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Diffstat (limited to 'linux-core/drm_compat.c')
| -rw-r--r-- | linux-core/drm_compat.c | 153 |
1 files changed, 0 insertions, 153 deletions
diff --git a/linux-core/drm_compat.c b/linux-core/drm_compat.c deleted file mode 100644 index 3bf9d100..00000000 --- a/linux-core/drm_compat.c +++ /dev/null @@ -1,153 +0,0 @@ -/************************************************************************** - * - * This kernel module is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License as - * published by the Free Software Foundation; either version 2 of the - * License, or (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - * - **************************************************************************/ -/* - * This code provides access to unexported mm kernel features. It is necessary - * to use the new DRM memory manager code with kernels that don't support it - * directly. - * - * Authors: Thomas Hellstrom <thomas-at-tungstengraphics-dot-com> - * Linux kernel mm subsystem authors. - * (Most code taken from there). - */ - -#include "drmP.h" - -#ifdef DRM_IDR_COMPAT_FN -/* only called when idp->lock is held */ -static void __free_layer(struct idr *idp, struct idr_layer *p) -{ - p->ary[0] = idp->id_free; - idp->id_free = p; - idp->id_free_cnt++; -} - -static void free_layer(struct idr *idp, struct idr_layer *p) -{ - unsigned long flags; - - /* - * Depends on the return element being zeroed. - */ - spin_lock_irqsave(&idp->lock, flags); - __free_layer(idp, p); - spin_unlock_irqrestore(&idp->lock, flags); -} - -/** - * idr_for_each - iterate through all stored pointers - * @idp: idr handle - * @fn: function to be called for each pointer - * @data: data passed back to callback function - * - * Iterate over the pointers registered with the given idr. The - * callback function will be called for each pointer currently - * registered, passing the id, the pointer and the data pointer passed - * to this function. It is not safe to modify the idr tree while in - * the callback, so functions such as idr_get_new and idr_remove are - * not allowed. - * - * We check the return of @fn each time. If it returns anything other - * than 0, we break out and return that value. - * -* The caller must serialize idr_find() vs idr_get_new() and idr_remove(). - */ -int idr_for_each(struct idr *idp, - int (*fn)(int id, void *p, void *data), void *data) -{ - int n, id, max, error = 0; - struct idr_layer *p; - struct idr_layer *pa[MAX_LEVEL]; - struct idr_layer **paa = &pa[0]; - - n = idp->layers * IDR_BITS; - p = idp->top; - max = 1 << n; - - id = 0; - while (id < max) { - while (n > 0 && p) { - n -= IDR_BITS; - *paa++ = p; - p = p->ary[(id >> n) & IDR_MASK]; - } - - if (p) { - error = fn(id, (void *)p, data); - if (error) - break; - } - - id += 1 << n; - while (n < fls(id)) { - n += IDR_BITS; - p = *--paa; - } - } - - return error; -} -EXPORT_SYMBOL(idr_for_each); - -/** - * idr_remove_all - remove all ids from the given idr tree - * @idp: idr handle - * - * idr_destroy() only frees up unused, cached idp_layers, but this - * function will remove all id mappings and leave all idp_layers - * unused. - * - * A typical clean-up sequence for objects stored in an idr tree, will - * use idr_for_each() to free all objects, if necessay, then - * idr_remove_all() to remove all ids, and idr_destroy() to free - * up the cached idr_layers. - */ -void idr_remove_all(struct idr *idp) -{ - int n, id, max, error = 0; - struct idr_layer *p; - struct idr_layer *pa[MAX_LEVEL]; - struct idr_layer **paa = &pa[0]; - - n = idp->layers * IDR_BITS; - p = idp->top; - max = 1 << n; - - id = 0; - while (id < max && !error) { - while (n > IDR_BITS && p) { - n -= IDR_BITS; - *paa++ = p; - p = p->ary[(id >> n) & IDR_MASK]; - } - - id += 1 << n; - while (n < fls(id)) { - if (p) { - memset(p, 0, sizeof *p); - free_layer(idp, p); - } - n += IDR_BITS; - p = *--paa; - } - } - idp->top = NULL; - idp->layers = 0; -} -EXPORT_SYMBOL(idr_remove_all); - -#endif /* DRM_IDR_COMPAT_FN */ |