patch-2.4.18 linux/drivers/char/drm-4.0/tdfx_drv.c
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- Lines: 698
- Date:
Wed Jan 9 21:56:59 2002
- Orig file:
linux.orig/drivers/char/drm-4.0/tdfx_drv.c
- Orig date:
Thu Jan 1 00:00:00 1970
diff -Naur -X /home/marcelo/lib/dontdiff linux.orig/drivers/char/drm-4.0/tdfx_drv.c linux/drivers/char/drm-4.0/tdfx_drv.c
@@ -0,0 +1,697 @@
+/* tdfx_drv.c -- tdfx driver -*- linux-c -*-
+ * Created: Thu Oct 7 10:38:32 1999 by faith@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>
+ * Daryll Strauss <daryll@valinux.com>
+ *
+ */
+
+#include <linux/config.h>
+#include "drmP.h"
+#include "tdfx_drv.h"
+
+#define TDFX_NAME "tdfx"
+#define TDFX_DESC "3dfx Banshee/Voodoo3+"
+#define TDFX_DATE "20000928"
+#define TDFX_MAJOR 1
+#define TDFX_MINOR 0
+#define TDFX_PATCHLEVEL 0
+
+static drm_device_t tdfx_device;
+drm_ctx_t tdfx_res_ctx;
+
+static struct file_operations tdfx_fops = {
+#if LINUX_VERSION_CODE >= 0x020400
+ /* This started being used during 2.4.0-test */
+ owner: THIS_MODULE,
+#endif
+ open: tdfx_open,
+ flush: drm_flush,
+ release: tdfx_release,
+ ioctl: tdfx_ioctl,
+ mmap: drm_mmap,
+ read: drm_read,
+ fasync: drm_fasync,
+ poll: drm_poll,
+};
+
+static struct miscdevice tdfx_misc = {
+ minor: MISC_DYNAMIC_MINOR,
+ name: TDFX_NAME,
+ fops: &tdfx_fops,
+};
+
+static drm_ioctl_desc_t tdfx_ioctls[] = {
+ [DRM_IOCTL_NR(DRM_IOCTL_VERSION)] = { tdfx_version, 0, 0 },
+ [DRM_IOCTL_NR(DRM_IOCTL_GET_UNIQUE)] = { drm_getunique, 0, 0 },
+ [DRM_IOCTL_NR(DRM_IOCTL_GET_MAGIC)] = { drm_getmagic, 0, 0 },
+ [DRM_IOCTL_NR(DRM_IOCTL_IRQ_BUSID)] = { drm_irq_busid, 0, 1 },
+
+ [DRM_IOCTL_NR(DRM_IOCTL_SET_UNIQUE)] = { drm_setunique, 1, 1 },
+ [DRM_IOCTL_NR(DRM_IOCTL_BLOCK)] = { drm_block, 1, 1 },
+ [DRM_IOCTL_NR(DRM_IOCTL_UNBLOCK)] = { drm_unblock, 1, 1 },
+ [DRM_IOCTL_NR(DRM_IOCTL_AUTH_MAGIC)] = { drm_authmagic, 1, 1 },
+ [DRM_IOCTL_NR(DRM_IOCTL_ADD_MAP)] = { drm_addmap, 1, 1 },
+
+ [DRM_IOCTL_NR(DRM_IOCTL_ADD_CTX)] = { tdfx_addctx, 1, 1 },
+ [DRM_IOCTL_NR(DRM_IOCTL_RM_CTX)] = { tdfx_rmctx, 1, 1 },
+ [DRM_IOCTL_NR(DRM_IOCTL_MOD_CTX)] = { tdfx_modctx, 1, 1 },
+ [DRM_IOCTL_NR(DRM_IOCTL_GET_CTX)] = { tdfx_getctx, 1, 0 },
+ [DRM_IOCTL_NR(DRM_IOCTL_SWITCH_CTX)] = { tdfx_switchctx, 1, 1 },
+ [DRM_IOCTL_NR(DRM_IOCTL_NEW_CTX)] = { tdfx_newctx, 1, 1 },
+ [DRM_IOCTL_NR(DRM_IOCTL_RES_CTX)] = { tdfx_resctx, 1, 0 },
+ [DRM_IOCTL_NR(DRM_IOCTL_ADD_DRAW)] = { drm_adddraw, 1, 1 },
+ [DRM_IOCTL_NR(DRM_IOCTL_RM_DRAW)] = { drm_rmdraw, 1, 1 },
+ [DRM_IOCTL_NR(DRM_IOCTL_LOCK)] = { tdfx_lock, 1, 0 },
+ [DRM_IOCTL_NR(DRM_IOCTL_UNLOCK)] = { tdfx_unlock, 1, 0 },
+ [DRM_IOCTL_NR(DRM_IOCTL_FINISH)] = { drm_finish, 1, 0 },
+#if defined(CONFIG_AGP) || defined(CONFIG_AGP_MODULE)
+ [DRM_IOCTL_NR(DRM_IOCTL_AGP_ACQUIRE)] = {drm_agp_acquire, 1, 1},
