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-rw-r--r--linux-core/drm_ttm.c519
1 files changed, 519 insertions, 0 deletions
diff --git a/linux-core/drm_ttm.c b/linux-core/drm_ttm.c
new file mode 100644
index 00000000..931972af
--- /dev/null
+++ b/linux-core/drm_ttm.c
@@ -0,0 +1,519 @@
+/**************************************************************************
+ *
+ * Copyright 2006 Tungsten Graphics, Inc., Bismarck, ND., USA
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ *
+ **************************************************************************/
+
+#include "drmP.h"
+
+static void drm_ttm_ipi_handler(void *null)
+{
+ flush_agp_cache();
+}
+
+static void drm_ttm_cache_flush(void)
+{
+ if (on_each_cpu(drm_ttm_ipi_handler, NULL, 1, 1) != 0)
+ DRM_ERROR("Timed out waiting for drm cache flush.\n");
+}
+
+
+/*
+ * Use kmalloc if possible. Otherwise fall back to vmalloc.
+ */
+
+static void *ttm_alloc(unsigned long size, int type)
+{
+ void *ret = NULL;
+
+ if (drm_alloc_memctl(size))
+ return NULL;
+ if (size <= PAGE_SIZE) {
+ ret = drm_alloc(size, type);
+ }
+ if (!ret) {
+ ret = vmalloc(size);
+ }
+ if (!ret) {
+ drm_free_memctl(size);
+ }
+ return ret;
+}
+
+static void ttm_free(void *pointer, unsigned long size, int type)
+{
+
+ if ((unsigned long)pointer >= VMALLOC_START &&
+ (unsigned long)pointer <= VMALLOC_END) {
+ vfree(pointer);
+ } else {
+ drm_free(pointer, size, type);
+ }
+ drm_free_memctl(size);
+}
+
+/*
+ * Unmap all vma pages from vmas mapping this ttm.
+ */
+
+static int unmap_vma_pages(drm_ttm_t * ttm)
+{
+ drm_device_t *dev = ttm->dev;
+ loff_t offset = ((loff_t) ttm->mapping_offset) << PAGE_SHIFT;
+ loff_t holelen = ((loff_t) ttm->num_pages) << PAGE_SHIFT;
+
+#ifdef DRM_ODD_MM_COMPAT
+ int ret;
+ ret = drm_ttm_lock_mm(ttm);
+ if (ret)
+ return ret;
+#endif
+ unmap_mapping_range(dev->dev_mapping, offset, holelen, 1);
+#ifdef DRM_ODD_MM_COMPAT
+ drm_ttm_finish_unmap(ttm);
+#endif
+ return 0;
+}
+
+/*
+ * Change caching policy for the linear kernel map
+ * for range of pages in a ttm.
+ */
+
+static int drm_set_caching(drm_ttm_t * ttm, int noncached)
+{
+ int i;
+ struct page **cur_page;
+ int do_tlbflush = 0;
+
+ if ((ttm->page_flags & DRM_TTM_PAGE_UNCACHED) == noncached)
+ return 0;
+
+ if (noncached)
+ drm_ttm_cache_flush();
+
+ for (i = 0; i < ttm->num_pages; ++i) {
+ cur_page = ttm->pages + i;
+ if (*cur_page) {
+ if (!PageHighMem(*cur_page)) {
+ if (noncached) {
+ map_page_into_agp(*cur_page);
+ } else {
+ unmap_page_from_agp(*cur_page);
+ }
+ do_tlbflush = 1;
+ }
+ }
+ }
+ if (do_tlbflush)
+ flush_agp_mappings();
+
+ DRM_MASK_VAL(ttm->page_flags, DRM_TTM_PAGE_UNCACHED, noncached);
+
+ return 0;
+}
+
+/*
+ * Free all resources associated with a ttm.
