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 #include "drm_legacy.h" 35 36 #include <vm/vm_kern.h> 37 38 static void drm_sg_cleanup(struct drm_sg_mem * entry) 39 { 40 if (entry == NULL) 41 return; 42 43 if (entry->vaddr != 0) 44 kmem_free(kernel_map, entry->vaddr, IDX_TO_OFF(entry->pages)); 45 46 kfree(entry->busaddr); 47 kfree(entry); 48 } 49 50 void drm_legacy_sg_cleanup(struct drm_device *dev) 51 { 52 if (drm_core_check_feature(dev, DRIVER_SG) && dev->sg && 53 drm_core_check_feature(dev, DRIVER_LEGACY)) { 54 drm_sg_cleanup(dev->sg); 55 dev->sg = NULL; 56 } 57 } 58 59 int drm_legacy_sg_alloc(struct drm_device *dev, void *data, 60 struct drm_file *file_priv) 61 { 62 struct drm_scatter_gather *request = data; 63 struct drm_sg_mem *entry; 64 vm_size_t size; 65 vm_pindex_t pindex; 66 67 DRM_DEBUG("\n"); 68 69 if (!drm_core_check_feature(dev, DRIVER_LEGACY)) 70 return -EINVAL; 71 72 if (dev->sg) 73 return -EINVAL; 74 75 DRM_DEBUG("request size=%ld\n", request->size); 76 77 entry = kmalloc(sizeof(*entry), M_DRM, M_WAITOK | M_ZERO); 78 79 size = round_page(request->size); 80 entry->pages = OFF_TO_IDX(size); 81 entry->busaddr = kmalloc(entry->pages * sizeof(*entry->busaddr), 82 M_DRM, M_WAITOK | M_ZERO); 83 84 entry->vaddr = kmem_alloc_attr(kernel_map, size, 85 VM_SUBSYS_DRM_SCAT, M_WAITOK | M_ZERO, 86 0, BUS_SPACE_MAXADDR_32BIT, 87 VM_MEMATTR_WRITE_COMBINING); 88 if (entry->vaddr == 0) { 89 drm_sg_cleanup(entry); 90 return (-ENOMEM); 91 } 92 93 for(pindex = 0; pindex < entry->pages; pindex++) { 94 entry->busaddr[pindex] = 95 vtophys(entry->vaddr + IDX_TO_OFF(pindex)); 96 } 97 98 DRM_LOCK(dev); 99 if (dev->sg) { 100 DRM_UNLOCK(dev); 101 drm_sg_cleanup(entry); 102 return (-EINVAL); 103 } 104 dev->sg = entry; 105 DRM_UNLOCK(dev); 106 107 request->handle = entry->vaddr; 108 109 DRM_DEBUG("allocated %ju pages @ 0x%08jx, contents=%08lx\n", 110 entry->pages, (uintmax_t)entry->vaddr, 111 *(unsigned long *)entry->vaddr); 112 113 return (0); 114 } 115 116 int drm_legacy_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_LEGACY)) 123 return -EINVAL; 124 125 if (!drm_core_check_feature(dev, DRIVER_SG)) 126 return -EINVAL; 127 128 entry = dev->sg; 129 dev->sg = NULL; 130 131 if (!entry || entry->vaddr != request->handle) 132 return -EINVAL; 133 134 DRM_DEBUG("free 0x%jx\n", (uintmax_t)entry->vaddr); 135 136 drm_sg_cleanup(entry); 137 138 return 0; 139 } 140