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      1 /*-
      2  * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
      3  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
      4  * All Rights Reserved.
      5  *
      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:
     12  *
     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
     15  * Software.
     16  *
     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.
     24  *
     25  * Authors:
     26  *    Rickard E. (Rik) Faith <faith (at) valinux.com>
     27  *    Gareth Hughes <gareth (at) valinux.com>
     28  *
     29  */
     30 
     31 /** @file drm_dma.c
     32  * Support code for DMA buffer management.
     33  *
     34  * The implementation used to be significantly more complicated, but the
     35  * complexity has been moved into the drivers as different buffer management
     36  * schemes evolved.
     37  */
     38 
     39 #include "drmP.h"
     40 
     41 int drm_dma_setup(struct drm_device *dev)
     42 {
     43 
     44 	dev->dma = malloc(sizeof(*dev->dma), DRM_MEM_DRIVER, M_NOWAIT | M_ZERO);
     45 	if (dev->dma == NULL)
     46 		return ENOMEM;
     47 
     48 	DRM_SPININIT(&dev->dma_lock, "drmdma");
     49 
     50 	return 0;
     51 }
     52 
     53 void drm_dma_takedown(struct drm_device *dev)
     54 {
     55 	drm_device_dma_t  *dma = dev->dma;
     56 	int		  i, j;
     57 
     58 	if (dma == NULL)
     59 		return;
     60 
     61 	/* Clear dma buffers */
     62 	for (i = 0; i <= DRM_MAX_ORDER; i++) {
     63 		if (dma->bufs[i].seg_count) {
     64 			DRM_DEBUG("order %d: buf_count = %d,"
     65 			    " seg_count = %d\n", i, dma->bufs[i].buf_count,
     66 			    dma->bufs[i].seg_count);
     67 			for (j = 0; j < dma->bufs[i].seg_count; j++) {
     68 				drm_pci_free(dev, dma->bufs[i].seglist[j]);
     69 			}
     70 			if (dma->bufs[i].seglist)
     71 				free(dma->bufs[i].seglist, DRM_MEM_SEGS);
     72 		}
     73 
     74 	   	if (dma->bufs[i].buf_count) {
     75 		   	for (j = 0; j < dma->bufs[i].buf_count; j++) {
     76 				free(dma->bufs[i].buflist[j].dev_private,
     77 				    DRM_MEM_BUFS);
     78 			}
     79 			if (dma->bufs[i].buflist)
     80 				free(dma->bufs[i].buflist, DRM_MEM_BUFS);
     81 		}
     82 	}
     83 
     84 	if (dma->buflist)
     85 		free(dma->buflist, DRM_MEM_BUFS);
     86 	if (dma->pagelist)
     87 		free(dma->pagelist, DRM_MEM_PAGES);
     88 	if (dev->dma)
     89 		free(dev->dma, DRM_MEM_DRIVER);
     90 	dev->dma = NULL;
     91 	DRM_SPINUNINIT(&dev->dma_lock);
     92 }
     93 
     94 
     95 void drm_free_buffer(struct drm_device *dev, drm_buf_t *buf)
     96 {
     97 	if (!buf)
     98 		return;
     99 
    100 	buf->pending  = 0;
    101 	buf->file_priv= NULL;
    102 	buf->used     = 0;
    103 }
    104 
    105 void drm_reclaim_buffers(struct drm_device *dev, struct drm_file *file_priv)
    106 {
    107 	drm_device_dma_t *dma = dev->dma;
    108 	int		 i;
    109 
    110 	if (!dma)
    111 		return;
    112 
    113 	for (i = 0; i < dma->buf_count; i++) {
    114 		if (dma->buflist[i]->file_priv == file_priv) {
    115 			switch (dma->buflist[i]->list) {
    116 			case DRM_LIST_NONE:
    117 				drm_free_buffer(dev, dma->buflist[i]);
    118 				break;
    119 			case DRM_LIST_WAIT:
    120 				dma->buflist[i]->list = DRM_LIST_RECLAIM;
    121 				break;
    122 			default:
    123 				/* Buffer already on hardware. */
    124 				break;
    125 			}
    126 		}
    127 	}
    128 }
    129 
    130 /* Call into the driver-specific DMA handler */
    131 int drm_dma(struct drm_device *dev, void *data, struct drm_file *file_priv)
    132 {
    133 
    134 	if (dev->driver->dma_ioctl) {
    135 		/* shared code returns -errno */
    136 		return -dev->driver->dma_ioctl(dev, data, file_priv);
    137 	} else {
    138 		DRM_DEBUG("DMA ioctl on driver with no dma handler\n");
    139 		return EINVAL;
    140 	}
    141 }
    142