1*7f3c3d6fSHasso Tepper /*- 2*7f3c3d6fSHasso Tepper * Copyright 1999, 2000 Precision Insight, Inc., Cedar Park, Texas. 3*7f3c3d6fSHasso Tepper * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. 4*7f3c3d6fSHasso Tepper * All Rights Reserved. 5*7f3c3d6fSHasso Tepper * 6*7f3c3d6fSHasso Tepper * Permission is hereby granted, free of charge, to any person obtaining a 7*7f3c3d6fSHasso Tepper * copy of this software and associated documentation files (the "Software"), 8*7f3c3d6fSHasso Tepper * to deal in the Software without restriction, including without limitation 9*7f3c3d6fSHasso Tepper * the rights to use, copy, modify, merge, publish, distribute, sublicense, 10*7f3c3d6fSHasso Tepper * and/or sell copies of the Software, and to permit persons to whom the 11*7f3c3d6fSHasso Tepper * Software is furnished to do so, subject to the following conditions: 12*7f3c3d6fSHasso Tepper * 13*7f3c3d6fSHasso Tepper * The above copyright notice and this permission notice (including the next 14*7f3c3d6fSHasso Tepper * paragraph) shall be included in all copies or substantial portions of the 15*7f3c3d6fSHasso Tepper * Software. 16*7f3c3d6fSHasso Tepper * 17*7f3c3d6fSHasso Tepper * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18*7f3c3d6fSHasso Tepper * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19*7f3c3d6fSHasso Tepper * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 20*7f3c3d6fSHasso Tepper * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR 21*7f3c3d6fSHasso Tepper * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 22*7f3c3d6fSHasso Tepper * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 23*7f3c3d6fSHasso Tepper * OTHER DEALINGS IN THE SOFTWARE. 24*7f3c3d6fSHasso Tepper * 25*7f3c3d6fSHasso Tepper * Authors: 26*7f3c3d6fSHasso Tepper * Rickard E. (Rik) Faith <faith@valinux.com> 27*7f3c3d6fSHasso Tepper * Gareth Hughes <gareth@valinux.com> 28*7f3c3d6fSHasso Tepper * 29*7f3c3d6fSHasso Tepper * $DragonFly: src/sys/dev/drm/drm_context.c,v 1.1 2008/04/05 18:12:29 hasso Exp $ 30*7f3c3d6fSHasso Tepper */ 31*7f3c3d6fSHasso Tepper 32*7f3c3d6fSHasso Tepper /** @file drm_context.c 33*7f3c3d6fSHasso Tepper * Implementation of the context management ioctls. 