From 60456d5c2d25cbe91cd0747d12ec9d909bf8d5b9 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Tue, 26 Sep 2017 16:34:09 +0100 Subject: [PATCH] drm/i915/selftests: Replace wmb() with i915_gem_chipset_flush() Currently, we are being fairly lazy and only using a wmb() following an update to an active batch. Previously, we have found that to be insufficient to ensure that a write from the CPU reaches memory in a timely fashion, and in some caches we may need to flush a chipset cache. To that end, we have i915_gem_chipset_flush() so use it. Suggested-by: Mika Kuoppala Signed-off-by: Chris Wilson Cc: Mika Kuoppala Link: https://patchwork.freedesktop.org/patch/msgid/20170926153409.7928-1-chris@chris-wilson.co.uk Reviewed-by: Joonas Lahtinen --- drivers/gpu/drm/i915/selftests/i915_gem_request.c | 10 +++++++--- drivers/gpu/drm/i915/selftests/intel_hangcheck.c | 7 +++++-- 2 files changed, 12 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_request.c b/drivers/gpu/drm/i915/selftests/i915_gem_request.c index 6664cb2eb0b8..78b9f811707f 100644 --- a/drivers/gpu/drm/i915/selftests/i915_gem_request.c +++ b/drivers/gpu/drm/i915/selftests/i915_gem_request.c @@ -418,7 +418,10 @@ static struct i915_vma *empty_batch(struct drm_i915_private *i915) err = PTR_ERR(cmd); goto err; } + *cmd = MI_BATCH_BUFFER_END; + i915_gem_chipset_flush(i915); + i915_gem_object_unpin_map(obj); err = i915_gem_object_set_to_gtt_domain(obj, false); @@ -605,8 +608,8 @@ static struct i915_vma *recursive_batch(struct drm_i915_private *i915) *cmd++ = lower_32_bits(vma->node.start); } *cmd++ = MI_BATCH_BUFFER_END; /* terminate early in case of error */ + i915_gem_chipset_flush(i915); - wmb(); i915_gem_object_unpin_map(obj); return vma; @@ -625,7 +628,7 @@ static int recursive_batch_resolve(struct i915_vma *batch) return PTR_ERR(cmd); *cmd = MI_BATCH_BUFFER_END; - wmb(); + i915_gem_chipset_flush(batch->vm->i915); i915_gem_object_unpin_map(batch->obj); @@ -858,7 +861,8 @@ out_request: I915_MAP_WC); if (!IS_ERR(cmd)) { *cmd = MI_BATCH_BUFFER_END; - wmb(); + i915_gem_chipset_flush(i915); + i915_gem_object_unpin_map(request[id]->batch->obj); } diff --git a/drivers/gpu/drm/i915/selftests/intel_hangcheck.c b/drivers/gpu/drm/i915/selftests/intel_hangcheck.c index 377c1de766ce..08159b268893 100644 --- a/drivers/gpu/drm/i915/selftests/intel_hangcheck.c +++ b/drivers/gpu/drm/i915/selftests/intel_hangcheck.c @@ -165,6 +165,7 @@ static int emit_recurse_batch(struct hang *h, *batch++ = lower_32_bits(vma->node.start); } *batch++ = MI_BATCH_BUFFER_END; /* not reached */ + i915_gem_chipset_flush(h->i915); flags = 0; if (INTEL_GEN(vm->i915) <= 5) @@ -231,7 +232,7 @@ static u32 hws_seqno(const struct hang *h, static void hang_fini(struct hang *h) { *h->batch = MI_BATCH_BUFFER_END; - wmb(); + i915_gem_chipset_flush(h->i915); i915_gem_object_unpin_map(h->obj); i915_gem_object_put(h->obj); @@ -275,6 +276,8 @@ static int igt_hang_sanitycheck(void *arg) i915_gem_request_get(rq); *h.batch = MI_BATCH_BUFFER_END; + i915_gem_chipset_flush(i915); + __i915_add_request(rq, true); timeout = i915_wait_request(rq, @@ -765,7 +768,7 @@ static int igt_reset_queue(void *arg) pr_info("%s: Completed %d resets\n", engine->name, count); *h.batch = MI_BATCH_BUFFER_END; - wmb(); + i915_gem_chipset_flush(i915); i915_gem_request_put(prev); }