[PATCH] cleanup: Add 'struct dev' in the TTM layer to be passed in for DMA API calls.
From: Konrad Rzeszutek Wilk
Date: Tue Mar 08 2011 - 10:42:12 EST
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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