34*7f3c3d6fSHasso Tepper */ 35*7f3c3d6fSHasso Tepper 36*7f3c3d6fSHasso Tepper #include "drmP.h" 37*7f3c3d6fSHasso Tepper 38*7f3c3d6fSHasso Tepper /* ================================================================ 39*7f3c3d6fSHasso Tepper * Context bitmap support 40*7f3c3d6fSHasso Tepper */ 41*7f3c3d6fSHasso Tepper 42*7f3c3d6fSHasso Tepper void drm_ctxbitmap_free(drm_device_t *dev, int ctx_handle) 43*7f3c3d6fSHasso Tepper { 44*7f3c3d6fSHasso Tepper if (ctx_handle < 0 || ctx_handle >= DRM_MAX_CTXBITMAP || 45*7f3c3d6fSHasso Tepper dev->ctx_bitmap == NULL) { 46*7f3c3d6fSHasso Tepper DRM_ERROR("Attempt to free invalid context handle: %d\n", 47*7f3c3d6fSHasso Tepper ctx_handle); 48*7f3c3d6fSHasso Tepper return; 49*7f3c3d6fSHasso Tepper } 50*7f3c3d6fSHasso Tepper 51*7f3c3d6fSHasso Tepper DRM_LOCK(); 52*7f3c3d6fSHasso Tepper clear_bit(ctx_handle, dev->ctx_bitmap); 53*7f3c3d6fSHasso Tepper dev->context_sareas[ctx_handle] = NULL; 54*7f3c3d6fSHasso Tepper DRM_UNLOCK(); 55*7f3c3d6fSHasso Tepper return; 56*7f3c3d6fSHasso Tepper } 57*7f3c3d6fSHasso Tepper 58*7f3c3d6fSHasso Tepper int drm_ctxbitmap_next(drm_device_t *dev) 59*7f3c3d6fSHasso Tepper { 60*7f3c3d6fSHasso Tepper int bit; 61*7f3c3d6fSHasso Tepper 62*7f3c3d6fSHasso Tepper if (dev->ctx_bitmap == NULL) 63*7f3c3d6fSHasso Tepper return -1; 64*7f3c3d6fSHasso Tepper 65*7f3c3d6fSHasso Tepper DRM_LOCK(); 66*7f3c3d6fSHasso Tepper bit = find_first_zero_bit( dev->ctx_bitmap, DRM_MAX_CTXBITMAP ); 67*7f3c3d6fSHasso Tepper if (bit >= DRM_MAX_CTXBITMAP) { 68*7f3c3d6fSHasso Tepper DRM_UNLOCK(); 69*7f3c3d6fSHasso Tepper return -1; 70*7f3c3d6fSHasso Tepper } 71*7f3c3d6fSHasso Tepper 72*7f3c3d6fSHasso Tepper set_bit(bit, dev->ctx_bitmap); 73*7f3c3d6fSHasso Tepper DRM_DEBUG("drm_ctxbitmap_next bit : %d\n", bit); 74*7f3c3d6fSHasso Tepper if ((bit+1) > dev->max_context) { 75*7f3c3d6fSHasso Tepper dev->max_context = (bit+1); 76*7f3c3d6fSHasso Tepper if (dev->context_sareas != NULL) { 77*7f3c3d6fSHasso Tepper drm_local_map_t **ctx_sareas; 78*7f3c3d6fSHasso Tepper 79*7f3c3d6fSHasso Tepper ctx_sareas = realloc(dev->context_sareas, 80*7f3c3d6fSHasso Tepper dev->max_context * sizeof(*dev->context_sareas), 81*7f3c3d6fSHasso Tepper M_DRM, M_NOWAIT); 82*7f3c3d6fSHasso Tepper if (ctx_sareas == NULL) { 83*7f3c3d6fSHasso Tepper clear_bit(bit, dev->ctx_bitmap); 84*7f3c3d6fSHasso Tepper DRM_UNLOCK(); 85*7f3c3d6fSHasso Tepper return -1; 86*7f3c3d6fSHasso Tepper } 87*7f3c3d6fSHasso Tepper dev->context_sareas = ctx_sareas; 88*7f3c3d6fSHasso Tepper dev->context_sareas[bit] = NULL; 89*7f3c3d6fSHasso Tepper } else { 90*7f3c3d6fSHasso Tepper /* max_context == 1 at this point */ 91*7f3c3d6fSHasso Tepper dev->context_sareas = malloc(dev->max_context * 92*7f3c3d6fSHasso Tepper sizeof(*dev->context_sareas), M_DRM, M_NOWAIT); 93*7f3c3d6fSHasso Tepper if (dev->context_sareas == NULL) { 94*7f3c3d6fSHasso Tepper clear_bit(bit, dev->ctx_bitmap); 