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 drm_sg_alloc(struct drm_device *dev, void *data, 36 struct drm_file *file_priv) 37 { 38 struct drm_scatter_gather *request = data; 39 struct drm_sg_mem *entry; 40 vm_size_t size; 41 vm_pindex_t pindex; 42 43 if (dev->sg) 44 return -EINVAL; 45 46 DRM_DEBUG("request size=%ld\n", request->size); 47 48 entry = kmalloc(sizeof(*entry), M_DRM, M_WAITOK | M_ZERO); 49 50 size = round_page(request->size); 51 entry->pages = OFF_TO_IDX(size); 52 entry->busaddr = kmalloc(entry->pages * sizeof(*entry->busaddr), 53 M_DRM, M_WAITOK | M_ZERO); 54 55 entry->vaddr = kmem_alloc_attr(&kernel_map, size, M_WAITOK | M_ZERO, 56 0, BUS_SPACE_MAXADDR_32BIT, VM_MEMATTR_WRITE_COMBINING); 57 if (entry->vaddr == 0) { 58 drm_sg_cleanup(entry); 59 return (-ENOMEM); 60 } 61 62 for(pindex = 0; pindex < entry->pages; pindex++) { 63 entry->busaddr[pindex] = 64 vtophys(entry->vaddr + IDX_TO_OFF(pindex)); 65 } 66 67 DRM_LOCK(dev); 68 if (dev->sg) { 69 DRM_UNLOCK(dev); 70 drm_sg_cleanup(entry); 71 return (-EINVAL); 72 } 73 dev->sg = entry; 74 DRM_UNLOCK(dev); 75 76 request->handle = entry->vaddr; 77 78 DRM_DEBUG("allocated %ju pages @ 0x%08jx, contents=%08lx\n", 79 entry->pages, (uintmax_t)entry->vaddr, 80 *(unsigned long *)entry->vaddr); 81 82 return (0); 83 } 84 85 void 86 drm_sg_cleanup(struct drm_sg_mem *entry) 87 { 88 if (entry == NULL) 89 return; 90 91 if (entry->vaddr != 0) 92 kmem_free(&kernel_map, entry->vaddr, IDX_TO_OFF(entry->pages)); 93 94 drm_free(entry->busaddr, M_DRM); 95 drm_free(entry, M_DRM); 96 97 return; 98 } 99 100 int 101 drm_sg_free(struct drm_device *dev, void *data, struct drm_file *file_priv) 102 { 103 struct drm_scatter_gather *request = data; 104 struct drm_sg_mem *entry; 105 106 DRM_LOCK(dev); 107 entry = dev->sg; 108 dev->sg = NULL; 109 DRM_UNLOCK(dev); 110 111 if (!entry || entry->vaddr != request->handle) 112 return (-EINVAL); 113 114 DRM_DEBUG("free 0x%jx\n", (uintmax_t)entry->vaddr); 115 116 drm_sg_cleanup(entry); 117 118 return (0); 119 } 120