FreeBSD/Linux Kernel Cross Reference
sys/dev/drm/drm_pci.c

     /**
      * \file drm_pci.h
      * \brief PCI consistent, DMA-accessible memory functions.
      *
      * \author Eric Anholt <anholt@FreeBSD.org>
      */
     
     /*-
      * Copyright 2003 Eric Anholt.
     * 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, sublicense,
     * 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 NONINFRINGEMENT.  IN NO EVENT SHALL THE
     * AUTHOR 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.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/6.4/sys/dev/drm/drm_pci.c 153401 2005-12-14 00:52:59Z anholt $");
    
    #include "dev/drm/drmP.h"
    
    /**********************************************************************/
    /** \name PCI memory */
    /*@{*/
    
    #if defined(__FreeBSD__)
    static void
    drm_pci_busdma_callback(void *arg, bus_dma_segment_t *segs, int nsegs, int error)
    {
            drm_dma_handle_t *dmah = arg;
    
            if (error != 0)
                    return;
    
            KASSERT(nsegs == 1, ("drm_pci_busdma_callback: bad dma segment count"));
            dmah->busaddr = segs[0].ds_addr;
    }
    #endif
    
    /**
     * \brief Allocate a physically contiguous DMA-accessible consistent 
     * memory block.
     */
    drm_dma_handle_t *
    drm_pci_alloc(drm_device_t *dev, size_t size, size_t align, dma_addr_t maxaddr)
    {
            drm_dma_handle_t *dmah;
            int ret;
    
            /* Need power-of-two alignment, so fail the allocation if it isn't. */
            if ((align & (align - 1)) != 0) {
                    DRM_ERROR("drm_pci_alloc with non-power-of-two alignment %d\n",
                        (int)align);
                    return NULL;
            }
    
            dmah = malloc(sizeof(drm_dma_handle_t), M_DRM, M_ZERO | M_NOWAIT);
            if (dmah == NULL)
                    return NULL;
    
    #ifdef __FreeBSD__
            ret = bus_dma_tag_create(NULL, align, 0, /* tag, align, boundary */
                maxaddr, BUS_SPACE_MAXADDR, /* lowaddr, highaddr */
                NULL, NULL, /* filtfunc, filtfuncargs */
                size, 1, size, /* maxsize, nsegs, maxsegsize */
                BUS_DMA_ALLOCNOW, NULL, NULL, /* flags, lockfunc, lockfuncargs */
                &dmah->tag);
            if (ret != 0) {
                    free(dmah, M_DRM);
                    return NULL;
            }
    
            ret = bus_dmamem_alloc(dmah->tag, &dmah->vaddr, BUS_DMA_NOWAIT,
                &dmah->map);
            if (ret != 0) {
                    bus_dma_tag_destroy(dmah->tag);
                    free(dmah, M_DRM);
                    return NULL;
            }
    
            ret = bus_dmamap_load(dmah->tag, dmah->map, dmah->vaddr, size,
                drm_pci_busdma_callback, dmah, 0);
            if (ret != 0) {
                    bus_dmamem_free(dmah->tag, dmah->vaddr, dmah->map);
                    bus_dma_tag_destroy(dmah->tag);
                   free(dmah, M_DRM);
                   return NULL;
           }
   #elif defined(__NetBSD__)
           ret = bus_dmamem_alloc(dev->dma_tag, size, align, PAGE_SIZE,
               &dmah->seg, 1, &nsegs, BUS_DMA_NOWAIT);
           if ((ret != 0) || (nsegs != 1)) {
                   free(dmah, M_DRM);
                   return NULL;
           }
   
           ret = bus_dmamem_map(dev->dma_tag, &dmah->seg, 1, size, &dmah->addr,
               BUS_DMA_NOWAIT);
           if (ret != 0) {
                   bus_dmamem_free(dev->dma_tag, &dmah->seg, 1);
                   free(dmah, M_DRM);
                   return NULL;
           }
   
           dmah->dmaaddr = h->seg.ds_addr;
   #endif
   
           return dmah;
   }
   
   /**
    * \brief Free a DMA-accessible consistent memory block.
    */
   void
   drm_pci_free(drm_device_t *dev, drm_dma_handle_t *dmah)
   {
           if (dmah == NULL)
                   return;
   
   #if defined(__FreeBSD__)
           bus_dmamem_free(dmah->tag, dmah->vaddr, dmah->map);
           bus_dma_tag_destroy(dmah->tag);
   #elif defined(__NetBSD__)
           bus_dmamem_free(dev->dma_tag, &dmah->seg, 1);
   #endif
   
           free(dmah, M_DRM);
   }
   
   /*@}*/

Cache object: 10e9b10289142576f73f1109bfc1dc50