[mirror_ubuntu-bionic-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/drmP.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_MODESET)) {
		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_MODESET)) {
		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
1da177e4	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>
760285e7	37	#include <drm/drmP.h>
ba8286fa	38	#include "drm_legacy.h"
1da177e4 LT	39
	40	/**
	41	* Initialize the DMA data.
b5e89ed5	42	*
1da177e4 LT	43	* \param dev DRM device.
	44	* \return zero on success or a negative value on failure.
	45	*
	46	* Allocate and initialize a drm_device_dma structure.
	47	*/
e2e99a82	48	int drm_legacy_dma_setup(struct drm_device *dev)
1da177e4 LT	49	{
	50	int i;
	51
e2e99a82 DV	52	if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA) \|\|
	53	drm_core_check_feature(dev, DRIVER_MODESET)) {
	54	return 0;
	55	}
	56
	57	dev->buf_use = 0;
	58	atomic_set(&dev->buf_alloc, 0);
	59
6ebc22e6	60	dev->dma = kzalloc(sizeof(*dev->dma), GFP_KERNEL);
b5e89ed5	61	if (!dev->dma)
1da177e4 LT	62	return -ENOMEM;
1da177e4 LT	63
b5e89ed5	64	for (i = 0; i <= DRM_MAX_ORDER; i++)
1da177e4 LT	65	memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0]));
	66
	67	return 0;
	68	}
	69
	70	/**
	71	* Cleanup the DMA resources.
	72	*
	73	* \param dev DRM device.
	74	*
	75	* Free all pages associated with DMA buffers, the buffers and pages lists, and
59c51591	76	* finally the drm_device::dma structure itself.
1da177e4	77	*/
e2e99a82	78	void drm_legacy_dma_takedown(struct drm_device *dev)
1da177e4	79	{
cdd55a29	80	struct drm_device_dma *dma = dev->dma;
b5e89ed5	81	int i, j;
1da177e4	82
e2e99a82 DV	83	if (!drm_core_check_feature(dev, DRIVER_HAVE_DMA) \|\|
	84	drm_core_check_feature(dev, DRIVER_MODESET)) {
	85	return;
	86	}
	87
b5e89ed5 DA	88	if (!dma)
b5e89ed5 DA	89	return;
1da177e4	90
b5e89ed5	91	/* Clear dma buffers */
1da177e4 LT	92	for (i = 0; i <= DRM_MAX_ORDER; i++) {
	93	if (dma->bufs[i].seg_count) {
	94	DRM_DEBUG("order %d: buf_count = %d,"
	95	" seg_count = %d\n",
	96	i,
	97	dma->bufs[i].buf_count,
	98	dma->bufs[i].seg_count);
	99	for (j = 0; j < dma->bufs[i].seg_count; j++) {
	100	if (dma->bufs[i].seglist[j]) {
ddf19b97	101	drm_pci_free(dev, dma->bufs[i].seglist[j]);
1da177e4 LT	102	}
1da177e4 LT	103	}
9a298b2a	104	kfree(dma->bufs[i].seglist);
1da177e4	105	}
b5e89ed5 DA	106	if (dma->bufs[i].buf_count) {
b5e89ed5 DA	107	for (j = 0; j < dma->bufs[i].buf_count; j++) {
9a298b2a	108	kfree(dma->bufs[i].buflist[j].dev_private);
1da177e4	109	}
9a298b2a	110	kfree(dma->bufs[i].buflist);
1da177e4 LT	111	}
	112	}
	113
9a298b2a EA	114	kfree(dma->buflist);
	115	kfree(dma->pagelist);
	116	kfree(dev->dma);
1da177e4 LT	117	dev->dma = NULL;
	118	}
	119
1da177e4 LT	120	/**
	121	* Free a buffer.
	122	*
	123	* \param dev DRM device.
	124	* \param buf buffer to free.
b5e89ed5	125	*
1da177e4 LT	126	* Resets the fields of \p buf.
1da177e4 LT	127	*/
a266162a	128	void drm_legacy_free_buffer(struct drm_device dev, struct drm_buf buf)
1da177e4	129	{
b5e89ed5 DA	130	if (!buf)
b5e89ed5 DA	131	return;
1da177e4	132
b5e89ed5 DA	133	buf->waiting = 0;
b5e89ed5 DA	134	buf->pending = 0;
6c340eac	135	buf->file_priv = NULL;
b5e89ed5	136	buf->used = 0;
1da177e4 LT	137	}
	138
	139	/**
	140	* Reclaim the buffers.
	141	*
6c340eac	142	* \param file_priv DRM file private.
1da177e4	143	*
6c340eac	144	* Frees each buffer associated with \p file_priv not already on the hardware.
1da177e4	145	*/
a266162a DV	146	void drm_legacy_reclaim_buffers(struct drm_device *dev,
a266162a DV	147	struct drm_file *file_priv)
1da177e4	148	{
cdd55a29	149	struct drm_device_dma *dma = dev->dma;
b5e89ed5	150	int i;
1da177e4	151
b5e89ed5 DA	152	if (!dma)
b5e89ed5 DA	153	return;
1da177e4	154	for (i = 0; i < dma->buf_count; i++) {
6c340eac	155	if (dma->buflist[i]->file_priv == file_priv) {
1da177e4 LT	156	switch (dma->buflist[i]->list) {
1da177e4 LT	157	case DRM_LIST_NONE:
a266162a	158	drm_legacy_free_buffer(dev, dma->buflist[i]);
1da177e4 LT	159	break;
	160	case DRM_LIST_WAIT:
	161	dma->buflist[i]->list = DRM_LIST_RECLAIM;
	162	break;
	163	default:
	164	/* Buffer already on hardware. */
	165	break;
	166	}
	167	}
	168	}
	169	}