Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | * |
Jan Engelhardt | 96de0e2 | 2007-10-19 23:21:04 +0200 | [diff] [blame] | 11 | * \author José Fonseca <jrfonseca@tungstengraphics.com> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | * \author Leif Delgass <ldelgass@retinalburn.net> |
| 13 | */ |
| 14 | |
| 15 | /* |
Jan Engelhardt | 96de0e2 | 2007-10-19 23:21:04 +0200 | [diff] [blame] | 16 | * Copyright 2003 José Fonseca. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Dave Airlie | 195b3a2 | 2006-04-05 18:12:18 +1000 | [diff] [blame] | 40 | #include <linux/dma-mapping.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | #include "drmP.h" |
| 42 | |
| 43 | /**********************************************************************/ |
| 44 | /** \name PCI memory */ |
| 45 | /*@{*/ |
| 46 | |
| 47 | /** |
| 48 | * \brief Allocate a PCI consistent memory block, for DMA. |
| 49 | */ |
Zhenyu Wang | e6be8d9 | 2010-01-05 11:25:05 +0800 | [diff] [blame] | 50 | drm_dma_handle_t *drm_pci_alloc(struct drm_device * dev, size_t size, size_t align) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | { |
Dave Airlie | 9c8da5e | 2005-07-10 15:38:56 +1000 | [diff] [blame] | 52 | drm_dma_handle_t *dmah; |
Dave Airlie | ddf19b9 | 2006-03-19 18:56:12 +1100 | [diff] [blame] | 53 | #if 1 |
| 54 | unsigned long addr; |
| 55 | size_t sz; |
| 56 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | |
| 58 | /* pci_alloc_consistent only guarantees alignment to the smallest |
| 59 | * PAGE_SIZE order which is greater than or equal to the requested size. |
| 60 | * Return NULL here for now to make sure nobody tries for larger alignment |
| 61 | */ |
| 62 | if (align > size) |
| 63 | return NULL; |
| 64 | |
Dave Airlie | 9c8da5e | 2005-07-10 15:38:56 +1000 | [diff] [blame] | 65 | dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL); |
| 66 | if (!dmah) |
| 67 | return NULL; |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 68 | |
Dave Airlie | 9c8da5e | 2005-07-10 15:38:56 +1000 | [diff] [blame] | 69 | dmah->size = size; |
Dave Airlie | ddf19b9 | 2006-03-19 18:56:12 +1100 | [diff] [blame] | 70 | dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size, &dmah->busaddr, GFP_KERNEL | __GFP_COMP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | |
Dave Airlie | 9c8da5e | 2005-07-10 15:38:56 +1000 | [diff] [blame] | 72 | if (dmah->vaddr == NULL) { |
| 73 | kfree(dmah); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | return NULL; |
Dave Airlie | 9c8da5e | 2005-07-10 15:38:56 +1000 | [diff] [blame] | 75 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | |
Dave Airlie | 9c8da5e | 2005-07-10 15:38:56 +1000 | [diff] [blame] | 77 | memset(dmah->vaddr, 0, size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | |
Dave Airlie | ddf19b9 | 2006-03-19 18:56:12 +1100 | [diff] [blame] | 79 | /* XXX - Is virt_to_page() legal for consistent mem? */ |
| 80 | /* Reserve */ |
| 81 | for (addr = (unsigned long)dmah->vaddr, sz = size; |
| 82 | sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) { |
| 83 | SetPageReserved(virt_to_page(addr)); |
| 84 | } |
| 85 | |
Dave Airlie | 9c8da5e | 2005-07-10 15:38:56 +1000 | [diff] [blame] | 86 | return dmah; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | } |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 88 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | EXPORT_SYMBOL(drm_pci_alloc); |
| 90 | |
| 91 | /** |
Dave Airlie | ddf19b9 | 2006-03-19 18:56:12 +1100 | [diff] [blame] | 92 | * \brief Free a PCI consistent memory block without freeing its descriptor. |
Dave Airlie | 9c8da5e | 2005-07-10 15:38:56 +1000 | [diff] [blame] | 93 | * |
| 94 | * This function is for internal use in the Linux-specific DRM core code. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | */ |
Dave Airlie | 84b1fd1 | 2007-07-11 15:53:27 +1000 | [diff] [blame] | 96 | void __drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | { |
Dave Airlie | ddf19b9 | 2006-03-19 18:56:12 +1100 | [diff] [blame] | 98 | #if 1 |
| 99 | unsigned long addr; |
| 100 | size_t sz; |
| 101 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | |
Eric Anholt | 9a298b2 | 2009-03-24 12:23:04 -0700 | [diff] [blame] | 103 | if (dmah->vaddr) { |
Dave Airlie | ddf19b9 | 2006-03-19 18:56:12 +1100 | [diff] [blame] | 104 | /* XXX - Is virt_to_page() legal for consistent mem? */ |
| 105 | /* Unreserve */ |
| 106 | for (addr = (unsigned long)dmah->vaddr, sz = dmah->size; |
| 107 | sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) { |
| 108 | ClearPageReserved(virt_to_page(addr)); |
| 109 | } |
| 110 | dma_free_coherent(&dev->pdev->dev, dmah->size, dmah->vaddr, |
| 111 | dmah->busaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | } |
Dave Airlie | 9c8da5e | 2005-07-10 15:38:56 +1000 | [diff] [blame] | 114 | |
| 115 | /** |
| 116 | * \brief Free a PCI consistent memory block |
| 117 | */ |
Dave Airlie | 84b1fd1 | 2007-07-11 15:53:27 +1000 | [diff] [blame] | 118 | void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah) |
Dave Airlie | 9c8da5e | 2005-07-10 15:38:56 +1000 | [diff] [blame] | 119 | { |
| 120 | __drm_pci_free(dev, dmah); |
| 121 | kfree(dmah); |
| 122 | } |
Dave Airlie | b5e89ed | 2005-09-25 14:28:13 +1000 | [diff] [blame] | 123 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | EXPORT_SYMBOL(drm_pci_free); |
| 125 | |
| 126 | /*@}*/ |