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 /** @file drm_context.c 32 * Implementation of the context management ioctls. 33 */ 34 35 #include "drmP.h" 36 37 /* ================================================================ 38 * Context bitmap support 39 */ 40 41 void drm_ctxbitmap_free(struct drm_device *dev, int ctx_handle) 42 { 43 if (ctx_handle < 0 || ctx_handle >= DRM_MAX_CTXBITMAP || 44 dev->ctx_bitmap == NULL) { 45 DRM_ERROR("Attempt to free invalid context handle: %d\n", 46 ctx_handle); 47 return; 48 } 49 50 DRM_LOCK(); 51 clear_bit(ctx_handle, dev->ctx_bitmap); 52 dev->context_sareas[ctx_handle] = NULL; 53 DRM_UNLOCK(); 54 return; 55 } 56 57 int drm_ctxbitmap_next(struct drm_device *dev) 58 { 59 int bit; 60 61 if (dev->ctx_bitmap == NULL) 62 return -1; 63 64 DRM_LOCK(); 65 bit = find_first_zero_bit(dev->ctx_bitmap, DRM_MAX_CTXBITMAP); 66 if (bit >= DRM_MAX_CTXBITMAP) { 67 DRM_UNLOCK(); 68 return -1; 69 } 70 71 set_bit(bit, dev->ctx_bitmap); 72 DRM_DEBUG("drm_ctxbitmap_next bit : %d\n", bit); 73 if ((bit+1) > dev->max_context) { 74 dev->max_context = (bit+1); 75 if (dev->context_sareas != NULL) { 76 drm_local_map_t **ctx_sareas; 77 78 ctx_sareas = realloc(dev->context_sareas, 79 dev->max_context * sizeof(*dev->context_sareas), 80 DRM_MEM_SAREA, M_NOWAIT); 81 if (ctx_sareas == NULL) { 82 clear_bit(bit, dev->ctx_bitmap); 83 DRM_UNLOCK(); 84 return -1; 85 } 86 dev->context_sareas = ctx_sareas; 87 dev->context_sareas[bit] = NULL; 88 } else { 89 /* max_context == 1 at this point */ 90 dev->context_sareas = malloc(dev->max_context * 91 sizeof(*dev->context_sareas), DRM_MEM_SAREA, 92 M_NOWAIT); 93 if (dev->context_sareas == NULL) { 94 clear_bit(bit, dev->ctx_bitmap); 95 DRM_UNLOCK(); 96 return -1; 97 } 98 dev->context_sareas[bit] = NULL; 99 } 100 } 101 DRM_UNLOCK(); 102 return bit; 103 } 104 105 int drm_ctxbitmap_init(struct drm_device *dev) 106 { 107 int i; 108 int temp; 109 110 DRM_LOCK(); 111 dev->ctx_bitmap = malloc(PAGE_SIZE, DRM_MEM_CTXBITMAP, 112 M_NOWAIT | M_ZERO); 113 if (dev->ctx_bitmap == NULL) { 114 DRM_UNLOCK(); 115 return ENOMEM; 116 } 117 dev->context_sareas = NULL; 118 dev->max_context = -1; 119 DRM_UNLOCK(); 120 121 for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) { 122 temp = drm_ctxbitmap_next(dev); 123 DRM_DEBUG("drm_ctxbitmap_init : %d\n", temp); 124 } 125 126 return 0; 127 } 128 129 void drm_ctxbitmap_cleanup(struct drm_device *dev) 130 { 131 DRM_LOCK(); 132 if (dev->context_sareas != NULL) 133 free(dev->context_sareas, DRM_MEM_SAREA); 134 free(dev->ctx_bitmap, DRM_MEM_CTXBITMAP); 135 DRM_UNLOCK(); 136 } 137 138 /* ================================================================ 139 * Per Context SAREA Support 140 */ 141 142 int drm_getsareactx(struct drm_device *dev, void *data, 143 struct drm_file *file_priv) 144 { 145 struct drm_ctx_priv_map *request = data; 146 drm_local_map_t *map; 147 148 DRM_LOCK(); 149 if (dev->max_context < 0 || 150 request->ctx_id >= (unsigned) dev->max_context) { 151 DRM_UNLOCK(); 152 return EINVAL; 153 } 154 155 map = dev->context_sareas[request->ctx_id]; 156 DRM_UNLOCK(); 157 158 request->handle = map->handle; 159 160 return 0; 161 } 162 163 int drm_setsareactx(struct drm_device *dev, void *data, 164 struct drm_file *file_priv) 165 { 166 struct drm_ctx_priv_map *request = data; 167 drm_local_map_t *map = NULL; 168 169 DRM_LOCK(); 170 TAILQ_FOREACH(map, &dev->maplist, link) { 171 if (map->handle == request->handle) { 172 if (dev->max_context < 0) 173 goto bad; 174 if (request->ctx_id >= (unsigned) dev->max_context) 175 goto bad; 176 