diff options
Diffstat (limited to 'drivers/gpu/drm/i915/gt/uc/intel_guc_log.c')
| -rw-r--r-- | drivers/gpu/drm/i915/gt/uc/intel_guc_log.c | 932 |
1 files changed, 932 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_log.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_log.c new file mode 100644 index 0000000000..55bc8b55fb --- /dev/null +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_log.c @@ -0,0 +1,932 @@ +// SPDX-License-Identifier: MIT +/* + * Copyright © 2014-2019 Intel Corporation + */ + +#include <linux/debugfs.h> +#include <linux/string_helpers.h> + +#include "gt/intel_gt.h" +#include "i915_drv.h" +#include "i915_irq.h" +#include "i915_memcpy.h" +#include "intel_guc_capture.h" +#include "intel_guc_log.h" +#include "intel_guc_print.h" + +#if defined(CONFIG_DRM_I915_DEBUG_GUC) +#define GUC_LOG_DEFAULT_CRASH_BUFFER_SIZE SZ_2M +#define GUC_LOG_DEFAULT_DEBUG_BUFFER_SIZE SZ_16M +#define GUC_LOG_DEFAULT_CAPTURE_BUFFER_SIZE SZ_1M +#elif defined(CONFIG_DRM_I915_DEBUG_GEM) +#define GUC_LOG_DEFAULT_CRASH_BUFFER_SIZE SZ_1M +#define GUC_LOG_DEFAULT_DEBUG_BUFFER_SIZE SZ_2M +#define GUC_LOG_DEFAULT_CAPTURE_BUFFER_SIZE SZ_1M +#else +#define GUC_LOG_DEFAULT_CRASH_BUFFER_SIZE SZ_8K +#define GUC_LOG_DEFAULT_DEBUG_BUFFER_SIZE SZ_64K +#define GUC_LOG_DEFAULT_CAPTURE_BUFFER_SIZE SZ_1M +#endif + +static void guc_log_copy_debuglogs_for_relay(struct intel_guc_log *log); + +struct guc_log_section { + u32 max; + u32 flag; + u32 default_val; + const char *name; +}; + +static void _guc_log_init_sizes(struct intel_guc_log *log) +{ + struct intel_guc *guc = log_to_guc(log); + static const struct guc_log_section sections[GUC_LOG_SECTIONS_LIMIT] = { + { + GUC_LOG_CRASH_MASK >> GUC_LOG_CRASH_SHIFT, + GUC_LOG_LOG_ALLOC_UNITS, + GUC_LOG_DEFAULT_CRASH_BUFFER_SIZE, + "crash dump" + }, + { + GUC_LOG_DEBUG_MASK >> GUC_LOG_DEBUG_SHIFT, + GUC_LOG_LOG_ALLOC_UNITS, + GUC_LOG_DEFAULT_DEBUG_BUFFER_SIZE, + "debug", + }, + { + GUC_LOG_CAPTURE_MASK >> GUC_LOG_CAPTURE_SHIFT, + GUC_LOG_CAPTURE_ALLOC_UNITS, + GUC_LOG_DEFAULT_CAPTURE_BUFFER_SIZE, + "capture", + } + }; + int i; + + for (i = 0; i < GUC_LOG_SECTIONS_LIMIT; i++) + log->sizes[i].bytes = sections[i].default_val; + + /* If debug size > 1MB then bump default crash size to keep the same units */ + if (log->sizes[GUC_LOG_SECTIONS_DEBUG].bytes >= SZ_1M && + GUC_LOG_DEFAULT_CRASH_BUFFER_SIZE < SZ_1M) + log->sizes[GUC_LOG_SECTIONS_CRASH].bytes = SZ_1M; + + /* Prepare the GuC API structure fields: */ + for (i = 0; i < GUC_LOG_SECTIONS_LIMIT; i++) { + /* Convert to correct units */ + if ((log->sizes[i].bytes % SZ_1M) == 0) { + log->sizes[i].units = SZ_1M; + log->sizes[i].flag = sections[i].flag; + } else { + log->sizes[i].units = SZ_4K; + log->sizes[i].flag = 0; + } + + if (!IS_ALIGNED(log->sizes[i].bytes, log->sizes[i].units)) + guc_err(guc, "Mis-aligned log %s size: 0x%X vs 0x%X!\n", + sections[i].name, log->sizes[i].bytes, log->sizes[i].units); + log->sizes[i].count = log->sizes[i].bytes / log->sizes[i].units; + + if (!log->sizes[i].count) { + guc_err(guc, "Zero log %s size!\n", sections[i].name); + } else { + /* Size is +1 unit */ + log->sizes[i].count--; + } + + /* Clip to field size */ + if (log->sizes[i].count > sections[i].max) { + guc_err(guc, "log %s size too large: %d vs %d!