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 José Fonseca <jrfonseca@tungstengraphics.com> 12 * \author Leif Delgass <ldelgass@retinalburn.net> 13 */ 14 15 /* 16 * Copyright 2003 José 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 <linux/slab.h> 41 #include <linux/dma-mapping.h> 42 #include "drmP.h" 43 44 /**********************************************************************/ 45 /** \name PCI memory */ 46 /*@{*/ 47 48 /** 49 * \brief Allocate a PCI consistent memory block, for DMA. 50 */ 51 drm_dma_handle_t *drm_pci_alloc(struct drm_device * dev, size_t size, size_t align) 52 { 53 drm_dma_handle_t *dmah; 54 #if 1 55 unsigned long addr; 56 size_t sz; 57 #endif 58 59 /* pci_alloc_consistent only guarantees alignment to the smallest 60 * PAGE_SIZE order which is greater than or equal to the requested size. 61 * Return NULL here for now to make sure nobody tries for larger alignment 62 */ 63 if (align > size) 64 return NULL; 65 66 dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL); 67 if (!dmah) 68 return NULL; 69 70 dmah->size = size; 71 dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size, &dmah->busaddr, GFP_KERNEL | __GFP_COMP); 72 73 if (dmah->vaddr == NULL) { 74 kfree(dmah); 75 return NULL; 76 } 77 78 memset(dmah->vaddr, 0, size); 79 80 /* XXX - Is virt_to_page() legal for consistent mem? */ 81 /* Reserve */ 82 for (addr = (unsigned long)dmah->vaddr, sz = size; 83 sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) { 84 SetPageReserved(virt_to_page(addr)); 85 } 86 87 return dmah; 88 } 89 90 EXPORT_SYMBOL(drm_pci_alloc); 91 92 /** 93 * \brief Free a PCI consistent memory block without freeing its descriptor. 94 * 95 * This function is for internal use in the Linux-specific DRM core code. 96 */ 97 void __drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah) 98 { 99 #if 1 100 unsigned long addr; 101 size_t sz; 102 #endif 103 104 if (dmah->vaddr) { 105 /* XXX - Is virt_to_page() legal for consistent mem? */ 106 /* Unreserve */ 107 for (addr = (unsigned long)dmah->vaddr, sz = dmah->size; 108 sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) { 109 ClearPageReserved(virt_to_page(addr)); 110 } 111 dma_free_coherent(&dev->pdev->dev, dmah->size, dmah->vaddr, 112 dmah->busaddr); 113 } 114 } 115 116 /** 117 * \brief Free a PCI consistent memory block 118 */ 119 void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah) 120 { 121 __drm_pci_free(dev, dmah); 122 kfree(dmah); 123 } 124 125 EXPORT_SYMBOL(drm_pci_free); 126 127 /*@}*/ 128