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/dma-mapping.h> 41 #include "drmP.h" 42 43 /**********************************************************************/ 44 /** \name PCI memory */ 45 /*@{*/ 46 47 /** 48 * \brief Allocate a PCI consistent memory block, for DMA. 49 */ 50 drm_dma_handle_t *drm_pci_alloc(struct drm_device * dev, size_t size, size_t align, 51 dma_addr_t maxaddr) 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 if (pci_set_dma_mask(dev->pdev, maxaddr) != 0) { 67 DRM_ERROR("Setting pci dma mask failed\n"); 68 return NULL; 69 } 70 71 dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL); 72 if (!dmah) 73 return NULL; 74 75 dmah->size = size; 76 dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size, &dmah->busaddr, GFP_KERNEL | __GFP_COMP); 77 78 if (dmah->vaddr == NULL) { 79 kfree(dmah); 80 return NULL; 81 } 82 83 memset(dmah->vaddr, 0, size); 84 85 /* XXX - Is virt_to_page() legal for consistent mem? */ 86 /* Reserve */ 87 for (addr = (unsigned long)dmah->vaddr, sz = size; 88 sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) { 89 SetPageReserved(virt_to_page(addr)); 90 } 91 92 return dmah; 93 } 94 95 EXPORT_SYMBOL(drm_pci_alloc); 96 97 /** 98 * \brief Free a PCI consistent memory block without freeing its descriptor. 99 * 100 * This function is for internal use in the Linux-specific DRM core code. 101 */ 102 void __drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah) 103 { 104 #if 1 105 unsigned long addr; 106 size_t sz; 107 #endif 108 109 if (dmah->vaddr) { 110 /* XXX - Is virt_to_page() legal for consistent mem? */ 111 /* Unreserve */ 112 for (addr = (unsigned long)dmah->vaddr, sz = dmah->size; 113 sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) { 114 ClearPageReserved(virt_to_page(addr)); 115 } 116 dma_free_coherent(&dev->pdev->dev, dmah->size, dmah->vaddr, 117 dmah->busaddr); 118 } 119 } 120 121 /** 122 * \brief Free a PCI consistent memory block 123 */ 124 void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah) 125 { 126 __drm_pci_free(dev, dmah); 127 kfree(dmah); 128 } 129 130 EXPORT_SYMBOL(drm_pci_free); 131 132 /*@}*/ 133