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drm_dma.c

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/**
 * \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 "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.
 */
00046 int drm_dma_setup(struct drm_device *dev)
{
      int i;

      dev->dma = drm_alloc(sizeof(*dev->dma), DRM_MEM_DRIVER);
      if (!dev->dma)
            return -ENOMEM;

      memset(dev->dma, 0, sizeof(*dev->dma));

      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.
 */
00070 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]);
                        }
                  }
                  drm_free(dma->bufs[i].seglist,
                         dma->bufs[i].seg_count
                         * sizeof(*dma->bufs[0].seglist), DRM_MEM_SEGS);
            }
            if (dma->bufs[i].buf_count) {
                  for (j = 0; j < dma->bufs[i].buf_count; j++) {
                        if (dma->bufs[i].buflist[j].dev_private) {
                              drm_free(dma->bufs[i].buflist[j].
                                     dev_private,
                                     dma->bufs[i].buflist[j].
                                     dev_priv_size, DRM_MEM_BUFS);
                        }
                  }
                  drm_free(dma->bufs[i].buflist,
                         dma->bufs[i].buf_count *
                         sizeof(*dma->bufs[0].buflist), DRM_MEM_BUFS);
            }
      }

      if (dma->buflist) {
            drm_free(dma->buflist,
                   dma->buf_count * sizeof(*dma->buflist), DRM_MEM_BUFS);
      }

      if (dma->pagelist) {
            drm_free(dma->pagelist,
                   dma->page_count * sizeof(*dma->pagelist),
                   DRM_MEM_PAGES);
      }
      drm_free(dev->dma, sizeof(*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.
 */
00132 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;

      if (drm_core_check_feature(dev, DRIVER_DMA_QUEUE)
          && waitqueue_active(&buf->dma_wait)) {
            wake_up_interruptible(&buf->dma_wait);
      }
}

/**
 * Reclaim the buffers.
 *
 * \param file_priv DRM file private.
 *
 * Frees each buffer associated with \p file_priv not already on the hardware.
 */
00155 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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