[PATCH 1/2] drm//amdgpu: Add job fence to resv conditionally

[PATCH 1/2] drm//amdgpu: Add job fence to resv conditionally

[xinhui pan]

If a job need sync the bo resv, it is likely that bo need the job fence
to sync with others.

Cc: Christian König <christian.koenig@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Felix Kuehling <Felix.Kuehling@amd.com>
Suggested-by: Christian König <christian.koenig@amd.com>
Signed-off-by: xinhui pan <xinhui.pan@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h      | 5 +++++
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c | 9 +++++++++
 2 files changed, 14 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
index b5705fcfc935..ca6021b4200b 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
@@ -226,6 +226,11 @@ struct amdgpu_vm_update_params {
 	 * @num_dw_left: number of dw left for the IB
 	 */
 	unsigned int num_dw_left;
+
+	/**
+	 * @resv: sync the resv and add job fence to it conditionally.
+	 */
+	struct dma_resv *resv;
 };
 
 struct amdgpu_vm_update_funcs {
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c
index 4cc7881f438c..0cfac59bff36 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c
@@ -70,6 +70,8 @@ static int amdgpu_vm_sdma_prepare(struct amdgpu_vm_update_params *p,
 
 	p->num_dw_left = ndw;
 
+	p->resv = resv;
+
 	if (!resv)
 		return 0;
 
@@ -111,6 +113,13 @@ static int amdgpu_vm_sdma_commit(struct amdgpu_vm_update_params *p,
 		swap(p->vm->last_delayed, tmp);
 	dma_fence_put(tmp);
 
+	/* add job fence to resv.
+	 * MM notifier path is an exception as we can not grab the
+	 * resv lock.
+	 */
+	if (!p->direct && p->resv)
+		dma_resv_add_shared_fence(p->resv, f);
+
 	if (fence && !p->direct)
 		swap(*fence, f);
 	dma_fence_put(f);
-- 
2.17.1

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[PATCH 2/2] drm/amdgpu: unref the bo after job submit

[xinhui pan]

Otherwise we might free BOs before job has completed.
We add the fence to BO after commit, so free BOs after that.

Cc: Christian König <christian.koenig@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: xinhui pan <xinhui.pan@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 29 +++++++++++++++++---------
 1 file changed, 19 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 73398831196f..cdfc26535c7d 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -942,13 +942,17 @@ static int amdgpu_vm_alloc_pts(struct amdgpu_device *adev,
  *
  * @entry: PDE to free
  */
-static void amdgpu_vm_free_table(struct amdgpu_vm_pt *entry)
+static void amdgpu_vm_free_table(struct amdgpu_vm_pt *entry,
+					struct list_head *head)
 {
 	if (entry->base.bo) {
 		entry->base.bo->vm_bo = NULL;
 		list_del(&entry->base.vm_status);
-		amdgpu_bo_unref(&entry->base.bo->shadow);
-		amdgpu_bo_unref(&entry->base.bo);
+		if (!head) {
+			amdgpu_bo_unref(&entry->base.bo->shadow);
+			amdgpu_bo_unref(&entry->base.bo);
+		} else
+			list_add(&entry->base.vm_status, head);
 	}
 	kvfree(entry->entries);
 	entry->entries = NULL;
@@ -965,7 +969,8 @@ static void amdgpu_vm_free_table(struct amdgpu_vm_pt *entry)
  */
 static void amdgpu_vm_free_pts(struct amdgpu_device *adev,
 			       struct amdgpu_vm *vm,
-			       struct amdgpu_vm_pt_cursor *start)
+			       struct amdgpu_vm_pt_cursor *start,
+				   struct list_head *head)
 {
 	struct amdgpu_vm_pt_cursor cursor;
 	struct amdgpu_vm_pt *entry;
@@ -973,10 +978,10 @@ static void amdgpu_vm_free_pts(struct amdgpu_device *adev,
 	vm->bulk_moveable = false;
 
 	for_each_amdgpu_vm_pt_dfs_safe(adev, vm, start, cursor, entry)
-		amdgpu_vm_free_table(entry);
+		amdgpu_vm_free_table(entry, head);
 
 	if (start)
-		amdgpu_vm_free_table(start->entry);
+		amdgpu_vm_free_table(start->entry, head);
 }
 
