AGP backends for TTM.

1 files changed, 165 insertions, 0 deletions

diff --git a/linux-core/drm_agpsupport.c b/linux-core/drm_agpsupport.c
index dce27cdf..92868005 100644
--- a/linux-core/drm_agpsupport.c
+++ b/linux-core/drm_agpsupport.c
@@ -552,4 +552,169 @@ int drm_agp_unbind_memory(DRM_AGP_MEM * handle)
 	return agp_unbind_memory(handle);
 }
 
+/*
+ * AGP ttm backend interface.
+ */
+
+static int drm_agp_needs_cache_adjust_true(drm_ttm_backend_t *backend) {
+	return TRUE;
+}
+
+static int drm_agp_needs_cache_adjust_false(drm_ttm_backend_t *backend) {
+	return FALSE;
+}
+
+#define AGP_MEM_USER (1 << 16)
+#define AGP_MEM_UCACHED (2 << 16)
+
+static int drm_agp_populate(drm_ttm_backend_t *backend, unsigned long num_pages, 
+			    struct page **pages) {
+
+	drm_agp_ttm_priv *agp_priv = (drm_agp_ttm_priv *) backend->private;
+	struct page **cur_page, **last_page = pages + num_pages;
+	DRM_AGP_MEM *mem;
+
+	DRM_DEBUG("drm_agp_populate_ttm\n");
+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,11)
+	mem = drm_agp_allocate_memory(num_pages, agp_priv->mem_type);
+#else
+	mem = drm_agp_allocate_memory(agp_priv->bridge, num_pages, agp_priv->mem_type);
+#endif
+	if (!mem) 
+		return -1;
+
+	DRM_DEBUG("Current page count is %ld\n", (long) mem->page_count);
+	mem->page_count = 0;
+	for (cur_page = pages; cur_page < last_page; ++cur_page) {
+		mem->memory[mem->page_count++] = page_to_phys(*cur_page);
+	}
+	agp_priv->mem = mem;
+	return 0;
+}
+
+static int drm_agp_bind_ttm(drm_ttm_backend_t *backend, unsigned long offset) {
+
+	drm_agp_ttm_priv *agp_priv = (drm_agp_ttm_priv *) backend->private;
+	DRM_AGP_MEM *mem = agp_priv->mem;
+	int ret;
+
+	DRM_DEBUG("drm_agp_bind_ttm\n");
+	mem->is_flushed = FALSE;
+	ret = drm_agp_bind_memory(mem, offset);
+	if (ret) {
+		DRM_ERROR("AGP Bind memory failed\n");
+	}
+	return ret;
+}
+
+static int drm_agp_unbind_ttm(drm_ttm_backend_t *backend) {
+
+	drm_agp_ttm_priv *agp_priv = (drm_agp_ttm_priv *) backend->private;
+
+	DRM_DEBUG("drm_agp_unbind_ttm\n");
+	if (agp_priv->mem->is_bound)
+		return drm_agp_unbind_memory(agp_priv->mem);
+	else
+		return 0;
+}
+
+static void drm_agp_clear_ttm(drm_ttm_backend_t *backend) {
+
+	drm_agp_ttm_priv *agp_priv = (drm_agp_ttm_priv *) backend->private;
+	DRM_AGP_MEM *mem = agp_priv->mem;
+
+	DRM_DEBUG("drm_agp_clear_ttm\n");
+	if (mem) {
+		if (mem->is_bound) {
+			drm_agp_unbind_memory(mem);
+		}
+		agp_free_memory(mem);
+	}
+	agp_priv->mem = NULL;
+}
+
+static void drm_agp_destroy_ttm(drm_ttm_backend_t *backend) {
+
+	drm_agp_ttm_priv *agp_priv; 
+	
+	if (backend) {
+	  DRM_DEBUG("drm_agp_destroy_ttm\n");
+	  agp_priv = (drm_agp_ttm_priv *) backend->private;
+		if (agp_priv) {
+			if (agp_priv->mem) {
+				drm_agp_clear_ttm(backend);
+			}
+			drm_free(agp_priv, sizeof(*agp_priv), DRM_MEM_MAPPINGS);
+		}
+		drm_free(backend, sizeof(*backend), DRM_MEM_MAPPINGS);
+	}
+}
+	
+
+drm_ttm_backend_t *drm_agp_init_ttm_uncached(struct drm_device *dev) {
+
+        drm_ttm_backend_t *agp_be;
+	drm_agp_ttm_priv *agp_priv;
+
+	agp_be = drm_calloc(1, sizeof(*agp_be), DRM_MEM_MAPPINGS);
+
+	if (!agp_be)
+		return NULL;
+	
+	agp_priv = drm_calloc(1, sizeof(agp_priv), DRM_MEM_MAPPINGS);
+	
+	if (!agp_priv) {
+		drm_free(agp_be, sizeof(*agp_be), DRM_MEM_MAPPINGS);
+		return NULL;
+	}
+	
+	agp_priv->mem = NULL;
+	agp_priv->mem_type = AGP_MEM_USER;
+	agp_priv->bridge = dev->agp->bridge;
+	agp_priv->populated = FALSE;
+	agp_be->aperture_base = dev->agp->agp_info.aper_base;
+	agp_be->private = (void *) agp_priv;
+	agp_be->needs_cache_adjust = drm_agp_needs_cache_adjust_true;
+	agp_be->populate = drm_agp_populate;
+	agp_be->clear = drm_agp_clear_ttm;
+	agp_be->bind = drm_agp_bind_ttm;
+	agp_be->unbind = drm_agp_unbind_ttm;
+	agp_be->destroy = drm_agp_destroy_ttm;
+	return agp_be;
+}
+
+
+drm_ttm_backend_t *drm_agp_init_ttm_cached(struct drm_device *dev) {
+
+        drm_ttm_backend_t *agp_be;
+	drm_agp_ttm_priv *agp_priv;
+
+	agp_be = drm_calloc(1, sizeof(*agp_be), DRM_MEM_MAPPINGS);
+
+	if (!agp_be)
+		return NULL;
+	
+	agp_priv = drm_calloc(1, sizeof(agp_priv), DRM_MEM_MAPPINGS);
+	
+	if (!agp_priv) {
+		drm_free(agp_be, sizeof(*agp_be), DRM_MEM_MAPPINGS);
+		return NULL;
+	}
+	
+	agp_priv->mem = NULL;
+	agp_priv->mem_type = AGP_MEM_UCACHED;
+	agp_priv->bridge = dev->agp->bridge;
+	agp_priv->populated = FALSE;
+	agp_be->aperture_base = dev->agp->agp_info.aper_base;
+	agp_be->private = (void *) agp_priv;
+	agp_be->needs_cache_adjust = drm_agp_needs_cache_adjust_false;
+	agp_be->populate = drm_agp_populate;
+	agp_be->clear = drm_agp_clear_ttm;
+	agp_be->bind = drm_agp_bind_ttm;
+	agp_be->unbind = drm_agp_unbind_ttm;
+	agp_be->destroy = drm_agp_destroy_ttm;
+	return agp_be;
+}
+
+
 #endif				/* __OS_HAS_AGP */