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 static void drm_sg_cleanup(struct drm_sg_mem * entry) 37 { 38 if (entry == NULL) 39 return; 40 41 if (entry->vaddr != 0) 42 kmem_free(&kernel_map, entry->vaddr, IDX_TO_OFF(entry->pages)); 43 44 kfree(entry->busaddr); 45 kfree(entry); 46 } 47 48 void drm_legacy_sg_cleanup(struct drm_device *dev) 49 { 50 if (drm_core_check_feature(dev, DRIVER_SG) && dev->sg && 51 !drm_core_check_feature(dev, DRIVER_MODESET)) { 52 drm_sg_cleanup(dev->sg); 53 dev->sg = NULL; 54 } 55 } 56 57 int drm_legacy_sg_alloc(struct drm_device *dev, void *data, 58 struct drm_file *file_priv) 59 { 60 struct drm_scatter_gather *request = data; 61 struct drm_sg_mem *entry; 62 vm_size_t size; 63 vm_pindex_t pindex; 64 65 if (dev->sg) 66 return -EINVAL; 67 68 DRM_DEBUG("request size=%ld\n", request->size); 69 70 entry = kmalloc(sizeof(*entry), M_DRM, M_WAITOK | M_ZERO); 71 72 size = round_page(request->size); 73 entry->pages = OFF_TO_IDX(size); 74 entry->busaddr = kmalloc(entry->pages * sizeof(*entry->busaddr), 75 M_DRM, M_WAITOK | M_ZERO); 76 77 entry->vaddr = kmem_alloc_attr(&kernel_map, size, 78 VM_SUBSYS_DRM_SCAT, M_WAITOK | M_ZERO, 79 0, BUS_SPACE_MAXADDR_32BIT, 80 VM_MEMATTR_WRITE_COMBINING); 81 if (entry->vaddr == 0) { 82 drm_sg_cleanup(entry); 83 return (-ENOMEM); 84 } 85 86 for(pindex = 0; pindex < entry->pages; pindex++) { 87 entry->busaddr[pindex] = 88 vtophys(entry->vaddr + IDX_TO_OFF(pindex)); 89 } 90 91 DRM_LOCK(dev); 92 if (dev->sg) { 93 DRM_UNLOCK(dev); 94 drm_sg_cleanup(entry); 95 return (-EINVAL); 96 } 97 dev->sg = entry; 98 DRM_UNLOCK(dev); 99 100 request->handle = entry->vaddr; 101 102 DRM_DEBUG("allocated %ju pages @ 0x%08jx, contents=%08lx\n", 103 entry->pages, (uintmax_t)entry->vaddr, 104 *(unsigned long *)entry->vaddr); 105 106 return (0); 107 } 108 109 int drm_legacy_sg_free(struct drm_device *dev, void *data, 110 struct drm_file *file_priv) 111 { 112 struct drm_scatter_gather *request = data; 113 struct drm_sg_mem *entry; 114 115 DRM_LOCK(dev); 116 entry = dev->sg; 117 dev->sg = NULL; 118 DRM_UNLOCK(dev); 119 120 if (!entry || entry->vaddr != request->handle) 121 return (-EINVAL); 122 123 DRM_DEBUG("free 0x%jx\n", (uintmax_t)entry->vaddr); 124 125 drm_sg_cleanup(entry); 126 127 return (0); 128 } 129