 /**
@@ -1428,7 +1433,8 @@ static void amdgpu_vm_fragment(struct amdgpu_vm_update_params *params,
  */
 static int amdgpu_vm_update_ptes(struct amdgpu_vm_update_params *params,
 				 uint64_t start, uint64_t end,
-				 uint64_t dst, uint64_t flags)
+				 uint64_t dst, uint64_t flags,
+				 struct list_head *head)
 {
 	struct amdgpu_device *adev = params->adev;
 	struct amdgpu_vm_pt_cursor cursor;
@@ -1539,7 +1545,7 @@ static int amdgpu_vm_update_ptes(struct amdgpu_vm_update_params *params,
 			 * completely covered by the range and so potentially still in use.
 			 */
 			while (cursor.pfn < frag_start) {
-				amdgpu_vm_free_pts(adev, params->vm, &cursor);
+				amdgpu_vm_free_pts(adev, params->vm, &cursor, head);
 				amdgpu_vm_pt_next(adev, &cursor);
 			}
 
@@ -1582,6 +1588,7 @@ static int amdgpu_vm_bo_update_mapping(struct amdgpu_device *adev,
 	struct amdgpu_vm_update_params params;
 	enum amdgpu_sync_mode sync_mode;
 	int r;
+	struct list_head head;
 
 	memset(&params, 0, sizeof(params));
 	params.adev = adev;
@@ -1589,6 +1596,8 @@ static int amdgpu_vm_bo_update_mapping(struct amdgpu_device *adev,
 	params.direct = direct;
 	params.pages_addr = pages_addr;
 
+	INIT_LIST_HEAD(&head);
+
 	/* Implicitly sync to command submissions in the same VM before
 	 * unmapping. Sync to moving fences before mapping.
 	 */
@@ -1617,7 +1626,7 @@ static int amdgpu_vm_bo_update_mapping(struct amdgpu_device *adev,
 	if (r)
 		goto error_unlock;
 
-	r = amdgpu_vm_update_ptes(&params, start, last + 1, addr, flags);
+	r = amdgpu_vm_update_ptes(&params, start, last + 1, addr, flags, &head);
 	if (r)
 		goto error_unlock;
 
@@ -3118,7 +3127,7 @@ void amdgpu_vm_fini(struct amdgpu_device *adev, struct amdgpu_vm *vm)
 		amdgpu_vm_free_mapping(adev, vm, mapping, NULL);
 	}
 
-	amdgpu_vm_free_pts(adev, vm, NULL);
+	amdgpu_vm_free_pts(adev, vm, NULL, NULL);
 	amdgpu_bo_unreserve(root);
 	amdgpu_bo_unref(&root);
 	WARN_ON(vm->root.base.bo);
-- 
2.17.1

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Re: [PATCH 1/2] drm//amdgpu: Add job fence to resv conditionally

[Pan, Xinhui]

wait, this causes test case in Sl+ state. need take a look.
 
> 2020年3月13日 19:53，Pan, Xinhui <Xinhui.Pan@amd.com> 写道：
> 
> If a job need sync the bo resv, it is likely that bo need the job fence
> to sync with others.
> 
> Cc: Christian König <christian.koenig@amd.com>
> Cc: Alex Deucher <alexander.deucher@amd.com>
> Cc: Felix Kuehling <Felix.Kuehling@amd.com>
> Suggested-by: Christian König <christian.koenig@amd.com>
> Signed-off-by: xinhui pan <xinhui.pan@amd.com>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h      | 5 +++++
> drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c | 9 +++++++++
> 2 files changed, 14 insertions(+)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
> index b5705fcfc935..ca6021b4200b 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
> @@ -226,6 +226,11 @@ struct amdgpu_vm_update_params {
> 	 * @num_dw_left: number of dw left for the IB
> 	 */
> 	unsigned int num_dw_left;
> +
> +	/**
> +	 * @resv: sync the resv and add job fence to it conditionally.
> +	 */
> +	struct dma_resv *resv;
> };
> 
> struct amdgpu_vm_update_funcs {
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c
> index 4cc7881f438c..0cfac59bff36 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c
> @@ -70,6 +70,8 @@ static int amdgpu_vm_sdma_prepare(struct amdgpu_vm_update_params *p,
> 
> 	p->num_dw_left = ndw;
> 
> +	p->resv = resv;
> +
> 	if (!resv)
> 		return 0;
> 
> @@ -111,6 +113,13 @@ static int amdgpu_vm_sdma_commit(struct amdgpu_vm_update_params *p,
> 		swap(p->vm->last_delayed, tmp);
> 	dma_fence_put(tmp);
> 
> +	/* add job fence to resv.
> +	 * MM notifier path is an exception as we can not grab the
> +	 * resv lock.
> +	 */
> +	if (!p->direct && p->resv)
> +		dma_resv_add_shared_fence(p->resv, f);
> +
> 	if (fence && !p->direct)
> 		swap(*fence, f);
> 	dma_fence_put(f);
> -- 
> 2.17.1
> 

