141 строка
3.8 KiB
C
141 строка
3.8 KiB
C
/* drm_pci.h -- PCI DMA memory management wrappers for DRM -*- linux-c -*- */
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/**
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* \file drm_pci.c
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* \brief Functions and ioctls to manage PCI memory
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*
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* \warning These interfaces aren't stable yet.
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*
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* \todo Implement the remaining ioctl's for the PCI pools.
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* \todo The wrappers here are so thin that they would be better off inlined..
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*
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* \author Jose Fonseca <jrfonseca@tungstengraphics.com>
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* \author Leif Delgass <ldelgass@retinalburn.net>
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*/
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/*
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* Copyright 2003 Jos<6F>Fonseca.
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* Copyright 2003 Leif Delgass.
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <linux/pci.h>
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#include "drmP.h"
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/**********************************************************************/
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/** \name PCI memory */
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/*@{*/
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/**
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* \brief Allocate a PCI consistent memory block, for DMA.
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*/
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void *drm_pci_alloc(drm_device_t * dev, size_t size, size_t align,
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dma_addr_t maxaddr, dma_addr_t * busaddr)
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{
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void *address;
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#if DRM_DEBUG_MEMORY
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int area = DRM_MEM_DMA;
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spin_lock(&drm_mem_lock);
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if ((drm_ram_used >> PAGE_SHIFT)
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> (DRM_RAM_PERCENT * drm_ram_available) / 100) {
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spin_unlock(&drm_mem_lock);
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return 0;
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}
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spin_unlock(&drm_mem_lock);
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#endif
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/* pci_alloc_consistent only guarantees alignment to the smallest
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* PAGE_SIZE order which is greater than or equal to the requested size.
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* Return NULL here for now to make sure nobody tries for larger alignment
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*/
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if (align > size)
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return NULL;
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if (pci_set_dma_mask(dev->pdev, maxaddr) != 0) {
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DRM_ERROR("Setting pci dma mask failed\n");
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return NULL;
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}
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address = pci_alloc_consistent(dev->pdev, size, busaddr);
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#if DRM_DEBUG_MEMORY
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if (address == NULL) {
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spin_lock(&drm_mem_lock);
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++drm_mem_stats[area].fail_count;
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spin_unlock(&drm_mem_lock);
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return NULL;
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}
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spin_lock(&drm_mem_lock);
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++drm_mem_stats[area].succeed_count;
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drm_mem_stats[area].bytes_allocated += size;
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drm_ram_used += size;
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spin_unlock(&drm_mem_lock);
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#else
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if (address == NULL)
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return NULL;
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#endif
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memset(address, 0, size);
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return address;
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}
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EXPORT_SYMBOL(drm_pci_alloc);
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/**
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* \brief Free a PCI consistent memory block.
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*/
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void
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drm_pci_free(drm_device_t * dev, size_t size, void *vaddr, dma_addr_t busaddr)
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{
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#if DRM_DEBUG_MEMORY
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int area = DRM_MEM_DMA;
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int alloc_count;
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int free_count;
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#endif
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if (!vaddr) {
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#if DRM_DEBUG_MEMORY
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DRM_MEM_ERROR(area, "Attempt to free address 0\n");
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#endif
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} else {
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pci_free_consistent(dev->pdev, size, vaddr, busaddr);
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}
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#if DRM_DEBUG_MEMORY
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spin_lock(&drm_mem_lock);
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free_count = ++drm_mem_stats[area].free_count;
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alloc_count = drm_mem_stats[area].succeed_count;
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drm_mem_stats[area].bytes_freed += size;
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drm_ram_used -= size;
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spin_unlock(&drm_mem_lock);
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if (free_count > alloc_count) {
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DRM_MEM_ERROR(area,
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"Excess frees: %d frees, %d allocs\n",
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free_count, alloc_count);
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}
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#endif
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}
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EXPORT_SYMBOL(drm_pci_free);
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/*@}*/
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