Bring in stripped TTM functionality.

1 files changed, 152 insertions, 0 deletions

diff --git a/linux-core/drm_ttm.h b/linux-core/drm_ttm.h
new file mode 100644
index 00000000..07592a84
--- /dev/null
+++ b/linux-core/drm_ttm.h
@@ -0,0 +1,152 @@
+#ifndef _DRM_TTM_H
+#define _DRM_TTM_H
+#define DRM_HAS_TTM
+
+/*
+ * The backend GART interface. (In our case AGP). Any similar type of device (PCIE?)
+ * needs only to implement these functions to be usable with the "TTM" interface.
+ * The AGP backend implementation lives in drm_agpsupport.c 
+ * basically maps these calls to available functions in agpgart. Each drm device driver gets an
+ * additional function pointer that creates these types, 
+ * so that the device can choose the correct aperture.
+ * (Multiple AGP apertures, etc.) 
+ * Most device drivers will let this point to the standard AGP implementation.
+ */
+
+typedef struct drm_ttm_backend {
+	unsigned long aperture_base;
+	void *private;
+	int (*needs_cache_adjust) (struct drm_ttm_backend * backend);
+	int (*populate) (struct drm_ttm_backend * backend,
+			 unsigned long num_pages, struct page ** pages);
+	void (*clear) (struct drm_ttm_backend * backend);
+	int (*bind) (struct drm_ttm_backend * backend, unsigned long offset);
+	int (*unbind) (struct drm_ttm_backend * backend);
+	void (*destroy) (struct drm_ttm_backend * backend);
+} drm_ttm_backend_t;
+
+#define DRM_FLUSH_READ  (0x01)
+#define DRM_FLUSH_WRITE (0x02)
+#define DRM_FLUSH_EXE   (0x04)
+
+typedef struct drm_ttm_backend_list {
+        drm_hash_item_t hash;
+	uint32_t flags;
+	atomic_t refcount;
+	struct list_head head;
+	drm_ttm_backend_t *be;
+	unsigned page_offset;
+	unsigned num_pages;
+	struct drm_ttm *owner;
+	drm_file_t *anon_owner;
+	struct page **anon_pages;
+	int anon_locked;
+	enum {
+		ttm_bound,
+		ttm_evicted,
+		ttm_unbound
+	} state;
+} drm_ttm_backend_list_t;
+
+typedef struct drm_ttm_vma_list {
+	struct list_head head;
+	pgprot_t orig_protection;
+	struct vm_area_struct *vma;
+	drm_map_t *map;
+} drm_ttm_vma_list_t;
+
+typedef struct drm_ttm {
+	struct list_head p_mm_list;
+	atomic_t shared_count;
+	uint32_t mm_list_seq;
+	unsigned long aperture_base;
+	struct page **pages;
+	uint32_t *page_flags;
+	unsigned long lhandle;
+	unsigned long num_pages;
+	drm_ttm_vma_list_t *vma_list;
+	struct drm_device *dev;
+	drm_ttm_backend_list_t *be_list;
+	atomic_t vma_count;
+	atomic_t unfinished_regions;
+	drm_file_t *owner;
+	int destroy;
+	int mmap_sem_locked;
+} drm_ttm_t;
+
+/*
+ * Initialize a ttm. Currently the size is fixed. Currently drmAddMap calls this function
+ * and creates a DRM map of type _DRM_TTM, and returns a reference to that map to the 
+ * caller.
+ */
+
+drm_ttm_t *drm_init_ttm(struct drm_device *dev, unsigned long size);
+
+/*
+ * Bind a part of the ttm starting at page_offset size n_pages into the GTT, at
+ * aperture offset aper_offset. The region handle will be used to reference this
+ * bound region in the future. Note that the region may be the whole ttm. 
+ * Regions should not overlap.
+ * This function sets all affected pages as noncacheable and flushes cashes and TLB.
+ */
+
+int drm_create_ttm_region(drm_ttm_t * ttm, unsigned long page_offset,
+			  unsigned long n_pages, int cached,
+			  drm_ttm_backend_list_t ** region);
+
+int drm_bind_ttm_region(drm_ttm_backend_list_t * region,
+			unsigned long aper_offset);
+
+/*
+ * Unbind a ttm region. Restores caching policy. Flushes caches and TLB.
+ */
+
+void drm_unbind_ttm_region(drm_ttm_backend_list_t * entry);
+void drm_destroy_ttm_region(drm_ttm_backend_list_t * entry);
+
+/*
+ * Evict a ttm region. Keeps Aperture caching policy.
+ */
+
+int drm_evict_ttm_region(drm_ttm_backend_list_t * entry);
+
+/*
+ * Rebind an already evicted region into a possibly new location in the aperture.
+ */
+
+int drm_rebind_ttm_region(drm_ttm_backend_list_t * entry,
+			  unsigned long aper_offset);
+
+/*
+ * Destroy a ttm. The user normally calls drmRmMap or a similar IOCTL to do this, 
+ * which calls this function iff there are no vmas referencing it anymore. Otherwise it is called
+ * when the last vma exits.
+ */
+
+extern int drm_destroy_ttm(drm_ttm_t * ttm);
+extern void drm_user_destroy_region(drm_ttm_backend_list_t * entry);
+extern int drm_ttm_add_mm_to_list(drm_ttm_t * ttm, struct mm_struct *mm);
+extern void drm_ttm_delete_mm(drm_ttm_t * ttm, struct mm_struct *mm);
+extern void drm_ttm_fence_before_destroy(drm_ttm_t * ttm);
+extern void drm_fence_unfenced_region(drm_ttm_backend_list_t * entry);
+
+extern int drm_ttm_ioctl(DRM_IOCTL_ARGS);
+extern int drm_mm_init_ioctl(DRM_IOCTL_ARGS);
+extern int drm_mm_fence_ioctl(DRM_IOCTL_ARGS);
+
+#define DRM_MASK_VAL(dest, mask, val)			\
+  (dest) = ((dest) & ~(mask)) | ((val) & (mask));
+
+#define DRM_TTM_MASK_FLAGS ((1 << PAGE_SHIFT) - 1)
+#define DRM_TTM_MASK_PFN (0xFFFFFFFFU - DRM_TTM_MASK_FLAGS)
+
+/*
+ * Page flags.
+ */
+
+#define DRM_TTM_PAGE_UNCACHED 0x01
+#define DRM_TTM_PAGE_USED     0x02
+#define DRM_TTM_PAGE_BOUND    0x04
+#define DRM_TTM_PAGE_PRESENT  0x08
+
+#endif