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Re: [PATCH 1/2] drm//amdgpu: Add job fence to resv conditionally

[Christian König]

Am 13.03.20 um 12:53 schrieb xinhui pan:
> If a job need sync the bo resv, it is likely that bo need the job fence
> to sync with others.

That won't work because this is the wrong resv object :)

You added the fence to the mapped BO and not the page table.

No wonder that this doesn't work,
Christian.

>
> Cc: Christian König <christian.koenig@amd.com>
> Cc: Alex Deucher <alexander.deucher@amd.com>
> Cc: Felix Kuehling <Felix.Kuehling@amd.com>
> Suggested-by: Christian König <christian.koenig@amd.com>
> Signed-off-by: xinhui pan <xinhui.pan@amd.com>
> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h      | 5 +++++
>   drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c | 9 +++++++++
>   2 files changed, 14 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
> index b5705fcfc935..ca6021b4200b 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
> @@ -226,6 +226,11 @@ struct amdgpu_vm_update_params {
>   	 * @num_dw_left: number of dw left for the IB
>   	 */
>   	unsigned int num_dw_left;
> +
> +	/**
> +	 * @resv: sync the resv and add job fence to it conditionally.
> +	 */
> +	struct dma_resv *resv;
>   };
>   
>   struct amdgpu_vm_update_funcs {
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c
> index 4cc7881f438c..0cfac59bff36 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c
> @@ -70,6 +70,8 @@ static int amdgpu_vm_sdma_prepare(struct amdgpu_vm_update_params *p,
>   
>   	p->num_dw_left = ndw;
>   
> +	p->resv = resv;
> +
>   	if (!resv)
>   		return 0;
>   
> @@ -111,6 +113,13 @@ static int amdgpu_vm_sdma_commit(struct amdgpu_vm_update_params *p,
>   		swap(p->vm->last_delayed, tmp);
>   	dma_fence_put(tmp);
>   
> +	/* add job fence to resv.
> +	 * MM notifier path is an exception as we can not grab the
> +	 * resv lock.
> +	 */
> +	if (!p->direct && p->resv)
> +		dma_resv_add_shared_fence(p->resv, f);
> +
>   	if (fence && !p->direct)
>   		swap(*fence, f);
>   	dma_fence_put(f);

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Re: [PATCH 1/2] drm//amdgpu: Add job fence to resv conditionally

[Pan, Xinhui]

[-- Attachment #1.1: Type: text/plain, Size: 2922 bytes --]

[AMD Official Use Only - Internal Distribution Only]

page table BOs share same resv.It should be ok using any of them, root bo resv or bo resv.
I forgot to unref bos which cause problems. not good at rebasing...


________________________________
From: Koenig, Christian <Christian.Koenig@amd.com>
Sent: Friday, March 13, 2020 9:34:42 PM
To: Pan, Xinhui <Xinhui.Pan@amd.com>; amd-gfx@lists.freedesktop.org <amd-gfx@lists.freedesktop.org>
Cc: Deucher, Alexander <Alexander.Deucher@amd.com>; Kuehling, Felix <Felix.Kuehling@amd.com>
Subject: Re: [PATCH 1/2] drm//amdgpu: Add job fence to resv conditionally

Am 13.03.20 um 12:53 schrieb xinhui pan:
> If a job need sync the bo resv, it is likely that bo need the job fence
> to sync with others.

That won't work because this is the wrong resv object :)

You added the fence to the mapped BO and not the page table.

No wonder that this doesn't work,
Christian.

