drm_memory.c revision 1.3.2.2
1 1.3.2.2 rmind /* $NetBSD: drm_memory.c,v 1.3.2.2 2014/05/18 17:46:00 rmind Exp $ */ 2 1.3.2.2 rmind 3 1.3.2.2 rmind /*- 4 1.3.2.2 rmind * Copyright (c) 2013 The NetBSD Foundation, Inc. 5 1.3.2.2 rmind * All rights reserved. 6 1.3.2.2 rmind * 7 1.3.2.2 rmind * This code is derived from software contributed to The NetBSD Foundation 8 1.3.2.2 rmind * by Taylor R. Campbell. 9 1.3.2.2 rmind * 10 1.3.2.2 rmind * Redistribution and use in source and binary forms, with or without 11 1.3.2.2 rmind * modification, are permitted provided that the following conditions 12 1.3.2.2 rmind * are met: 13 1.3.2.2 rmind * 1. Redistributions of source code must retain the above copyright 14 1.3.2.2 rmind * notice, this list of conditions and the following disclaimer. 15 1.3.2.2 rmind * 2. Redistributions in binary form must reproduce the above copyright 16 1.3.2.2 rmind * notice, this list of conditions and the following disclaimer in the 17 1.3.2.2 rmind * documentation and/or other materials provided with the distribution. 18 1.3.2.2 rmind * 19 1.3.2.2 rmind * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.3.2.2 rmind * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.3.2.2 rmind * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.3.2.2 rmind * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.3.2.2 rmind * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.3.2.2 rmind * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.3.2.2 rmind * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.3.2.2 rmind * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.3.2.2 rmind * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.3.2.2 rmind * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.3.2.2 rmind * POSSIBILITY OF SUCH DAMAGE. 30 1.3.2.2 rmind */ 31 1.3.2.2 rmind 32 1.3.2.2 rmind #include <sys/cdefs.h> 33 1.3.2.2 rmind __KERNEL_RCSID(0, "$NetBSD: drm_memory.c,v 1.3.2.2 2014/05/18 17:46:00 rmind Exp $"); 34 1.3.2.2 rmind 35 1.3.2.2 rmind #ifdef _KERNEL_OPT 36 1.3.2.2 rmind #include "agp_i810.h" 37 1.3.2.2 rmind #include "genfb.h" 38 1.3.2.2 rmind #else 39 1.3.2.2 rmind #define NAGP_I810 1 /* XXX WTF? */ 40 1.3.2.2 rmind #define NGENFB 0 /* XXX WTF? */ 41 1.3.2.2 rmind #endif 42 1.3.2.2 rmind 43 1.3.2.2 rmind #include <sys/bus.h> 44 1.3.2.2 rmind 45 1.3.2.2 rmind #if NAGP_I810 > 0 46 1.3.2.2 rmind /* XXX include order botch -- shouldn't need to include pcivar.h */ 47 1.3.2.2 rmind #include <dev/pci/pcivar.h> 48 1.3.2.2 rmind #include <dev/pci/agpvar.h> 49 1.3.2.2 rmind #endif 50 1.3.2.2 rmind 51 1.3.2.2 rmind #if NGENFB > 0 52 1.3.2.2 rmind #include <dev/wsfb/genfbvar.h> 53 1.3.2.2 rmind #endif 54 1.3.2.2 rmind 55 1.3.2.2 rmind #include <drm/drmP.h> 56 1.3.2.2 rmind 57 1.3.2.2 rmind /* 58 1.3.2.2 rmind * XXX drm_bus_borrow is a horrible kludge! 