diff options
Diffstat (limited to 'drivers/gpu/drm/i915/intel_guc_log.c')
-rw-r--r-- | drivers/gpu/drm/i915/intel_guc_log.c | 299 |
1 files changed, 205 insertions, 94 deletions
diff --git a/drivers/gpu/drm/i915/intel_guc_log.c b/drivers/gpu/drm/i915/intel_guc_log.c index eaedd63e3819..c0c2e7d1c7d7 100644 --- a/drivers/gpu/drm/i915/intel_guc_log.c +++ b/drivers/gpu/drm/i915/intel_guc_log.c @@ -33,11 +33,10 @@ static void guc_log_capture_logs(struct intel_guc *guc); /** * DOC: GuC firmware log * - * Firmware log is enabled by setting i915.guc_log_level to non-negative level. + * 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_log_flush_complete(struct intel_guc *guc) @@ -59,11 +58,17 @@ static int guc_log_flush(struct intel_guc *guc) return intel_guc_send(guc, action, ARRAY_SIZE(action)); } -static int guc_log_control(struct intel_guc *guc, u32 control_val) +static int guc_log_control(struct intel_guc *guc, bool enable, u32 verbosity) { + union guc_log_control control_val = { + { + .logging_enabled = enable, + .verbosity = verbosity, + }, + }; u32 action[] = { INTEL_GUC_ACTION_UK_LOG_ENABLE_LOGGING, - control_val + control_val.value }; return intel_guc_send(guc, action, ARRAY_SIZE(action)); @@ -78,7 +83,8 @@ static int subbuf_start_callback(struct rchan_buf *buf, void *prev_subbuf, size_t prev_padding) { - /* Use no-overwrite mode by default, where relay will stop accepting + /* + * 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 @@ -104,7 +110,8 @@ static struct dentry *create_buf_file_callback(const char *filename, { struct dentry *buf_file; - /* This to enable the use of a single buffer for the relay channel and + /* + * 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. @@ -114,7 +121,8 @@ static struct dentry *create_buf_file_callback(const char *filename, if (!parent) return NULL; - /* Not using the channel filename passed as an argument, since for each + /* + * Not using the channel filename passed as an argument, since for each * channel relay appends the corresponding CPU number to the filename * passed in relay_open(). This should be fine as relay just needs a * dentry of the file associated with the channel buffer and that file's @@ -147,13 +155,16 @@ static int guc_log_relay_file_create(struct intel_guc *guc) struct dentry *log_dir; int ret; - if (i915_modparams.guc_log_level < 0) + if (!i915_modparams.guc_log_level) return 0; + mutex_lock(&guc->log.runtime.relay_lock); + /* For now create the log file in /sys/kernel/debug/dri/0 dir */ log_dir = dev_priv->drm.primary->debugfs_root; - /* If /sys/kernel/debug/dri/0 location do not exist, then debugfs is + /* + * If /sys/kernel/debug/dri/0 location do not exist, then debugfs is * not mounted and so can't create the relay file. * The relay API seems to fit well with debugfs only, for availing relay * there are 3 requirements which can be met for debugfs file only in a @@ -166,25 +177,41 @@ static int guc_log_relay_file_create(struct intel_guc *guc) */ if (!log_dir) { DRM_ERROR("Debugfs dir not available yet for GuC log file\n"); - return -ENODEV; + ret = -ENODEV; + goto out_unlock; } ret = relay_late_setup_files(guc->log.runtime.relay_chan, "guc_log", log_dir); if (ret < 0 && ret != -EEXIST) { DRM_ERROR("Couldn't associate relay chan with file %d\n", ret); - return ret; + goto out_unlock; } - return 0; + ret = 0; + +out_unlock: + mutex_unlock(&guc->log.runtime.relay_lock); + return ret; +} + +static bool guc_log_has_relay(struct intel_guc *guc) +{ + lockdep_assert_held(&guc->log.runtime.relay_lock); + + return guc->log.runtime.relay_chan != NULL; } static void guc_move_to_next_buf(struct intel_guc *guc) { - /* Make sure the updates made in the sub buffer are visible when + /* + * 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(); + if (!guc_log_has_relay(guc)) + return; + /* All data has been written, so now move the offset of sub buffer. */ relay_reserve(guc->log.runtime.relay_chan, guc->log.vma->obj->base.size); @@ -194,10 +221,11 @@ static void guc_move_to_next_buf(struct intel_guc *guc) static void *guc_get_write_buffer(struct intel_guc *guc) { - if (!guc->log.runtime.relay_chan) + if (!guc_log_has_relay(guc)) return NULL; - /* Just get the base address of a new sub buffer and copy data into it + /* + * 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 @@ -262,15 +290,30 @@ static void guc_read_update_log_buffer(struct intel_guc *guc) /* Get the pointer to shared GuC log buffer */ log_buf_state = src_data = guc->log.runtime.buf_addr; + mutex_lock(&guc->log.runtime.relay_lock); + /* Get the pointer to local buffer to store the logs */ log_buf_snapshot_state = dst_data = guc_get_write_buffer(guc); + 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. + */ + DRM_ERROR_RATELIMITED("no sub-buffer to capture logs\n"); + guc->log.capture_miss_count++; + mutex_unlock(&guc->log.runtime.relay_lock); + + return; + } + /* Actual logs are present from the 2nd page */ src_data += PAGE_SIZE; dst_data += PAGE_SIZE; for (type = GUC_ISR_LOG_BUFFER; type < GUC_MAX_LOG_BUFFER; type++) { - /* Make a copy of the state structure, inside GuC log buffer + /* + * 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. */ @@ -290,14 +333,12 @@ static void guc_read_update_log_buffer(struct intel_guc *guc) log_buf_state->flush_to_file = 0; log_buf_state++; - if (unlikely(!log_buf_snapshot_state)) - continue; - /* 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, + /* + * 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. @@ -332,15 +373,9 @@ static void guc_read_update_log_buffer(struct intel_guc *guc) dst_data += buffer_size; } - if (log_buf_snapshot_state) - guc_move_to_next_buf(guc); - else { - /* Used rate limited to avoid deluge of messages, logs might be - * getting consumed by User at a slow rate. - */ - DRM_ERROR_RATELIMITED("no sub-buffer to capture logs\n"); - guc->log.capture_miss_count++; - } + guc_move_to_next_buf(guc); + + mutex_unlock(&guc->log.runtime.relay_lock); } static void capture_logs_work(struct work_struct *work) @@ -360,19 +395,21 @@ static int guc_log_runtime_create(struct intel_guc *guc) { struct drm_i915_private *dev_priv = guc_to_i915(guc); void *vaddr; - struct rchan *guc_log_relay_chan; - size_t n_subbufs, subbuf_size; int ret; lockdep_assert_held(&dev_priv->drm.struct_mutex); + if (!guc->log.vma) + return -ENODEV; + GEM_BUG_ON(guc_log_has_runtime(guc)); ret = i915_gem_object_set_to_wc_domain(guc->log.vma->obj, true); if (ret) return ret; - /* Create a WC (Uncached for read) vmalloc mapping of log + /* + * Create a WC (Uncached for read) vmalloc mapping of log * buffer pages, so that we can directly get the data * (up-to-date) from memory. */ @@ -384,17 +421,55 @@ static int guc_log_runtime_create(struct intel_guc *guc) guc->log.runtime.buf_addr = vaddr; + return 0; +} + +static void guc_log_runtime_destroy(struct intel_guc *guc) +{ + /* + * It's possible that the runtime stuff was never allocated because + * GuC log was disabled at the boot time. + */ + if (!guc_log_has_runtime(guc)) + return; + + i915_gem_object_unpin_map(guc->log.vma->obj); + guc->log.runtime.buf_addr = NULL; +} + +void intel_guc_log_init_early(struct intel_guc *guc) +{ + mutex_init(&guc->log.runtime.relay_lock); + INIT_WORK(&guc->log.runtime.flush_work, capture_logs_work); +} + +int intel_guc_log_relay_create(struct intel_guc *guc) +{ + struct drm_i915_private *dev_priv = guc_to_i915(guc); + struct rchan *guc_log_relay_chan; + size_t n_subbufs, subbuf_size; + int ret; + + if (!i915_modparams.guc_log_level) + return 0; + + mutex_lock(&guc->log.runtime.relay_lock); + + GEM_BUG_ON(guc_log_has_relay(guc)); + /* Keep the size of sub buffers same as shared log buffer */ - subbuf_size = guc->log.vma->obj->base.size; + subbuf_size = GUC_LOG_SIZE; - /* Store up to 8 snapshots, which is large enough to buffer sufficient + /* + * 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; - /* Create a relay channel, so that we have buffers for storing + /* + * Create a relay channel, so that we have buffers for storing * the GuC firmware logs, the channel will be linked with a file * later on when debugfs is registered. */ @@ -404,33 +479,39 @@ static int guc_log_runtime_create(struct intel_guc *guc) DRM_ERROR("Couldn't create relay chan for GuC logging\n"); ret = -ENOMEM; - goto err_vaddr; + goto err; } GEM_BUG_ON(guc_log_relay_chan->subbuf_size < subbuf_size); guc->log.runtime.relay_chan = guc_log_relay_chan; - INIT_WORK(&guc->log.runtime.flush_work, capture_logs_work); + mutex_unlock(&guc->log.runtime.relay_lock); + return 0; -err_vaddr: - i915_gem_object_unpin_map(guc->log.vma->obj); - guc->log.runtime.buf_addr = NULL; +err: + mutex_unlock(&guc->log.runtime.relay_lock); + /* logging will be off */ + i915_modparams.guc_log_level = 0; return ret; } -static void guc_log_runtime_destroy(struct intel_guc *guc) +void intel_guc_log_relay_destroy(struct intel_guc *guc) { + mutex_lock(&guc->log.runtime.relay_lock); + /* - * It's possible that the runtime stuff was never allocated because - * guc_log_level was < 0 at the time - **/ - if (!guc_log_has_runtime(guc)) - return; + * It's possible that the relay was never allocated because + * GuC log was disabled at the boot time. + */ + if (!guc_log_has_relay(guc)) + goto out_unlock; relay_close(guc->log.runtime.relay_chan); - i915_gem_object_unpin_map(guc->log.vma->obj); - guc->log.runtime.buf_addr = NULL; + guc->log.runtime.relay_chan = NULL; + +out_unlock: + mutex_unlock(&guc->log.runtime.relay_lock); } static int guc_log_late_setup(struct intel_guc *guc) @@ -438,16 +519,24 @@ static int guc_log_late_setup(struct intel_guc *guc) struct drm_i915_private *dev_priv = guc_to_i915(guc); int ret; - lockdep_assert_held(&dev_priv->drm.struct_mutex); - if (!guc_log_has_runtime(guc)) { - /* If log_level was set as -1 at boot time, then setup needed to - * handle log buffer flush interrupts would not have been done yet, - * so do that now. + /* + * If log was disabled at boot time, then setup needed to handle + * log buffer flush interrupts would not have been done yet, so + * do that now. */ - ret = guc_log_runtime_create(guc); + ret = intel_guc_log_relay_create(guc); if (ret) goto err; + + mutex_lock(&dev_priv->drm.struct_mutex); + intel_runtime_pm_get(dev_priv); + ret = guc_log_runtime_create(guc); + intel_runtime_pm_put(dev_priv); + mutex_unlock(&dev_priv->drm.struct_mutex); + + if (ret) + goto err_relay; } ret = guc_log_relay_file_create(guc); @@ -457,10 +546,14 @@ static int