[mirror_ubuntu-focal-kernel.git] / drivers / gpu / drm / drm_dma.c

/*
 * \file drm_dma.c
 * DMA IOCTL and function support
 *
 * \author Rickard E. (Rik) Faith <faith@valinux.com>
 * \author Gareth Hughes <gareth@valinux.com>
 */

/*
 * Created: Fri Mar 19 14:30:16 1999 by faith@valinux.com
 *
 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas.
 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

#include <linux/export.h>

#include <drm/drm_drv.h>
#include <drm/drm_pci.h>
#include <drm/drm_print.h>

#include "drm_legacy.h"

/**
 * Initialize the DMA data.
 *
 * \param dev DRM device.
 * \return zero on success or a negative value on failure.
 *
 * Allocate and initialize a drm_device_dma structure.
 */
int drm_legacy_dma_setup(struct drm_device *dev)
{
	int i;

	if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA) ||
	    !drm_core_check_feature(dev, DRIVER_LEGACY))
		return 0;

	dev->buf_use = 0;
	atomic_set(&dev->buf_alloc, 0);

	dev->dma = kzalloc(sizeof(*dev->dma), GFP_KERNEL);
	if (!dev->dma)
		return -ENOMEM;

	for (i = 0; i <= DRM_MAX_ORDER; i++)
		memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0]));

	return 0;
}

/**
 * Cleanup the DMA resources.
 *
 * \param dev DRM device.
 *
 * Free all pages associated with DMA buffers, the buffers and pages lists, and
 * finally the drm_device::dma structure itself.
 */
void drm_legacy_dma_takedown(struct drm_device *dev)
{
	struct drm_device_dma *dma = dev->dma;
	int i, j;

	if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA) ||
	    !drm_core_check_feature(dev, DRIVER_LEGACY))
		return;

	if (!dma)
		return;

	/* Clear dma buffers */
	for (i = 0; i <= DRM_MAX_ORDER; i++) {
		if (dma->bufs[i].seg_count) {
			DRM_DEBUG("order %d: buf_count = %d,"
				  " seg_count = %d\n",
				  i,
				  dma->bufs[i].buf_count,
				  dma->bufs[i].seg_count);
			for (j = 0; j < dma->bufs[i].seg_count; j++) {
				if (dma->bufs[i].seglist[j]) {
					drm_pci_free(dev, dma->bufs[i].seglist[j]);
				}
			}
			kfree(dma->bufs[i].seglist);
		}
		if (dma->bufs[i].buf_count) {
			for (j = 0; j < dma->bufs[i].buf_count; j++) {
				kfree(dma->bufs[i].buflist[j].dev_private);
			}
			kfree(dma->bufs[i].buflist);
		}
	}

	kfree(dma->buflist);
	kfree(dma->pagelist);
	kfree(dev->dma);
	dev->dma = NULL;
}

/**
 * Free a buffer.
 *
 * \param dev DRM device.
 * \param buf buffer to free.
 *
 * Resets the fields of \p buf.
 */
void drm_legacy_free_buffer(struct drm_device *dev, struct drm_buf * buf)
{
	if (!buf)
		return;

	buf->waiting = 0;
	buf->pending = 0;
	buf->file_priv = NULL;
	buf->used = 0;
}

/**
 * Reclaim the buffers.
 *
 * \param file_priv DRM file private.
 *
 * Frees each buffer associated with \p file_priv not already on the hardware.
 */
void drm_legacy_reclaim_buffers(struct drm_device *dev,
				struct drm_file *file_priv)
{
	struct drm_device_dma *dma = dev->dma;
	int i;

