocked - check for data and update tail ptr state + * @stream: i915 stream instance + * + * This is either called via fops (for blocking reads in user ctx) or the poll + * check hrtimer (atomic ctx) to check the OA buffer tail pointer and check + * if there is data available for userspace to read. + * + * This function is central to providing a workaround for the OA unit tail + * pointer having a race with respect to what data is visible to the CPU. + * It is responsible for reading tail pointers from the hardware and giving + * the pointers time to 'age' before they are made available for reading. + * (See description of OA_TAIL_MARGIN_NSEC above for further details.) + * + * Besides returning true when there is data available to read() this function + * also updates the tail, aging_tail and aging_timestamp in the oa_buffer + * object. + * + * Note: It's safe to read OA config state here unlocked, assuming that this is + * only called while the stream is enabled, while the global OA configuration + * can't be modified. + * + * Returns: %true if the OA buffer contains data, else %false + */ +static bool oa_buffer_check_unlocked(struct i915_perf_stream *stream) +{ + u32 gtt_offset = i915_ggtt_offset(stream->oa_buffer.vma); + int report_size = stream->oa_buffer.format_size; + unsigned long flags; + bool pollin; + u32 hw_tail; + u64 now; + + /* We have to consider the (unlikely) possibility that read() errors + * could result in an OA buffer reset which might reset the head and + * tail state. + */ + spin_lock_irqsave(&stream->oa_buffer.ptr_lock, flags); + + hw_tail = stream->perf->ops.oa_hw_tail_read(stream); + + /* The tail pointer increases in 64 byte increments, + * not in report_size steps... + */ + hw_tail &= ~(report_size - 1); + + now = ktime_get_mono_fast_ns(); + + if (hw_tail == stream->oa_buffer.aging_tail && + (now - stream->oa_buffer.aging_timestamp) > OA_TAIL_MARGIN_NSEC) { + /* If the HW tail hasn't move since the last check and the HW + * tail has been aging for long enough, declare it the new + * tail. + */ + stream->oa_buffer.tail = stream->oa_buffer.aging_tail; + } else { + u32 head, tail, aged_tail; + + /* NB: The head we observe here might effectively be a little + * out of date. If a read() is in progress, the head could be + * anywhere between this head and stream->oa_buffer.tail. + */ + head = stream->oa_buffer.head - gtt_offset; + aged_tail = stream->oa_buffer.tail - gtt_offset; + + hw_tail -= gtt_offset; + tail = hw_tail; + + /* Walk the stream backward until we find a report with dword 0 + * & 1 not at 0. Since the circular buffer pointers progress by + * increments of 64 bytes and that reports can be up to 256 + * bytes long, we can't tell whether a report has fully landed + * in memory before the first 2 dwords of the following report + * have effectively landed. + * + * This is assuming that the writes of the OA unit land in + * memory in the order they were written to. + * If not : (╯°□°）╯︵ ┻━┻ + */ + while (OA_TAKEN(tail, aged_tail) >= report_size) { + u32 *report32 = (void *)(stream->oa_buffer.vaddr + tail); + + if (report32[0] != 0 || report32[1] != 0) + break; + + tail = (tail - report_size) & (OA_BUFFER_SIZE - 1); + } + + if (OA_TAKEN(hw_tail, tail) > report_size && + __ratelimit(&stream->perf->tail_pointer_race)) + DRM_NOTE("unlanded report(s) head=0x%x " + "tail=0x%x hw_tail=0x%x\n", + head, tail, hw_tail); + + stream->oa_buffer.tail = gtt_offset + tail; + stream->oa_buffer.aging_tail = gtt_offset + hw_tail; + stream->oa_buffer.aging_timestamp = now; + } + + pollin = OA_TAKEN(stream->oa_buffer.tail - gtt_offset, + stream->oa_buffer.head - gtt_offset) >= report_size; + + spin_unlock_irqrestore(&stream->oa_buffer.ptr_lock, flags); + + return pollin; +} + +/** + * append_oa_status - Appends a status record to a userspace read() buffer. + * @stream: An i915-perf stream opened for OA metrics + * @buf: destination buffer given by userspace + * @count: the number of bytes userspace wants to read + * @offset: (inout): the current position for writing into @buf + * @type: The kind of status to report to userspace + * + * Writes a status record (such as `DRM_I915_PERF_RECORD_OA_REPORT_LOST`) + * into the userspace read() buffer. + * + * The @buf @offset will only be updated on success. + * + * Returns: 0 on success, negative error code on failure. + */ +static int append_oa_status(struct i915_perf_stream *stream, + char __user *buf, + size_t count, + size_t *offset, + enum drm_i915_perf_record_type type) +{ + struct drm_i915_perf_record_header header = { type, 0, sizeof(header) }; + + if ((count - *offset) < header.size) + return -ENOSPC; + + if (copy_to_user(buf + *offset, &header, sizeof(header))) + return -EFAULT; + + (*offset) += header.size; + + return 0; +} + +/** + * append_oa_sample - Copies single OA report into userspace read() buffer. + * @stream: An i915-perf stream opened for OA metrics + * @buf: destination buffer given by userspace + * @count: the number of bytes userspace wants to read + * @offset: (inout): the current position for writing into @buf + * @report: A single OA report to (optionally) include as part of the sample + * + * The contents of a sample are configured through `DRM_I915_PERF_PROP_SAMPLE_*` + * properties when opening a stream, tracked as `stream->sample_flags`. This + * function copies the requested components of a single sample to the given + * read() @buf. + * + * The @buf @offset will only be updated on success. + * + * Returns: 0 on success, negative error code on failure. + */ +static int append_oa_sample(struct i915_perf_stream *stream, + char __user *buf, + size_t count, + size_t *offset, + const u8 *report) +{ + int report_size = stream->oa_buffer.format_size; + struct drm_i915_perf_record_header header; + + header.type = DRM_I915_PERF_RECORD_SAMPLE; + header.pad = 0; + header.size = stream->sample_size; + + if ((count - *offset) < header.size) + return -ENOSPC; + + buf += *offset; + if (copy_to_user(buf, &header, sizeof(header))) + return -EFAULT; + buf += sizeof(header); + + if (copy_to_user(buf, report, report_size)) + return -EFAULT; + + (*offset) += header.size; + + return 0; +} + +/** + * gen8_append_oa_reports - Copies all buffered OA reports into + * userspace read() buffer. + * @stream: An i915-perf stream opened for OA metrics + * @buf: destination buffer given by userspace + * @count: the number of bytes userspace wants to read + * @offset: (inout): the current position for writing into @buf + * + * Notably any error condition resulting in a short read (-%ENOSPC or + * -%EFAULT) will be returned even though one or more records may + * have been successfully copied. In this case it's up to the caller + * to decide if the error should be squashed before returning to + * userspace. + * + * Note: reports are consumed from the head, and appended to the + * tail, so the tail chases the head?... If you think that's mad + * and back-to-front you're not alone, but this follows the + * Gen PRM naming convention. + * + * Returns: 0 on success, negative error code on failure. + */ +static int gen8_append_oa_reports(struct i915_perf_stream *stream, + char __user *buf, + size_t count, + size_t *offset) +{ + struct intel_uncore *uncore = stream->uncore; + int report_size = stream->oa_buffer.format_size; + u8 *oa_buf_base = stream->oa_buffer.vaddr; + u32 gtt_offset = i915_ggtt_offset(stream->oa_buffer.vma); + u32 mask = (OA_BUFFER_SIZE - 1); + size_t start_offset = *offset; + unsigned long flags; + u32 head, tail; + u32 taken; + int ret = 0; + + if (drm_WARN_ON(&uncore->i915->drm, !stream->enabled)) + return -EIO; + + spin_lock_irqsave(&stream->oa_buffer.ptr_lock, flags); + + head = stream->oa_buffer.head; + tail = stream->oa_buffer.tail; + + spin_unlock_irqrestore(&stream->oa_buffer.ptr_lock, flags); + + /* + * NB: oa_buffer.head/tail include the gtt_offset which we don't want + * while indexing relative to oa_buf_base. + */ + head -= gtt_offset; + tail -= gtt_offset; + + /* + * An out of bounds or misaligned head or tail pointer implies a driver + * bug since we validate + align the tail pointers we read from the + * hardware and we are in full control of the head pointer which should + * only be incremented by multiples of the report size (notably also + * all a power of two). + */ + if (drm_WARN_ONCE(&uncore->i915->drm, + head > OA_BUFFER_SIZE || head % report_size || + tail > OA_BUFFER_SIZE || tail % report_size, + "Inconsistent OA buffer pointers: head = %u, tail = %u\n", + head, tail)) + return -EIO; + + + for (/* none */; + (taken = OA_TAKEN(tail, head)); + head = (head + report_size) & mask) { + u8 *report = oa_buf_base + head; + u32 *report32 = (void *)report; + u32 ctx_id; + u32 reason; + + /* + * All the report sizes factor neatly into the buffer + * size so we never expect to see a report split + * between the beginning and end of the buffer. + * + * Given the initial alignment check a misalignment + * here would imply a driver bug that would result + * in an overrun. + */ + if (drm_WARN_ON(&uncore->i915->drm, + (OA_BUFFER_SIZE - head) < report_size)) { + drm_err(&uncore->i915->drm, + "Spurious OA head ptr: non-integral report offset\n"); + break; + } + + /* + * The reason field includes flags identifying what + * triggered this specific report (mostly timer + * triggered or e.g. due to a context switch). + * + * This field is never expected to be zero so we can + * check that the report isn't invalid before copying + * it to userspace... + */ + reason = ((report32[0] >> OAREPORT_REASON_SHIFT) & + (GRAPHICS_VER(stream->perf->i915) == 12 ? + OAREPORT_REASON_MASK_EXTENDED : + OAREPORT_REASON_MASK)); + + ctx_id = report32[2] & stream->specific_ctx_id_mask; + + /* + * Squash whatever is in the CTX_ID field if it's marked as + * invalid to be sure we avoid false-positive, single-context + * filtering below... + * + * Note: that we don't clear the valid_ctx_bit so userspace can + * understand that the ID has been squashed by the kernel. + */ + if (!(report32[0] & stream->perf->gen8_valid_ctx_bit) && + GRAPHICS_VER(stream->perf->i915) <= 11) + ctx_id = report32[2] = INVALID_CTX_ID; + + /* + * NB: For Gen 8 the OA unit no longer supports clock gating + * off for a specific context and the kernel can't securely + * stop the counters from updating as system-wide / global + * values. + * + * Automatic reports now include a context ID so reports can be + * filtered on the cpu but it's not worth trying to + * automatically subtract/hide counter progress for other + * contexts while filtering since we can't stop userspace + * issuing MI_REPORT_PERF_COUNT commands which would still + * provide a side-band view of the real values. + * + * To allow userspace (such as Mesa/GL_INTEL_performance_query) + * to normalize counters for a single filtered context then it + * needs be forwarded bookend context-switch reports so that it + * can track switches in between MI_REPORT_PERF_COUNT commands + * and can itself subtract/ignore the progress of counters + * associated with other contexts. Note that the hardware + * automatically triggers reports when switching to a new + * context which are tagged with the ID of the newly active + * context. To avoid the complexity (and likely fragility) of + * reading ahead while parsing reports to try and minimize + * forwarding redundant context switch reports (i.e. between + * other, unrelated contexts) we simply elect to forward them + * all. + * + * We don't rely solely on the reason field to identify context + * switches since it's not-uncommon for periodic samples to + * identify a switch before any 'context switch' report. + */ + if (!stream->perf->exclusive_stream->ctx || + stream->specific_ctx_id == ctx_id || + stream->oa_buffer.last_ctx_id == stream->specific_ctx_id || + reason & OAREPORT_REASON_CTX_SWITCH) { + + /* + * While filtering for a single context we avoid + * leaking the IDs of other contexts. + */ + if (stream->perf->exclusive_stream->ctx && + stream->specific_ctx_id != ctx_id) { + report32[2] = INVALID_CTX_ID; + } + + ret = append_oa_sample(stream, buf, count, offset, + report); + if (ret) + break; + + stream->oa_buffer.last_ctx_id = ctx_id; + } + + /* + * Clear out the first 2 dword as a mean to detect unlanded + * reports. + */ + report32[0] = 0; + report32[1] = 0; + } + + if (start_offset != *offset) { + i915_reg_t oaheadptr; + + oaheadptr = GRAPHICS_VER(stream->perf->i915) == 12 ? + GEN12_OAG_OAHEADPTR : GEN8_OAHEADPTR; + + spin_lock_irqsave(&stream->oa_buffer.ptr_lock, flags); + + /* + * We removed the gtt_offset for the copy loop above, indexing + * relative to oa_buf_base so put back here... + */ + head += gtt_offset; + intel_uncore_write(uncore, oaheadptr, + head & GEN12_OAG_OAHEADPTR_MASK); + stream->oa_buffer.head = head; + + spin_unlock_irqrestore(&stream->oa_buffer.ptr_lock, flags); + } + + return ret; +} + +/** + * gen8_oa_read - copy status records then buffered OA reports + * @stream: An i915-perf stream opened for OA metrics + * @buf: destination buffer given by userspace + * @count: the number of bytes userspace wants to read + * @offset: (inout): the current position for writing into @buf + * + * Checks OA unit status registers and if necessary appends corresponding + * status records for userspace (such as for a buffer full condition) and then + * initiate appending any buffered OA reports. + * + * Updates @offset according to the number of bytes successfully copied into + * the userspace buffer. + * + * NB: some data may be successfully copied to the userspace buffer + * even if an error is returned, and this is reflected in the + * updated @offset. + * + * Returns: zero on success or a negative error code + */ +static int gen8_oa_read(struct i915_perf_stream *stream, + char __user *buf, + size_t count, + size_t *offset) +{ + struct intel_uncore *uncore = stream->uncore; + u32 oastatus; + i915_reg_t oastatus_reg; + int ret; + + if (drm_WARN_ON(&uncore->i915->drm, !stream->oa_buffer.vaddr)) + return -EIO; + + oastatus_reg = GRAPHICS_VER(stream->perf->i915) == 12 ? + GEN12_OAG_OASTATUS : GEN8_OASTATUS; + + oastatus = intel_uncore_read(uncore, oastatus_reg); + + /* + * We treat OABUFFER_OVERFLOW as a significant error: + * + * Although theoretically we could handle this more gracefully + * sometimes, some Gens don't correctly suppress certain + * automatically triggered reports in this condition and so we + * have to assume that old reports are now being trampled + * over. + * + * Considering how we don't currently give userspace control + * over the OA buffer size and always configure a large 16MB + * buffer, then a buffer overflow does anyway likely indicate + * that something has gone quite badly wrong. + */ + if (oastatus & GEN8_OASTATUS_OABUFFER_OVERFLOW) { + ret = append_oa_status(stream, buf, count, offset, + DRM_I915_PERF_RECORD_OA_BUFFER_LOST); + if (ret) + return ret; + + drm_dbg(&stream->perf->i915->drm, + "OA buffer overflow (exponent = %d): force restart\n", + stream->period_exponent); + + stream->perf->ops.oa_disable(stream); + stream->perf->ops.oa_enable(stream); + + /* + * Note: .oa_enable() is expected to re-init the oabuffer and + * reset GEN8_OASTATUS for us + */ + oastatus = intel_uncore_read(uncore, oastatus_reg); + } + + if (oastatus & GEN8_OASTATUS_REPORT_LOST) { + ret = append_oa_status(stream, buf, count, offset, + DRM_I915_PERF_RECORD_OA_REPORT_LOST); + if (ret) + return ret; + + intel_uncore_rmw(uncore, oastatus_reg, + GEN8_OASTATUS_COUNTER_OVERFLOW | + GEN8_OASTATUS_REPORT_LOST, + IS_GRAPHICS_VER(uncore->i915, 8, 11) ? + (GEN8_OASTATUS_HEAD_POINTER_WRAP | + GEN8_OASTATUS_TAIL_POINTER_WRAP) : 0); + } + + return gen8_append_oa_reports(stream, buf, count, offset); +} + +/** + * gen7_append_oa_reports - Copies all buffered OA reports into + * userspace read() buffer. + * @stream: An i915-perf stream opened for OA metrics + * @buf: destination buffer given by userspace + * @count: the number of bytes userspace wants to read + * @offset: (inout): the current position for writing into @buf + * + * Notably any error condition resulting in a short read (-%ENOSPC or + * -%EFAULT) will be returned even though one or more records may + * have been successfully copied. In this case it's up to the caller + * to decide if the error should be squashed before returning to + * userspace. + * + * Note: reports are consumed from the head, and appended to the + * tail, so the tail chases the head?... If you think that's mad + * and back-to-front you're not alone, but this follows the + * Gen PRM naming convention. + * + * Returns: 0 on success, negative error code on failure. + */ +static int gen7_append_oa_reports(struct i915_perf_stream *stream, + char __user *buf, + size_t count, + size_t *offset) +{ + struct intel_uncore *uncore = stream->uncore; + int report_size = stream->oa_buffer.format_size; + u8 *oa_buf_base = stream->oa_buffer.vaddr; + u32 gtt_offset = i915_ggtt_offset(stream->oa_buffer.vma); + u32 mask = (OA_BUFFER_SIZE - 1); + size_t start_offset = *offset; + unsigned long flags; + u32 head, tail; + u32 taken; + int ret = 0; + + if (drm_WARN_ON(&uncore->i915->drm, !stream->enabled)) + return -EIO; + + spin_lock_irqsave(&stream->oa_buffer.ptr_lock, flags); + + head = stream->oa_buffer.head; + tail = stream->oa_buffer.tail; + + spin_unlock_irqrestore(&stream->oa_buffer.ptr_lock, flags); + + /* NB: oa_buffer.head/tail include the gtt_offset which we don't want + * while indexing relative to oa_buf_base. + */ + head -= gtt_offset; + tail -= gtt_offset; + + /* An out of bounds or misaligned head or tail pointer implies a driver + * bug since we validate + align the tail pointers we read from the + * hardware and we are in full control of the head pointer which should + * only be incremented by multiples of the report size (notably also + * all a power of two). + */ + if (drm_WARN_ONCE(&uncore->i915->drm, + head > OA_BUFFER_SIZE || head % report_size || + tail > OA_BUFFER_SIZE || tail % report_size, + "Inconsistent OA buffer pointers: head = %u, tail = %u\n", + head, tail)) + return -EIO; + + + for (/* none */; + (taken = OA_TAKEN(tail, head)); + head = (head + report_size) & mask) { + u8 *report = oa_buf_base + head; + u32 *report32 = (void *)report; + + /* All the report sizes factor neatly into the buffer + * size so we never expect to see a report split + * between the beginning and end of the buffer. + * + * Given the initial alignment check a misalignment + * here would imply a driver bug that would result + * in an overrun. + */ + if (drm_WARN_ON(&uncore->i915->drm, + (OA_BUFFER_SIZE - head) < report_size)) { + drm_err(&uncore->i915->drm, + "Spurious OA head ptr: non-integral report offset\n"); + break; + } + + /* The report-ID field for periodic samples includes + * some undocumented flags related to what triggered + * the report and is never expected to be zero so we + * can check that the report isn't invalid before + * copying it to userspace... + */ + if (report32[0] == 0) { + if (__ratelimit(&stream->perf->spurious_report_rs)) + DRM_NOTE("Skipping spurious, invalid OA report\n"); + continue; + } + + ret = append_oa_sample(stream, buf, count, offset, report); + if (ret) + break; + + /* Clear out the first 2 dwords as a mean to detect unlanded + * reports. + */ + report32[0] = 0; + report32[1] = 0; + } + + if (start_offset != *offset) { + spin_lock_irqsave(&stream->oa_buffer.ptr_lock, flags); + + /* We removed the gtt_offset for the copy loop above, indexing + * relative to oa_buf_base so put back here... + */ + head += gtt_offset; + + intel_uncore_write(uncore, GEN7_OASTATUS2, + (head & GEN7_OASTATUS2_HEAD_MASK) | + GEN7_OASTATUS2_MEM_SELECT_GGTT); + stream->oa_buffer.head = head; + + spin_unlock_irqrestore(&stream->oa_buffer.ptr_lock, flags); + } + + return ret; +} + +/** + * gen7_oa_read - copy status records then buffered OA reports + * @stream: An i915-perf stream opened for OA metrics + * @buf: destination buffer given by userspace + * @count: the number of bytes userspace wants to read + * @offset: (inout): the current position for writing into @buf + * + * Checks Gen 7 specific OA unit status registers and if necessary appends + * corresponding status records for userspace (such as for a buffer full + * condition) and then initiate appending any buffered OA reports. + * + * Updates @offset according to the number of bytes successfully copied into + * the userspace buffer. + * + * Returns: zero on success or a negative error code + */ +static int gen7_oa_read(struct i915_perf_stream *stream, + char __user *buf, + size_t count, + size_t *offset) +{ + struct intel_uncore *uncore = stream->uncore; + u32 oastatus1; + int ret; + + if (drm_WARN_ON(&uncore->i915->drm, !stream->oa_buffer.vaddr)) + return -EIO; + + oastatus1 = intel_uncore_read(uncore, GEN7_OASTATUS1); + + /* XXX: On Haswell we don't have a safe way to clear oastatus1 + * bits while the OA unit is enabled (while the tail pointer + * may be updated asynchronously) so we ignore status bits + * that have already been reported to userspace. + */ + oastatus1 &= ~stream->perf->gen7_latched_oastatus1; + + /* We treat OABUFFER_OVERFLOW as a significant error: + * + * - The status can be interpreted to mean that the buffer is + * currently full (with a higher precedence than OA_TAKEN() + * which will start to report a near-empty buffer after an + * overflow) but it's awkward that we can't clear the status + * on Haswell, so without a reset we won't be able to catch + * the state again. + * + * - Since it also implies the HW has started overwriting old + * reports it may also affect our sanity checks for invalid + * reports when copying to userspace that assume new reports + * are being written to cleared memory. + * + * - In the future we may want to introduce a flight recorder + * mode where the driver will automatically maintain a safe + * guard band between head/tail, avoiding this overflow + * condition, but we avoid the added driver complexity for + * now. + */ + if (unlikely(oastatus1 & GEN7_OASTATUS1_OABUFFER_OVERFLOW)) { + ret = append_oa_status(stream, buf, count, offset, + DRM_I915_PERF_RECORD_OA_BUFFER_LOST); + if (ret) + return ret; + + drm_dbg(&stream->perf->i915->drm, + "OA buffer overflow (exponent = %d): force restart\n", + stream->period_exponent); + + stream->perf->ops.oa_disable(stream); + stream->perf->ops.oa_enable(stream); + + oastatus1 = intel_uncore_read(uncore, GEN7_OASTATUS1); + } + + if (unlikely(oastatus1 & GEN7_OASTATUS1_REPORT_LOST)) { + ret = append_oa_status(stream, buf, count, offset, + DRM_I915_PERF_RECORD_OA_REPORT_LOST); + if (ret) + return ret; + stream->perf->gen7_latched_oastatus1 |= + GEN7_OASTATUS1_REPORT_LOST; + } + + return gen7_append_oa_reports(stream, buf, count, offset); +} + +/** + * i915_oa_wait_unlocked - handles blocking IO until OA data available + * @stream: An i915-perf stream opened for OA metrics + * + * Called when userspace tries to read() from a blocking stream FD opened + * for OA metrics. It waits until the hrtimer callback finds a non-empty + * OA buffer and wakes us. + * + * Note: it's acceptable to have this return with some false positives + * since any subsequent read handling will return -EAGAIN if there isn't + * really data ready for userspace yet. + * + * Returns: zero on success or a negative error code + */ +static int i915_oa_wait_unlocked(struct i915_perf_stream *stream) +{ + /* We would wait indefinitely if periodic sampling is not enabled */ + if (!stream->periodic) + return -EIO; + + return wait_event_interruptible(stream->poll_wq, + oa_buffer_check_unlocked(stream)); +} + +/** + * i915_oa_poll_wait - call poll_wait() for an OA stream poll() + * @stream: An i915-perf stream opened for OA metrics + * @file: An i915 perf stream file + * @wait: poll() state table + * + * For handling userspace polling on an i915 perf stream opened for OA metrics, + * this starts a poll_wait with the wait queue that our hrtimer callback wakes + * when it sees data ready to read in the circular OA buffer. + */ +static void i915_oa_poll_wait(struct i915_perf_stream *stream, + struct file *file, + poll_table *wait) +{ + poll_wait(file, &stream->poll_wq, wait); +} + +/** + * i915_oa_read - just calls through to &i915_oa_ops->read + * @stream: An i915-perf stream opened for OA metrics + * @buf: destination buffer given by userspace + * @count: the number of bytes userspace wants to read + * @offset: (inout): the current position for writing into @buf + * + * Updates @offset according to the number of bytes successfully copied into + * the userspace buffer. + * + * Returns: zero on success or a negative error code + */ +static int i915_oa_read(struct i915_perf_stream *stream, + char __user *buf, + size_t count, + size_t *offset) +{ + return stream->perf->ops.read(stream, buf, count, offset); +} + +static struct intel_context *oa_pin_context(struct i915_perf_stream *stream) +{ + struct i915_gem_engines_iter it; + struct i915_gem_context *ctx = stream->ctx; + struct intel_context *ce; + struct i915_gem_ww_ctx ww; + int err = -ENODEV; + + for_each_gem_engine(ce, i915_gem_context_lock_engines(ctx), it) { + if (ce->engine != stream->engine) /* first match! */ + continue; + + err = 0; + break; + } + i915_gem_context_unlock_engines(ctx); + + if (err) + return ERR_PTR(err); + + i915_gem_ww_ctx_init(&ww, true); +retry: + /* + * As the ID is the gtt offset of the context's vma we + * pin the vma to ensure the ID remains fixed. + */ + err = intel_context_pin_ww(ce, &ww); + if (err == -EDEADLK) { + err = i915_gem_ww_ctx_backoff(&ww); + if (!err) + goto retry; + } + i915_gem_ww_ctx_fini(&ww); + + if (err) + return ERR_PTR(err); + + stream->pinned_ctx = ce; + return stream->pinned_ctx; +} + +/** + * oa_get_render_ctx_id - determine and hold ctx hw id + * @stream: An i915-perf stream opened for OA metrics + * + * Determine the render context hw id, and ensure it remains fixed for the + * lifetime of the stream. This ensures that we don't have to worry about + * updating the context ID in OACONTROL on the fly. + * + * Returns: zero on success or a negative error code + */ +static int oa_get_render_ctx_id(struct i915_perf_stream *stream) +{ + struct intel_context *ce; + + ce = oa_pin_context(stream); + if (IS_ERR(ce)) + return PTR_ERR(ce); + + switch (GRAPHICS_VER(ce->engine->i915)) { + case 7: { + /* + * On Haswell we don't do any post processing of the reports + * and don't need to use the mask. + */ + stream->specific_ctx_id = i915_ggtt_offset(ce->state); + stream->specific_ctx_id_mask = 0; + break; + } + + case 8: + case 9: + if (intel_engine_uses_guc(ce->engine)) { + /* + * When using GuC, the context descriptor we write in + * i915 is read by GuC and rewritten before it's + * actually written into the hardware. The LRCA is + * what is put into the context id field of the + * context descriptor by GuC. Because it's aligned to + * a page, the lower 12bits are always at 0 and + * dropped by GuC. They won't be part of the context + * ID in the OA reports, so squash those lower bits. + */ + stream->specific_ctx_id = ce->lrc.lrca >> 12; + + /* + * GuC uses the top bit to signal proxy submission, so + * ignore that bit. + */ + stream->specific_ctx_id_mask = + (1U << (GEN8_CTX_ID_WIDTH - 1)) - 1; + } else { + stream->specific_ctx_id_mask = + (1U << GEN8_CTX_ID_WIDTH) - 1; + stream->specific_ctx_id = stream->specific_ctx_id_mask; + } + break; + + case 11: + case 12: + if (GRAPHICS_VER_FULL(ce->engine->i915) >= IP_VER(12, 50)) { + stream->specific_ctx_id_mask = + ((1U << XEHP_SW_CTX_ID_WIDTH) - 1) << + (XEHP_SW_CTX_ID_SHIFT - 32); + stream->specific_ctx_id = + (XEHP_MAX_CONTEXT_HW_ID - 1) << + (XEHP_SW_CTX_ID_SHIFT - 32); + } else { + stream->specific_ctx_id_mask = + ((1U << GEN11_SW_CTX_ID_WIDTH) - 1) << (GEN11_SW_CTX_ID_SHIFT - 32); + /* + * Pick an unused context id + * 0 - BITS_PER_LONG are used by other contexts + * GEN12_MAX_CONTEXT_HW_ID (0x7ff) is used by idle context + */ + stream->specific_ctx_id = + (GEN12_MAX_CONTEXT_HW_ID - 1) << (GEN11_SW_CTX_ID_SHIFT - 32); + } + break; + + default: + MISSING_CASE(GRAPHICS_VER(ce->engine->i915)); + } + + ce->tag = stream->specific_ctx_id; + + drm_dbg(&stream->perf->i915->drm, + "filtering on ctx_id=0x%x ctx_id_mask=0x%x\n", + stream->specific_ctx_id, + stream->specific_ctx_id_mask); + + return 0; +} + +/** + * oa_put_render_ctx_id - counterpart to oa_get_render_ctx_id releases hold + * @stream: An i915-perf stream opened for OA metrics + * + * In case anything needed doing to ensure the context HW ID would remain valid + * for the lifetime of the stream, then that can be undone here. + */ +static void oa_put_render_ctx_id(struct i915_perf_stream *stream) +{ + struct intel_context *ce; + + ce = fetch_and_zero(&stream->pinned_ctx); + if (ce) { + ce->tag = 0; /* recomputed on next submission after parking */ + intel_context_unpin(ce); + } + + stream->specific_ctx_id = INVALID_CTX_ID; + stream->specific_ctx_id_mask = 0; +} + +static void +free_oa_buffer(struct i915_perf_stream *stream) +{ + i915_vma_unpin_and_release(&stream->oa_buffer.vma, + I915_VMA_RELEASE_MAP); + + stream->oa_buffer.vaddr = NULL; +} + +static void +free_oa_configs(struct i915_perf_stream *stream) +{ + struct i915_oa_config_bo *oa_bo, *tmp; + + i915_oa_config_put(stream->oa_config); + llist_for_each_entry_safe(oa_bo, tmp, stream->oa_config_bos.first, node) + free_oa_config_bo(oa_bo); +} + +static void +free_noa_wait(struct i915_perf_stream *stream) +{ + i915_vma_unpin_and_release(&stream->noa_wait, 0); +} + +static void i915_oa_stream_destroy(struct i915_perf_stream *stream) +{ + struct i915_perf *perf = stream->perf; + + if (WARN_ON(stream != perf->exclusive_stream)) + return; + + /* + * Unset exclusive_stream first, it will be checked while disabling + * the metric set on gen8+. + * + * See i915_oa_init_reg_state() and lrc_configure_all_contexts() + */ + WRITE_ONCE(perf->exclusive_stream, NULL); + perf->ops.disable_metric_set(stream); + + free_oa_buffer(stream); + + intel_uncore_forcewake_put(stream->uncore, FORCEWAKE_ALL); + intel_engine_pm_put(stream->engine); + + if (stream->ctx) + oa_put_render_ctx_id(stream); + + free_oa_configs(stream); + free_noa_wait(stream); + + if (perf->spurious_report_rs.missed) { + DRM_NOTE("%d spurious OA report notices suppressed due to ratelimiting\n", + perf->spurious_report_rs.missed); + } +} + +static void