On Fri, Jun 13, 2014 at 04:38:04PM +0100, oscar.mateo@xxxxxxxxx wrote:
> From: Oscar Mateo <oscar.mateo@xxxxxxxxx>
>
> v2: Warn and return if LRCs are not enabled.
>
> Signed-off-by: Oscar Mateo <oscar.mateo@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_debugfs.c | 72 +++++++++++++++++++++++++++++++++++++
> drivers/gpu/drm/i915/intel_lrc.c | 6 ----
> drivers/gpu/drm/i915/intel_lrc.h | 7 ++++
> 3 files changed, 79 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> index b09cab4..3ccdf0d 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -1753,6 +1753,77 @@ 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;
> + struct intel_ctx_submit_request *head_req;
> + int ring_id, i;
> +
> + if (!intel_enable_execlists(dev)) {
> + seq_printf(m, "Logical Ring Contexts are disabled\n");
> + return 0;
> + }
> +
> + for_each_ring(ring, dev_priv, ring_id) {
> + int count = 0;
> +
> + 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);
> + }
> +
> + list_for_each(cursor, &ring->execlist_queue) {
> + count++;
> + }
> + seq_printf(m, "\t%d requests in queue\n", count);
> +
> + if (count > 0) {
> + struct drm_i915_gem_object *ctx_obj;
> +
> + head_req = list_first_entry(&ring->execlist_queue,
> + struct intel_ctx_submit_request, execlist_link);
> +
> + ctx_obj = head_req->ctx->engine[ring_id].obj;
> + 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;
> +}
debugfs files with 0 locking tend to eventually blow up. Please don't even
though there's way too much precedence. I know that means you first have
to debug the deadlock if you hit such a beast, but usually lockdep and the
other in-kernel tooling are adequate for that.
-Daniel
> +
> static int i915_gen6_forcewake_count_info(struct seq_file *m, void *data)
> {
> struct drm_info_node *node = m->private;
> @@ -3813,6 +3884,7 @@ 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 ea4b358..c23c0f6 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 ee877aa..c318dcb 100644
> --- a/drivers/gpu/drm/i915/intel_lrc.h
> +++ b/drivers/gpu/drm/i915/intel_lrc.h
> @@ -1,6 +1,13 @@
> #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_cleanup(struct intel_engine_cs *ring);
> int intel_logical_rings_init(struct drm_device *dev);
> --
> 1.9.0
>
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--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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