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Commit e04934cf authored by Ben Widawsky's avatar Ben Widawsky Committed by Daniel Vetter
Browse files

drm/i915: semaphore debugfs 



Simple debugfs file to display the current state of semaphores. This is
useful if you want to see the state without hanging the GPU.

NOTE: This patch is optional to the series.

NOTE2: Like the GPU error state collection, the reads are currently
incoherent.

v2 (Rodrigo): * Iterate only on active rings.
   	      * s/ring_buffer/engine_cs.

Reviewed-by: default avatarRodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: default avatarBen Widawsky <ben@bwidawsk.net>
Signed-off-by: default avatarRodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
parent 0ca36d78

drivers/gpu/drm/i915/i915_debugfs.c

+71 −0
Original line number Diff line number Diff line
@@ -2395,6 +2395,76 @@ static int i915_display_info(struct seq_file *m, void *unused) 
	return 0;

}



static int i915_semaphore_status(struct seq_file *m, void *unused)

{

	struct drm_info_node *node = (struct drm_info_node *) m->private;

	struct drm_device *dev = node->minor->dev;

	struct drm_i915_private *dev_priv = dev->dev_private;

	struct intel_engine_cs *ring;

	int num_rings = hweight32(INTEL_INFO(dev)->ring_mask);

	int i, j, ret;



	if (!i915_semaphore_is_enabled(dev)) {

		seq_puts(m, "Semaphores are disabled\n");

		return 0;

	}



	ret = mutex_lock_interruptible(&dev->struct_mutex);

	if (ret)

		return ret;



	if (IS_BROADWELL(dev)) {

		struct page *page;

		uint64_t *seqno;



		page = i915_gem_object_get_page(dev_priv->semaphore_obj, 0);



		seqno = (uint64_t *)kmap_atomic(page);

		for_each_ring(ring, dev_priv, i) {

			uint64_t offset;



			seq_printf(m, "%s\n", ring->name);



			seq_puts(m, "  Last signal:");

			for (j = 0; j < num_rings; j++) {

				offset = i * I915_NUM_RINGS + j;

				seq_printf(m, "0x%08llx (0x%02llx) ",

					   seqno[offset], offset * 8);

			}

			seq_putc(m, '\n');



			seq_puts(m, "  Last wait:  ");

			for (j = 0; j < num_rings; j++) {

				offset = i + (j * I915_NUM_RINGS);

				seq_printf(m, "0x%08llx (0x%02llx) ",

					   seqno[offset], offset * 8);

			}

			seq_putc(m, '\n');



		}

		kunmap_atomic(seqno);

	} else {

		seq_puts(m, "  Last signal:");

		for_each_ring(ring, dev_priv, i)

			for (j = 0; j < num_rings; j++)

				seq_printf(m, "0x%08x\n",

					   I915_READ(ring->semaphore.mbox.signal[j]));

		seq_putc(m, '\n');

	}



	seq_puts(m, "\nSync seqno:\n");

	for_each_ring(ring, dev_priv, i) {

		for (j = 0; j < num_rings; j++) {

			seq_printf(m, "  0x%08x ", ring->semaphore.sync_seqno[j]);

		}

		seq_putc(m, '\n');

	}

	seq_putc(m, '\n');



	mutex_unlock(&dev->struct_mutex);

	return 0;

}



struct pipe_crc_info {

	const char *name;

	struct drm_device *dev;
@@ -3904,6 +3974,7 @@ static const struct drm_info_list i915_debugfs_list[] = { 
	{"i915_pc8_status", i915_pc8_status, 0},

	{"i915_power_domain_info", i915_power_domain_info, 0},

	{"i915_display_info", i915_display_info, 0},

	{"i915_semaphore_status", i915_semaphore_status, 0},

};

#define I915_DEBUGFS_ENTRIES ARRAY_SIZE(i915_debugfs_list)