gen7_init_oa_buffer(struct i915_perf_stream *stream) +{ + struct intel_uncore *uncore = stream->uncore; + u32 gtt_offset = i915_ggtt_offset(stream->oa_buffer.vma); + unsigned long flags; + + spin_lock_irqsave(&stream->oa_buffer.ptr_lock, flags); + + /* Pre-DevBDW: OABUFFER must be set with counters off, + * before OASTATUS1, but after OASTATUS2 + */ + intel_uncore_write(uncore, GEN7_OASTATUS2, /* head */ + gtt_offset | GEN7_OASTATUS2_MEM_SELECT_GGTT); + stream->oa_buffer.head = gtt_offset; + + intel_uncore_write(uncore, GEN7_OABUFFER, gtt_offset); + + intel_uncore_write(uncore, GEN7_OASTATUS1, /* tail */ + gtt_offset | OABUFFER_SIZE_16M); + + /* Mark that we need updated tail pointers to read from... */ + stream->oa_buffer.aging_tail = INVALID_TAIL_PTR; + stream->oa_buffer.tail = gtt_offset; + + spin_unlock_irqrestore(&stream->oa_buffer.ptr_lock, flags); + + /* On Haswell we have to track which OASTATUS1 flags we've + * already seen since they can't be cleared while periodic + * sampling is enabled. + */ + stream->perf->gen7_latched_oastatus1 = 0; + + /* NB: although the OA buffer will initially be allocated + * zeroed via shmfs (and so this memset is redundant when + * first allocating), we may re-init the OA buffer, either + * when re-enabling a stream or in error/reset paths. + * + * The reason we clear the buffer for each re-init is for the + * sanity check in gen7_append_oa_reports() that looks at the + * report-id field to make sure it's non-zero which relies on + * the assumption that new reports are being written to zeroed + * memory... + */ + memset(stream->oa_buffer.vaddr, 0, OA_BUFFER_SIZE); +} + +static void gen8_init_oa_buffer(struct i915_perf_stream *stream) +{ + struct intel_uncore *uncore = stream->uncore; + u32 gtt_offset = i915_ggtt_offset(stream->oa_buffer.vma); + unsigned long flags; + + spin_lock_irqsave(&stream->oa_buffer.ptr_lock, flags); + + intel_uncore_write(uncore, GEN8_OASTATUS, 0); + intel_uncore_write(uncore, GEN8_OAHEADPTR, gtt_offset); + stream->oa_buffer.head = gtt_offset; + + intel_uncore_write(uncore, GEN8_OABUFFER_UDW, 0); + + /* + * PRM says: + * + * "This MMIO must be set before the OATAILPTR + * register and after the OAHEADPTR register. This is + * to enable proper functionality of the overflow + * bit." + */ + intel_uncore_write(uncore, GEN8_OABUFFER, gtt_offset | + OABUFFER_SIZE_16M | GEN8_OABUFFER_MEM_SELECT_GGTT); + intel_uncore_write(uncore, GEN8_OATAILPTR, gtt_offset & GEN8_OATAILPTR_MASK); + + /* Mark that we need updated tail pointers to read from... */ + stream->oa_buffer.aging_tail = INVALID_TAIL_PTR; + stream->oa_buffer.tail = gtt_offset; + + /* + * Reset state used to recognise context switches, affecting which + * reports we will forward to userspace while filtering for a single + * context. + */ + stream->oa_buffer.last_ctx_id = INVALID_CTX_ID; + + spin_unlock_irqrestore(&stream->oa_buffer.ptr_lock, flags); + + /* + * NB: although the OA buffer will initially be allocated + * zeroed via shmfs (and so this memset is redundant when + * first allocating), we may re-init the OA buffer, either + * when re-enabling a stream or in error/reset paths. + * + * The reason we clear the buffer for each re-init is for the + * sanity check in gen8_append_oa_reports() that looks at the + * reason field to make sure it's non-zero which relies on + * the assumption that new reports are being written to zeroed + * memory... + */ + memset(stream->oa_buffer.vaddr, 0, OA_BUFFER_SIZE); +} + +static void gen12_init_oa_buffer(struct i915_perf_stream *stream) +{ + struct intel_uncore *uncore = stream->uncore; + u32 gtt_offset = i915_ggtt_offset(stream->oa_buffer.vma); + unsigned long flags; + + spin_lock_irqsave(&stream->oa_buffer.ptr_lock, flags); + + intel_uncore_write(uncore, GEN12_OAG_OASTATUS, 0); + intel_uncore_write(uncore, GEN12_OAG_OAHEADPTR, + gtt_offset & GEN12_OAG_OAHEADPTR_MASK); + stream->oa_buffer.head = gtt_offset; + + /* + * PRM says: + * + * "This MMIO must be set before the OATAILPTR + * register and after the OAHEADPTR register. This is + * to enable proper functionality of the overflow + * bit." + */ + intel_uncore_write(uncore, GEN12_OAG_OABUFFER, gtt_offset | + OABUFFER_SIZE_16M | GEN8_OABUFFER_MEM_SELECT_GGTT); + intel_uncore_write(uncore, GEN12_OAG_OATAILPTR, + gtt_offset & GEN12_OAG_OATAILPTR_MASK); + + /* Mark that we need updated tail pointers to read from... */ + stream->oa_buffer.aging_tail = INVALID_TAIL_PTR; + stream->oa_buffer.tail = gtt_offset; + + /* + * Reset state used to recognise context switches, affecting which + * reports we will forward to userspace while filtering for a single + * context. + */ + stream->oa_buffer.last_ctx_id = INVALID_CTX_ID; + + spin_unlock_irqrestore(&stream->oa_buffer.ptr_lock, flags); + + /* + * NB: although the OA buffer will initially be allocated + * zeroed via shmfs (and so this memset is redundant when + * first allocating), we may re-init the OA buffer, either + * when re-enabling a stream or in error/reset paths. + * + * The reason we clear the buffer for each re-init is for the + * sanity check in gen8_append_oa_reports() that looks at the + * reason field to make sure it's non-zero which relies on + * the assumption that new reports are being written to zeroed + * memory... + */ + memset(stream->oa_buffer.vaddr, 0, + stream->oa_buffer.vma->size); +} + +static int alloc_oa_buffer(struct i915_perf_stream *stream) +{ + struct drm_i915_private *i915 = stream->perf->i915; + struct drm_i915_gem_object *bo; + struct i915_vma *vma; + int ret; + + if (drm_WARN_ON(&i915->drm, stream->oa_buffer.vma)) + return -ENODEV; + + BUILD_BUG_ON_NOT_POWER_OF_2(OA_BUFFER_SIZE); + BUILD_BUG_ON(OA_BUFFER_SIZE < SZ_128K || OA_BUFFER_SIZE > SZ_16M); + + bo = i915_gem_object_create_shmem(stream->perf->i915, OA_BUFFER_SIZE); + if (IS_ERR(bo)) { + drm_err(&i915->drm, "Failed to allocate OA buffer\n"); + return PTR_ERR(bo); + } + + i915_gem_object_set_cache_coherency(bo, I915_CACHE_LLC); + + /* PreHSW required 512K alignment, HSW requires 16M */ + vma = i915_gem_object_ggtt_pin(bo, NULL, 0, SZ_16M, 0); + if (IS_ERR(vma)) { + ret = PTR_ERR(vma); + goto err_unref; + } + stream->oa_buffer.vma = vma; + + stream->oa_buffer.vaddr = + i915_gem_object_pin_map_unlocked(bo, I915_MAP_WB); + if (IS_ERR(stream->oa_buffer.vaddr)) { + ret = PTR_ERR(stream->oa_buffer.vaddr); + goto err_unpin; + } + + return 0; + +err_unpin: + __i915_vma_unpin(vma); + +err_unref: + i915_gem_object_put(bo); + + stream->oa_buffer.vaddr = NULL; + stream->oa_buffer.vma = NULL; + + return ret; +} + +static u32 *save_restore_register(struct i915_perf_stream *stream, u32 *cs, + bool save, i915_reg_t reg, u32 offset, + u32 dword_count) +{ + u32 cmd; + u32 d; + + cmd = save ? MI_STORE_REGISTER_MEM : MI_LOAD_REGISTER_MEM; + cmd |= MI_SRM_LRM_GLOBAL_GTT; + if (GRAPHICS_VER(stream->perf->i915) >= 8) + cmd++; + + for (d = 0; d < dword_count; d++) { + *cs++ = cmd; + *cs++ = i915_mmio_reg_offset(reg) + 4 * d; + *cs++ = intel_gt_scratch_offset(stream->engine->gt, + offset) + 4 * d; + *cs++ = 0; + } + + return cs; +} + +static int alloc_noa_wait(struct i915_perf_stream *stream) +{ + struct drm_i915_private *i915 = stream->perf->i915; + struct drm_i915_gem_object *bo; + struct i915_vma *vma; + const u64 delay_ticks = 0xffffffffffffffff - + intel_gt_ns_to_clock_interval(to_gt(stream->perf->i915), + atomic64_read(&stream->perf->noa_programming_delay)); + const u32 base = stream->engine->mmio_base; +#define CS_GPR(x) GEN8_RING_CS_GPR(base, x) + u32 *batch, *ts0, *cs, *jump; + struct i915_gem_ww_ctx ww; + int ret, i; + enum { + START_TS, + NOW_TS, + DELTA_TS, + JUMP_PREDICATE, + DELTA_TARGET, + N_CS_GPR + }; + + bo = i915_gem_object_create_internal(i915, 4096); + if (IS_ERR(bo)) { + drm_err(&i915->drm, + "Failed to allocate NOA wait batchbuffer\n"); + return PTR_ERR(bo); + } + + i915_gem_ww_ctx_init(&ww, true); +retry: + ret = i915_gem_object_lock(bo, &ww); + if (ret) + goto out_ww; + + /* + * We pin in GGTT because we jump into this buffer now because + * multiple OA config BOs will have a jump to this address and it + * needs to be fixed during the lifetime of the i915/perf stream. + */ + vma = i915_gem_object_ggtt_pin_ww(bo, &ww, NULL, 0, 0, PIN_HIGH); + if (IS_ERR(vma)) { + ret = PTR_ERR(vma); + goto out_ww; + } + + batch = cs = i915_gem_object_pin_map(bo, I915_MAP_WB); + if (IS_ERR(batch)) { + ret = PTR_ERR(batch); + goto err_unpin; + } + + /* Save registers. */ + for (i = 0; i < N_CS_GPR; i++) + cs = save_restore_register( + stream, cs, true /* save */, CS_GPR(i), + INTEL_GT_SCRATCH_FIELD_PERF_CS_GPR + 8 * i, 2); + cs = save_restore_register( + stream, cs, true /* save */, MI_PREDICATE_RESULT_1(RENDER_RING_BASE), + INTEL_GT_SCRATCH_FIELD_PERF_PREDICATE_RESULT_1, 1); + + /* First timestamp snapshot location. */ + ts0 = cs; + + /* + * Initial snapshot of the timestamp register to implement the wait. + * We work with 32b values, so clear out the top 32b bits of the + * register because the ALU works 64bits. + */ + *cs++ = MI_LOAD_REGISTER_IMM(1); + *cs++ = i915_mmio_reg_offset(CS_GPR(START_TS)) + 4; + *cs++ = 0; + *cs++ = MI_LOAD_REGISTER_REG | (3 - 2); + *cs++ = i915_mmio_reg_offset(RING_TIMESTAMP(base)); + *cs++ = i915_mmio_reg_offset(CS_GPR(START_TS)); + + /* + * This is the location we're going to jump back into until the + * required amount of time has passed. + */ + jump = cs; + + /* + * Take another snapshot of the timestamp register. Take care to clear + * up the top 32bits of CS_GPR(1) as we're using it for other + * operations below. + */ + *cs++ = MI_LOAD_REGISTER_IMM(1); + *cs++ = i915_mmio_reg_offset(CS_GPR(NOW_TS)) + 4; + *cs++ = 0; + *cs++ = MI_LOAD_REGISTER_REG | (3 - 2); + *cs++ = i915_mmio_reg_offset(RING_TIMESTAMP(base)); + *cs++ = i915_mmio_reg_offset(CS_GPR(NOW_TS)); + + /* + * Do a diff between the 2 timestamps and store the result back into + * CS_GPR(1). + */ + *cs++ = MI_MATH(5); + *cs++ = MI_MATH_LOAD(MI_MATH_REG_SRCA, MI_MATH_REG(NOW_TS)); + *cs++ = MI_MATH_LOAD(MI_MATH_REG_SRCB, MI_MATH_REG(START_TS)); + *cs++ = MI_MATH_SUB; + *cs++ = MI_MATH_STORE(MI_MATH_REG(DELTA_TS), MI_MATH_REG_ACCU); + *cs++ = MI_MATH_STORE(MI_MATH_REG(JUMP_PREDICATE), MI_MATH_REG_CF); + + /* + * Transfer the carry flag (set to 1 if ts1 < ts0, meaning the + * timestamp have rolled over the 32bits) into the predicate register + * to be used for the predicated jump. + */ + *cs++ = MI_LOAD_REGISTER_REG | (3 - 2); + *cs++ = i915_mmio_reg_offset(CS_GPR(JUMP_PREDICATE)); + *cs++ = i915_mmio_reg_offset(MI_PREDICATE_RESULT_1(RENDER_RING_BASE)); + + /* Restart from the beginning if we had timestamps roll over. */ + *cs++ = (GRAPHICS_VER(i915) < 8 ? + MI_BATCH_BUFFER_START : + MI_BATCH_BUFFER_START_GEN8) | + MI_BATCH_PREDICATE; + *cs++ = i915_ggtt_offset(vma) + (ts0 - batch) * 4; + *cs++ = 0; + + /* + * Now add the diff between to previous timestamps and add it to : + * (((1 * << 64) - 1) - delay_ns) + * + * When the Carry Flag contains 1 this means the elapsed time is + * longer than the expected delay, and we can exit the wait loop. + */ + *cs++ = MI_LOAD_REGISTER_IMM(2); + *cs++ = i915_mmio_reg_offset(CS_GPR(DELTA_TARGET)); + *cs++ = lower_32_bits(delay_ticks); + *cs++ = i915_mmio_reg_offset(CS_GPR(DELTA_TARGET)) + 4; + *cs++ = upper_32_bits(delay_ticks); + + *cs++ = MI_MATH(4); + *cs++ = MI_MATH_LOAD(MI_MATH_REG_SRCA, MI_MATH_REG(DELTA_TS)); + *cs++ = MI_MATH_LOAD(MI_MATH_REG_SRCB, MI_MATH_REG(DELTA_TARGET)); + *cs++ = MI_MATH_ADD; + *cs++ = MI_MATH_STOREINV(MI_MATH_REG(JUMP_PREDICATE), MI_MATH_REG_CF); + + *cs++ = MI_ARB_CHECK; + + /* + * Transfer the result into the predicate register to be used for the + * predicated jump. + */ + *cs++ = MI_LOAD_REGISTER_REG | (3 - 2); + *cs++ = i915_mmio_reg_offset(CS_GPR(JUMP_PREDICATE)); + *cs++ = i915_mmio_reg_offset(MI_PREDICATE_RESULT_1(RENDER_RING_BASE)); + + /* Predicate the jump. */ + *cs++ = (GRAPHICS_VER(i915) < 8 ? + MI_BATCH_BUFFER_START : + MI_BATCH_BUFFER_START_GEN8) | + MI_BATCH_PREDICATE; + *cs++ = i915_ggtt_offset(vma) + (jump - batch) * 4; + *cs++ = 0; + + /* Restore registers. */ + for (i = 0; i < N_CS_GPR; i++) + cs = save_restore_register( + stream, cs, false /* restore */, CS_GPR(i), + INTEL_GT_SCRATCH_FIELD_PERF_CS_GPR + 8 * i, 2); + cs = save_restore_register( + stream, cs, false /* restore */, MI_PREDICATE_RESULT_1(RENDER_RING_BASE), + INTEL_GT_SCRATCH_FIELD_PERF_PREDICATE_RESULT_1, 1); + + /* And return to the ring. */ + *cs++ = MI_BATCH_BUFFER_END; + + GEM_BUG_ON(cs - batch > PAGE_SIZE / sizeof(*batch)); + + i915_gem_object_flush_map(bo); + __i915_gem_object_release_map(bo); + + stream->noa_wait = vma; + goto out_ww; + +err_unpin: + i915_vma_unpin_and_release(&vma, 0); +out_ww: + if (ret == -EDEADLK) { + ret = i915_gem_ww_ctx_backoff(&ww); + if (!ret) + goto retry; + } + i915_gem_ww_ctx_fini(&ww); + if (ret) + i915_gem_object_put(bo); + return ret; +} + +static u32 *write_cs_mi_lri(u32 *cs, + const struct i915_oa_reg *reg_data, + u32 n_regs) +{ + u32 i; + + for (i = 0; i < n_regs; i++) { + if ((i % MI_LOAD_REGISTER_IMM_MAX_REGS) == 0) { + u32 n_lri = min_t(u32, + n_regs - i, + MI_LOAD_REGISTER_IMM_MAX_REGS); + + *cs++ = MI_LOAD_REGISTER_IMM(n_lri); + } + *cs++ = i915_mmio_reg_offset(reg_data[i].addr); + *cs++ = reg_data[i].value; + } + + return cs; +} + +static int num_lri_dwords(int num_regs) +{ + int count = 0; + + if (num_regs > 0) { + count += DIV_ROUND_UP(num_regs, MI_LOAD_REGISTER_IMM_MAX_REGS); + count += num_regs * 2; + } + + return count; +} + +static struct i915_oa_config_bo * +alloc_oa_config_buffer(struct i915_perf_stream *stream, + struct i915_oa_config *oa_config) +{ + struct drm_i915_gem_object *obj; + struct i915_oa_config_bo *oa_bo; + struct i915_gem_ww_ctx ww; + size_t config_length = 0; + u32 *cs; + int err; + + oa_bo = kzalloc(sizeof(*oa_bo), GFP_KERNEL); + if (!oa_bo) + return ERR_PTR(-ENOMEM); + + config_length += num_lri_dwords(oa_config->mux_regs_len); + config_length += num_lri_dwords(oa_config->b_counter_regs_len); + config_length += num_lri_dwords(oa_config->flex_regs_len); + config_length += 3; /* MI_BATCH_BUFFER_START */ + config_length = ALIGN(sizeof(u32) * config_length, I915_GTT_PAGE_SIZE); + + obj = i915_gem_object_create_shmem(stream->perf->i915, config_length); + if (IS_ERR(obj)) { + err = PTR_ERR(obj); + goto err_free; + } + + i915_gem_ww_ctx_init(&ww, true); +retry: + err = i915_gem_object_lock(obj, &ww); + if (err) + goto out_ww; + + cs = i915_gem_object_pin_map(obj, I915_MAP_WB); + if (IS_ERR(cs)) { + err = PTR_ERR(cs); + goto out_ww; + } + + cs = write_cs_mi_lri(cs, + oa_config->mux_regs, + oa_config->mux_regs_len); + cs = write_cs_mi_lri(cs, + oa_config->b_counter_regs, + oa_config->b_counter_regs_len); + cs = write_cs_mi_lri(cs, + oa_config->flex_regs, + oa_config->flex_regs_len); + + /* Jump into the active wait. */ + *cs++ = (GRAPHICS_VER(stream->perf->i915) < 8 ? + MI_BATCH_BUFFER_START : + MI_BATCH_BUFFER_START_GEN8); + *cs++ = i915_ggtt_offset(stream->noa_wait); + *cs++ = 0; + + i915_gem_object_flush_map(obj); + __i915_gem_object_release_map(obj); + + oa_bo->vma = i915_vma_instance(obj, + &stream->engine->gt->ggtt->vm, + NULL); + if (IS_ERR(oa_bo->vma)) { + err = PTR_ERR(oa_bo->vma); + goto