@@ -170,6 +170,15 @@ static int host2guc_sample_forcewake(struct intel_guc *guc,
return host2guc_action(guc, data, ARRAY_SIZE(data));
}
+static int host2guc_logbuffer_flush_complete(struct intel_guc *guc)
+{
+ u32 data[1];
+
+ data[0] = HOST2GUC_ACTION_LOG_BUFFER_FILE_FLUSH_COMPLETE;
+
+ return host2guc_action(guc, data, 1);
+}
+
/*
* Initialise, update, or clear doorbell data shared with the GuC
*
@@ -847,6 +856,163 @@ err:
return NULL;
}
+static void guc_move_to_next_buf(struct intel_guc *guc)
+{
+}
+
+static void *guc_get_write_buffer(struct intel_guc *guc)
+{
+ return NULL;
+}
+
+static unsigned int guc_get_log_buffer_size(enum guc_log_buffer_type type)
+{
+ switch (type) {
+ case GUC_ISR_LOG_BUFFER:
+ return (GUC_LOG_ISR_PAGES + 1) * PAGE_SIZE;
+ case GUC_DPC_LOG_BUFFER:
+ return (GUC_LOG_DPC_PAGES + 1) * PAGE_SIZE;
+ case GUC_CRASH_DUMP_LOG_BUFFER:
+ return (GUC_LOG_CRASH_PAGES + 1) * PAGE_SIZE;
+ default:
+ MISSING_CASE(type);
+ }
+
+ return 0;
+}
+
+static void guc_read_update_log_buffer(struct intel_guc *guc)
+{
+ struct guc_log_buffer_state *log_buf_state, *log_buf_snapshot_state;
+ struct guc_log_buffer_state log_buf_state_local;
+ unsigned int buffer_size, write_offset;
+ enum guc_log_buffer_type type;
+ void *src_data, *dst_data;
+
+ if (WARN_ON(!guc->log.buf_addr))
+ return;
+
+ /* Get the pointer to shared GuC log buffer */
+ log_buf_state = src_data = guc->log.buf_addr;
+
+ /* Get the pointer to local buffer to store the logs */
+ log_buf_snapshot_state = dst_data = guc_get_write_buffer(guc);
+
+ /* 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
+ * (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 = guc_get_log_buffer_size(type);
+ write_offset = log_buf_state_local.sampled_write_ptr;
+
+ /* Update the state of shared log buffer */
+ log_buf_state->read_ptr = write_offset;
+ 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,
+ * 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. */
+ memcpy(dst_data, src_data, buffer_size);
+
+ src_data += buffer_size;
+ dst_data += buffer_size;
+
+ /* FIXME: invalidate/flush for log buffer needed */
+ }
+
+ if (log_buf_snapshot_state)
+ guc_move_to_next_buf(guc);
+}
+
+static void guc_capture_logs_work(struct work_struct *work)
+{
+ struct drm_i915_private *dev_priv =
+ container_of(work, struct drm_i915_private, guc.log.flush_work);
+
+ i915_guc_capture_logs(dev_priv);
+}
+
+static void guc_log_cleanup(struct intel_guc *guc)
+{
+ struct drm_i915_private *dev_priv = guc_to_i915(guc);
+
+ lockdep_assert_held(&dev_priv->drm.struct_mutex);
+
+ /* First disable the flush interrupt */
+ gen9_disable_guc_interrupts(dev_priv);
+
+ if (guc->log.flush_wq)
+ destroy_workqueue(guc->log.flush_wq);
+
+ guc->log.flush_wq = NULL;
+
+ if (guc->log.buf_addr)
+ i915_gem_object_unpin_map(guc->log.vma->obj);
+
+ guc->log.buf_addr = NULL;
+}
+
+static int guc_log_create_extras(struct intel_guc *guc)
+{
+ struct drm_i915_private *dev_priv = guc_to_i915(guc);
+ void *vaddr;
+ int ret;
+
+ lockdep_assert_held(&dev_priv->drm.struct_mutex);
+
+ /* Nothing to do */
+ if (i915.guc_log_level < 0)
+ return 0;
+
+ if (!guc->log.buf_addr) {
+ /* Create a vmalloc mapping of log buffer pages */
+ vaddr = i915_gem_object_pin_map(guc->log.vma->obj, I915_MAP_WB);
+ if (IS_ERR(vaddr)) {
+ ret = PTR_ERR(vaddr);
+ DRM_ERROR("Couldn't map log buffer pages %d\n", ret);
+ return ret;
+ }
+
+ guc->log.buf_addr = vaddr;
+ }
+
+ if (!guc->log.flush_wq) {
+ INIT_WORK(&guc->log.flush_work, guc_capture_logs_work);
+
+ /* Need a dedicated wq to process log buffer flush interrupts
+ * from GuC without much delay so as to avoid any loss of logs.
