diff options
Diffstat (limited to 'drivers/gpu/drm/imagination/pvr_fw_trace.c')
-rw-r--r-- | drivers/gpu/drm/imagination/pvr_fw_trace.c | 471 |
1 files changed, 471 insertions, 0 deletions
diff --git a/drivers/gpu/drm/imagination/pvr_fw_trace.c b/drivers/gpu/drm/imagination/pvr_fw_trace.c new file mode 100644 index 0000000000..31199e45b7 --- /dev/null +++ b/drivers/gpu/drm/imagination/pvr_fw_trace.c @@ -0,0 +1,471 @@ +// SPDX-License-Identifier: GPL-2.0-only OR MIT +/* Copyright (c) 2023 Imagination Technologies Ltd. */ + +#include "pvr_device.h" +#include "pvr_gem.h" +#include "pvr_rogue_fwif.h" +#include "pvr_rogue_fwif_sf.h" +#include "pvr_fw_trace.h" + +#include <drm/drm_drv.h> +#include <drm/drm_file.h> + +#include <linux/build_bug.h> +#include <linux/dcache.h> +#include <linux/sysfs.h> +#include <linux/types.h> + +static void +tracebuf_ctrl_init(void *cpu_ptr, void *priv) +{ + struct rogue_fwif_tracebuf *tracebuf_ctrl = cpu_ptr; + struct pvr_fw_trace *fw_trace = priv; + u32 thread_nr; + + tracebuf_ctrl->tracebuf_size_in_dwords = ROGUE_FW_TRACE_BUF_DEFAULT_SIZE_IN_DWORDS; + tracebuf_ctrl->tracebuf_flags = 0; + + if (fw_trace->group_mask) + tracebuf_ctrl->log_type = fw_trace->group_mask | ROGUE_FWIF_LOG_TYPE_TRACE; + else + tracebuf_ctrl->log_type = ROGUE_FWIF_LOG_TYPE_NONE; + + for (thread_nr = 0; thread_nr < ARRAY_SIZE(fw_trace->buffers); thread_nr++) { + struct rogue_fwif_tracebuf_space *tracebuf_space = + &tracebuf_ctrl->tracebuf[thread_nr]; + struct pvr_fw_trace_buffer *trace_buffer = &fw_trace->buffers[thread_nr]; + + pvr_fw_object_get_fw_addr(trace_buffer->buf_obj, + &tracebuf_space->trace_buffer_fw_addr); + + tracebuf_space->trace_buffer = trace_buffer->buf; + tracebuf_space->trace_pointer = 0; + } +} + +int pvr_fw_trace_init(struct pvr_device *pvr_dev) +{ + struct pvr_fw_trace *fw_trace = &pvr_dev->fw_dev.fw_trace; + struct drm_device *drm_dev = from_pvr_device(pvr_dev); + u32 thread_nr; + int err; + + for (thread_nr = 0; thread_nr < ARRAY_SIZE(fw_trace->buffers); thread_nr++) { + struct pvr_fw_trace_buffer *trace_buffer = &fw_trace->buffers[thread_nr]; + + trace_buffer->buf = + pvr_fw_object_create_and_map(pvr_dev, + ROGUE_FW_TRACE_BUF_DEFAULT_SIZE_IN_DWORDS * + sizeof(*trace_buffer->buf), + PVR_BO_FW_FLAGS_DEVICE_UNCACHED | + PVR_BO_FW_NO_CLEAR_ON_RESET, + NULL, NULL, &trace_buffer->buf_obj); + if (IS_ERR(trace_buffer->buf)) { + drm_err(drm_dev, "Unable to allocate trace buffer\n"); + err = PTR_ERR(trace_buffer->buf); + trace_buffer->buf = NULL; + goto err_free_buf; + } + } + + /* TODO: Provide control of group mask. */ + fw_trace->group_mask = 0; + + fw_trace->tracebuf_ctrl = + pvr_fw_object_create_and_map(pvr_dev, + sizeof(*fw_trace->tracebuf_ctrl), + PVR_BO_FW_FLAGS_DEVICE_UNCACHED | + PVR_BO_FW_NO_CLEAR_ON_RESET, + tracebuf_ctrl_init, fw_trace, + &fw_trace->tracebuf_ctrl_obj); + if (IS_ERR(fw_trace->tracebuf_ctrl)) { + drm_err(drm_dev, "Unable to allocate trace buffer control structure\n"); + err = PTR_ERR(fw_trace->tracebuf_ctrl); + goto err_free_buf; + } + + BUILD_BUG_ON(ARRAY_SIZE(fw_trace->tracebuf_ctrl->tracebuf) != + ARRAY_SIZE(fw_trace->buffers)); + + for (thread_nr = 0; thread_nr < ARRAY_SIZE(fw_trace->buffers); thread_nr++) { + struct rogue_fwif_tracebuf_space *tracebuf_space = + &fw_trace->tracebuf_ctrl->tracebuf[thread_nr]; + struct pvr_fw_trace_buffer *trace_buffer = &fw_trace->buffers[thread_nr]; + + trace_buffer->tracebuf_space = tracebuf_space; + } + + return 0; + +err_free_buf: + for (thread_nr = 0; thread_nr < ARRAY_SIZE(fw_trace->buffers); thread_nr++) { + struct pvr_fw_trace_buffer *trace_buffer = &fw_trace->buffers[thread_nr]; + + if (trace_buffer->buf) + pvr_fw_object_unmap_and_destroy(trace_buffer->buf_obj); + } + + return err; +} + +void pvr_fw_trace_fini(struct pvr_device *pvr_dev) +{ + struct pvr_fw_trace *fw_trace = &pvr_dev->fw_dev.fw_trace; + u32 thread_nr; + + for (thread_nr = 0; thread_nr < ARRAY_SIZE(fw_trace->buffers); thread_nr++) { + struct pvr_fw_trace_buffer *trace_buffer = &fw_trace->buffers[thread_nr]; + + pvr_fw_object_unmap_and_destroy(trace_buffer->buf_obj); + } + pvr_fw_object_unmap_and_destroy(fw_trace->tracebuf_ctrl_obj); +} + +#if defined(CONFIG_DEBUG_FS) + +/** + * update_logtype() - Send KCCB command to trigger FW to update logtype + * @pvr_dev: Target PowerVR device + * @group_mask: New log group mask. + * + * Returns: + * * 0 on success, + * * Any error returned by pvr_kccb_send_cmd(), or + * * -%EIO if the device is lost. + */ +static int +update_logtype(struct pvr_device *pvr_dev, u32 group_mask) +{ + struct pvr_fw_trace *fw_trace = &pvr_dev->fw_dev.fw_trace; + struct rogue_fwif_kccb_cmd cmd; + int idx; + int err; + + if (group_mask) + fw_trace->tracebuf_ctrl->log_type = ROGUE_FWIF_LOG_TYPE_TRACE | group_mask; + else + fw_trace->tracebuf_ctrl->log_type = ROGUE_FWIF_LOG_TYPE_NONE; + + fw_trace->group_mask = group_mask; + + down_read(&pvr_dev->reset_sem); + if (!drm_dev_enter(from_pvr_device(pvr_dev), &idx)) { + err = -EIO; + goto err_up_read; + } + + cmd.cmd_type = ROGUE_FWIF_KCCB_CMD_LOGTYPE_UPDATE; + cmd.kccb_flags = 0; + + err = pvr_kccb_send_cmd(pvr_dev, &cmd, NULL); + + drm_dev_exit(idx); + +err_up_read: + up_read(&pvr_dev->reset_sem); + + return err; +} + +struct pvr_fw_trace_seq_data { + /** @buffer: Pointer to copy of trace data. */ + u32 *buffer; + + /** @start_offset: Starting offset in trace data, as reported by FW. */ + u32 start_offset; + + /** @idx: Current index into trace data. */ + u32 idx; + + /** @assert_buf: Trace assert buffer, as reported by FW. */ + struct rogue_fwif_file_info_buf assert_buf; +}; + +static u32 find_sfid(u32 id) +{ + u32 i; + + for (i = 0; i < ARRAY_SIZE(stid_fmts); i++) { + if (stid_fmts[i].id == id) + return i; + } + + return ROGUE_FW_SF_LAST; +} + +static u32 read_fw_trace(struct pvr_fw_trace_seq_data *trace_seq_data, u32 offset) +{ + u32 idx; + + idx = trace_seq_data->idx + offset; + if (idx >= ROGUE_FW_TRACE_BUF_DEFAULT_SIZE_IN_DWORDS) + return 0; + + idx = (idx + trace_seq_data->start_offset) % ROGUE_FW_TRACE_BUF_DEFAULT_SIZE_IN_DWORDS; + return trace_seq_data->buffer[idx]; +} + +/** + * fw_trace_get_next() - Advance trace index to next entry + * @trace_seq_data: Trace sequence data. + * + * Returns: + * * %true if trace index is now pointing to a valid entry, or + * * %false if trace index is pointing to an invalid entry, or has hit the end + * of the trace. + */ +static bool fw_trace_get_next(struct pvr_fw_trace_seq_data *trace_seq_data) +{ + u32 id, sf_id; + + while (trace_seq_data->idx < ROGUE_FW_TRACE_BUF_DEFAULT_SIZE_IN_DWORDS) { + id = read_fw_trace(trace_seq_data, 0); + trace_seq_data->idx++; + if (!ROGUE_FW_LOG_VALIDID(id)) + continue; + if (id == ROGUE_FW_SF_MAIN_ASSERT_FAILED) { + /* Assertion failure marks the end of the trace. */ + return false; + } + + sf_id = find_sfid(id); + if (sf_id == ROGUE_FW_SF_FIRST) + continue; + if (sf_id == ROGUE_FW_SF_LAST) { + /* + * Could not match with an ID in the SF table, trace is + * most likely corrupt from this point. + */ + return false; + } + + /* Skip over the timestamp, and any parameters. */ + trace_seq_data->idx += 2 + ROGUE_FW_SF_PARAMNUM(id); + + /* Ensure index is now pointing to a valid trace entry. */ + id = read_fw_trace(trace_seq_data, 0); + if (!ROGUE_FW_LOG_VALIDID(id)) + continue; + + return true; + } + + /* Hit end of trace data. */ + return false; +} + +/** + * fw_trace_get_first() - Find first valid entry in trace + * @trace_seq_data: Trace sequence data. + * + * Skips over invalid (usually zero) and ROGUE_FW_SF_FIRST entries. + * + * If the trace has no valid entries, this function will exit with the trace + * index pointing to the end of the trace. trace_seq_show() will return an error + * in this state. + */ +static void fw_trace_get_first(struct pvr_fw_trace_seq_data *trace_seq_data) +{ + trace_seq_data->idx = 0; + + while (trace_seq_data->idx < ROGUE_FW_TRACE_BUF_DEFAULT_SIZE_IN_DWORDS) { + u32 id = read_fw_trace(trace_seq_data, 0); + + if (ROGUE_FW_LOG_VALIDID(id)) { + u32 sf_id = find_sfid(id); + + if (sf_id != ROGUE_FW_SF_FIRST) + break; + } + trace_seq_data->idx++; + } +} + +static void *fw_trace_seq_start(struct seq_file *s, loff_t *pos) +{ + struct pvr_fw_trace_seq_data *trace_seq_data = s->private; + u32 i; + + /* Reset trace index, then advance to *pos. */ + fw_trace_get_first(trace_seq_data); + + for (i = 0; i < *pos; i++) { + if (!fw_trace_get_next(trace_seq_data)) + return NULL; + } + + return (trace_seq_data->idx < ROGUE_FW_TRACE_BUF_DEFAULT_SIZE_IN_DWORDS) ? pos : NULL; +} + +static void *fw_trace_seq_next(struct seq_file *s, void *v, loff_t *pos) +{ + struct pvr_fw_trace_seq_data *trace_seq_data = s->private; + + (*pos)++; + if (!fw_trace_get_next(trace_seq_data)) + return NULL; + + return (trace_seq_data->idx < ROGUE_FW_TRACE_BUF_DEFAULT_SIZE_IN_DWORDS) ? pos : NULL; +} + +static void fw_trace_seq_stop(struct seq_file *s, void *v) +{ +} + +static int fw_trace_seq_show(struct seq_file *s, void *v) +{ + struct pvr_fw_trace_seq_data *trace_seq_data = s->private; + u64 timestamp; + u32 id; + u32 sf_id; + + if (trace_seq_data->idx >= ROGUE_FW_TRACE_BUF_DEFAULT_SIZE_IN_DWORDS) + return -EINVAL; + + id = read_fw_trace(trace_seq_data, 0); + /* Index is not pointing at a valid entry. */ + if (!ROGUE_FW_LOG_VALIDID(id)) + return -EINVAL; + + sf_id = find_sfid(id); + /* Index is not pointing at a valid entry. */ + if (sf_id == ROGUE_FW_SF_LAST) + return -EINVAL; + + timestamp = read_fw_trace(trace_seq_data, 1) | + ((u64)read_fw_trace(trace_seq_data, 2) << 32); + timestamp = (timestamp & ~ROGUE_FWT_TIMESTAMP_TIME_CLRMSK) >> + ROGUE_FWT_TIMESTAMP_TIME_SHIFT; + + seq_printf(s, "[%llu] : ", timestamp); + if (id == ROGUE_FW_SF_MAIN_ASSERT_FAILED) { + seq_printf(s, "ASSERTION %s failed at %s:%u", + trace_seq_data->assert_buf.info, + trace_seq_data->assert_buf.path, + trace_seq_data->assert_buf.line_num); + } else { + seq_printf(s, stid_fmts[sf_id].name, + read_fw_trace(trace_seq_data, 3), + read_fw_trace(trace_seq_data, 4), + read_fw_trace(trace_seq_data, 5), + read_fw_trace(trace_seq_data, 