95*7f3c3d6fSHasso Tepper DRM_UNLOCK(); 96*7f3c3d6fSHasso Tepper return -1; 97*7f3c3d6fSHasso Tepper } 98*7f3c3d6fSHasso Tepper dev->context_sareas[bit] = NULL; 99*7f3c3d6fSHasso Tepper } 100*7f3c3d6fSHasso Tepper } 101*7f3c3d6fSHasso Tepper DRM_UNLOCK(); 102*7f3c3d6fSHasso Tepper return bit; 103*7f3c3d6fSHasso Tepper } 104*7f3c3d6fSHasso Tepper 105*7f3c3d6fSHasso Tepper int drm_ctxbitmap_init(drm_device_t *dev) 106*7f3c3d6fSHasso Tepper { 107*7f3c3d6fSHasso Tepper int i; 108*7f3c3d6fSHasso Tepper int temp; 109*7f3c3d6fSHasso Tepper 110*7f3c3d6fSHasso Tepper DRM_LOCK(); 111*7f3c3d6fSHasso Tepper dev->ctx_bitmap = malloc(PAGE_SIZE, M_DRM, M_NOWAIT | M_ZERO); 112*7f3c3d6fSHasso Tepper if ( dev->ctx_bitmap == NULL ) { 113*7f3c3d6fSHasso Tepper DRM_UNLOCK(); 114*7f3c3d6fSHasso Tepper return ENOMEM; 115*7f3c3d6fSHasso Tepper } 116*7f3c3d6fSHasso Tepper dev->context_sareas = NULL; 117*7f3c3d6fSHasso Tepper dev->max_context = -1; 118*7f3c3d6fSHasso Tepper DRM_UNLOCK(); 119*7f3c3d6fSHasso Tepper 120*7f3c3d6fSHasso Tepper for ( i = 0 ; i < DRM_RESERVED_CONTEXTS ; i++ ) { 121*7f3c3d6fSHasso Tepper temp = drm_ctxbitmap_next(dev); 122*7f3c3d6fSHasso Tepper DRM_DEBUG( "drm_ctxbitmap_init : %d\n", temp ); 123*7f3c3d6fSHasso Tepper } 124*7f3c3d6fSHasso Tepper 125*7f3c3d6fSHasso Tepper return 0; 126*7f3c3d6fSHasso Tepper } 127*7f3c3d6fSHasso Tepper 128*7f3c3d6fSHasso Tepper void drm_ctxbitmap_cleanup(drm_device_t *dev) 129*7f3c3d6fSHasso Tepper { 130*7f3c3d6fSHasso Tepper DRM_LOCK(); 131*7f3c3d6fSHasso Tepper if (dev->context_sareas != NULL) 132*7f3c3d6fSHasso Tepper free(dev->context_sareas, M_DRM); 133*7f3c3d6fSHasso Tepper free(dev->ctx_bitmap, M_DRM); 134*7f3c3d6fSHasso Tepper DRM_UNLOCK(); 135*7f3c3d6fSHasso Tepper } 136*7f3c3d6fSHasso Tepper 137*7f3c3d6fSHasso Tepper /* ================================================================ 138*7f3c3d6fSHasso Tepper * Per Context SAREA Support 139*7f3c3d6fSHasso Tepper */ 140*7f3c3d6fSHasso Tepper 141*7f3c3d6fSHasso Tepper int drm_getsareactx( drm_device_t *dev, void *data, struct drm_file *file_priv ) 142*7f3c3d6fSHasso Tepper { 143*7f3c3d6fSHasso Tepper drm_ctx_priv_map_t *request = data; 144*7f3c3d6fSHasso Tepper drm_local_map_t *map; 145*7f3c3d6fSHasso Tepper 146*7f3c3d6fSHasso Tepper DRM_LOCK(); 147*7f3c3d6fSHasso Tepper if (dev->max_context < 0 || 148*7f3c3d6fSHasso Tepper request->ctx_id >= (unsigned) dev->max_context) { 149*7f3c3d6fSHasso Tepper DRM_UNLOCK(); 150*7f3c3d6fSHasso Tepper return EINVAL; 151*7f3c3d6fSHasso Tepper } 152*7f3c3d6fSHasso Tepper 