1 /*- 2 * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas. 3 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. 4 * All Rights Reserved. 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a 7 * copy of this software and associated documentation files (the "Software"), 8 * to deal in the Software without restriction, including without limitation 9 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 10 * and/or sell copies of the Software, and to permit persons to whom the 11 * Software is furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice (including the next 14 * paragraph) shall be included in all copies or substantial portions of the 15 * Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 20 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 21 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 22 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 23 * OTHER DEALINGS IN THE SOFTWARE. 24 * 25 * Authors: 26 * Rickard E. (Rik) Faith <faith@valinux.com> 27 * Gareth Hughes <gareth@valinux.com> 28 * 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 /** @file drm_context.c 35 * Implementation of the context management ioctls. 36 */ 37 38 #include <dev/drm2/drmP.h> 39 40 /* ================================================================ 41 * Context bitmap support 42 */ 43 44 void drm_ctxbitmap_free(struct drm_device *dev, int ctx_handle) 45 { 46 if (ctx_handle < 0 || ctx_handle >= DRM_MAX_CTXBITMAP || 47 dev->ctx_bitmap == NULL) { 48 DRM_ERROR("Attempt to free invalid context handle: %d\n", 49 ctx_handle); 50 return; 51 } 52 53 DRM_LOCK(dev); 54 clear_bit(ctx_handle, dev->ctx_bitmap); 55 dev->context_sareas[ctx_handle] = NULL; 56 DRM_UNLOCK(dev); 57 return; 58 } 59 60 int drm_ctxbitmap_next(struct drm_device *dev) 61 { 62 int bit; 63 64 if (dev->ctx_bitmap == NULL) 65 return -1; 66 67 DRM_LOCK(dev); 68 bit = find_first_zero_bit(dev->ctx_bitmap, DRM_MAX_CTXBITMAP); 69 if (bit >= DRM_MAX_CTXBITMAP) { 70 DRM_UNLOCK(dev); 71 return -1; 72 } 73 74 set_bit(bit, dev->ctx_bitmap); 75 DRM_DEBUG("bit : %d\n", bit); 76 if ((bit+1) > dev->max_context) { 77 drm_local_map_t **ctx_sareas; 78 int max_ctx = (bit+1); 79 80 ctx_sareas = realloc(dev->context_sareas, 81 max_ctx * sizeof(*dev->context_sareas), 82 DRM_MEM_SAREA, M_NOWAIT); 83 if (ctx_sareas == NULL) { 84 clear_bit(bit, dev->ctx_bitmap); 85 DRM_DEBUG("failed to allocate bit : %d\n", bit); 86 DRM_UNLOCK(dev); 87 return -1; 88 } 89 dev->max_context = max_ctx; 90 dev->context_sareas = ctx_sareas; 91 dev->context_sareas[bit] = NULL; 92 } 93 DRM_UNLOCK(dev); 94 return bit; 95 } 96 97 int drm_ctxbitmap_init(struct drm_device *dev) 98 { 99 int i; 100 int temp; 101 102 DRM_LOCK(dev); 103 dev->ctx_bitmap = malloc(PAGE_SIZE, DRM_MEM_CTXBITMAP, 104 M_NOWAIT | M_ZERO); 105 if (dev->ctx_bitmap == NULL) { 106 DRM_UNLOCK(dev); 107 return ENOMEM; 108 } 109 dev->context_sareas = NULL; 110 dev->max_context = -1; 111 DRM_UNLOCK(dev); 112 113 for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) { 114 temp = drm_ctxbitmap_next(dev); 115 DRM_DEBUG("drm_ctxbitmap_init : %d\n", temp); 116 } 117 118 return 0; 119 } 120 121 void drm_ctxbitmap_cleanup(struct drm_device *dev) 122 { 123 DRM_LOCK(dev); 124 if (dev->context_sareas != NULL) 125 free(dev->context_sareas, DRM_MEM_SAREA); 126 free(dev->ctx_bitmap, DRM_MEM_CTXBITMAP); 127 DRM_UNLOCK(dev); 128 } 129 130 /* ================================================================ 131 * Per Context SAREA Support 132 */ 133 134 int drm_getsareactx(struct drm_device *dev, void *data, 135 struct drm_file *file_priv) 136 { 137 struct drm_ctx_priv_map *request = data; 138 drm_local_map_t *map; 139 140 DRM_LOCK(dev); 141 if (dev->max_context < 0 || 142 request->ctx_id >= (unsigned) dev->max_context) { 143 DRM_UNLOCK(dev); 144 return EINVAL; 145 } 146 147 map = dev->context_sareas[request->ctx_id]; 148 DRM_UNLOCK(dev); 149 150 request->handle = (void *)map->handle; 151 152 return 0; 153 } 154 155 int drm_setsareactx(struct