[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / char / drm / drm_pci.c

/* drm_pci.h -- PCI DMA memory management wrappers for DRM -*- linux-c -*- */
/**
 * \file drm_pci.c
 * \brief Functions and ioctls to manage PCI memory
 *
 * \warning These interfaces aren't stable yet.
 *
 * \todo Implement the remaining ioctl's for the PCI pools.
 * \todo The wrappers here are so thin that they would be better off inlined..
 *
 * \author Jose Fonseca <jrfonseca@tungstengraphics.com>
 * \author Leif Delgass <ldelgass@retinalburn.net>
 */

/*
 * Copyright 2003 Jos�Fonseca.
 * Copyright 2003 Leif Delgass.
 * 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 THE
 * AUTHORS 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/pci.h>
#include "drmP.h"

/**********************************************************************/
/** \name PCI memory */
/*@{*/

/**
 * \brief Allocate a PCI consistent memory block, for DMA.
 */
drm_dma_handle_t *drm_pci_alloc(drm_device_t * dev, size_t size, size_t align,
				dma_addr_t maxaddr)
{
	drm_dma_handle_t *dmah;
#ifdef DRM_DEBUG_MEMORY
	int area = DRM_MEM_DMA;

	spin_lock(&drm_mem_lock);
	if ((drm_ram_used >> PAGE_SHIFT)
	    > (DRM_RAM_PERCENT * drm_ram_available) / 100) {
		spin_unlock(&drm_mem_lock);
		return 0;
	}
	spin_unlock(&drm_mem_lock);
#endif

	/* pci_alloc_consistent only guarantees alignment to the smallest
	 * PAGE_SIZE order which is greater than or equal to the requested size.
	 * Return NULL here for now to make sure nobody tries for larger alignment
	 */
	if (align > size)
		return NULL;

	if (pci_set_dma_mask(dev->pdev, maxaddr) != 0) {
		DRM_ERROR("Setting pci dma mask failed\n");
		return NULL;
	}

	dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL);
	if (!dmah)
		return NULL;

	dmah->size = size;
	dmah->vaddr = pci_alloc_consistent(dev->pdev, size, &dmah->busaddr);

#ifdef DRM_DEBUG_MEMORY
	if (dmah->vaddr == NULL) {
		spin_lock(&drm_mem_lock);
		++drm_mem_stats[area].fail_count;
		spin_unlock(&drm_mem_lock);
		kfree(dmah);
		return NULL;
	}

	spin_lock(&drm_mem_lock);
	++drm_mem_stats[area].succeed_count;
	drm_mem_stats[area].bytes_allocated += size;
	drm_ram_used += size;
	spin_unlock(&drm_mem_lock);
#else
	if (dmah->vaddr == NULL) {
		kfree(dmah);
		return NULL;
	}
#endif

	memset(dmah->vaddr, 0, size);

	return dmah;
}

EXPORT_SYMBOL(drm_pci_alloc);

/**
 * \brief Free a PCI consistent memory block with freeing its descriptor.
 *
 * This function is for internal use in the Linux-specific DRM core code.
 */
void __drm_pci_free(drm_device_t * dev, drm_dma_handle_t * dmah)
{
#ifdef DRM_DEBUG_MEMORY
	int area = DRM_MEM_DMA;
	int alloc_count;
	int free_count;
#endif

	if (!dmah->vaddr) {
#ifdef DRM_DEBUG_MEMORY
		DRM_MEM_ERROR(area, "Attempt to free address 0\n");
#endif
	} else {
		pci_free_consistent(dev->pdev, dmah->size, dmah->vaddr,
				    dmah->busaddr);
	}

#ifdef DRM_DEBUG_MEMORY
	spin_lock(&drm_mem_lock);
	free_count = ++drm_mem_stats[area].free_count;
	alloc_count = drm_mem_stats[area].succeed_count;
	drm_mem_stats[area].bytes_freed += size;
	drm_ram_used -= size;
	spin_unlock(&drm_mem_lock);
	if (free_count > alloc_count) {
		DRM_MEM_ERROR(area,
			      "Excess frees: %d frees, %d allocs\n",
			      free_count, alloc_count);
	}
#endif

}

/**
 * \brief Free a PCI consistent memory block
 */
void drm_pci_free(drm_device_t * dev, drm_dma_handle_t * dmah)
{
	__drm_pci_free(dev, dmah);
	kfree(dmah);
}

EXPORT_SYMBOL(drm_pci_free);