59 1.3.2.2 rmind */ 60 1.3.2.2 rmind static bool 61 1.3.2.2 rmind drm_bus_borrow(bus_addr_t base, bus_space_handle_t *handlep) 62 1.3.2.2 rmind { 63 1.3.2.2 rmind 64 1.3.2.2 rmind #if NAGP_I810 > 0 65 1.3.2.2 rmind if (agp_i810_borrow(base, handlep)) 66 1.3.2.2 rmind return true; 67 1.3.2.2 rmind #endif 68 1.3.2.2 rmind 69 1.3.2.2 rmind #if NGENFB > 0 70 1.3.2.2 rmind if (genfb_borrow(base, handlep)) 71 1.3.2.2 rmind return true; 72 1.3.2.2 rmind #endif 73 1.3.2.2 rmind 74 1.3.2.2 rmind return false; 75 1.3.2.2 rmind } 76 1.3.2.2 rmind 77 1.3.2.2 rmind void * 78 1.3.2.2 rmind drm_ioremap(struct drm_device *dev, struct drm_local_map *map) 79 1.3.2.2 rmind { 80 1.3.2.2 rmind const bus_space_tag_t bst = dev->bst; 81 1.3.2.2 rmind unsigned int unit; 82 1.3.2.2 rmind 83 1.3.2.2 rmind /* 84 1.3.2.2 rmind * Search dev's bus maps for a match. 85 1.3.2.2 rmind */ 86 1.3.2.2 rmind for (unit = 0; unit < dev->bus_nmaps; unit++) { 87 1.3.2.2 rmind struct drm_bus_map *const bm = &dev->bus_maps[unit]; 88 1.3.2.2 rmind 89 1.3.2.2 rmind /* Reject maps starting after the request. */ 90 1.3.2.2 rmind if (map->offset < bm->bm_base) 91 1.3.2.2 rmind continue; 92 1.3.2.2 rmind 93 1.3.2.2 rmind /* Reject maps smaller than the request. */ 94 1.3.2.2 rmind if (bm->bm_size < map->size) 95 1.3.2.2 rmind continue; 96 1.3.2.2 rmind 97 1.3.2.2 rmind /* Reject maps that the request doesn't fit in. */ 98 1.3.2.2 rmind if ((bm->bm_size - map->size) < 99 1.3.2.2 rmind (map->offset - bm->bm_base)) 100 1.3.2.2 rmind continue; 101 1.3.2.2 rmind 102 1.3.2.2 rmind /* Ensure we can map the space into virtual memory. */ 103 1.3.2.2 rmind if (!ISSET(bm->bm_flags, BUS_SPACE_MAP_LINEAR)) 104 1.3.2.2 rmind continue; 105 1.3.2.2 rmind 106 1.3.2.2 rmind /* Map it. */ 107 1.3.2.2 rmind if (bus_space_map(bst, map->offset, map->size, 108 1.3.2.2 rmind bm->bm_flags, &map->lm_data.bus_space.bsh)) 109 1.3.2.2 rmind break; 110 1.3.2.2 rmind 111 1.3.2.2 rmind map->lm_data.bus_space.bus_map = bm; 112 1.3.2.2 rmind goto win; 113 1.3.2.2 rmind } 114 1.3.2.2 rmind 115 1.3.2.2 rmind /* Couldn't map it. Try borrowing from someone else. */ 116 1.3.2.2 rmind if (drm_bus_borrow(map->offset, &map->lm_data.bus_space.bsh)) { 117 1.3.2.2 rmind map->lm_data.bus_space.bus_map = NULL; 118 1.3.2.2 rmind goto win; 119 1.3.2.2 rmind } 120 1.3.2.2 rmind 121 1.3.2.2 rmind /* Failure! */ 122 1.3.2.2 rmind return NULL; 123 1.3.2.2 rmind 124 1.3.2.2 rmind win: map->lm_data.bus_space.bst = bst; 125 1.3.2.2 rmind return bus_space_vaddr(bst, map->lm_data.bus_space.bsh); 126 1.3.2.2 rmind } 127 1.3.2.2 rmind 128 1.3.2.2 rmind void 129 1.3.2.2 rmind drm_iounmap(struct drm_device *dev, struct drm_local_map *map) 130 1.3.2.2 rmind { 131 1.3.2.2 rmind if (map->lm_data.bus_space.bus_map != NULL) { 132 1.3.2.2 rmind bus_space_unmap(map->lm_data.bus_space.bst, 133 1.3.2.2 rmind map->lm_data.bus_space.bsh, map->size); 134 1.3.2.2 rmind map->lm_data.bus_space.bus_map = NULL; 135 1.3.2.2 rmind } 136 1.3.2.2 rmind } 137 1.3.2.2 rmind 138 1.3.2.2 rmind /* 139 1.3.2.2 rmind * Allocate a drm dma handle, allocate memory fit for DMA, and map it. 140 1.3.2.2 rmind * 141 1.3.2.2 rmind * XXX This is called drm_pci_alloc for hysterical raisins; it is not 142 1.3.2.2 rmind * specific to PCI. 143 1.3.2.2 rmind * 144 1.3.2.2 rmind * XXX For now, we use non-blocking allocations because this is called 145 1.3.2.2 rmind * by ioctls with the drm global mutex held. 146 1.3.2.2 rmind * 147 1.3.2.2 rmind * XXX Error information is lost because this returns NULL on failure, 148 1.3.2.2 rmind * not even an error embedded in a pointer. 