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drm_dma.c revision 1.1.1.2.28.1 
      1 /*	$NetBSD: drm_dma.c,v 1.1.1.2.28.1 2018/09/06 06:56:09 pgoyette Exp $	*/
      2 
      3 /**
      4  * \file drm_dma.c
      5  * DMA IOCTL and function support
      6  *
      7  * \author Rickard E. (Rik) Faith <faith (at) valinux.com>
      8  * \author Gareth Hughes <gareth (at) valinux.com>
      9  */
     10 
     11 /*
     12  * Created: Fri Mar 19 14:30:16 1999 by faith (at) valinux.com
     13  *
     14  * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
     15  * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
     16  * All Rights Reserved.
     17  *
     18  * Permission is hereby granted, free of charge, to any person obtaining a
     19  * copy of this software and associated documentation files (the "Software"),
     20  * to deal in the Software without restriction, including without limitation
     21  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
     22  * and/or sell copies of the Software, and to permit persons to whom the
     23  * Software is furnished to do so, subject to the following conditions:
     24  *
     25  * The above copyright notice and this permission notice (including the next
     26  * paragraph) shall be included in all copies or substantial portions of the
     27  * Software.
     28  *
     29  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     30  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     31  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     32  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
     33  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     34  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     35  * OTHER DEALINGS IN THE SOFTWARE.
     36  */
     37 
     38 #include <sys/cdefs.h>
     39 __KERNEL_RCSID(0, "$NetBSD: drm_dma.c,v 1.1.1.2.28.1 2018/09/06 06:56:09 pgoyette Exp $");
     40 
     41 #include <linux/export.h>
     42 #include <drm/drmP.h>
     43 #include "drm_legacy.h"
     44 
     45 /**
     46  * Initialize the DMA data.
     47  *
     48  * \param dev DRM device.
     49  * \return zero on success or a negative value on failure.
     50  *
     51  * Allocate and initialize a drm_device_dma structure.
     52  */
     53 int drm_legacy_dma_setup(struct drm_device *dev)
     54 {
     55 	int i;
     56 
     57 	if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA) ||
     58 	    drm_core_check_feature(dev, DRIVER_MODESET)) {
     59 		return 0;
     60 	}
     61 
     62 	dev->buf_use = 0;
     63 	atomic_set(&dev->buf_alloc, 0);
     64 
     65 	dev->dma = kzalloc(sizeof(*dev->dma), GFP_KERNEL);
     66 	if (!dev->dma)
     67 		return -ENOMEM;
     68 
     69 	for (i = 0; i <= DRM_MAX_ORDER; i++)
     70 		memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0]));
     71 
     72 	return 0;
     73 }
     74 
     75 /**
     76  * Cleanup the DMA resources.
     77  *
     78  * \param dev DRM device.
     79  *
     80  * Free all pages associated with DMA buffers, the buffers and pages lists, and
     81  * finally the drm_device::dma structure itself.
     82  */
     83 void drm_legacy_dma_takedown(struct drm_device *dev)
     84 {
     85 	struct drm_device_dma *dma = dev->dma;
     86 	int i, j;
     87 
     88 	if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA) ||
     89 	    drm_core_check_feature(dev, DRIVER_MODESET)) {
     90 		return;
     91 	}
     92 
     93 	if (!dma)
     94 		return;
     95 
     96 	/* Clear dma buffers */
     97 	for (i = 0; i <= DRM_MAX_ORDER; i++) {
     98 		if (dma->bufs[i].seg_count) {
     99 			DRM_DEBUG("order %d: buf_count = %d,"
    100 				  " seg_count = %d\n",
    101 				  i,
    102 				  dma->bufs[i].buf_count,
    103 				  dma->bufs[i].seg_count);
    104 			for (j = 0; j < dma->bufs[i].seg_count; j++) {
    105 				if (dma->bufs[i].seglist[j]) {
    106 					drm_pci_free(dev, dma->bufs[i].seglist[j]);
    107 				}
    108 			}
    109 			kfree(dma->bufs[i].seglist);
    110 		}
    111 		if (dma->bufs[i].buf_count) {
    112 			for (j = 0; j < dma->bufs[i].buf_count; j++) {
    113 				kfree(dma->bufs[i].buflist[j].dev_private);
    114 			}
    115 			kfree(dma->bufs[i].buflist);
    116 		}
    117 	}
    118 
    119 	kfree(dma->buflist);
    120 	kfree(dma->pagelist);
    121 	kfree(dev->dma);
    122 	dev->dma = NULL;
    123 }
    124 
    125 /**
    126  * Free a buffer.
    127  *
    128  * \param dev DRM device.
    129  * \param buf buffer to free.
    130  *
    131  * Resets the fields of \p buf.
    132  */
    133 void drm_legacy_free_buffer(struct drm_device *dev, struct drm_buf * buf)
    134 {
    135 	if (!buf)
    136 		return;
    137 
    138 	buf->waiting = 0;
    139 	buf->pending = 0;
    140 	buf->file_priv = NULL;
    141 	buf->used = 0;
    142 }
    143 
    144 /**
    145  * Reclaim the buffers.
    146  *
    147  * \param file_priv DRM file private.
    148  *
    149  * Frees each buffer associated with \p file_priv not already on the hardware.
    150  */
    151 void drm_legacy_reclaim_buffers(struct drm_device *dev,
    152 				struct drm_file *file_priv)
    153 {
    154 	struct drm_device_dma *dma = dev->dma;
    155 	int i;
    156 
    157 	if (!dma)
    158 		return;
    159 	for (i = 0; i < dma->buf_count; i++) {
    160 		if (dma->buflist[i]->file_priv == file_priv) {
    161 			switch (dma->buflist[i]->list) {
    162 			case DRM_LIST_NONE:
    163 				drm_legacy_free_buffer(dev, dma->buflist[i]);
    164 				break;
    165 			case DRM_LIST_WAIT:
    166 				dma->buflist[i]->list = DRM_LIST_RECLAIM;
    167 				break;
    168 			default:
    169 				/* Buffer already on hardware. */
    170 				break;
    171 			}
    172 		}
    173 	}
    174 }
    175