out_ww; + } + + oa_bo->oa_config = i915_oa_config_get(oa_config); + llist_add(&oa_bo->node, &stream->oa_config_bos); + +out_ww: + if (err == -EDEADLK) { + err = i915_gem_ww_ctx_backoff(&ww); + if (!err) + goto retry; + } + i915_gem_ww_ctx_fini(&ww); + + if (err) + i915_gem_object_put(obj); +err_free: + if (err) { + kfree(oa_bo); + return ERR_PTR(err); + } + return oa_bo; +} + +static struct i915_vma * +get_oa_vma(struct i915_perf_stream *stream, struct i915_oa_config *oa_config) +{ + struct i915_oa_config_bo *oa_bo; + + /* + * Look for the buffer in the already allocated BOs attached + * to the stream. + */ + llist_for_each_entry(oa_bo, stream->oa_config_bos.first, node) { + if (oa_bo->oa_config == oa_config && + memcmp(oa_bo->oa_config->uuid, + oa_config->uuid, + sizeof(oa_config->uuid)) == 0) + goto out; + } + + oa_bo = alloc_oa_config_buffer(stream, oa_config); + if (IS_ERR(oa_bo)) + return ERR_CAST(oa_bo); + +out: + return i915_vma_get(oa_bo->vma); +} + +static int +emit_oa_config(struct i915_perf_stream *stream, + struct i915_oa_config *oa_config, + struct intel_context *ce, + struct i915_active *active) +{ + struct i915_request *rq; + struct i915_vma *vma; + struct i915_gem_ww_ctx ww; + int err; + + vma = get_oa_vma(stream, oa_config); + if (IS_ERR(vma)) + return PTR_ERR(vma); + + i915_gem_ww_ctx_init(&ww, true); +retry: + err = i915_gem_object_lock(vma->obj, &ww); + if (err) + goto err; + + err = i915_vma_pin_ww(vma, &ww, 0, 0, PIN_GLOBAL | PIN_HIGH); + if (err) + goto err; + + intel_engine_pm_get(ce->engine); + rq = i915_request_create(ce); + intel_engine_pm_put(ce->engine); + if (IS_ERR(rq)) { + err = PTR_ERR(rq); + goto err_vma_unpin; + } + + if (!IS_ERR_OR_NULL(active)) { + /* After all individual context modifications */ + err = i915_request_await_active(rq, active, + I915_ACTIVE_AWAIT_ACTIVE); + if (err) + goto err_add_request; + + err = i915_active_add_request(active, rq); + if (err) + goto err_add_request; + } + + err = i915_request_await_object(rq, vma->obj, 0); + if (!err) + err = i915_vma_move_to_active(vma, rq, 0); + if (err) + goto err_add_request; + + err = rq->engine->emit_bb_start(rq, + vma->node.start, 0, + I915_DISPATCH_SECURE); + if (err) + goto err_add_request; + +err_add_request: + i915_request_add(rq); +err_vma_unpin: + i915_vma_unpin(vma); +err: + if (err == -EDEADLK) { + err = i915_gem_ww_ctx_backoff(&ww); + if (!err) + goto retry; + } + + i915_gem_ww_ctx_fini(&ww); + i915_vma_put(vma); + return err; +} + +static struct intel_context *oa_context(struct i915_perf_stream *stream) +{ + return stream->pinned_ctx ?: stream->engine->kernel_context; +} + +static int +hsw_enable_metric_set(struct i915_perf_stream *stream, + struct i915_active *active) +{ + struct intel_uncore *uncore = stream->uncore; + + /* + * PRM: + * + * OA unit is using “crclk” for its functionality. When trunk + * level clock gating takes place, OA clock would be gated, + * unable to count the events from non-render clock domain. + * Render clock gating must be disabled when OA is enabled to + * count the events from non-render domain. Unit level clock + * gating for RCS should also be disabled. + */ + intel_uncore_rmw(uncore, GEN7_MISCCPCTL, + GEN7_DOP_CLOCK_GATE_ENABLE, 0); + intel_uncore_rmw(uncore, GEN6_UCGCTL1, + 0, GEN6_CSUNIT_CLOCK_GATE_DISABLE); + + return emit_oa_config(stream, + stream->oa_config, oa_context(stream), + active); +} + +static void hsw_disable_metric_set(struct i915_perf_stream *stream) +{ + struct intel_uncore *uncore = stream->uncore; + + intel_uncore_rmw(uncore, GEN6_UCGCTL1, + GEN6_CSUNIT_CLOCK_GATE_DISABLE, 0); + intel_uncore_rmw(uncore, GEN7_MISCCPCTL, + 0, GEN7_DOP_CLOCK_GATE_ENABLE); + + intel_uncore_rmw(uncore, GDT_CHICKEN_BITS, GT_NOA_ENABLE, 0); +} + +static u32 oa_config_flex_reg(const struct i915_oa_config *oa_config, + i915_reg_t reg) +{ + u32 mmio = i915_mmio_reg_offset(reg); + int i; + + /* + * This arbitrary default will select the 'EU FPU0 Pipeline + * Active' event. In the future it's anticipated that there + * will be an explicit 'No Event' we can select, but not yet... + */ + if (!oa_config) + return 0; + + for (i = 0; i < oa_config->flex_regs_len; i++) { + if (i915_mmio_reg_offset(oa_config->flex_regs[i].addr) == mmio) + return oa_config->flex_regs[i].value; + } + + return 0; +} +/* + * NB: It must always remain pointer safe to run this even if the OA unit + * has been disabled. + * + * It's fine to put out-of-date values into these per-context registers + * in the case that the OA unit has been disabled. + */ +static void +gen8_update_reg_state_unlocked(const struct intel_context *ce, + const struct i915_perf_stream *stream) +{ + u32 ctx_oactxctrl = stream->perf->ctx_oactxctrl_offset; + u32 ctx_flexeu0 = stream->perf->ctx_flexeu0_offset; + /* The MMIO offsets for Flex EU registers aren't contiguous */ + static const i915_reg_t flex_regs[] = { + EU_PERF_CNTL0, + EU_PERF_CNTL1, + EU_PERF_CNTL2, + EU_PERF_CNTL3, + EU_PERF_CNTL4, + EU_PERF_CNTL5, + EU_PERF_CNTL6, + }; + u32 *reg_state = ce->lrc_reg_state; + int i; + + reg_state[ctx_oactxctrl + 1] = + (stream->period_exponent << GEN8_OA_TIMER_PERIOD_SHIFT) | + (stream->periodic ? GEN8_OA_TIMER_ENABLE : 0) | + GEN8_OA_COUNTER_RESUME; + + for (i = 0; i < ARRAY_SIZE(flex_regs); i++) + reg_state[ctx_flexeu0 + i * 2 + 1] = + oa_config_flex_reg(stream->oa_config, flex_regs[i]); +} + +struct flex { + i915_reg_t reg; + u32 offset; + u32 value; +}; + +static int +gen8_store_flex(struct i915_request *rq, + struct intel_context *ce, + const struct flex *flex, unsigned int count) +{ + u32 offset; + u32 *cs; + + cs = intel_ring_begin(rq, 4 * count); + if (IS_ERR(cs)) + return PTR_ERR(cs); + + offset = i915_ggtt_offset(ce->state) + LRC_STATE_OFFSET; + do { + *cs++ = MI_STORE_DWORD_IMM_GEN4 | MI_USE_GGTT; + *cs++ = offset + flex->offset * sizeof(u32); + *cs++ = 0; + *cs++ = flex->value; + } while (flex++, --count); + + intel_ring_advance(rq, cs); + + return 0; +} + +static int +gen8_load_flex(struct i915_request *rq, + struct intel_context *ce, + const struct flex *flex, unsigned int count) +{ + u32 *cs; + + GEM_BUG_ON(!count || count > 63); + + cs = intel_ring_begin(rq, 2 * count + 2); + if (IS_ERR(cs)) + return PTR_ERR(cs); + + *cs++ = MI_LOAD_REGISTER_IMM(count); + do { + *cs++ = i915_mmio_reg_offset(flex->reg); + *cs++ = flex->value; + } while (flex++, --count); + *cs++ = MI_NOOP; + + intel_ring_advance(rq, cs); + + return 0; +} + +static int gen8_modify_context(struct intel_context *ce, + const struct flex *flex, unsigned int count) +{ + struct i915_request *rq; + int err; + + rq = intel_engine_create_kernel_request(ce->engine); + if (IS_ERR(rq)) + return PTR_ERR(rq); + + /* Serialise with the remote context */ + err = intel_context_prepare_remote_request(ce, rq); + if (err == 0) + err = gen8_store_flex(rq, ce, flex, count); + + i915_request_add(rq); + return err; +} + +static int +gen8_modify_self(struct intel_context *ce, + const struct flex *flex, unsigned int count, + struct i915_active *active) +{ + struct i915_request *rq; + int err; + + intel_engine_pm_get(ce->engine); + rq = i915_request_create(ce); + intel_engine_pm_put(ce->engine); + if (IS_ERR(rq)) + return PTR_ERR(rq); + + if (!IS_ERR_OR_NULL(active)) { + err = i915_active_add_request(active, rq); + if (err) + goto err_add_request; + } + + err = gen8_load_flex(rq, ce, flex, count); + if (err) + goto err_add_request; + +err_add_request: + i915_request_add(rq); + return err; +} + +static int gen8_configure_context(struct i915_gem_context *ctx, + struct flex *flex, unsigned int count) +{ + struct i915_gem_engines_iter it; + struct intel_context *ce; + int err = 0; + + for_each_gem_engine(ce, i915_gem_context_lock_engines(ctx), it) { + GEM_BUG_ON(ce == ce->engine->kernel_context); + + if (ce->engine->class != RENDER_CLASS) + continue; + + /* Otherwise OA settings will be set upon first use */ + if (!intel_context_pin_if_active(ce)) + continue; + + flex->value = intel_sseu_make_rpcs(ce->engine->gt, &ce->sseu); + err = gen8_modify_context(ce, flex, count); + + intel_context_unpin(ce); + if (err) + break; + } + i915_gem_context_unlock_engines(ctx); + + return err; +} + +static int gen12_configure_oar_context(struct i915_perf_stream *stream, + struct i915_active *active) +{ + int err; + struct intel_context *ce = stream->pinned_ctx; + u32 format = stream->oa_buffer.format; + struct flex regs_context[] = { + { + GEN8_OACTXCONTROL, + stream->perf->ctx_oactxctrl_offset + 1, + active ? GEN8_OA_COUNTER_RESUME : 0, + }, + }; + /* Offsets in regs_lri are not used since this configuration is only + * applied using LRI. Initialize the correct offsets for posterity. + */ +#define GEN12_OAR_OACONTROL_OFFSET 0x5B0 + struct flex regs_lri[] = { + { + GEN12_OAR_OACONTROL, + GEN12_OAR_OACONTROL_OFFSET + 1, + (format << GEN12_OAR_OACONTROL_COUNTER_FORMAT_SHIFT) | + (active ? GEN12_OAR_OACONTROL_COUNTER_ENABLE : 0) + }, + { + RING_CONTEXT_CONTROL(ce->engine->mmio_base), + CTX_CONTEXT_CONTROL, + _MASKED_FIELD(GEN12_CTX_CTRL_OAR_CONTEXT_ENABLE, + active ? + GEN12_CTX_CTRL_OAR_CONTEXT_ENABLE : + 0) + }, + }; + + /* Modify the context image of pinned context with regs_context*/ + err = intel_context_lock_pinned(ce); + if (err) + return err; + + err = gen8_modify_context(ce, regs_context, ARRAY_SIZE(regs_context)); + intel_context_unlock_pinned(ce); + if (err) + return err; + + /* Apply regs_lri using LRI with pinned context */ + return gen8_modify_self(ce, regs_lri, ARRAY_SIZE(regs_lri), active); +} + +/* + * Manages updating the per-context aspects of the OA stream + * configuration across all contexts. + * + * The awkward consideration here is that OACTXCONTROL controls the + * exponent for periodic sampling which is primarily used for system + * wide profiling where we'd like a consistent sampling period even in + * the face of context switches. + * + * Our approach of updating the register state context (as opposed to + * say using a workaround batch buffer) ensures that the hardware + * won't automatically reload an out-of-date timer exponent even + * transiently before a WA BB could be parsed. + * + * This function needs to: + * - Ensure the currently running context's per-context OA state is + * updated + * - Ensure that all existing contexts will have the correct per-context + * OA state if they are scheduled for use. + * - Ensure any new contexts will be initialized with the correct + * per-context OA state. + * + * Note: it's only the RCS/Render context that has any OA state. + * Note: the first flex register passed must always be R_PWR_CLK_STATE + */ +static int +oa_configure_all_contexts(struct i915_perf_stream *stream, + struct flex *regs, + size_t num_regs, + struct i915_active *active) +{ + struct drm_i915_private *i915 = stream->perf->i915; + struct intel_engine_cs *engine; + struct i915_gem_context *ctx, *cn; + int err; + + lockdep_assert_held(&stream->perf->lock); + + /* + * The OA register config is setup through the context image. This image + * might be written to by the GPU on context switch (in particular on + * lite-restore). This means we can't safely update a context's image, + * if this context is scheduled/submitted to run on the GPU. + * + * We could emit the OA register config through the batch buffer but + * this might leave small interval of time where the OA unit is + * configured at an invalid sampling period. + * + * Note that since we emit all requests from a single ring, there + * is still an implicit global barrier here that may cause a high + * priority context to wait for an otherwise independent low priority + * context. Contexts idle at the time of reconfiguration are not + * trapped behind the barrier. + */ + spin_lock(&i915->gem.contexts.lock); + list_for_each_entry_safe(ctx, cn, &i915->gem.contexts.list, link) { + if (!kref_get_unless_zero(&ctx->ref)) + continue; + + spin_unlock(&i915->gem.contexts.lock); + + err = gen8_configure_context(ctx, regs, num_regs); + if (err) { + i915_gem_context_put(ctx); + return err; + } + + spin_lock(&i915->gem.contexts.lock); + list_safe_reset_next(ctx, cn, link); + i915_gem_context_put(ctx); + } + spin_unlock(&i915->gem.contexts.lock); + + /* + * After updating all other contexts, we need to modify ourselves. + * If we don't modify the kernel_context, we do not get events while + * idle. + */ + for_each_uabi_engine(engine, i915) { + struct intel_context *ce = engine->kernel_context; + + if (engine->class != RENDER_CLASS) + continue; + + regs[0].value = intel_sseu_make_rpcs(engine->gt, &ce->sseu); + + err = gen8_modify_self(ce, regs, num_regs, active); + if (err) + return err; + } + + return 0; +} + +static int +gen12_configure_all_contexts(struct i915_perf_stream *stream, + const struct i915_oa_config *oa_config, + struct i915_active *active) +{ + struct flex regs[] = { + { + GEN8_R_PWR_CLK_STATE(RENDER_RING_BASE), + CTX_R_PWR_CLK_STATE, + }, + }; + + return oa_configure_all_contexts(stream, + regs, ARRAY_SIZE(regs), + active); +} + +static int +lrc_configure_all_contexts(struct i915_perf_stream *stream, + const struct i915_oa_config *oa_config, + struct i915_active *active) +{ + /* The MMIO offsets for Flex EU registers aren't contiguous */ + const u32 ctx_flexeu0 = stream->perf->ctx_flexeu0_offset; +#define ctx_flexeuN(N) (ctx_flexeu0 + 2 * (N) + 1) + struct flex regs[] = { + { + GEN8_R_PWR_CLK_STATE(RENDER_RING_BASE), + CTX_R_PWR_CLK_STATE, + }, + { + GEN8_OACTXCONTROL, + stream->perf->ctx_oactxctrl_offset + 1, + }, + { EU_PERF_CNTL0, ctx_flexeuN(0) }, + { EU_PERF_CNTL1, ctx_flexeuN(1) }, + { EU_PERF_CNTL2, ctx_flexeuN(2) }, + { EU_PERF_CNTL3, ctx_flexeuN(3) }, + { EU_PERF_CNTL4, ctx_flexeuN(4) }, + { EU_PERF_CNTL5, ctx_flexeuN(5) }, + { EU_PERF_CNTL6, ctx_flexeuN(6) }, + }; +#undef ctx_flexeuN + int i; + + regs[1].value = + (stream->period_exponent << GEN8_OA_TIMER_PERIOD_SHIFT) | + (stream->periodic ? GEN8_OA_TIMER_ENABLE : 0) | + GEN8_OA_COUNTER_RESUME; + + for (i = 2; i < ARRAY_SIZE(regs); i++) + regs[i].value = oa_config_flex_reg(oa_config, regs[i].reg); + + return oa_configure_all_contexts(stream, + regs, ARRAY_SIZE(regs), + active); +} + +static int +gen8_enable_metric_set(struct i915_perf_stream *stream, + struct i915_active *active) +{ + struct intel_uncore *uncore = stream->uncore; + struct i915_oa_config *oa_config = stream->oa_config; + int ret; + + /* + * We disable slice/unslice clock ratio change reports on SKL since + * they are too noisy. The HW generates a lot of redundant reports + * where the ratio hasn't really changed causing a lot of redundant + * work to processes and increasing the chances we'll hit buffer + * overruns. + * + * Although we don't currently use the 'disable overrun' OABUFFER + * feature it's worth noting that clock ratio reports have to be + * disabled before considering to use that feature since the HW doesn't + * correctly block these reports. + * + * Currently none of the high-level metrics we have depend on knowing + * this ratio to normalize. + * + * Note: This register is not power context saved and restored, but + * that's OK considering that we disable RC6 while the OA unit is + * enabled. + * + * The _INCLUDE_CLK_RATIO bit allows the slice/unslice frequency to + * be read back from automatically triggered reports, as part of the + * RPT_ID field. + */ + if (IS_GRAPHICS_VER(stream->perf->i915, 9, 11)) { + intel_uncore_write(uncore, GEN8_OA_DEBUG, + _MASKED_BIT_ENABLE(GEN9_OA_DEBUG_DISABLE_CLK_RATIO_REPORTS | + GEN9_OA_DEBUG_INCLUDE_CLK_RATIO)); + } + + /* + * Update all contexts prior writing the mux configurations as we need + * to make sure all slices/subslices are ON before writing to NOA + * registers. + */ + ret = lrc_configure_all_contexts(stream, oa_config, active); + if (ret) + return ret; + + return emit_oa_config(stream, + stream->oa_config, oa_context(stream), + active); +} + +static u32 oag_report_ctx_switches(const struct i915_perf_stream *stream) +{ + return _MASKED_FIELD(GEN12_OAG_OA_DEBUG_DISABLE_CTX_SWITCH_REPORTS, + (stream->sample_flags & SAMPLE_OA_REPORT) ? + 0 : GEN12_OAG_OA_DEBUG_DISABLE_CTX_SWITCH_REPORTS); +} + +static int +gen12_enable_metric_set(struct i915_perf_stream *stream, + struct i915_active *active) +{ + struct intel_uncore *uncore = stream->uncore; + struct i915_oa_config *oa_config = stream->oa_config; + bool periodic = stream->periodic; + u32 period_exponent = stream->period_exponent; + int ret; + + intel_uncore_write(uncore, GEN12_OAG_OA_DEBUG, + /* Disable clk ratio reports, like previous Gens. */ + _MASKED_BIT_ENABLE(GEN12_OAG_OA_DEBUG_DISABLE_CLK_RATIO_REPORTS | + GEN12_OAG_OA_DEBUG_INCLUDE_CLK_RATIO) | + /* + * If the user didn't require OA reports, instruct + * the hardware not to emit ctx switch reports. + */ + oag_report_ctx_switches(stream)); + + intel_uncore_write(uncore, GEN12_OAG_OAGLBCTXCTRL, periodic ? + (GEN12_OAG_OAGLBCTXCTRL_COUNTER_RESUME | + GEN12_OAG_OAGLBCTXCTRL_TIMER_ENABLE | + (period_exponent << GEN12_OAG_OAGLBCTXCTRL_TIMER_PERIOD_SHIFT)) + : 0); + + /* + * Update all contexts prior writing the mux configurations as we need + * to make sure all slices/subslices are ON before writing to NOA + * registers. + */ + ret = gen12_configure_all_contexts(stream, oa_config, active); + if (ret) + return ret; + + /* + * For Gen12, performance counters are context + * saved/restored. Only enable it for the context that + * requested this. + */ + if (stream->ctx) { + ret = gen12_configure_oar_context(stream, active); + if (ret) + return ret; + } + + return emit_oa_config(stream, + stream->oa_config, oa_context(stream), + active); +} + +static void gen8_disable_metric_set(struct i915_perf_stream *stream) +{ + struct intel_uncore *uncore = stream->uncore; + + /* Reset all contexts' slices/subslices configurations. */ + lrc_configure_all_contexts(stream, NULL, NULL); + + intel_uncore_rmw(uncore, GDT_CHICKEN_BITS, GT_NOA_ENABLE, 0); +} + +static void gen11_disable_metric_set(struct i915_perf_stream *stream) +{ + struct intel_uncore *uncore = stream->uncore; + + /* Reset all contexts' slices/subslices configurations. */ + lrc_configure_all_contexts(stream, NULL, NULL); + + /* Make sure we disable noa to save power. */ + intel_uncore_rmw(uncore, RPM_CONFIG1, GEN10_GT_NOA_ENABLE, 0); +} + +static void gen12_disable_metric_set(struct i915_perf_stream *stream) +{ + struct intel_uncore *uncore = stream->uncore; + + /* Reset all contexts' slices/subslices configurations. */ + gen12_configure_all_contexts(stream, NULL, NULL); + + /* disable the context save/restore or OAR counters */ + if (stream->ctx) + gen12_configure_oar_context(stream, NULL); + + /* Make sure we disable noa to save power. */ + intel_uncore_rmw(uncore, RPM_CONFIG1, GEN10_GT_NOA_ENABLE, 0); +} + +static void gen7_oa_enable(struct i915_perf_stream *stream) +{ + struct intel_uncore *uncore = stream->uncore; + struct i915_gem_context *ctx = stream->ctx; + u32 ctx_id = stream->specific_ctx_id; + bool periodic = stream->periodic; + u32 period_exponent = stream->period_exponent; + u32 report_format = stream->oa_buffer.format; + + /* + * Reset buf pointers so we don't forward reports from before now. + * + * Think carefully if considering trying to avoid this, since it + * also ensures status flags and the buffer itself are cleared + * in error paths, and we have checks for invalid reports based + * on the assumption that certain fields are written to zeroed + * memory which this helps maintains. + */ + gen7_init_oa_buffer(stream); + + intel_uncore_write(uncore, GEN7_OACONTROL, + (ctx_id & GEN7_OACONTROL_CTX_MASK) | + (period_exponent << + GEN7_OACONTROL_TIMER_PERIOD_SHIFT) | + (periodic ? GEN7_OACONTROL_TIMER_ENABLE : 0) | + (report_format << GEN7_OACONTROL_FORMAT_SHIFT) | + (ctx ? GEN7_OACONTROL_PER_CTX_ENABLE : 0) | + GEN7_OACONTROL_ENABLE); +} + +static void gen8_oa_enable(struct i915_perf_stream *stream) +{ + struct intel_uncore *uncore = stream->uncore; + u32 report_format = stream->oa_buffer.format; + + /* + * Reset buf pointers so we don't forward reports from before now. + * + * Think carefully if considering trying to avoid this, since it + * also ensures status flags and the buffer itself are cleared + * in error paths, and we have checks for invalid reports based + * on the assumption that certain fields are written to zeroed + * memory which this helps maintains. + */ + gen8_init_oa_buffer(stream); + + /* + * Note: we don't rely on the hardware to perform single context + * filtering and instead filter on the cpu based on the context-id + * field of reports + */ + intel_uncore_write(uncore, GEN8_OACONTROL, + (report_format << GEN8_OA_REPORT_FORMAT_SHIFT) | + GEN8_OA_COUNTER_ENABLE); +} + +static void gen12_oa_enable(struct i915_perf_stream *stream) +{ + struct intel_uncore *uncore = stream->uncore; + u32 report_format = stream->oa_buffer.format; + + /* + * If we don't want OA reports from the OA buffer, then we don't even + * need to program the OAG unit. + */ + if (!(stream->sample_flags & SAMPLE_OA_REPORT)) + return; + + gen12_init_oa_buffer(stream); + + intel_uncore_write(uncore, GEN12_OAG_OACONTROL, + (report_format << GEN12_OAG_OACONTROL_OA_COUNTER_FORMAT_SHIFT) | + GEN12_OAG_OACONTROL_OA_COUNTER_ENABLE); +} + +/** + * i915_oa_stream_enable - handle `I915_PERF_IOCTL_ENABLE` for OA stream + * @stream: An i915 perf stream opened for OA metrics + * + * [Re]enables hardware periodic sampling according to the period configured + * when opening the stream. This also starts a hrtimer that will periodically + * check for data in the circular OA buffer for notifying userspace (e.g. + * during a read() or poll()). + */ +static void i915_oa_stream_enable(struct i915_perf_stream *stream) +{ + stream->pollin = false; + + stream->perf->ops.oa_enable(stream); + + if (stream->sample_flags & SAMPLE_OA_REPORT) + hrtimer_start(&stream->poll_check_timer, + ns_to_ktime(stream->poll_oa_period), + HRTIMER_MODE_REL_PINNED); +} + +static void gen7_oa_disable(struct i915_perf_stream *stream) +{ + struct intel_uncore *uncore = stream->uncore; + + intel_uncore_write(uncore, GEN7_OACONTROL, 0); + if (intel_wait_for_register(uncore, + GEN7_OACONTROL, GEN7_OACONTROL_ENABLE, 0, + 50)) + drm_err(&stream->perf->i915->drm, + "wait for OA to be disabled timed out\n"); +} + +static void gen8_oa_disable(struct i915_perf_stream *stream) +{ + struct intel_uncore *uncore = stream->uncore; + + intel_uncore_write(uncore, GEN8_OACONTROL, 0); + if (intel_wait_for_register(uncore, + GEN8_OACONTROL, GEN8_OA_COUNTER_ENABLE, 0, + 50)) + drm_err(&stream->perf->i915->drm, + "wait for OA to be disabled timed out\n"); +} + +static void gen12_oa_disable(struct i915_perf_stream *stream) +{ + struct intel_uncore *uncore = stream->uncore; + + intel_uncore_write(uncore, GEN12_OAG_OACONTROL, 0); + if (intel_wait_for_register(uncore, + GEN12_OAG_OACONTROL, + GEN12_OAG_OACONTROL_OA_COUNTER_ENABLE, 0, + 50)) + drm_err(&stream->perf->i915->drm, + "wait for OA to be disabled timed out\n"); + + intel_uncore_write(uncore, GEN12_OA_TLB_INV_CR, 1); + if (intel_wait_for_register(uncore, + GEN12_OA_TLB_INV_CR, + 1, 0, + 50)) + drm_err(&stream->perf->i915->drm, + "wait for OA tlb invalidate timed out\n"); +} + +/** + * i915_oa_stream_disable - handle `I915_PERF_IOCTL_DISABLE` for OA stream + * @stream: An i915 perf stream opened for OA metrics + * + * Stops the OA unit from periodically writing counter reports into the + * circular OA buffer. This also stops the hrtimer that periodically checks for + * data in the circular OA buffer, for notifying userspace. + */ +static void i915_oa_stream_disable(struct i915_perf_stream *stream) +{ + stream->perf->ops.oa_disable(stream); + + if (stream->sample_flags & SAMPLE_OA_REPORT) + hrtimer_cancel(&stream->poll_check_timer); +} + +static const struct i915_perf_stream_ops i915_oa_stream_ops = { + .destroy = i915_oa_stream_destroy, + .enable = i915_oa_stream_enable, + .disable = i915_oa_stream_disable, + .wait_unlocked = i915_oa_wait_unlocked, + .poll_wait = i915_oa_poll_wait, + .read = i915_oa_read, +}; + +static int i915_perf_stream_enable_sync(struct i915_perf_stream *stream) +{ + struct i915_active *active; + int err; + + active = i915_active_create(); + if (!active) + return -ENOMEM; + + err = stream->perf->ops.enable_metric_set(stream, active); + if (err == 0) + __i915_active_wait(active, TASK_UNINTERRUPTIBLE); + + i915_active_put(active); + return err; +} + +static void +get_default_sseu_config(struct intel_sseu *out_sseu, + struct intel_engine_cs *engine) +{ + const struct sseu_dev_info *devinfo_sseu = &engine->gt->info.sseu; + + *out_sseu = intel_sseu_from_device_info(devinfo_sseu); + + if (GRAPHICS_VER(engine->i915) == 11) { + /* + * We only need subslice count so it doesn't matter which ones + * we select - just turn off low bits in the amount of half of + * all available subslices per slice. + */ + out_sseu->subslice_mask = + ~(~0 << (hweight8(out_sseu->subslice_mask) / 2)); + out_sseu->slice_mask = 0x1; + } +} + +static int +get_sseu_config(struct intel_sseu *out_sseu, + struct intel_engine_cs *engine, + const struct drm_i915_gem_context_param_sseu *drm_sseu) +{ + if (drm_sseu->engine.engine_class != engine->uabi_class || + drm_sseu->engine.engine_instance != engine->uabi_instance) + return -EINVAL; + + return i915_gem_user_to_context_sseu(engine->gt, drm_sseu, out_sseu); +} + +/** + * i915_oa_stream_init - validate combined props for OA stream and init + * @stream: An i915 perf stream + * @param: The open parameters passed to `DRM_I915_PERF_OPEN` + * @props: The property state that configures stream (individually validated) + * + * While read_properties_unlocked() validates properties in isolation it + * doesn't ensure that the combination necessarily makes sense. + * + * At this point it has been determined that userspace wants a stream of + * OA metrics, but still we need to further validate the combined + * properties are OK. + * + * If the configuration makes sense then we can allocate memory for + * a circular OA buffer and apply the requested metric set configuration. + * + * Returns: zero on success or a negative error code. + */ +static int i915_oa_stream_init(struct i915_perf_stream *stream, + struct drm_i915_perf_open_param *param, + struct perf_open_properties *props) +{ + struct drm_i915_private *i915 = stream->perf->i915; + struct i915_perf *perf = stream->perf; + int format_size; + int ret; + + if (!props->engine) { + drm_dbg(&stream->perf->i915->drm, + "OA engine not specified\n"); + return -EINVAL; + } + + /* + * If the sysfs metrics/ directory wasn't registered for some + * reason then don't let userspace try their luck with config + * IDs + */ + if (!perf->metrics_kobj) { + drm_dbg(&stream->perf->i915->drm, + "OA metrics weren't advertised via sysfs\n"); + return -EINVAL; + } + + if (!(props->sample_flags & SAMPLE_OA_REPORT) && + (GRAPHICS_VER(perf->i915) < 12 || !stream->ctx)) { + drm_dbg(&stream->perf->i915->drm, + "Only OA report sampling supported\n"); + return -EINVAL; + } + + if (!perf->ops.enable_metric_set) { + drm_dbg(&stream->perf->i915->drm, + "OA unit not supported\n"); + return -ENODEV; + } + + /* + * To avoid the complexity of having to accurately filter + * counter reports and marshal to the appropriate client + * we currently only allow exclusive access + */ + if (perf->exclusive_stream) { + drm_dbg(&stream->perf->i915->drm, + "OA unit already in use\n"); + return -EBUSY; + } + + if (!props->oa_format) { + drm_dbg(&stream->perf->i915->drm, + "OA report format not specified\n"); + return -EINVAL; + } + + stream->engine = props->engine; + stream->uncore = stream->engine->gt->uncore; + + stream->sample_size = sizeof(struct drm_i915_perf_record_header); + + format_size = perf->oa_formats[props->oa_format].size; + + stream->sample_flags = props->sample_flags; + stream->sample_size += format_size; + + stream->oa_buffer.format_size = format_size; + if (drm_WARN_ON(&i915->drm, stream->oa_buffer.format_size == 0)) + return -EINVAL; + + stream->hold_preemption = props->hold_preemption; + + stream->oa_buffer.format = + perf->oa_formats[props->oa_format].format; + + stream->periodic = props->oa_periodic; + if (stream->periodic) + stream->period_exponent = props->oa_period_exponent; + + if (stream->ctx) { + ret = oa_get_render_ctx_id(stream); + if (ret) { + drm_dbg(&stream->perf->i915->drm, + "Invalid context id to filter with\n"); + return ret; + } + } + + ret = alloc_noa_wait(stream); + if (ret) { + drm_dbg(&stream->perf->i915->drm, + "Unable to allocate NOA wait batch buffer\n"); + goto err_noa_wait_alloc; + } + + stream->oa_config = i915_perf_get_oa_config(perf, props->metrics_set); + if (!stream->oa_config) { + drm_dbg(&stream->perf->i915->drm, + "Invalid OA config id=%i\n", props->metrics_set); + ret = -EINVAL; + goto err_config; + } + + /* PRM - observability performance counters: + * + * OACONTROL, performance counter enable, note: + * + * "When this bit is set, in order to have coherent counts, + * RC6 power state and trunk clock gating must be disabled. + * This can be achieved by programming MMIO registers as + * 0xA094=0 and 0xA090[31]=1" + * + * In our case we are expecting that taking pm + FORCEWAKE + * references will effectively disable RC6. + */ + intel_engine_pm_get(stream->engine); + intel_uncore_forcewake_get(stream->uncore, FORCEWAKE_ALL); + + ret = alloc_oa_buffer(stream); + if (ret) + goto err_oa_buf_alloc; + + stream->ops = &i915_oa_stream_ops; + + perf->sseu = props->sseu; + WRITE_ONCE(perf->exclusive_stream, stream); + + ret = i915_perf_stream_enable_sync(stream); + if (ret) { + drm_dbg(&stream->perf->i915->drm, + "Unable to enable metric set\n"); + goto err_enable; + } + + drm_dbg(&stream->perf->i915->drm, + "opening stream oa config uuid=%s\n", + stream->oa_config->uuid); + + hrtimer_init(&stream->poll_check_timer, + CLOCK_MONOTONIC, HRTIMER_MODE_REL); + stream->poll_check_timer.function = oa_poll_check_timer_cb; + init_waitqueue_head(&stream->poll_wq); + spin_lock_init(&stream->oa_buffer.ptr_lock); + + return 0; + +err_enable: + WRITE_ONCE(perf->exclusive_stream, NULL); + perf->ops.disable_metric_set(stream); + + free_oa_buffer(stream); + +err_oa_buf_alloc: + free_oa_configs(stream); + + intel_uncore_forcewake_put(stream->uncore, FORCEWAKE_ALL); + intel_engine_pm_put(stream->engine); + +err_config: + free_noa_wait(stream); + +err_noa_wait_alloc: + if (stream->ctx) + oa_put_render_ctx_id(stream); + + return ret; +} + +void i915_oa_init_reg_state(const struct intel_context *ce, + const struct intel_engine_cs *engine) +{ + struct i915_perf_stream *stream; + + if (engine->class != RENDER_CLASS) + return; + + /* perf.exclusive_stream serialised by lrc_configure_all_contexts() */ + stream = READ_ONCE(engine->i915->perf.exclusive_stream); + if (stream && GRAPHICS_VER(stream->perf->i915) < 12) + gen8_update_reg_state_unlocked(ce, stream); +} + +/** + * i915_perf_read - handles read() FOP for i915 perf stream FDs + * @file: An i915 perf stream file + * @buf: destination buffer given by userspace + * @count: the number of bytes userspace wants to read + * @ppos: (inout) file seek position (unused) + * + * The entry point for handling a read() on a stream file descriptor from + * userspace. Most of the work is left to the i915_perf_read_locked() and + * &i915_perf_stream_ops->read but to save having stream implementations (of + * which we might have multiple later) we handle blocking read here. + * + * We can also consistently treat trying to read from a disabled stream + * as an IO error so implementations can assume the stream is enabled + * while reading. + * + * Returns: The number of bytes copied or a negative error code on failure. + */ +static ssize_t i915_perf_read(struct file *file, + char __user *buf, + size_t count, + loff_t *ppos) +{ + struct i915_perf_stream *stream = file->private_data; + struct i915_perf *perf = stream->perf; + size_t offset = 0; + int ret; + + /* To ensure it's handled consistently we simply treat all reads of a + * disabled stream as an error. In particular it might otherwise lead + * to a deadlock for blocking file descriptors... + */ + if (!stream->enabled || !