/*@}*/
Commit	Line	Data
1da177e4 LT	1	/* drm_pci.h -- PCI DMA memory management wrappers for DRM -- linux-c -- */
	2	/**
	3	* \file drm_pci.c
	4	* \brief Functions and ioctls to manage PCI memory
	5	*
	6	* \warning These interfaces aren't stable yet.
	7	*
	8	* \todo Implement the remaining ioctl's for the PCI pools.
	9	* \todo The wrappers here are so thin that they would be better off inlined..
	10	*
	11	* \author Jose Fonseca <jrfonseca@tungstengraphics.com>
	12	* \author Leif Delgass <ldelgass@retinalburn.net>
	13	*/
	14
	15	/*
	16	* Copyright 2003 Jos�Fonseca.
	17	* Copyright 2003 Leif Delgass.
	18	* All Rights Reserved.
	19	*
	20	* Permission is hereby granted, free of charge, to any person obtaining a
	21	* copy of this software and associated documentation files (the "Software"),
	22	* to deal in the Software without restriction, including without limitation
	23	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	24	* and/or sell copies of the Software, and to permit persons to whom the
	25	* Software is furnished to do so, subject to the following conditions:
	26	*
	27	* The above copyright notice and this permission notice (including the next
	28	* paragraph) shall be included in all copies or substantial portions of the
	29	* Software.
	30	*
	31	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	32	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	33	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
	34	* AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
	35	* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
	36	* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
	37	*/
	38
	39	#include <linux/pci.h>
	40	#include "drmP.h"
	41
	42	/**********************************************************************/
	43	/** \name PCI memory */
	44	/@{/
	45
	46	/**
	47	* \brief Allocate a PCI consistent memory block, for DMA.
	48	*/
9c8da5eb DA	49	drm_dma_handle_t drm_pci_alloc(drm_device_t dev, size_t size, size_t align,
9c8da5eb DA	50	dma_addr_t maxaddr)
1da177e4	51	{
9c8da5eb	52	drm_dma_handle_t *dmah;
aa0ca6b4	53	#ifdef DRM_DEBUG_MEMORY
1da177e4 LT	54	int area = DRM_MEM_DMA;
	55
	56	spin_lock(&drm_mem_lock);
	57	if ((drm_ram_used >> PAGE_SHIFT)
	58	> (DRM_RAM_PERCENT * drm_ram_available) / 100) {
	59	spin_unlock(&drm_mem_lock);
	60	return 0;
	61	}
	62	spin_unlock(&drm_mem_lock);
	63	#endif
	64
	65	/* pci_alloc_consistent only guarantees alignment to the smallest
	66	* PAGE_SIZE order which is greater than or equal to the requested size.
	67	* Return NULL here for now to make sure nobody tries for larger alignment
	68	*/
	69	if (align > size)
	70	return NULL;
	71
	72	if (pci_set_dma_mask(dev->pdev, maxaddr) != 0) {
	73	DRM_ERROR("Setting pci dma mask failed\n");
	74	return NULL;
	75	}
	76
9c8da5eb DA	77	dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL);
	78	if (!dmah)
	79	return NULL;
b5e89ed5	80
9c8da5eb DA	81	dmah->size = size;
9c8da5eb DA	82	dmah->vaddr = pci_alloc_consistent(dev->pdev, size, &dmah->busaddr);
1da177e4	83
aa0ca6b4	84	#ifdef DRM_DEBUG_MEMORY
9c8da5eb	85	if (dmah->vaddr == NULL) {
1da177e4 LT	86	spin_lock(&drm_mem_lock);
	87	++drm_mem_stats[area].fail_count;
	88	spin_unlock(&drm_mem_lock);
9c8da5eb	89	kfree(dmah);
1da177e4 LT	90	return NULL;
	91	}
	92
	93	spin_lock(&drm_mem_lock);
	94	++drm_mem_stats[area].succeed_count;
	95	drm_mem_stats[area].bytes_allocated += size;
	96	drm_ram_used += size;
	97	spin_unlock(&drm_mem_lock);
	98	#else
9c8da5eb DA	99	if (dmah->vaddr == NULL) {
9c8da5eb DA	100	kfree(dmah);
1da177e4	101	return NULL;
9c8da5eb	102	}
1da177e4 LT	103	#endif
1da177e4 LT	104
9c8da5eb	105	memset(dmah->vaddr, 0, size);
1da177e4	106
9c8da5eb	107	return dmah;
1da177e4	108	}
b5e89ed5	109
1da177e4 LT	110	EXPORT_SYMBOL(drm_pci_alloc);
	111
	112	/**
9c8da5eb DA	113	* \brief Free a PCI consistent memory block with freeing its descriptor.
	114	*
	115	* This function is for internal use in the Linux-specific DRM core code.
1da177e4	116	*/
b5e89ed5	117	void __drm_pci_free(drm_device_t * dev, drm_dma_handle_t * dmah)
1da177e4	118	{
aa0ca6b4	119	#ifdef DRM_DEBUG_MEMORY
1da177e4 LT	120	int area = DRM_MEM_DMA;
	121	int alloc_count;
	122	int free_count;
	123	#endif
	124
9c8da5eb	125	if (!dmah->vaddr) {
aa0ca6b4	126	#ifdef DRM_DEBUG_MEMORY
1da177e4 LT	127	DRM_MEM_ERROR(area, "Attempt to free address 0\n");
	128	#endif
	129	} else {
9c8da5eb DA	130	pci_free_consistent(dev->pdev, dmah->size, dmah->vaddr,
9c8da5eb DA	131	dmah->busaddr);
1da177e4 LT	132	}
1da177e4 LT	133
aa0ca6b4	134	#ifdef DRM_DEBUG_MEMORY
1da177e4 LT	135	spin_lock(&drm_mem_lock);
	136	free_count = ++drm_mem_stats[area].free_count;
	137	alloc_count = drm_mem_stats[area].succeed_count;
	138	drm_mem_stats[area].bytes_freed += size;
	139	drm_ram_used -= size;
	140	spin_unlock(&drm_mem_lock);
	141	if (free_count > alloc_count) {
	142	DRM_MEM_ERROR(area,
	143	"Excess frees: %d frees, %d allocs\n",
	144	free_count, alloc_count);
	145	}
	146	#endif
	147
	148	}
9c8da5eb DA	149
	150	/**
	151	* \brief Free a PCI consistent memory block
	152	*/
b5e89ed5	153	void drm_pci_free(drm_device_t * dev, drm_dma_handle_t * dmah)
9c8da5eb DA	154	{
	155	__drm_pci_free(dev, dmah);
	156	kfree(dmah);
	157	}
b5e89ed5	158
1da177e4 LT	159	EXPORT_SYMBOL(drm_pci_free);
	160
	161	/@}/