>
> Cc: Christian König <christian.koenig@amd.com>
> Cc: Alex Deucher <alexander.deucher@amd.com>
> Cc: Felix Kuehling <Felix.Kuehling@amd.com>
> Suggested-by: Christian König <christian.koenig@amd.com>
> Signed-off-by: xinhui pan <xinhui.pan@amd.com>
> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h      | 5 +++++
>   drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c | 9 +++++++++
>   2 files changed, 14 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
> index b5705fcfc935..ca6021b4200b 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
> @@ -226,6 +226,11 @@ struct amdgpu_vm_update_params {
>         * @num_dw_left: number of dw left for the IB
>         */
>        unsigned int num_dw_left;
> +
> +     /**
> +      * @resv: sync the resv and add job fence to it conditionally.
> +      */
> +     struct dma_resv *resv;
>   };
>
>   struct amdgpu_vm_update_funcs {
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c
> index 4cc7881f438c..0cfac59bff36 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c
> @@ -70,6 +70,8 @@ static int amdgpu_vm_sdma_prepare(struct amdgpu_vm_update_params *p,
>
>        p->num_dw_left = ndw;
>
> +     p->resv = resv;
> +
>        if (!resv)
>                return 0;
>
> @@ -111,6 +113,13 @@ static int amdgpu_vm_sdma_commit(struct amdgpu_vm_update_params *p,
>                swap(p->vm->last_delayed, tmp);
>        dma_fence_put(tmp);
>
> +     /* add job fence to resv.
> +      * MM notifier path is an exception as we can not grab the
> +      * resv lock.
> +      */
> +     if (!p->direct && p->resv)
> +             dma_resv_add_shared_fence(p->resv, f);
> +
>        if (fence && !p->direct)
>                swap(*fence, f);
>        dma_fence_put(f);


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Re: [PATCH 1/2] drm//amdgpu: Add job fence to resv conditionally

[Pan, Xinhui]

[-- Attachment #1.1: Type: text/plain, Size: 2936 bytes --]

[AMD Official Use Only - Internal Distribution Only]

page table BOs share same resv.It should be ok using any of them, root bo resv or bo resv.
I forgot to unref bos which cause problems. not good at rebasing...

thanks
xinhui
________________________________
From: Koenig, Christian <Christian.Koenig@amd.com>
Sent: Friday, March 13, 2020 9:34:42 PM
To: Pan, Xinhui <Xinhui.Pan@amd.com>; amd-gfx@lists.freedesktop.org <amd-gfx@lists.freedesktop.org>
Cc: Deucher, Alexander <Alexander.Deucher@amd.com>; Kuehling, Felix <Felix.Kuehling@amd.com>
Subject: Re: [PATCH 1/2] drm//amdgpu: Add job fence to resv conditionally

Am 13.03.20 um 12:53 schrieb xinhui pan:
> If a job need sync the bo resv, it is likely that bo need the job fence
> to sync with others.

That won't work because this is the wrong resv object :)

You added the fence to the mapped BO and not the page table.

No wonder that this doesn't work,
Christian.

>
> Cc: Christian König <christian.koenig@amd.com>
> Cc: Alex Deucher <alexander.deucher@amd.com>
> Cc: Felix Kuehling <Felix.Kuehling@amd.com>
> Suggested-by: Christian König <christian.koenig@amd.com>
> Signed-off-by: xinhui pan <xinhui.pan@amd.com>
> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h      | 5 +++++
>   drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c | 9 +++++++++
>   2 files changed, 14 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
> index b5705fcfc935..ca6021b4200b 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
> @@ -226,6 +226,11 @@ struct amdgpu_vm_update_params {
>         * @num_dw_left: number of dw left for the IB
>         */
>        unsigned int num_dw_left;
> +
> +     /**
> +      * @resv: sync the resv and add job fence to it conditionally.
> +      */
> +     struct dma_resv *resv;
>   };
>
>   struct amdgpu_vm_update_funcs {
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c
> index 4cc7881f438c..0cfac59bff36 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c
> @@ -70,6 +70,8 @@ static int amdgpu_vm_sdma_prepare(struct amdgpu_vm_update_params *p,
>
>        p->num_dw_left = ndw;
>
> +     p->resv = resv;
> +
>        if (!resv)
>                return 0;
>
> @@ -111,6 +113,13 @@ static int amdgpu_vm_sdma_commit(struct amdgpu_vm_update_params *p,
>                swap(p->vm->last_delayed, tmp);
>        dma_fence_put(tmp);
>
> +     /* add job fence to resv.
> +      * MM notifier path is an exception as we can not grab the
> +      * resv lock.
> +      */
> +     if (!p->direct && p->resv)
> +             dma_resv_add_shared_fence(p->resv, f);
> +
>        if (fence && !p->direct)
>                swap(*fence, f);
>        dma_fence_put(f);


