From 360475376c5a597caf4a981c934a6b0d783fa94d Mon Sep 17 00:00:00 2001 From: Gareth Hughes Date: Thu, 15 Feb 2001 08:12:14 +0000 Subject: Merge mga-1-0-0-branch into trunk. --- linux/dma.c | 543 ------------------------------------------------------------ 1 file changed, 543 deletions(-) delete mode 100644 linux/dma.c (limited to 'linux/dma.c') diff --git a/linux/dma.c b/linux/dma.c deleted file mode 100644 index 56dd2441..00000000 --- a/linux/dma.c +++ /dev/null @@ -1,543 +0,0 @@ -/* dma.c -- DMA IOCTL and function support -*- linux-c -*- - * Created: Fri Mar 19 14:30:16 1999 by faith@precisioninsight.com - * - * Copyright 1999, 2000 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 - * PRECISION INSIGHT 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 - * - */ - -#define __NO_VERSION__ -#include "drmP.h" - -#include /* For task queue support */ - -void drm_dma_setup(drm_device_t *dev) -{ - int i; - - dev->dma = drm_alloc(sizeof(*dev->dma), DRM_MEM_DRIVER); - memset(dev->dma, 0, sizeof(*dev->dma)); - for (i = 0; i <= DRM_MAX_ORDER; i++) - memset(&dev->dma->bufs[i], 0, sizeof(dev->dma->bufs[0])); -} - -void drm_dma_takedown(drm_device_t *dev) -{ - drm_device_dma_t *dma = dev->dma; - int i, j; - - if (!dma) return; - - /* Clear dma buffers */ - for (i = 0; i <= DRM_MAX_ORDER; i++) { - if (dma->bufs[i].seg_count) { - DRM_DEBUG("order %d: buf_count = %d," - " seg_count = %d\n", - i, - dma->bufs[i].buf_count, - dma->bufs[i].seg_count); - for (j = 0; j < dma->bufs[i].seg_count; j++) { - drm_free_pages(dma->bufs[i].seglist[j], - dma->bufs[i].page_order, - DRM_MEM_DMA); - } - drm_free(dma->bufs[i].seglist, - dma->bufs[i].seg_count - * sizeof(*dma->bufs[0].seglist), - DRM_MEM_SEGS); - } - if(dma->bufs[i].buf_count) { - for(j = 0; j < dma->bufs[i].buf_count; j++) { - if(dma->bufs[i].buflist[j].dev_private) { - drm_free(dma->bufs[i].buflist[j].dev_private, - dma->bufs[i].buflist[j].dev_priv_size, - DRM_MEM_BUFS); - } - } - drm_free(dma->bufs[i].buflist, - dma->bufs[i].buf_count * - sizeof(*dma->bufs[0].buflist), - DRM_MEM_BUFS); - drm_freelist_destroy(&dma->bufs[i].freelist); - } - } - - if (dma->buflist) { - drm_free(dma->buflist, - dma->buf_count * sizeof(*dma->buflist), - DRM_MEM_BUFS); - } - - if (dma->pagelist) { - drm_free(dma->pagelist, - dma->page_count * sizeof(*dma->pagelist), - DRM_MEM_PAGES); - } - drm_free(dev->dma, sizeof(*dev->dma), DRM_MEM_DRIVER); - dev->dma = NULL; -} - -#if DRM_DMA_HISTOGRAM -/* This is slow, but is useful for debugging. */ -int drm_histogram_slot(unsigned long count) -{ - int value = DRM_DMA_HISTOGRAM_INITIAL; - int slot; - - for (slot = 0; - slot < DRM_DMA_HISTOGRAM_SLOTS; - ++slot, value = DRM_DMA_HISTOGRAM_NEXT(value)) { - if (count < value) return slot; - } - return DRM_DMA_HISTOGRAM_SLOTS - 1; -} - -void drm_histogram_compute(drm_device_t *dev, drm_buf_t *buf) -{ - cycles_t queued_to_dispatched; - cycles_t dispatched_to_completed; - cycles_t completed_to_freed; - int q2d, d2c, c2f, q2c, q2f; - - if (buf->time_queued) { - queued_to_dispatched = (buf->time_dispatched - - buf->time_queued); - dispatched_to_completed = (buf->time_completed - - buf->time_dispatched); - completed_to_freed = (buf->time_freed - - buf->time_completed); - - q2d = drm_histogram_slot(queued_to_dispatched); - d2c = drm_histogram_slot(dispatched_to_completed); - c2f = drm_histogram_slot(completed_to_freed); - - q2c = drm_histogram_slot(queued_to_dispatched - + dispatched_to_completed); - q2f = drm_histogram_slot(queued_to_dispatched - + dispatched_to_completed - + completed_to_freed); - - atomic_inc(&dev->histo.total); - atomic_inc(&dev->histo.queued_to_dispatched[q2d]); - atomic_inc(&dev->histo.dispatched_to_completed[d2c]); - atomic_inc(&dev->histo.completed_to_freed[c2f]); - - atomic_inc(&dev->histo.queued_to_completed[q2c]); - atomic_inc(&dev->histo.queued_to_freed[q2f]); - - } - buf->time_queued = 0; - buf->time_dispatched = 0; - buf->time_completed = 0; - buf->time_freed = 0; -} -#endif - -void drm_free_buffer(drm_device_t *dev, drm_buf_t *buf) -{ - drm_device_dma_t *dma = dev->dma; - - if (!buf) return; - - buf->waiting = 0; - buf->pending = 0; - buf->pid = 0; - buf->used = 0; -#if DRM_DMA_HISTOGRAM - buf->time_completed = get_cycles(); -#endif - if (waitqueue_active(&buf->dma_wait)) { - wake_up_interruptible(&buf->dma_wait); - } else { - /* If processes are waiting, the last one - to wake will put the buffer on the free - list. If no processes are waiting, we - put the buffer on the freelist here. */ - drm_freelist_put(dev, &dma->bufs[buf->order].freelist, buf); - } -} - -void drm_reclaim_buffers(drm_device_t *dev, pid_t pid) -{ - drm_device_dma_t *dma = dev->dma; - int i; - - if (!dma) return; - for (i = 0; i < dma->buf_count; i++) { - if (dma->buflist[i]->pid == pid) { - switch (dma->buflist[i]->list) { - case DRM_LIST_NONE: - drm_free_buffer(dev, dma->buflist[i]); - break; - case DRM_LIST_WAIT: - dma->buflist[i]->list = DRM_LIST_RECLAIM; - break; - default: - /* Buffer already on hardware. */ - break; - } - } - } -} - -int drm_context_switch(drm_device_t *dev, int old, int new) -{ - char buf[64]; - drm_queue_t *q; - - atomic_inc(&dev->total_ctx); - - if (test_and_set_bit(0, &dev->context_flag)) { - DRM_ERROR("Reentering -- FIXME\n"); - return -EBUSY; - } - -#if DRM_DMA_HISTOGRAM - dev->ctx_start = get_cycles(); -#endif - - DRM_DEBUG("Context switch from %d to %d\n", old, new); - - if (new >= dev->queue_count) { - clear_bit(0, &dev->context_flag); - return -EINVAL; - } - - if (new == dev->last_context) { - clear_bit(0, &dev->context_flag); - return 0; - } - - q = dev->queuelist[new]; - atomic_inc(&q->use_count); - if (atomic_read(&q->use_count) == 1) { - atomic_dec(&q->use_count); - clear_bit(0, &dev->context_flag); - return -EINVAL; - } - - if (drm_flags & DRM_FLAG_NOCTX) { - drm_context_switch_complete(dev, new); - } else { - sprintf(buf, "C %d %d\n", old, new); - drm_write_string(dev, buf); - } - - atomic_dec(&q->use_count); - - return 0; -} - -int drm_context_switch_complete(drm_device_t *dev, int new) -{ - drm_device_dma_t *dma = dev->dma; - - 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 (!dma || !