2 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
3 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice (including the next
14 * paragraph) shall be included in all copies or substantial portions of the
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
21 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
22 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
23 * OTHER DEALINGS IN THE SOFTWARE.
26 * Rickard E. (Rik) Faith <faith@valinux.com>
27 * Gareth Hughes <gareth@valinux.com>
29 * $FreeBSD: head/sys/dev/drm2/drm_dma.c 235783 2012-05-22 11:07:44Z kib $
33 * Support code for DMA buffer management.
35 * The implementation used to be significantly more complicated, but the
36 * complexity has been moved into the drivers as different buffer management
42 int drm_dma_setup(struct drm_device *dev)
45 dev->dma = kmalloc(sizeof(*dev->dma), M_DRM,
46 M_WAITOK | M_NULLOK | M_ZERO);
50 spin_init(&dev->dma_lock, "drmdma_lock");
55 void drm_dma_takedown(struct drm_device *dev)
57 drm_device_dma_t *dma = dev->dma;
63 /* Clear dma buffers */
64 for (i = 0; i <= DRM_MAX_ORDER; i++) {
65 if (dma->bufs[i].seg_count) {
66 DRM_DEBUG("order %d: buf_count = %d,"
67 " seg_count = %d\n", i, dma->bufs[i].buf_count,
68 dma->bufs[i].seg_count);
69 for (j = 0; j < dma->bufs[i].seg_count; j++) {
70 drm_pci_free(dev, dma->bufs[i].seglist[j]);
72 drm_free(dma->bufs[i].seglist, M_DRM);
75 if (dma->bufs[i].buf_count) {
76 for (j = 0; j < dma->bufs[i].buf_count; j++) {
77 drm_free(dma->bufs[i].buflist[j].dev_private,
80 drm_free(dma->bufs[i].buflist, M_DRM);
84 drm_free(dma->buflist, M_DRM);
85 drm_free(dma->pagelist, M_DRM);
86 drm_free(dev->dma, M_DRM);
88 spin_uninit(&dev->dma_lock);
92 void drm_free_buffer(struct drm_device *dev, drm_buf_t *buf)
102 void drm_reclaim_buffers(struct drm_device *dev, struct drm_file *file_priv)
104 drm_device_dma_t *dma = dev->dma;
110 for (i = 0; i < dma->buf_count; i++) {
111 if (dma->buflist[i]->file_priv == file_priv) {
112 switch (dma->buflist[i]->list) {
114 drm_free_buffer(dev, dma->buflist[i]);
117 dma->buflist[i]->list = DRM_LIST_RECLAIM;
120 /* Buffer already on hardware. */
127 /* Call into the driver-specific DMA handler */
128 int drm_dma(struct drm_device *dev, void *data, struct drm_file *file_priv)
131 if (dev->driver->dma_ioctl) {
132 /* shared code returns -errno */
133 return -dev->driver->dma_ioctl(dev, data, file_priv);
135 DRM_DEBUG("DMA ioctl on driver with no dma handler\n");