drm/i915/bdw: Print context state in debugfs

This has turned out to be really handy in debug so far.

Update:
Since writing this patch, I've gotten similar code upstream for error
state. I've used it quite a bit in debugfs however, and I'd like to keep
it here at least until preemption is working.

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>

This patch was accidentally dropped in the first Execlists version, and
it has been very useful indeed. Put it back again, but as a standalone
debugfs file.

Signed-off-by: Oscar Mateo <oscar.mateo@intel.com>

v2: Take the device struct_mutex rather than mode_config mutex for
atomic state capture.

Signed-off-by: Thomas Daniel <thomas.daniel@intel.com>
Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 52 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 4f279cfe67b8..6c82bdaa0822 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1750,6 +1750,57 @@ static int i915_context_status(struct seq_file *m, void *unused)
         return 0;
 }
 
+static int i915_dump_lrc(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;
+        struct intel_context *ctx;
+        int ret, i;
+
+        if (!i915.enable_execlists) {
+                seq_printf(m, "Logical Ring Contexts are disabled\n");
+                return 0;
+        }
+
+        ret = mutex_lock_interruptible(&dev->struct_mutex);
+        if (ret)
+                return ret;
+
+        list_for_each_entry(ctx, &dev_priv->context_list, link) {
+                for_each_ring(ring, dev_priv, i) {
+                        struct drm_i915_gem_object *ctx_obj = ctx->engine[i].state;
+
+                        if (ring->default_context == ctx)
+                                continue;
+
+                        if (ctx_obj) {
+                                struct page *page = i915_gem_object_get_page(ctx_obj, 1);
+                                uint32_t *reg_state = kmap_atomic(page);
+                                int j;
+
+                                seq_printf(m, "CONTEXT: %s %u\n", ring->name,
+                                                intel_execlists_ctx_id(ctx_obj));
+
+                                for (j = 0; j < 0x600 / sizeof(u32) / 4; j += 4) {
+                                        seq_printf(m, "\t[0x%08lx] 0x%08x 0x%08x 0x%08x 0x%08x\n",
+                                        i915_gem_obj_ggtt_offset(ctx_obj) + 4096 + (j * 4),
+                                        reg_state[j], reg_state[j + 1],
+                                        reg_state[j + 2], reg_state[j + 3]);
+                                }
+                                kunmap_atomic(reg_state);
+
+                                seq_putc(m, '\n');
+                        }
+                }
+        }
+
+        mutex_unlock(&dev->struct_mutex);
+
+        return 0;
+}
+
 static int i915_execlists(struct seq_file *m, void *data)
 {
         struct drm_info_node *node = (struct drm_info_node *)m->private;
@@ -4083,6 +4134,7 @@ static const struct drm_info_list i915_debugfs_list[] = {
         {"i915_opregion", i915_opregion, 0},
         {"i915_gem_framebuffer", i915_gem_framebuffer_info, 0},
         {"i915_context_status", i915_context_status, 0},
+        {"i915_dump_lrc", i915_dump_lrc, 0},
         {"i915_execlists", i915_execlists, 0},
         {"i915_gen6_forcewake_count", i915_gen6_forcewake_count_info, 0},
         {"i915_swizzle_info", i915_swizzle_info, 0},