[PATCH] cleanup: Add 'struct dev' in the TTM layer to be passed in for DMA API calls.

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These two patches are not strictly required but they do a bit of
cleanup and also fix a false reporting issue when the kernel is compiled
with CONFIG_DEBUG_DMA_API.

Essentially the patchset modifies 'struct ttm_tt' and 'struct ttm_bo_device'
to contain a pointer to 'struct device'. Passing of the 'struct device'
is done via the 'tt_bo_device_init'. The 'struct device' is then used
during the allocation/deallocation of pages when TTM_PAGE_FLAG_DMA32 flag
is set.

At first it seems that we would need to keep a copy of
'struct device' in the struct ttm_bo_device only and use that. However,
when 'ttm_tt_destroy' is called it sets ttm->be (which contains
the 'struct ttm_bo_device') to NULL so we cannot use it. Hence
we copy the 'struct device' pointer to the 'struct ttm_tm' and keep
it there.

I've put the patches on:

git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen.git devel/ttm.pci-api.v5

The testing was a bit difficult b/c I could not persuade the machine to unload
either the nouveau or radeon driver (I had a serial console hooked so I figured
it would fallback to that?). Ended up calling 'unbind' on the
/sys/pci/.../$BDF/driver/[radeon,nouveau] to trigger the de-allocation path.

Thomas,

What is the best way to test vmw-gfx*? Does the Workstation (5?) support
this particular frontend? 

Konrad Rzeszutek Wilk (2):
      ttm: Include the 'struct dev' when using the DMA API.
      ttm: Pass in 'struct device' to TTM so it can do DMA API on behalf of device.

 drivers/gpu/drm/nouveau/nouveau_mem.c |    3 ++-
 drivers/gpu/drm/radeon/radeon_ttm.c   |    3 ++-
 drivers/gpu/drm/ttm/ttm_bo.c          |    4 +++-
 drivers/gpu/drm/ttm/ttm_page_alloc.c  |   11 ++++++-----
 drivers/gpu/drm/ttm/ttm_tt.c          |    5 +++--
 drivers/gpu/drm/vmwgfx/vmwgfx_drv.c   |    4 ++--
 include/drm/ttm/ttm_bo_driver.h       |    7 ++++++-
 include/drm/ttm/ttm_page_alloc.h      |    8 ++++++--
 8 files changed, 30 insertions(+), 15 deletions(-)


The full diff:

diff --git a/drivers/gpu/drm/nouveau/nouveau_mem.c b/drivers/gpu/drm/nouveau/nouveau_mem.c
index 26347b7..3706156 100644
--- a/drivers/gpu/drm/nouveau/nouveau_mem.c
+++ b/drivers/gpu/drm/nouveau/nouveau_mem.c
@@ -412,7 +412,8 @@ nouveau_mem_vram_init(struct drm_device *dev)
 	ret = ttm_bo_device_init(&dev_priv->ttm.bdev,
 				 dev_priv->ttm.bo_global_ref.ref.object,
 				 &nouveau_bo_driver, DRM_FILE_PAGE_OFFSET,
-				 dma_bits <= 32 ? true : false);
+				 dma_bits <= 32 ? true : false,
+				 dev->dev);
 	if (ret) {
 		NV_ERROR(dev, "Error initialising bo driver: %d\n", ret);
 		return ret;
diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c
index 9ead11f..371890c 100644
--- a/drivers/gpu/drm/radeon/radeon_ttm.c
+++ b/drivers/gpu/drm/radeon/radeon_ttm.c
@@ -517,7 +517,8 @@ int radeon_ttm_init(struct radeon_device *rdev)
 	r = ttm_bo_device_init(&rdev->mman.bdev,
 			       rdev->mman.bo_global_ref.ref.object,
 			       &radeon_bo_driver, DRM_FILE_PAGE_OFFSET,
-			       rdev->need_dma32);
+			       rdev->need_dma32,
+			       rdev->dev);
 	if (r) {
 		DRM_ERROR("failed initializing buffer object driver(%d).\n", r);
 		return r;
diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index af61fc2..278a2d3 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -1526,12 +1526,14 @@ int ttm_bo_device_init(struct ttm_bo_device *bdev,
 		       struct ttm_bo_global *glob,
 		       struct ttm_bo_driver *driver,
 		       uint64_t file_page_offset,
-		       bool need_dma32)
+		       bool need_dma32,
+		       struct device *dev)
 {
 	int ret = -EINVAL;
 