149 1.3.2.2 rmind */ 150 1.3.2.2 rmind struct drm_dma_handle * 151 1.3.2.2 rmind drm_pci_alloc(struct drm_device *dev, size_t size, size_t align) 152 1.3.2.2 rmind { 153 1.3.2.2 rmind int nsegs; 154 1.3.2.2 rmind int error; 155 1.3.2.2 rmind 156 1.3.2.2 rmind /* 157 1.3.2.2 rmind * Allocate a drm_dma_handle record. 158 1.3.2.2 rmind */ 159 1.3.2.2 rmind struct drm_dma_handle *const dmah = kmem_alloc(sizeof(*dmah), 160 1.3.2.2 rmind KM_NOSLEEP); 161 1.3.2.2 rmind if (dmah == NULL) { 162 1.3.2.2 rmind error = -ENOMEM; 163 1.3.2.2 rmind goto out; 164 1.3.2.2 rmind } 165 1.3.2.2 rmind dmah->dmah_tag = dev->dmat; 166 1.3.2.2 rmind 167 1.3.2.2 rmind /* 168 1.3.2.2 rmind * Allocate the requested amount of DMA-safe memory. 169 1.3.2.2 rmind */ 170 1.3.2.2 rmind /* XXX errno NetBSD->Linux */ 171 1.3.2.2 rmind error = -bus_dmamem_alloc(dmah->dmah_tag, size, align, 0, 172 1.3.2.2 rmind &dmah->dmah_seg, 1, &nsegs, BUS_DMA_NOWAIT); 173 1.3.2.2 rmind if (error) 174 1.3.2.2 rmind goto fail0; 175 1.3.2.2 rmind KASSERT(nsegs == 1); 176 1.3.2.2 rmind 177 1.3.2.2 rmind /* 178 1.3.2.2 rmind * XXX Old drm passed BUS_DMA_NOWAIT below but BUS_DMA_WAITOK 179 1.3.2.2 rmind * above. WTF? 180 1.3.2.2 rmind */ 181 1.3.2.2 rmind 182 1.3.2.2 rmind /* 183 1.3.2.2 rmind * Map the DMA-safe memory into kernel virtual address space. 184 1.3.2.2 rmind */ 185 1.3.2.2 rmind /* XXX errno NetBSD->Linux */ 186 1.3.2.2 rmind error = -bus_dmamem_map(dmah->dmah_tag, &dmah->dmah_seg, 1, size, 187 1.3.2.2 rmind &dmah->vaddr, 188 1.3.2.2 rmind (BUS_DMA_NOWAIT | BUS_DMA_COHERENT | BUS_DMA_NOCACHE)); 189 1.3.2.2 rmind if (error) 190 1.3.2.2 rmind goto fail1; 191 1.3.2.2 rmind dmah->size = size; 192 1.3.2.2 rmind 193 1.3.2.2 rmind /* 194 1.3.2.2 rmind * Create a map for DMA transfers. 195 1.3.2.2 rmind */ 196 1.3.2.2 rmind /* XXX errno NetBSD->Linux */ 197 1.3.2.2 rmind error = -bus_dmamap_create(dmah->dmah_tag, size, 1, size, 0, 198 1.3.2.2 rmind BUS_DMA_NOWAIT, &dmah->dmah_map); 199 1.3.2.2 rmind if (error) 200 1.3.2.2 rmind goto fail2; 201 1.3.2.2 rmind 202 1.3.2.2 rmind /* 203 1.3.2.2 rmind * Load the kva buffer into the map for DMA transfers. 204 1.3.2.2 rmind */ 205 1.3.2.2 rmind /* XXX errno NetBSD->Linux */ 206 1.3.2.2 rmind error = -bus_dmamap_load(dmah->dmah_tag, dmah->dmah_map, dmah->vaddr, 207 1.3.2.2 rmind size, NULL, (BUS_DMA_NOWAIT | BUS_DMA_NOCACHE)); 208 1.3.2.2 rmind if (error) 209 1.3.2.2 rmind goto fail3; 210 1.3.2.2 rmind 211 1.3.2.2 rmind /* Record the bus address for convenient reference. */ 212 1.3.2.2 rmind dmah->busaddr = dmah->dmah_map->dm_segs[0].ds_addr; 213 1.3.2.2 rmind 214 1.3.2.2 rmind /* Zero the DMA buffer. XXX Yikes! Is this necessary? */ 215 1.3.2.2 rmind memset(dmah->vaddr, 0, size); 216 1.3.2.2 rmind 217 1.3.2.2 rmind /* Success! */ 218 1.3.2.2 rmind return dmah; 219 1.3.2.2 rmind 220 1.3.2.2 rmind fail3: bus_dmamap_destroy(dmah->dmah_tag, dmah->dmah_map); 221 1.3.2.2 rmind fail2: bus_dmamem_unmap(dmah->dmah_tag, dmah->vaddr, dmah->size); 222 1.3.2.2 rmind fail1: bus_dmamem_free(dmah->dmah_tag, &dmah->dmah_seg, 1); 223 1.3.2.2 rmind fail0: dmah->dmah_tag = NULL; /* XXX paranoia */ 224 1.3.2.2 rmind kmem_free(dmah, sizeof(*dmah)); 225 1.3.2.2 rmind out: DRM_DEBUG("drm_pci_alloc failed: %d\n", error); 226 1.3.2.2 rmind return