diff options
Diffstat (limited to 'bsd/drm_lists.h')
| -rw-r--r-- | bsd/drm_lists.h | 236 |
1 files changed, 236 insertions, 0 deletions
diff --git a/bsd/drm_lists.h b/bsd/drm_lists.h new file mode 100644 index 00000000..ea6d34a7 --- /dev/null +++ b/bsd/drm_lists.h @@ -0,0 +1,236 @@ +/* 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> + */ + +#define __NO_VERSION__ +#include "drmP.h" + +#if __HAVE_DMA_WAITLIST + +int DRM(waitlist_create)(drm_waitlist_t *bl, int count) +{ + if (bl->count) + DRM_OS_RETURN( EINVAL ); + + bl->bufs = DRM(alloc)((bl->count + 2) * sizeof(*bl->bufs), + DRM_MEM_BUFLISTS); + + if(!bl->bufs) DRM_OS_RETURN(ENOMEM); + + bl->count = count; + bl->rp = bl->bufs; + bl->wp = bl->bufs; + bl->end = &bl->bufs[bl->count+1]; + DRM_OS_SPININIT( bl->write_lock, "writelock" ); + DRM_OS_SPININIT( bl->read_lock, "readlock" ); + return 0; +} + +int DRM(waitlist_destroy)(drm_waitlist_t *bl) +{ + if (bl->rp != bl->wp) + DRM_OS_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; + int s; + left = DRM_LEFTCOUNT(bl); + if (!left) { + DRM_ERROR("Overflow while adding buffer %d from pid %d\n", + buf->idx, buf->pid); + DRM_OS_RETURN( EINVAL ); + } +#if __HAVE_DMA_HISTOGRAM + getnanotime(&buf->time_queued); +#endif + buf->list = DRM_LIST_WAIT; + + DRM_OS_SPINLOCK(&bl->write_lock); + s = spldrm(); + *bl->wp = buf; + if (++bl->wp >= bl->end) bl->wp = bl->bufs; + splx(s); + DRM_OS_SPINUNLOCK(&bl->write_lock); + + return 0; +} + +drm_buf_t *DRM(waitlist_get)(drm_waitlist_t *bl) +{ + drm_buf_t *buf; + int s; + + DRM_OS_SPINLOCK(&bl->read_lock); + s = spldrm(); + buf = *bl->rp; + if (bl->rp == bl->wp) { + splx(s); + DRM_OS_SPINUNLOCK(&bl->read_lock); + return NULL; + } + if (++bl->rp >= bl->end) bl->rp = bl->bufs; + splx(s); + DRM_OS_SPINUNLOCK(&bl->read_lock); + + return buf; +} + +#endif /* __HAVE_DMA_WAITLIST */ + + +#if __HAVE_DMA_FREELIST + +int DRM(freelist_create)(drm_freelist_t *bl, int count) +{ + atomic_set(&bl->count, 0); + bl->next = NULL; + bl->waiting = 0; + + bl->low_mark = 0; + bl->high_mark = 0; + atomic_set(&bl->wfh, 0); + DRM_OS_SPININIT( bl->lock, "freelistlock" ); + ++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; +#if __HAVE_DMA_HISTOGRAM + getnanotime(&buf->time_queued); + DRM(histogram_compute)(dev, buf); +#endif + buf->list = DRM_LIST_FREE; + + DRM_OS_SPINLOCK( &bl->lock ); + buf->next = bl->next; + bl->next = buf; + DRM_OS_SPINUNLOCK( &bl->lock ); + + atomic_inc(&bl->count); + if (atomic_read(&bl->count) > dma->buf_count) { + DRM_ERROR("%ld of %d buffers free after addition of %d\n", + (unsigned long)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); + DRM_OS_WAKEUP_INT(&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 */ + DRM_OS_SPINLOCK(&bl->lock); + if (!bl->next) { + DRM_OS_SPINUNLOCK(&bl->lock); + return NULL; + } + buf = bl->next; + bl->next = bl->next->next; + DRM_OS_SPINUNLOCK(&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; + int error; + + 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) { + for (;;) { + if (!atomic_read(&bl->wfh) + && (buf = DRM(freelist_try(bl)))) break; + error = tsleep(&bl->waiting, PZERO|PCATCH, + "drmfg", 0); + if (error) + break; + } + } + return buf; + } + + return DRM(freelist_try)(bl); +} + +#endif /* __HAVE_DMA_FREELIST */ |