153*7f3c3d6fSHasso Tepper map = dev->context_sareas[request->ctx_id]; 154*7f3c3d6fSHasso Tepper DRM_UNLOCK(); 155*7f3c3d6fSHasso Tepper 156*7f3c3d6fSHasso Tepper request->handle = map->handle; 157*7f3c3d6fSHasso Tepper 158*7f3c3d6fSHasso Tepper return 0; 159*7f3c3d6fSHasso Tepper } 160*7f3c3d6fSHasso Tepper 161*7f3c3d6fSHasso Tepper int drm_setsareactx(drm_device_t *dev, void *data, struct drm_file *file_priv) 162*7f3c3d6fSHasso Tepper { 163*7f3c3d6fSHasso Tepper drm_ctx_priv_map_t *request = data; 164*7f3c3d6fSHasso Tepper drm_local_map_t *map = NULL; 165*7f3c3d6fSHasso Tepper 166*7f3c3d6fSHasso Tepper DRM_LOCK(); 167*7f3c3d6fSHasso Tepper TAILQ_FOREACH(map, &dev->maplist, link) { 168*7f3c3d6fSHasso Tepper if (map->handle == request->handle) { 169*7f3c3d6fSHasso Tepper if (dev->max_context < 0) 170*7f3c3d6fSHasso Tepper goto bad; 171*7f3c3d6fSHasso Tepper if (request->ctx_id >= (unsigned) dev->max_context) 172*7f3c3d6fSHasso Tepper goto bad; 173*7f3c3d6fSHasso Tepper dev->context_sareas[request->ctx_id] = map; 174*7f3c3d6fSHasso Tepper DRM_UNLOCK(); 175*7f3c3d6fSHasso Tepper return 0; 176*7f3c3d6fSHasso Tepper } 177*7f3c3d6fSHasso Tepper } 178*7f3c3d6fSHasso Tepper 179*7f3c3d6fSHasso Tepper bad: 180*7f3c3d6fSHasso Tepper DRM_UNLOCK(); 181*7f3c3d6fSHasso Tepper return EINVAL; 182*7f3c3d6fSHasso Tepper } 183*7f3c3d6fSHasso Tepper 184*7f3c3d6fSHasso Tepper /* ================================================================ 185*7f3c3d6fSHasso Tepper * The actual DRM context handling routines 186*7f3c3d6fSHasso Tepper */ 187*7f3c3d6fSHasso Tepper 188*7f3c3d6fSHasso Tepper int drm_context_switch(drm_device_t *dev, int old, int new) 189*7f3c3d6fSHasso Tepper { 190*7f3c3d6fSHasso Tepper if ( test_and_set_bit( 0, &dev->context_flag ) ) { 191*7f3c3d6fSHasso Tepper DRM_ERROR( "Reentering -- FIXME\n" ); 192*7f3c3d6fSHasso Tepper return EBUSY; 193*7f3c3d6fSHasso Tepper } 194*7f3c3d6fSHasso Tepper 195*7f3c3d6fSHasso Tepper DRM_DEBUG( "Context switch from %d to %d\n", old, new ); 196*7f3c3d6fSHasso Tepper 197*7f3c3d6fSHasso Tepper if ( new == dev->last_context ) { 198*7f3c3d6fSHasso Tepper clear_bit( 0, &dev->context_flag ); 199*7f3c3d6fSHasso Tepper return 0; 200*7f3c3d6fSHasso Tepper } 201*7f3c3d6fSHasso Tepper 202*7f3c3d6fSHasso Tepper return 0; 203*7f3c3d6fSHasso Tepper } 204*7f3c3d6fSHasso Tepper 205*7f3c3d6fSHasso Tepper int drm_context_switch_complete(drm_device_t *dev, int new) 206*7f3c3d6fSHasso Tepper { 207*7f3c3d6fSHasso Tepper dev->last_context = new; /* PRE/POST: This is the _only_ writer. */ 208*7f3c3d6fSHasso Tepper 209*7f3c3d6fSHasso Tepper if ( !