	if (!dma)
		return;
	for (i = 0; i < dma->buf_count; i++) {
		if (dma->buflist[i]->file_priv == file_priv) {
			switch (dma->buflist[i]->list) {
			case DRM_LIST_NONE:
				drm_legacy_free_buffer(dev, dma->buflist[i]);
				break;
			case DRM_LIST_WAIT:
				dma->buflist[i]->list = DRM_LIST_RECLAIM;
				break;
			default:
				/* Buffer already on hardware. */
				break;
			}
		}
	}
}
Commit	Line	Data
45b2fda3	1	/*
b5e89ed5	2	* \file drm_dma.c
1da177e4 LT	3	* DMA IOCTL and function support
	4	*
	5	* \author Rickard E. (Rik) Faith <faith@valinux.com>
	6	* \author Gareth Hughes <gareth@valinux.com>
	7	*/
	8
	9	/*
	10	* Created: Fri Mar 19 14:30:16 1999 by faith@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
2d1a8a48	36	#include <linux/export.h>
0500c04e SR	37
	38	#include <drm/drm_drv.h>
	39	#include <drm/drm_pci.h>
	40	#include <drm/drm_print.h>
	41
ba8286fa	42	#include "drm_legacy.h"
1da177e4 LT	43
	44	/**
	45	* Initialize the DMA data.
b5e89ed5	46	*
1da177e4 LT	47	* \param dev DRM device.
	48	* \return zero on success or a negative value on failure.
	49	*
	50	* Allocate and initialize a drm_device_dma structure.
	51	*/
e2e99a82	52	int drm_legacy_dma_setup(struct drm_device *dev)
1da177e4 LT	53	{
	54	int i;
	55
e2e99a82	56	if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA) \|\|
fa538645	57	!drm_core_check_feature(dev, DRIVER_LEGACY))
e2e99a82	58	return 0;
e2e99a82 DV	59
	60	dev->buf_use = 0;
	61	atomic_set(&dev->buf_alloc, 0);
	62
6ebc22e6	63	dev->dma = kzalloc(sizeof(*dev->dma), GFP_KERNEL);
b5e89ed5	64	if (!dev->dma)
1da177e4 LT	65	return -ENOMEM;
1da177e4 LT	66
b5e89ed5	67	for (i = 0; i <= DRM_MAX_ORDER; i++)
1da177e4 LT	68	memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0]));
	69
	70	return 0;
	71	}
	72
	73	/**
	74	* Cleanup the DMA resources.
	75	*
	76	* \param dev DRM device.
	77	*
	78	* Free all pages associated with DMA buffers, the buffers and pages lists, and
59c51591	79	* finally the drm_device::dma structure itself.
1da177e4	80	*/
e2e99a82	81	void drm_legacy_dma_takedown(struct drm_device *dev)
1da177e4	82	{
cdd55a29	83	struct drm_device_dma *dma = dev->dma;
b5e89ed5	84	int i, j;
1da177e4	85
e2e99a82	86	if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA) \|\|
fa538645	87	!drm_core_check_feature(dev, DRIVER_LEGACY))
e2e99a82	88	return;
e2e99a82	89
b5e89ed5 DA	90	if (!dma)
b5e89ed5 DA	91	return;
1da177e4	92
b5e89ed5	93	/* Clear dma buffers */
1da177e4 LT	94	for (i = 0; i <= DRM_MAX_ORDER; i++) {
	95	if (dma->bufs[i].seg_count) {
	96	DRM_DEBUG("order %d: buf_count = %d,"
	97	" seg_count = %d\n",
	98	i,
	99	dma->bufs[i].buf_count,
	100	dma->bufs[i].seg_count);
	101	for (j = 0; j < dma->bufs[i].seg_count; j++) {
	102	if (dma->bufs[i].seglist[j]) {
ddf19b97	103	drm_pci_free(dev, dma->bufs[i].seglist[j]);
1da177e4 LT	104	}
1da177e4 LT	105	}
9a298b2a	106	kfree(dma->bufs[i].seglist);
1da177e4	107	}
b5e89ed5 DA	108	if (dma->bufs[i].buf_count) {
b5e89ed5 DA	109	for (j = 0; j < dma->bufs[i].buf_count; j++) {
9a298b2a	110	kfree(dma->bufs[i].buflist[j].dev_private);
1da177e4	111	}
9a298b2a	112	kfree(dma->bufs[i].buflist);
1da177e4 LT	113	}
	114	}
	115
9a298b2a EA	116	kfree(dma->buflist);
	117	kfree(dma->pagelist);
	118	kfree(dev->dma);
1da177e4 LT	119	dev->dma = NULL;
	120	}
	121
1da177e4 LT	122	/**
	123	* Free a buffer.
	124	*
	125	* \param dev DRM device.
	126	* \param buf buffer to free.
b5e89ed5	127	*
1da177e4 LT	128	* Resets the fields of \p buf.
1da177e4 LT	129	*/
a266162a	130	void drm_legacy_free_buffer(struct drm_device dev, struct drm_buf buf)
1da177e4	131	{
b5e89ed5 DA	132	if (!buf)
b5e89ed5 DA	133	return;
1da177e4	134
b5e89ed5 DA	135	buf->waiting = 0;
b5e89ed5 DA	136	buf->pending = 0;
6c340eac	137	buf->file_priv = NULL;
b5e89ed5	138	buf->used = 0;
1da177e4 LT	139	}
	140
	141	/**
	142	* Reclaim the buffers.
	143	*
6c340eac	144	* \param file_priv DRM file private.
1da177e4	145	*
6c340eac	146	* Frees each buffer associated with \p file_priv not already on the hardware.
1da177e4	147	*/
a266162a DV	148	void drm_legacy_reclaim_buffers(struct drm_device *dev,
a266162a DV	149	struct drm_file *file_priv)
1da177e4	150	{
cdd55a29	151	struct drm_device_dma *dma = dev->dma;
b5e89ed5	152	int i;
1da177e4	153
b5e89ed5 DA	154	if (!dma)
b5e89ed5 DA	155	return;
1da177e4	156	for (i = 0; i < dma->buf_count; i++) {
6c340eac	157	if (dma->buflist[i]->file_priv == file_priv) {
1da177e4 LT	158	switch (dma->buflist[i]->list) {
1da177e4 LT	159	case DRM_LIST_NONE:
a266162a	160	drm_legacy_free_buffer(dev, dma->buflist[i]);
1da177e4 LT	161	break;
	162	case DRM_LIST_WAIT:
	163	dma->buflist[i]->list = DRM_LIST_RECLAIM;
	164	break;
	165	default:
	166	/* Buffer already on hardware. */
	167	break;
	168	}
	169	}
	170	}
	171	}