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[73.25.156.94]) by smtp.gmail.com with ESMTPSA id b20sm2517848pft.55.2020.10.23.09.50.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 23 Oct 2020 09:50:47 -0700 (PDT) From: Rob Clark To: dri-devel@lists.freedesktop.org Cc: linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org, Rob Clark , Jordan Crouse , "Kristian H . Kristensen" , Rob Clark , Sean Paul , David Airlie , Daniel Vetter , linux-kernel@vger.kernel.org (open list) Subject: [PATCH v4 15/23] drm/msm: Protect ring->submits with it's own lock Date: Fri, 23 Oct 2020 09:51:16 -0700 Message-Id: <20201023165136.561680-16-robdclark@gmail.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201023165136.561680-1-robdclark@gmail.com> References: <20201023165136.561680-1-robdclark@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org From: Rob Clark One less place to rely on dev->struct_mutex. Signed-off-by: Rob Clark Reviewed-by: Jordan Crouse Reviewed-by: Kristian H. Kristensen --- drivers/gpu/drm/msm/msm_gem_submit.c | 2 ++ drivers/gpu/drm/msm/msm_gpu.c | 37 ++++++++++++++++++++++------ drivers/gpu/drm/msm/msm_ringbuffer.c | 1 + drivers/gpu/drm/msm/msm_ringbuffer.h | 6 +++++ 4 files changed, 39 insertions(+), 7 deletions(-) diff --git a/drivers/gpu/drm/msm/msm_gem_submit.c b/drivers/gpu/drm/msm/msm_gem_submit.c index 044e9bee70a2..24ce4c65429d 100644 --- a/drivers/gpu/drm/msm/msm_gem_submit.c +++ b/drivers/gpu/drm/msm/msm_gem_submit.c @@ -65,7 +65,9 @@ void msm_gem_submit_free(struct msm_gem_submit *submit) unsigned i; dma_fence_put(submit->fence); + spin_lock(&submit->ring->submit_lock); list_del(&submit->node); + spin_unlock(&submit->ring->submit_lock); put_pid(submit->pid); msm_submitqueue_put(submit->queue); diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c index 1667d8066897..1d6f3dc3fe78 100644 --- a/drivers/gpu/drm/msm/msm_gpu.c +++ b/drivers/gpu/drm/msm/msm_gpu.c @@ -270,6 +270,7 @@ static void update_fences(struct msm_gpu *gpu, struct msm_ringbuffer *ring, { struct msm_gem_submit *submit; + spin_lock(&ring->submit_lock); list_for_each_entry(submit, &ring->submits, node) { if (submit->seqno > fence) break; @@ -277,6 +278,7 @@ static void update_fences(struct msm_gpu *gpu, struct msm_ringbuffer *ring, msm_update_fence(submit->ring->fctx, submit->fence->seqno); } + spin_unlock(&ring->submit_lock); } #ifdef CONFIG_DEV_COREDUMP @@ -432,11 +434,14 @@ find_submit(struct msm_ringbuffer *ring, uint32_t fence) { struct msm_gem_submit *submit; - WARN_ON(!mutex_is_locked(&ring->gpu->dev->struct_mutex)); - - list_for_each_entry(submit, &ring->submits, node) - if (submit->seqno == fence) + spin_lock(&ring->submit_lock); + list_for_each_entry(submit, &ring->submits, node) { + if (submit->seqno == fence) { + spin_unlock(&ring->submit_lock); return submit; + } + } + spin_unlock(&ring->submit_lock); return NULL; } @@ -533,8 +538,10 @@ static void recover_worker(struct work_struct *work) for (i = 0; i < gpu->nr_rings; i++) { struct msm_ringbuffer *ring = gpu->rb[i]; + spin_lock(&ring->submit_lock); list_for_each_entry(submit, &ring->submits, node) gpu->funcs->submit(gpu, submit); + spin_unlock(&ring->submit_lock); } } @@ -721,7 +728,6 @@ static void retire_submit(struct msm_gpu *gpu, struct msm_ringbuffer *ring, static void retire_submits(struct msm_gpu *gpu) { struct drm_device *dev = gpu->dev; - struct msm_gem_submit *submit, *tmp; int i; WARN_ON(!mutex_is_locked(&dev->struct_mutex)); @@ -730,9 +736,24 @@ static void retire_submits(struct msm_gpu *gpu) for (i = 0; i < gpu->nr_rings; i++) { struct msm_ringbuffer *ring = gpu->rb[i]; - list_for_each_entry_safe(submit, tmp, &ring->submits, node) { - if (dma_fence_is_signaled(submit->fence)) + while (true) { + struct msm_gem_submit *submit = NULL; + + spin_lock(&ring->submit_lock); + submit = list_first_entry_or_null(&ring->submits, + struct msm_gem_submit, node); + spin_unlock(&ring->submit_lock); + + /* + * If no submit, we are done. If submit->fence hasn't + * been signalled, then later submits are not signalled + * either, so we are also done. + */ + if (submit && dma_fence_is_signaled(submit->fence)) { retire_submit(gpu, ring, submit); + } else { + break; + } } } } @@ -775,7 +796,9 @@ void msm_gpu_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit) submit->seqno = ++ring->seqno; + spin_lock(&ring->submit_lock); list_add_tail(&submit->node, &ring->submits); + spin_unlock(&ring->submit_lock); msm_rd_dump_submit(priv->rd, submit, NULL); diff --git a/drivers/gpu/drm/msm/msm_ringbuffer.c b/drivers/gpu/drm/msm/msm_ringbuffer.c index 1b6958e908dc..4d2a2a4abef8 100644 --- a/drivers/gpu/drm/msm/msm_ringbuffer.c +++ b/drivers/gpu/drm/msm/msm_ringbuffer.c @@ -46,6 +46,7 @@ struct msm_ringbuffer *msm_ringbuffer_new(struct msm_gpu *gpu, int id, ring->memptrs_iova = memptrs_iova; INIT_LIST_HEAD(&ring->submits); + spin_lock_init(&ring->submit_lock); spin_lock_init(&ring->preempt_lock); snprintf(name, sizeof(name), "gpu-ring-%d", ring->id); diff --git a/drivers/gpu/drm/msm/msm_ringbuffer.h b/drivers/gpu/drm/msm/msm_ringbuffer.h index 4956d1bc5d0e..fe55d4a1aa16 100644 --- a/drivers/gpu/drm/msm/msm_ringbuffer.h +++ b/drivers/gpu/drm/msm/msm_ringbuffer.h @@ -39,7 +39,13 @@ struct msm_ringbuffer { int id; struct drm_gem_object *bo; uint32_t *start, *end, *cur, *next; + + /* + * List of in-flight submits on this ring. Protected by submit_lock. + */ struct list_head submits; + spinlock_t submit_lock; + uint64_t iova; uint32_t seqno; uint32_t hangcheck_fence; -- 2.26.2