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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: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ben Widawsky 2014-06-30 09:53:42 -07:00 committed by Daniel Vetter
parent 0ca36d7839
commit e04934cf25
1 changed files with 71 additions and 0 deletions
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71
drivers/gpu/drm/i915/i915_debugfs.c
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@ -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)