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 25 #include <sys/cdefs.h> 26 __FBSDID("$FreeBSD$"); 27 28 /** @file drm_scatter.c 29 * Allocation of memory for scatter-gather mappings by the graphics chip. 30 * The memory allocated here is then made into an aperture in the card 31 * by mapping the pages into the GART. 32 */ 33 34 #include <dev/drm2/drmP.h> 35 36 #define DEBUG_SCATTER 0 37 38 static inline vm_offset_t drm_vmalloc_dma(vm_size_t size) 39 { 40 return kmem_alloc_attr(kernel_arena, size, M_NOWAIT | M_ZERO, 41 0, BUS_SPACE_MAXADDR_32BIT, VM_MEMATTR_WRITE_COMBINING); 42 } 43 44 void drm_sg_cleanup(struct drm_sg_mem * entry) 45 { 46 if (entry == NULL) 47 return; 48 49 if (entry->vaddr != 0) 50 kmem_free(kernel_arena, entry->vaddr, IDX_TO_OFF(entry->pages)); 51 52 free(entry->busaddr, DRM_MEM_SGLISTS); 53 free(entry, DRM_MEM_DRIVER); 54 } 55 56 int drm_sg_alloc(struct drm_device *dev, struct drm_scatter_gather * request) 57 { 58 struct drm_sg_mem *entry; 59 vm_size_t size; 60 vm_pindex_t pindex; 61 62 DRM_DEBUG("\n"); 63 64 if (!drm_core_check_feature(dev, DRIVER_SG)) 65 return -EINVAL; 66 67 if (dev->sg) 68 return -EINVAL; 69 70 entry = malloc(sizeof(*entry), DRM_MEM_DRIVER, M_NOWAIT | M_ZERO); 71 if (!entry) 72 return -ENOMEM; 73 74 DRM_DEBUG("request size=%ld\n", request->size); 75 76 size = round_page(request->size); 77 entry->pages = atop(size); 78 entry->busaddr = malloc(entry->pages * sizeof(*entry->busaddr), 79 DRM_MEM_SGLISTS, M_NOWAIT | M_ZERO); 80 if (!entry->busaddr) { 81 free(entry, DRM_MEM_DRIVER); 82 return -ENOMEM; 83 } 84 85 entry->vaddr = drm_vmalloc_dma(size); 86 if (entry->vaddr == 0) { 87 free(entry->busaddr, DRM_MEM_DRIVER); 88 free(entry, DRM_MEM_DRIVER); 89 return -ENOMEM; 90 } 91 92 for (pindex = 0; pindex < entry->pages; pindex++) { 93 entry->busaddr[pindex] = 94 vtophys(entry->vaddr + IDX_TO_OFF(pindex)); 95 } 96 97 request->handle = entry->vaddr; 98 99 dev->sg = entry; 100 101 DRM_DEBUG("allocated %ju pages @ 0x%08zx, contents=%08lx\n", 102 entry->pages, entry->vaddr, *(unsigned long *)entry->vaddr); 103 104 return 0; 105 } 106 107 int drm_sg_alloc_ioctl(struct drm_device *dev, void *data, 108 struct drm_file *file_priv) 109 { 110 struct drm_scatter_gather *request = data; 111 112 return drm_sg_alloc(dev, request); 113 114 } 115 116 int drm_sg_free(struct drm_device *dev, void *data, 117 struct drm_file *file_priv) 118 { 119 struct drm_scatter_gather *request = data; 120 struct drm_sg_mem *entry; 121 122 if (!drm_core_check_feature(dev, DRIVER_SG)) 123 return -EINVAL; 124 125 entry = dev->sg; 126 dev->sg = NULL; 127 128 if (!entry || entry->vaddr != request->handle) 129 return -EINVAL; 130 131 DRM_DEBUG("free 0x%zx\n", entry->vaddr); 132 133 drm_sg_cleanup(entry); 134 135 return 0; 136 } 137