From 3a5a0393ab5de28f8dad100bf604e4ab55550836 Mon Sep 17 00:00:00 2001 From: Jesse Barnes Date: Tue, 15 Sep 2015 10:03:01 -0700 Subject: [PATCH] drm/i915: fix crash in error state readout on non-execlist platforms v2 Looks like this was introduced in: commit d1675198ed1f21aec6e036336e4340c40b726497 Author: Alex Dai 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 Reviewed-by: Dave Gordon Signed-off-by: Jesse Barnes Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/i915_gpu_error.c | 18 ++++++++++++------ 1 file changed, 12 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c index 3379f9c1ef88..f95de05f793d 100644 --- a/drivers/gpu/drm/i915/i915_gpu_error.c +++ b/drivers/gpu/drm/i915/i915_gpu_error.c @@ -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; } } -- 2.20.1