diff options
Diffstat (limited to 'drivers/char/drm/drm_context.c')
-rw-r--r-- | drivers/char/drm/drm_context.c | 313 |
1 files changed, 159 insertions, 154 deletions
diff --git a/drivers/char/drm/drm_context.c b/drivers/char/drm/drm_context.c index 502892794c1..bd958d69a2a 100644 --- a/drivers/char/drm/drm_context.c +++ b/drivers/char/drm/drm_context.c @@ -1,7 +1,7 @@ /** - * \file drm_context.h + * \file drm_context.c * IOCTLs for generic contexts - * + * * \author Rickard E. (Rik) Faith <faith@valinux.com> * \author Gareth Hughes <gareth@valinux.com> */ @@ -56,25 +56,26 @@ * in drm_device::context_sareas, while holding the drm_device::struct_sem * lock. */ -void drm_ctxbitmap_free( drm_device_t *dev, int ctx_handle ) +void drm_ctxbitmap_free(drm_device_t * dev, int ctx_handle) { - if ( ctx_handle < 0 ) goto failed; - if ( !dev->ctx_bitmap ) goto failed; + if (ctx_handle < 0) + goto failed; + if (!dev->ctx_bitmap) + goto failed; - if ( ctx_handle < DRM_MAX_CTXBITMAP ) { + if (ctx_handle < DRM_MAX_CTXBITMAP) { down(&dev->struct_sem); - clear_bit( ctx_handle, dev->ctx_bitmap ); + clear_bit(ctx_handle, dev->ctx_bitmap); dev->context_sareas[ctx_handle] = NULL; up(&dev->struct_sem); return; } -failed: - DRM_ERROR( "Attempt to free invalid context handle: %d\n", - ctx_handle ); - return; + failed: + DRM_ERROR("Attempt to free invalid context handle: %d\n", ctx_handle); + return; } -/** +/** * Context bitmap allocation. * * \param dev DRM device. @@ -84,29 +85,33 @@ failed: * drm_device::context_sareas to accommodate the new entry while holding the * drm_device::struct_sem lock. */ -static int drm_ctxbitmap_next( drm_device_t *dev ) +static int drm_ctxbitmap_next(drm_device_t * dev) { int bit; - if(!dev->ctx_bitmap) return -1; + if (!dev->ctx_bitmap) + return -1; down(&dev->struct_sem); - bit = find_first_zero_bit( dev->ctx_bitmap, DRM_MAX_CTXBITMAP ); - if ( bit < DRM_MAX_CTXBITMAP ) { - set_bit( bit, dev->ctx_bitmap ); - DRM_DEBUG( "drm_ctxbitmap_next bit : %d\n", bit ); - if((bit+1) > dev->max_context) { - dev->max_context = (bit+1); - if(dev->context_sareas) { + bit = find_first_zero_bit(dev->ctx_bitmap, DRM_MAX_CTXBITMAP); + if (bit < DRM_MAX_CTXBITMAP) { + set_bit(bit, dev->ctx_bitmap); + DRM_DEBUG("drm_ctxbitmap_next bit : %d\n", bit); + if ((bit + 1) > dev->max_context) { + dev->max_context = (bit + 1); + if (dev->context_sareas) { drm_map_t **ctx_sareas; ctx_sareas = drm_realloc(dev->context_sareas, - (dev->max_context - 1) * - sizeof(*dev->context_sareas), - dev->max_context * - sizeof(*dev->context_sareas), - DRM_MEM_MAPS); - if(!ctx_sareas) { + (dev->max_context - + 1) * + sizeof(*dev-> + context_sareas), + dev->max_context * + sizeof(*dev-> + context_sareas), + DRM_MEM_MAPS); + if (!ctx_sareas) { clear_bit(bit, dev->ctx_bitmap); up(&dev->struct_sem); return -1; @@ -115,11 +120,11 @@ static int drm_ctxbitmap_next( drm_device_t *dev ) dev->context_sareas[bit] = NULL; } else { /* max_context == 1 at this point */ - dev->context_sareas = drm_alloc( - dev->max_context * - sizeof(*dev->context_sareas), - DRM_MEM_MAPS); - if(!dev->context_sareas) { + dev->context_sareas = + drm_alloc(dev->max_context * + sizeof(*dev->context_sareas), + DRM_MEM_MAPS); + if (!dev->context_sareas) { clear_bit(bit, dev->ctx_bitmap); up(&dev->struct_sem); return -1; @@ -142,26 +147,26 @@ static int drm_ctxbitmap_next( drm_device_t *dev ) * Allocates and initialize drm_device::ctx_bitmap and drm_device::context_sareas, while holding * the drm_device::struct_sem lock. */ -int drm_ctxbitmap_init( drm_device_t *dev ) +int