_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock) ) { 210*7f3c3d6fSHasso Tepper DRM_ERROR( "Lock isn't held after context switch\n" ); 211*7f3c3d6fSHasso Tepper } 212*7f3c3d6fSHasso Tepper 213*7f3c3d6fSHasso Tepper /* If a context switch is ever initiated 214*7f3c3d6fSHasso Tepper when the kernel holds the lock, release 215*7f3c3d6fSHasso Tepper that lock here. */ 216*7f3c3d6fSHasso Tepper clear_bit( 0, &dev->context_flag ); 217*7f3c3d6fSHasso Tepper 218*7f3c3d6fSHasso Tepper return 0; 219*7f3c3d6fSHasso Tepper } 220*7f3c3d6fSHasso Tepper 221*7f3c3d6fSHasso Tepper int drm_resctx(drm_device_t *dev, void *data, struct drm_file *file_priv) 222*7f3c3d6fSHasso Tepper { 223*7f3c3d6fSHasso Tepper drm_ctx_res_t *res = data; 224*7f3c3d6fSHasso Tepper drm_ctx_t ctx; 225*7f3c3d6fSHasso Tepper int i; 226*7f3c3d6fSHasso Tepper 227*7f3c3d6fSHasso Tepper if ( res->count >= DRM_RESERVED_CONTEXTS ) { 228*7f3c3d6fSHasso Tepper bzero(&ctx, sizeof(ctx)); 229*7f3c3d6fSHasso Tepper for ( i = 0 ; i < DRM_RESERVED_CONTEXTS ; i++ ) { 230*7f3c3d6fSHasso Tepper ctx.handle = i; 231*7f3c3d6fSHasso Tepper if ( DRM_COPY_TO_USER( &res->contexts[i], 232*7f3c3d6fSHasso Tepper &ctx, sizeof(ctx) ) ) 233*7f3c3d6fSHasso Tepper return EFAULT; 234*7f3c3d6fSHasso Tepper } 235*7f3c3d6fSHasso Tepper } 236*7f3c3d6fSHasso Tepper res->count = DRM_RESERVED_CONTEXTS; 237*7f3c3d6fSHasso Tepper 238*7f3c3d6fSHasso Tepper return 0; 239*7f3c3d6fSHasso Tepper } 240*7f3c3d6fSHasso Tepper 241*7f3c3d6fSHasso Tepper int drm_addctx(drm_device_t *dev, void *data, struct drm_file *file_priv) 242*7f3c3d6fSHasso Tepper { 243*7f3c3d6fSHasso Tepper drm_ctx_t *ctx = data; 244*7f3c3d6fSHasso Tepper 245*7f3c3d6fSHasso Tepper ctx->handle = drm_ctxbitmap_next(dev); 246*7f3c3d6fSHasso Tepper if ( ctx->handle == DRM_KERNEL_CONTEXT ) { 247*7f3c3d6fSHasso Tepper /* Skip kernel's context and get a new one. */ 248*7f3c3d6fSHasso Tepper ctx->handle = drm_ctxbitmap_next(dev); 249*7f3c3d6fSHasso Tepper } 250*7f3c3d6fSHasso Tepper DRM_DEBUG( "%d\n", ctx->handle ); 251*7f3c3d6fSHasso Tepper if ( ctx->handle == -1 ) { 252*7f3c3d6fSHasso Tepper DRM_DEBUG( "Not enough free contexts.