dev->context_sareas[request->ctx_id] = map; 177 DRM_UNLOCK(); 178 return 0; 179 } 180 } 181 182 bad: 183 DRM_UNLOCK(); 184 return EINVAL; 185 } 186 187 /* ================================================================ 188 * The actual DRM context handling routines 189 */ 190 191 int drm_context_switch(struct drm_device *dev, int old, int new) 192 { 193 if (test_and_set_bit(0, &dev->context_flag)) { 194 DRM_ERROR("Reentering -- FIXME\n"); 195 return EBUSY; 196 } 197 198 DRM_DEBUG("Context switch from %d to %d\n", old, new); 199 200 if (new == dev->last_context) { 201 clear_bit(0, &dev->context_flag); 202 return 0; 203 } 204 205 return 0; 206 } 207 208 int drm_context_switch_complete(struct drm_device *dev, int new) 209 { 210 dev->last_context = new; /* PRE/POST: This is the _only_ writer. */ 211 212 if (!_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)) { 213 DRM_ERROR("Lock isn't held after context switch\n"); 214 } 215 216 /* If a context switch is ever initiated 217 when the kernel holds the lock, release 218 that lock here. */ 219 clear_bit(0, &dev->context_flag); 220 221 return 0; 222 } 223 224 int drm_resctx(struct drm_device *dev, void *data, struct drm_file *file_priv) 225 { 226 struct drm_ctx_res *res = data; 227 struct drm_ctx ctx; 228 int i; 229 230 if (res->count >= DRM_RESERVED_CONTEXTS) { 231 bzero(&ctx, sizeof(ctx)); 232 for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) { 233 ctx.handle = i; 234 if (DRM_COPY_TO_USER(&res->contexts[i], 235 &ctx, sizeof(ctx))) 236 return EFAULT; 237 } 238 } 239 res->count = DRM_RESERVED_CONTEXTS; 240 241 return 0; 242 } 243 244 int drm_addctx(struct drm_device *dev, void *data, struct drm_file *file_priv) 245 { 246 struct drm_ctx *ctx = data; 247 248 ctx->handle = drm_ctxbitmap_next(dev); 249 if (ctx->handle == DRM_KERNEL_CONTEXT) { 250 /* Skip kernel's context and get a new one. */ 251 ctx->handle = drm_ctxbitmap_next(dev); 252 } 253 DRM_DEBUG("%d\n", ctx->handle); 254 if (ctx->handle == -1) { 255 DRM_DEBUG("Not enough free contexts.\n"); 256 /* Should this return -EBUSY instead? */ 257 return ENOMEM; 258 } 259 260 if (dev->driver->context_ctor && ctx->handle != DRM_KERNEL_CONTEXT) { 261 DRM_LOCK(); 262 dev->driver->context_ctor(dev, ctx->handle); 263 DRM_UNLOCK(); 264 } 265 266 return 0; 267 } 268 269 int drm_modctx(struct drm_device *dev, void *data, struct drm_file *file_priv) 270 { 271 /* This does nothing */ 272 return 0; 273 } 274 275 int drm_getctx(struct drm_device *dev, void *data, struct drm_file *file_priv) 276 { 277 struct drm_ctx *ctx = data; 278 279 /* This is 0, because we don't handle any context flags */ 280 ctx->flags = 0; 281 282 return 0; 283 } 284 285 int drm_switchctx(struct drm_device *dev, void *data, 286 struct drm_file *file_priv) 287 { 288 struct drm_ctx *ctx = data; 289 290 DRM_DEBUG("%d\n", ctx->handle); 291 return drm_context_switch(dev, dev->last_context, ctx->handle); 292 } 293 294 int drm_newctx(struct drm_device *dev, void *data, struct drm_file *file_priv) 295 { 296 struct drm_ctx *ctx = data; 297 298 DRM_DEBUG("%d\n", ctx->handle); 299 drm_context_switch_complete(dev, ctx->handle); 300 301 return 0; 302 } 303 304 int drm_rmctx(struct drm_device *dev, void *data, struct drm_file *file_priv) 305 { 306 struct drm_ctx *ctx = data; 307 308 DRM_DEBUG("%d\n", ctx->handle); 309 if (ctx->handle != DRM_KERNEL_CONTEXT) { 310 if (dev->driver->context_dtor) { 311 DRM_LOCK(); 312 dev->driver->context_dtor(dev, ctx->handle); 313 DRM_UNLOCK(); 314 } 315 316 drm_ctxbitmap_free(dev, ctx->handle); 317 } 318 319 return 0; 320 } 321