drm_ctxbitmap_init(drm_device_t * dev) { int i; - int temp; + int temp; down(&dev->struct_sem); - dev->ctx_bitmap = (unsigned long *) drm_alloc( PAGE_SIZE, - DRM_MEM_CTXBITMAP ); - if ( dev->ctx_bitmap == NULL ) { + dev->ctx_bitmap = (unsigned long *)drm_alloc(PAGE_SIZE, + DRM_MEM_CTXBITMAP); + if (dev->ctx_bitmap == NULL) { up(&dev->struct_sem); return -ENOMEM; } - memset( (void *)dev->ctx_bitmap, 0, PAGE_SIZE ); + memset((void *)dev->ctx_bitmap, 0, PAGE_SIZE); dev->context_sareas = NULL; dev->max_context = -1; up(&dev->struct_sem); - for ( i = 0 ; i < DRM_RESERVED_CONTEXTS ; i++ ) { - temp = drm_ctxbitmap_next( dev ); - DRM_DEBUG( "drm_ctxbitmap_init : %d\n", temp ); + for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) { + temp = drm_ctxbitmap_next(dev); + DRM_DEBUG("drm_ctxbitmap_init : %d\n", temp); } return 0; @@ -175,14 +180,14 @@ int drm_ctxbitmap_init( drm_device_t *dev ) * Frees drm_device::ctx_bitmap and drm_device::context_sareas, while holding * the drm_device::struct_sem lock. */ -void drm_ctxbitmap_cleanup( drm_device_t *dev ) +void drm_ctxbitmap_cleanup(drm_device_t * dev) { down(&dev->struct_sem); - if( dev->context_sareas ) drm_free( dev->context_sareas, - sizeof(*dev->context_sareas) * - dev->max_context, - DRM_MEM_MAPS ); - drm_free( (void *)dev->ctx_bitmap, PAGE_SIZE, DRM_MEM_CTXBITMAP ); + if (dev->context_sareas) + drm_free(dev->context_sareas, + sizeof(*dev->context_sareas) * + dev->max_context, DRM_MEM_MAPS); + drm_free((void *)dev->ctx_bitmap, PAGE_SIZE, DRM_MEM_CTXBITMAP); up(&dev->struct_sem); } @@ -194,7 +199,7 @@ void drm_ctxbitmap_cleanup( drm_device_t *dev ) /** * Get per-context SAREA. - * + * * \param inode device inode. * \param filp file pointer. * \param cmd command. @@ -205,10 +210,10 @@ void drm_ctxbitmap_cleanup( drm_device_t *dev ) * returns its handle. */ int drm_getsareactx(struct inode *inode, struct file *filp, - unsigned int cmd, unsigned long arg) + unsigned int cmd, unsigned long arg) { - drm_file_t *priv = filp->private_data; - drm_device_t *dev = priv->head->dev; + drm_file_t *priv = filp->private_data; + drm_device_t *dev = priv->head->dev; drm_ctx_priv_map_t __user *argp = (void __user *)arg; drm_ctx_priv_map_t request; drm_map_t *map; @@ -218,7 +223,8 @@ int drm_getsareactx(struct inode *inode, struct file *filp, return -EFAULT; down(&dev->struct_sem); - if (dev->max_context < 0 || request.ctx_id >= (unsigned) dev->max_context) { + if (dev->max_context < 0 + || request.ctx_id >= (unsigned)dev->max_context) { up(&dev->struct_sem); return -EINVAL; } @@ -226,17 +232,17 @@ int drm_getsareactx(struct inode *inode, struct file *filp, map = dev->context_sareas[request.ctx_id]; up(&dev->struct_sem); - request.handle = 0; - list_for_each_entry(_entry, &dev->maplist->head,head) { + request.handle = NULL; + list_for_each_entry(_entry, &dev->maplist->head, head) { if (_entry->map == map) { - request.handle = (void *)(unsigned long)_entry->user_token; + request.handle = + (void *)(unsigned long)_entry->user_token; break; } } - if (request.handle == 0) + if (request.handle == NULL) return -EINVAL; - if (copy_to_user(argp, &request, sizeof(request))) return -EFAULT; return 0; @@ -244,7 +250,7 @@ int drm_getsareactx(struct inode *inode, struct file *filp, /** * Set per-context SAREA. - * + * * \param inode device inode. * \param filp file pointer. * \param cmd command. @@ -255,37 +261,37 @@ int drm_getsareactx(struct inode *inode, struct file *filp, * drm_device::context_sareas with it. */ int drm_setsareactx(struct inode *inode, struct file *filp, - unsigned