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drm_dma.c revision 1.1 
      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_dma_setup(struct drm_device *dev)
     48 {
     49 	int i;
     50 
     51 	dev->dma = kzalloc(sizeof(*dev->dma), GFP_KERNEL);
     52 	if (!dev->dma)
     53 		return -ENOMEM;
     54 
     55 	for (i = 0; i <= DRM_MAX_ORDER; i++)
     56 		memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0]));
     57 
     58 	return 0;
     59 }
     60 
     61 /**
     62  * Cleanup the DMA resources.
     63  *
     64  * \param dev DRM device.
     65  *
     66  * Free all pages associated with DMA buffers, the buffers and pages lists, and
     67  * finally the drm_device::dma structure itself.
     68  */
     69 void drm_dma_takedown(struct drm_device *dev)
     70 {
     71 	struct drm_device_dma *dma = dev->dma;
     72 	int i, j;
     73 
     74 	if (!dma)
     75 		return;
     76 
     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,"
     81 				  " seg_count = %d\n",
     82 				  i,
     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]);
     88 				}
     89 			}
     90 			kfree(dma->bufs[i].seglist);
     91 		}
     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);
     95 			}
     96 			kfree(dma->bufs[i].buflist);
     97 		}
     98 	}
     99 
    100 	kfree(dma->buflist);
    101 	kfree(dma->pagelist);
    102 	kfree(dev->dma);
    103 	dev->dma = NULL;
    104 }
    105 
    106 /**
    107  * Free a buffer.
    108  *
    109  * \param dev DRM device.
    110  * \param buf buffer to free.
    111  *
    112  * Resets the fields of \p buf.
    113  */
    114 void drm_free_buffer(struct drm_device *dev, struct drm_buf * buf)
    115 {
    116 	if (!buf)
    117 		return;
    118 
    119 	buf->waiting = 0;
    120 	buf->pending = 0;
    121 	buf->file_priv = NULL;
    122 	buf->used = 0;
    123 }
    124 
    125 /**
    126  * Reclaim the buffers.
    127  *
    128  * \param file_priv DRM file private.
    129  *
    130  * Frees each buffer associated with \p file_priv not already on the hardware.
    131  */
    132 void drm_core_reclaim_buffers(struct drm_device *dev,
    133 			      struct drm_file *file_priv)
    134 {
    135 	struct drm_device_dma *dma = dev->dma;
    136 	int i;
    137 
    138 	if (!dma)
    139 		return;
    140 	for (i = 0; i < dma->buf_count; i++) {
    141 		if (dma->buflist[i]->file_priv == file_priv) {
    142 			switch (dma->buflist[i]->list) {
    143 			case DRM_LIST_NONE:
    144 				drm_free_buffer(dev, dma->buflist[i]);
    145 				break;
    146 			case DRM_LIST_WAIT:
    147 				dma->buflist[i]->list = DRM_LIST_RECLAIM;
    148 				break;
    149 			default:
    150 				/* Buffer already on hardware. */
    151 				break;
    152 			}
    153 		}
    154 	}
    155 }
    156 
    157 EXPORT_SYMBOL(drm_core_reclaim_buffers);
    158