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drm/i915: fix crash in error state readout on non-execlist platforms v2

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Looks like this was introduced in:
commit d1675198ed
Author: Alex Dai <yu.dai@intel.com>
Date:   Wed Aug 12 15:43:43 2015 +0100

    drm/i915: Integrate GuC-based command submission

This patch assumed LRC contexts and HWS layout, which is incorrect on
platforms without execlists.  This can lead to a crash in GPU error
state readout on those platforms.

I don't see a bug filed for this, but there may be one that I haven't
found.

v2: fixup offset handling for error capture fix (Dave)

Cc: Alex Dai <yu.dai@intel.com>
Reviewed-by: Dave Gordon <david.s.gordon@intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Jesse Barnes 2015-09-15 10:03:01 -07:00 committed by Daniel Vetter
parent 9eca6832f7
commit 3a5a0393ab
1 changed files with 12 additions and 6 deletions
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18
drivers/gpu/drm/i915/i915_gpu_error.c
View file

@ -457,17 +457,23 @@ int i915_error_state_to_str(struct drm_i915_error_state_buf *m,
}
if ((obj = error->ring[i].hws_page)) {
u64 hws_offset = obj->gtt_offset;
u32 *hws_page = &obj->pages[0][0];
if (i915.enable_execlists) {
hws_offset += LRC_PPHWSP_PN * PAGE_SIZE;
hws_page = &obj->pages[LRC_PPHWSP_PN][0];
}
err_printf(m, "%s --- HW Status = 0x%08llx\n",
dev_priv->ring[i].name,
obj->gtt_offset + LRC_PPHWSP_PN * PAGE_SIZE);
dev_priv->ring[i].name, hws_offset);
offset = 0;
for (elt = 0; elt < PAGE_SIZE/16; elt += 4) {
err_printf(m, "[%04x] %08x %08x %08x %08x\n",
offset,
obj->pages[LRC_PPHWSP_PN][elt],
obj->pages[LRC_PPHWSP_PN][elt+1],
obj->pages[LRC_PPHWSP_PN][elt+2],
obj->pages[LRC_PPHWSP_PN][elt+3]);
hws_page[elt],
hws_page[elt+1],
hws_page[elt+2],
hws_page[elt+3]);
offset += 16;
}
}