Re: [PATCH v2] drm/amdgpu: introduce new amdgpu_fence object to indicate the job embedded fence

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On 2021-12-14 6:15 a.m., Huang Rui wrote:
The job embedded fence donesn't initialize the flags at
dma_fence_init(). Then we will go a wrong way in
amdgpu_fence_get_timeline_name callback and trigger a null pointer panic
once we enabled the trace event here. So introduce new amdgpu_fence
object to indicate the job embedded fence.

[  156.131790] BUG: kernel NULL pointer dereference, address: 00000000000002a0
[  156.131804] #PF: supervisor read access in kernel mode
[  156.131811] #PF: error_code(0x0000) - not-present page
[  156.131817] PGD 0 P4D 0
[  156.131824] Oops: 0000 [#1] PREEMPT SMP PTI
[  156.131832] CPU: 6 PID: 1404 Comm: sdma0 Tainted: G           OE     5.16.0-rc1-custom #1
[  156.131842] Hardware name: Gigabyte Technology Co., Ltd. Z170XP-SLI/Z170XP-SLI-CF, BIOS F20 11/04/2016
[  156.131848] RIP: 0010:strlen+0x0/0x20
[  156.131859] Code: 89 c0 c3 0f 1f 80 00 00 00 00 48 01 fe eb 0f 0f b6 07 38 d0 74 10 48 83 c7 01 84 c0 74 05 48 39 f7 75 ec 31 c0 c3 48 89 f8 c3 <80> 3f 00 74 10 48 89 f8 48 83 c0 01 80 38 00 75 f7 48 29 f8 c3 31
[  156.131872] RSP: 0018:ffff9bd0018dbcf8 EFLAGS: 00010206
[  156.131880] RAX: 00000000000002a0 RBX: ffff8d0305ef01b0 RCX: 000000000000000b
[  156.131888] RDX: ffff8d03772ab924 RSI: ffff8d0305ef01b0 RDI: 00000000000002a0
[  156.131895] RBP: ffff9bd0018dbd60 R08: ffff8d03002094d0 R09: 0000000000000000
[  156.131901] R10: 000000000000005e R11: 0000000000000065 R12: ffff8d03002094d0
[  156.131907] R13: 000000000000001f R14: 0000000000070018 R15: 0000000000000007
[  156.131914] FS:  0000000000000000(0000) GS:ffff8d062ed80000(0000) knlGS:0000000000000000
[  156.131923] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  156.131929] CR2: 000000amdgpu_job_alloc00000002a0 CR3: 000000001120a005 CR4: 00000000003706e0
[  156.131937] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  156.131942] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  156.131949] Call Trace:
[  156.131953]  <TASK>
[  156.131957]  ? trace_event_raw_event_dma_fence+0xcc/0x200
[  156.131973]  ? ring_buffer_unlock_commit+0x23/0x130
[  156.131982]  dma_fence_init+0x92/0xb0
[  156.131993]  amdgpu_fence_emit+0x10d/0x2b0 [amdgpu]
[  156.132302]  amdgpu_ib_schedule+0x2f9/0x580 [amdgpu]
[  156.132586]  amdgpu_job_run+0xed/0x220 [amdgpu]