\n", + sections[i].name, log->sizes[i].count + 1, sections[i].max + 1); + log->sizes[i].count = sections[i].max; + } + } + + if (log->sizes[GUC_LOG_SECTIONS_CRASH].units != log->sizes[GUC_LOG_SECTIONS_DEBUG].units) { + guc_err(guc, "Unit mismatch for crash and debug sections: %d vs %d!\n", + log->sizes[GUC_LOG_SECTIONS_CRASH].units, + log->sizes[GUC_LOG_SECTIONS_DEBUG].units); + log->sizes[GUC_LOG_SECTIONS_CRASH].units = log->sizes[GUC_LOG_SECTIONS_DEBUG].units; + log->sizes[GUC_LOG_SECTIONS_CRASH].count = 0; + } + + log->sizes_initialised = true; +} + +static void guc_log_init_sizes(struct intel_guc_log *log) +{ + if (log->sizes_initialised) + return; + + _guc_log_init_sizes(log); +} + +static u32 intel_guc_log_section_size_crash(struct intel_guc_log *log) +{ + guc_log_init_sizes(log); + + return log->sizes[GUC_LOG_SECTIONS_CRASH].bytes; +} + +static u32 intel_guc_log_section_size_debug(struct intel_guc_log *log) +{ + guc_log_init_sizes(log); + + return log->sizes[GUC_LOG_SECTIONS_DEBUG].bytes; +} + +u32 intel_guc_log_section_size_capture(struct intel_guc_log *log) +{ + guc_log_init_sizes(log); + + return log->sizes[GUC_LOG_SECTIONS_CAPTURE].bytes; +} + +static u32 intel_guc_log_size(struct intel_guc_log *log) +{ + /* + * GuC Log buffer Layout: + * + * NB: Ordering must follow "enum guc_log_buffer_type". + * + * +===============================+ 00B + * | Debug state header | + * +-------------------------------+ 32B + * | Crash dump state header | + * +-------------------------------+ 64B + * | Capture state header | + * +-------------------------------+ 96B + * | | + * +===============================+ PAGE_SIZE (4KB) + * | Debug logs | + * +===============================+ + DEBUG_SIZE + * | Crash Dump logs | + * +===============================+ + CRASH_SIZE + * | Capture logs | + * +===============================+ + CAPTURE_SIZE + */ + return PAGE_SIZE + + intel_guc_log_section_size_crash(log) + + intel_guc_log_section_size_debug(log) + + intel_guc_log_section_size_capture(log); +} + +/** + * DOC: GuC firmware log + * + * Firmware log is enabled by setting i915.guc_log_level to the positive level. + * Log data is printed out via reading debugfs i915_guc_log_dump. Reading from + * i915_guc_load_status will print out firmware loading status and scratch + * registers value. + */ + +static int guc_action_flush_log_complete(struct intel_guc *guc) +{ + u32 action[] = { + INTEL_GUC_ACTION_LOG_BUFFER_FILE_FLUSH_COMPLETE, + GUC_DEBUG_LOG_BUFFER + }; + + return intel_guc_send_nb(guc, action, ARRAY_SIZE(action), 0); +} + +static int guc_action_flush_log(struct intel_guc *guc) +{ + u32 action[] = { + INTEL_GUC_ACTION_FORCE_LOG_BUFFER_FLUSH, + 0 + }; + + return intel_guc_send(guc, action, ARRAY_SIZE(action)); +} + +static int guc_action_control_log(struct intel_guc *guc, bool enable, + bool default_logging, u32 verbosity) +{ + u32 action[] = { + INTEL_GUC_ACTION_UK_LOG_ENABLE_LOGGING, + (enable ? GUC_LOG_CONTROL_LOGGING_ENABLED : 0) | + (verbosity << GUC_LOG_CONTROL_VERBOSITY_SHIFT) | + (default_logging ? GUC_LOG_CONTROL_DEFAULT_LOGGING : 0) + }; + + GEM_BUG_ON(verbosity > GUC_LOG_VERBOSITY_MAX); + + return intel_guc_send(guc, action, ARRAY_SIZE(action)); +} + +/* + * Sub buffer switch callback. Called whenever relay has to switch to a new + * sub buffer, relay stays on the same sub buffer if 0 is returned. + */ +static int subbuf_start_callback(struct rchan_buf *buf, + void *subbuf, + void *prev_subbuf, + size_t prev_padding) +{ + /* + * Use no-overwrite mode by default, where relay will stop accepting + * new data if there are no empty sub buffers left. + * There is no strict synchronization enforced by relay between Consumer + * and Producer. In overwrite mode, there is a possibility of getting + * inconsistent/garbled data, the producer could be writing on to the + * same sub buffer from which Consumer is reading. This can't be avoided + * unless Consumer is fast enough and can always run in tandem with + * Producer. + */ + if (relay_buf_full(buf)) + return 0; + + return 1; +} + +/* + * file_create() callback. Creates relay file in debugfs. + */ +static struct dentry *create_buf_file_callback(const char *filename, + struct dentry *parent, + umode_t mode, + struct rchan_buf *buf, + int *is_global) +{ + struct dentry *buf_file; + + /* + * This to enable the use of a single buffer for the relay channel and + * correspondingly have a single file exposed to User, through which + * it can collect the logs in order without any post-processing. + * Need to set 'is_global' even if parent is NULL for early logging. + */ + *is_global = 1; + + if (!parent) + return NULL; + + buf_file = debugfs_create_file(filename, mode, + parent, buf, &relay_file_operations); + if (IS_ERR(buf_file)) + return NULL; + + return buf_file; +} + +/* + * file_remove() default callback. Removes relay file in debugfs. + */ +static int remove_buf_file_callback(struct dentry *dentry) +{ + debugfs_remove(dentry); + return 0; +} + +/* relay channel callbacks */ +static const struct rchan_callbacks relay_callbacks = { + .subbuf_start = subbuf_start_callback, + .create_buf_file = create_buf_file_callback, + .remove_buf_file = remove_buf_file_callback, +}; + +static void guc_move_to_next_buf(struct intel_guc_log *log) +{ + /* + * Make sure the updates made in the sub buffer are visible when + * Consumer sees the following update to offset inside the sub buffer. + */ + smp_wmb(); + + /* All data has been written, so now move the offset of sub buffer. */ + relay_reserve(log->relay.channel, log->vma->obj->base.size - + intel_guc_log_section_size_capture(log)); + + /* Switch to the next sub buffer */ + relay_flush(log->relay.channel); +} + +static void *guc_get_write_buffer(struct intel_guc_log *log) +{ + /* + * Just get the base address of a new sub buffer and copy data into it + * ourselves. NULL will be returned in no-overwrite mode, if all sub + * buffers are full. Could have used the relay_write() to indirectly + * copy the data, but that would have been bit convoluted, as we need to + * write to only certain locations inside a sub buffer which cannot be + * done without using relay_reserve() along with relay_write(). So its + * better to use relay_reserve() alone. + */ + return relay_reserve(log->relay.channel, 0); +} + +bool