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-rw-r--r--linux/mach64_context.c211
1 files changed, 211 insertions, 0 deletions
diff --git a/linux/mach64_context.c b/linux/mach64_context.c
new file mode 100644
index 00000000..ec3580d2
--- /dev/null
+++ b/linux/mach64_context.c
@@ -0,0 +1,211 @@
+/* mach64_context.c -- IOCTLs for mach64 contexts -*- linux-c -*-
+ * Created: Mon Dec 13 09:51:35 1999 by gareth@valinux.com
+ *
+ * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
+ * Copyright 2000 Gareth Hughes
+ * 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>
+ * Gareth Hughes <gareth@valinux.com>
+ *
+ */
+
+#define __NO_VERSION__
+#include "drmP.h"
+#include "mach64_drv.h"
+
+static int mach64_alloc_queue(drm_device_t *dev)
+{
+ int temp = drm_ctxbitmap_next(dev);
+ DRM_DEBUG("mach64_alloc_queue: %d\n", temp);
+ return temp;
+}
+
+int mach64_context_switch(drm_device_t *dev, int old, int new)
+{
+ char buf[64];
+
+ 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->last_context) {
+ clear_bit(0, &dev->context_flag);
+ return 0;
+ }
+
+ if (drm_flags & DRM_FLAG_NOCTX) {
+ mach64_context_switch_complete(dev, new);
+ } else {
+ sprintf(buf, "C %d %d\n", old, new);
+ drm_write_string(dev, buf);
+ }
+
+ return 0;
+}
+
+int mach64_context_switch_complete(drm_device_t *dev, int new)
+{
+ 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 a context switch is ever initiated
+ when the kernel holds the lock, release
+ that lock here. */
+#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(&dev->context_wait);
+
+ return 0;
+}
+
+int mach64_resctx(struct inode *inode, struct file *filp,
+ unsigned int cmd, unsigned long arg)
+{
+ drm_ctx_res_t res;
+ drm_ctx_t ctx;
+ int i;
+
+ DRM_DEBUG("%d\n", DRM_RESERVED_CONTEXTS);
+ if (copy_from_user(&res, (drm_ctx_res_t *)arg, sizeof(res)))
+ return -EFAULT;
+ if (res.count >= DRM_RESERVED_CONTEXTS) {
+ memset(&ctx, 0, sizeof(ctx));
+ for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) {
+ ctx.handle = i;
+ if (copy_to_user(&res.contexts[i], &i, sizeof(i)))
+ return -EFAULT;
+ }
+ }
+ res.count = DRM_RESERVED_CONTEXTS;
+ if (copy_to_user((drm_ctx_res_t *)arg, &res, sizeof(res)))
+ return -EFAULT;
+ return 0;
+}
+
+int mach64_addctx(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_ctx_t ctx;
+
+ if (copy_from_user(&ctx, (drm_ctx_t *)arg, sizeof(ctx)))
+ return -EFAULT;
+ if ((ctx.handle = mach64_alloc_queue(dev)) == DRM_KERNEL_CONTEXT) {
+ /* Skip kernel's context and get a new one. */
+ ctx.handle = mach64_alloc_queue(dev);
+ }
+ if (ctx.handle == -1) {
+ DRM_DEBUG("Not enough free contexts.\n");
+ /* Should this return -EBUSY instead? */
+ return -ENOMEM;
+ }
+ DRM_DEBUG("%d\n", ctx.handle);
+ if (copy_to_user((drm_ctx_t *)arg, &ctx, sizeof(ctx)))
+ return -EFAULT;
+ return 0;
+}
+
+int mach64_modctx(struct inode *inode, struct file *filp,
+ unsigned int cmd, unsigned long arg)
+{
+ /* This does nothing for the mach64 */
+ return 0;
+}
+
+int mach64_getctx(struct inode *inode, struct file *filp,
+ unsigned int cmd, unsigned long arg)
+{
+ drm_ctx_t ctx;
+
+ if (copy_from_user(&ctx, (drm_ctx_t*)arg, sizeof(ctx)))
+ return -EFAULT;
+ /* This is 0, because we don't hanlde any context flags */
+ ctx.flags = 0;
+ if (copy_to_user((drm_ctx_t*)arg, &ctx, sizeof(ctx)))
+ return -EFAULT;
+ return 0;
+}
+
+int mach64_switchctx(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_ctx_t ctx;
+
+ if (copy_from_user(&ctx, (drm_ctx_t *)arg, sizeof(ctx)))
+ return -EFAULT;
+ DRM_DEBUG("%d\n", ctx.handle);
+ return mach64_context_switch(dev, dev->last_context, ctx.handle);
+}
+
+int mach64_newctx(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_ctx_t ctx;
+
+ if (copy_from_user(&ctx, (drm_ctx_t *)arg, sizeof(ctx)))
+ return -EFAULT;
+ DRM_DEBUG("%d\n", ctx.handle);
+ mach64_context_switch_complete(dev, ctx.handle);
+
+ return 0;
+}
+
+int mach64_rmctx(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_ctx_t ctx;
+
+ if (copy_from_user(&ctx, (drm_ctx_t *)arg, sizeof(ctx)))
+ return -EFAULT;
+ DRM_DEBUG("%d\n", ctx.handle);
+ if(ctx.handle != DRM_KERNEL_CONTEXT) {
+ drm_ctxbitmap_free(dev, ctx.handle);
+ }
+
+ return 0;
+}
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