6), + read_fw_trace(trace_seq_data, 7), + read_fw_trace(trace_seq_data, 8), + read_fw_trace(trace_seq_data, 9), + read_fw_trace(trace_seq_data, 10), + read_fw_trace(trace_seq_data, 11), + read_fw_trace(trace_seq_data, 12), + read_fw_trace(trace_seq_data, 13), + read_fw_trace(trace_seq_data, 14), + read_fw_trace(trace_seq_data, 15), + read_fw_trace(trace_seq_data, 16), + read_fw_trace(trace_seq_data, 17), + read_fw_trace(trace_seq_data, 18), + read_fw_trace(trace_seq_data, 19), + read_fw_trace(trace_seq_data, 20), + read_fw_trace(trace_seq_data, 21), + read_fw_trace(trace_seq_data, 22)); + } + seq_puts(s, "\n"); + return 0; +} + +static const struct seq_operations pvr_fw_trace_seq_ops = { + .start = fw_trace_seq_start, + .next = fw_trace_seq_next, + .stop = fw_trace_seq_stop, + .show = fw_trace_seq_show +}; + +static int fw_trace_open(struct inode *inode, struct file *file) +{ + struct pvr_fw_trace_buffer *trace_buffer = inode->i_private; + struct rogue_fwif_tracebuf_space *tracebuf_space = + trace_buffer->tracebuf_space; + struct pvr_fw_trace_seq_data *trace_seq_data; + int err; + + trace_seq_data = kzalloc(sizeof(*trace_seq_data), GFP_KERNEL); + if (!trace_seq_data) + return -ENOMEM; + + trace_seq_data->buffer = kcalloc(ROGUE_FW_TRACE_BUF_DEFAULT_SIZE_IN_DWORDS, + sizeof(*trace_seq_data->buffer), GFP_KERNEL); + if (!trace_seq_data->buffer) { + err = -ENOMEM; + goto err_free_data; + } + + /* + * Take a local copy of the trace buffer, as firmware may still be + * writing to it. This will exist as long as this file is open. + */ + memcpy(trace_seq_data->buffer, trace_buffer->buf, + ROGUE_FW_TRACE_BUF_DEFAULT_SIZE_IN_DWORDS * sizeof(u32)); + trace_seq_data->start_offset = READ_ONCE(tracebuf_space->trace_pointer); + trace_seq_data->assert_buf = tracebuf_space->assert_buf; + fw_trace_get_first(trace_seq_data); + + err = seq_open(file, &pvr_fw_trace_seq_ops); + if (err) + goto err_free_buffer; + + ((struct seq_file *)file->private_data)->private = trace_seq_data; + + return 0; + +err_free_buffer: + kfree(trace_seq_data->buffer); + +err_free_data: + kfree(trace_seq_data); + + return err; +} + +static int fw_trace_release(struct inode *inode, struct file *file) +{ + struct pvr_fw_trace_seq_data *trace_seq_data = + ((struct seq_file *)file->private_data)->private; + + seq_release(inode, file); + kfree(trace_seq_data->buffer); + kfree(trace_seq_data); + + return 0; +} + +static const struct file_operations pvr_fw_trace_fops = { + .owner = THIS_MODULE, + .open = fw_trace_open, + .read = seq_read, + .llseek = seq_lseek, + .release = fw_trace_release, +}; + +void +pvr_fw_trace_mask_update(struct pvr_device *pvr_dev, u32 old_mask, u32 new_mask) +{ + if (old_mask != new_mask) + update_logtype(pvr_dev, new_mask); +} + +void +pvr_fw_trace_debugfs_init(struct pvr_device *pvr_dev, struct dentry *dir) +{ + struct pvr_fw_trace *fw_trace = &pvr_dev->fw_dev.fw_trace; + u32 thread_nr; + + static_assert(ARRAY_SIZE(fw_trace->buffers) <= 10, + "The filename buffer is only large enough for a single-digit thread count"); + + for (thread_nr = 0; thread_nr < ARRAY_SIZE(fw_trace->buffers); ++thread_nr) { + char filename[8]; + + snprintf(filename, ARRAY_SIZE(filename), "trace_%u", thread_nr); + debugfs_create_file(filename, 0400, dir, + &fw_trace->buffers[thread_nr], + &pvr_fw_trace_fops); + } +} +#endif |