Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / gpu / drm / ttm / ttm_agp_backend.c

diff --git a/kernel/drivers/gpu/drm/ttm/ttm_agp_backend.c b/kernel/drivers/gpu/drm/ttm/ttm_agp_backend.c
new file mode 100644 (file)
index 0000000..764be36
--- /dev/null
+++ b/kernel/drivers/gpu/drm/ttm/ttm_agp_backend.c
@@ -0,0 +1,152 @@
+/**************************************************************************
+ *
+ * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., 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 above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * 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.
+ *
+ **************************************************************************/
+/*
+ * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
+ *          Keith Packard.
+ */
+
+#define pr_fmt(fmt) "[TTM] " fmt
+
+#include <drm/ttm/ttm_module.h>
+#include <drm/ttm/ttm_bo_driver.h>
+#include <drm/ttm/ttm_page_alloc.h>
+#ifdef TTM_HAS_AGP
+#include <drm/ttm/ttm_placement.h>
+#include <linux/agp_backend.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+#include <asm/agp.h>
+
+struct ttm_agp_backend {
+       struct ttm_tt ttm;
+       struct agp_memory *mem;
+       struct agp_bridge_data *bridge;
+};
+
+static int ttm_agp_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
+{
+       struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
+       struct drm_mm_node *node = bo_mem->mm_node;
+       struct agp_memory *mem;
+       int ret, cached = (bo_mem->placement & TTM_PL_FLAG_CACHED);
+       unsigned i;
+
+       mem = agp_allocate_memory(agp_be->bridge, ttm->num_pages, AGP_USER_MEMORY);
+       if (unlikely(mem == NULL))
+               return -ENOMEM;
+
+       mem->page_count = 0;
+       for (i = 0; i < ttm->num_pages; i++) {
+               struct page *page = ttm->pages[i];
+
+               if (!page)
+                       page = ttm->dummy_read_page;
+
+               mem->pages[mem->page_count++] = page;
+       }
+       agp_be->mem = mem;
+
+       mem->is_flushed = 1;
+       mem->type = (cached) ? AGP_USER_CACHED_MEMORY : AGP_USER_MEMORY;
+
+       ret = agp_bind_memory(mem, node->start);
+       if (ret)
+               pr_err("AGP Bind memory failed\n");
+
+       return ret;
+}
+
+static int ttm_agp_unbind(struct ttm_tt *ttm)
+{
+       struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
+
+       if (agp_be->mem) {
+               if (agp_be->mem->is_bound)
+                       return agp_unbind_memory(agp_be->mem);
+               agp_free_memory(agp_be->mem);
+               agp_be->mem = NULL;
+       }
+       return 0;
+}
+
+static void ttm_agp_destroy(struct ttm_tt *ttm)
+{
+       struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
+
+       if (agp_be->mem)
+               ttm_agp_unbind(ttm);
+       ttm_tt_fini(ttm);
+       kfree(agp_be);
+}
+
+static struct ttm_backend_func ttm_agp_func = {
+       .bind = ttm_agp_bind,
+       .unbind = ttm_agp_unbind,
+       .destroy = ttm_agp_destroy,
+};
+
+struct ttm_tt *ttm_agp_tt_create(struct ttm_bo_device *bdev,
+                                struct agp_bridge_data *bridge,
+                                unsigned long size, uint32_t page_flags,
+                                struct page *dummy_read_page)
+{
+       struct ttm_agp_backend *agp_be;
+
+       agp_be = kmalloc(sizeof(*agp_be), GFP_KERNEL);
+       if (!agp_be)
+               return NULL;
+
+       agp_be->mem = NULL;
+       agp_be->bridge = bridge;
+       agp_be->ttm.func = &ttm_agp_func;
+
+       if (ttm_tt_init(&agp_be->ttm, bdev, size, page_flags, dummy_read_page)) {
+               kfree(agp_be);
+               return NULL;
+       }
+
+       return &agp_be->ttm;
+}
+EXPORT_SYMBOL(ttm_agp_tt_create);
+
+int ttm_agp_tt_populate(struct ttm_tt *ttm)
+{
+       if (ttm->state != tt_unpopulated)
+               return 0;
+
+       return ttm_pool_populate(ttm);
+}
+EXPORT_SYMBOL(ttm_agp_tt_populate);
+
+void ttm_agp_tt_unpopulate(struct ttm_tt *ttm)
+{
+       ttm_pool_unpopulate(ttm);
+}
+EXPORT_SYMBOL(ttm_agp_tt_unpopulate);
+
+#endif