[GitHub/mt8127/android_kernel_alcatel_ttab.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 "drmP.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_dma_setup(struct drm_device *dev)
{
	int i;

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

	memset(dev->dma, 0, sizeof(*dev->dma));

	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_dma_takedown(struct drm_device *dev)
{
	struct drm_device_dma *dma = dev->dma;
	int i, j;

	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_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;

	if (drm_core_check_feature(dev, DRIVER_DMA_QUEUE)
	    && waitqueue_active(&buf->dma_wait)) {
		wake_up_interruptible(&buf->dma_wait);
	}
}

/**
 * Reclaim the buffers.
 *
 * \param file_priv DRM file private.
 *
 * Frees each buffer associated with \p file_priv not already on the hardware.
 */
void drm_core_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_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;
			}
		}
	}
}

EXPORT_SYMBOL(drm_core_reclaim_buffers);
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
	36	#include "drmP.h"
	37
	38	/**
	39	* Initialize the DMA data.
b5e89ed5	40	*
1da177e4 LT	41	* \param dev DRM device.
	42	* \return zero on success or a negative value on failure.
	43	*
	44	* Allocate and initialize a drm_device_dma structure.
	45	*/
84b1fd10	46	int drm_dma_setup(struct drm_device *dev)
1da177e4 LT	47	{
	48	int i;
	49
9a298b2a	50	dev->dma = kmalloc(sizeof(*dev->dma), GFP_KERNEL);
b5e89ed5	51	if (!dev->dma)
1da177e4 LT	52	return -ENOMEM;
1da177e4 LT	53
b5e89ed5	54	memset(dev->dma, 0, sizeof(*dev->dma));
1da177e4	55
b5e89ed5	56	for (i = 0; i <= DRM_MAX_ORDER; i++)
1da177e4 LT	57	memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0]));
	58
	59	return 0;
	60	}
	61
	62	/**
	63	* Cleanup the DMA resources.
	64	*
	65	* \param dev DRM device.
	66	*
	67	* Free all pages associated with DMA buffers, the buffers and pages lists, and
59c51591	68	* finally the drm_device::dma structure itself.
1da177e4	69	*/
84b1fd10	70	void drm_dma_takedown(struct drm_device *dev)
1da177e4	71	{
cdd55a29	72	struct drm_device_dma *dma = dev->dma;
b5e89ed5	73	int i, j;
1da177e4	74
b5e89ed5 DA	75	if (!dma)
b5e89ed5 DA	76	return;
1da177e4	77
b5e89ed5	78	/* Clear dma buffers */
1da177e4 LT	79	for (i = 0; i <= DRM_MAX_ORDER; i++) {
	80	if (dma->bufs[i].seg_count) {
	81	DRM_DEBUG("order %d: buf_count = %d,"
	82	" seg_count = %d\n",
	83	i,
	84	dma->bufs[i].buf_count,
	85	dma->bufs[i].seg_count);
	86	for (j = 0; j < dma->bufs[i].seg_count; j++) {
	87	if (dma->bufs[i].seglist[j]) {
ddf19b97	88	drm_pci_free(dev, dma->bufs[i].seglist[j]);
1da177e4 LT	89	}
1da177e4 LT	90	}
9a298b2a	91	kfree(dma->bufs[i].seglist);
1da177e4	92	}
b5e89ed5 DA	93	if (dma->bufs[i].buf_count) {
b5e89ed5 DA	94	for (j = 0; j < dma->bufs[i].buf_count; j++) {
9a298b2a	95	kfree(dma->bufs[i].buflist[j].dev_private);
1da177e4	96	}
9a298b2a	97	kfree(dma->bufs[i].buflist);
1da177e4 LT	98	}
	99	}
	100
9a298b2a EA	101	kfree(dma->buflist);
	102	kfree(dma->pagelist);
	103	kfree(dev->dma);
1da177e4 LT	104	dev->dma = NULL;
	105	}
	106
1da177e4 LT	107	/**
	108	* Free a buffer.
	109	*
	110	* \param dev DRM device.
	111	* \param buf buffer to free.
b5e89ed5	112	*
1da177e4 LT	113	* Resets the fields of \p buf.
1da177e4 LT	114	*/
056219e2	115	void drm_free_buffer(struct drm_device dev, struct drm_buf buf)
1da177e4	116	{
b5e89ed5 DA	117	if (!buf)
b5e89ed5 DA	118	return;
1da177e4	119
b5e89ed5 DA	120	buf->waiting = 0;
b5e89ed5 DA	121	buf->pending = 0;
6c340eac	122	buf->file_priv = NULL;
b5e89ed5	123	buf->used = 0;
1da177e4	124
b5e89ed5 DA	125	if (drm_core_check_feature(dev, DRIVER_DMA_QUEUE)
b5e89ed5 DA	126	&& waitqueue_active(&buf->dma_wait)) {
1da177e4 LT	127	wake_up_interruptible(&buf->dma_wait);
	128	}
	129	}
	130
	131	/**
	132	* Reclaim the buffers.
	133	*
6c340eac	134	* \param file_priv DRM file private.
1da177e4	135	*
6c340eac	136	* Frees each buffer associated with \p file_priv not already on the hardware.
1da177e4	137	*/
6c340eac EA	138	void drm_core_reclaim_buffers(struct drm_device *dev,
6c340eac EA	139	struct drm_file *file_priv)
1da177e4	140	{
cdd55a29	141	struct drm_device_dma *dma = dev->dma;
b5e89ed5	142	int i;
1da177e4	143
b5e89ed5 DA	144	if (!dma)
b5e89ed5 DA	145	return;
1da177e4	146	for (i = 0; i < dma->buf_count; i++) {
6c340eac	147	if (dma->buflist[i]->file_priv == file_priv) {
1da177e4 LT	148	switch (dma->buflist[i]->list) {
	149	case DRM_LIST_NONE:
	150	drm_free_buffer(dev, dma->buflist[i]);
	151	break;
	152	case DRM_LIST_WAIT:
	153	dma->buflist[i]->list = DRM_LIST_RECLAIM;
	154	break;
	155	default:
	156	/* Buffer already on hardware. */
	157	break;
	158	}
	159	}
	160	}
	161	}
1da177e4	162
b5e89ed5	163	EXPORT_SYMBOL(drm_core_reclaim_buffers);