[PATCH 37/43] drm/i915/bdw: Display execlists info in debugfs

Thomas Daniel
2014-07-24T16:05:34Z

From: Oscar Mateo <oscar.mateo@intel.com>

v2: Warn and return if LRCs are not enabled.

v3: Grab the Execlists spinlock (noticed by Daniel Vetter).

Signed-off-by: Oscar Mateo <oscar.mateo@intel.com>
---
drivers/gpu/drm/i915/i915_debugfs.c | 73 +++++++++++++++++++++++++++++++++++
drivers/gpu/drm/i915/intel_lrc.c | 6 ---
drivers/gpu/drm/i915/intel_lrc.h | 7 ++++
3 files changed, 80 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index fc39610..903ed67 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1674,6 +1674,78 @@ static int i915_context_status(struct seq_file *m, void *unused)
return 0;
}

+static int i915_execlists(struct seq_file *m, void *data)
+{
+ 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;
+ u32 status_pointer;
+ u8 read_pointer;
+ u8 write_pointer;
+ u32 status;
+ u32 ctx_id;
+ struct list_head *cursor;
+ int ring_id, i;
+
+ if (!i915.enable_execlists) {
+ seq_printf(m, "Logical Ring Contexts are disabled\n");
+ return 0;
+ }
+
+ for_each_ring(ring, dev_priv, ring_id) {
+ struct intel_ctx_submit_request *head_req = NULL;
+ int count = 0;
+ unsigned long flags;
+
+ seq_printf(m, "%s\n", ring->name);
+
+ status = I915_READ(RING_EXECLIST_STATUS(ring));
+ ctx_id = I915_READ(RING_EXECLIST_STATUS(ring) + 4);
+ seq_printf(m, "\tExeclist status: 0x%08X, context: %u\n",
+ status, ctx_id);
+
+ status_pointer = I915_READ(RING_CONTEXT_STATUS_PTR(ring));
+ seq_printf(m, "\tStatus pointer: 0x%08X\n", status_pointer);
+
+ read_pointer = ring->next_context_status_buffer;
+ write_pointer = status_pointer & 0x07;
+ if (read_pointer > write_pointer)
+ write_pointer += 6;
+ seq_printf(m, "\tRead pointer: 0x%08X, write pointer 0x%08X\n",
+ read_pointer, write_pointer);
+
+ for (i = 0; i < 6; i++) {
+ status = I915_READ(RING_CONTEXT_STATUS_BUF(ring) + 8*i);
+ ctx_id = I915_READ(RING_CONTEXT_STATUS_BUF(ring) + 8*i + 4);
+
+ seq_printf(m, "\tStatus buffer %d: 0x%08X, context: %u\n",
+ i, status, ctx_id);
+ }
+
+ spin_lock_irqsave(&ring->execlist_lock, flags);
+ list_for_each(cursor, &ring->execlist_queue)
+ count++;
+ head_req = list_first_entry_or_null(&ring->execlist_queue,
+ struct intel_ctx_submit_request, execlist_link);
+ spin_unlock_irqrestore(&ring->execlist_lock, flags);
+
+ seq_printf(m, "\t%d requests in queue\n", count);
+ if (head_req) {
+ struct drm_i915_gem_object *ctx_obj;
+
+ ctx_obj = head_req->ctx->engine[ring_id].state;
+ seq_printf(m, "\tHead request id: %u\n",
+ intel_execlists_ctx_id(ctx_obj));
+ seq_printf(m, "\tHead request tail: %u\n", head_req->tail);
+ }
+
+ seq_putc(m, '\n');
+ }
+
+ return 0;
+}
+
static int i915_gen6_forcewake_count_info(struct seq_file *m, void *data)
{
struct drm_info_node *node = m->private;
@@ -3899,6 +3971,7 @@ 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_execlists", i915_execlists, 0},
{"i915_gen6_forcewake_count", i915_gen6_forcewake_count_info, 0},
{"i915_swizzle_info", i915_swizzle_info, 0},
{"i915_ppgtt_info", i915_ppgtt_info, 0},
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 829b15d..8056fa4 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -46,12 +46,6 @@

#define GEN8_LR_CONTEXT_ALIGN 4096

-#define RING_ELSP(ring) ((ring)->mmio_base+0x230)
-#define RING_EXECLIST_STATUS(ring) ((ring)->mmio_base+0x234)
-#define RING_CONTEXT_CONTROL(ring) ((ring)->mmio_base+0x244)
-#define RING_CONTEXT_STATUS_BUF(ring) ((ring)->mmio_base+0x370)
-#define RING_CONTEXT_STATUS_PTR(ring) ((ring)->mmio_base+0x3a0)
-
#define RING_EXECLIST_QFULL (1 << 0x2)
#define RING_EXECLIST1_VALID (1 << 0x3)
#define RING_EXECLIST0_VALID (1 << 0x4)
diff --git a/drivers/gpu/drm/i915/intel_lrc.h b/drivers/gpu/drm/i915/intel_lrc.h
index 074b44f..f3b921b 100644
--- a/drivers/gpu/drm/i915/intel_lrc.h
+++ b/drivers/gpu/drm/i915/intel_lrc.h
@@ -24,6 +24,13 @@
#ifndef _INTEL_LRC_H_
#define _INTEL_LRC_H_

+/* Execlists regs */
+#define RING_ELSP(ring) ((ring)->mmio_base+0x230)
+#define RING_EXECLIST_STATUS(ring) ((ring)->mmio_base+0x234)
+#define RING_CONTEXT_CONTROL(ring) ((ring)->mmio_base+0x244)
+#define RING_CONTEXT_STATUS_BUF(ring) ((ring)->mmio_base+0x370)
+#define RING_CONTEXT_STATUS_PTR(ring) ((ring)->mmio_base+0x3a0)
+
/* Logical Rings */
void intel_logical_ring_stop(struct intel_engine_cs *ring);
void intel_logical_ring_cleanup(struct intel_engine_cs *ring);
--
1.7.9.5