+ */
+
+int drm_destroy_ttm(drm_ttm_t * ttm)
+{
+
+ int i;
+ struct page **cur_page;
+ drm_ttm_backend_t *be;
+
+ if (!ttm)
+ return 0;
+
+ if (atomic_read(&ttm->vma_count) > 0) {
+ ttm->destroy = 1;
+ DRM_ERROR("VMAs are still alive. Skipping destruction.\n");
+ return -EBUSY;
+ }
+
+ DRM_DEBUG("Destroying a ttm\n");
+
+#ifdef DRM_TTM_ODD_COMPAT
+ BUG_ON(!list_empty(&ttm->vma_list));
+ BUG_ON(!list_empty(&ttm->p_mm_list));
+#endif
+ be = ttm->be;
+ if (be) {
+ be->destroy(be);
+ ttm->be = NULL;
+ }
+
+ if (ttm->pages) {
+ drm_buffer_manager_t *bm = &ttm->dev->bm;
+ if (ttm->page_flags & DRM_TTM_PAGE_UNCACHED)
+ drm_set_caching(ttm, 0);
+
+ for (i = 0; i < ttm->num_pages; ++i) {
+ cur_page = ttm->pages + i;
+ if (*cur_page) {
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,15))
+ unlock_page(*cur_page);
+#else
+ ClearPageReserved(*cur_page);
+#endif
+ if (page_count(*cur_page) != 1) {
+ DRM_ERROR("Erroneous page count. "
+ "Leaking pages.\n");
+ }
+ if (page_mapped(*cur_page)) {
+ DRM_ERROR("Erroneous map count. "
+ "Leaking page mappings.\n");
+ }
+
+ /*
+ * End debugging.
+ */
+
+ drm_free_gatt_pages(*cur_page, 0);
+ drm_free_memctl(PAGE_SIZE);
+ --bm->cur_pages;
+ }
+ }
+ ttm_free(ttm->pages, ttm->num_pages * sizeof(*ttm->pages),
+ DRM_MEM_TTM);
+ ttm->pages = NULL;
+ }
+
+ drm_ctl_free(ttm, sizeof(*ttm), DRM_MEM_TTM);
+ return 0;
+}
+
+static int drm_ttm_populate(drm_ttm_t * ttm)
+{
+ struct page *page;
+ unsigned long i;
+ drm_buffer_manager_t *bm;
+ drm_ttm_backend_t *be;
+
+ if (ttm->state != ttm_unpopulated)
+ return 0;
+
+ bm = &ttm->dev->bm;
+ be = ttm->be;
+ for (i = 0; i < ttm->num_pages; ++i) {
+ page = ttm->pages[i];
+ if (!page) {
+ if (drm_alloc_memctl(PAGE_SIZE)) {
+ return -ENOMEM;
+ }
+ page = drm_alloc_gatt_pages(0);
+ if (!page) {
+ drm_free_memctl(PAGE_SIZE);
+ return -ENOMEM;
+ }
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,15))
+ SetPageLocked(page);
+#else
+ SetPageReserved(page);
+#endif
+ ttm->pages[i] = page;
+ ++bm->cur_pages;
+ }
+ }
+ be->populate(be, ttm->num_pages, ttm->pages);
+ ttm->state = ttm_unbound;
+ return 0;
+}
+
+/*
+ * Initialize a ttm.
+ */
+
+static drm_ttm_t *drm_init_ttm(struct drm_device *dev, unsigned long size)
+{
+ drm_bo_driver_t *bo_driver = dev->driver->bo_driver;
+ drm_ttm_t *ttm;
+
+ if (!bo_driver)
+ return NULL;
+
+ ttm = drm_ctl_calloc(1, sizeof(*ttm), DRM_MEM_TTM);
+ if (!ttm)
+ return NULL;
+
+#ifdef DRM_ODD_MM_COMPAT
+ INIT_LIST_HEAD(&ttm->p_mm_list);
+ INIT_LIST_HEAD(&ttm->vma_list);
+#endif
+
+ ttm->dev = dev;
+ atomic_set(&ttm->vma_count, 0);
+
+ ttm->destroy = 0;
+ ttm->num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
+
+ ttm->page_flags = 0;
+
+ /*
+ * Account also for AGP module memory usage.
