151 строка
4.1 KiB
C
151 строка
4.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 OR MIT */
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/**************************************************************************
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*
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* Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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* USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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/*
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* Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
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* Keith Packard.
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*/
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#define pr_fmt(fmt) "[TTM] " fmt
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#include <drm/ttm/ttm_module.h>
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#include <drm/ttm/ttm_bo_driver.h>
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#include <drm/ttm/ttm_page_alloc.h>
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#include <drm/ttm/ttm_placement.h>
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#include <linux/agp_backend.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/io.h>
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#include <asm/agp.h>
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struct ttm_agp_backend {
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struct ttm_tt ttm;
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struct agp_memory *mem;
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struct agp_bridge_data *bridge;
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};
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static int ttm_agp_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
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{
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struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
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struct page *dummy_read_page = ttm_bo_glob.dummy_read_page;
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struct drm_mm_node *node = bo_mem->mm_node;
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struct agp_memory *mem;
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int ret, cached = (bo_mem->placement & TTM_PL_FLAG_CACHED);
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unsigned i;
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mem = agp_allocate_memory(agp_be->bridge, ttm->num_pages, AGP_USER_MEMORY);
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if (unlikely(mem == NULL))
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return -ENOMEM;
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mem->page_count = 0;
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for (i = 0; i < ttm->num_pages; i++) {
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struct page *page = ttm->pages[i];
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if (!page)
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page = dummy_read_page;
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mem->pages[mem->page_count++] = page;
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}
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agp_be->mem = mem;
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mem->is_flushed = 1;
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mem->type = (cached) ? AGP_USER_CACHED_MEMORY : AGP_USER_MEMORY;
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ret = agp_bind_memory(mem, node->start);
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if (ret)
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pr_err("AGP Bind memory failed\n");
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return ret;
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}
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static int ttm_agp_unbind(struct ttm_tt *ttm)
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{
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struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
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if (agp_be->mem) {
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if (agp_be->mem->is_bound)
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return agp_unbind_memory(agp_be->mem);
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agp_free_memory(agp_be->mem);
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agp_be->mem = NULL;
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}
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return 0;
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}
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static void ttm_agp_destroy(struct ttm_tt *ttm)
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{
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struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
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if (agp_be->mem)
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ttm_agp_unbind(ttm);
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ttm_tt_fini(ttm);
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kfree(agp_be);
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}
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static struct ttm_backend_func ttm_agp_func = {
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.bind = ttm_agp_bind,
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.unbind = ttm_agp_unbind,
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.destroy = ttm_agp_destroy,
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};
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struct ttm_tt *ttm_agp_tt_create(struct ttm_buffer_object *bo,
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struct agp_bridge_data *bridge,
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uint32_t page_flags)
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{
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struct ttm_agp_backend *agp_be;
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agp_be = kmalloc(sizeof(*agp_be), GFP_KERNEL);
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if (!agp_be)
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return NULL;
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agp_be->mem = NULL;
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agp_be->bridge = bridge;
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agp_be->ttm.func = &ttm_agp_func;
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if (ttm_tt_init(&agp_be->ttm, bo, page_flags)) {
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kfree(agp_be);
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return NULL;
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}
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return &agp_be->ttm;
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}
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EXPORT_SYMBOL(ttm_agp_tt_create);
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int ttm_agp_tt_populate(struct ttm_tt *ttm, struct ttm_operation_ctx *ctx)
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{
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if (ttm->state != tt_unpopulated)
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return 0;
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return ttm_pool_populate(ttm, ctx);
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}
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EXPORT_SYMBOL(ttm_agp_tt_populate);
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void ttm_agp_tt_unpopulate(struct ttm_tt *ttm)
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{
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ttm_pool_unpopulate(ttm);
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}
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EXPORT_SYMBOL(ttm_agp_tt_unpopulate);
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