3 * DMA IOCTL and function support
12 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
13 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
14 * All Rights Reserved.
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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,
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36 #include <linux/export.h>
38 #include "drm_legacy.h"
41 * Initialize the DMA data.
43 * \param dev DRM device.
44 * \return zero on success or a negative value on failure.
46 * Allocate and initialize a drm_device_dma structure.
48 int drm_legacy_dma_setup(struct drm_device *dev)
52 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA) ||
53 drm_core_check_feature(dev, DRIVER_MODESET)) {
58 atomic_set(&dev->buf_alloc, 0);
60 dev->dma = kzalloc(sizeof(*dev->dma), GFP_KERNEL);
64 for (i = 0; i <= DRM_MAX_ORDER; i++)
65 memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0]));
71 * Cleanup the DMA resources.
73 * \param dev DRM device.
75 * Free all pages associated with DMA buffers, the buffers and pages lists, and
76 * finally the drm_device::dma structure itself.
78 void drm_legacy_dma_takedown(struct drm_device *dev)
80 struct drm_device_dma *dma = dev->dma;
83 if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA) ||
84 drm_core_check_feature(dev, DRIVER_MODESET)) {
91 /* Clear dma buffers */
92 for (i = 0; i <= DRM_MAX_ORDER; i++) {
93 if (dma->bufs[i].seg_count) {
94 DRM_DEBUG("order %d: buf_count = %d,"
97 dma->bufs[i].buf_count,
98 dma->bufs[i].seg_count);
99 for (j = 0; j < dma->bufs[i].seg_count; j++) {
100 if (dma->bufs[i].seglist[j]) {
101 drm_pci_free(dev, dma->bufs[i].seglist[j]);
104 kfree(dma->bufs[i].seglist);
106 if (dma->bufs[i].buf_count) {
107 for (j = 0; j < dma->bufs[i].buf_count; j++) {
108 kfree(dma->bufs[i].buflist[j].dev_private);
110 kfree(dma->bufs[i].buflist);
115 kfree(dma->pagelist);
123 * \param dev DRM device.
124 * \param buf buffer to free.
126 * Resets the fields of \p buf.
128 void drm_legacy_free_buffer(struct drm_device *dev, struct drm_buf * buf)
135 buf->file_priv = NULL;
140 * Reclaim the buffers.
142 * \param file_priv DRM file private.
144 * Frees each buffer associated with \p file_priv not already on the hardware.
146 void drm_legacy_reclaim_buffers(struct drm_device *dev,
147 struct drm_file *file_priv)
149 struct drm_device_dma *dma = dev->dma;
154 for (i = 0; i < dma->buf_count; i++) {
155 if (dma->buflist[i]->file_priv == file_priv) {
156 switch (dma->buflist[i]->list) {
158 drm_legacy_free_buffer(dev, dma->buflist[i]);
161 dma->buflist[i]->list = DRM_LIST_RECLAIM;
164 /* Buffer already on hardware. */