+ */
+
+ ttm->pages = ttm_alloc(ttm->num_pages * sizeof(*ttm->pages),
+ DRM_MEM_TTM);
+ if (!ttm->pages) {
+ drm_destroy_ttm(ttm);
+ DRM_ERROR("Failed allocating page table\n");
+ return NULL;
+ }
+ memset(ttm->pages, 0, ttm->num_pages * sizeof(*ttm->pages));
+ ttm->be = bo_driver->create_ttm_backend_entry(dev);
+ if (!ttm->be) {
+ drm_destroy_ttm(ttm);
+ DRM_ERROR("Failed creating ttm backend entry\n");
+ return NULL;
+ }
+ ttm->state = ttm_unpopulated;
+ return ttm;
+}
+
+/*
+ * Unbind a ttm region from the aperture.
+ */
+
+int drm_evict_ttm(drm_ttm_t * ttm)
+{
+ drm_ttm_backend_t *be = ttm->be;
+ int ret;
+
+ switch (ttm->state) {
+ case ttm_bound:
+ if (be->needs_ub_cache_adjust(be)) {
+ ret = unmap_vma_pages(ttm);
+ if (ret) {
+ return ret;
+ }
+ }
+ be->unbind(be);
+ break;
+ default:
+ break;
+ }
+ ttm->state = ttm_evicted;
+ return 0;
+}
+
+void drm_fixup_ttm_caching(drm_ttm_t * ttm)
+{
+
+ if (ttm->state == ttm_evicted) {
+ drm_ttm_backend_t *be = ttm->be;
+ if (be->needs_ub_cache_adjust(be)) {
+ drm_set_caching(ttm, 0);
+ }
+ ttm->state = ttm_unbound;
+ }
+}
+
+int drm_unbind_ttm(drm_ttm_t * ttm)
+{
+ int ret = 0;
+
+ if (ttm->state == ttm_bound)
+ ret = drm_evict_ttm(ttm);
+
+ if (ret)
+ return ret;
+
+ drm_fixup_ttm_caching(ttm);
+ return 0;
+}
+
+int drm_bind_ttm(drm_ttm_t * ttm, int cached, unsigned long aper_offset)
+{
+
+ int ret = 0;
+ drm_ttm_backend_t *be;
+
+ if (!ttm)
+ return -EINVAL;
+ if (ttm->state == ttm_bound)
+ return 0;
+
+ be = ttm->be;
+
+ ret = drm_ttm_populate(ttm);
+ if (ret)
+ return ret;
+ if (ttm->state == ttm_unbound && !cached) {
+ ret = unmap_vma_pages(ttm);
+ if (ret)
+ return ret;
+
+ drm_set_caching(ttm, DRM_TTM_PAGE_UNCACHED);
+ }
+#ifdef DRM_ODD_MM_COMPAT
+ else if (ttm->state == ttm_evicted && !cached) {
+ ret = drm_ttm_lock_mm(ttm);
+ if (ret)
+ return ret;
+ }
+#endif
+ if ((ret = be->bind(be, aper_offset, cached))) {
+ ttm->state = ttm_evicted;
+#ifdef DRM_ODD_MM_COMPAT
+ if (be->needs_ub_cache_adjust(be))
+ drm_ttm_unlock_mm(ttm);
+#endif
+ DRM_ERROR("Couldn't bind backend.\n");
+ return ret;
+ }
+
+ ttm->aper_offset = aper_offset;
+ ttm->state = ttm_bound;
+
+#ifdef DRM_ODD_MM_COMPAT
+ if (be->needs_ub_cache_adjust(be)) {
+ ret = drm_ttm_remap_bound(ttm);
+ if (ret)
+ return ret;
+ }
+#endif
+
+ return 0;
+}
+
+/*
+ * dev->struct_mutex locked.