guc_log_late_setup(struct intel_guc *guc) return 0; err_runtime: + mutex_lock(&dev_priv->drm.struct_mutex); guc_log_runtime_destroy(guc); + mutex_unlock(&dev_priv->drm.struct_mutex); +err_relay: + intel_guc_log_relay_destroy(guc); err: /* logging will remain off */ - i915_modparams.guc_log_level = -1; + i915_modparams.guc_log_level = 0; return ret; } @@ -470,7 +563,8 @@ static void guc_log_capture_logs(struct intel_guc *guc) guc_read_update_log_buffer(guc); - /* Generally device is expected to be active only at this + /* + * Generally device is expected to be active only at this * time, so get/put should be really quick. */ intel_runtime_pm_get(dev_priv); @@ -482,20 +576,26 @@ static void guc_flush_logs(struct intel_guc *guc) { struct drm_i915_private *dev_priv = guc_to_i915(guc); - if (!USES_GUC_SUBMISSION(dev_priv) || - (i915_modparams.guc_log_level < 0)) + if (!USES_GUC_SUBMISSION(dev_priv) || !i915_modparams.guc_log_level) return; /* First disable the interrupts, will be renabled afterwards */ + mutex_lock(&dev_priv->drm.struct_mutex); + intel_runtime_pm_get(dev_priv); gen9_disable_guc_interrupts(dev_priv); + intel_runtime_pm_put(dev_priv); + mutex_unlock(&dev_priv->drm.struct_mutex); - /* Before initiating the forceful flush, wait for any pending/ongoing + /* + * Before initiating the forceful flush, wait for any pending/ongoing * flush to complete otherwise forceful flush may not actually happen. */ flush_work(&guc->log.runtime.flush_work); /* Ask GuC to update the log buffer state */ + intel_runtime_pm_get(dev_priv); guc_log_flush(guc); + intel_runtime_pm_put(dev_priv); /* GuC would have updated log buffer by now, so capture it */ guc_log_capture_logs(guc); @@ -506,21 +606,12 @@ int intel_guc_log_create(struct intel_guc *guc) struct i915_vma *vma; unsigned long offset; u32 flags; - u32 size; int ret; GEM_BUG_ON(guc->log.vma); - if (i915_modparams.guc_log_level > GUC_LOG_VERBOSITY_MAX) - i915_modparams.guc_log_level = GUC_LOG_VERBOSITY_MAX; - - /* The first page is to save log buffer state. Allocate one - * extra page for others in case for overlap */ - size = (1 + GUC_LOG_DPC_PAGES + 1 + - GUC_LOG_ISR_PAGES + 1 + - GUC_LOG_CRASH_PAGES + 1) << PAGE_SHIFT; - - /* We require SSE 4.1 for fast reads from the GuC log buffer and + /* + * We require SSE 4.1 for fast reads from the GuC log buffer and * it should be present on the chipsets supporting GuC based * submisssions. */ @@ -529,7 +620,7 @@ int intel_guc_log_create(struct intel_guc *guc) goto err; } - vma = intel_guc_allocate_vma(guc, size); + vma = intel_guc_allocate_vma(guc, GUC_LOG_SIZE); if (IS_ERR(vma)) { ret = PTR_ERR(vma); goto err; @@ -537,7 +628,7 @@ int intel_guc_log_create(struct intel_guc *guc) guc->log.vma = vma; - if (i915_modparams.guc_log_level >= 0) { + if (i915_modparams.guc_log_level) { ret = guc_log_runtime_create(guc); if (ret < 0) goto err_vma; @@ -558,7 +649,7 @@ err_vma: i915_vma_unpin_and_release(&guc->log.vma); err: /* logging will be off */ - i915_modparams.guc_log_level = -1; + i915_modparams.guc_log_level = 0; return ret; } @@ -568,35 +659,46 @@ void intel_guc_log_destroy(struct intel_guc *guc) i915_vma_unpin_and_release(&guc->log.vma); } -int i915_guc_log_control(struct drm_i915_private *dev_priv, u64 control_val) +int intel_guc_log_control(struct intel_guc *guc, u64 control_val) { - struct intel_guc *guc = &dev_priv->guc; - - union guc_log_control log_param; + struct drm_i915_private *dev_priv = guc_to_i915(guc); + bool enable_logging = control_val > 0; + u32 verbosity; int ret; - log_param.value = control_val; + if (!guc->log.vma) + return -ENODEV; - if (log_param.verbosity < GUC_LOG_VERBOSITY_MIN || - log_param.verbosity > GUC_LOG_VERBOSITY_MAX) + BUILD_BUG_ON(GUC_LOG_VERBOSITY_MIN); + if (control_val > 1 + GUC_LOG_VERBOSITY_MAX) return -EINVAL; /* This combination doesn't make sense & won't have any effect */ - if (!log_param.logging_enabled && (i915_modparams.guc_log_level < 0)) + if (!enable_logging && !i915_modparams.guc_log_level) return 0; - ret = guc_log_control(guc, log_param.value); + verbosity = enable_logging ? control_val - 1 : 0; + + ret = mutex_lock_interruptible(&dev_priv->drm.struct_mutex); + if (ret) + return ret; + intel_runtime_pm_get(dev_priv); + ret = guc_log_control(guc, enable_logging, verbosity); + intel_runtime_pm_put(dev_priv); + mutex_unlock(&dev_priv->drm.struct_mutex); + if (ret < 0) { DRM_DEBUG_DRIVER("guc_logging_control action failed %d\n", ret); return ret; } - if (log_param.logging_enabled) { - i915_modparams.guc_log_level = log_param.verbosity; + if (enable_logging) { + i915_modparams.guc_log_level = 1 + verbosity; - /* If log_level was set as -1 at boot time, then the relay channel file - * wouldn't have been created by now and interrupts also would not have - * been enabled. Try again now, just in case. + /* + * If log was disabled at boot time, then the relay channel file + * wouldn't have been created by now and interrupts also would + * not have been enabled. Try again now, just in case. */ ret = guc_log_late_setup(guc); if (ret < 0) { @@ -605,9 +707,14 @@ int i915_guc_log_control(struct drm_i915_private *dev_priv, u64 control_val) } /* GuC logging is currently the only user of Guc2Host interrupts */ + mutex_lock(&dev_priv->drm.struct_mutex); + intel_runtime_pm_get(dev_priv); gen9_enable_guc_interrupts(dev_priv); + intel_runtime_pm_put(dev_priv); + mutex_unlock(&dev_priv->drm.struct_mutex); } else { - /* Once logging is disabled, GuC won't generate logs & send an + /* + * Once logging is disabled, GuC won't generate logs & send an * interrupt. But there could be some data in the log buffer * which is yet to be captured. So request GuC to update the log * buffer state and then collect the left over logs. @@ -615,7 +722,7 @@ int i915_guc_log_control(struct drm_i915_private *dev_priv, u64 control_val) guc_flush_logs(guc); /* As logging is disabled, update log level to reflect that */ - i915_modparams.guc_log_level = -1; + i915_modparams.guc_log_level = 0; } return ret; @@ -623,23 +730,27 @@ int i915_guc_log_control(struct drm_i915_private *dev_priv, u64 control_val) void i915_guc_log_register(struct drm_i915_private *dev_priv) { - if (!USES_GUC_SUBMISSION(dev_priv) || - (i915_modparams.guc_log_level < 0)) + if (!USES_GUC_SUBMISSION(dev_priv) || !i915_modparams.guc_log_level) return; - mutex_lock(&dev_priv->drm.struct_mutex); guc_log_late_setup(&dev_priv->guc); - mutex_unlock(&dev_priv->drm.struct_mutex); } void i915_guc_log_unregister(struct drm_i915_private *dev_priv) { + struct intel_guc *guc = &dev_priv->guc; + if (!USES_GUC_SUBMISSION(dev_priv)) return; mutex_lock(&dev_priv->drm.struct_mutex); /* GuC logging is currently the only user of Guc2Host interrupts */ + intel_runtime_pm_get(dev_priv); gen9_disable_guc_interrupts(dev_priv); - guc_log_runtime_destroy(&dev_priv->guc); + intel_runtime_pm_put(dev_priv); + + guc_log_runtime_destroy(guc); mutex_unlock(&dev_priv->drm.struct_mutex); + + intel_guc_log_relay_destroy(guc); } |