3 * DMA IOCTL and function support
5 * \author Rickard E. (Rik) Faith <faith@valinux.com>
6 * \author Gareth Hughes <gareth@valinux.com>
10 * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com
12 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
13 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
14 * All Rights Reserved.
16 * Permission is hereby granted, free of charge, to any person obtaining a
17 * copy of this software and associated documentation files (the "Software"),
18 * to deal in the Software without restriction, including without limitation
19 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
20 * and/or sell copies of the Software, and to permit persons to whom the
21 * Software is furnished to do so, subject to the following conditions:
23 * The above copyright notice and this permission notice (including the next
24 * paragraph) shall be included in all copies or substantial portions of the
27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
28 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
29 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
30 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
31 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
32 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
33 * OTHER DEALINGS IN THE SOFTWARE.
36 #include <linux/export.h>
40 * Initialize the DMA data.
42 * \param dev DRM device.
43 * \return zero on success or a negative value on failure.
45 * Allocate and initialize a drm_device_dma structure.
47 int drm_dma_setup(struct drm_device *dev)
51 dev->dma = kzalloc(sizeof(*dev->dma), GFP_KERNEL);
55 for (i = 0; i <= DRM_MAX_ORDER; i++)
56 memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0]));
62 * Cleanup the DMA resources.
64 * \param dev DRM device.
66 * Free all pages associated with DMA buffers, the buffers and pages lists, and
67 * finally the drm_device::dma structure itself.
69 void drm_dma_takedown(struct drm_device *dev)
71 struct drm_device_dma *dma = dev->dma;
77 /* Clear dma buffers */
78 for (i = 0; i <= DRM_MAX_ORDER; i++) {
79 if (dma->bufs[i].seg_count) {
80 DRM_DEBUG("order %d: buf_count = %d,"
83 dma->bufs[i].buf_count,
84 dma->bufs[i].seg_count);
85 for (j = 0; j < dma->bufs[i].seg_count; j++) {
86 if (dma->bufs[i].seglist[j]) {
87 drm_pci_free(dev, dma->bufs[i].seglist[j]);
90 kfree(dma->bufs[i].seglist);
92 if (dma->bufs[i].buf_count) {
93 for (j = 0; j < dma->bufs[i].buf_count; j++) {
94 kfree(dma->bufs[i].buflist[j].dev_private);
96 kfree(dma->bufs[i].buflist);
101 kfree(dma->pagelist);
109 * \param dev DRM device.
110 * \param buf buffer to free.
112 * Resets the fields of \p buf.
114 void drm_free_buffer(struct drm_device *dev, struct drm_buf * buf)
121 buf->file_priv = NULL;
126 * Reclaim the buffers.
128 * \param file_priv DRM file private.
130 * Frees each buffer associated with \p file_priv not already on the hardware.
132 void drm_core_reclaim_buffers(struct drm_device *dev,
133 struct drm_file *file_priv)
135 struct drm_device_dma *dma = dev->dma;
140 for (i = 0; i < dma->buf_count; i++) {
141 if (dma->buflist[i]->file_priv == file_priv) {
142 switch (dma->buflist[i]->list) {
144 drm_free_buffer(dev, dma->buflist[i]);
147 dma->buflist[i]->list = DRM_LIST_RECLAIM;
150 /* Buffer already on hardware. */
157 EXPORT_SYMBOL(drm_core_reclaim_buffers);