(stream->sample_flags & SAMPLE_OA_REPORT)) + return -EIO; + + if (!(file->f_flags & O_NONBLOCK)) { + /* There's the small chance of false positives from + * stream->ops->wait_unlocked. + * + * E.g. with single context filtering since we only wait until + * oabuffer has >= 1 report we don't immediately know whether + * any reports really belong to the current context + */ + do { + ret = stream->ops->wait_unlocked(stream); + if (ret) + return ret; + + mutex_lock(&perf->lock); + ret = stream->ops->read(stream, buf, count, &offset); + mutex_unlock(&perf->lock); + } while (!offset && !ret); + } else { + mutex_lock(&perf->lock); + ret = stream->ops->read(stream, buf, count, &offset); + mutex_unlock(&perf->lock); + } + + /* We allow the poll checking to sometimes report false positive EPOLLIN + * events where we might actually report EAGAIN on read() if there's + * not really any data available. In this situation though we don't + * want to enter a busy loop between poll() reporting a EPOLLIN event + * and read() returning -EAGAIN. Clearing the oa.pollin state here + * effectively ensures we back off until the next hrtimer callback + * before reporting another EPOLLIN event. + * The exception to this is if ops->read() returned -ENOSPC which means + * that more OA data is available than could fit in the user provided + * buffer. In this case we want the next poll() call to not block. + */ + if (ret != -ENOSPC) + stream->pollin = false; + + /* Possible values for ret are 0, -EFAULT, -ENOSPC, -EIO, ... */ + return offset ?: (ret ?: -EAGAIN); +} + +static enum hrtimer_restart oa_poll_check_timer_cb(struct hrtimer *hrtimer) +{ + struct i915_perf_stream *stream = + container_of(hrtimer, typeof(*stream), poll_check_timer); + + if (oa_buffer_check_unlocked(stream)) { + stream->pollin = true; + wake_up(&stream->poll_wq); + } + + hrtimer_forward_now(hrtimer, + ns_to_ktime(stream->poll_oa_period)); + + return HRTIMER_RESTART; +} + +/** + * i915_perf_poll_locked - poll_wait() with a suitable wait queue for stream + * @stream: An i915 perf stream + * @file: An i915 perf stream file + * @wait: poll() state table + * + * For handling userspace polling on an i915 perf stream, this calls through to + * &i915_perf_stream_ops->poll_wait to call poll_wait() with a wait queue that + * will be woken for new stream data. + * + * Note: The &perf->lock mutex has been taken to serialize + * with any non-file-operation driver hooks. + * + * Returns: any poll events that are ready without sleeping + */ +static __poll_t i915_perf_poll_locked(struct i915_perf_stream *stream, + struct file *file, + poll_table *wait) +{ + __poll_t events = 0; + + stream->ops->poll_wait(stream, file, wait); + + /* Note: we don't explicitly check whether there's something to read + * here since this path may be very hot depending on what else + * userspace is polling, or on the timeout in use. We rely solely on + * the hrtimer/oa_poll_check_timer_cb to notify us when there are + * samples to read. + */ + if (stream->pollin) + events |= EPOLLIN; + + return events; +} + +/** + * i915_perf_poll - call poll_wait() with a suitable wait queue for stream + * @file: An i915 perf stream file + * @wait: poll() state table + * + * For handling userspace polling on an i915 perf stream, this ensures + * poll_wait() gets called with a wait queue that will be woken for new stream + * data. + * + * Note: Implementation deferred to i915_perf_poll_locked() + * + * Returns: any poll events that are ready without sleeping + */ +static __poll_t i915_perf_poll(struct file *file, poll_table *wait) +{ + struct i915_perf_stream *stream = file->private_data; + struct i915_perf *perf = stream->perf; + __poll_t ret; + + mutex_lock(&perf->lock); + ret = i915_perf_poll_locked(stream, file, wait); + mutex_unlock(&perf->lock); + + return ret; +} + +/** + * i915_perf_enable_locked - handle `I915_PERF_IOCTL_ENABLE` ioctl + * @stream: A disabled i915 perf stream + * + * [Re]enables the associated capture of data for this stream. + * + * If a stream was previously enabled then there's currently no intention + * to provide userspace any guarantee about the preservation of previously + * buffered data. + */ +static void i915_perf_enable_locked(struct i915_perf_stream *stream) +{ + if (stream->enabled) + return; + + /* Allow stream->ops->enable() to refer to this */ + stream->enabled = true; + + if (stream->ops->enable) + stream->ops->enable(stream); + + if (stream->hold_preemption) + intel_context_set_nopreempt(stream->pinned_ctx); +} + +/** + * i915_perf_disable_locked - handle `I915_PERF_IOCTL_DISABLE` ioctl + * @stream: An enabled i915 perf stream + * + * Disables the associated capture of data for this stream. + * + * The intention is that disabling an re-enabling a stream will ideally be + * cheaper than destroying and re-opening a stream with the same configuration, + * though there are no formal guarantees about what state or buffered data + * must be retained between disabling and re-enabling a stream. + * + * Note: while a stream is disabled it's considered an error for userspace + * to attempt to read from the stream (-EIO). + */ +static void i915_perf_disable_locked(struct i915_perf_stream *stream) +{ + if (!stream->enabled) + return; + + /* Allow stream->ops->disable() to refer to this */ + stream->enabled = false; + + if (stream->hold_preemption) + intel_context_clear_nopreempt(stream->pinned_ctx); + + if (stream->ops->disable) + stream->ops->disable(stream); +} + +static long i915_perf_config_locked(struct i915_perf_stream *stream, + unsigned long metrics_set) +{ + struct i915_oa_config *config; + long ret = stream->oa_config->id; + + config = i915_perf_get_oa_config(stream->perf, metrics_set); + if (!config) + return -EINVAL; + + if (config != stream->oa_config) { + int err; + + /* + * If OA is bound to a specific context, emit the + * reconfiguration inline from that context. The update + * will then be ordered with respect to submission on that + * context. + * + * When set globally, we use a low priority kernel context, + * so it will effectively take effect when idle. + */ + err = emit_oa_config(stream, config, oa_context(stream), NULL); + if (!err) + config = xchg(&stream->oa_config, config); + else + ret = err; + } + + i915_oa_config_put(config); + + return ret; +} + +/** + * i915_perf_ioctl_locked - support ioctl() usage with i915 perf stream FDs + * @stream: An i915 perf stream + * @cmd: the ioctl request + * @arg: the ioctl data + * + * Note: The &perf->lock mutex has been taken to serialize + * with any non-file-operation driver hooks. + * + * Returns: zero on success or a negative error code. Returns -EINVAL for + * an unknown ioctl request. + */ +static long i915_perf_ioctl_locked(struct i915_perf_stream *stream, + unsigned int cmd, + unsigned long arg) +{ + switch (cmd) { + case I915_PERF_IOCTL_ENABLE: + i915_perf_enable_locked(stream); + return 0; + case I915_PERF_IOCTL_DISABLE: + i915_perf_disable_locked(stream); + return 0; + case I915_PERF_IOCTL_CONFIG: + return i915_perf_config_locked(stream, arg); + } + + return -EINVAL; +} + +/** + * i915_perf_ioctl - support ioctl() usage with i915 perf stream FDs + * @file: An i915 perf stream file + * @cmd: the ioctl request + * @arg: the ioctl data + * + * Implementation deferred to i915_perf_ioctl_locked(). + * + * Returns: zero on success or a negative error code. Returns -EINVAL for + * an unknown ioctl request. + */ +static long i915_perf_ioctl(struct file *file, + unsigned int cmd, + unsigned long arg) +{ + struct i915_perf_stream *stream = file->private_data; + struct i915_perf *perf = stream->perf; + long ret; + + mutex_lock(&perf->lock); + ret = i915_perf_ioctl_locked(stream, cmd, arg); + mutex_unlock(&perf->lock); + + return ret; +} + +/** + * i915_perf_destroy_locked - destroy an i915 perf stream + * @stream: An i915 perf stream + * + * Frees all resources associated with the given i915 perf @stream, disabling + * any associated data capture in the process. + * + * Note: The &perf->lock mutex has been taken to serialize + * with any non-file-operation driver hooks. + */ +static void i915_perf_destroy_locked(struct i915_perf_stream *stream) +{ + if (stream->enabled) + i915_perf_disable_locked(stream); + + if (stream->ops->destroy) + stream->ops->destroy(stream); + + if (stream->ctx) + i915_gem_context_put(stream->ctx); + + kfree(stream); +} + +/** + * i915_perf_release - handles userspace close() of a stream file + * @inode: anonymous inode associated with file + * @file: An i915 perf stream file + * + * Cleans up any resources associated with an open i915 perf stream file. + * + * NB: close() can't really fail from the userspace point of view. + * + * Returns: zero on success or a negative error code. + */ +static int i915_perf_release(struct inode *inode, struct file *file) +{ + struct i915_perf_stream *stream = file->private_data; + struct i915_perf *perf = stream->perf; + + mutex_lock(&perf->lock); + i915_perf_destroy_locked(stream); + mutex_unlock(&perf->lock); + + /* Release the reference the perf stream kept on the driver. */ + drm_dev_put(&perf->i915->drm); + + return 0; +} + + +static const struct file_operations fops = { + .owner = THIS_MODULE, + .llseek = no_llseek, + .release = i915_perf_release, + .poll = i915_perf_poll, + .read = i915_perf_read, + .unlocked_ioctl = i915_perf_ioctl, + /* Our ioctl have no arguments, so it's safe to use the same function + * to handle 32bits compatibility. + */ + .compat_ioctl = i915_perf_ioctl, +}; + + +/** + * i915_perf_open_ioctl_locked - DRM ioctl() for userspace to open a stream FD + * @perf: i915 perf instance + * @param: The open parameters passed to 'DRM_I915_PERF_OPEN` + * @props: individually validated u64 property value pairs + * @file: drm file + * + * See i915_perf_ioctl_open() for interface details. + * + * Implements further stream config validation and stream initialization on + * behalf of i915_perf_open_ioctl() with the &perf->lock mutex + * taken to serialize with any non-file-operation driver hooks. + * + * Note: at this point the @props have only been validated in isolation and + * it's still necessary to validate that the combination of properties makes + * sense. + * + * In the case where userspace is interested in OA unit metrics then further + * config validation and stream initialization details will be handled by + * i915_oa_stream_init(). The code here should only validate config state that + * will be relevant to all stream types / backends. + * + * Returns: zero on success or a negative error code. + */ +static int +i915_perf_open_ioctl_locked(struct i915_perf *perf, + struct drm_i915_perf_open_param *param, + struct perf_open_properties *props, + struct drm_file *file) +{ + struct i915_gem_context *specific_ctx = NULL; + struct i915_perf_stream *stream = NULL; + unsigned long f_flags = 0; + bool privileged_op = true; + int stream_fd; + int ret; + + if (props->single_context) { + u32 ctx_handle = props->ctx_handle; + struct drm_i915_file_private *file_priv = file->driver_priv; + + specific_ctx = i915_gem_context_lookup(file_priv, ctx_handle); + if (IS_ERR(specific_ctx)) { + drm_dbg(&perf->i915->drm, + "Failed to look up context with ID %u for opening perf stream\n", + ctx_handle); + ret = PTR_ERR(specific_ctx); + goto err; + } + } + + /* + * On Haswell the OA unit supports clock gating off for a specific + * context and in this mode there's no visibility of metrics for the + * rest of the system, which we consider acceptable for a + * non-privileged client. + * + * For Gen8->11 the OA unit no longer supports clock gating off for a + * specific context and the kernel can't securely stop the counters + * from updating as system-wide / global values. Even though we can + * filter reports based on the included context ID we can't block + * clients from seeing the raw / global counter values via + * MI_REPORT_PERF_COUNT commands and so consider it a privileged op to + * enable the OA unit by default. + * + * For Gen12+ we gain a new OAR unit that only monitors the RCS on a + * per context basis. So we can relax requirements there if the user + * doesn't request global stream access (i.e. query based sampling + * using MI_RECORD_PERF_COUNT. + */ + if (IS_HASWELL(perf->i915) && specific_ctx) + privileged_op = false; + else if (GRAPHICS_VER(perf->i915) == 12 && specific_ctx && + (props->sample_flags & SAMPLE_OA_REPORT) == 0) + privileged_op = false; + + if (props->hold_preemption) { + if (!props->single_context) { + drm_dbg(&perf->i915->drm, + "preemption disable with no context\n"); + ret = -EINVAL; + goto err; + } + privileged_op = true; + } + + /* + * Asking for SSEU configuration is a priviliged operation. + */ + if (props->has_sseu) + privileged_op = true; + else + get_default_sseu_config(&props->sseu, props->engine); + + /* Similar to perf's kernel.perf_paranoid_cpu sysctl option + * we check a dev.i915.perf_stream_paranoid sysctl option + * to determine if it's ok to access system wide OA counters + * without CAP_PERFMON or CAP_SYS_ADMIN privileges. + */ + if (privileged_op && + i915_perf_stream_paranoid && !perfmon_capable()) { + drm_dbg(&perf->i915->drm, + "Insufficient privileges to open i915 perf stream\n"); + ret = -EACCES; + goto err_ctx; + } + + stream = kzalloc(sizeof(*stream), GFP_KERNEL); + if (!stream) { + ret = -ENOMEM; + goto err_ctx; + } + + stream->perf = perf; + stream->ctx = specific_ctx; + stream->poll_oa_period = props->poll_oa_period; + + ret = i915_oa_stream_init(stream, param, props); + if (ret) + goto err_alloc; + + /* we avoid simply assigning stream->sample_flags = props->sample_flags + * to have _stream_init check the combination of sample flags more + * thoroughly, but still this is the expected result at this point. + */ + if (WARN_ON(stream->sample_flags != props->sample_flags)) { + ret = -ENODEV; + goto err_flags; + } + + if (param->flags & I915_PERF_FLAG_FD_CLOEXEC) + f_flags |= O_CLOEXEC; + if (param->flags & I915_PERF_FLAG_FD_NONBLOCK) + f_flags |= O_NONBLOCK; + + stream_fd = anon_inode_getfd("[i915_perf]", &fops, stream, f_flags); + if (stream_fd < 0) { + ret = stream_fd; + goto err_flags; + } + + if (!