+ [DRM_IOCTL_NR(DRM_IOCTL_AGP_RELEASE)] = {drm_agp_release, 1, 1},
+ [DRM_IOCTL_NR(DRM_IOCTL_AGP_ENABLE)] = {drm_agp_enable, 1, 1},
+ [DRM_IOCTL_NR(DRM_IOCTL_AGP_INFO)] = {drm_agp_info, 1, 1},
+ [DRM_IOCTL_NR(DRM_IOCTL_AGP_ALLOC)] = {drm_agp_alloc, 1, 1},
+ [DRM_IOCTL_NR(DRM_IOCTL_AGP_FREE)] = {drm_agp_free, 1, 1},
+ [DRM_IOCTL_NR(DRM_IOCTL_AGP_BIND)] = {drm_agp_unbind, 1, 1},
+ [DRM_IOCTL_NR(DRM_IOCTL_AGP_UNBIND)] = {drm_agp_bind, 1, 1},
+#endif
+};
+#define TDFX_IOCTL_COUNT DRM_ARRAY_SIZE(tdfx_ioctls)
+
+#ifdef MODULE
+static char *tdfx = NULL;
+#endif
+
+MODULE_AUTHOR("VA Linux Systems, Inc.");
+MODULE_LICENSE("GPL and additional rights");
+MODULE_DESCRIPTION("tdfx");
+MODULE_PARM(tdfx, "s");
+
+#ifndef MODULE
+/* tdfx_options is called by the kernel to parse command-line options
+ * passed via the boot-loader (e.g., LILO). It calls the insmod option
+ * routine, drm_parse_drm.
+ */
+
+static int __init tdfx_options(char *str)
+{
+ drm_parse_options(str);
+ return 1;
+}
+
+__setup("tdfx=", tdfx_options);
+#endif
+
+static int tdfx_setup(drm_device_t *dev)
+{
+ int i;
+
+ atomic_set(&dev->ioctl_count, 0);
+ atomic_set(&dev->vma_count, 0);
+ dev->buf_use = 0;
+ atomic_set(&dev->buf_alloc, 0);
+
+ atomic_set(&dev->total_open, 0);
+ atomic_set(&dev->total_close, 0);
+ atomic_set(&dev->total_ioctl, 0);
+ atomic_set(&dev->total_irq, 0);
+ atomic_set(&dev->total_ctx, 0);
+ atomic_set(&dev->total_locks, 0);
+ atomic_set(&dev->total_unlocks, 0);
+ atomic_set(&dev->total_contends, 0);
+ atomic_set(&dev->total_sleeps, 0);
+
+ for (i = 0; i < DRM_HASH_SIZE; i++) {
+ dev->magiclist[i].head = NULL;
+ dev->magiclist[i].tail = NULL;
+ }
+ dev->maplist = NULL;
+ dev->map_count = 0;
+ dev->vmalist = NULL;
+ dev->lock.hw_lock = NULL;
+ init_waitqueue_head(&dev->lock.lock_queue);
+ dev->queue_count = 0;
+ dev->queue_reserved = 0;
+ dev->queue_slots = 0;
+ dev->queuelist = NULL;
+ dev->irq = 0;
+ dev->context_flag = 0;
+ dev->interrupt_flag = 0;
+ dev->dma = 0;
+ dev->dma_flag = 0;
+ dev->last_context = 0;
+ dev->last_switch = 0;
+ dev->last_checked = 0;
+ init_timer(&dev->timer);
+ init_waitqueue_head(&dev->context_wait);
+
+ dev->ctx_start = 0;
+ dev->lck_start = 0;
+
+ dev->buf_rp = dev->buf;
+ dev->buf_wp = dev->buf;
+ dev->buf_end = dev->buf + DRM_BSZ;
+ dev->buf_async = NULL;
+ init_waitqueue_head(&dev->buf_readers);
+ init_waitqueue_head(&dev->buf_writers);
+
+ tdfx_res_ctx.handle=-1;
+
+ DRM_DEBUG("\n");
+
+ /* The kernel's context could be created here, but is now created
+ in drm_dma_enqueue. This is more resource-efficient for
+ hardware that does not do DMA, but may mean that
+ drm_select_queue fails between the time the interrupt is
+ initialized and the time the queues are initialized. */
+
+ return 0;
+}
+
+
+static int tdfx_takedown(drm_device_t *dev)
+{
+ int i;
+ drm_magic_entry_t *pt, *next;
+ drm_map_t *map;
+ drm_vma_entry_t *vma, *vma_next;
+
+ DRM_DEBUG("\n");
+
+ down(&dev->struct_sem);
+ del_timer(&dev->timer);
+
+ if (dev->devname) {
+ drm_free(dev->devname, strlen(dev->devname)+1, DRM_MEM_DRIVER);
+ dev->devname = NULL;
+ }
+
+ if (dev->unique) {
+ drm_free(dev->unique, strlen(dev->unique)+1, DRM_MEM_DRIVER);
+ dev->unique = NULL;
+ dev->unique_len = 0;
+ }
+ /* Clear pid list */
+ for (i = 0; i < DRM_HASH_SIZE; i++) {
+ for (pt = dev->magiclist[i].head; pt; pt = next) {
+ next = pt->next;
+ drm_free(pt, sizeof(*pt), DRM_MEM_MAGIC);
+ }
+ dev->magiclist[i].head = dev->magiclist[i].tail = NULL;
+ }
+#if defined(CONFIG_AGP) || defined(CONFIG_AGP_MODULE)
+ /* Clear AGP information */
+ if (dev->agp) {
+ drm_agp_mem_t *temp;
+ drm_agp_mem_t *temp_next;
+
+ temp = dev->agp->memory;
+ while(temp != NULL) {
+ temp_next = temp->next;
+ drm_free_agp(temp->memory, temp->pages);
+ drm_free(temp, sizeof(*temp), DRM_MEM_AGPLISTS);
+ temp = temp_next;
+ }
+ if (dev->agp->acquired) _drm_agp_release();
+ }
+#endif
+ /* Clear vma list (only built for debugging) */
+ if (dev->vmalist) {
+ for (vma = dev->vmalist; vma; vma = vma_next) {
+ vma_next = vma->next;
+ drm_free(vma, sizeof(*vma), DRM_MEM_VMAS);
+ }
+ dev->vmalist = NULL;
+ }
+
+ /* Clear map area and mtrr information */
+ if (dev->maplist) {
+ for (i = 0; i < dev->map_count; i++) {
+ map = dev->maplist[i];
+ switch (map->type) {
+ case _DRM_REGISTERS:
+ case _DRM_FRAME_BUFFER:
+#ifdef CONFIG_MTRR
+ if (map->mtrr >= 0) {
+ int retcode;
+ retcode = mtrr_del(map->mtrr,
+ map->offset,
+ map->size);
+ DRM_DEBUG("mtrr_del = %d\n", retcode);
+ }
+#endif
+ drm_ioremapfree(map->handle, map->size);
+ break;
+ case _DRM_SHM:
+ drm_free_pages((unsigned long)map->handle,
+ drm_order(map->size)
+ - PAGE_SHIFT,
+ DRM_MEM_SAREA);
+ break;
+ case _DRM_AGP:
+ /* Do nothing here, because this is all
+ handled in the AGP/GART driver. */
+ break;
+ }
+ drm_free(map, sizeof(*map), DRM_MEM_MAPS);
+ }
+ drm_free(dev->maplist,
+ dev->map_count * sizeof(*dev->maplist),
+ DRM_MEM_MAPS);
+ dev->maplist = NULL;
+ dev->map_count = 0;
+ }
+
+ if (dev->lock.hw_lock) {
+ dev->lock.hw_lock = NULL; /* SHM removed */
+ dev->lock.pid = 0;
+ wake_up_interruptible(&dev->lock.lock_queue);
+ }
+ up(&dev->struct_sem);
+
+ return 0;
+}
+
+/* tdfx_init is called via init_module at module load time, or via
+ * linux/init/main.c (this is not currently supported). */
+
+static int __init tdfx_init(void)
+{
+ int retcode;
+ drm_device_t *dev = &tdfx_device;
+
+ DRM_DEBUG("\n");
+
+ memset((void *)dev, 0, sizeof(*dev));
+ dev->count_lock = SPIN_LOCK_UNLOCKED;
+ sema_init(&dev->struct_sem, 1);
+
+#ifdef MODULE
+ drm_parse_options(tdfx);
+#endif
+
+ if ((retcode = misc_register(&tdfx_misc))) {
+ DRM_ERROR("Cannot register \"%s\"\n", TDFX_NAME);
+ return retcode;
+ }
+ dev->device = MKDEV(MISC_MAJOR, tdfx_misc.minor);
+ dev->name = TDFX_NAME;
+
+ drm_mem_init();
+ drm_proc_init(dev);
+#if defined(CONFIG_AGP) || defined(CONFIG_AGP_MODULE)
+ dev->agp = drm_agp_init();
+#endif
+ if((retcode = drm_ctxbitmap_init(dev))) {
+ DRM_ERROR("Cannot allocate memory for context bitmap.\n");
+ drm_proc_cleanup();
+ misc_deregister(&tdfx_misc);
+ tdfx_takedown(dev);
+ return retcode;
+ }
+
+ DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n",
+ TDFX_NAME,
+ TDFX_MAJOR,
+ TDFX_MINOR,
+ TDFX_PATCHLEVEL,
+ TDFX_DATE,
+ tdfx_misc.minor);
+
+ return 0;
+}
+
+/* tdfx_cleanup is called via cleanup_module at module unload time. */
+
+static void __exit tdfx_cleanup(void)
+{
+ drm_device_t *dev = &tdfx_device;
+
+ DRM_DEBUG("\n");
+
+ drm_proc_cleanup();
+ if (misc_deregister(&tdfx_misc)) {
+ DRM_ERROR("Cannot unload module\n");
+ } else {
+ DRM_INFO("Module unloaded\n");
+ }
+ drm_ctxbitmap_cleanup(dev);
+ tdfx_takedown(dev);
+#if defined(CONFIG_AGP) || defined(CONFIG_AGP_MODULE)
+ if (dev->agp) {
+ drm_agp_uninit();
+ drm_free(dev->agp, sizeof(*dev->agp), DRM_MEM_AGPLISTS);
+ dev->agp = NULL;
+ }
+#endif
+}
+
+module_init(tdfx_init);
+module_exit(tdfx_cleanup);
+
+
+int tdfx_version(struct inode *inode, struct file *filp, unsigned int cmd,
+ unsigned long arg)
+{
+ drm_version_t version;
+ int len;
+
+ if (copy_from_user(&version,
+ (drm_version_t *)arg,
+ sizeof(version)))
+ return -EFAULT;
+
+#define DRM_COPY(name,value) \
+ len = strlen(value); \
+ if (len > name##_len) len = name##_len; \
+ name##_len = strlen(value); \
+ if (len && name) { \
+ if (copy_to_user(name, value, len)) \
+ return -EFAULT; \
+ }
+
+ version.version_major = TDFX_MAJOR;
+ version.version_minor = TDFX_MINOR;
+ version.version_patchlevel = TDFX_PATCHLEVEL;
+
+ DRM_COPY(version.name, TDFX_NAME);
+ DRM_COPY(version.date, TDFX_DATE);
+ DRM_COPY(version.desc, TDFX_DESC);
+
+ if (copy_to_user((drm_version_t *)arg,
+ &version,
+ sizeof(version)))
+ return -EFAULT;
+ return 0;
+}
+
+int tdfx_open(struct inode *inode, struct file *filp)
+{
+ drm_device_t *dev = &tdfx_device;
+ int retcode = 0;
+
+ DRM_DEBUG("open_count = %d\n", dev->open_count);
+ if (!(retcode = drm_open_helper(inode, filp, dev))) {
+#if LINUX_VERSION_CODE < 0x020333
+ MOD_INC_USE_COUNT; /* Needed before Linux 2.3.51 */
+#endif
+ atomic_inc(&dev->total_open);
+ spin_lock(&dev->count_lock);
+ if (!dev->open_count++) {
+ spin_unlock(&dev->count_lock);
+ return tdfx_setup(dev);
+ }
+ spin_unlock(&dev->count_lock);
+ }
+ return retcode;
+}
+
+int tdfx_release(struct inode *inode, struct file *filp)
+{
+ drm_file_t *priv = filp->private_data;
+ drm_device_t *dev;
+ int retcode = 0;
+
+ lock_kernel();
+ dev = priv->dev;
+
+ DRM_DEBUG("open_count = %d\n", dev->open_count);
+ if (!(retcode = drm_release(inode, filp))) {
+#if LINUX_VERSION_CODE < 0x020333
+ MOD_DEC_USE_COUNT; /* Needed before Linux 2.3.51 */
+#endif
+ atomic_inc(&dev->total_close);
+ spin_lock(&dev->count_lock);
+ if (!--dev->open_count) {
+ if (atomic_read(&dev->ioctl_count) || dev->blocked) {
+ DRM_ERROR("Device busy: %d %d\n",
+ atomic_read(&dev->ioctl_count),
+ dev->blocked);
+ spin_unlock(&dev->count_lock);
+ unlock_kernel();
+ return -EBUSY;
+ }
+ spin_unlock(&dev->count_lock);
+ unlock_kernel();
+ return tdfx_takedown(dev);
+ }
+ spin_unlock(&dev->count_lock);
+ }
+
+ unlock_kernel();
+ return retcode;
+}
+
+/* tdfx_ioctl is called whenever a process performs an ioctl on /dev/drm. */
+
+int tdfx_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
+ unsigned long arg)
+{
+ int nr = DRM_IOCTL_NR(cmd);
+ drm_file_t *priv = filp->private_data;
+ drm_device_t *dev = priv->dev;
+ int retcode = 0;
+ drm_ioctl_desc_t *ioctl;
+ drm_ioctl_t *func;
+
+ atomic_inc(&dev->ioctl_count);
+ atomic_inc(&dev->total_ioctl);
+ ++priv->ioctl_count;
+
+ DRM_DEBUG("pid = %d, cmd = 0x%02x, nr = 0x%02x, dev 0x%x, auth = %d\n",
+ current->pid, cmd, nr, dev->device, priv->authenticated);
+
+ if (nr >= TDFX_IOCTL_COUNT) {
+ retcode = -EINVAL;
+ } else {
+ ioctl = &tdfx_ioctls[nr];
+ func = ioctl->func;
+
+ if (!func) {
+ DRM_DEBUG("no function\n");
+ retcode = -EINVAL;
+ } else if ((ioctl->root_only && !capable(CAP_SYS_ADMIN))
+ || (ioctl->auth_needed && !priv->authenticated)) {
+ retcode = -EACCES;
+ } else {
+ retcode = (func)(inode, filp, cmd, arg);
+ }
+ }
+
+ atomic_dec(&dev->ioctl_count);
+ return retcode;
+}
+
+int tdfx_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;
+#if DRM_DMA_HISTOGRAM
+ cycles_t start;
+
+ dev->lck_start = start = get_cycles();
+#endif
+
+ if (copy_from_user(&lock, (drm_lock_t *)arg, sizeof(lock)))
+ return -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 0
+ /* dev->queue_count == 0 right now for
+ tdfx. FIXME? */
+ if (lock.context < 0 || lock.context >= dev->queue_count)
+ return -EINVAL;
+#endif
+
+ if (!ret) {
+#if 0
+ if (_DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock)
+ != lock.context) {
+ long j = jiffies - dev->lock.lock_time;
+
+ if (lock.context == tdfx_res_ctx.handle &&
+ j >= 0 && j < DRM_LOCK_SLICE) {
+ /* Can't take lock if we just had it and
+ there is contention. */
+ DRM_DEBUG("%d (pid %d) delayed j=%d dev=%d jiffies=%d\n",
+ lock.context, current->pid, j,
+ dev->lock.lock_time, jiffies);
+ current->state = TASK_INTERRUPTIBLE;
+ current->policy |= SCHED_YIELD;
+ schedule_timeout(DRM_LOCK_SLICE-j);
+ DRM_DEBUG("jiffies=%d\n", jiffies);
+ }
+ }
+#endif
+ 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);
+#if 1
+ current->policy |= SCHED_YIELD;
+#endif
+ schedule();
