On Fri, Jan 29, 2016 at 12:25:02PM +0000, Arun Siluvery wrote:
> On 29/01/2016 11:45, Chris Wilson wrote:
> >On Fri, Jan 29, 2016 at 09:49:07AM +0200, Mika Kuoppala wrote:
> >>Arun Siluvery <arun.siluvery@xxxxxxxxxxxxxxx> writes:
> >>
> >>>From: Dave Gordon <david.s.gordon@xxxxxxxxx>
> >>>
> >>>At present, execlist status/ctx_id and CSBs, not the submission queue
> >>>
> >>>For: VIZ-2021
> >>>Signed-off-by: Dave Gordon <david.s.gordon@xxxxxxxxx>
> >>>---
> >>> drivers/gpu/drm/i915/i915_drv.h | 9 +++++++++
> >>> drivers/gpu/drm/i915/i915_gpu_error.c | 38 +++++++++++++++++++++++++++++++++--
> >>> 2 files changed, 45 insertions(+), 2 deletions(-)
> >>>
> >>>diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> >>>index 01cc982..8b30242 100644
> >>>--- a/drivers/gpu/drm/i915/i915_drv.h
> >>>+++ b/drivers/gpu/drm/i915/i915_drv.h
> >>>@@ -552,6 +552,15 @@ struct drm_i915_error_state {
> >>> u32 rc_psmi; /* sleep state */
> >>> u32 semaphore_mboxes[I915_NUM_RINGS - 1];
> >>>
> >>>+ /* Execlists */
> >>>+ u32 execlist_status;
> >>>+ u32 execlist_ctx_id;
> >>>+ u32 execlist_csb_raw_pointer;
> >>>+ u32 execlist_csb_write_pointer;
> >>>+ u32 execlist_csb_read_pointer;
> >>>+ u32 execlist_csb[6];
> >>>+ u32 execlist_ctx[6];
> >>>+
> >>> struct drm_i915_error_object {
> >>> int page_count;
> >>> u64 gtt_offset;
> >>>diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
> >>>index 978c026..bf53c2b 100644
> >>>--- a/drivers/gpu/drm/i915/i915_gpu_error.c
> >>>+++ b/drivers/gpu/drm/i915/i915_gpu_error.c
> >>>@@ -247,6 +247,7 @@ static void i915_ring_error_state(struct drm_i915_error_state_buf *m,
> >>> int ring_idx)
> >>> {
> >>> struct drm_i915_error_ring *ring = &error->ring[ring_idx];
> >>>+ int i;
> >>>
> >>> if (!ring->valid)
> >>> return;
> >>>@@ -288,7 +289,6 @@ static void i915_ring_error_state(struct drm_i915_error_state_buf *m,
> >>> err_printf(m, " GFX_MODE: 0x%08x\n", ring->vm_info.gfx_mode);
> >>>
> >>> if (INTEL_INFO(dev)->gen >= 8) {
> >>>- int i;
> >>> for (i = 0; i < 4; i++)
> >>> err_printf(m, " PDP%d: 0x%016llx\n",
> >>> i, ring->vm_info.pdp[i]);
> >>>@@ -304,6 +304,17 @@ static void i915_ring_error_state(struct drm_i915_error_state_buf *m,
> >>> err_printf(m, " hangcheck: %s [%d]\n",
> >>> hangcheck_action_to_str(ring->hangcheck_action),
> >>> ring->hangcheck_score);
> >>>+
> >>>+ err_printf(m, " EXECLIST_STATUS: 0x%08x\n", ring->execlist_status);
> >>>+ err_printf(m, " EXECLIST_CTX_ID: 0x%08x\n", ring->execlist_ctx_id);
> >>>+ err_printf(m, " EXECLIST_CSBPTR: 0x%08x\n", ring->execlist_csb_raw_pointer);
> >>>+ err_printf(m, " EXECLIST_CSB_WR: 0x%08x\n", ring->execlist_csb_write_pointer);
> >>>+ err_printf(m, " EXECLIST_CSB_RD: 0x%08x\n", ring->execlist_csb_read_pointer);
> >>>+
> >>>+ for (i = 0; i < 6; i++) {
> >>>+ err_printf(m, " EXECLIST_CSB[%d]: 0x%08x\n", i, ring->execlist_csb[i]);
> >>>+ err_printf(m, " EXECLIST_CTX[%d]: 0x%08x\n", i, ring->execlist_ctx[i]);
> >>>+ }
> >>
> >>Please output only if i915.enable_execlists.
> >>
> >>> }
> >>>
> >>> void i915_error_printf(struct drm_i915_error_state_buf *e, const char *f, ...)
> >>>@@ -965,8 +976,27 @@ static void i915_record_ring_state(struct drm_device *dev,
> >>> I915_READ(GEN8_RING_PDP_LDW(ring, i));
> >>> }
> >>> }
> >>>-}
> >>>
> >>>+ if (i915.enable_execlists) {
> >>>+ int i;
> >>>+ u32 status_pointer = I915_READ(RING_CONTEXT_STATUS_PTR(ring));
> >>>+ u8 write_pointer = status_pointer & 0x07;
> >>>+ u8 read_pointer = ring->next_context_status_buffer;
> >>>+ if (read_pointer > write_pointer)
> >>>+ write_pointer += 6;
> >>>+
> >>>+ ering->execlist_status = I915_READ(RING_EXECLIST_STATUS_LO(ring));
> >>>+ ering->execlist_ctx_id = I915_READ(RING_EXECLIST_STATUS_HI(ring));
> >>>+ ering->execlist_csb_raw_pointer = status_pointer;
> >>>+ ering->execlist_csb_write_pointer = write_pointer;
> >>>+ ering->execlist_csb_read_pointer = read_pointer;
> >
> >Just the registers. How do you plan to use these to debug anything?
> csb pointers are helpful when there is an inconsistency between sw
> and hw which can happen if we miss ctx switch interrupts.
Yes, but you are printing them twice. (next_context_status_buffer can be
shot btw)
-Chris
--
Chris Wilson, Intel Open Source Technology Centre
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