FreeBSD/Linux Kernel Cross Reference
sys/dev/drm2/ttm/ttm_agp_backend.c

     /**************************************************************************
      *
      * 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,
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    /*
     * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
     *          Keith Packard.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <dev/drm2/drmP.h>
    #include <dev/drm2/ttm/ttm_module.h>
    #include <dev/drm2/ttm/ttm_bo_driver.h>
    #include <dev/drm2/ttm/ttm_page_alloc.h>
    #ifdef TTM_HAS_AGP
    #include <dev/drm2/ttm/ttm_placement.h>
    
    struct ttm_agp_backend {
            struct ttm_tt ttm;
            vm_offset_t offset;
            vm_page_t *pages;
            device_t bridge;
    };
    
    MALLOC_DEFINE(M_TTM_AGP, "ttm_agp", "TTM AGP Backend");
    
    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;
            int ret;
            unsigned i;
    
            for (i = 0; i < ttm->num_pages; i++) {
                    vm_page_t page = ttm->pages[i];
    
                    if (!page)
                            page = ttm->dummy_read_page;
    
                    agp_be->pages[i] = page;
            }
    
            agp_be->offset = node->start * PAGE_SIZE;
            ret = -agp_bind_pages(agp_be->bridge, agp_be->pages,
                                  ttm->num_pages << PAGE_SHIFT, agp_be->offset);
            if (ret)
                    printf("[TTM] 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);
    
            return -agp_unbind_pages(agp_be->bridge, ttm->num_pages << PAGE_SHIFT,
                                     agp_be->offset);
    }
    
    static void ttm_agp_destroy(struct ttm_tt *ttm)
    {
            struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
    
            ttm_tt_fini(ttm);
            free(agp_be->pages, M_TTM_AGP);
            free(agp_be, M_TTM_AGP);
    }
    
    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,
                                    device_t bridge,
                                    unsigned long size, uint32_t page_flags,
                                    vm_page_t dummy_read_page)
   {
           struct ttm_agp_backend *agp_be;
   
           agp_be = malloc(sizeof(*agp_be), M_TTM_AGP, M_WAITOK | M_ZERO);
   
           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)) {
                   free(agp_be, M_TTM_AGP);
                   return NULL;
           }
   
           agp_be->offset = 0;
           agp_be->pages = malloc(agp_be->ttm.num_pages * sizeof(*agp_be->pages),
                                  M_TTM_AGP, M_WAITOK);
   
           return &agp_be->ttm;
   }
   
   int ttm_agp_tt_populate(struct ttm_tt *ttm)
   {
           if (ttm->state != tt_unpopulated)
                   return 0;
   
           return ttm_pool_populate(ttm);
   }
   
   void ttm_agp_tt_unpopulate(struct ttm_tt *ttm)
   {
           ttm_pool_unpopulate(ttm);
   }
   
   #endif

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