(dma->next_buffer && dma->next_buffer->while_locked)) { - if (drm_lock_free(dev, &dev->lock.hw_lock->lock, - DRM_KERNEL_CONTEXT)) { - DRM_ERROR("Cannot free lock\n"); - } - } - -#if DRM_DMA_HISTOGRAM - atomic_inc(&dev->histo.ctx[drm_histogram_slot(get_cycles() - - dev->ctx_start)]); - -#endif - clear_bit(0, &dev->context_flag); - wake_up_interruptible(&dev->context_wait); - - return 0; -} - -void drm_clear_next_buffer(drm_device_t *dev) -{ - drm_device_dma_t *dma = dev->dma; - - dma->next_buffer = NULL; - if (dma->next_queue && !DRM_BUFCOUNT(&dma->next_queue->waitlist)) { - wake_up_interruptible(&dma->next_queue->flush_queue); - } - dma->next_queue = NULL; -} - - -int drm_select_queue(drm_device_t *dev, void (*wrapper)(unsigned long)) -{ - int i; - int candidate = -1; - int j = jiffies; - - if (!dev) { - DRM_ERROR("No device\n"); - return -1; - } - if (!dev->queuelist || !dev->queuelist[DRM_KERNEL_CONTEXT]) { - /* This only happens between the time the - interrupt is initialized and the time - the queues are initialized. */ - return -1; - } - - /* Doing "while locked" DMA? */ - if (DRM_WAITCOUNT(dev, DRM_KERNEL_CONTEXT)) { - return DRM_KERNEL_CONTEXT; - } - - /* If there are buffers on the last_context - queue, and we have not been executing - this context very long, continue to - execute this context. */ - if (dev->last_switch <= j - && dev->last_switch + DRM_TIME_SLICE > j - && DRM_WAITCOUNT(dev, dev->last_context)) { - return dev->last_context; - } - - /* Otherwise, find a candidate */ - for (i = dev->last_checked + 1; i < dev->queue_count; i++) { - if (DRM_WAITCOUNT(dev, i)) { - candidate = dev->last_checked = i; - break; - } - } - - if (candidate < 0) { - for (i = 0; i < dev->queue_count; i++) { - if (DRM_WAITCOUNT(dev, i)) { - candidate = dev->last_checked = i; - break; - } - } - } - - if (wrapper - && candidate >= 0 - && candidate != dev->last_context - && dev->last_switch <= j - && dev->last_switch + DRM_TIME_SLICE > j) { - if (dev->timer.expires != dev->last_switch + DRM_TIME_SLICE) { - del_timer(&dev->timer); - dev->timer.function = wrapper; - dev->timer.data = (unsigned long)dev; - dev->timer.expires = dev->last_switch+DRM_TIME_SLICE; - add_timer(&dev->timer); - } - return -1; - } - - return candidate; -} - - -int drm_dma_enqueue(drm_device_t *dev, drm_dma_t *d) -{ - int i; - drm_queue_t *q; - drm_buf_t *buf; - int idx; - int while_locked = 0; - drm_device_dma_t *dma = dev->dma; - DECLARE_WAITQUEUE(entry, current); - - DRM_DEBUG("%d\n", d->send_count); - - if (d->flags & _DRM_DMA_WHILE_LOCKED) { - int context = dev->lock.hw_lock->lock; - - if (!_DRM_LOCK_IS_HELD(context)) { - DRM_ERROR("No lock held during \"while locked\"" - " request\n"); - return -EINVAL; - } - if (d->context != _DRM_LOCKING_CONTEXT(context) - && _DRM_LOCKING_CONTEXT(context) != DRM_KERNEL_CONTEXT) { - DRM_ERROR("Lock held by %d while %d makes" - " \"while locked\" request\n", - _DRM_LOCKING_CONTEXT(context), - d->context); - return -EINVAL; - } - q = dev->queuelist[DRM_KERNEL_CONTEXT]; - while_locked = 1; - } else { - q = dev->queuelist[d->context]; - } - - - atomic_inc(&q->use_count); - if (atomic_read(&q->block_write)) { - add_wait_queue(&q->write_queue, &entry); - atomic_inc(&q->block_count); - for (;;) { - current->state = TASK_INTERRUPTIBLE; - if (!atomic_read(&q->block_write)) break; - schedule(); - if (signal_pending(current)) { - atomic_dec(&q->use_count); - remove_wait_queue(&q->write_queue, &entry); - return -EINTR; - } - } - atomic_dec(&q->block_count); - current->state = TASK_RUNNING; - remove_wait_queue(&q->write_queue, &entry); - } - - for (i = 0; i < d->send_count; i++) { - idx = d->send_indices[i]; - if (idx < 0 || idx >= dma->buf_count) { - atomic_dec(&q->use_count); - DRM_ERROR("Index %d (of %d max)\n", - d->send_indices[i], dma->buf_count - 1); - return -EINVAL; - } - buf = dma->buflist[ idx ]; - if (buf->pid != current->pid) { - atomic_dec(&q->use_count); - DRM_ERROR("Process %d using buffer owned by %d\n", - current->pid, buf->pid); - return -EINVAL; - } - if (buf->list != DRM_LIST_NONE) { - atomic_dec(&q->use_count); - DRM_ERROR("Process %d using buffer %d on list %d\n", - current->pid, buf->idx, buf->list); - } - buf->used = d->send_sizes[i]; - buf->while_locked = while_locked; - buf->context = d->context; - if (!buf->used) { - DRM_ERROR("Queueing 0 length buffer\n"); - } - if (buf->pending) { - atomic_dec(&q->use_count); - DRM_ERROR("Queueing pending buffer:" - " buffer %d, offset %d\n", - d->send_indices[i], i); - return -EINVAL; - } - if (buf->waiting) { - atomic_dec(&q->use_count); - DRM_ERROR("Queueing waiting buffer:" - " buffer %d, offset %d\n", - d->send_indices[i], i); - return -EINVAL; - } - buf->waiting = 1; - if (atomic_read(&q->use_count) == 1 - || atomic_read(&q->finalization)) { - drm_free_buffer(dev, buf); - } else { - drm_waitlist_put(&q->waitlist, buf); - atomic_inc(&q->total_queued); - } - } - atomic_dec(&q->use_count); - - return 0; -} - -static int drm_dma_get_buffers_of_order(drm_device_t *dev, drm_dma_t *d, - int order) -{ - int i; - drm_buf_t *buf; - drm_device_dma_t *dma = dev->dma; - - for (i = d->granted_count; i < d->request_count; i++) { - buf = drm_freelist_get(&dma->bufs[order].freelist, - d->flags & _DRM_DMA_WAIT); - if (!buf) break; - if (buf->pending || buf->waiting) { - DRM_ERROR("Free buffer %d in use by %d (w%d, p%d)\n", - buf->idx, - buf->pid, - buf->waiting, - buf->pending); - } - buf->pid = current->pid; - if (copy_to_user(&d->request_indices[i], - &buf->idx, - sizeof(buf->idx))) - return -EFAULT; - - if (copy_to_user(&d->request_sizes[i], - &buf->total, - sizeof(buf->total))) - return -EFAULT; - - ++d->granted_count; - } - return 0; -} - - -int drm_dma_get_buffers(drm_device_t *dev, drm_dma_t *dma) -{ - int order; - int retcode = 0; - int tmp_order; - - order = drm_order(dma->request_size); - - dma->granted_count = 0; - retcode = drm_dma_get_buffers_of_order(dev, dma, order); - - if (dma->granted_count < dma->request_count - && (dma->flags & _DRM_DMA_SMALLER_OK)) { - for (tmp_order = order - 1; - !retcode - && dma->granted_count < dma->request_count - && tmp_order >= DRM_MIN_ORDER; - --tmp_order) { - - retcode = drm_dma_get_buffers_of_order(dev, dma, - tmp_order); - } - } - - if (dma->granted_count < dma->request_count - && (dma->flags & _DRM_DMA_LARGER_OK)) { - for (tmp_order = order + 1; - !retcode - && dma->granted_count < dma->request_count - && tmp_order <= DRM_MAX_ORDER; - ++tmp_order) { - - retcode = drm_dma_get_buffers_of_order(dev, dma, - tmp_order); - } - } - return 0; -} -- cgit v1.2.3