(param->flags & I915_PERF_FLAG_DISABLED)) + i915_perf_enable_locked(stream); + + /* Take a reference on the driver that will be kept with stream_fd + * until its release. + */ + drm_dev_get(&perf->i915->drm); + + return stream_fd; + +err_flags: + if (stream->ops->destroy) + stream->ops->destroy(stream); +err_alloc: + kfree(stream); +err_ctx: + if (specific_ctx) + i915_gem_context_put(specific_ctx); +err: + return ret; +} + +static u64 oa_exponent_to_ns(struct i915_perf *perf, int exponent) +{ + return intel_gt_clock_interval_to_ns(to_gt(perf->i915), + 2ULL << exponent); +} + +static __always_inline bool +oa_format_valid(struct i915_perf *perf, enum drm_i915_oa_format format) +{ + return test_bit(format, perf->format_mask); +} + +static __always_inline void +oa_format_add(struct i915_perf *perf, enum drm_i915_oa_format format) +{ + __set_bit(format, perf->format_mask); +} + +/** + * read_properties_unlocked - validate + copy userspace stream open properties + * @perf: i915 perf instance + * @uprops: The array of u64 key value pairs given by userspace + * @n_props: The number of key value pairs expected in @uprops + * @props: The stream configuration built up while validating properties + * + * Note this function only validates properties in isolation it doesn't + * validate that the combination of properties makes sense or that all + * properties necessary for a particular kind of stream have been set. + * + * Note that there currently aren't any ordering requirements for properties so + * we shouldn't validate or assume anything about ordering here. This doesn't + * rule out defining new properties with ordering requirements in the future. + */ +static int read_properties_unlocked(struct i915_perf *perf, + u64 __user *uprops, + u32 n_props, + struct perf_open_properties *props) +{ + u64 __user *uprop = uprops; + u32 i; + int ret; + + memset(props, 0, sizeof(struct perf_open_properties)); + props->poll_oa_period = DEFAULT_POLL_PERIOD_NS; + + if (!n_props) { + drm_dbg(&perf->i915->drm, + "No i915 perf properties given\n"); + return -EINVAL; + } + + /* At the moment we only support using i915-perf on the RCS. */ + props->engine = intel_engine_lookup_user(perf->i915, + I915_ENGINE_CLASS_RENDER, + 0); + if (!props->engine) { + drm_dbg(&perf->i915->drm, + "No RENDER-capable engines\n"); + return -EINVAL; + } + + /* Considering that ID = 0 is reserved and assuming that we don't + * (currently) expect any configurations to ever specify duplicate + * values for a particular property ID then the last _PROP_MAX value is + * one greater than the maximum number of properties we expect to get + * from userspace. + */ + if (n_props >= DRM_I915_PERF_PROP_MAX) { + drm_dbg(&perf->i915->drm, + "More i915 perf properties specified than exist\n"); + return -EINVAL; + } + + for (i = 0; i < n_props; i++) { + u64 oa_period, oa_freq_hz; + u64 id, value; + + ret = get_user(id, uprop); + if (ret) + return ret; + + ret = get_user(value, uprop + 1); + if (ret) + return ret; + + if (id == 0 || id >= DRM_I915_PERF_PROP_MAX) { + drm_dbg(&perf->i915->drm, + "Unknown i915 perf property ID\n"); + return -EINVAL; + } + + switch ((enum drm_i915_perf_property_id)id) { + case DRM_I915_PERF_PROP_CTX_HANDLE: + props->single_context = 1; + props->ctx_handle = value; + break; + case DRM_I915_PERF_PROP_SAMPLE_OA: + if (value) + props->sample_flags |= SAMPLE_OA_REPORT; + break; + case DRM_I915_PERF_PROP_OA_METRICS_SET: + if (value == 0) { + drm_dbg(&perf->i915->drm, + "Unknown OA metric set ID\n"); + return -EINVAL; + } + props->metrics_set = value; + break; + case DRM_I915_PERF_PROP_OA_FORMAT: + if (value == 0 || value >= I915_OA_FORMAT_MAX) { + drm_dbg(&perf->i915->drm, + "Out-of-range OA report format %llu\n", + value); + return -EINVAL; + } + if (!oa_format_valid(perf, value)) { + drm_dbg(&perf->i915->drm, + "Unsupported OA report format %llu\n", + value); + return -EINVAL; + } + props->oa_format = value; + break; + case DRM_I915_PERF_PROP_OA_EXPONENT: + if (value > OA_EXPONENT_MAX) { + drm_dbg(&perf->i915->drm, + "OA timer exponent too high (> %u)\n", + OA_EXPONENT_MAX); + return -EINVAL; + } + + /* Theoretically we can program the OA unit to sample + * e.g. every 160ns for HSW, 167ns for BDW/SKL or 104ns + * for BXT. We don't allow such high sampling + * frequencies by default unless root. + */ + + BUILD_BUG_ON(sizeof(oa_period) != 8); + oa_period = oa_exponent_to_ns(perf, value); + + /* This check is primarily to ensure that oa_period <= + * UINT32_MAX (before passing to do_div which only + * accepts a u32 denominator), but we can also skip + * checking anything < 1Hz which implicitly can't be + * limited via an integer oa_max_sample_rate. + */ + if (oa_period <= NSEC_PER_SEC) { + u64 tmp = NSEC_PER_SEC; + do_div(tmp, oa_period); + oa_freq_hz = tmp; + } else + oa_freq_hz = 0; + + if (oa_freq_hz > i915_oa_max_sample_rate && !perfmon_capable()) { + drm_dbg(&perf->i915->drm, + "OA exponent would exceed the max sampling frequency (sysctl dev.i915.oa_max_sample_rate) %uHz without CAP_PERFMON or CAP_SYS_ADMIN privileges\n", + i915_oa_max_sample_rate); + return -EACCES; + } + + props->oa_periodic = true; + props->oa_period_exponent = value; + break; + case DRM_I915_PERF_PROP_HOLD_PREEMPTION: + props->hold_preemption = !!value; + break; + case DRM_I915_PERF_PROP_GLOBAL_SSEU: { + struct drm_i915_gem_context_param_sseu user_sseu; + + if (GRAPHICS_VER_FULL(perf->i915) >= IP_VER(12, 50)) { + drm_dbg(&perf->i915->drm, + "SSEU config not supported on gfx %x\n", + GRAPHICS_VER_FULL(perf->i915)); + return -ENODEV; + } + + if (copy_from_user(&user_sseu, + u64_to_user_ptr(value), + sizeof(user_sseu))) { + drm_dbg(&perf->i915->drm, + "Unable to copy global sseu parameter\n"); + return -EFAULT; + } + + ret = get_sseu_config(&props->sseu, props->engine, &user_sseu); + if (ret) { + drm_dbg(&perf->i915->drm, + "Invalid SSEU configuration\n"); + return ret; + } + props->has_sseu = true; + break; + } + case DRM_I915_PERF_PROP_POLL_OA_PERIOD: + if (value < 100000 /* 100us */) { + drm_dbg(&perf->i915->drm, + "OA availability timer too small (%lluns < 100us)\n", + value); + return -EINVAL; + } + props->poll_oa_period = value; + break; + case DRM_I915_PERF_PROP_MAX: + MISSING_CASE(id); + return -EINVAL; + } + + uprop += 2; + } + + return 0; +} + +/** + * i915_perf_open_ioctl - DRM ioctl() for userspace to open a stream FD + * @dev: drm device + * @data: ioctl data copied from userspace (unvalidated) + * @file: drm file + * + * Validates the stream open parameters given by userspace including flags + * and an array of u64 key, value pair properties. + * + * Very little is assumed up front about the nature of the stream being + * opened (for instance we don't assume it's for periodic OA unit metrics). An + * i915-perf stream is expected to be a suitable interface for other forms of + * buffered data written by the GPU besides periodic OA metrics. + * + * Note we copy the properties from userspace outside of the i915 perf + * mutex to avoid an awkward lockdep with mmap_lock. + * + * Most of the implementation details are handled by + * i915_perf_open_ioctl_locked() after taking the &perf->lock + * mutex for serializing with any non-file-operation driver hooks. + * + * Return: A newly opened i915 Perf stream file descriptor or negative + * error code on failure. + */ +int i915_perf_open_ioctl(struct drm_device *dev, void *data, + struct drm_file *file) +{ + struct i915_perf *perf = &to_i915(dev)->perf; + struct drm_i915_perf_open_param *param = data; + struct perf_open_properties props; + u32 known_open_flags; + int ret; + + if (!perf->i915) + return -ENOTSUPP; + + known_open_flags = I915_PERF_FLAG_FD_CLOEXEC | + I915_PERF_FLAG_FD_NONBLOCK | + I915_PERF_FLAG_DISABLED; + if (param->flags & ~known_open_flags) { + drm_dbg(&perf->i915->drm, + "Unknown drm_i915_perf_open_param flag\n"); + return -EINVAL; + } + + ret = read_properties_unlocked(perf, + u64_to_user_ptr(param->properties_ptr), + param->num_properties, + &props); + if (ret) + return ret; + + mutex_lock(&perf->lock); + ret = i915_perf_open_ioctl_locked(perf, param, &props, file); + mutex_unlock(&perf->lock); + + return ret; +} + +/** + * i915_perf_register - exposes i915-perf to userspace + * @i915: i915 device instance + * + * In particular OA metric sets are advertised under a sysfs metrics/ + * directory allowing userspace to enumerate valid IDs that can be + * used to open an i915-perf stream. + */ +void i915_perf_register(struct drm_i915_private *i915) +{ + struct i915_perf *perf = &i915->perf; + + if (!perf->i915) + return; + + /* To be sure we're synchronized with an attempted + * i915_perf_open_ioctl(); considering that we register after + * being exposed to userspace. + */ + mutex_lock(&perf->lock); + + perf->metrics_kobj = + kobject_create_and_add("metrics", + &i915->drm.primary->kdev->kobj); + + mutex_unlock(&perf->lock); +} + +/** + * i915_perf_unregister - hide i915-perf from userspace + * @i915: i915 device instance + * + * i915-perf state cleanup is split up into an 'unregister' and + * 'deinit' phase where the interface is first hidden from + * userspace by i915_perf_unregister() before cleaning up + * remaining state in i915_perf_fini(). + */ +void i915_perf_unregister(struct drm_i915_private *i915) +{ + struct i915_perf *perf = &i915->perf; + + if (!perf->metrics_kobj) + return; + + kobject_put(perf->metrics_kobj); + perf->metrics_kobj = NULL; +} + +static bool gen8_is_valid_flex_addr(struct i915_perf *perf, u32 addr) +{ + static const i915_reg_t flex_eu_regs[] = { + EU_PERF_CNTL0, + EU_PERF_CNTL1, + EU_PERF_CNTL2, + EU_PERF_CNTL3, + EU_PERF_CNTL4, + EU_PERF_CNTL5, + EU_PERF_CNTL6, + }; + int i; + + for (i = 0; i < ARRAY_SIZE(flex_eu_regs); i++) { + if (i915_mmio_reg_offset(flex_eu_regs[i]) == addr) + return true; + } + return false; +} + +static bool reg_in_range_table(u32 addr, const struct i915_range *table) +{ + while (table->start || table->end) { + if (addr >= table->start && addr <= table->end) + return true; + + table++; + } + + return false; +} + +#define REG_EQUAL(addr, mmio) \ + ((addr) == i915_mmio_reg_offset(mmio)) + +static const struct i915_range gen7_oa_b_counters[] = { + { .start = 0x2710, .end = 0x272c }, /* OASTARTTRIG[1-8] */ + { .start = 0x2740, .end = 0x275c }, /* OAREPORTTRIG[1-8] */ + { .start = 0x2770, .end = 0x27ac }, /* OACEC[0-7][0-1] */ + {} +}; + +static const struct i915_range gen12_oa_b_counters[] = { + { .start = 0x2b2c, .end = 0x2b2c }, /* GEN12_OAG_OA_PESS */ + { .start = 0xd900, .end = 0xd91c }, /* GEN12_OAG_OASTARTTRIG[1-8] */ + { .start = 0xd920, .end = 0xd93c }, /* GEN12_OAG_OAREPORTTRIG1[1-8] */ + { .start = 0xd940, .end = 0xd97c }, /* GEN12_OAG_CEC[0-7][0-1] */ + { .start = 0xdc00, .end = 0xdc3c }, /* GEN12_OAG_SCEC[0-7][0-1] */ + { .start = 0xdc40, .end = 0xdc40 }, /* GEN12_OAG_SPCTR_CNF */ + { .start = 0xdc44, .end = 0xdc44 }, /* GEN12_OAA_DBG_REG */ + {} +}; + +static const struct i915_range gen7_oa_mux_regs[] = { + { .start = 0x91b8, .end = 0x91cc }, /* OA_PERFCNT[1-2], OA_PERFMATRIX */ + { .start = 0x9800, .end = 0x9888 }, /* MICRO_BP0_0 - NOA_WRITE */ + { .start = 0xe180, .end = 0xe180 }, /* HALF_SLICE_CHICKEN2 */ + {} +}; + +static const struct i915_range hsw_oa_mux_regs[] = { + { .start = 0x09e80, .end = 0x09ea4 }, /* HSW_MBVID2_NOA[0-9] */ + { .start = 0x09ec0, .end = 0x09ec0 }, /* HSW_MBVID2_MISR0 */ + { .start = 0x25100, .end = 0x2ff90 }, + {} +}; + +static const struct i915_range chv_oa_mux_regs[] = { + { .start = 0x182300, .end = 0x1823a4 }, + {} +}; + +static const struct i915_range gen8_oa_mux_regs[] = { + { .start = 0x0d00, .end = 0x0d2c }, /* RPM_CONFIG[0-1], NOA_CONFIG[0-8] */ + { .start = 0x20cc, .end = 0x20cc }, /* WAIT_FOR_RC6_EXIT */ + {} +}; + +static const struct i915_range gen11_oa_mux_regs[] = { + { .start = 0x91c8, .end = 0x91dc }, /* OA_PERFCNT[3-4] */ + {} +}; + +static const struct i915_range gen12_oa_mux_regs[] = { + { .start = 0x0d00, .end = 0x0d04 }, /* RPM_CONFIG[0-1] */ + { .start = 0x0d0c, .end = 0x0d2c }, /* NOA_CONFIG[0-8] */ + { .start = 0x9840, .end = 0x9840 }, /* GDT_CHICKEN_BITS */ + { .start = 0x9884, .end = 0x9888 }, /* NOA_WRITE */ + { .start = 0x20cc, .end = 0x20cc }, /* WAIT_FOR_RC6_EXIT */ + {} +}; + +static bool gen7_is_valid_b_counter_addr(struct i915_perf *perf, u32 addr) +{ + return reg_in_range_table(addr, gen7_oa_b_counters); +} + +static bool gen8_is_valid_mux_addr(struct i915_perf *perf, u32 addr) +{ + return reg_in_range_table(addr, gen7_oa_mux_regs) || + reg_in_range_table(addr, gen8_oa_mux_regs); +} + +static bool gen11_is_valid_mux_addr(struct i915_perf *perf, u32 addr) +{ + return reg_in_range_table(addr, gen7_oa_mux_regs) || + reg_in_range_table(addr, gen8_oa_mux_regs) || + reg_in_range_table(addr, gen11_oa_mux_regs); +} + +static bool hsw_is_valid_mux_addr(struct i915_perf *perf, u32 addr) +{ + return reg_in_range_table(addr, gen7_oa_mux_regs) || + reg_in_range_table(addr, hsw_oa_mux_regs); +} + +static bool chv_is_valid_mux_addr(struct i915_perf *perf, u32 addr) +{ + return reg_in_range_table(addr, gen7_oa_mux_regs) || + reg_in_range_table(addr, chv_oa_mux_regs); +} + +static bool gen12_is_valid_b_counter_addr(struct i915_perf *perf, u32 addr) +{ + return reg_in_range_table(addr, gen12_oa_b_counters); +} + +static bool gen12_is_valid_mux_addr(struct i915_perf *perf, u32 addr) +{ + return reg_in_range_table(addr, gen12_oa_mux_regs); +} + +static u32 mask_reg_value(u32 reg, u32 val) +{ + /* HALF_SLICE_CHICKEN2 is programmed with a the + * WaDisableSTUnitPowerOptimization workaround. Make sure the value + * programmed by userspace doesn't change this. + */ + if (REG_EQUAL(reg, HALF_SLICE_CHICKEN2)) + val = val & ~_MASKED_BIT_ENABLE(GEN8_ST_PO_DISABLE); + + /* WAIT_FOR_RC6_EXIT has only one bit fullfilling the function + * indicated by its name and a bunch of selection fields used by OA + * configs. + */ + if (REG_EQUAL(reg, WAIT_FOR_RC6_EXIT)) + val = val & ~_MASKED_BIT_ENABLE(HSW_WAIT_FOR_RC6_EXIT_ENABLE); + + return val; +} + +static struct i915_oa_reg *alloc_oa_regs(struct i915_perf *perf, + bool (*is_valid)(struct i915_perf *perf, u32 addr), + u32 __user *regs, + u32 n_regs) +{ + struct i915_oa_reg *oa_regs; + int err; + u32 i; + + if (!n_regs) + return NULL; + + /* No is_valid function means we're not allowing any register to be programmed. */ + GEM_BUG_ON(!is_valid); + if (!is_valid) + return ERR_PTR(-EINVAL); + + oa_regs = kmalloc_array(n_regs, sizeof(*oa_regs), GFP_KERNEL); + if (!oa_regs) + return ERR_PTR(-ENOMEM); + + for (i = 0; i < n_regs; i++) { + u32 