+ */
+ guc->log.flush_wq = alloc_ordered_workqueue("i915-guc_log", WQ_HIGHPRI);
+ if (guc->log.flush_wq == NULL) {
+ DRM_ERROR("Couldn't allocate the wq for GuC logging\n");
+ return -ENOMEM;
+ }
+ }
+
+ return 0;
+}
+
static void guc_log_create(struct intel_guc *guc)
{
struct i915_vma *vma;
@@ -872,6 +1038,13 @@ static void guc_log_create(struct intel_guc *guc)
}
guc->log.vma = vma;
+
+ if (guc_log_create_extras(guc)) {
+ guc_log_cleanup(guc);
+ i915_vma_unpin_and_release(&guc->log.vma);
+ i915.guc_log_level = -1;
+ return;
+ }
}
/* each allocated unit is a page */
@@ -1063,6 +1236,7 @@ void i915_guc_submission_fini(struct drm_i915_private *dev_priv)
struct intel_guc *guc = &dev_priv->guc;
i915_vma_unpin_and_release(&guc->ads_vma);
+ guc_log_cleanup(guc);
i915_vma_unpin_and_release(&guc->log.vma);
if (guc->ctx_pool_vma)
@@ -1124,3 +1298,15 @@ int intel_guc_resume(struct drm_device *dev)
return host2guc_action(guc, data, ARRAY_SIZE(data));
}
+
+void i915_guc_capture_logs(struct drm_i915_private *dev_priv)
+{
+ guc_read_update_log_buffer(&dev_priv->guc);
+
+ /* Generally device is expected to be active only at this
+ * time, so get/put should be really quick.
+ */
+ intel_runtime_pm_get(dev_priv);
+ host2guc_logbuffer_flush_complete(&dev_priv->guc);
+ intel_runtime_pm_put(dev_priv);
+}
@@ -1668,7 +1668,33 @@ static void gen6_rps_irq_handler(struct drm_i915_private *dev_priv, u32 pm_iir)
static void gen9_guc_irq_handler(struct drm_i915_private *dev_priv, u32 gt_iir)
{
if (gt_iir & GEN9_GUC_TO_HOST_INT_EVENT) {
- /* TODO: Handle events for which GuC interrupted host */
+ /* Sample the log buffer flush related bits & clear them out now
+ * itself from the message identity register to minimize the
+ * probability of losing a flush interrupt, when there are back
+ * to back flush interrupts.
+ * There can be a new flush interrupt, for different log buffer
+ * type (like for ISR), whilst Host is handling one (for DPC).
+ * Since same bit is used in message register for ISR & DPC, it
+ * could happen that GuC sets the bit for 2nd interrupt but Host
+ * clears out the bit on handling the 1st interrupt.
+ */
+ u32 msg, flush;
+
+ msg = I915_READ(SOFT_SCRATCH(15));
+ flush = msg & (GUC2HOST_MSG_CRASH_DUMP_POSTED |
+ GUC2HOST_MSG_FLUSH_LOG_BUFFER);
+ if (flush) {
+ /* Clear the message bits that are handled */
+ I915_WRITE(SOFT_SCRATCH(15), msg & ~flush);
+
+ /* Handle flush interrupt in bottom half */
+ queue_work(dev_priv->guc.log.flush_wq,
+ &dev_priv->guc.log.flush_work);
+ } else {
+ /* Not clearing of unhandled event bits won't result in
+ * re-triggering of the interrupt.
+ */
+ }
}
}
@@ -126,6 +126,9 @@ struct intel_guc_fw {
struct intel_guc_log {
uint32_t flags;
struct i915_vma *vma;
+ void *buf_addr;
+ struct workqueue_struct *flush_wq;
+ struct work_struct flush_work;
};
struct intel_guc {
@@ -170,5 +173,6 @@ int i915_guc_wq_reserve(struct drm_i915_gem_request *rq);
void i915_guc_wq_unreserve(struct drm_i915_gem_request *request);
void i915_guc_submission_disable(struct drm_i915_private *dev_priv);
void i915_guc_submission_fini(struct drm_i915_private *dev_priv);
+void i915_guc_capture_logs(struct drm_i915_private *dev_priv);
#endif