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/drivers/char/drm/drm_pci.c

https://bitbucket.org/evzijst/gittest
C | 140 lines | 73 code | 17 blank | 50 comment | 11 complexity | a012fc86ba8f67a3e215e57361c0e34a MD5 | raw file
  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´┐ŻFonseca.
 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 */
 49void *drm_pci_alloc(drm_device_t * dev, size_t size, size_t align,
 50		    dma_addr_t maxaddr, dma_addr_t * busaddr)
 51{
 52	void *address;
 53#if DRM_DEBUG_MEMORY
 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
 77	address = pci_alloc_consistent(dev->pdev, size, busaddr);
 78
 79#if DRM_DEBUG_MEMORY
 80	if (address == NULL) {
 81		spin_lock(&drm_mem_lock);
 82		++drm_mem_stats[area].fail_count;
 83		spin_unlock(&drm_mem_lock);
 84		return NULL;
 85	}
 86
 87	spin_lock(&drm_mem_lock);
 88	++drm_mem_stats[area].succeed_count;
 89	drm_mem_stats[area].bytes_allocated += size;
 90	drm_ram_used += size;
 91	spin_unlock(&drm_mem_lock);
 92#else
 93	if (address == NULL)
 94		return NULL;
 95#endif
 96
 97	memset(address, 0, size);
 98
 99	return address;
100}
101EXPORT_SYMBOL(drm_pci_alloc);
102
103/**
104 * \brief Free a PCI consistent memory block.
105 */
106void
107drm_pci_free(drm_device_t * dev, size_t size, void *vaddr, dma_addr_t busaddr)
108{
109#if DRM_DEBUG_MEMORY
110	int area = DRM_MEM_DMA;
111	int alloc_count;
112	int free_count;
113#endif
114
115	if (!vaddr) {
116#if DRM_DEBUG_MEMORY
117		DRM_MEM_ERROR(area, "Attempt to free address 0\n");
118#endif
119	} else {
120		pci_free_consistent(dev->pdev, size, vaddr, busaddr);
121	}
122
123#if DRM_DEBUG_MEMORY
124	spin_lock(&drm_mem_lock);
125	free_count = ++drm_mem_stats[area].free_count;
126	alloc_count = drm_mem_stats[area].succeed_count;
127	drm_mem_stats[area].bytes_freed += size;
128	drm_ram_used -= size;
129	spin_unlock(&drm_mem_lock);
130	if (free_count > alloc_count) {
131		DRM_MEM_ERROR(area,
132			      "Excess frees: %d frees, %d allocs\n",
133			      free_count, alloc_count);
134	}
135#endif
136
137}
138EXPORT_SYMBOL(drm_pci_free);
139
140/*@}*/