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Diffstat (limited to 'linux-core/drm_ttm.c')
-rw-r--r--linux-core/drm_ttm.c139
1 files changed, 99 insertions, 40 deletions
diff --git a/linux-core/drm_ttm.c b/linux-core/drm_ttm.c
index 3540571f..a9d87338 100644
--- a/linux-core/drm_ttm.c
+++ b/linux-core/drm_ttm.c
@@ -46,7 +46,7 @@ EXPORT_SYMBOL(drm_ttm_cache_flush);
* Use kmalloc if possible. Otherwise fall back to vmalloc.
*/
-static void ttm_alloc_pages(struct drm_ttm *ttm)
+static void drm_ttm_alloc_pages(struct drm_ttm *ttm)
{
unsigned long size = ttm->num_pages * sizeof(*ttm->pages);
ttm->pages = NULL;
@@ -66,7 +66,7 @@ static void ttm_alloc_pages(struct drm_ttm *ttm)
drm_free_memctl(size);
}
-static void ttm_free_pages(struct drm_ttm *ttm)
+static void drm_ttm_free_pages(struct drm_ttm *ttm)
{
unsigned long size = ttm->num_pages * sizeof(*ttm->pages);
@@ -103,7 +103,7 @@ static struct page *drm_ttm_alloc_page(void)
* for range of pages in a ttm.
*/
-static int drm_set_caching(struct drm_ttm *ttm, int noncached)
+static int drm_ttm_set_caching(struct drm_ttm *ttm, int noncached)
{
int i;
struct page **cur_page;
@@ -145,7 +145,7 @@ static void drm_ttm_free_user_pages(struct drm_ttm *ttm)
int i;
BUG_ON(!(ttm->page_flags & DRM_TTM_PAGE_USER));
- write = ((ttm->page_flags & DRM_TTM_PAGE_USER_WRITE) != 0);
+ write = ((ttm->page_flags & DRM_TTM_PAGE_WRITE) != 0);
dirty = ((ttm->page_flags & DRM_TTM_PAGE_USER_DIRTY) != 0);
for (i = 0; i < ttm->num_pages; ++i) {
@@ -193,7 +193,7 @@ static void drm_ttm_free_alloced_pages(struct drm_ttm *ttm)
* Free all resources associated with a ttm.
*/
-int drm_destroy_ttm(struct drm_ttm *ttm)
+int drm_ttm_destroy(struct drm_ttm *ttm)
{
struct drm_ttm_backend *be;
@@ -208,14 +208,14 @@ int drm_destroy_ttm(struct drm_ttm *ttm)
if (ttm->pages) {
if (ttm->page_flags & DRM_TTM_PAGE_UNCACHED)
- drm_set_caching(ttm, 0);
+ drm_ttm_set_caching(ttm, 0);
if (ttm->page_flags & DRM_TTM_PAGE_USER)
drm_ttm_free_user_pages(ttm);
else
drm_ttm_free_alloced_pages(ttm);
- ttm_free_pages(ttm);
+ drm_ttm_free_pages(ttm);
}
drm_ctl_free(ttm, sizeof(*ttm), DRM_MEM_TTM);
@@ -239,23 +239,33 @@ struct page *drm_ttm_get_page(struct drm_ttm *ttm, int index)
}
EXPORT_SYMBOL(drm_ttm_get_page);
+/**
+ * drm_ttm_set_user:
+ *
+ * @ttm: the ttm to map pages to. This must always be
+ * a freshly created ttm.
+ *
+ * @tsk: a pointer to the address space from which to map
+ * pages.
+ *
+ * @write: a boolean indicating that write access is desired
+ *
+ * start: the starting address
+ *
+ * Map a range of user addresses to a new ttm object. This
+ * provides access to user memory from the graphics device.
+ */
int drm_ttm_set_user(struct drm_ttm *ttm,
struct task_struct *tsk,
- int write,
unsigned long start,
- unsigned long num_pages,
- struct page *dummy_read_page)
+ unsigned long num_pages)
{
struct mm_struct *mm = tsk->mm;
int ret;
- int i;
+ int write = (ttm->page_flags & DRM_TTM_PAGE_WRITE) != 0;
BUG_ON(num_pages != ttm->num_pages);
-
- ttm->dummy_read_page = dummy_read_page;
- ttm->page_flags |= DRM_TTM_PAGE_USER |
- ((write) ? DRM_TTM_PAGE_USER_WRITE : 0);
-
+ BUG_ON((ttm->page_flags & DRM_TTM_PAGE_USER) == 0);
down_read(&mm->mmap_sem);
ret = get_user_pages(tsk, mm, start, num_pages,
@@ -267,14 +277,17 @@ int drm_ttm_set_user(struct drm_ttm *ttm,
return -ENOMEM;
}
- for (i = 0; i < num_pages; ++i) {
- if (ttm->pages[i] == NULL)
- ttm->pages[i] = ttm->dummy_read_page;
- }
-
return 0;
}
+/**
+ * drm_ttm_populate:
+ *
+ * @ttm: the object to allocate pages for
+ *
+ * Allocate pages for all unset page entries, then
+ * call the backend to create the hardware mappings
+ */
int drm_ttm_populate(struct drm_ttm *ttm)
{
struct page *page;
@@ -285,21 +298,32 @@ int drm_ttm_populate(struct drm_ttm *ttm)
return 0;
be = ttm->be;
- for (i = 0; i < ttm->num_pages; ++i) {
- page = drm_ttm_get_page(ttm, i);
- if (!page)
- return -ENOMEM;
+ if (ttm->page_flags & DRM_TTM_PAGE_WRITE) {
+ for (i = 0; i < ttm->num_pages; ++i) {
+ page = drm_ttm_get_page(ttm, i);
+ if (!page)
+ return -ENOMEM;
+ }
}
- be->func->populate(be, ttm->num_pages, ttm->pages);
+ be->func->populate(be, ttm->num_pages, ttm->pages, ttm->dummy_read_page);
ttm->state = ttm_unbound;
return 0;
}
-/*
- * Initialize a ttm.
