drm_gem_cma_helper.c revision 1.1
1 /* $NetBSD: drm_gem_cma_helper.c,v 1.1 2017/12/26 14:53:12 jmcneill Exp $ */ 2 3 /*- 4 * Copyright (c) 2015-2017 Jared McNeill <jmcneill (at) invisible.ca> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: drm_gem_cma_helper.c,v 1.1 2017/12/26 14:53:12 jmcneill Exp $"); 31 32 #include <drm/drmP.h> 33 #include <drm/drm_gem_cma_helper.h> 34 35 #include <uvm/uvm.h> 36 37 struct drm_gem_cma_object * 38 drm_gem_cma_create(struct drm_device *ddev, unsigned int size) 39 { 40 struct drm_gem_cma_object *obj; 41 int error, nsegs; 42 43 obj = kmem_zalloc(sizeof(*obj), KM_SLEEP); 44 obj->dmat = ddev->bus_dmat; 45 obj->dmasize = size; 46 47 error = bus_dmamem_alloc(obj->dmat, obj->dmasize, PAGE_SIZE, 0, 48 obj->dmasegs, 1, &nsegs, BUS_DMA_WAITOK); 49 if (error) 50 goto failed; 51 error = bus_dmamem_map(obj->dmat, obj->dmasegs, nsegs, 52 obj->dmasize, &obj->vaddr, BUS_DMA_WAITOK | BUS_DMA_COHERENT); 53 if (error) 54 goto free; 55 error = bus_dmamap_create(obj->dmat, obj->dmasize, 1, 56 obj->dmasize, 0, BUS_DMA_WAITOK, &obj->dmamap); 57 if (error) 58 goto unmap; 59 error = bus_dmamap_load(obj->dmat, obj->dmamap, obj->vaddr, 60 obj->dmasize, NULL, BUS_DMA_WAITOK); 61 if (error) 62 goto destroy; 63 64 memset(obj->vaddr, 0, obj->dmasize); 65 66 drm_gem_private_object_init(ddev, &obj->base, size); 67 68 return obj; 69 70 destroy: 71 bus_dmamap_destroy(obj->dmat, obj->dmamap); 72 unmap: 73 bus_dmamem_unmap(obj->dmat, obj->vaddr, obj->dmasize); 74 free: 75 bus_dmamem_free(obj->dmat, obj->dmasegs, nsegs); 76 failed: 77 kmem_free(obj, sizeof(*obj)); 78 79 return NULL; 80 } 81 82 static void 83 drm_gem_cma_obj_free(struct drm_gem_cma_object *obj) 84 { 85 bus_dmamap_unload(obj->dmat, obj->dmamap); 86 bus_dmamap_destroy(obj->dmat, obj->dmamap); 87 bus_dmamem_unmap(obj->dmat, obj->vaddr, obj->dmasize); 88 bus_dmamem_free(obj->dmat, obj->dmasegs, 1); 89 kmem_free(obj, sizeof(*obj)); 90 } 91 92 void 93 drm_gem_cma_free_object(struct drm_gem_object *gem_obj) 94 { 95 struct drm_gem_cma_object *obj = to_drm_gem_cma_obj(gem_obj); 96 97 drm_gem_free_mmap_offset(gem_obj); 98 drm_gem_object_release(gem_obj); 99 drm_gem_cma_obj_free(obj); 100 } 101 102 int 103 drm_gem_cma_dumb_create(struct drm_file *file_priv, struct drm_device *ddev, 104 struct drm_mode_create_dumb *args) 105 { 106 struct drm_gem_cma_object *obj; 107 uint32_t handle; 108 int error; 109 110 args->pitch = args->width * ((args->bpp + 7) / 8); 111 args->size = args->pitch * args->height; 112 args->size = roundup(args->size, PAGE_SIZE); 113 args->handle = 0; 114 115 obj = drm_gem_cma_create(ddev, args->size); 116 if (obj == NULL) 117 return -ENOMEM; 118 119 error = drm_gem_handle_create(file_priv, &obj->base, &handle); 120 drm_gem_object_unreference_unlocked(&obj->base); 