NULL; 227 1.3.2.2 rmind } 228 1.3.2.2 rmind 229 1.3.2.2 rmind /* 230 1.3.2.2 rmind * Release the bus DMA mappings and memory in dmah, and deallocate it. 231 1.3.2.2 rmind */ 232 1.3.2.2 rmind void 233 1.3.2.2 rmind drm_pci_free(struct drm_device *dev, struct drm_dma_handle *dmah) 234 1.3.2.2 rmind { 235 1.3.2.2 rmind 236 1.3.2.2 rmind bus_dmamap_unload(dmah->dmah_tag, dmah->dmah_map); 237 1.3.2.2 rmind bus_dmamap_destroy(dmah->dmah_tag, dmah->dmah_map); 238 1.3.2.2 rmind bus_dmamem_unmap(dmah->dmah_tag, dmah->vaddr, dmah->size); 239 1.3.2.2 rmind bus_dmamem_free(dmah->dmah_tag, &dmah->dmah_seg, 1); 240 1.3.2.2 rmind dmah->dmah_tag = NULL; /* XXX paranoia */ 241 1.3.2.2 rmind kmem_free(dmah, sizeof(*dmah)); 242 1.3.2.2 rmind } 243 1.3.2.2 rmind 244 1.3.2.2 rmind /* 245 1.3.2.2 rmind * Make sure the DMA-safe memory allocated for dev lies between 246 1.3.2.2 rmind * min_addr and max_addr. Can be used multiple times to restrict the 247 1.3.2.2 rmind * bounds further, but never to expand the bounds again. 248 1.3.2.2 rmind * 249 1.3.2.2 rmind * XXX Caller must guarantee nobody has used the tag yet, 250 1.3.2.2 rmind * i.e. allocated any DMA memory. 251 1.3.2.2 rmind */ 252 1.3.2.2 rmind int 253 1.3.2.2 rmind drm_limit_dma_space(struct drm_device *dev, resource_size_t min_addr, 254 1.3.2.2 rmind resource_size_t max_addr) 255 1.3.2.2 rmind { 256 1.3.2.2 rmind int ret; 257 1.3.2.2 rmind 258 1.3.2.2 rmind KASSERT(min_addr <= max_addr); 259 1.3.2.2 rmind 260 1.3.2.2 rmind /* 261 1.3.2.2 rmind * Limit it further if we have already limited it, and destroy 262 1.3.2.2 rmind * the old subregion DMA tag. 263 1.3.2.2 rmind */ 264 1.3.2.2 rmind if (dev->dmat_subregion_p) { 265 1.3.2.2 rmind min_addr = MAX(min_addr, dev->dmat_subregion_min); 266 1.3.2.2 rmind max_addr = MIN(max_addr, dev->dmat_subregion_max); 267 1.3.2.2 rmind bus_dmatag_destroy(dev->dmat); 268 1.3.2.2 rmind } 269 1.3.2.2 rmind 270 1.3.2.2 rmind /* 271 1.3.2.2 rmind * Create a DMA tag for a subregion from the bus's DMA tag. If 272 1.3.2.2 rmind * that fails, restore dev->dmat to the whole region so that we 273 1.3.2.2 rmind * need not worry about dev->dmat being uninitialized (not that 274 1.3.2.2 rmind * the caller should try to allocate DMA-safe memory on failure 275 1.3.2.2 rmind * anyway, but...paranoia). 276 1.3.2.2 rmind */ 277 1.3.2.2 rmind /* XXX errno NetBSD->Linux */ 278 1.3.2.2 rmind ret = -bus_dmatag_subregion(dev->bus_dmat, min_addr, max_addr, 279 1.3.2.2 rmind &dev->dmat, BUS_DMA_WAITOK); 280 1.3.2.2 rmind if (ret) { 281 1.3.2.2 rmind dev->dmat = dev->bus_dmat; 282 1.3.2.2 rmind dev->dmat_subregion_p = false; 283 1.3.2.2 rmind return ret; 284 1.3.2.2 rmind } 285 1.3.2.2 rmind 286 1.3.2.2 rmind /* 287 1.3.2.2 rmind * Remember that we have a subregion tag so that we know to 288 1.3.2.2 rmind * destroy it later, and record the bounds in case we need to 289 1.3.2.2 rmind * limit them again. 290 1.3.2.2 rmind */ 291 1.3.2.2 rmind dev->dmat_subregion_p = true; 292 1.3.2.2 rmind dev->dmat_subregion_min = min_addr; 293 1.3.2.2 rmind dev->dmat_subregion_max = max_addr; 294 1.3.2.2 rmind 295 1.3.2.2 rmind /* Success! */ 296 1.3.2.2 rmind return 0; 297 1.3.2.2 rmind } 298
Indexes created Fri Oct 03 02:09:57 GMT 2025