diff options
Diffstat (limited to 'drivers/char/drm/gamma_lists.h')
| -rw-r--r-- | drivers/char/drm/gamma_lists.h | 215 |
1 files changed, 215 insertions, 0 deletions
diff --git a/drivers/char/drm/gamma_lists.h b/drivers/char/drm/gamma_lists.h new file mode 100644 index 00000000000..2d93f412b96 --- /dev/null +++ b/drivers/char/drm/gamma_lists.h @@ -0,0 +1,215 @@ +/* drm_lists.h -- Buffer list handling routines -*- linux-c -*- + * Created: Mon Apr 19 20:54:22 1999 by faith@valinux.com + * + * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. + * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. + * All Rights Reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + * + * Authors: + * Rickard E. (Rik) Faith <faith@valinux.com> + * Gareth Hughes <gareth@valinux.com> + */ + +#include "drmP.h" + + +int DRM(waitlist_create)(drm_waitlist_t *bl, int count) +{ + if (bl->count) return -EINVAL; + + bl->bufs = DRM(alloc)((bl->count + 2) * sizeof(*bl->bufs), + DRM_MEM_BUFLISTS); + + if(!bl->bufs) return -ENOMEM; + memset(bl->bufs, 0, sizeof(*bl->bufs)); + bl->count = count; + bl->rp = bl->bufs; + bl->wp = bl->bufs; + bl->end = &bl->bufs[bl->count+1]; + spin_lock_init(&bl->write_lock); + spin_lock_init(&bl->read_lock); + return 0; +} + +int DRM(waitlist_destroy)(drm_waitlist_t *bl) +{ + if (bl->rp != bl->wp) return -EINVAL; + if (bl->bufs) DRM(free)(bl->bufs, + (bl->count + 2) * sizeof(*bl->bufs), + DRM_MEM_BUFLISTS); + bl->count = 0; + bl->bufs = NULL; + bl->rp = NULL; + bl->wp = NULL; + bl->end = NULL; + return 0; +} + +int DRM(waitlist_put)(drm_waitlist_t *bl, drm_buf_t *buf) +{ + int left; + unsigned long flags; + + left = DRM_LEFTCOUNT(bl); + if (!left) { + DRM_ERROR("Overflow while adding buffer %d from filp %p\n", + buf->idx, buf->filp); + return -EINVAL; + } + buf->list = DRM_LIST_WAIT; + + spin_lock_irqsave(&bl->write_lock, flags); + *bl->wp = buf; + if (++bl->wp >= bl->end) bl->wp = bl->bufs; + spin_unlock_irqrestore(&bl->write_lock, flags); + + return 0; +} + +drm_buf_t *DRM(waitlist_get)(drm_waitlist_t *bl) +{ + drm_buf_t *buf; + unsigned long flags; + + spin_lock_irqsave(&bl->read_lock, flags); + buf = *bl->rp; + if (bl->rp == bl->wp) { + spin_unlock_irqrestore(&bl->read_lock, flags); + return NULL; + } + if (++bl->rp >= bl->end) bl->rp = bl->bufs; + spin_unlock_irqrestore(&bl->read_lock, flags); + + return buf; +} + +int DRM(freelist_create)(drm_freelist_t *bl, int count) +{ + atomic_set(&bl->count, 0); + bl->next = NULL; + init_waitqueue_head(&bl->waiting); + bl->low_mark = 0; + bl->high_mark = 0; + atomic_set(&bl->wfh, 0); + spin_lock_init(&bl->lock); + ++bl->initialized; + return 0; +} + +int DRM(freelist_destroy)(drm_freelist_t *bl) +{ + atomic_set(&bl->count, 0); + bl->next = NULL; + return 0; +} + +int DRM(freelist_put)(drm_device_t *dev, drm_freelist_t *bl, drm_buf_t *buf) +{ + drm_device_dma_t *dma = dev->dma; + + if (!dma) { + DRM_ERROR("No DMA support\n"); + return 1; + } + + if (buf->waiting || buf->pending || buf->list == DRM_LIST_FREE) { + DRM_ERROR("Freed buffer %d: w%d, p%d, l%d\n", + buf->idx, buf->waiting, buf->pending, buf->list); + } + if (!bl) return 1; + buf->list = DRM_LIST_FREE; + + spin_lock(&bl->lock); + buf->next = bl->next; + bl->next = buf; + spin_unlock(&bl->lock); + + atomic_inc(&bl->count); + if (atomic_read(&bl->count) > dma->buf_count) { + DRM_ERROR("%d of %d buffers free after addition of %d\n", + atomic_read(&bl->count), dma->buf_count, buf->idx); + return 1; + } + /* Check for high water mark */ + if (atomic_read(&bl->wfh) && atomic_read(&bl->count)>=bl->high_mark) { + atomic_set(&bl->wfh, 0); + wake_up_interruptible(&bl->waiting); + } + return 0; +} + +static drm_buf_t *DRM(freelist_try)(drm_freelist_t *bl) +{ + drm_buf_t *buf; + + if (!bl) return NULL; + + /* Get buffer */ + spin_lock(&bl->lock); + if (!bl->next) { + spin_unlock(&bl->lock); + return NULL; + } + buf = bl->next; + bl->next = bl->next->next; + spin_unlock(&bl->lock); + + atomic_dec(&bl->count); + buf->next = NULL; + buf->list = DRM_LIST_NONE; + if (buf->waiting || buf->pending) { + DRM_ERROR("Free buffer %d: w%d, p%d, l%d\n", + buf->idx, buf->waiting, buf->pending, buf->list); + } + + return buf; +} + +drm_buf_t *DRM(freelist_get)(drm_freelist_t *bl, int block) +{ + drm_buf_t *buf = NULL; + DECLARE_WAITQUEUE(entry, current); + + if (!bl || !bl->initialized) return NULL; + + /* Check for low water mark */ + if (atomic_read(&bl->count) <= bl->low_mark) /* Became low */ + atomic_set(&bl->wfh, 1); + if (atomic_read(&bl->wfh)) { + if (block) { + add_wait_queue(&bl->waiting, &entry); + for (;;) { + current->state = TASK_INTERRUPTIBLE; + if (!atomic_read(&bl->wfh) + && (buf = DRM(freelist_try)(bl))) break; + schedule(); + if (signal_pending(current)) break; + } + current->state = TASK_RUNNING; + remove_wait_queue(&bl->waiting, &entry); + } + return buf; + } + + return DRM(freelist_try)(bl); +} + |