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Re: [PATCH 1/2] drm//amdgpu: Add job fence to resv conditionally

[Christian König]

[-- Attachment #1.1: Type: text/plain, Size: 3563 bytes --]

Yeah, but this is still the wrong resv object :)

See the object passed to amdgpu_vm_sdma_prepare() is the one of the BO 
which is mapped into the page tables and NOT the one of the page tables.

You need to use p->vm->root.base.bo->tbo.base.resv here.

Regards,
Christian.

Am 13.03.20 um 14:43 schrieb Pan, Xinhui:
>
> [AMD Official Use Only - Internal Distribution Only]
>
>
> page table BOs share same resv.It should be ok using any of them, root 
> bo resv or bo resv.
> I forgot to unref bos which cause problems. not good at rebasing...
>
>
> ------------------------------------------------------------------------
> *From:* Koenig, Christian <Christian.Koenig@amd.com>
> *Sent:* Friday, March 13, 2020 9:34:42 PM
> *To:* Pan, Xinhui <Xinhui.Pan@amd.com>; amd-gfx@lists.freedesktop.org 
> <amd-gfx@lists.freedesktop.org>
> *Cc:* Deucher, Alexander <Alexander.Deucher@amd.com>; Kuehling, Felix 
> <Felix.Kuehling@amd.com>
> *Subject:* Re: [PATCH 1/2] drm//amdgpu: Add job fence to resv 
> conditionally
> Am 13.03.20 um 12:53 schrieb xinhui pan:
> > If a job need sync the bo resv, it is likely that bo need the job fence
> > to sync with others.
>
> That won't work because this is the wrong resv object :)
>
> You added the fence to the mapped BO and not the page table.
>
> No wonder that this doesn't work,
> Christian.
>
> >
> > Cc: Christian König <christian.koenig@amd.com>
> > Cc: Alex Deucher <alexander.deucher@amd.com>
> > Cc: Felix Kuehling <Felix.Kuehling@amd.com>
> > Suggested-by: Christian König <christian.koenig@amd.com>
> > Signed-off-by: xinhui pan <xinhui.pan@amd.com>
> > ---
> >   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h      | 5 +++++
> >   drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c | 9 +++++++++
> >   2 files changed, 14 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h 
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
> > index b5705fcfc935..ca6021b4200b 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
> > @@ -226,6 +226,11 @@ struct amdgpu_vm_update_params {
> >         * @num_dw_left: number of dw left for the IB
> >         */
> >        unsigned int num_dw_left;
> > +
> > +     /**
> > +      * @resv: sync the resv and add job fence to it conditionally.
> > +      */
> > +     struct dma_resv *resv;
> >   };
> >
> >   struct amdgpu_vm_update_funcs {
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c 
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c
> > index 4cc7881f438c..0cfac59bff36 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c
> > @@ -70,6 +70,8 @@ static int amdgpu_vm_sdma_prepare(struct 
> amdgpu_vm_update_params *p,
> >
> >        p->num_dw_left = ndw;
> >
> > +     p->resv = resv;
> > +
> >        if (!resv)
> >                return 0;
> >
> > @@ -111,6 +113,13 @@ static int amdgpu_vm_sdma_commit(struct 
> amdgpu_vm_update_params *p,
> >                swap(p->vm->last_delayed, tmp);
> >        dma_fence_put(tmp);
> >
> > +     /* add job fence to resv.
> > +      * MM notifier path is an exception as we can not grab the
> > +      * resv lock.
> > +      */
> > +     if (!p->direct && p->resv)
> > +             dma_resv_add_shared_fence(p->resv, f);
> > +
> >        if (fence && !p->direct)
> >                swap(*fence, f);
> >        dma_fence_put(f);
>


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Re: [PATCH 1/2] drm//amdgpu: Add job fence to resv conditionally

[Pan, Xinhui]

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Yep, will send v3.