int cmd, unsigned long arg) + unsigned int cmd, unsigned long arg) { - drm_file_t *priv = filp->private_data; - drm_device_t *dev = priv->head->dev; + drm_file_t *priv = filp->private_data; + drm_device_t *dev = priv->head->dev; drm_ctx_priv_map_t request; drm_map_t *map = NULL; drm_map_list_t *r_list = NULL; struct list_head *list; if (copy_from_user(&request, - (drm_ctx_priv_map_t __user *)arg, - sizeof(request))) + (drm_ctx_priv_map_t __user *) arg, sizeof(request))) return -EFAULT; down(&dev->struct_sem); list_for_each(list, &dev->maplist->head) { r_list = list_entry(list, drm_map_list_t, head); if (r_list->map - && r_list->user_token == (unsigned long) request.handle) + && r_list->user_token == (unsigned long)request.handle) goto found; } -bad: + bad: up(&dev->struct_sem); return -EINVAL; -found: + found: map = r_list->map; - if (!map) goto bad; + if (!map) + goto bad; if (dev->max_context < 0) goto bad; - if (request.ctx_id >= (unsigned) dev->max_context) + if (request.ctx_id >= (unsigned)dev->max_context) goto bad; dev->context_sareas[request.ctx_id] = map; up(&dev->struct_sem); @@ -308,22 +314,21 @@ found: * * Attempt to set drm_device::context_flag. */ -static int drm_context_switch( drm_device_t *dev, int old, int new ) +static int drm_context_switch(drm_device_t * dev, int old, int new) { - if ( test_and_set_bit( 0, &dev->context_flag ) ) { - DRM_ERROR( "Reentering -- FIXME\n" ); - return -EBUSY; - } - + if (test_and_set_bit(0, &dev->context_flag)) { + DRM_ERROR("Reentering -- FIXME\n"); + return -EBUSY; + } - DRM_DEBUG( "Context switch from %d to %d\n", old, new ); + DRM_DEBUG("Context switch from %d to %d\n", old, new); - if ( new == dev->last_context ) { - clear_bit( 0, &dev->context_flag ); - return 0; - } + if (new == dev->last_context) { + clear_bit(0, &dev->context_flag); + return 0; + } - return 0; + return 0; } /** @@ -337,22 +342,22 @@ static int drm_context_switch( drm_device_t *dev, int old, int new ) * hardware lock is held, clears the drm_device::context_flag and wakes up * drm_device::context_wait. */ -static int drm_context_switch_complete( drm_device_t *dev, int new ) +static int drm_context_switch_complete(drm_device_t * dev, int new) { - dev->last_context = new; /* PRE/POST: This is the _only_ writer. */ - dev->last_switch = jiffies; + dev->last_context = new; /* PRE/POST: This is the _only_ writer. */ + dev->last_switch = jiffies; - if ( !_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock) ) { - DRM_ERROR( "Lock isn't held after context switch\n" ); - } + if (!_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)) { + DRM_ERROR("Lock isn't held after context switch\n"); + } - /* If a context switch is ever initiated - when the kernel holds the lock, release - that lock here. */ - clear_bit( 0, &dev->context_flag ); - wake_up( &dev->context_wait ); + /* If a context switch is ever initiated + when the kernel holds the lock, release + that lock here. */ + clear_bit(0, &dev->context_flag); + wake_up(&dev->context_wait); - return 0; + return 0; } /** @@ -364,29 +369,28 @@ static int drm_context_switch_complete( drm_device_t *dev, int new ) * \param arg user argument pointing to a drm_ctx_res structure. * \return zero on success or a negative number on failure. */ -int drm_resctx( struct inode *inode, struct file *filp, - unsigned int cmd, unsigned long arg ) +int drm_resctx(struct inode *inode, struct file *filp, + unsigned int cmd, unsigned long arg) { drm_ctx_res_t res; drm_ctx_t __user *argp = (void __user *)arg; drm_ctx_t ctx; int i; - if ( copy_from_user( &res, argp, sizeof(res) ) ) + if (copy_from_user(&res, argp, sizeof(res))) return -EFAULT; - if ( res.count >= DRM_RESERVED_CONTEXTS ) { - memset( &ctx, 0, sizeof(ctx) ); - for ( i = 0 ; i < DRM_RESERVED_CONTEXTS ; i++ ) { + if (res.count >= DRM_RESERVED_CONTEXTS) { + memset(&ctx, 0, sizeof(ctx)); + for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) { ctx.handle = i; - if ( copy_to_user( &res.contexts[i], - &ctx, sizeof(ctx) ) ) + if (copy_to_user(&res.contexts[i], &ctx, sizeof(ctx))) return -EFAULT; } } res.count = DRM_RESERVED_CONTEXTS; - if ( copy_to_user( argp, &res, sizeof(res) ) ) + if (copy_to_user(argp, &res, sizeof(res))) return -EFAULT; return 0; } @@ -402,58 +406,60 @@ int drm_resctx( struct inode *inode, struct file *filp, * * Get a new handle for the context and copy to userspace. */ -int drm_addctx( struct inode *inode, struct file *filp, - unsigned int cmd, unsigned long arg ) +int drm_addctx(struct inode *inode, struct file *filp, + unsigned int cmd, unsigned long arg) { drm_file_t *priv = filp->private_data; drm_device_t *dev = priv->head->dev; - drm_ctx_list_t * ctx_entry; + drm_ctx_list_t *ctx_entry; drm_ctx_t __user *argp = (void __user *)arg; drm_ctx_t ctx; - if ( copy_from_user( &ctx, argp, sizeof(ctx) ) ) + if (copy_from_user(&ctx, argp, sizeof(ctx))) return -EFAULT; - ctx.handle = drm_ctxbitmap_next( dev ); - if ( ctx.handle == DRM_KERNEL_CONTEXT ) { - /* Skip kernel's context and get a new one. */ - ctx.handle = drm_ctxbitmap_next( dev ); + ctx.handle = drm_ctxbitmap_next(dev); + if (ctx.handle == DRM_KERNEL_CONTEXT) { + /* Skip kernel's context and get a new one. */ + ctx.handle = drm_ctxbitmap_next(dev); } - DRM_DEBUG( "%d\n", ctx.handle ); - if ( ctx.handle == -1 ) { - DRM_DEBUG( "Not enough free contexts.\n" ); - /* Should this return -EBUSY instead? */ + DRM_DEBUG("%d\n", ctx.handle); + if (ctx.handle == -1) { + DRM_DEBUG("Not enough free contexts.\n"); + /* Should this return -EBUSY instead? */ return -ENOMEM; } - if ( ctx.handle != DRM_KERNEL_CONTEXT ) - { + if (ctx.handle != DRM_KERNEL_CONTEXT) { if (dev->driver->context_ctor) - dev->driver->context_ctor(dev, ctx.handle); + if (!dev->driver->context_ctor(dev, ctx.handle)) { + DRM_DEBUG( "Running out of ctxs or memory.\n"); + return -ENOMEM; + } } - ctx_entry = drm_alloc( sizeof(*ctx_entry), DRM_MEM_CTXLIST ); - if ( !ctx_entry ) { + ctx_entry = drm_alloc(sizeof(*ctx_entry), DRM_MEM_CTXLIST); + if (!ctx_entry) { DRM_DEBUG("out of memory\n"); return -ENOMEM; } - INIT_LIST_HEAD( &ctx_entry->head ); + INIT_LIST_HEAD(&ctx_entry->head); ctx_entry->handle = ctx.handle; ctx_entry->tag = priv; - down( &dev->ctxlist_sem ); - list_add( &ctx_entry->head, &dev->ctxlist->head ); + down(&dev->ctxlist_sem); + list_add(&ctx_entry->head, &dev->ctxlist->head); ++dev->ctx_count; - up( &dev->ctxlist_sem ); + up(&dev->ctxlist_sem); - if ( copy_to_user( argp, &ctx, sizeof(ctx) ) ) + if (copy_to_user(argp, &ctx, sizeof(ctx))) return -EFAULT; return 0; } -int drm_modctx( struct inode *inode, struct file *filp, - unsigned int cmd, unsigned long arg ) +int drm_modctx(struct inode *inode, struct file *filp, + unsigned int cmd, unsigned long arg) { /* This does nothing */ return 0; @@ -468,19 +474,19 @@ int drm_modctx( struct inode *inode, struct file *filp, * \param arg user argument pointing to a drm_ctx structure. * \return zero on success or a negative number on failure. */ -int drm_getctx( struct inode *inode, struct file *filp, - unsigned int cmd, unsigned long arg ) +int drm_getctx(struct inode *inode, struct file *filp, + unsigned