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.kac...@intel.com> Reported-by: Thiago Macieira <thi...@kde.org> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=64725 Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk> --- drivers/gpu/drm/i915/i915_reg.h | 2 ++ drivers/gpu/drm/i915/intel_ringbuffer.c | 12 ++++++++++++ 2 files changed, 14 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 714a909..ca82e5f 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -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 diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c index dbc1f7c..58eb6a0 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.c +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c @@ -972,6 +972,18 @@ 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 -- 1.8.4.rc1 _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx
