patch-2.2.18 linux/drivers/char/drm/mga_dma.c
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- Lines: 1066
- Date:
Tue Nov 28 17:33:24 2000
- Orig file:
v2.2.17/drivers/char/drm/mga_dma.c
- Orig date:
Thu Jan 1 01:00:00 1970
diff -u --new-file --recursive --exclude-from /usr/src/exclude v2.2.17/drivers/char/drm/mga_dma.c linux/drivers/char/drm/mga_dma.c
@@ -0,0 +1,1065 @@
+/* mga_dma.c -- DMA support for mga g200/g400 -*- linux-c -*-
+ * Created: Mon Dec 13 01:50:01 1999 by jhartmann@precisioninsight.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
+ * 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 <faith@valinux.com>
+ * Jeff Hartmann <jhartmann@valinux.com>
+ * Keith Whitwell <keithw@valinux.com>
+ *
+ */
+
+#define __NO_VERSION__
+#include "drmP.h"
+#include "mga_drv.h"
+
+#include <linux/interrupt.h> /* For task queue support */
+
+#define MGA_REG(reg) 2
+#define MGA_BASE(reg) ((unsigned long) \
+ ((drm_device_t *)dev)->maplist[MGA_REG(reg)]->handle)
+#define MGA_ADDR(reg) (MGA_BASE(reg) + reg)
+#define MGA_DEREF(reg) *(__volatile__ int *)MGA_ADDR(reg)
+#define MGA_READ(reg) MGA_DEREF(reg)
+#define MGA_WRITE(reg,val) do { MGA_DEREF(reg) = val; } while (0)
+
+#define PDEA_pagpxfer_enable 0x2
+
+static int mga_flush_queue(drm_device_t *dev);
+
+static unsigned long mga_alloc_page(drm_device_t *dev)
+{
+ unsigned long address;
+
+ address = __get_free_page(GFP_KERNEL);
+ if(address == 0UL) {
+ return 0;
+ }
+ atomic_inc(&virt_to_page(address)->count);
+ set_bit(PG_reserved, &virt_to_page(address)->flags);
+
+ return address;
+}
+
+static void mga_free_page(drm_device_t *dev, unsigned long page)
+{
+ if(!page) return;
+ atomic_dec(&virt_to_page(page)->count);
+ clear_bit(PG_reserved, &virt_to_page(page)->flags);
+ free_page(page);
+ return;
+}
+
+static void mga_delay(void)
+{
+ return;
+}
+
+/* These are two age tags that will never be sent to
+ * the hardware */
+#define MGA_BUF_USED 0xffffffff
+#define MGA_BUF_FREE 0
+
+static int mga_freelist_init(drm_device_t *dev)
+{
+ drm_device_dma_t *dma = dev->dma;
+ drm_buf_t *buf;
+ drm_mga_buf_priv_t *buf_priv;
+ drm_mga_private_t *dev_priv = (drm_mga_private_t *)dev->dev_private;
+ drm_mga_freelist_t *item;
+ int i;
+
+ DRM_DEBUG("%s\n", __FUNCTION__);
+
+ dev_priv->head = drm_alloc(sizeof(drm_mga_freelist_t), DRM_MEM_DRIVER);
+ if(dev_priv->head == NULL) return -ENOMEM;
+ memset(dev_priv->head, 0, sizeof(drm_mga_freelist_t));
+ dev_priv->head->age = MGA_BUF_USED;
+
+ for (i = 0; i < dma->buf_count; i++) {
+ buf = dma->buflist[ i ];
+ buf_priv = buf->dev_private;
+ item = drm_alloc(sizeof(drm_mga_freelist_t),
+ DRM_MEM_DRIVER);
+ if(item == NULL) return -ENOMEM;
+ memset(item, 0, sizeof(drm_mga_freelist_t));
+ item->age = MGA_BUF_FREE;
+ item->prev = dev_priv->head;
+ item->next = dev_priv->head->next;
+ if(dev_priv->head->next != NULL)
+ dev_priv->head->next->prev = item;
+ if(item->next == NULL) dev_priv->tail = item;
+ item->buf = buf;
+ buf_priv->my_freelist = item;
+ buf_priv->discard = 0;
+ buf_priv->dispatched = 0;
+ dev_priv->head->next = item;
+ }
+
+ return 0;
+}
+
+static void mga_freelist_cleanup(drm_device_t *dev)
+{
+ drm_mga_private_t *dev_priv = (drm_mga_private_t *)dev->dev_private;
+ drm_mga_freelist_t *item;
+ drm_mga_freelist_t *prev;
+
+ DRM_DEBUG("%s\n", __FUNCTION__);
+
+ item = dev_priv->head;
+ while(item) {
+ prev = item;
+ item = item->next;
+ drm_free(prev, sizeof(drm_mga_freelist_t), DRM_MEM_DRIVER);
+ }
+
+ dev_priv->head = dev_priv->tail = NULL;
+}
+
+/* Frees dispatch lock */
+static inline void mga_dma_quiescent(drm_device_t *dev)
+{
+ drm_device_dma_t *dma = dev->dma;
+ drm_mga_private_t *dev_priv = (drm_mga_private_t *)dev->dev_private;
+ drm_mga_sarea_t *sarea_priv = dev_priv->sarea_priv;
+ unsigned long end;
+ int i;
+
+ DRM_DEBUG("dispatch_status = 0x%02x\n", dev_priv->dispatch_status);
+ end = jiffies + (HZ*3);
+ while(1) {
+ if(!test_and_set_bit(MGA_IN_DISPATCH,
+ &dev_priv->dispatch_status)) {
+ break;
+ }
+ if((signed)(end - jiffies) <= 0) {
+ DRM_ERROR("irqs: %d wanted %d\n",
+ atomic_read(&dev->total_irq),
+ atomic_read(&dma->total_lost));
+ DRM_ERROR("lockup: dispatch_status = 0x%02x,"
+ " jiffies = %lu, end = %lu\n",
+ dev_priv->dispatch_status, jiffies, end);
+ goto out_nolock;
+ }
+ for (i = 0 ; i < 2000 ; i++) mga_delay();
+ }
+ end = jiffies + (HZ*3);
+ DRM_DEBUG("quiescent status : %x\n", MGA_READ(MGAREG_STATUS));
+ while((MGA_READ(MGAREG_STATUS) & 0x00030001) != 0x00020000) {
+ if((signed)(end - jiffies) <= 0) {
+ DRM_ERROR("irqs: %d wanted %d\n",
+ atomic_read(&dev->total_irq),
+ atomic_read(&dma->total_lost));
+ DRM_ERROR("lockup\n");
+ goto out_status;
+ }
+ for (i = 0 ; i < 2000 ; i++) mga_delay();
+ }
+ sarea_priv->dirty |= MGA_DMA_FLUSH;
+
+out_status:
+ clear_bit(MGA_IN_DISPATCH, &dev_priv->dispatch_status);
+out_nolock:
+}
+
+static void mga_reset_freelist(drm_device_t *dev)
+{
+ drm_device_dma_t *dma = dev->dma;
+ drm_buf_t *buf;
+ drm_mga_buf_priv_t *buf_priv;
+ int i;
+
+ for (i = 0; i < dma->buf_count; i++) {
+ buf = dma->buflist[ i ];
+ buf_priv = buf->dev_private;
+ buf_priv->my_freelist->age = MGA_BUF_FREE;
+ }
+}
+
+/* Least recently used :
+ * These operations are not atomic b/c they are protected by the
+ * hardware lock */
+
+drm_buf_t *mga_freelist_get(drm_device_t *dev)
+{
+ DECLARE_WAITQUEUE(entry, current);
+ drm_mga_private_t *dev_priv =
+ (drm_mga_private_t *) dev->dev_private;
+ drm_mga_freelist_t *prev;
+ drm_mga_freelist_t *next;
+ static int failed = 0;
+ int return_null = 0;
+
+ if(failed >= 1000 && dev_priv->tail->age >= dev_priv->last_prim_age) {
+ DRM_DEBUG("Waiting on freelist,"
+ " tail->age = %d, last_prim_age= %d\n",
+ dev_priv->tail->age,
+ dev_priv->last_prim_age);
+ add_wait_queue(&dev_priv->buf_queue, &entry);
+ set_bit(MGA_IN_GETBUF, &dev_priv->dispatch_status);
+ for (;;) {
+ current->state = TASK_INTERRUPTIBLE;
+ mga_dma_schedule(dev, 0);
+ if(dev_priv->tail->age < dev_priv->last_prim_age)
+ break;
+ atomic_inc(&dev->total_sleeps);
+ schedule();
+ if (signal_pending(current)) {
+ ++return_null;
+ break;
+ }
+ }
+ clear_bit(MGA_IN_GETBUF, &dev_priv->dispatch_status);
+ current->state = TASK_RUNNING;
+ remove_wait_queue(&dev_priv->buf_queue, &entry);
+ if (return_null) return NULL;
+ }
+
+ if(dev_priv->tail->age < dev_priv->last_prim_age) {
+ prev = dev_priv->tail->prev;
+ next = dev_priv->tail;
+ prev->next = NULL;
+ next->prev = next->next = NULL;
+ dev_priv->tail = prev;
+ next->age = MGA_BUF_USED;
+ failed = 0;
+ return next->buf;
+ }
+
+ failed++;
+ return NULL;
+}
+
+int mga_freelist_put(drm_device_t *dev, drm_buf_t *buf)
+{
+ drm_mga_private_t *dev_priv =
+ (drm_mga_private_t *) dev->dev_private;
+ drm_mga_buf_priv_t *buf_priv = buf->dev_private;
+ drm_mga_freelist_t *prev;
+ drm_mga_freelist_t *head;
+ drm_mga_freelist_t *next;
+
+ DRM_DEBUG("%s\n", __FUNCTION__);
+
+ if(buf_priv->my_freelist->age == MGA_BUF_USED) {
+ /* Discarded buffer, put it on the tail */
+ next = buf_priv->my_freelist;
+ next->age = MGA_BUF_FREE;
+ prev = dev_priv->tail;
+ prev->next = next;
+ next->prev = prev;
+ next->next = NULL;
+ dev_priv->tail = next;
+ DRM_DEBUG("Discarded\n");
+ } else {
+ /* Normally aged buffer, put it on the head + 1,
+ * as the real head is a sentinal element
+ */
+ next = buf_priv->my_freelist;
+ head = dev_priv->head;
+ prev = head->next;
+ head->next = next;
+ prev->prev = next;
+ next->prev = head;
+ next->next = prev;
+ }
+
+ return 0;
+}
+
+static int mga_init_primary_bufs(drm_device_t *dev, drm_mga_init_t *init)
+{
+ drm_mga_private_t *dev_priv = dev->dev_private;
+ drm_mga_prim_buf_t *prim_buffer;
+ int i, temp, size_of_buf;
+ int offset = init->reserved_map_agpstart;
+
+ dev_priv->primary_size = ((init->primary_size + PAGE_SIZE - 1) /
+ PAGE_SIZE) * PAGE_SIZE;
+ size_of_buf = dev_priv->primary_size / MGA_NUM_PRIM_BUFS;
+ dev_priv->warp_ucode_size = init->warp_ucode_size;
+ dev_priv->prim_bufs = drm_alloc(sizeof(drm_mga_prim_buf_t *) *
+ (MGA_NUM_PRIM_BUFS + 1),
+ DRM_MEM_DRIVER);
+ if(dev_priv->prim_bufs == NULL) {
+ DRM_ERROR("Unable to allocate memory for prim_buf\n");
+ return -ENOMEM;
+ }
+ memset(dev_priv->prim_bufs,
+ 0, sizeof(drm_mga_prim_buf_t *) * (MGA_NUM_PRIM_BUFS + 1));
+
+ temp = init->warp_ucode_size + dev_priv->primary_size;
+ temp = ((temp + PAGE_SIZE - 1) / PAGE_SIZE) * PAGE_SIZE;
+
+ dev_priv->ioremap = drm_ioremap(dev->agp->base + offset,
+ temp);
+ if(dev_priv->ioremap == NULL) {
+ DRM_ERROR("Ioremap failed\n");
+ return -ENOMEM;
+ }
+ init_waitqueue_head(&dev_priv->wait_queue);
+
+ for(i = 0; i < MGA_NUM_PRIM_BUFS; i++) {
+ prim_buffer = drm_alloc(sizeof(drm_mga_prim_buf_t),
+ DRM_MEM_DRIVER);
+ if(prim_buffer == NULL) return -ENOMEM;
+ memset(prim_buffer, 0, sizeof(drm_mga_prim_buf_t));
+ prim_buffer->phys_head = offset + dev->agp->base;
+ prim_buffer->current_dma_ptr =
+ prim_buffer->head =
+ (u32 *) (dev_priv->ioremap +
+ offset -
+ init->reserved_map_agpstart);
+ prim_buffer->num_dwords = 0;
+ prim_buffer->max_dwords = size_of_buf / sizeof(u32);
+ prim_buffer->max_dwords -= 5; /* Leave room for the softrap */
+ prim_buffer->sec_used = 0;
+ prim_buffer->idx = i;
+ prim_buffer->prim_age = i + 1;
+ offset = offset + size_of_buf;
+ dev_priv->prim_bufs[i] = prim_buffer;
+ }
+ dev_priv->current_prim_idx = 0;
+ dev_priv->next_prim =
+ dev_priv->last_prim =
+ dev_priv->current_prim =
+ dev_priv->prim_bufs[0];
+ dev_priv->next_prim_age = 2;
+ dev_priv->last_prim_age = 1;
+ set_bit(MGA_BUF_IN_USE, &dev_priv->current_prim->buffer_status);
+ return 0;
+}
+
+void mga_fire_primary(drm_device_t *dev, drm_mga_prim_buf_t *prim)
+{
+ drm_mga_private_t *dev_priv = dev->dev_private;
+ drm_device_dma_t *dma = dev->dma;
+ drm_mga_sarea_t *sarea_priv = dev_priv->sarea_priv;
+ int use_agp = PDEA_pagpxfer_enable;
+ unsigned long end;
+ int i;
+ int next_idx;
+ PRIMLOCALS;
+
+ DRM_DEBUG("%s\n", __FUNCTION__);
+ dev_priv->last_prim = prim;
+
+ /* We never check for overflow, b/c there is always room */
+ PRIMPTR(prim);
+ if(num_dwords <= 0) {
+ DRM_DEBUG("num_dwords == 0 when dispatched\n");
+ goto out_prim_wait;
+ }
+ PRIMOUTREG( MGAREG_DMAPAD, 0);
+ PRIMOUTREG( MGAREG_DMAPAD, 0);
+ PRIMOUTREG( MGAREG_DMAPAD, 0);
+ PRIMOUTREG( MGAREG_SOFTRAP, 0);
+ PRIMFINISH(prim);
+
+ end = jiffies + (HZ*3);
+ if(sarea_priv->dirty & MGA_DMA_FLUSH) {
+ DRM_DEBUG("Dma top flush\n");
+ while((MGA_READ(MGAREG_STATUS) & 0x00030001) != 0x00020000) {
+ if((signed)(end - jiffies) <= 0) {
+ DRM_ERROR("irqs: %d wanted %d\n",
+ atomic_read(&dev->total_irq),
+ atomic_read(&dma->total_lost));
+ DRM_ERROR("lockup in fire primary "
+ "(Dma Top Flush)\n");
+ goto out_prim_wait;
+ }
+
+ for (i = 0 ; i < 4096 ; i++) mga_delay();
+ }
+ sarea_priv->dirty &= ~(MGA_DMA_FLUSH);
+ } else {
+ DRM_DEBUG("Status wait\n");
+ while((MGA_READ(MGAREG_STATUS) & 0x00020001) != 0x00020000) {
+ if((signed)(end - jiffies) <= 0) {
+ DRM_ERROR("irqs: %d wanted %d\n",
+ atomic_read(&dev->total_irq),
+ atomic_read(&dma->total_lost));
+ DRM_ERROR("lockup in fire primary "
+ "(Status Wait)\n");
+ goto out_prim_wait;
+ }
+
+ for (i = 0 ; i < 4096 ; i++) mga_delay();
+ }
+ }
+
+ mga_flush_write_combine();
+ atomic_inc(&dev_priv->pending_bufs);
+ MGA_WRITE(MGAREG_PRIMADDRESS, phys_head | TT_GENERAL);
+ MGA_WRITE(MGAREG_PRIMEND, (phys_head + num_dwords * 4) | use_agp);
+ prim->num_dwords = 0;
+ sarea_priv->last_enqueue = prim->prim_age;
+
+ next_idx = prim->idx + 1;
+ if(next_idx >= MGA_NUM_PRIM_BUFS)
+ next_idx = 0;
+
+ dev_priv->next_prim = dev_priv->prim_bufs[next_idx];
+ return;
+
+ out_prim_wait:
+ prim->num_dwords = 0;
+ prim->sec_used = 0;
+ clear_bit(MGA_BUF_IN_USE, &prim->buffer_status);
+ wake_up_interruptible(&dev_priv->wait_queue);
+ clear_bit(MGA_BUF_SWAP_PENDING, &prim->buffer_status);
+ clear_bit(MGA_IN_DISPATCH, &dev_priv->dispatch_status);
+}
+
+int mga_advance_primary(drm_device_t *dev)
+{
+ DECLARE_WAITQUEUE(entry, current);
+ drm_mga_private_t *dev_priv = dev->dev_private;
+ drm_mga_prim_buf_t *prim_buffer;
+ drm_device_dma_t *dma = dev->dma;
+ int next_prim_idx;
+ int ret = 0;
+
+ /* This needs to reset the primary buffer if available,
+ * we should collect stats on how many times it bites
+ * it's tail */
+ DRM_DEBUG("%s\n", __FUNCTION__);
+
+ next_prim_idx = dev_priv->current_prim_idx + 1;
+ if(next_prim_idx >= MGA_NUM_PRIM_BUFS)
+ next_prim_idx = 0;
+ prim_buffer = dev_priv->prim_bufs[next_prim_idx];
+ set_bit(MGA_IN_WAIT, &dev_priv->dispatch_status);
+
+ /* In use is cleared in interrupt handler */
+
+ if(test_and_set_bit(MGA_BUF_IN_USE, &prim_buffer->buffer_status)) {
+ add_wait_queue(&dev_priv->wait_queue, &entry);
+ for (;;) {
+ current->state = TASK_INTERRUPTIBLE;
+ mga_dma_schedule(dev, 0);
+ if(!test_and_set_bit(MGA_BUF_IN_USE,
+ &prim_buffer->buffer_status))
+ break;
+ atomic_inc(&dev->total_sleeps);
+ atomic_inc(&dma->total_missed_sched);
+ schedule();
+ if (signal_pending(current)) {
+ ret = -ERESTARTSYS;
+ break;
+ }
+ }
+ current->state = TASK_RUNNING;
+ remove_wait_queue(&dev_priv->wait_queue, &entry);
+ if(ret) return ret;
+ }
+ clear_bit(MGA_IN_WAIT, &dev_priv->dispatch_status);
+
+ /* This primary buffer is now free to use */
+ prim_buffer->current_dma_ptr = prim_buffer->head;
+ prim_buffer->num_dwords = 0;
+ prim_buffer->sec_used = 0;
+ prim_buffer->prim_age = dev_priv->next_prim_age++;
+ if(prim_buffer->prim_age == 0 || prim_buffer->prim_age == 0xffffffff) {
+ mga_flush_queue(dev);
+ mga_dma_quiescent(dev);
+ mga_reset_freelist(dev);
+ prim_buffer->prim_age = (dev_priv->next_prim_age += 2);
+ }
+
+ /* Reset all buffer status stuff */
+ clear_bit(MGA_BUF_NEEDS_OVERFLOW, &prim_buffer->buffer_status);
+ clear_bit(MGA_BUF_FORCE_FIRE, &prim_buffer->buffer_status);
+ clear_bit(MGA_BUF_SWAP_PENDING, &prim_buffer->buffer_status);
+
+ dev_priv->current_prim = prim_buffer;
+ dev_priv->current_prim_idx = next_prim_idx;
+ return 0;
+}
+
+/* More dynamic performance decisions */
+static inline int mga_decide_to_fire(drm_device_t *dev)
+{
+ drm_mga_private_t *dev_priv = (drm_mga_private_t *)dev->dev_private;
+
+ if(test_bit(MGA_BUF_FORCE_FIRE, &dev_priv->next_prim->buffer_status)) {
+ return 1;
+ }
+
+ if (test_bit(MGA_IN_GETBUF, &dev_priv->dispatch_status) &&
+ dev_priv->next_prim->num_dwords) {
+ return 1;
+ }
+
+ if (test_bit(MGA_IN_FLUSH, &dev_priv->dispatch_status) &&
+ dev_priv->next_prim->num_dwords) {
+ return 1;
+ }
+
+ if(atomic_read(&dev_priv->pending_bufs) <= MGA_NUM_PRIM_BUFS - 1) {
+ if(test_bit(MGA_BUF_SWAP_PENDING,
+ &dev_priv->next_prim->buffer_status)) {
+ return 1;
+ }
+ }
+
+ if(atomic_read(&dev_priv->pending_bufs) <= MGA_NUM_PRIM_BUFS / 2) {
+ if(dev_priv->next_prim->sec_used >= MGA_DMA_BUF_NR / 8) {
+ return 1;
+ }
+ }
+
+ if(atomic_read(&dev_priv->pending_bufs) >= MGA_NUM_PRIM_BUFS / 2) {
+ if(dev_priv->next_prim->sec_used >= MGA_DMA_BUF_NR / 4) {
+ return 1;
+ }
+ }
+
+ return 0;
+}
+
+int mga_dma_schedule(drm_device_t *dev, int locked)
+{
+ drm_mga_private_t *dev_priv = (drm_mga_private_t *)dev->dev_private;
+ int retval = 0;
+
+ if (!dev_priv) return -EBUSY;
+
+ if (test_and_set_bit(0, &dev->dma_flag)) {
+ retval = -EBUSY;
+ goto sch_out_wakeup;
+ }
+
+ DRM_DEBUG("%s\n", __FUNCTION__);
+
+ if(test_bit(MGA_IN_FLUSH, &dev_priv->dispatch_status) ||
+ test_bit(MGA_IN_WAIT, &dev_priv->dispatch_status) ||
+ test_bit(MGA_IN_GETBUF, &dev_priv->dispatch_status)) {
+ locked = 1;
+ }
+
+ if (!locked &&
+ !drm_lock_take(&dev->lock.hw_lock->lock, DRM_KERNEL_CONTEXT)) {
+ clear_bit(0, &dev->dma_flag);
+ retval = -EBUSY;
+ goto sch_out_wakeup;
+ }
+
+ if(!test_and_set_bit(MGA_IN_DISPATCH, &dev_priv->dispatch_status)) {
+ /* Fire dma buffer */
+ if(mga_decide_to_fire(dev)) {
+ clear_bit(MGA_BUF_FORCE_FIRE,
+ &dev_priv->next_prim->buffer_status);
+ if(dev_priv->current_prim == dev_priv->next_prim) {
+ /* Schedule overflow for a later time */
+ set_bit(MGA_BUF_NEEDS_OVERFLOW,
+ &dev_priv->next_prim->buffer_status);
+ }
+ mga_fire_primary(dev, dev_priv->next_prim);
+ } else {
+ clear_bit(MGA_IN_DISPATCH, &dev_priv->dispatch_status);
+ }
+ }
+
+ if (!locked) {
+ if (drm_lock_free(dev, &dev->lock.hw_lock->lock,
+ DRM_KERNEL_CONTEXT)) {
+ DRM_ERROR("\n");
+ }
+ }
+
+ clear_bit(0, &dev->dma_flag);
+
+sch_out_wakeup:
+ if(test_bit(MGA_IN_FLUSH, &dev_priv->dispatch_status) &&
+ atomic_read(&dev_priv->pending_bufs) == 0) {
+ /* Everything has been processed by the hardware */
+ clear_bit(MGA_IN_FLUSH, &dev_priv->dispatch_status);
+ wake_up_interruptible(&dev_priv->flush_queue);
+ }
+
+ if(test_bit(MGA_IN_GETBUF, &dev_priv->dispatch_status) &&
+ dev_priv->tail->age < dev_priv->last_prim_age)
+ wake_up_interruptible(&dev_priv->buf_queue);
+
+ return retval;
+}
+
+static void mga_dma_service(int irq, void *device, struct pt_regs *regs)
+{
+ drm_device_t *dev = (drm_device_t *)device;
+ drm_mga_private_t *dev_priv = (drm_mga_private_t *)dev->dev_private;
+ drm_mga_prim_buf_t *last_prim_buffer;
+
+ atomic_inc(&dev->total_irq);
+ if((MGA_READ(MGAREG_STATUS) & 0x00000001) != 0x00000001) return;
+ MGA_WRITE(MGAREG_ICLEAR, 0x00000001);
+ last_prim_buffer = dev_priv->last_prim;
+ last_prim_buffer->num_dwords = 0;
+ last_prim_buffer->sec_used = 0;
+ dev_priv->sarea_priv->last_dispatch =
+ dev_priv->last_prim_age = last_prim_buffer->prim_age;
+ clear_bit(MGA_BUF_IN_USE, &last_prim_buffer->buffer_status);
+ clear_bit(MGA_BUF_SWAP_PENDING, &last_prim_buffer->buffer_status);
+ clear_bit(MGA_IN_DISPATCH, &dev_priv->dispatch_status);
+ atomic_dec(&dev_priv->pending_bufs);
+ queue_task(&dev->tq, &tq_immediate);
+ mark_bh(IMMEDIATE_BH);
+ wake_up_interruptible(&dev_priv->wait_queue);
+}
+
+static void mga_dma_task_queue(void *device)
+{
+ mga_dma_schedule((drm_device_t *)device, 0);
+}
+
+int mga_dma_cleanup(drm_device_t *dev)
+{
+ if(dev->dev_private) {
+ drm_mga_private_t *dev_priv =
+ (drm_mga_private_t *) dev->dev_private;
+
+ if (dev->irq) mga_flush_queue(dev);
+ mga_dma_quiescent(dev);
+
+ if(dev_priv->ioremap) {
+ int temp = (dev_priv->warp_ucode_size +
+ dev_priv->primary_size +
+ PAGE_SIZE - 1) / PAGE_SIZE * PAGE_SIZE;
+
+ drm_ioremapfree((void *) dev_priv->ioremap, temp);
+ }
+ if(dev_priv->status_page != NULL) {
+ iounmap(dev_priv->status_page);
+ }
+ if(dev_priv->real_status_page != 0UL) {
+ mga_free_page(dev, dev_priv->real_status_page);
+ }
+ if(dev_priv->prim_bufs != NULL) {
+ int i;
+ for(i = 0; i < MGA_NUM_PRIM_BUFS; i++) {
+ if(dev_priv->prim_bufs[i] != NULL) {
+ drm_free(dev_priv->prim_bufs[i],
+ sizeof(drm_mga_prim_buf_t),
+ DRM_MEM_DRIVER);
+ }
+ }
+ drm_free(dev_priv->prim_bufs, sizeof(void *) *
+ (MGA_NUM_PRIM_BUFS + 1),
+ DRM_MEM_DRIVER);
+ }
+ if(dev_priv->head != NULL) {
+ mga_freelist_cleanup(dev);
+ }
+
+
+ drm_free(dev->dev_private, sizeof(drm_mga_private_t),
+ DRM_MEM_DRIVER);
+ dev->dev_private = NULL;
+ }
+
+ return 0;
+}
+
+static int mga_dma_initialize(drm_device_t *dev, drm_mga_init_t *init) {
+ drm_mga_private_t *dev_priv;
+ drm_map_t *sarea_map = NULL;
+
+ dev_priv = drm_alloc(sizeof(drm_mga_private_t), DRM_MEM_DRIVER);
+ if(dev_priv == NULL) return -ENOMEM;
+ dev->dev_private = (void *) dev_priv;
+
+ memset(dev_priv, 0, sizeof(drm_mga_private_t));
+
+ if((init->reserved_map_idx >= dev->map_count) ||
+ (init->buffer_map_idx >= dev->map_count)) {
+ mga_dma_cleanup(dev);
+ DRM_DEBUG("reserved_map or buffer_map are invalid\n");
+ return -EINVAL;
+ }
+
+ dev_priv->reserved_map_idx = init->reserved_map_idx;
+ dev_priv->buffer_map_idx = init->buffer_map_idx;
+ sarea_map = dev->maplist[0];
+ dev_priv->sarea_priv = (drm_mga_sarea_t *)
+ ((u8 *)sarea_map->handle +
+ init->sarea_priv_offset);
+
+ /* Scale primary size to the next page */
+ dev_priv->chipset = init->chipset;
+ dev_priv->frontOffset = init->frontOffset;
+ dev_priv->backOffset = init->backOffset;
+ dev_priv->depthOffset = init->depthOffset;
+ dev_priv->textureOffset = init->textureOffset;
+ dev_priv->textureSize = init->textureSize;
+ dev_priv->cpp = init->cpp;
+ dev_priv->sgram = init->sgram;
+ dev_priv->stride = init->stride;
+
+ dev_priv->mAccess = init->mAccess;
+ init_waitqueue_head(&dev_priv->flush_queue);
+ init_waitqueue_head(&dev_priv->buf_queue);
+ dev_priv->WarpPipe = 0xff000000;
+ dev_priv->vertexsize = 0;
+
+ DRM_DEBUG("chipset=%d ucode_size=%d backOffset=%x depthOffset=%x\n",
+ dev_priv->chipset, dev_priv->warp_ucode_size,
+ dev_priv->backOffset, dev_priv->depthOffset);
+ DRM_DEBUG("cpp: %d sgram: %d stride: %d maccess: %x\n",
+ dev_priv->cpp, dev_priv->sgram, dev_priv->stride,
+ dev_priv->mAccess);
+
+ memcpy(&dev_priv->WarpIndex, &init->WarpIndex,
+ sizeof(drm_mga_warp_index_t) * MGA_MAX_WARP_PIPES);
+
+ if(mga_init_primary_bufs(dev, init) != 0) {
+ DRM_ERROR("Can not initialize primary buffers\n");
+ mga_dma_cleanup(dev);
+ return -ENOMEM;
+ }
+ dev_priv->real_status_page = mga_alloc_page(dev);
+ if(dev_priv->real_status_page == 0UL) {
+ mga_dma_cleanup(dev);
+ DRM_ERROR("Can not allocate status page\n");
+ return -ENOMEM;
+ }
+
+ dev_priv->status_page =
+ ioremap_nocache(virt_to_bus((void *)dev_priv->real_status_page),
+ PAGE_SIZE);
+
+ if(dev_priv->status_page == NULL) {
+ mga_dma_cleanup(dev);
+ DRM_ERROR("Can not remap status page\n");
+ return -ENOMEM;
+ }
+
+ /* Write status page when secend or softrap occurs */
+ MGA_WRITE(MGAREG_PRIMPTR,
+ virt_to_bus((void *)dev_priv->real_status_page) | 0x00000003);
+
+
+ /* Private is now filled in, initialize the hardware */
+ {
+ PRIMLOCALS;
+ PRIMGETPTR( dev_priv );
+
+ PRIMOUTREG(MGAREG_DMAPAD, 0);
+ PRIMOUTREG(MGAREG_DMAPAD, 0);
+ PRIMOUTREG(MGAREG_DWGSYNC, 0x0100);
+ PRIMOUTREG(MGAREG_SOFTRAP, 0);
+ /* Poll for the first buffer to insure that
+ * the status register will be correct
+ */
+
+ mga_flush_write_combine();
+ MGA_WRITE(MGAREG_PRIMADDRESS, phys_head | TT_GENERAL);
+
+ MGA_WRITE(MGAREG_PRIMEND, ((phys_head + num_dwords * 4) |
+ PDEA_pagpxfer_enable));
+
+ while(MGA_READ(MGAREG_DWGSYNC) != 0x0100) ;
+ }
+
+ if(mga_freelist_init(dev) != 0) {
+ DRM_ERROR("Could not initialize freelist\n");
+ mga_dma_cleanup(dev);
+ return -ENOMEM;
+ }
+ return 0;
+}
+
+int mga_dma_init(struct inode *inode, struct file *filp,
+ unsigned int cmd, unsigned long arg)
+{
+ drm_file_t *priv = filp->private_data;
+ drm_device_t *dev = priv->dev;
+ drm_mga_init_t init;
+
+ DRM_DEBUG("%s\n", __FUNCTION__);
+
+ copy_from_user_ret(&init, (drm_mga_init_t *)arg, sizeof(init), -EFAULT);
+
+ switch(init.func) {
+ case MGA_INIT_DMA:
+ return mga_dma_initialize(dev, &init);
+ case MGA_CLEANUP_DMA:
+ return mga_dma_cleanup(dev);
+ }
+
+ return -EINVAL;
+}
+
+int mga_irq_install(drm_device_t *dev, int irq)
+{
+ int retcode;
+
+ if (!irq) return -EINVAL;
+
+ down(&dev->struct_sem);
+ if (dev->irq) {
+ up(&dev->struct_sem);
+ return -EBUSY;
+ }
+ dev->irq = irq;
+ up(&dev->struct_sem);
+
+ DRM_DEBUG("install irq handler %d\n", irq);
+
+ dev->context_flag = 0;
+ dev->interrupt_flag = 0;
+ dev->dma_flag = 0;
+ dev->dma->next_buffer = NULL;
+ dev->dma->next_queue = NULL;
+ dev->dma->this_buffer = NULL;
+ dev->tq.next = NULL;
+ dev->tq.sync = 0;
+ dev->tq.routine = mga_dma_task_queue;
+ dev->tq.data = dev;
+
+ /* Before installing handler */
+ MGA_WRITE(MGAREG_IEN, 0);
+ /* Install handler */
+ if ((retcode = request_irq(dev->irq,
+ mga_dma_service,
+ SA_SHIRQ,
+ dev->devname,
+ dev))) {
+ down(&dev->struct_sem);
+ dev->irq = 0;
+ up(&dev->struct_sem);
+ return retcode;
+ }
+ /* After installing handler */
+ MGA_WRITE(MGAREG_ICLEAR, 0x00000001);
+ MGA_WRITE(MGAREG_IEN, 0x00000001);
+ return 0;
+}
+
+int mga_irq_uninstall(drm_device_t *dev)
+{
+ int irq;
+
+ down(&dev->struct_sem);
+ irq = dev->irq;
+ dev->irq = 0;
+ up(&dev->struct_sem);
+
+ if (!irq) return -EINVAL;
+ DRM_DEBUG("remove irq handler %d\n", irq);
+ MGA_WRITE(MGAREG_ICLEAR, 0x00000001);
+ MGA_WRITE(MGAREG_IEN, 0);
+ free_irq(irq, dev);
+ return 0;
+}
+
+int mga_control(struct inode *inode, struct file *filp, unsigned int cmd,
+ unsigned long arg)
+{
+ drm_file_t *priv = filp->private_data;
+ drm_device_t *dev = priv->dev;
+ drm_control_t ctl;
+
+ copy_from_user_ret(&ctl, (drm_control_t *)arg, sizeof(ctl), -EFAULT);
+
+ DRM_DEBUG("%s\n", __FUNCTION__);
+
+ switch (ctl.func) {
+ case DRM_INST_HANDLER:
+ return mga_irq_install(dev, ctl.irq);
+ case DRM_UNINST_HANDLER:
+ return mga_irq_uninstall(dev);
+ default:
+ return -EINVAL;
+ }
+}
+
+static int mga_flush_queue(drm_device_t *dev)
+{
+ DECLARE_WAITQUEUE(entry, current);
+ drm_mga_private_t *dev_priv = (drm_mga_private_t *)dev->dev_private;
+ int ret = 0;
+
+ if(!dev_priv) return 0;
+
+ if(dev_priv->next_prim->num_dwords != 0) {
+ add_wait_queue(&dev_priv->flush_queue, &entry);
+ if (test_bit(MGA_IN_FLUSH, &dev_priv->dispatch_status))
+ DRM_ERROR("Incorrect mga_flush_queue logic\n");
+ set_bit(MGA_IN_FLUSH, &dev_priv->dispatch_status);
+ mga_dma_schedule(dev, 0);
+ for (;;) {
+ current->state = TASK_INTERRUPTIBLE;
+ if (!test_bit(MGA_IN_FLUSH,
+ &dev_priv->dispatch_status))
+ break;
+ atomic_inc(&dev->total_sleeps);