+ if (signal_pending(current)) {
+ ret = -ERESTARTSYS;
+ break;
+ }
+ }
+ current->state = TASK_RUNNING;
+ remove_wait_queue(&dev->lock.lock_queue, &entry);
+ }
+
+#if 0
+ if (!ret && dev->last_context != lock.context &&
+ lock.context != tdfx_res_ctx.handle &&
+ dev->last_context != tdfx_res_ctx.handle) {
+ add_wait_queue(&dev->context_wait, &entry);
+ current->state = TASK_INTERRUPTIBLE;
+ /* PRE: dev->last_context != lock.context */
+ tdfx_context_switch(dev, dev->last_context, lock.context);
+ /* POST: we will wait for the context
+ switch and will dispatch on a later call
+ when dev->last_context == lock.context
+ NOTE WE HOLD THE LOCK THROUGHOUT THIS
+ TIME! */
+ current->policy |= SCHED_YIELD;
+ schedule();
+ current->state = TASK_RUNNING;
+ remove_wait_queue(&dev->context_wait, &entry);
+ if (signal_pending(current)) {
+ ret = -EINTR;
+ } else if (dev->last_context != lock.context) {
+ DRM_ERROR("Context mismatch: %d %d\n",
+ dev->last_context, lock.context);
+ }
+ }
+#endif
+
+ if (!ret) {
+ sigemptyset(&dev->sigmask);
+ sigaddset(&dev->sigmask, SIGSTOP);
+ sigaddset(&dev->sigmask, SIGTSTP);
+ sigaddset(&dev->sigmask, SIGTTIN);
+ sigaddset(&dev->sigmask, SIGTTOU);
+ dev->sigdata.context = lock.context;
+ dev->sigdata.lock = dev->lock.hw_lock;
+ block_all_signals(drm_notifier, &dev->sigdata, &dev->sigmask);
+
+ if (lock.flags & _DRM_LOCK_READY) {
+ /* Wait for space in DMA/FIFO */
+ }
+ if (lock.flags & _DRM_LOCK_QUIESCENT) {
+ /* Make hardware quiescent */
+#if 0
+ tdfx_quiescent(dev);
+#endif
+ }
+ }
+
+#if LINUX_VERSION_CODE < 0x020400
+ if (lock.context != tdfx_res_ctx.handle) {
+ current->counter = 5;
+ current->priority = DEF_PRIORITY/4;
+ }
+#endif
+ DRM_DEBUG("%d %s\n", lock.context, ret ? "interrupted" : "has lock");
+
+#if DRM_DMA_HISTOGRAM
+ atomic_inc(&dev->histo.lacq[drm_histogram_slot(get_cycles() - start)]);
+#endif
+
+ return ret;
+}
+
+
+int tdfx_unlock(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;
+
+ if (copy_from_user(&lock, (drm_lock_t *)arg, sizeof(lock)))
+ return -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 frees lock (%d holds)\n",
+ lock.context,
+ _DRM_LOCKING_CONTEXT(dev->lock.hw_lock->lock));
+ atomic_inc(&dev->total_unlocks);
+ if (_DRM_LOCK_IS_CONT(dev->lock.hw_lock->lock))
+ atomic_inc(&dev->total_contends);
+ drm_lock_transfer(dev, &dev->lock.hw_lock->lock, DRM_KERNEL_CONTEXT);
+ /* FIXME: Try to send data to card here */
+ if (!dev->context_flag) {
+ if (drm_lock_free(dev, &dev->lock.hw_lock->lock,
+ DRM_KERNEL_CONTEXT)) {
+ DRM_ERROR("\n");
+ }
+ }
+
+#if LINUX_VERSION_CODE < 0x020400
+ if (lock.context != tdfx_res_ctx.handle) {
+ current->counter = 5;
+ current->priority = DEF_PRIORITY;
+ }
+#endif
+
+ unblock_all_signals();
+ return 0;
+}
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)