121 if (error) { 122 drm_gem_cma_obj_free(obj); 123 return error; 124 } 125 126 args->handle = handle; 127 128 return 0; 129 } 130 131 int 132 drm_gem_cma_dumb_map_offset(struct drm_file *file_priv, struct drm_device *ddev, 133 uint32_t handle, uint64_t *offset) 134 { 135 struct drm_gem_object *gem_obj; 136 struct drm_gem_cma_object *obj; 137 int error; 138 139 gem_obj = drm_gem_object_lookup(ddev, file_priv, handle); 140 if (gem_obj == NULL) 141 return -ENOENT; 142 143 obj = to_drm_gem_cma_obj(gem_obj); 144 145 if (drm_vma_node_has_offset(&obj->base.vma_node) == 0) { 146 error = drm_gem_create_mmap_offset(&obj->base); 147 if (error) 148 goto done; 149 } else { 150 error = 0; 151 } 152 153 *offset = drm_vma_node_offset_addr(&obj->base.vma_node); 154 155 done: 156 drm_gem_object_unreference_unlocked(&obj->base); 157 158 return error; 159 } 160 161 static int 162 drm_gem_cma_fault(struct uvm_faultinfo *ufi, vaddr_t vaddr, 163 struct vm_page **pps, int npages, int centeridx, vm_prot_t access_type, 164 int flags) 165 { 166 struct vm_map_entry *entry = ufi->entry; 167 struct uvm_object *uobj = entry->object.uvm_obj; 168 struct drm_gem_object *gem_obj = 169 container_of(uobj, struct drm_gem_object, gemo_uvmobj); 170 struct drm_gem_cma_object *obj = to_drm_gem_cma_obj(gem_obj); 171 off_t curr_offset; 172 vaddr_t curr_va; 173 paddr_t paddr, mdpgno; 174 u_int mmapflags; 175 int lcv, retval; 176 vm_prot_t mapprot; 177 178 if (UVM_ET_ISCOPYONWRITE(entry)) 179 return -EIO; 180 181 curr_offset = entry->offset + (vaddr - entry->start); 182 curr_va = vaddr; 183 184 retval = 0; 185 for (lcv = 0; lcv < npages; lcv++, curr_offset += PAGE_SIZE, 186 curr_va += PAGE_SIZE) { 187 if ((flags & PGO_ALLPAGES) == 0 && lcv != centeridx) 188 continue; 189 if (pps[lcv] == PGO_DONTCARE) 190 continue; 191 192 mdpgno = bus_dmamem_mmap(obj->dmat, obj->dmasegs, 1, 193 curr_offset, access_type, BUS_DMA_PREFETCHABLE); 194 if (mdpgno == -1) { 195 retval = -EIO; 196 break; 197 } 198 paddr = pmap_phys_address(mdpgno); 199 mmapflags = pmap_mmap_flags(mdpgno); 200 mapprot = ufi->entry->protection; 201 202 if (pmap_enter(ufi->orig_map->pmap, curr_va, paddr, mapprot, 203 PMAP_CANFAIL | mapprot | mmapflags) != 0) { 204 pmap_update(ufi->orig_map->pmap); 205 uvmfault_unlockall(ufi, ufi->entry->aref.ar_amap, uobj); 206 uvm_wait("drm_gem_cma_fault"); 207 return -ERESTART; 208 } 209 } 210 211 pmap_update(ufi->orig_map->pmap); 212 uvmfault_unlockall(ufi, ufi->entry->aref.ar_amap, uobj); 213 214 return retval; 215 } 216 217 const struct uvm_pagerops drm_gem_cma_uvm_ops = { 218 .pgo_reference = drm_gem_pager_reference, 219 .pgo_detach = drm_gem_pager_detach, 220 .pgo_fault = drm_gem_cma_fault, 221 }; 222
Indexes created Wed Oct 15 16:09:53 GMT 2025