[PATCH 13/25] drm/ttm: Add BO and offset arguments for vm_access and vm_fault ttm handlers.
Matthew Auld
matthew.auld at intel.com
Tue May 18 13:43:25 UTC 2021
From: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
This allows other drivers that may not setup the vma in the same way
to use the ttm bo helpers.
Also clarify the documentation a bit, especially related to VM_FAULT_RETRY.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 4 +-
drivers/gpu/drm/nouveau/nouveau_ttm.c | 4 +-
drivers/gpu/drm/radeon/radeon_ttm.c | 4 +-
drivers/gpu/drm/ttm/ttm_bo_vm.c | 84 +++++++++++++---------
drivers/gpu/drm/vmwgfx/vmwgfx_page_dirty.c | 8 ++-
include/drm/ttm/ttm_bo_api.h | 9 ++-
6 files changed, 75 insertions(+), 38 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index d5a9d7a88315..89dafe14f828 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -1919,7 +1919,9 @@ static vm_fault_t amdgpu_ttm_fault(struct vm_fault *vmf)
if (ret)
goto unlock;
- ret = ttm_bo_vm_fault_reserved(vmf, vmf->vma->vm_page_prot,
+ ret = ttm_bo_vm_fault_reserved(bo, vmf,
+ drm_vma_node_start(&bo->base.vma_node),
+ vmf->vma->vm_page_prot,
TTM_BO_VM_NUM_PREFAULT, 1);
if (ret == VM_FAULT_RETRY && !(vmf->flags & FAULT_FLAG_RETRY_NOWAIT))
return ret;
diff --git a/drivers/gpu/drm/nouveau/nouveau_ttm.c b/drivers/gpu/drm/nouveau/nouveau_ttm.c
index 468eacb41f05..7d99cea739ec 100644
--- a/drivers/gpu/drm/nouveau/nouveau_ttm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_ttm.c
@@ -142,7 +142,9 @@ static vm_fault_t nouveau_ttm_fault(struct vm_fault *vmf)
nouveau_bo_del_io_reserve_lru(bo);
prot = vm_get_page_prot(vma->vm_flags);
- ret = ttm_bo_vm_fault_reserved(vmf, prot, TTM_BO_VM_NUM_PREFAULT, 1);
+ ret = ttm_bo_vm_fault_reserved(bo, vmf,
+ drm_vma_node_start(&bo->base.vma_node),
+ prot, TTM_BO_VM_NUM_PREFAULT, 1);
nouveau_bo_add_io_reserve_lru(bo);
if (ret == VM_FAULT_RETRY && !(vmf->flags & FAULT_FLAG_RETRY_NOWAIT))
return ret;
diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c
index 3361d11769a2..ba48a2acdef0 100644
--- a/drivers/gpu/drm/radeon/radeon_ttm.c
+++ b/drivers/gpu/drm/radeon/radeon_ttm.c
@@ -816,7 +816,9 @@ static vm_fault_t radeon_ttm_fault(struct vm_fault *vmf)
if (ret)
goto unlock_resv;
- ret = ttm_bo_vm_fault_reserved(vmf, vmf->vma->vm_page_prot,
+ ret = ttm_bo_vm_fault_reserved(bo, vmf,
+ drm_vma_node_start(&bo->base.vma_node),
+ vmf->vma->vm_page_prot,
TTM_BO_VM_NUM_PREFAULT, 1);
if (ret == VM_FAULT_RETRY && !(vmf->flags & FAULT_FLAG_RETRY_NOWAIT))
goto unlock_mclk;
diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c b/drivers/gpu/drm/ttm/ttm_bo_vm.c
index b31b18058965..ed00ccf1376e 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_vm.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c
@@ -42,7 +42,7 @@
#include <linux/mem_encrypt.h>
static vm_fault_t ttm_bo_vm_fault_idle(struct ttm_buffer_object *bo,
- struct vm_fault *vmf)
+ struct vm_fault *vmf)
{
vm_fault_t ret = 0;
int err = 0;
@@ -122,7 +122,8 @@ static unsigned long ttm_bo_io_mem_pfn(struct ttm_buffer_object *bo,
* Return:
* 0 on success and the bo was reserved.
* VM_FAULT_RETRY if blocking wait.
- * VM_FAULT_NOPAGE if blocking wait and retrying was not allowed.
+ * VM_FAULT_NOPAGE if blocking wait and retrying was not allowed, or wait interrupted.
+ * VM_FAULT_SIGBUS if wait on bo->moving failed for reason other than a signal.
*/
vm_fault_t ttm_bo_vm_reserve(struct ttm_buffer_object *bo,
struct vm_fault *vmf)
@@ -254,7 +255,9 @@ static vm_fault_t ttm_bo_vm_insert_huge(struct vm_fault *vmf,
/**
* ttm_bo_vm_fault_reserved - TTM fault helper
+ * @bo: The buffer object
* @vmf: The struct vm_fault given as argument to the fault callback
+ * @mmap_base: The base of the mmap, to which the @vmf fault is relative to.