intel_guc_check_log_buf_overflow(struct intel_guc_log *log, + enum guc_log_buffer_type type, + unsigned int full_cnt) +{ + unsigned int prev_full_cnt = log->stats[type].sampled_overflow; + bool overflow = false; + + if (full_cnt != prev_full_cnt) { + overflow = true; + + log->stats[type].overflow = full_cnt; + log->stats[type].sampled_overflow += full_cnt - prev_full_cnt; + + if (full_cnt < prev_full_cnt) { + /* buffer_full_cnt is a 4 bit counter */ + log->stats[type].sampled_overflow += 16; + } + + guc_notice_ratelimited(log_to_guc(log), "log buffer overflow\n"); + } + + return overflow; +} + +unsigned int intel_guc_get_log_buffer_size(struct intel_guc_log *log, + enum guc_log_buffer_type type) +{ + switch (type) { + case GUC_DEBUG_LOG_BUFFER: + return intel_guc_log_section_size_debug(log); + case GUC_CRASH_DUMP_LOG_BUFFER: + return intel_guc_log_section_size_crash(log); + case GUC_CAPTURE_LOG_BUFFER: + return intel_guc_log_section_size_capture(log); + default: + MISSING_CASE(type); + } + + return 0; +} + +size_t intel_guc_get_log_buffer_offset(struct intel_guc_log *log, + enum guc_log_buffer_type type) +{ + enum guc_log_buffer_type i; + size_t offset = PAGE_SIZE;/* for the log_buffer_states */ + + for (i = GUC_DEBUG_LOG_BUFFER; i < GUC_MAX_LOG_BUFFER; ++i) { + if (i == type) + break; + offset += intel_guc_get_log_buffer_size(log, i); + } + + return offset; +} + +static void _guc_log_copy_debuglogs_for_relay(struct intel_guc_log *log) +{ + struct intel_guc *guc = log_to_guc(log); + unsigned int buffer_size, read_offset, write_offset, bytes_to_copy, full_cnt; + struct guc_log_buffer_state *log_buf_state, *log_buf_snapshot_state; + struct guc_log_buffer_state log_buf_state_local; + enum guc_log_buffer_type type; + void *src_data, *dst_data; + bool new_overflow; + + mutex_lock(&log->relay.lock); + + if (guc_WARN_ON(guc, !intel_guc_log_relay_created(log))) + goto out_unlock; + + /* Get the pointer to shared GuC log buffer */ + src_data = log->buf_addr; + log_buf_state = src_data; + + /* Get the pointer to local buffer to store the logs */ + log_buf_snapshot_state = dst_data = guc_get_write_buffer(log); + + if (unlikely(!log_buf_snapshot_state)) { + /* + * Used rate limited to avoid deluge of messages, logs might be + * getting consumed by User at a slow rate. + */ + guc_err_ratelimited(guc, "no sub-buffer to copy general logs\n"); + log->relay.full_count++; + + goto out_unlock; + } + + /* Actual logs are present from the 2nd page */ + src_data += PAGE_SIZE; + dst_data += PAGE_SIZE; + + /* For relay logging, we exclude error state capture */ + for (type = GUC_DEBUG_LOG_BUFFER; type <= GUC_CRASH_DUMP_LOG_BUFFER; type++) { + /* + * Make a copy of the state structure, inside GuC log buffer + * (which is uncached mapped), on the stack to avoid reading + * from it multiple times. + */ + memcpy(&log_buf_state_local, log_buf_state, + sizeof(struct guc_log_buffer_state)); + buffer_size = intel_guc_get_log_buffer_size(log, type); + read_offset = log_buf_state_local.read_ptr; + write_offset = log_buf_state_local.sampled_write_ptr; + full_cnt = log_buf_state_local.buffer_full_cnt; + + /* Bookkeeping stuff */ + log->stats[type].flush += log_buf_state_local.flush_to_file; + new_overflow = intel_guc_check_log_buf_overflow(log, type, full_cnt); + + /* Update the state of shared log buffer */ + log_buf_state->read_ptr = write_offset; + log_buf_state->flush_to_file = 0; + log_buf_state++; + + /* First copy the state structure in snapshot buffer */ + memcpy(log_buf_snapshot_state, &log_buf_state_local, + sizeof(struct guc_log_buffer_state)); + + /* + * The write pointer could have been updated by GuC firmware, + * after sending the flush interrupt to Host, for consistency + * set write pointer value to same value of sampled_write_ptr + * in the snapshot buffer. + */ + log_buf_snapshot_state->write_ptr = write_offset; + log_buf_snapshot_state++; + + /* Now copy the actual logs. */ + if (unlikely(new_overflow)) { + /* copy the whole buffer in case of overflow */ + read_offset = 0; + write_offset = buffer_size; + } else if (unlikely((read_offset > buffer_size) || + (write_offset > buffer_size))) { + guc_err(guc, "invalid log buffer state\n"); + /* copy whole buffer as offsets are unreliable */ + read_offset = 0; + write_offset = buffer_size; + } + + /* Just copy the newly written data */ + if (read_offset > write_offset) { + i915_memcpy_from_wc(dst_data, src_data, write_offset); + bytes_to_copy = buffer_size - read_offset; + } else { + bytes_to_copy = write_offset - read_offset; + } + i915_memcpy_from_wc(dst_data + read_offset, + src_data + read_offset, bytes_to_copy); + + src_data += buffer_size; + dst_data += buffer_size; + } + + guc_move_to_next_buf(log); + +out_unlock: + mutex_unlock(&log->relay.lock); +} + +static void copy_debug_logs_work(struct work_struct *work) +{ + struct intel_guc_log *log = + container_of(work, struct intel_guc_log, relay.flush_work); + + guc_log_copy_debuglogs_for_relay(log); +} + +static int guc_log_relay_map(struct intel_guc_log *log) +{ + lockdep_assert_held(&log->relay.lock); + + if (!log->vma || !log->buf_addr) + return -ENODEV; + + /* + * WC vmalloc mapping of log buffer pages was done at + * GuC Log Init time, but lets keep a ref for book-keeping + */ + i915_gem_object_get(log->vma->obj); + log->relay.buf_in_use = true; + + return 0; +} + +static void guc_log_relay_unmap(struct intel_guc_log *log) +{ + lockdep_assert_held(&log->relay.lock); + + i915_gem_object_put(log->vma->obj); + log->relay.buf_in_use = false; +} + +void intel_guc_log_init_early(struct intel_guc_log *log) +{ + mutex_init(&log->relay.lock); + INIT_WORK(&log->relay.flush_work, copy_debug_logs_work); + log->relay.started = false; +} + +static int guc_log_relay_create(struct intel_guc_log *log) +{ + struct intel_guc *guc = log_to_guc(log); + struct drm_i915_private *i915 = guc_to_gt(guc)->i915; + struct rchan *guc_log_relay_chan; + size_t n_subbufs, subbuf_size; + int ret; + + lockdep_assert_held(&log->relay.lock); + GEM_BUG_ON(!log->vma); + + /* + * Keep the size of sub buffers same as shared log buffer + * but GuC log-events excludes the error-state-capture logs + */ + subbuf_size = log->vma->size - intel_guc_log_section_size_capture(log); + + /* + * Store up to 8 snapshots, which is large enough to buffer sufficient + * boot time logs and provides enough leeway to User, in terms of + * latency, for consuming