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drm/i915: Invalidate TLBs for the rings after a reset 

After any "soft gfx reset" we must manually invalidate the TLBs
associated with each ring. Empirically, it seems that a
suspend/resume or D3-D0 cycle count as a "soft reset". The symptom is
that the hardware would fail to note the new address for its status
page, and so it would continue to write the shadow registers and
breadcrumbs into the old physical address (now used by something
completely different, scary). Whereas the driver would read the new
status page and never see any progress, it would appear that the GPU
hung immediately upon resume.

Based on a patch by naresh kumar kachhi <naresh.kumar.kacchi@intel.com>

Reported-by: Thiago Macieira <thiago@kde.org>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=64725
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Tested-by: Thiago Macieira <thiago@kde.org>
Cc: stable@vger.kernel.org
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Chris Wilson 2013-08-06 19:01:14 +01:00 committed by Daniel Vetter
parent 63b66e5ba5
commit 884020bf3d
2 changed files with 14 additions and 0 deletions
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2
drivers/gpu/drm/i915/i915_reg.h
View File

@ -752,6 +752,8 @@
will not assert AGPBUSY# and will only
be delivered when out of C3. */
#define INSTPM_FORCE_ORDERING (1<<7) /* GEN6+ */
#define INSTPM_TLB_INVALIDATE (1<<9)
#define INSTPM_SYNC_FLUSH (1<<5)
#define ACTHD 0x020c8
#define FW_BLC 0x020d8
#define FW_BLC2 0x020dc

12
drivers/gpu/drm/i915/intel_ringbuffer.c
View File

@ -968,6 +968,18 @@ void intel_ring_setup_status_page(struct intel_ring_buffer *ring)
I915_WRITE(mmio, (u32)ring->status_page.gfx_addr);
POSTING_READ(mmio);
/* Flush the TLB for this page */
if (INTEL_INFO(dev)->gen >= 6) {
u32 reg = RING_INSTPM(ring->mmio_base);
I915_WRITE(reg,
_MASKED_BIT_ENABLE(INSTPM_TLB_INVALIDATE |
INSTPM_SYNC_FLUSH));
if (wait_for((I915_READ(reg) & INSTPM_SYNC_FLUSH) == 0,
1000))
DRM_ERROR("%s: wait for SyncFlush to complete for TLB invalidation timed out\n",
ring->name);
}
}
static int