127 lines
3.6 KiB
C
127 lines
3.6 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 José 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 José 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 <linux/dma-mapping.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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drm_dma_handle_t *drm_pci_alloc(struct drm_device * dev, size_t size, size_t align)
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{
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drm_dma_handle_t *dmah;
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#if 1
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unsigned long addr;
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size_t sz;
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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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dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL);
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if (!dmah)
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return NULL;
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dmah->size = size;
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dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size, &dmah->busaddr, GFP_KERNEL | __GFP_COMP);
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if (dmah->vaddr == NULL) {
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kfree(dmah);
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return NULL;
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}
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memset(dmah->vaddr, 0, size);
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/* XXX - Is virt_to_page() legal for consistent mem? */
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/* Reserve */
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for (addr = (unsigned long)dmah->vaddr, sz = size;
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sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
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SetPageReserved(virt_to_page(addr));
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}
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return dmah;
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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 without freeing its descriptor.
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*
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* This function is for internal use in the Linux-specific DRM core code.
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*/
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void __drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
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{
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#if 1
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unsigned long addr;
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size_t sz;
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#endif
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if (dmah->vaddr) {
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/* XXX - Is virt_to_page() legal for consistent mem? */
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/* Unreserve */
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for (addr = (unsigned long)dmah->vaddr, sz = dmah->size;
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sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
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ClearPageReserved(virt_to_page(addr));
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}
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dma_free_coherent(&dev->pdev->dev, dmah->size, dmah->vaddr,
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dmah->busaddr);
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}
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}
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/**
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* \brief Free a PCI consistent memory block
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*/
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void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
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{
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__drm_pci_free(dev, dmah);
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kfree(dmah);
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}
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EXPORT_SYMBOL(drm_pci_free);
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/*@}*/
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