+ */
+static void drm_ttm_object_remove(drm_device_t * dev, drm_ttm_object_t * object)
+{
+ drm_map_list_t *list = &object->map_list;
+ drm_local_map_t *map;
+
+ if (list->user_token)
+ drm_ht_remove_item(&dev->map_hash, &list->hash);
+
+ if (list->file_offset_node) {
+ drm_mm_put_block(list->file_offset_node);
+ list->file_offset_node = NULL;
+ }
+
+ map = list->map;
+
+ if (map) {
+ drm_ttm_t *ttm = (drm_ttm_t *) map->offset;
+ if (ttm) {
+ if (drm_destroy_ttm(ttm) != -EBUSY) {
+ drm_ctl_free(map, sizeof(*map), DRM_MEM_TTM);
+ }
+ } else {
+ drm_ctl_free(map, sizeof(*map), DRM_MEM_TTM);
+ }
+ }
+
+ drm_ctl_free(object, sizeof(*object), DRM_MEM_TTM);
+}
+
+void drm_ttm_object_deref_locked(drm_device_t * dev, drm_ttm_object_t * to)
+{
+ if (atomic_dec_and_test(&to->usage)) {
+ drm_ttm_object_remove(dev, to);
+ }
+}
+
+void drm_ttm_object_deref_unlocked(drm_device_t * dev, drm_ttm_object_t * to)
+{
+ if (atomic_dec_and_test(&to->usage)) {
+ mutex_lock(&dev->struct_mutex);
+ if (atomic_read(&to->usage) == 0)
+ drm_ttm_object_remove(dev, to);
+ mutex_unlock(&dev->struct_mutex);
+ }
+}
+
+/*
+ * Create a ttm and add it to the drm book-keeping.
+ * dev->struct_mutex locked.
+ */
+
+int drm_ttm_object_create(drm_device_t * dev, unsigned long size,
+ uint32_t flags, drm_ttm_object_t ** ttm_object)
+{
+ drm_ttm_object_t *object;
+ drm_map_list_t *list;
+ drm_local_map_t *map;
+ drm_ttm_t *ttm;
+
+ object = drm_ctl_calloc(1, sizeof(*object), DRM_MEM_TTM);
+ if (!object)
+ return -ENOMEM;
+ object->flags = flags;
+ list = &object->map_list;
+
+ list->map = drm_ctl_calloc(1, sizeof(*map), DRM_MEM_TTM);
+ if (!list->map) {
+ drm_ttm_object_remove(dev, object);
+ return -ENOMEM;
+ }
+ map = list->map;
+
+ ttm = drm_init_ttm(dev, size);
+ if (!ttm) {
+ DRM_ERROR("Could not create ttm\n");
+ drm_ttm_object_remove(dev, object);
+ return -ENOMEM;
+ }
+
+ map->offset = (unsigned long)ttm;
+ map->type = _DRM_TTM;
+ map->flags = _DRM_REMOVABLE;
+ map->size = ttm->num_pages * PAGE_SIZE;
+ map->handle = (void *)object;
+
+ /*
+ * Add a one-page "hole" to the block size to avoid the mm subsystem
+ * merging vmas.
+ * FIXME: Is this really needed?
+ */
+
+ list->file_offset_node = drm_mm_search_free(&dev->offset_manager,
+ ttm->num_pages + 1, 0, 0);
+ if (!list->file_offset_node) {
+ drm_ttm_object_remove(dev, object);
+ return -ENOMEM;
+ }
+ list->file_offset_node = drm_mm_get_block(list->file_offset_node,
+ ttm->num_pages + 1, 0);
+
+ list->hash.key = list->file_offset_node->start;
+
+ if (drm_ht_insert_item(&dev->map_hash, &list->hash)) {
+ drm_ttm_object_remove(dev, object);
+ return -ENOMEM;
+ }
+
+ list->user_token = ((drm_u64_t) list->hash.key) << PAGE_SHIFT;
+ ttm->mapping_offset = list->hash.key;
+ atomic_set(&object->usage, 1);
+ *ttm_object = object;
+ return 0;
+}