+/**
+ * drm_ttm_create:
+ *
+ * @dev: the drm_device
+ *
+ * @size: The size (in bytes) of the desired object
+ *
+ * @page_flags: various DRM_TTM_PAGE_* flags. See drm_object.h.
+ *
+ * Allocate and initialize a ttm, leaving it unpopulated at this time
*/
-struct drm_ttm *drm_ttm_init(struct drm_device *dev, unsigned long size)
+struct drm_ttm *drm_ttm_create(struct drm_device *dev, unsigned long size,
+ uint32_t page_flags, struct page *dummy_read_page)
{
struct drm_bo_driver *bo_driver = dev->driver->bo_driver;
struct drm_ttm *ttm;
@@ -317,21 +341,23 @@ struct drm_ttm *drm_ttm_init(struct drm_device *dev, unsigned long size)
ttm->destroy = 0;
ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
- ttm->page_flags = 0;
+ ttm->page_flags = page_flags;
+
+ ttm->dummy_read_page = dummy_read_page;
/*
* Account also for AGP module memory usage.
*/
- ttm_alloc_pages(ttm);
+ drm_ttm_alloc_pages(ttm);
if (!ttm->pages) {
- drm_destroy_ttm(ttm);
+ drm_ttm_destroy(ttm);
DRM_ERROR("Failed allocating page table\n");
return NULL;
}
ttm->be = bo_driver->create_ttm_backend_entry(dev);
if (!ttm->be) {
- drm_destroy_ttm(ttm);
+ drm_ttm_destroy(ttm);
DRM_ERROR("Failed creating ttm backend entry\n");
return NULL;
}
@@ -339,10 +365,15 @@ struct drm_ttm *drm_ttm_init(struct drm_device *dev, unsigned long size)
return ttm;
}
-/*
- * Unbind a ttm region from the aperture.
+/**
+ * drm_ttm_evict:
+ *
+ * @ttm: the object to be unbound from the aperture.
+ *
+ * Transition a ttm from bound to evicted, where it
+ * isn't present in the aperture, but various caches may
+ * not be consistent.
*/
-
void drm_ttm_evict(struct drm_ttm *ttm)
{
struct drm_ttm_backend *be = ttm->be;
@@ -356,17 +387,33 @@ void drm_ttm_evict(struct drm_ttm *ttm)
ttm->state = ttm_evicted;
}
+/**
+ * drm_ttm_fixup_caching:
+ *
+ * @ttm: the object to set unbound
+ *
+ * XXX this function is misnamed. Transition a ttm from evicted to
+ * unbound, flushing caches as appropriate.
+ */
void drm_ttm_fixup_caching(struct drm_ttm *ttm)
{
if (ttm->state == ttm_evicted) {
struct drm_ttm_backend *be = ttm->be;
if (be->func->needs_ub_cache_adjust(be))
- drm_set_caching(ttm, 0);
+ drm_ttm_set_caching(ttm, 0);
ttm->state = ttm_unbound;
}
}
+/**
+ * drm_ttm_unbind:
+ *
+ * @ttm: the object to unbind from the graphics device
+ *
+ * Unbind an object from the aperture. This removes the mappings
+ * from the graphics device and flushes caches if necessary.
+ */
void drm_ttm_unbind(struct drm_ttm *ttm)
{
if (ttm->state == ttm_bound)
@@ -375,7 +422,19 @@ void drm_ttm_unbind(struct drm_ttm *ttm)
drm_ttm_fixup_caching(ttm);
}
-int drm_bind_ttm(struct drm_ttm *ttm, struct drm_bo_mem_reg *bo_mem)
+/**
+ * drm_ttm_bind:
+ *
+ * @ttm: the ttm object to bind to the graphics device
+ *
+ * @bo_mem: the aperture memory region which will hold the object
+ *
+ * Bind a ttm object to the aperture. This ensures that the necessary
+ * pages are allocated, flushes CPU caches as needed and marks the
+ * ttm as DRM_TTM_PAGE_USER_DIRTY to indicate that it may have been
+ * modified by the GPU
+ */
+int drm_ttm_bind(struct drm_ttm *ttm, struct drm_bo_mem_reg *bo_mem)
{
struct drm_bo_driver *bo_driver = ttm->dev->driver->bo_driver;
int ret = 0;
@@ -393,7 +452,7 @@ int drm_bind_ttm(struct drm_ttm *ttm, struct drm_bo_mem_reg *bo_mem)
return ret;
if (ttm->state == ttm_unbound && !(bo_mem->flags & DRM_BO_FLAG_CACHED))
- drm_set_caching(ttm, DRM_TTM_PAGE_UNCACHED);
+ drm_ttm_set_caching(ttm, DRM_TTM_PAGE_UNCACHED);
else if ((bo_mem->flags & DRM_BO_FLAG_CACHED_MAPPED) &&
bo_driver->ttm_cache_flush)
bo_driver->ttm_cache_flush(ttm);
@@ -410,4 +469,4 @@ int drm_bind_ttm(struct drm_ttm *ttm, struct drm_bo_mem_reg *bo_mem)
ttm->page_flags |= DRM_TTM_PAGE_USER_DIRTY;
return 0;
}
-EXPORT_SYMBOL(drm_bind_ttm);
+EXPORT_SYMBOL(drm_ttm_bind);
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-10 02:01:28 +0000