1 /*- 2 * Copyright (c) 2009 Robert C. Noland III <rnoland@FreeBSD.org> 3 * All Rights Reserved. 4 * 5 * Permission is hereby granted, free of charge, to any person obtaining a 6 * copy of this software and associated documentation files (the "Software"), 7 * to deal in the Software without restriction, including without limitation 8 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 9 * and/or sell copies of the Software, and to permit persons to whom the 10 * Software is furnished to do so, subject to the following conditions: 11 * 12 * The above copyright notice and this permission notice (including the next 13 * paragraph) shall be included in all copies or substantial portions of the 14 * Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 22 * DEALINGS IN THE SOFTWARE. 23 * 24 * $FreeBSD: src/sys/dev/drm2/drm_scatter.c,v 1.1 2012/05/22 11:07:44 kib Exp $ 25 */ 26 27 /** @file drm_scatter.c 28 * Allocation of memory for scatter-gather mappings by the graphics chip. 29 * The memory allocated here is then made into an aperture in the card 30 * by mapping the pages into the GART. 31 */ 32 33 #include <drm/drmP.h> 34 35 int 36 drm_sg_alloc(struct drm_device *dev, struct drm_scatter_gather *request) 37 { 38 struct drm_sg_mem *entry; 39 vm_size_t size; 40 vm_pindex_t pindex; 41 42 if (dev->sg) 43 return EINVAL; 44 45 DRM_DEBUG("request size=%ld\n", request->size); 46 47 entry = kmalloc(sizeof(*entry), M_DRM, M_WAITOK | M_ZERO); 48 49 size = round_page(request->size); 50 entry->pages = OFF_TO_IDX(size); 51 entry->busaddr = kmalloc(entry->pages * sizeof(*entry->busaddr), 52 M_DRM, M_WAITOK | M_ZERO); 53 54 entry->vaddr = kmem_alloc_attr(&kernel_map, size, M_WAITOK | M_ZERO, 55 0, BUS_SPACE_MAXADDR_32BIT, VM_MEMATTR_WRITE_COMBINING); 56 if (entry->vaddr == 0) { 57 drm_sg_cleanup(entry); 58 return (ENOMEM); 59 } 60 61 for(pindex = 0; pindex < entry->pages; pindex++) { 62 entry->busaddr[pindex] = 63 vtophys(entry->vaddr + IDX_TO_OFF(pindex)); 64 } 65 66 DRM_LOCK(dev); 67 if (dev->sg) { 68 DRM_UNLOCK(dev); 69 drm_sg_cleanup(entry); 70 return (EINVAL); 71 } 72 dev->sg = entry; 73 DRM_UNLOCK(dev); 74 75 request->handle = entry->vaddr; 76 77 DRM_DEBUG("allocated %ju pages @ 0x%08jx, contents=%08lx\n", 78 entry->pages, (uintmax_t)entry->vaddr, 79 *(unsigned long *)entry->vaddr); 80 81 return (0); 82 } 83 84 int 85 drm_sg_alloc_ioctl(struct drm_device *dev, void *data, 86 struct drm_file *file_priv) 87 { 88 struct drm_scatter_gather *request = data; 89 90 DRM_DEBUG("\n"); 91 92 return (drm_sg_alloc(dev, request)); 93 } 94 95 void 96 drm_sg_cleanup(struct drm_sg_mem *entry) 97 { 98 if (entry == NULL) 99 return; 100 101 if (entry->vaddr != 0) 102 kmem_free(&kernel_map, entry->vaddr, IDX_TO_OFF(entry->pages)); 103 104 drm_free(entry->busaddr, M_DRM); 105 drm_free(entry, M_DRM); 106 107 return; 108 } 109 110 int 111 drm_sg_free(struct drm_device *dev, void *data, struct drm_file *file_priv) 112 { 113 struct drm_scatter_gather *request = data; 114 struct drm_sg_mem *entry; 115 116 DRM_LOCK(dev); 117 entry = dev->sg; 118 dev->sg = NULL; 119 DRM_UNLOCK(dev); 120 121 if (!entry || entry->vaddr != request->handle) 122 return (EINVAL); 123 124 DRM_DEBUG("free 0x%jx\n", (uintmax_t)entry->vaddr); 125 126 drm_sg_cleanup(entry); 127 128 return (0); 129 } 130