From: Rob Clark <robdclark@gmail.com>
To: dri-devel@lists.freedesktop.org
Cc: Daniel Vetter <daniel@ffwll.ch>,
Rob Clark <robdclark@chromium.org>,
Jordan Crouse <jcrouse@codeaurora.org>,
Rob Clark <robdclark@gmail.com>, Sean Paul <sean@poorly.run>,
David Airlie <airlied@linux.ie>, Eric Anholt <eric@anholt.net>,
AngeloGioacchino Del Regno <kholk11@gmail.com>,
Emil Velikov <emil.velikov@collabora.com>,
Jonathan Marek <jonathan@marek.ca>,
Sharat Masetty <smasetty@codeaurora.org>,
linux-arm-msm@vger.kernel.org (open list:DRM DRIVER FOR MSM
ADRENO GPU),
freedreno@lists.freedesktop.org (open list:DRM DRIVER FOR MSM
ADRENO GPU), linux-kernel@vger.kernel.org (open list)
Subject: [PATCH v2 13/22] drm/msm: Document and rename preempt_lock
Date: Sun, 11 Oct 2020 19:09:40 -0700 [thread overview]
Message-ID: <20201012020958.229288-14-robdclark@gmail.com> (raw)
In-Reply-To: <20201012020958.229288-1-robdclark@gmail.com>
From: Rob Clark <robdclark@chromium.org>
Before adding another lock, give ring->lock a more descriptive name.
Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Jordan Crouse <jcrouse@codeaurora.org>
---
drivers/gpu/drm/msm/adreno/a5xx_gpu.c | 4 ++--
drivers/gpu/drm/msm/adreno/a5xx_preempt.c | 12 ++++++------
drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 4 ++--
drivers/gpu/drm/msm/msm_ringbuffer.c | 2 +-
drivers/gpu/drm/msm/msm_ringbuffer.h | 7 ++++++-
5 files changed, 17 insertions(+), 12 deletions(-)
diff --git a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
index c941c8138f25..543437a2186e 100644
--- a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
@@ -36,7 +36,7 @@ void a5xx_flush(struct msm_gpu *gpu, struct msm_ringbuffer *ring,
OUT_RING(ring, upper_32_bits(shadowptr(a5xx_gpu, ring)));
}
- spin_lock_irqsave(&ring->lock, flags);
+ spin_lock_irqsave(&ring->preempt_lock, flags);
/* Copy the shadow to the actual register */
ring->cur = ring->next;
@@ -44,7 +44,7 @@ void a5xx_flush(struct msm_gpu *gpu, struct msm_ringbuffer *ring,
/* Make sure to wrap wptr if we need to */
wptr = get_wptr(ring);
- spin_unlock_irqrestore(&ring->lock, flags);
+ spin_unlock_irqrestore(&ring->preempt_lock, flags);
/* Make sure everything is posted before making a decision */
mb();
diff --git a/drivers/gpu/drm/msm/adreno/a5xx_preempt.c b/drivers/gpu/drm/msm/adreno/a5xx_preempt.c
index 7e04509c4e1f..183de1139eeb 100644
--- a/drivers/gpu/drm/msm/adreno/a5xx_preempt.c
+++ b/drivers/gpu/drm/msm/adreno/a5xx_preempt.c
@@ -45,9 +45,9 @@ static inline void update_wptr(struct msm_gpu *gpu, struct msm_ringbuffer *ring)
if (!ring)
return;
- spin_lock_irqsave(&ring->lock, flags);
+ spin_lock_irqsave(&ring->preempt_lock, flags);
wptr = get_wptr(ring);
- spin_unlock_irqrestore(&ring->lock, flags);
+ spin_unlock_irqrestore(&ring->preempt_lock, flags);
gpu_write(gpu, REG_A5XX_CP_RB_WPTR, wptr);
}
@@ -62,9 +62,9 @@ static struct msm_ringbuffer *get_next_ring(struct msm_gpu *gpu)
bool empty;
struct msm_ringbuffer *ring = gpu->rb[i];
- spin_lock_irqsave(&ring->lock, flags);
+ spin_lock_irqsave(&ring->preempt_lock, flags);
empty = (get_wptr(ring) == ring->memptrs->rptr);
- spin_unlock_irqrestore(&ring->lock, flags);
+ spin_unlock_irqrestore(&ring->preempt_lock, flags);
if (!empty)
return ring;
@@ -132,9 +132,9 @@ void a5xx_preempt_trigger(struct msm_gpu *gpu)
}
/* Make sure the wptr doesn't update while we're in motion */
- spin_lock_irqsave(&ring->lock, flags);
+ spin_lock_irqsave(&ring->preempt_lock, flags);
a5xx_gpu->preempt[ring->id]->wptr = get_wptr(ring);
- spin_unlock_irqrestore(&ring->lock, flags);
+ spin_unlock_irqrestore(&ring->preempt_lock, flags);
/* Set the address of the incoming preemption record */
gpu_write64(gpu, REG_A5XX_CP_CONTEXT_SWITCH_RESTORE_ADDR_LO,
diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
index 8915882e4444..fc85f008d69d 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
@@ -65,7 +65,7 @@ static void a6xx_flush(struct msm_gpu *gpu, struct msm_ringbuffer *ring)
OUT_RING(ring, upper_32_bits(shadowptr(a6xx_gpu, ring)));
}
- spin_lock_irqsave(&ring->lock, flags);
+ spin_lock_irqsave(&ring->preempt_lock, flags);
/* Copy the shadow to the actual register */
ring->cur = ring->next;
@@ -73,7 +73,7 @@ static void a6xx_flush(struct msm_gpu *gpu, struct msm_ringbuffer *ring)
/* Make sure to wrap wptr if we need to */
wptr = get_wptr(ring);
- spin_unlock_irqrestore(&ring->lock, flags);
+ spin_unlock_irqrestore(&ring->preempt_lock, flags);
/* Make sure everything is posted before making a decision */
mb();
diff --git a/drivers/gpu/drm/msm/msm_ringbuffer.c b/drivers/gpu/drm/msm/msm_ringbuffer.c
index 935bf9b1d941..1b6958e908dc 100644
--- a/drivers/gpu/drm/msm/msm_ringbuffer.c
+++ b/drivers/gpu/drm/msm/msm_ringbuffer.c
@@ -46,7 +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->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 0987d6bf848c..4956d1bc5d0e 100644
--- a/drivers/gpu/drm/msm/msm_ringbuffer.h
+++ b/drivers/gpu/drm/msm/msm_ringbuffer.h
@@ -46,7 +46,12 @@ struct msm_ringbuffer {
struct msm_rbmemptrs *memptrs;
uint64_t memptrs_iova;
struct msm_fence_context *fctx;
- spinlock_t lock;
+
+ /*
+ * preempt_lock protects preemption and serializes wptr updates against
+ * preemption. Can be aquired from irq context.