int cmd, unsigned long arg) { drm_ctx_t __user *argp = (void __user *)arg; drm_ctx_t ctx; - if ( copy_from_user( &ctx, argp, sizeof(ctx) ) ) + if (copy_from_user(&ctx, argp, sizeof(ctx))) return -EFAULT; /* This is 0, because we don't handle any context flags */ ctx.flags = 0; - if ( copy_to_user( argp, &ctx, sizeof(ctx) ) ) + if (copy_to_user(argp, &ctx, sizeof(ctx))) return -EFAULT; return 0; } @@ -496,18 +502,18 @@ int drm_getctx( struct inode *inode, struct file *filp, * * Calls context_switch(). */ -int drm_switchctx( struct inode *inode, struct file *filp, - unsigned int cmd, unsigned long arg ) +int drm_switchctx(struct inode *inode, struct file *filp, + unsigned int cmd, unsigned long arg) { drm_file_t *priv = filp->private_data; drm_device_t *dev = priv->head->dev; drm_ctx_t ctx; - if ( copy_from_user( &ctx, (drm_ctx_t __user *)arg, sizeof(ctx) ) ) + if (copy_from_user(&ctx, (drm_ctx_t __user *) arg, sizeof(ctx))) return -EFAULT; - DRM_DEBUG( "%d\n", ctx.handle ); - return drm_context_switch( dev, dev->last_context, ctx.handle ); + DRM_DEBUG("%d\n", ctx.handle); + return drm_context_switch(dev, dev->last_context, ctx.handle); } /** @@ -521,18 +527,18 @@ int drm_switchctx( struct inode *inode, struct file *filp, * * Calls context_switch_complete(). */ -int drm_newctx( struct inode *inode, struct file *filp, - unsigned int cmd, unsigned long arg ) +int drm_newctx(struct inode *inode, struct file *filp, + unsigned int cmd, unsigned long arg) { drm_file_t *priv = filp->private_data; drm_device_t *dev = priv->head->dev; drm_ctx_t ctx; - if ( copy_from_user( &ctx, (drm_ctx_t __user *)arg, sizeof(ctx) ) ) + if (copy_from_user(&ctx, (drm_ctx_t __user *) arg, sizeof(ctx))) return -EFAULT; - DRM_DEBUG( "%d\n", ctx.handle ); - drm_context_switch_complete( dev, ctx.handle ); + DRM_DEBUG("%d\n", ctx.handle); + drm_context_switch_complete(dev, ctx.handle); return 0; } @@ -548,42 +554,41 @@ int drm_newctx( struct inode *inode, struct file *filp, * * If not the special kernel context, calls ctxbitmap_free() to free the specified context. */ -int drm_rmctx( struct inode *inode, struct file *filp, - unsigned int cmd, unsigned long arg ) +int drm_rmctx(struct inode *inode, struct file *filp, + unsigned int cmd, unsigned long arg) { drm_file_t *priv = filp->private_data; drm_device_t *dev = priv->head->dev; drm_ctx_t ctx; - if ( copy_from_user( &ctx, (drm_ctx_t __user *)arg, sizeof(ctx) ) ) + if (copy_from_user(&ctx, (drm_ctx_t __user *) arg, sizeof(ctx))) return -EFAULT; - DRM_DEBUG( "%d\n", ctx.handle ); - if ( ctx.handle == DRM_KERNEL_CONTEXT + 1 ) { + DRM_DEBUG("%d\n", ctx.handle); + if (ctx.handle == DRM_KERNEL_CONTEXT + 1) { priv->remove_auth_on_close = 1; } - if ( ctx.handle != DRM_KERNEL_CONTEXT ) { + if (ctx.handle != DRM_KERNEL_CONTEXT) { if (dev->driver->context_dtor) dev->driver->context_dtor(dev, ctx.handle); - drm_ctxbitmap_free( dev, ctx.handle ); + drm_ctxbitmap_free(dev, ctx.handle); } - down( &dev->ctxlist_sem ); - if ( !list_empty( &dev->ctxlist->head ) ) { + down(&dev->ctxlist_sem); + if (!list_empty(&dev->ctxlist->head)) { drm_ctx_list_t *pos, *n; - list_for_each_entry_safe( pos, n, &dev->ctxlist->head, head ) { - if ( pos->handle == ctx.handle ) { - list_del( &pos->head ); - drm_free( pos, sizeof(*pos), DRM_MEM_CTXLIST ); + list_for_each_entry_safe(pos, n, &dev->ctxlist->head, head) { + if (pos->handle == ctx.handle) { + list_del(&pos->head); + drm_free(pos, sizeof(*pos), DRM_MEM_CTXLIST); --dev->ctx_count; } } } - up( &dev->ctxlist_sem ); + up(&dev->ctxlist_sem); return 0; } /*@}*/ - |