Signed-off-by: Huang Rui <ray.huang@xxxxxxx>
---
  drivers/gpu/drm/amd/amdgpu/amdgpu.h        |   1 +
  drivers/gpu/drm/amd/amdgpu/amdgpu_device.c |   3 +-
  drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c  | 117 ++++++++++++++-------
  drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h   |   3 -
  4 files changed, 80 insertions(+), 44 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index 9f017663ac50..fcaf6e9703f9 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -444,6 +444,7 @@ struct amdgpu_sa_bo {
int amdgpu_fence_slab_init(void);
  void amdgpu_fence_slab_fini(void);
+bool is_job_embedded_fence(struct dma_fence *f);
/*
   * IRQS.
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 5625f7736e37..444a19eb2248 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -4483,9 +4483,8 @@ int amdgpu_device_pre_asic_reset(struct amdgpu_device *adev,
ptr = &ring->fence_drv.fences[j];
  			old = rcu_dereference_protected(*ptr, 1);
-			if (old && test_bit(AMDGPU_FENCE_FLAG_EMBED_IN_JOB_BIT, &old->flags)) {
+			if (old && is_job_embedded_fence(old))
  				RCU_INIT_POINTER(*ptr, NULL);
-			}
  		}
  		/* after all hw jobs are reset, hw fence is meaningless, so force_completion */
  		amdgpu_fence_driver_force_completion(ring);
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
index 3b7e86ea7167..3a81249b5660 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
@@ -77,16 +77,28 @@ void amdgpu_fence_slab_fini(void)
   * Cast helper
   */
  static const struct dma_fence_ops amdgpu_fence_ops;
+static const struct dma_fence_ops amdgpu_job_fence_ops;
  static inline struct amdgpu_fence *to_amdgpu_fence(struct dma_fence *f)
  {
  	struct amdgpu_fence *__f = container_of(f, struct amdgpu_fence, base);
- if (__f->base.ops == &amdgpu_fence_ops)
+	if (__f->base.ops == &amdgpu_fence_ops ||
+	    __f->base.ops == &amdgpu_job_fence_ops)
  		return __f;
return NULL;
  }
+bool is_job_embedded_fence(struct dma_fence *f)
+{
+	struct amdgpu_fence *__f = container_of(f, struct amdgpu_fence, base);
+
+	if (__f->base.ops == &amdgpu_job_fence_ops)
+		return true;
+
+	return false;
+}
+
  /**
   * amdgpu_fence_write - write a fence value
   *
@@ -158,19 +170,18 @@ int amdgpu_fence_emit(struct amdgpu_ring *ring, struct dma_fence **f, struct amd
  	}
seq = ++ring->fence_drv.sync_seq;
-	if (job != NULL && job->job_run_counter) {
+	if (job && job->job_run_counter) {
  		/* reinit seq for resubmitted jobs */
  		fence->seqno = seq;
  	} else {
-		dma_fence_init(fence, &amdgpu_fence_ops,
-				&ring->fence_drv.lock,
-				adev->fence_context + ring->idx,
-				seq);
-	}
-
-	if (job != NULL) {
-		/* mark this fence has a parent job */
-		set_bit(AMDGPU_FENCE_FLAG_EMBED_IN_JOB_BIT, &fence->flags);
+		if (job)
+			dma_fence_init(fence, &amdgpu_job_fence_ops,
+				       &ring->fence_drv.lock,
+				       adev->fence_context + ring->idx, seq);
+		else
+			dma_fence_init(fence, &amdgpu_fence_ops,
+				       &ring->fence_drv.lock,
+				       adev->fence_context + ring->idx, seq);
  	}


It's probably me missing something but why can't we just move setting of AMDGPU_FENCE_FLAG_EMBED_IN_JOB_BIT to before dma_fence_init here or even into amdgpu_job_alloc instead of all the refactoring ?