+ */
+ spinlock_t preempt_lock;
};
struct msm_ringbuffer *msm_ringbuffer_new(struct msm_gpu *gpu, int id,
--
2.26.2
next prev parent reply other threads:[~2020-10-12 2:10 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-12 2:09 [PATCH 00/14] drm/msm: de-struct_mutex-ification Rob Clark
2020-10-12 2:09 ` [PATCH v2 01/22] drm/msm/gem: Add obj->lock wrappers Rob Clark
2020-10-12 2:09 ` [PATCH v2 02/22] drm/msm/gem: Rename internal get_iova_locked helper Rob Clark
2020-10-12 2:09 ` [PATCH v2 03/22] drm/msm/gem: Move prototypes to msm_gem.h Rob Clark
2020-10-12 2:09 ` [PATCH v2 04/22] drm/msm/gem: Add some _locked() helpers Rob Clark
2020-10-12 2:09 ` [PATCH v2 05/22] drm/msm/gem: Move locking in shrinker path Rob Clark
2020-10-12 2:09 ` [PATCH v2 06/22] drm/msm/submit: Move copy_from_user ahead of locking bos Rob Clark
2020-10-12 2:09 ` [PATCH v2 07/22] drm/msm: Do rpm get sooner in the submit path Rob Clark
2020-10-12 14:35 ` Daniel Vetter
2020-10-12 15:43 ` Rob Clark
2020-10-20 9:07 ` Viresh Kumar
2020-10-20 10:56 ` Daniel Vetter
2020-10-20 11:24 ` Viresh Kumar
2020-10-20 11:42 ` Daniel Vetter
2020-10-20 14:13 ` Rob Clark
2020-10-22 8:06 ` Viresh Kumar
2020-10-25 17:39 ` Rob Clark
2020-10-27 11:35 ` Viresh Kumar
2020-11-03 5:47 ` Viresh Kumar
2020-11-03 16:50 ` Rob Clark
2020-11-04 3:03 ` Viresh Kumar
2020-11-05 19:24 ` Rob Clark
2020-11-06 7:16 ` Viresh Kumar
2020-11-17 10:03 ` Viresh Kumar
2020-11-17 17:02 ` Rob Clark
2020-11-18 5:28 ` Viresh Kumar
2020-11-18 16:53 ` Rob Clark
2020-11-19 6:05 ` Viresh Kumar
2020-12-07 6:16 ` Viresh Kumar
2020-12-16 5:22 ` Viresh Kumar
2020-10-12 2:09 ` [PATCH v2 08/22] drm/msm/gem: Switch over to obj->resv for locking Rob Clark
2020-10-12 2:09 ` [PATCH v2 09/22] drm/msm: Use correct drm_gem_object_put() in fail case Rob Clark
2020-10-12 2:09 ` [PATCH v2 10/22] drm/msm: Drop chatty trace Rob Clark
2020-10-12 2:09 ` [PATCH v2 11/22] drm/msm: Move update_fences() Rob Clark
2020-10-12 2:09 ` [PATCH v2 12/22] drm/msm: Add priv->mm_lock to protect active/inactive lists Rob Clark
2020-10-12 2:09 ` Rob Clark [this message]
2020-10-12 2:09 ` [PATCH v2 14/22] drm/msm: Protect ring->submits with it's own lock Rob Clark
2020-10-12 2:09 ` [PATCH v2 15/22] drm/msm: Refcount submits Rob Clark
2020-10-12 2:09 ` [PATCH v2 16/22] drm/msm: Remove obj->gpu Rob Clark
2020-10-12 2:09 ` [PATCH v2 17/22] drm/msm: Drop struct_mutex from the retire path Rob Clark
2020-10-12 2:09 ` [PATCH v2 18/22] drm/msm: Drop struct_mutex in free_object() path Rob Clark
2020-10-12 2:09 ` [PATCH v2 19/22] drm/msm: remove msm_gem_free_work Rob Clark
2020-10-12 2:09 ` [PATCH v2 20/22] drm/msm: drop struct_mutex in madvise path Rob Clark
2020-10-12 2:09 ` [PATCH v2 21/22] drm/msm: Drop struct_mutex in shrinker path Rob Clark
2020-10-12 2:09 ` [PATCH v2 22/22] drm/msm: Don't implicit-sync if only a single ring Rob Clark
2020-10-12 14:40 ` Daniel Vetter
2020-10-12 15:07 ` Rob Clark
2020-10-13 11:08 ` Daniel Vetter
2020-10-13 16:15 ` [Freedreno] " Rob Clark
2020-10-15 8:22 ` Daniel Vetter
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