\n" ); 253*7f3c3d6fSHasso Tepper /* Should this return -EBUSY instead? */ 254*7f3c3d6fSHasso Tepper return ENOMEM; 255*7f3c3d6fSHasso Tepper } 256*7f3c3d6fSHasso Tepper 257*7f3c3d6fSHasso Tepper if (dev->driver.context_ctor && ctx->handle != DRM_KERNEL_CONTEXT) { 258*7f3c3d6fSHasso Tepper DRM_LOCK(); 259*7f3c3d6fSHasso Tepper dev->driver.context_ctor(dev, ctx->handle); 260*7f3c3d6fSHasso Tepper DRM_UNLOCK(); 261*7f3c3d6fSHasso Tepper } 262*7f3c3d6fSHasso Tepper 263*7f3c3d6fSHasso Tepper return 0; 264*7f3c3d6fSHasso Tepper } 265*7f3c3d6fSHasso Tepper 266*7f3c3d6fSHasso Tepper int drm_modctx(drm_device_t *dev, void *data, struct drm_file *file_priv) 267*7f3c3d6fSHasso Tepper { 268*7f3c3d6fSHasso Tepper /* This does nothing */ 269*7f3c3d6fSHasso Tepper return 0; 270*7f3c3d6fSHasso Tepper } 271*7f3c3d6fSHasso Tepper 272*7f3c3d6fSHasso Tepper int drm_getctx(drm_device_t *dev, void *data, struct drm_file *file_priv) 273*7f3c3d6fSHasso Tepper { 274*7f3c3d6fSHasso Tepper drm_ctx_t *ctx = data; 275*7f3c3d6fSHasso Tepper 276*7f3c3d6fSHasso Tepper /* This is 0, because we don't handle any context flags */ 277*7f3c3d6fSHasso Tepper ctx->flags = 0; 278*7f3c3d6fSHasso Tepper 279*7f3c3d6fSHasso Tepper return 0; 280*7f3c3d6fSHasso Tepper } 281*7f3c3d6fSHasso Tepper 282*7f3c3d6fSHasso Tepper int drm_switchctx(drm_device_t *dev, void *data, struct drm_file *file_priv) 283*7f3c3d6fSHasso Tepper { 284*7f3c3d6fSHasso Tepper drm_ctx_t *ctx = data; 285*7f3c3d6fSHasso Tepper 286*7f3c3d6fSHasso Tepper DRM_DEBUG( "%d\n", ctx->handle ); 287*7f3c3d6fSHasso Tepper return drm_context_switch(dev, dev->last_context, ctx->handle); 288*7f3c3d6fSHasso Tepper } 289*7f3c3d6fSHasso Tepper 290*7f3c3d6fSHasso Tepper int drm_newctx(drm_device_t *dev, void *data, struct drm_file *file_priv) 291*7f3c3d6fSHasso Tepper { 292*7f3c3d6fSHasso Tepper drm_ctx_t *ctx = data; 293*7f3c3d6fSHasso Tepper 294*7f3c3d6fSHasso Tepper DRM_DEBUG( "%d\n", ctx->handle ); 295*7f3c3d6fSHasso Tepper drm_context_switch_complete(dev, ctx->handle); 296*7f3c3d6fSHasso Tepper 297*7f3c3d6fSHasso Tepper return 0; 298*7f3c3d6fSHasso Tepper } 299*7f3c3d6fSHasso Tepper 300*7f3c3d6fSHasso Tepper int drm_rmctx(drm_device_t *dev, void *data, struct drm_file *file_priv) 301*7f3c3d6fSHasso Tepper { 302*7f3c3d6fSHasso Tepper drm_ctx_t *ctx = data; 303*7f3c3d6fSHasso Tepper 304*7f3c3d6fSHasso Tepper DRM_DEBUG( "%d\n", ctx->handle ); 305*7f3c3d6fSHasso Tepper if ( ctx->handle != DRM_KERNEL_CONTEXT ) { 306*7f3c3d6fSHasso Tepper if (dev->driver.context_dtor) { 307*7f3c3d6fSHasso Tepper DRM_LOCK(); 308*7f3c3d6fSHasso Tepper dev->driver.context_dtor(dev, ctx->handle); 309*7f3c3d6fSHasso Tepper DRM_UNLOCK(); 310*7f3c3d6fSHasso Tepper } 311*7f3c3d6fSHasso Tepper 312*7f3c3d6fSHasso Tepper drm_ctxbitmap_free(dev, ctx->handle); 313*7f3c3d6fSHasso Tepper } 314*7f3c3d6fSHasso Tepper 315*7f3c3d6fSHasso Tepper return 0; 316*7f3c3d6fSHasso Tepper } 317