Thanks
xinhui

发件人: "Koenig, Christian" <Christian.Koenig@amd.com>
日期: 2020年3月13日 星期五 21:46
收件人: "Pan, Xinhui" <Xinhui.Pan@amd.com>, "amd-gfx@lists.freedesktop.org" <amd-gfx@lists.freedesktop.org>
抄送: "Deucher, Alexander" <Alexander.Deucher@amd.com>, "Kuehling, Felix" <Felix.Kuehling@amd.com>
主题: Re: [PATCH 1/2] drm//amdgpu: Add job fence to resv conditionally

Yeah, but this is still the wrong resv object :)

See the object passed to amdgpu_vm_sdma_prepare() is the one of the BO which is mapped into the page tables and NOT the one of the page tables.

You need to use p->vm->root.base.bo->tbo.base.resv here.

Regards,
Christian.

Am 13.03.20 um 14:43 schrieb Pan, Xinhui:

[AMD Official Use Only - Internal Distribution Only]

page table BOs share same resv.It should be ok using any of them, root bo resv or bo resv.
I forgot to unref bos which cause problems. not good at rebasing...


________________________________
From: Koenig, Christian <Christian.Koenig@amd.com><mailto:Christian.Koenig@amd.com>
Sent: Friday, March 13, 2020 9:34:42 PM
To: Pan, Xinhui <Xinhui.Pan@amd.com><mailto:Xinhui.Pan@amd.com>; amd-gfx@lists.freedesktop.org<mailto:amd-gfx@lists.freedesktop.org> <amd-gfx@lists.freedesktop.org><mailto:amd-gfx@lists.freedesktop.org>
Cc: Deucher, Alexander <Alexander.Deucher@amd.com><mailto:Alexander.Deucher@amd.com>; Kuehling, Felix <Felix.Kuehling@amd.com><mailto:Felix.Kuehling@amd.com>
Subject: Re: [PATCH 1/2] drm//amdgpu: Add job fence to resv conditionally

Am 13.03.20 um 12:53 schrieb xinhui pan:
> If a job need sync the bo resv, it is likely that bo need the job fence
> to sync with others.

That won't work because this is the wrong resv object :)

You added the fence to the mapped BO and not the page table.

No wonder that this doesn't work,
Christian.

>
> Cc: Christian König <christian.koenig@amd.com><mailto:christian.koenig@amd.com>
> Cc: Alex Deucher <alexander.deucher@amd.com><mailto:alexander.deucher@amd.com>
> Cc: Felix Kuehling <Felix.Kuehling@amd.com><mailto:Felix.Kuehling@amd.com>
> Suggested-by: Christian König <christian.koenig@amd.com><mailto:christian.koenig@amd.com>
> Signed-off-by: xinhui pan <xinhui.pan@amd.com><mailto:xinhui.pan@amd.com>
> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h      | 5 +++++
>   drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c | 9 +++++++++
>   2 files changed, 14 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
> index b5705fcfc935..ca6021b4200b 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
> @@ -226,6 +226,11 @@ struct amdgpu_vm_update_params {
>         * @num_dw_left: number of dw left for the IB
>         */
>        unsigned int num_dw_left;
> +
> +     /**
> +      * @resv: sync the resv and add job fence to it conditionally.
> +      */
> +     struct dma_resv *resv;
>   };
>
>   struct amdgpu_vm_update_funcs {
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c
> index 4cc7881f438c..0cfac59bff36 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_sdma.c
> @@ -70,6 +70,8 @@ static int amdgpu_vm_sdma_prepare(struct amdgpu_vm_update_params *p,
>
>        p->num_dw_left = ndw;
>
> +     p->resv = resv;
> +
>        if (!resv)
>                return 0;
>
> @@ -111,6 +113,13 @@ static int amdgpu_vm_sdma_commit(struct amdgpu_vm_update_params *p,
>                swap(p->vm->last_delayed, tmp);
>        dma_fence_put(tmp);
>
> +     /* add job fence to resv.
> +      * MM notifier path is an exception as we can not grab the
> +      * resv lock.
> +      */
> +     if (!p->direct && p->resv)
> +             dma_resv_add_shared_fence(p->resv, f);
> +
>        if (fence && !p->direct)
>                swap(*fence, f);
>        dma_fence_put(f);



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