+ schedule();
+ if (signal_pending(current)) {
+ ret = -EINTR; /* Can't restart */
+ clear_bit(MGA_IN_FLUSH,
+ &dev_priv->dispatch_status);
+ break;
+ }
+ }
+ current->state = TASK_RUNNING;
+ remove_wait_queue(&dev_priv->flush_queue, &entry);
+ }
+ return ret;
+}
+
+/* Must be called with the lock held */
+void mga_reclaim_buffers(drm_device_t *dev, pid_t pid)
+{
+ drm_device_dma_t *dma = dev->dma;
+ int i;
+
+ if (!dma) return;
+ if(dev->dev_private == NULL) return;
+ if(dma->buflist == NULL) return;
+
+ DRM_DEBUG("buf_count=%d\n", dma->buf_count);
+
+ mga_flush_queue(dev);
+
+ for (i = 0; i < dma->buf_count; i++) {
+ drm_buf_t *buf = dma->buflist[ i ];
+ drm_mga_buf_priv_t *buf_priv = buf->dev_private;
+
+ /* Only buffers that need to get reclaimed ever
+ * get set to free
+ */
+ if (buf->pid == pid && buf_priv) {
+ if(buf_priv->my_freelist->age == MGA_BUF_USED)
+ buf_priv->my_freelist->age = MGA_BUF_FREE;
+ }
+ }
+}
+
+int mga_lock(struct inode *inode, struct file *filp, unsigned int cmd,
+ unsigned long arg)
+{
+ drm_file_t *priv = filp->private_data;
+ drm_device_t *dev = priv->dev;
+ DECLARE_WAITQUEUE(entry, current);
+ int ret = 0;
+ drm_lock_t lock;
+
+ DRM_DEBUG("%s\n", __FUNCTION__);
+ copy_from_user_ret(&lock, (drm_lock_t *)arg, sizeof(lock), -EFAULT);
+
+ if (lock.context == DRM_KERNEL_CONTEXT) {
+ DRM_ERROR("Process %d using kernel context %d\n",
+ current->pid, lock.context);
+ return -EINVAL;
+ }
+
+ DRM_DEBUG("%d (pid %d) requests lock (0x%08x), flags = 0x%08x\n",
+ lock.context, current->pid, dev->lock.hw_lock->lock,
+ lock.flags);
+
+ if (lock.context < 0) {
+ return -EINVAL;
+ }
+
+ /* Only one queue:
+ */
+
+ if (!ret) {
+ add_wait_queue(&dev->lock.lock_queue, &entry);
+ for (;;) {
+ current->state = TASK_INTERRUPTIBLE;
+ if (!dev->lock.hw_lock) {
+ /* Device has been unregistered */
+ ret = -EINTR;
+ break;
+ }
+ if (drm_lock_take(&dev->lock.hw_lock->lock,
+ lock.context)) {
+ dev->lock.pid = current->pid;
+ dev->lock.lock_time = jiffies;
+ atomic_inc(&dev->total_locks);
+ break; /* Got lock */
+ }
+
+ /* Contention */
+ atomic_inc(&dev->total_sleeps);
+ schedule();
+ if (signal_pending(current)) {
+ ret = -ERESTARTSYS;
+ break;
+ }
+ }
+ current->state = TASK_RUNNING;
+ remove_wait_queue(&dev->lock.lock_queue, &entry);
+ }
+
+ if (!ret) {
+ if (lock.flags & _DRM_LOCK_QUIESCENT) {
+ DRM_DEBUG("_DRM_LOCK_QUIESCENT\n");
+ mga_flush_queue(dev);
+ mga_dma_quiescent(dev);
+ }
+ }
+
+ if (ret) DRM_DEBUG("%d %s\n", lock.context,
+ ret ? "interrupted" : "has lock");
+ return ret;
+}
+
+int mga_flush_ioctl(struct inode *inode, struct file *filp,
+ unsigned int cmd, unsigned long arg)
+{
+ drm_file_t *priv = filp->private_data;
+ drm_device_t *dev = priv->dev;
+ drm_lock_t lock;
+ drm_mga_private_t *dev_priv = (drm_mga_private_t *)dev->dev_private;
+
+ DRM_DEBUG("%s\n", __FUNCTION__);
+ copy_from_user_ret(&lock, (drm_lock_t *)arg, sizeof(lock), -EFAULT);
+
+ if(!_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)) {
+ DRM_ERROR("mga_flush_ioctl called without lock held\n");
+ return -EINVAL;
+ }
+
+ if(lock.flags & _DRM_LOCK_FLUSH || lock.flags & _DRM_LOCK_FLUSH_ALL) {
+ drm_mga_prim_buf_t *temp_buf;
+
+ temp_buf = dev_priv->current_prim;
+
+ if(temp_buf && temp_buf->num_dwords) {
+ set_bit(MGA_BUF_FORCE_FIRE, &temp_buf->buffer_status);
+ mga_advance_primary(dev);
+ }
+ mga_dma_schedule(dev, 1);
+ }
+ if(lock.flags & _DRM_LOCK_QUIESCENT) {
+ mga_flush_queue(dev);
+ mga_dma_quiescent(dev);
+ }
+
+ return 0;
+}
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)