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drm_dma.c revision 1.1.1.1.6.1 
      1 /**
      2  * \file drm_dma.c
      3  * DMA IOCTL and function support
      4  *
      5  * \author Rickard E. (Rik) Faith <faith (at) valinux.com>
      6  * \author Gareth Hughes <gareth (at) valinux.com>
      7  */
      8 
      9 /*
     10  * Created: Fri Mar 19 14:30:16 1999 by faith (at) valinux.com
     11  *
     12  * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
     13  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
     14  * All Rights Reserved.
     15  *
     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:
     22  *
     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
     25  * Software.
     26  *
     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.
     34  */
     35 
     36 #include <linux/export.h>
     37 #include <drm/drmP.h>
     38 
     39 /**
     40  * Initialize the DMA data.
     41  *
     42  * \param dev DRM device.
     43  * \return zero on success or a negative value on failure.
     44  *
     45  * Allocate and initialize a drm_device_dma structure.
     46  */
     47 int drm_legacy_dma_setup(struct drm_device *dev)
     48 {
     49 	int i;
     50 
     51 	if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA) ||
     52 	    drm_core_check_feature(dev, DRIVER_MODESET)) {
     53 		return 0;
     54 	}
     55 
     56 	dev->buf_use = 0;
     57 	atomic_set(&dev->buf_alloc, 0);
     58 
     59 	dev->dma = kzalloc(sizeof(*dev->dma), GFP_KERNEL);
     60 	if (!dev->dma)
     61 		return -ENOMEM;
     62 
     63 	for (i = 0; i <= DRM_MAX_ORDER; i++)
     64 		memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0]));
     65 
     66 	return 0;
     67 }
     68 
     69 /**
     70  * Cleanup the DMA resources.
     71  *
     72  * \param dev DRM device.
     73  *
     74  * Free all pages associated with DMA buffers, the buffers and pages lists, and
     75  * finally the drm_device::dma structure itself.
     76  */
     77 void drm_legacy_dma_takedown(struct drm_device *dev)
     78 {
     79 	struct drm_device_dma *dma = dev->dma;
     80 	int i, j;
     81 
     82 	if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA) ||
     83 	    drm_core_check_feature(dev, DRIVER_MODESET)) {
     84 		return;
     85 	}
     86 
     87 	if (!dma)
     88 		return;
     89 
     90 	/* Clear dma buffers */
     91 	for (i = 0; i <= DRM_MAX_ORDER; i++) {
     92 		if (dma->bufs[i].seg_count) {
     93 			DRM_DEBUG("order %d: buf_count = %d,"
     94 				  " seg_count = %d\n",
     95 				  i,
     96 				  dma->bufs[i].buf_count,
     97 				  dma->bufs[i].seg_count);
     98 			for (j = 0; j < dma->bufs[i].seg_count; j++) {
     99 				if (dma->bufs[i].seglist[j]) {
    100 					drm_pci_free(dev, dma->bufs[i].seglist[j]);
    101 				}
    102 			}
    103 			kfree(dma->bufs[i].seglist);
    104 		}
    105 		if (dma->bufs[i].buf_count) {
    106 			for (j = 0; j < dma->bufs[i].buf_count; j++) {
    107 				kfree(dma->bufs[i].buflist[j].dev_private);
    108 			}
    109 			kfree(dma->bufs[i].buflist);
    110 		}
    111 	}
    112 
    113 	kfree(dma->buflist);
    114 	kfree(dma->pagelist);
    115 	kfree(dev->dma);
    116 	dev->dma = NULL;
    117 }
    118 
    119 /**
    120  * Free a buffer.
    121  *
    122  * \param dev DRM device.
    123  * \param buf buffer to free.
    124  *
    125  * Resets the fields of \p buf.
    126  */
    127 void drm_free_buffer(struct drm_device *dev, struct drm_buf * buf)
    128 {
    129 	if (!buf)
    130 		return;
    131 
    132 	buf->waiting = 0;
    133 	buf->pending = 0;
    134 	buf->file_priv = NULL;
    135 	buf->used = 0;
    136 }
    137 
    138 /**
    139  * Reclaim the buffers.
    140  *
    141  * \param file_priv DRM file private.
    142  *
    143  * Frees each buffer associated with \p file_priv not already on the hardware.
    144  */
    145 void drm_core_reclaim_buffers(struct drm_device *dev,
    146 			      struct drm_file *file_priv)
    147 {
    148 	struct drm_device_dma *dma = dev->dma;
    149 	int i;
    150 
    151 	if (!dma)
    152 		return;
    153 	for (i = 0; i < dma->buf_count; i++) {
    154 		if (dma->buflist[i]->file_priv == file_priv) {
    155 			switch (dma->buflist[i]->list) {
    156 			case DRM_LIST_NONE:
    157 				drm_free_buffer(dev, dma->buflist[i]);
    158 				break;
    159 			case DRM_LIST_WAIT:
    160 				dma->buflist[i]->list = DRM_LIST_RECLAIM;
    161 				break;
    162 			default:
    163 				/* Buffer already on hardware. */
    164 				break;
    165 			}
    166 		}
    167 	}
    168 }
    169 
    170 EXPORT_SYMBOL(drm_core_reclaim_buffers);
    171