 	rwlock_init(&bdev->vm_lock);
 	bdev->driver = driver;
+	bdev->dev = dev;
 
 	memset(bdev->man, 0, sizeof(bdev->man));
 
diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc.c b/drivers/gpu/drm/ttm/ttm_page_alloc.c
index 737a2a2..35849db 100644
--- a/drivers/gpu/drm/ttm/ttm_page_alloc.c
+++ b/drivers/gpu/drm/ttm/ttm_page_alloc.c
@@ -664,7 +664,7 @@ out:
  */
 int ttm_get_pages(struct list_head *pages, int flags,
 		  enum ttm_caching_state cstate, unsigned count,
-		  dma_addr_t *dma_address)
+		  dma_addr_t *dma_address, struct device *dev)
 {
 	struct ttm_page_pool *pool = ttm_get_pool(flags, cstate);
 	struct page *p = NULL;
@@ -685,7 +685,7 @@ int ttm_get_pages(struct list_head *pages, int flags,
 		for (r = 0; r < count; ++r) {
 			if ((flags & TTM_PAGE_FLAG_DMA32) && dma_address) {
 				void *addr;
-				addr = dma_alloc_coherent(NULL, PAGE_SIZE,
+				addr = dma_alloc_coherent(dev, PAGE_SIZE,
 							  &dma_address[r],
 							  gfp_flags);
 				if (addr == NULL)
@@ -730,7 +730,7 @@ int ttm_get_pages(struct list_head *pages, int flags,
 			printk(KERN_ERR TTM_PFX
 			       "Failed to allocate extra pages "
 			       "for large request.");
-			ttm_put_pages(pages, 0, flags, cstate, NULL);
+			ttm_put_pages(pages, 0, flags, cstate, NULL, NULL);
 			return r;
 		}
 	}
@@ -741,7 +741,8 @@ int ttm_get_pages(struct list_head *pages, int flags,
 
 /* Put all pages in pages list to correct pool to wait for reuse */
 void ttm_put_pages(struct list_head *pages, unsigned page_count, int flags,
-		   enum ttm_caching_state cstate, dma_addr_t *dma_address)
+		   enum ttm_caching_state cstate, dma_addr_t *dma_address,
+		   struct device *dev)
 {
 	unsigned long irq_flags;
 	struct ttm_page_pool *pool = ttm_get_pool(flags, cstate);
@@ -757,7 +758,7 @@ void ttm_put_pages(struct list_head *pages, unsigned page_count, int flags,
 				void *addr = page_address(p);
 				WARN_ON(!addr || !dma_address[r]);
 				if (addr)
-					dma_free_coherent(NULL, PAGE_SIZE,
+					dma_free_coherent(dev, PAGE_SIZE,
 							  addr,
 							  dma_address[r]);
 				dma_address[r] = 0;
diff --git a/drivers/gpu/drm/ttm/ttm_tt.c b/drivers/gpu/drm/ttm/ttm_tt.c
index 86d5b17..354f9d9 100644
--- a/drivers/gpu/drm/ttm/ttm_tt.c
+++ b/drivers/gpu/drm/ttm/ttm_tt.c
@@ -110,7 +110,7 @@ static struct page *__ttm_tt_get_page(struct ttm_tt *ttm, int index)
 		INIT_LIST_HEAD(&h);
 
 		ret = ttm_get_pages(&h, ttm->page_flags, ttm->caching_state, 1,
-				    &ttm->dma_address[index]);
+				    &ttm->dma_address[index], ttm->dev);
 
 		if (ret != 0)
 			return NULL;
@@ -304,7 +304,7 @@ static void ttm_tt_free_alloced_pages(struct ttm_tt *ttm)
 		}
 	}
 	ttm_put_pages(&h, count, ttm->page_flags, ttm->caching_state,
-		      ttm->dma_address);
+		      ttm->dma_address, ttm->dev);
 	ttm->state = tt_unpopulated;
 	ttm->first_himem_page = ttm->num_pages;
 	ttm->last_lomem_page = -1;
@@ -397,6 +397,7 @@ struct ttm_tt *ttm_tt_create(struct ttm_bo_device *bdev, unsigned long size,
 	ttm->last_lomem_page = -1;
 	ttm->caching_state = tt_cached;
 	ttm->page_flags = page_flags;
+	ttm->dev = bdev->dev;
 
 	ttm->dummy_read_page = dummy_read_page;
 