addr, value; + + err = get_user(addr, regs); + if (err) + goto addr_err; + + if (!is_valid(perf, addr)) { + drm_dbg(&perf->i915->drm, + "Invalid oa_reg address: %X\n", addr); + err = -EINVAL; + goto addr_err; + } + + err = get_user(value, regs + 1); + if (err) + goto addr_err; + + oa_regs[i].addr = _MMIO(addr); + oa_regs[i].value = mask_reg_value(addr, value); + + regs += 2; + } + + return oa_regs; + +addr_err: + kfree(oa_regs); + return ERR_PTR(err); +} + +static ssize_t show_dynamic_id(struct kobject *kobj, + struct kobj_attribute *attr, + char *buf) +{ + struct i915_oa_config *oa_config = + container_of(attr, typeof(*oa_config), sysfs_metric_id); + + return sprintf(buf, "%d\n", oa_config->id); +} + +static int create_dynamic_oa_sysfs_entry(struct i915_perf *perf, + struct i915_oa_config *oa_config) +{ + sysfs_attr_init(&oa_config->sysfs_metric_id.attr); + oa_config->sysfs_metric_id.attr.name = "id"; + oa_config->sysfs_metric_id.attr.mode = S_IRUGO; + oa_config->sysfs_metric_id.show = show_dynamic_id; + oa_config->sysfs_metric_id.store = NULL; + + oa_config->attrs[0] = &oa_config->sysfs_metric_id.attr; + oa_config->attrs[1] = NULL; + + oa_config->sysfs_metric.name = oa_config->uuid; + oa_config->sysfs_metric.attrs = oa_config->attrs; + + return sysfs_create_group(perf->metrics_kobj, + &oa_config->sysfs_metric); +} + +/** + * i915_perf_add_config_ioctl - DRM ioctl() for userspace to add a new OA config + * @dev: drm device + * @data: ioctl data (pointer to struct drm_i915_perf_oa_config) copied from + * userspace (unvalidated) + * @file: drm file + * + * Validates the submitted OA register to be saved into a new OA config that + * can then be used for programming the OA unit and its NOA network. + * + * Returns: A new allocated config number to be used with the perf open ioctl + * or a negative error code on failure. + */ +int i915_perf_add_config_ioctl(struct drm_device *dev, void *data, + struct drm_file *file) +{ + struct i915_perf *perf = &to_i915(dev)->perf; + struct drm_i915_perf_oa_config *args = data; + struct i915_oa_config *oa_config, *tmp; + struct i915_oa_reg *regs; + int err, id; + + if (!perf->i915) + return -ENOTSUPP; + + if (!perf->metrics_kobj) { + drm_dbg(&perf->i915->drm, + "OA metrics weren't advertised via sysfs\n"); + return -EINVAL; + } + + if (i915_perf_stream_paranoid && !perfmon_capable()) { + drm_dbg(&perf->i915->drm, + "Insufficient privileges to add i915 OA config\n"); + return -EACCES; + } + + if ((!args->mux_regs_ptr || !args->n_mux_regs) && + (!args->boolean_regs_ptr || !args->n_boolean_regs) && + (!args->flex_regs_ptr || !args->n_flex_regs)) { + drm_dbg(&perf->i915->drm, + "No OA registers given\n"); + return -EINVAL; + } + + oa_config = kzalloc(sizeof(*oa_config), GFP_KERNEL); + if (!oa_config) { + drm_dbg(&perf->i915->drm, + "Failed to allocate memory for the OA config\n"); + return -ENOMEM; + } + + oa_config->perf = perf; + kref_init(&oa_config->ref); + + if (!uuid_is_valid(args->uuid)) { + drm_dbg(&perf->i915->drm, + "Invalid uuid format for OA config\n"); + err = -EINVAL; + goto reg_err; + } + + /* Last character in oa_config->uuid will be 0 because oa_config is + * kzalloc. + */ + memcpy(oa_config->uuid, args->uuid, sizeof(args->uuid)); + + oa_config->mux_regs_len = args->n_mux_regs; + regs = alloc_oa_regs(perf, + perf->ops.is_valid_mux_reg, + u64_to_user_ptr(args->mux_regs_ptr), + args->n_mux_regs); + + if (IS_ERR(regs)) { + drm_dbg(&perf->i915->drm, + "Failed to create OA config for mux_regs\n"); + err = PTR_ERR(regs); + goto reg_err; + } + oa_config->mux_regs = regs; + + oa_config->b_counter_regs_len = args->n_boolean_regs; + regs = alloc_oa_regs(perf, + perf->ops.is_valid_b_counter_reg, + u64_to_user_ptr(args->boolean_regs_ptr), + args->n_boolean_regs); + + if (IS_ERR(regs)) { + drm_dbg(&perf->i915->drm, + "Failed to create OA config for b_counter_regs\n"); + err = PTR_ERR(regs); + goto reg_err; + } + oa_config->b_counter_regs = regs; + + if (GRAPHICS_VER(perf->i915) < 8) { + if (args->n_flex_regs != 0) { + err = -EINVAL; + goto reg_err; + } + } else { + oa_config->flex_regs_len = args->n_flex_regs; + regs = alloc_oa_regs(perf, + perf->ops.is_valid_flex_reg, + u64_to_user_ptr(args->flex_regs_ptr), + args->n_flex_regs); + + if (IS_ERR(regs)) { + drm_dbg(&perf->i915->drm, + "Failed to create OA config for flex_regs\n"); + err = PTR_ERR(regs); + goto reg_err; + } + oa_config->flex_regs = regs; + } + + err = mutex_lock_interruptible(&perf->metrics_lock); + if (err) + goto reg_err; + + /* We shouldn't have too many configs, so this iteration shouldn't be + * too costly. + */ + idr_for_each_entry(&perf->metrics_idr, tmp, id) { + if (!strcmp(tmp->uuid, oa_config->uuid)) { + drm_dbg(&perf->i915->drm, + "OA config already exists with this uuid\n"); + err = -EADDRINUSE; + goto sysfs_err; + } + } + + err = create_dynamic_oa_sysfs_entry(perf, oa_config); + if (err) { + drm_dbg(&perf->i915->drm, + "Failed to create sysfs entry for OA config\n"); + goto sysfs_err; + } + + /* Config id 0 is invalid, id 1 for kernel stored test config. */ + oa_config->id = idr_alloc(&perf->metrics_idr, + oa_config, 2, + 0, GFP_KERNEL); + if (oa_config->id < 0) { + drm_dbg(&perf->i915->drm, + "Failed to create sysfs entry for OA config\n"); + err = oa_config->id; + goto sysfs_err; + } + id = oa_config->id; + + drm_dbg(&perf->i915->drm, + "Added config %s id=%i\n", oa_config->uuid, oa_config->id); + mutex_unlock(&perf->metrics_lock); + + return id; + +sysfs_err: + mutex_unlock(&perf->metrics_lock); +reg_err: + i915_oa_config_put(oa_config); + drm_dbg(&perf->i915->drm, + "Failed to add new OA config\n"); + return err; +} + +/** + * i915_perf_remove_config_ioctl - DRM ioctl() for userspace to remove an OA config + * @dev: drm device + * @data: ioctl data (pointer to u64 integer) copied from userspace + * @file: drm file + * + * Configs can be removed while being used, the will stop appearing in sysfs + * and their content will be freed when the stream using the config is closed. + * + * Returns: 0 on success or a negative error code on failure. + */ +int i915_perf_remove_config_ioctl(struct drm_device *dev, void *data, + struct drm_file *file) +{ + struct i915_perf *perf = &to_i915(dev)->perf; + u64 *arg = data; + struct i915_oa_config *oa_config; + int ret; + + if (!perf->i915) + return -ENOTSUPP; + + if (i915_perf_stream_paranoid && !perfmon_capable()) { + drm_dbg(&perf->i915->drm, + "Insufficient privileges to remove i915 OA config\n"); + return -EACCES; + } + + ret = mutex_lock_interruptible(&perf->metrics_lock); + if (ret) + return ret; + + oa_config = idr_find(&perf->metrics_idr, *arg); + if (!oa_config) { + drm_dbg(&perf->i915->drm, + "Failed to remove unknown OA config\n"); + ret = -ENOENT; + goto err_unlock; + } + + GEM_BUG_ON(*arg != oa_config->id); + + sysfs_remove_group(perf->metrics_kobj, &oa_config->sysfs_metric); + + idr_remove(&perf->metrics_idr, *arg); + + mutex_unlock(&perf->metrics_lock); + + drm_dbg(&perf->i915->drm, + "Removed config %s id=%i\n", oa_config->uuid, oa_config->id); + + i915_oa_config_put(oa_config); + + return 0; + +err_unlock: + mutex_unlock(&perf->metrics_lock); + return ret; +} + +static struct ctl_table oa_table[] = { + { + .procname = "perf_stream_paranoid", + .data = &i915_perf_stream_paranoid, + .maxlen = sizeof(i915_perf_stream_paranoid), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = SYSCTL_ZERO, + .extra2 = SYSCTL_ONE, + }, + { + .procname = "oa_max_sample_rate", + .data = &i915_oa_max_sample_rate, + .maxlen = sizeof(i915_oa_max_sample_rate), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = SYSCTL_ZERO, + .extra2 = &oa_sample_rate_hard_limit, + }, + {} +}; + +static void oa_init_supported_formats(struct i915_perf *perf) +{ + struct drm_i915_private *i915 = perf->i915; + enum intel_platform platform = INTEL_INFO(i915)->platform; + + switch (platform) { + case INTEL_HASWELL: + oa_format_add(perf, I915_OA_FORMAT_A13); + oa_format_add(perf, I915_OA_FORMAT_A13); + oa_format_add(perf, I915_OA_FORMAT_A29); + oa_format_add(perf, I915_OA_FORMAT_A13_B8_C8); + oa_format_add(perf, I915_OA_FORMAT_B4_C8); + oa_format_add(perf, I915_OA_FORMAT_A45_B8_C8); + oa_format_add(perf, I915_OA_FORMAT_B4_C8_A16); + oa_format_add(perf, I915_OA_FORMAT_C4_B8); + break; + + case INTEL_BROADWELL: + case INTEL_CHERRYVIEW: + case INTEL_SKYLAKE: + case INTEL_BROXTON: + case INTEL_KABYLAKE: + case INTEL_GEMINILAKE: + case INTEL_COFFEELAKE: + case INTEL_COMETLAKE: + case INTEL_ICELAKE: + case INTEL_ELKHARTLAKE: + case INTEL_JASPERLAKE: + case INTEL_TIGERLAKE: + case INTEL_ROCKETLAKE: + case INTEL_DG1: + case INTEL_ALDERLAKE_S: + case INTEL_ALDERLAKE_P: + oa_format_add(perf, I915_OA_FORMAT_A12); + oa_format_add(perf, I915_OA_FORMAT_A12_B8_C8); + oa_format_add(perf, I915_OA_FORMAT_A32u40_A4u32_B8_C8); + oa_format_add(perf, I915_OA_FORMAT_C4_B8); + break; + + default: + MISSING_CASE(platform); + } +} + +/** + * i915_perf_init - initialize i915-perf state on module bind + * @i915: i915 device instance + * + * Initializes i915-perf state without exposing anything to userspace. + * + * Note: i915-perf initialization is split into an 'init' and 'register' + * phase with the i915_perf_register() exposing state to userspace. + */ +void i915_perf_init(struct drm_i915_private *i915) +{ + struct i915_perf *perf = &i915->perf; + + /* XXX const struct i915_perf_ops! */ + + /* i915_perf is not enabled for DG2 yet */ + if (IS_DG2(i915)) + return; + + perf->oa_formats = oa_formats; + if (IS_HASWELL(i915)) { + perf->ops.is_valid_b_counter_reg = gen7_is_valid_b_counter_addr; + perf->ops.is_valid_mux_reg = hsw_is_valid_mux_addr; + perf->ops.is_valid_flex_reg = NULL; + perf->ops.enable_metric_set = hsw_enable_metric_set; + perf->ops.disable_metric_set = hsw_disable_metric_set; + perf->ops.oa_enable = gen7_oa_enable; + perf->ops.oa_disable = gen7_oa_disable; + perf->ops.read = gen7_oa_read; + perf->ops.oa_hw_tail_read = gen7_oa_hw_tail_read; + } else if (HAS_LOGICAL_RING_CONTEXTS(i915)) { + /* Note: that although we could theoretically also support the + * legacy ringbuffer mode on BDW (and earlier iterations of + * this driver, before upstreaming did this) it didn't seem + * worth the complexity to maintain now that BDW+ enable + * execlist mode by default. + */ + perf->ops.read = gen8_oa_read; + + if (IS_GRAPHICS_VER(i915, 8, 9)) { + perf->ops.is_valid_b_counter_reg = + gen7_is_valid_b_counter_addr; + perf->ops.is_valid_mux_reg = + gen8_is_valid_mux_addr; + perf->ops.is_valid_flex_reg = + gen8_is_valid_flex_addr; + + if (IS_CHERRYVIEW(i915)) { + perf->ops.is_valid_mux_reg = + chv_is_valid_mux_addr; + } + + perf->ops.oa_enable = gen8_oa_enable; + perf->ops.oa_disable = gen8_oa_disable; + perf->ops.enable_metric_set = gen8_enable_metric_set; + perf->ops.disable_metric_set = gen8_disable_metric_set; + perf->ops.oa_hw_tail_read = gen8_oa_hw_tail_read; + + if (GRAPHICS_VER(i915) == 8) { + perf->ctx_oactxctrl_offset = 0x120; + perf->ctx_flexeu0_offset = 0x2ce; + + perf->gen8_valid_ctx_bit = BIT(25); + } else { + perf->ctx_oactxctrl_offset = 0x128; + perf->ctx_flexeu0_offset = 0x3de; + + perf->gen8_valid_ctx_bit = BIT(16); + } + } else if (GRAPHICS_VER(i915) == 11) { + perf->ops.is_valid_b_counter_reg = + gen7_is_valid_b_counter_addr; + perf->ops.is_valid_mux_reg = + gen11_is_valid_mux_addr; + perf->ops.is_valid_flex_reg = + gen8_is_valid_flex_addr; + + perf->ops.oa_enable = gen8_oa_enable; + perf->ops.oa_disable = gen8_oa_disable; + perf->ops.enable_metric_set = gen8_enable_metric_set; + perf->ops.disable_metric_set = gen11_disable_metric_set; + perf->ops.oa_hw_tail_read = gen8_oa_hw_tail_read; + + perf->ctx_oactxctrl_offset = 0x124; + perf->ctx_flexeu0_offset = 0x78e; + + perf->gen8_valid_ctx_bit = BIT(16); + } else if (GRAPHICS_VER(i915) == 12) { + perf->ops.is_valid_b_counter_reg = + gen12_is_valid_b_counter_addr; + perf->ops.is_valid_mux_reg = + gen12_is_valid_mux_addr; + perf->ops.is_valid_flex_reg = + gen8_is_valid_flex_addr; + + perf->ops.oa_enable = gen12_oa_enable; + perf->ops.oa_disable = gen12_oa_disable; + perf->ops.enable_metric_set = gen12_enable_metric_set; + perf->ops.disable_metric_set = gen12_disable_metric_set; + perf->ops.oa_hw_tail_read = gen12_oa_hw_tail_read; + + perf->ctx_flexeu0_offset = 0; + perf->ctx_oactxctrl_offset = 0x144; + } + } + + if (perf->ops.enable_metric_set) { + mutex_init(&perf->lock); + + /* Choose a representative limit */ + oa_sample_rate_hard_limit = to_gt(i915)->clock_frequency / 2; + + mutex_init(&perf->metrics_lock); + idr_init_base(&perf->metrics_idr, 1); + + /* We set up some ratelimit state to potentially throttle any + * _NOTES about spurious, invalid OA reports which we don't + * forward to userspace. + * + * We print a _NOTE about any throttling when closing the + * stream instead of waiting until driver _fini which no one + * would ever see. + * + * Using the same limiting factors as printk_ratelimit() + */ + ratelimit_state_init(&perf->spurious_report_rs, 5 * HZ, 10); + /* Since we use a DRM_NOTE for spurious reports it would be + * inconsistent to let __ratelimit() automatically print a + * warning for throttling. + */ + ratelimit_set_flags(&perf->spurious_report_rs, + RATELIMIT_MSG_ON_RELEASE); + + ratelimit_state_init(&perf->tail_pointer_race, + 5 * HZ, 10); + ratelimit_set_flags(&perf->tail_pointer_race, + RATELIMIT_MSG_ON_RELEASE); + + atomic64_set(&perf->noa_programming_delay, + 500 * 1000 /* 500us */); + + perf->i915 = i915; + + oa_init_supported_formats(perf); + } +} + +static int destroy_config(int id, void *p, void *data) +{ + i915_oa_config_put(p); + return 0; +} + +int i915_perf_sysctl_register(void) +{ + sysctl_header = register_sysctl("dev/i915", oa_table); + return 0; +} + +void i915_perf_sysctl_unregister(void) +{ + unregister_sysctl_table(sysctl_header); +} + +/** + * i915_perf_fini - Counter part to i915_perf_init() + * @i915: i915 device instance + */ +void i915_perf_fini(struct drm_i915_private *i915) +{ + struct i915_perf *perf = &i915->perf; + + if (!perf->i915) + return; + + idr_for_each(&perf->metrics_idr, destroy_config, perf); + idr_destroy(&perf->metrics_idr); + + memset(&perf->ops, 0, sizeof(perf->ops)); + perf->i915 = NULL; +} + +/** + * i915_perf_ioctl_version - Version of the i915-perf subsystem + * + * This version number is used by userspace to detect available features. + */ +int i915_perf_ioctl_version(void) +{ + /* + * 1: Initial version + * I915_PERF_IOCTL_ENABLE + * I915_PERF_IOCTL_DISABLE + * + * 2: Added runtime modification of OA config. + * I915_PERF_IOCTL_CONFIG + * + * 3: Add DRM_I915_PERF_PROP_HOLD_PREEMPTION parameter to hold + * preemption on a particular context so that performance data is + * accessible from a delta of MI_RPC reports without looking at the + * OA buffer. + * + * 4: Add DRM_I915_PERF_PROP_ALLOWED_SSEU to limit what contexts can + * be run for the duration of the performance recording based on + * their SSEU configuration. + * + * 5: Add DRM_I915_PERF_PROP_POLL_OA_PERIOD parameter that controls the + * interval for the hrtimer used to check for OA data. + */ + return 5; +} + +#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST) +#include "selftests/i915_perf.c" +#endif |