Following a reset, the context and page directory registers are lost.
However, the queue of requests that we resubmit after the reset may
depend upon them - the registers are restored from a context image, but
that restore may be inhibited and may simply be absent from the request
if it was in the middle of a sequence using the same context. If we
prime the CCID/PD registers with the first request in the queue (even
for the hung request), we prevent invalid memory access for the
following requests (and continually hung engines).
v2: Magic BIT(8), reserved for future use but still appears unused.
v3: Some commentary on handling innocent vs guilty requests
v4: Add a wait for PD_BASE fetch. The reload appears to be instant on my
Ivybridge, but this bit probably exists for a reason.
Fixes: 821ed7df6e2a ("drm/i915: Update reset path to fix incomplete requests")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170207152437.4252-1-chris@chris-wilson.co.uk
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
(cherry picked from commit
c0dcb203fb009678e5be9e7782329dcfbbf16439)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
engine->irq_seqno_barrier(engine);
request = i915_gem_find_active_request(engine);
- if (!request)
- return;
-
- if (!i915_gem_reset_request(request))
- return;
+ if (request && i915_gem_reset_request(request)) {
+ DRM_DEBUG_DRIVER("resetting %s to restart from tail of request 0x%x\n",
+ engine->name, request->global_seqno);
- DRM_DEBUG_DRIVER("resetting %s to restart from tail of request 0x%x\n",
- engine->name, request->global_seqno);
+ /* If this context is now banned, skip all pending requests. */
+ if (i915_gem_context_is_banned(request->ctx))
+ engine_skip_context(request);
+ }
/* Setup the CS to resume from the breadcrumb of the hung request */
engine->reset_hw(engine, request);
-
- /* If this context is now banned, skip all of its pending requests. */
- if (i915_gem_context_is_banned(request->ctx))
- engine_skip_context(request);
}
void i915_gem_reset_finish(struct drm_i915_private *dev_priv)
/*
* Logical Context regs
*/
-#define CCID _MMIO(0x2180)
-#define CCID_EN (1<<0)
+#define CCID _MMIO(0x2180)
+#define CCID_EN BIT(0)
+#define CCID_EXTENDED_STATE_RESTORE BIT(2)
+#define CCID_EXTENDED_STATE_SAVE BIT(3)
/*
* Notes on SNB/IVB/VLV context size:
* - Power context is saved elsewhere (LLC or stolen)
{
struct drm_i915_private *dev_priv = engine->i915;
struct execlist_port *port = engine->execlist_port;
- struct intel_context *ce = &request->ctx->engine[engine->id];
+ struct intel_context *ce;
+
+ /* If the request was innocent, we leave the request in the ELSP
+ * and will try to replay it on restarting. The context image may
+ * have been corrupted by the reset, in which case we may have
+ * to service a new GPU hang, but more likely we can continue on
+ * without impact.
+ *
+ * If the request was guilty, we presume the context is corrupt
+ * and have to at least restore the RING register in the context
+ * image back to the expected values to skip over the guilty request.
+ */
+ if (!request || request->fence.error != -EIO)
+ return;
/* We want a simple context + ring to execute the breadcrumb update.
* We cannot rely on the context being intact across the GPU hang,
* future request will be after userspace has had the opportunity
* to recreate its own state.
*/
+ ce = &request->ctx->engine[engine->id];
execlists_init_reg_state(ce->lrc_reg_state,
request->ctx, engine, ce->ring);
static void reset_ring_common(struct intel_engine_cs *engine,
struct drm_i915_gem_request *request)
{
- struct intel_ring *ring = request->ring;
+ /* Try to restore the logical GPU state to match the continuation
+ * of the request queue. If we skip the context/PD restore, then
+ * the next request may try to execute assuming that its context
+ * is valid and loaded on the GPU and so may try to access invalid
+ * memory, prompting repeated GPU hangs.
+ *
+ * If the request was guilty, we still restore the logical state
+ * in case the next request requires it (e.g. the aliasing ppgtt),
+ * but skip over the hung batch.
+ *
+ * If the request was innocent, we try to replay the request with
+ * the restored context.
+ */
+ if (request) {
+ struct drm_i915_private *dev_priv = request->i915;
+ struct intel_context *ce = &request->ctx->engine[engine->id];
+ struct i915_hw_ppgtt *ppgtt;
+
+ /* FIXME consider gen8 reset */
+
+ if (ce->state) {
+ I915_WRITE(CCID,
+ i915_ggtt_offset(ce->state) |
+ BIT(8) /* must be set! */ |
+ CCID_EXTENDED_STATE_SAVE |
+ CCID_EXTENDED_STATE_RESTORE |
+ CCID_EN);
+ }
- ring->head = request->postfix;
- ring->last_retired_head = -1;
+ ppgtt = request->ctx->ppgtt ?: engine->i915->mm.aliasing_ppgtt;
+ if (ppgtt) {
+ u32 pd_offset = ppgtt->pd.base.ggtt_offset << 10;
+
+ I915_WRITE(RING_PP_DIR_DCLV(engine), PP_DIR_DCLV_2G);
+ I915_WRITE(RING_PP_DIR_BASE(engine), pd_offset);
+
+ /* Wait for the PD reload to complete */
+ if (intel_wait_for_register(dev_priv,
+ RING_PP_DIR_BASE(engine),
+ BIT(0), 0,
+ 10))
+ DRM_ERROR("Wait for reload of ppgtt page-directory timed out\n");
+
+ ppgtt->pd_dirty_rings &= ~intel_engine_flag(engine);
+ }
+
+ /* If the rq hung, jump to its breadcrumb and skip the batch */
+ if (request->fence.error == -EIO) {
+ struct intel_ring *ring = request->ring;
+
+ ring->head = request->postfix;
+ ring->last_retired_head = -1;
+ }
+ } else {
+ engine->legacy_active_context = NULL;
+ }
}
static int intel_ring_workarounds_emit(struct drm_i915_gem_request *req)
projects / linux.git / commitdiff