the logs from relay. Also doesn't take + * up too much memory. + */ + n_subbufs = 8; + + if (!guc->dbgfs_node) + return -ENOENT; + + guc_log_relay_chan = relay_open("guc_log", + guc->dbgfs_node, + subbuf_size, n_subbufs, + &relay_callbacks, i915); + if (!guc_log_relay_chan) { + guc_err(guc, "Couldn't create relay channel for logging\n"); + + ret = -ENOMEM; + return ret; + } + + GEM_BUG_ON(guc_log_relay_chan->subbuf_size < subbuf_size); + log->relay.channel = guc_log_relay_chan; + + return 0; +} + +static void guc_log_relay_destroy(struct intel_guc_log *log) +{ + lockdep_assert_held(&log->relay.lock); + + relay_close(log->relay.channel); + log->relay.channel = NULL; +} + +static void guc_log_copy_debuglogs_for_relay(struct intel_guc_log *log) +{ + struct intel_guc *guc = log_to_guc(log); + struct drm_i915_private *i915 = guc_to_gt(guc)->i915; + intel_wakeref_t wakeref; + + _guc_log_copy_debuglogs_for_relay(log); + + /* + * Generally device is expected to be active only at this + * time, so get/put should be really quick. + */ + with_intel_runtime_pm(&i915->runtime_pm, wakeref) + guc_action_flush_log_complete(guc); +} + +static u32 __get_default_log_level(struct intel_guc_log *log) +{ + struct intel_guc *guc = log_to_guc(log); + struct drm_i915_private *i915 = guc_to_gt(guc)->i915; + + /* A negative value means "use platform/config default" */ + if (i915->params.guc_log_level < 0) { + return (IS_ENABLED(CONFIG_DRM_I915_DEBUG) || + IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM)) ? + GUC_LOG_LEVEL_MAX : GUC_LOG_LEVEL_NON_VERBOSE; + } + + if (i915->params.guc_log_level > GUC_LOG_LEVEL_MAX) { + guc_warn(guc, "Log verbosity param out of range: %d > %d!\n", + i915->params.guc_log_level, GUC_LOG_LEVEL_MAX); + return (IS_ENABLED(CONFIG_DRM_I915_DEBUG) || + IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM)) ? + GUC_LOG_LEVEL_MAX : GUC_LOG_LEVEL_DISABLED; + } + + GEM_BUG_ON(i915->params.guc_log_level < GUC_LOG_LEVEL_DISABLED); + GEM_BUG_ON(i915->params.guc_log_level > GUC_LOG_LEVEL_MAX); + return i915->params.guc_log_level; +} + +int intel_guc_log_create(struct intel_guc_log *log) +{ + struct intel_guc *guc = log_to_guc(log); + struct i915_vma *vma; + void *vaddr; + u32 guc_log_size; + int ret; + + GEM_BUG_ON(log->vma); + + guc_log_size = intel_guc_log_size(log); + + vma = intel_guc_allocate_vma(guc, guc_log_size); + if (IS_ERR(vma)) { + ret = PTR_ERR(vma); + goto err; + } + + log->vma = vma; + /* + * Create a WC (Uncached for read) vmalloc mapping up front immediate access to + * data from memory during critical events such as error capture + */ + vaddr = i915_gem_object_pin_map_unlocked(log->vma->obj, I915_MAP_WC); + if (IS_ERR(vaddr)) { + ret = PTR_ERR(vaddr); + i915_vma_unpin_and_release(&log->vma, 0); + goto err; + } + log->buf_addr = vaddr; + + log->level = __get_default_log_level(log); + guc_dbg(guc, "guc_log_level=%d (%s, verbose:%s, verbosity:%d)\n", + log->level, str_enabled_disabled(log->level), + str_yes_no(GUC_LOG_LEVEL_IS_VERBOSE(log->level)), + GUC_LOG_LEVEL_TO_VERBOSITY(log->level)); + + return 0; + +err: + guc_err(guc, "Failed to allocate or map log buffer %pe\n", ERR_PTR(ret)); + return ret; +} + +void intel_guc_log_destroy(struct intel_guc_log *log) +{ + log->buf_addr = NULL; + i915_vma_unpin_and_release(&log->vma, I915_VMA_RELEASE_MAP); +} + +int intel_guc_log_set_level(struct intel_guc_log *log, u32 level) +{ + struct intel_guc *guc = log_to_guc(log); + struct drm_i915_private *i915 = guc_to_gt(guc)->i915; + intel_wakeref_t wakeref; + int ret = 0; + + BUILD_BUG_ON(GUC_LOG_VERBOSITY_MIN != 0); + GEM_BUG_ON(!log->vma); + + /* + * GuC is recognizing log levels starting from 0 to max, we're using 0 + * as indication that logging should be disabled. + */ + if (level < GUC_LOG_LEVEL_DISABLED || level > GUC_LOG_LEVEL_MAX) + return -EINVAL; + + mutex_lock(&i915->drm.struct_mutex); + + if (log->level == level) + goto out_unlock; + + with_intel_runtime_pm(&i915->runtime_pm, wakeref) + ret = guc_action_control_log(guc, + GUC_LOG_LEVEL_IS_VERBOSE(level), + GUC_LOG_LEVEL_IS_ENABLED(level), + GUC_LOG_LEVEL_TO_VERBOSITY(level)); + if (ret) { + guc_dbg(guc, "guc_log_control action failed %pe\n", ERR_PTR(ret)); + goto out_unlock; + } + + log->level = level; + +out_unlock: + mutex_unlock(&i915->drm.struct_mutex); + + return ret; +} + +bool intel_guc_log_relay_created(const struct intel_guc_log *log) +{ + return log->buf_addr; +} + +int intel_guc_log_relay_open(struct intel_guc_log *log) +{ + int ret; + + if (!log->vma) + return -ENODEV; + + mutex_lock(&log->relay.lock); + + if (intel_guc_log_relay_created(log)) { + ret = -EEXIST; + goto out_unlock; + } + + /* + * We require SSE 4.1 for fast reads from the GuC log buffer and + * it should be present on the chipsets supporting GuC based + * submissions. + */ + if (!i915_has_memcpy_from_wc()) { + ret = -ENXIO; + goto out_unlock; + } + + ret = guc_log_relay_create(log); + if (ret) + goto out_unlock; + + ret = guc_log_relay_map(log); + if (ret) + goto out_relay; + + mutex_unlock(&log->relay.lock); + + return 0; + +out_relay: + guc_log_relay_destroy(log); +out_unlock: + mutex_unlock(&log->relay.lock); + + return ret; +} + +int intel_guc_log_relay_start(struct intel_guc_log *log) +{ + if (log->relay.started) + return -EEXIST; + + /* + * When GuC is logging without us relaying to userspace, we're ignoring + * the flush notification. This means that we need to unconditionally + * flush on relay enabling, since GuC only notifies us once. + */ + queue_work(system_highpri_wq, &log->relay.flush_work); + + log->relay.started = true; + + return 0; +} + +void intel_guc_log_relay_flush(struct intel_guc_log *log) +{ + struct intel_guc *guc = log_to_guc(log); + intel_wakeref_t wakeref; + + if (!log->relay.started) + return; + + /* + * Before initiating the forceful flush, wait for any pending/ongoing + * flush to complete otherwise forceful flush may not actually happen. + */ + flush_work(&log->relay.flush_work); + + with_intel_runtime_pm(guc_to_gt(guc)->uncore->rpm, wakeref) + guc_action_flush_log(guc); + + /* GuC would have updated log buffer by now, so copy it */ + guc_log_copy_debuglogs_for_relay(log); +} + +/* + * Stops the relay log. Called from intel_guc_log_relay_close(), so no + * possibility of race with start/flush since relay_write cannot race + * relay_close. + */ +static void guc_log_relay_stop(struct intel_guc_log *log) +{ + struct intel_guc *guc = log_to_guc(log); + struct drm_i915_private *i915 = guc_to_gt(guc)->i915; + + if (!log->relay.started) + return; + + intel_synchronize_irq(i915); + + flush_work(&log->relay.flush_work); + + log->relay.started = false; +} + +void intel_guc_log_relay_close(struct intel_guc_log *log) +{ + guc_log_relay_stop(log); + + mutex_lock(&log->relay.lock); + GEM_BUG_ON(!intel_guc_log_relay_created(log)); + guc_log_relay_unmap(log); + guc_log_relay_destroy(log); + mutex_unlock(&log->relay.lock); +} + +void intel_guc_log_handle_flush_event(struct intel_guc_log *log) +{ + if (log->relay.started) + queue_work(system_highpri_wq, &log->relay.flush_work); +} + +static const char * +stringify_guc_log_type(enum guc_log_buffer_type type) +{ + switch (type) { + case GUC_DEBUG_LOG_BUFFER: + return "DEBUG"; + case GUC_CRASH_DUMP_LOG_BUFFER: + return "CRASH"; + case GUC_CAPTURE_LOG_BUFFER: + return "CAPTURE"; + default: + MISSING_CASE(type); + } + + return ""; +} + +/** + * intel_guc_log_info - dump information about GuC log relay + * @log: the GuC log + * @p: the &drm_printer + * + * Pretty printer for GuC log info + */ +void intel_guc_log_info(struct intel_guc_log *log, struct drm_printer *p) +{ + enum guc_log_buffer_type type; + + if (!intel_guc_log_relay_created(log)) { + drm_puts(p, "GuC log relay not created\n"); + return; + } + + drm_puts(p, "GuC logging stats:\n"); + + drm_printf(p, "\tRelay full count: %u\n", log->relay.full_count); + + for (type = GUC_DEBUG_LOG_BUFFER; type < GUC_MAX_LOG_BUFFER; type++) { + drm_printf(p, "\t%s:\tflush count %10u, overflow count %10u\n", + stringify_guc_log_type(type), + log->stats[type].flush, + log->stats[type].sampled_overflow); + } +} + +/** + * intel_guc_log_dump - dump the contents of the GuC log + * @log: the GuC log + * @p: the &drm_printer + * @dump_load_err: dump the log saved on GuC load error + * + * Pretty printer for the GuC log + */ +int intel_guc_log_dump(struct intel_guc_log *log, struct drm_printer *p, + bool dump_load_err) +{ + struct intel_guc *guc = log_to_guc(log); + struct intel_uc *uc = container_of(guc, struct intel_uc, guc); + struct drm_i915_gem_object *obj = NULL; + void *map; + u32 *page; + int i, j; + + if (!intel_guc_is_supported(guc)) + return -ENODEV; + + if (dump_load_err) + obj = uc->load_err_log; + else if (guc->log.vma) + obj = guc->log.vma->obj; + + if (!obj) + return 0; + + page = (u32 *)__get_free_page(GFP_KERNEL); + if (!page) + return -ENOMEM; + + intel_guc_dump_time_info(guc, p); + + map = i915_gem_object_pin_map_unlocked(obj, I915_MAP_WC); + if (IS_ERR(map)) { + guc_dbg(guc, "Failed to pin log object: %pe\n", map); + drm_puts(p, "(log data unaccessible)\n"); + free_page((unsigned long)page); + return PTR_ERR(map); + } + + for (i = 0; i < obj->base.size; i += PAGE_SIZE) { + if (!i915_memcpy_from_wc(page, map + i, PAGE_SIZE)) + memcpy(page, map + i, PAGE_SIZE); + + for (j = 0; j < PAGE_SIZE / sizeof(u32); j += 4) + drm_printf(p, "0x%08x 0x%08x 0x%08x 0x%08x\n", + *(page + j + 0), *(page + j + 1), + *(page + j + 2), *(page + j + 3)); + } + + drm_puts(p, "\n"); + + i915_gem_object_unpin_map(obj); + free_page((unsigned long)page); + + return 0; +} |