* @prot: The page protection to be used for this memory area.
* @num_prefault: Maximum number of prefault pages. The caller may want to
* specify this based on madvice settings and the size of the GPU object
@@ -265,19 +268,28 @@ static vm_fault_t ttm_bo_vm_insert_huge(struct vm_fault *vmf,
* memory backing the buffer object, and then returns a return code
* instructing the caller to retry the page access.
*
+ * This function ensures any pipelined wait is finished.
+ *
+ * WARNING:
+ * On VM_FAULT_RETRY, the bo will be unlocked by this function when
+ * #FAULT_FLAG_RETRY_NOWAIT is not set inside @vmf->flags. In this
+ * case, the caller should not unlock the @bo.
+ *
* Return:
- * VM_FAULT_NOPAGE on success or pending signal
+ * 0 on success.
+ * VM_FAULT_NOPAGE on pending signal
* VM_FAULT_SIGBUS on unspecified error
* VM_FAULT_OOM on out-of-memory
- * VM_FAULT_RETRY if retryable wait
+ * VM_FAULT_RETRY if retryable wait, see WARNING above.
*/
-vm_fault_t ttm_bo_vm_fault_reserved(struct vm_fault *vmf,
+vm_fault_t ttm_bo_vm_fault_reserved(struct ttm_buffer_object *bo,
+ struct vm_fault *vmf,
+ unsigned long mmap_base,
pgprot_t prot,
pgoff_t num_prefault,
pgoff_t fault_page_size)
{
struct vm_area_struct *vma = vmf->vma;
- struct ttm_buffer_object *bo = vma->vm_private_data;
struct ttm_device *bdev = bo->bdev;
unsigned long page_offset;
unsigned long page_last;
@@ -286,15 +298,11 @@ vm_fault_t ttm_bo_vm_fault_reserved(struct vm_fault *vmf,
struct page *page;
int err;
pgoff_t i;
- vm_fault_t ret = VM_FAULT_NOPAGE;
+ vm_fault_t ret;
unsigned long address = vmf->address;
- /*
- * Wait for buffer data in transit, due to a pipelined
- * move.
- */
ret = ttm_bo_vm_fault_idle(bo, vmf);
- if (unlikely(ret != 0))
+ if (ret)
return ret;
err = ttm_mem_io_reserve(bdev, &bo->mem);
@@ -302,9 +310,8 @@ vm_fault_t ttm_bo_vm_fault_reserved(struct vm_fault *vmf,
return VM_FAULT_SIGBUS;
page_offset = ((address - vma->vm_start) >> PAGE_SHIFT) +
- vma->vm_pgoff - drm_vma_node_start(&bo->base.vma_node);
- page_last = vma_pages(vma) + vma->vm_pgoff -
- drm_vma_node_start(&bo->base.vma_node);
+ vma->vm_pgoff - mmap_base;
+ page_last = vma_pages(vma) + vma->vm_pgoff - mmap_base;
if (unlikely(page_offset >= bo->mem.num_pages))
return VM_FAULT_SIGBUS;
@@ -344,8 +351,7 @@ vm_fault_t ttm_bo_vm_fault_reserved(struct vm_fault *vmf,
} else if (unlikely(!page)) {
break;
}
- page->index = drm_vma_node_start(&bo->base.vma_node) +
- page_offset;
+ page->index = mmap_base + page_offset;
pfn = page_to_pfn(page);
}
@@ -392,7 +398,10 @@ vm_fault_t ttm_bo_vm_fault(struct vm_fault *vmf)
return ret;
prot = vma->vm_page_prot;
- ret = ttm_bo_vm_fault_reserved(vmf, prot, TTM_BO_VM_NUM_PREFAULT, 1);
+ ret = ttm_bo_vm_fault_reserved(bo, vmf,
+ drm_vma_node_start(&bo->base.vma_node),
+ prot, TTM_BO_VM_NUM_PREFAULT, 1);
+
if (ret == VM_FAULT_RETRY && !(vmf->flags & FAULT_FLAG_RETRY_NOWAIT))
return ret;
@@ -460,22 +469,16 @@ static int ttm_bo_vm_access_kmap(struct ttm_buffer_object *bo,
return len;
}
-int ttm_bo_vm_access(struct vm_area_struct *vma, unsigned long addr,
- void *buf, int len, int write)
+int ttm_bo_vm_access_reserved(struct ttm_buffer_object *bo,
+ struct vm_area_struct *vma,
+ unsigned long offset,
+ void *buf, int len, int write)
{
- struct ttm_buffer_object *bo = vma->vm_private_data;
- unsigned long offset = (addr) - vma->vm_start +
- ((vma->vm_pgoff - drm_vma_node_start(&bo->base.vma_node))