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
index 10ca97e..803d979 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
@@ -322,11 +322,11 @@ static int vmw_driver_load(struct drm_device *dev, unsigned long chipset)
 	ttm_lock_set_kill(&dev_priv->fbdev_master.lock, false, SIGTERM);
 	dev_priv->active_master = &dev_priv->fbdev_master;
 
-
 	ret = ttm_bo_device_init(&dev_priv->bdev,
 				 dev_priv->bo_global_ref.ref.object,
 				 &vmw_bo_driver, VMWGFX_FILE_PAGE_OFFSET,
-				 false);
+				 false,
+				 dev->dev);
 	if (unlikely(ret != 0)) {
 		DRM_ERROR("Failed initializing TTM buffer object driver.\n");
 		goto out_err1;
diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h
index efed082..2024a74 100644
--- a/include/drm/ttm/ttm_bo_driver.h
+++ b/include/drm/ttm/ttm_bo_driver.h
@@ -177,6 +177,7 @@ struct ttm_tt {
 		tt_unpopulated,
 	} state;
 	dma_addr_t *dma_address;
+	struct device *dev;
 };
 
 #define TTM_MEMTYPE_FLAG_FIXED         (1 << 0)	/* Fixed (on-card) PCI memory */
@@ -551,6 +552,7 @@ struct ttm_bo_device {
 	struct list_head device_list;
 	struct ttm_bo_global *glob;
 	struct ttm_bo_driver *driver;
+	struct device *dev;
 	rwlock_t vm_lock;
 	struct ttm_mem_type_manager man[TTM_NUM_MEM_TYPES];
 	spinlock_t fence_lock;
@@ -791,6 +793,8 @@ extern int ttm_bo_device_release(struct ttm_bo_device *bdev);
  * @file_page_offset: Offset into the device address space that is available
  * for buffer data. This ensures compatibility with other users of the
  * address space.
+ * @need_dma32: Allocate pages under 4GB
+ * @dev: 'struct device' of the PCI device.
  *
  * Initializes a struct ttm_bo_device:
  * Returns:
@@ -799,7 +803,8 @@ extern int ttm_bo_device_release(struct ttm_bo_device *bdev);
 extern int ttm_bo_device_init(struct ttm_bo_device *bdev,
 			      struct ttm_bo_global *glob,
 			      struct ttm_bo_driver *driver,
-			      uint64_t file_page_offset, bool need_dma32);
+			      uint64_t file_page_offset, bool need_dma32,
+			      struct device *dev);
 
 /**
  * ttm_bo_unmap_virtual
diff --git a/include/drm/ttm/ttm_page_alloc.h b/include/drm/ttm/ttm_page_alloc.h
index 8062890..ccb6b7a 100644
--- a/include/drm/ttm/ttm_page_alloc.h
+++ b/include/drm/ttm/ttm_page_alloc.h
@@ -37,12 +37,14 @@
  * @cstate: ttm caching state for the page.
  * @count: number of pages to allocate.
  * @dma_address: The DMA (bus) address of pages (if TTM_PAGE_FLAG_DMA32 set).
+ * @dev: struct device for appropiate DMA accounting.
  */
 int ttm_get_pages(struct list_head *pages,
 		  int flags,
 		  enum ttm_caching_state cstate,
 		  unsigned count,
-		  dma_addr_t *dma_address);
+		  dma_addr_t *dma_address,
+		  struct device *dev);
 /**
  * Put linked list of pages to pool.
  *
@@ -52,12 +54,14 @@ int ttm_get_pages(struct list_head *pages,
  * @flags: ttm flags for page allocation.
  * @cstate: ttm caching state.
  * @dma_address: The DMA (bus) address of pages (if TTM_PAGE_FLAG_DMA32 set).
+ * @dev: struct device for appropiate DMA accounting.
  */
 void ttm_put_pages(struct list_head *pages,
 		   unsigned page_count,
 		   int flags,
 		   enum ttm_caching_state cstate,
-		   dma_addr_t *dma_address);
+		   dma_addr_t *dma_address,
+		   struct device *dev);
 /**
  * Initialize pool allocator.
  */
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