Andrey


amdgpu_ring_emit_fence(ring, ring->fence_drv.gpu_addr,
@@ -643,16 +654,14 @@ static const char *amdgpu_fence_get_driver_name(struct dma_fence *fence)
static const char *amdgpu_fence_get_timeline_name(struct dma_fence *f)
  {
-	struct amdgpu_ring *ring;
+	return (const char *)to_amdgpu_fence(f)->ring->name;
+}
- if (test_bit(AMDGPU_FENCE_FLAG_EMBED_IN_JOB_BIT, &f->flags)) {
-		struct amdgpu_job *job = container_of(f, struct amdgpu_job, hw_fence);
+static const char *amdgpu_job_fence_get_timeline_name(struct dma_fence *f)
+{
+	struct amdgpu_job *job = container_of(f, struct amdgpu_job, hw_fence);
- ring = to_amdgpu_ring(job->base.sched);
-	} else {
-		ring = to_amdgpu_fence(f)->ring;
-	}
-	return (const char *)ring->name;
+	return (const char *)to_amdgpu_ring(job->base.sched)->name;
  }
/**
@@ -665,18 +674,25 @@ static const char *amdgpu_fence_get_timeline_name(struct dma_fence *f)
   */
  static bool amdgpu_fence_enable_signaling(struct dma_fence *f)
  {
-	struct amdgpu_ring *ring;
+	if (!timer_pending(&to_amdgpu_fence(f)->ring->fence_drv.fallback_timer))
+		amdgpu_fence_schedule_fallback(to_amdgpu_fence(f)->ring);
- if (test_bit(AMDGPU_FENCE_FLAG_EMBED_IN_JOB_BIT, &f->flags)) {
-		struct amdgpu_job *job = container_of(f, struct amdgpu_job, hw_fence);
+	return true;
+}
- ring = to_amdgpu_ring(job->base.sched);
-	} else {
-		ring = to_amdgpu_fence(f)->ring;
-	}
+/**
+ * amdgpu_job_fence_enable_signaling - enable signalling on job fence
+ * @f: fence
+ *
+ * This is the simliar function with amdgpu_fence_enable_signaling above, it
+ * only handles the job embedded fence.
+ */
+static bool amdgpu_job_fence_enable_signaling(struct dma_fence *f)
+{
+	struct amdgpu_job *job = container_of(f, struct amdgpu_job, hw_fence);
- if (!timer_pending(&ring->fence_drv.fallback_timer))
-		amdgpu_fence_schedule_fallback(ring);
+	if (!timer_pending(&to_amdgpu_ring(job->base.sched)->fence_drv.fallback_timer))
+		amdgpu_fence_schedule_fallback(to_amdgpu_ring(job->base.sched));
return true;
  }
@@ -692,19 +708,23 @@ static void amdgpu_fence_free(struct rcu_head *rcu)
  {
  	struct dma_fence *f = container_of(rcu, struct dma_fence, rcu);
- if (test_bit(AMDGPU_FENCE_FLAG_EMBED_IN_JOB_BIT, &f->flags)) {
-	/* free job if fence has a parent job */
-		struct amdgpu_job *job;
-
-		job = container_of(f, struct amdgpu_job, hw_fence);
-		kfree(job);
-	} else {
  	/* free fence_slab if it's separated fence*/
-		struct amdgpu_fence *fence;
+	kmem_cache_free(amdgpu_fence_slab, to_amdgpu_fence(f));
+}
- fence = to_amdgpu_fence(f);
-		kmem_cache_free(amdgpu_fence_slab, fence);
-	}
+/**
+ * amdgpu_job_fence_free - free up the job with embedded fence
+ *
+ * @rcu: RCU callback head
+ *
+ * Free up the job with embedded fence after the RCU grace period.
+ */
+static void amdgpu_job_fence_free(struct rcu_head *rcu)
+{
+	struct dma_fence *f = container_of(rcu, struct dma_fence, rcu);
+
+	/* free job if fence has a parent job */
+	kfree(container_of(f, struct amdgpu_job, hw_fence));
  }
/**
@@ -720,6 +740,19 @@ static void amdgpu_fence_release(struct dma_fence *f)
  	call_rcu(&f->rcu, amdgpu_fence_free);
  }
+/**
+ * amdgpu_job_fence_release - callback that job embedded fence can be freed
+ *
+ * @f: fence
+ *
+ * This is the simliar function with amdgpu_fence_release above, it
+ * only handles the job embedded fence.
+ */
+static void amdgpu_job_fence_release(struct dma_fence *f)
+{
+	call_rcu(&f->rcu, amdgpu_job_fence_free);
+}
+
  static const struct dma_fence_ops amdgpu_fence_ops = {
  	.get_driver_name = amdgpu_fence_get_driver_name,
  	.get_timeline_name = amdgpu_fence_get_timeline_name,
@@ -727,6 +760,12 @@ static const struct dma_fence_ops amdgpu_fence_ops = {
  	.release = amdgpu_fence_release,
  };
+static const struct dma_fence_ops amdgpu_job_fence_ops = {
+	.get_driver_name = amdgpu_fence_get_driver_name,
+	.get_timeline_name = amdgpu_job_fence_get_timeline_name,
+	.enable_signaling = amdgpu_job_fence_enable_signaling,
+	.release = amdgpu_job_fence_release,
+};
/*
   * Fence debugfs
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
index 4d380e79752c..c29554cf6e63 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
@@ -53,9 +53,6 @@ enum amdgpu_ring_priority_level {
  #define AMDGPU_FENCE_FLAG_INT           (1 << 1)
  #define AMDGPU_FENCE_FLAG_TC_WB_ONLY    (1 << 2)
-/* fence flag bit to indicate the face is embedded in job*/
-#define AMDGPU_FENCE_FLAG_EMBED_IN_JOB_BIT		(DMA_FENCE_FLAG_USER_BITS + 1)
-
  #define to_amdgpu_ring(s) container_of((s), struct amdgpu_ring, sched)
#define AMDGPU_IB_POOL_SIZE (1024 * 1024)



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