- << PAGE_SHIFT);
int ret;
if (len < 1 || (offset + len) >> PAGE_SHIFT > bo->mem.num_pages)
return -EIO;
- ret = ttm_bo_reserve(bo, true, false, NULL);
- if (ret)
- return ret;
-
switch (bo->mem.mem_type) {
case TTM_PL_SYSTEM:
if (unlikely(bo->ttm->page_flags & TTM_PAGE_FLAG_SWAPPED)) {
@@ -485,16 +488,33 @@ int ttm_bo_vm_access(struct vm_area_struct *vma, unsigned long addr,
}
fallthrough;
case TTM_PL_TT:
- ret = ttm_bo_vm_access_kmap(bo, offset, buf, len, write);
- break;
+ return ttm_bo_vm_access_kmap(bo, offset, buf, len, write);
default:
if (bo->bdev->funcs->access_memory)
- ret = bo->bdev->funcs->access_memory(
+ return bo->bdev->funcs->access_memory(
bo, offset, buf, len, write);
else
- ret = -EIO;
+ return -EIO;
}
+ return ret;
+}
+EXPORT_SYMBOL(ttm_bo_vm_access_reserved);
+
+int ttm_bo_vm_access(struct vm_area_struct *vma, unsigned long addr,
+ void *buf, int len, int write)
+{
+ struct ttm_buffer_object *bo = vma->vm_private_data;
+ unsigned long offset = (addr) - vma->vm_start +
+ ((vma->vm_pgoff - drm_vma_node_start(&bo->base.vma_node))
+ << PAGE_SHIFT);
+ int ret;
+
+ ret = ttm_bo_reserve(bo, true, false, NULL);
+ if (ret)
+ return ret;
+
+ ret = ttm_bo_vm_access_reserved(bo, vma, offset, buf, len, write);
ttm_bo_unreserve(bo);
return ret;
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_page_dirty.c b/drivers/gpu/drm/vmwgfx/vmwgfx_page_dirty.c
index 45c9c6a7f1d6..56ecace0cf5c 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_page_dirty.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_page_dirty.c
@@ -477,7 +477,9 @@ vm_fault_t vmw_bo_vm_fault(struct vm_fault *vmf)
else
prot = vm_get_page_prot(vma->vm_flags);
- ret = ttm_bo_vm_fault_reserved(vmf, prot, num_prefault, 1);
+ ret = ttm_bo_vm_fault_reserved(bo, vmf,
+ drm_vma_node_start(&bo->base.vma_node),
+ prot, num_prefault, 1);
if (ret == VM_FAULT_RETRY && !(vmf->flags & FAULT_FLAG_RETRY_NOWAIT))
return ret;
@@ -546,7 +548,9 @@ vm_fault_t vmw_bo_vm_huge_fault(struct vm_fault *vmf,
prot = vm_get_page_prot(vma->vm_flags);
}
- ret = ttm_bo_vm_fault_reserved(vmf, prot, 1, fault_page_size);
+ ret = ttm_bo_vm_fault_reserved(bo, vmf,
+ drm_vma_node_start(&bo->base.vma_node),
+ prot, 1, fault_page_size);
if (ret == VM_FAULT_RETRY && !(vmf->flags & FAULT_FLAG_RETRY_NOWAIT))
return ret;
diff --git a/include/drm/ttm/ttm_bo_api.h b/include/drm/ttm/ttm_bo_api.h
index 639521880c29..434f91f1fdbf 100644
--- a/include/drm/ttm/ttm_bo_api.h
+++ b/include/drm/ttm/ttm_bo_api.h
@@ -605,7 +605,9 @@ int ttm_mem_evict_first(struct ttm_device *bdev,
vm_fault_t ttm_bo_vm_reserve(struct ttm_buffer_object *bo,
struct vm_fault *vmf);
-vm_fault_t ttm_bo_vm_fault_reserved(struct vm_fault *vmf,
+vm_fault_t ttm_bo_vm_fault_reserved(struct ttm_buffer_object *bo,
+ struct vm_fault *vmf,
+ unsigned long mmap_base,
pgprot_t prot,
pgoff_t num_prefault,
pgoff_t fault_page_size);
@@ -616,6 +618,11 @@ void ttm_bo_vm_open(struct vm_area_struct *vma);
void ttm_bo_vm_close(struct vm_area_struct *vma);
+int ttm_bo_vm_access_reserved(struct ttm_buffer_object *bo,
+ struct vm_area_struct *vma,
+ unsigned long offset,
+ void *buf, int len, int write);
+
int ttm_bo_vm_access(struct vm_area_struct *vma, unsigned long addr,
void *buf, int len, int write);
bool ttm_bo_delayed_delete(struct ttm_device *bdev, bool remove_all);
--
2.26.3
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