drm_device *dev, void *data, 156 struct drm_file *file_priv) 157 { 158 struct drm_ctx_priv_map *request = data; 159 drm_local_map_t *map = NULL; 160 161 DRM_LOCK(dev); 162 TAILQ_FOREACH(map, &dev->maplist, link) { 163 if (map->handle == request->handle) { 164 if (dev->max_context < 0) 165 goto bad; 166 if (request->ctx_id >= (unsigned) dev->max_context) 167 goto bad; 168 dev->context_sareas[request->ctx_id] = map; 169 DRM_UNLOCK(dev); 170 return 0; 171 } 172 } 173 174 bad: 175 DRM_UNLOCK(dev); 176 return EINVAL; 177 } 178 179 /* ================================================================ 180 * The actual DRM context handling routines 181 */ 182 183 int drm_context_switch(struct drm_device *dev, int old, int new) 184 { 185 if (atomic_xchg(&dev->context_flag, 1) != 0) { 186 DRM_ERROR("Reentering -- FIXME\n"); 187 return EBUSY; 188 } 189 190 DRM_DEBUG("Context switch from %d to %d\n", old, new); 191 192 if (new == dev->last_context) { 193 atomic_xchg(&dev->context_flag, 0); 194 return 0; 195 } 196 197 return 0; 198 } 199 200 int drm_context_switch_complete(struct drm_device *dev, int new) 201 { 202 dev->last_context = new; /* PRE/POST: This is the _only_ writer. */ 203 204 if (!_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)) { 205 DRM_ERROR("Lock isn't held after context switch\n"); 206 } 207 208 /* If a context switch is ever initiated 209 when the kernel holds the lock, release 210 that lock here. */ 211 atomic_xchg(&dev->context_flag, 0); 212 213 return 0; 214 } 215 216 int drm_resctx(struct drm_device *dev, void *data, struct drm_file *file_priv) 217 { 218 struct drm_ctx_res *res = data; 219 struct drm_ctx ctx; 220 int i; 221 222 if (res->count >= DRM_RESERVED_CONTEXTS) { 223 bzero(&ctx, sizeof(ctx)); 224 for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) { 225 ctx.handle = i; 226 if (DRM_COPY_TO_USER(&res->contexts[i], 227 &ctx, sizeof(ctx))) 228 return EFAULT; 229 } 230 } 231 res->count = DRM_RESERVED_CONTEXTS; 232 233 return 0; 234 } 235 236 int drm_addctx(struct drm_device *dev, void *data, struct drm_file *file_priv) 237 { 238 struct drm_ctx *ctx = data; 239 240 ctx->handle = drm_ctxbitmap_next(dev); 241 if (ctx->handle == DRM_KERNEL_CONTEXT) { 242 /* Skip kernel's context and get a new one. */ 243 ctx->handle = drm_ctxbitmap_next(dev); 244 } 245 DRM_DEBUG("%d\n", ctx->handle); 246 if (ctx->handle == -1) { 247 DRM_DEBUG("Not enough free contexts.\n"); 248 /* Should this return -EBUSY instead? */ 249 return ENOMEM; 250 } 251 252 if (dev->driver->context_ctor && ctx->handle != DRM_KERNEL_CONTEXT) { 253 DRM_LOCK(dev); 254 dev->driver->context_ctor(dev, ctx->handle); 255 DRM_UNLOCK(dev); 256 } 257 258 return 0; 259 } 260 261 int drm_modctx(struct drm_device *dev, void *data, struct drm_file *file_priv) 262 { 263 /* This does nothing */ 264 return 0; 265 } 266 267 int drm_getctx(struct drm_device *dev, void *data, struct drm_file *file_priv) 268 { 269 struct drm_ctx *ctx = data; 270 271 /* This is 0, because we don't handle any context flags */ 272 ctx->flags = 0; 273 274 return 0; 275 } 276 277 int drm_switchctx(struct drm_device *dev, void *data, 278 struct drm_file *file_priv) 279 { 280 struct drm_ctx *ctx = data; 281 282 DRM_DEBUG("%d\n", ctx->handle); 283 return drm_context_switch(dev, dev->last_context, ctx->handle); 284 } 285 286 int drm_newctx(struct drm_device *dev, void *data, struct drm_file *file_priv) 287 { 288 struct drm_ctx *ctx = data; 289 290 DRM_DEBUG("%d\n", ctx->handle); 291 drm_context_switch_complete(dev, ctx->handle); 292 293 return 0; 294 } 295 296 int drm_rmctx(struct drm_device *dev, void *data, struct drm_file *file_priv) 297 { 298 struct drm_ctx *ctx = data; 299 300 DRM_DEBUG("%d\n", ctx->handle); 301 if (ctx->handle != DRM_KERNEL_CONTEXT) { 302 if (dev->driver->context_dtor) { 303 DRM_LOCK(dev); 304 dev->driver->context_dtor(dev, ctx->handle); 305 DRM_UNLOCK(dev); 306 } 307 308 drm_ctxbitmap_free(dev, ctx->handle); 309 } 310 311 return 0; 312 } 313