FreeBSD/Linux Kernel Cross Reference
sys/dev/drm2/drm_dma.c

     /**
      * \file drm_dma.c
      * DMA IOCTL and function support
      *
      * \author Rickard E. (Rik) Faith <faith@valinux.com>
      * \author Gareth Hughes <gareth@valinux.com>
      */
     
     /*-
     * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com
     *
     * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
     * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
     * 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
     * VA LINUX SYSTEMS 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.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <dev/drm2/drmP.h>
    
    /**
     * Initialize the DMA data.
     *
     * \param dev DRM device.
     * \return zero on success or a negative value on failure.
     *
     * Allocate and initialize a drm_device_dma structure.
     */
    int drm_dma_setup(struct drm_device *dev)
    {
            int i;
    
            dev->dma = malloc(sizeof(*dev->dma), DRM_MEM_DRIVER, M_NOWAIT | M_ZERO);
            if (!dev->dma)
                    return -ENOMEM;
    
            for (i = 0; i <= DRM_MAX_ORDER; i++)
                    memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0]));
    
            return 0;
    }
    
    /**
     * Cleanup the DMA resources.
     *
     * \param dev DRM device.
     *
     * Free all pages associated with DMA buffers, the buffers and pages lists, and
     * finally the drm_device::dma structure itself.
     */
    void drm_dma_takedown(struct drm_device *dev)
    {
            struct drm_device_dma *dma = dev->dma;
            int i, j;
    
            if (!dma)
                    return;
    
            /* Clear dma buffers */
            for (i = 0; i <= DRM_MAX_ORDER; i++) {
                    if (dma->bufs[i].seg_count) {
                            DRM_DEBUG("order %d: buf_count = %d,"
                                      " seg_count = %d\n",
                                      i,
                                      dma->bufs[i].buf_count,
                                      dma->bufs[i].seg_count);
                            for (j = 0; j < dma->bufs[i].seg_count; j++) {
                                    if (dma->bufs[i].seglist[j]) {
                                            drm_pci_free(dev, dma->bufs[i].seglist[j]);
                                    }
                            }
                            free(dma->bufs[i].seglist, DRM_MEM_SEGS);
                    }
                    if (dma->bufs[i].buf_count) {
                            for (j = 0; j < dma->bufs[i].buf_count; j++) {
                                    free(dma->bufs[i].buflist[j].dev_private,
                                        DRM_MEM_BUFS);
                            }
                            free(dma->bufs[i].buflist, DRM_MEM_BUFS);
                   }
           }
   
           free(dma->buflist, DRM_MEM_BUFS);
           free(dma->pagelist, DRM_MEM_PAGES);
           free(dev->dma, DRM_MEM_DRIVER);
           dev->dma = NULL;
   }
   
   /**
    * Free a buffer.
    *
    * \param dev DRM device.
    * \param buf buffer to free.
    *
    * Resets the fields of \p buf.
    */
   void drm_free_buffer(struct drm_device *dev, struct drm_buf * buf)
   {
           if (!buf)
                   return;
   
           buf->waiting = 0;
           buf->pending = 0;
           buf->file_priv = NULL;
           buf->used = 0;
   }
   
   /**
    * Reclaim the buffers.
    *
    * \param file_priv DRM file private.
    *
    * Frees each buffer associated with \p file_priv not already on the hardware.
    */
   void drm_core_reclaim_buffers(struct drm_device *dev,
                                 struct drm_file *file_priv)
   {
           struct drm_device_dma *dma = dev->dma;
           int i;
   
           if (!dma)
                   return;
           for (i = 0; i < dma->buf_count; i++) {
                   if (dma->buflist[i]->file_priv == file_priv) {
                           switch (dma->buflist[i]->list) {
                           case DRM_LIST_NONE:
                                   drm_free_buffer(dev, dma->buflist[i]);
                                   break;
                           case DRM_LIST_WAIT:
                                   dma->buflist[i]->list = DRM_LIST_RECLAIM;
                                   break;
                           default:
                                   /* Buffer already on hardware. */
                                   break;
                           }
                   }
           }
   }
   
   EXPORT_SYMBOL(drm_core_reclaim_buffers);

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