1 files changed, 447 insertions, 0 deletions
diff --git a/usr/src/uts/common/io/drm/drm_context.c b/usr/src/uts/common/io/drm/drm_context.c
new file mode 100644
index 0000000..16c141f
--- /dev/null
+++ b/usr/src/uts/common/io/drm/drm_context.c
@@ -0,0 +1,447 @@
+/*
+ * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+/*
+ * drm_context.h -- IOCTLs for generic contexts -*- linux-c -*-
+ * Created: Fri Nov 24 18:31:37 2000 by gareth@valinux.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
+ * 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>
+ *
+ */
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+#include "drmP.h"
+#include "drm_io32.h"
+
+static inline int
+find_first_zero_bit(volatile void *p, int max)
+{
+	int b;
+	volatile int *ptr = (volatile int *)p;
+
+	for (b = 0; b < max; b += 32) {
+		if (ptr[b >> 5] != ~0) {
+			for (;;) {
+				if ((ptr[b >> 5] & (1 << (b & 0x1f))) == 0)
+					return (b);
+				b++;
+			}
+		}
+	}
+	return (max);
+}
+
+/*
+ * Context bitmap support
+ */
+void
+drm_ctxbitmap_free(drm_device_t *dev, int ctx_handle)
+{
+	if (ctx_handle < 0 || ctx_handle >= DRM_MAX_CTXBITMAP ||
+	    dev->ctx_bitmap == NULL) {
+		DRM_ERROR("drm_ctxbitmap_free: Attempt to free\
+		    invalid context handle: %d\n",
+		    ctx_handle);
+		return;
+	}
+
+	DRM_LOCK();
+	clear_bit(ctx_handle, dev->ctx_bitmap);
+	dev->context_sareas[ctx_handle] = NULL;
+	DRM_UNLOCK();
+}
+
+/* Is supposed to return -1 if  any error by calling functions */
+int
+drm_ctxbitmap_next(drm_device_t *dev)
+{
+	int bit;
+
+	if (dev->ctx_bitmap == NULL)
+		return (-1);
+
+	DRM_LOCK();
+	bit = find_first_zero_bit(dev->ctx_bitmap, DRM_MAX_CTXBITMAP);
+	if (bit >= DRM_MAX_CTXBITMAP) {
+		DRM_UNLOCK();
+		return (-1);
+	}
+
+	set_bit(bit, dev->ctx_bitmap);
+	DRM_DEBUG("drm_ctxbitmap_next: bit : %d", bit);
+	if ((bit+1) > dev->max_context) {
+		dev->max_context = (bit+1);
+		if (dev->context_sareas != NULL) {
+			drm_local_map_t **ctx_sareas;
+			ctx_sareas = drm_realloc(dev->context_sareas,
+			    (dev->max_context - 1) *
+			    sizeof (*dev->context_sareas),
+			    dev->max_context *
+			    sizeof (*dev->context_sareas),
+			    DRM_MEM_MAPS);
+			if (ctx_sareas == NULL) {
+				clear_bit(bit, dev->ctx_bitmap);
+				DRM_UNLOCK();
+				return (-1);
+			}
+			dev->context_sareas = ctx_sareas;
+			dev->context_sareas[bit] = NULL;
+		} else {
+			/* max_context == 1 at this point */
+			dev->context_sareas = drm_alloc(dev->max_context *
+			    sizeof (*dev->context_sareas), KM_NOSLEEP);
+			if (dev->context_sareas == NULL) {
+				clear_bit(bit, dev->ctx_bitmap);
+				DRM_UNLOCK();
+				return (-1);
+			}
+			dev->context_sareas[bit] = NULL;
+		}
+	}
+	DRM_UNLOCK();
+	DRM_DEBUG("drm_ctxbitmap_next: return %d", bit);
+	return (bit);
+}
+
+int
+drm_ctxbitmap_init(drm_device_t *dev)
+{
+	int i;
+	int temp;
+
+	DRM_LOCK();
+	dev->ctx_bitmap = drm_calloc(1, DRM_PAGE_SIZE, DRM_MEM_CTXBITMAP);
+	if (dev->ctx_bitmap == NULL) {
+		DRM_UNLOCK();
+		return (ENOMEM);
+	}
+	dev->context_sareas = NULL;
+	dev->max_context = -1;
+	DRM_UNLOCK();
+
+	for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) {
+		temp = drm_ctxbitmap_next(dev);
+		DRM_DEBUG("drm_ctxbitmap_init : %d", temp);
+	}
+	return (0);
+}
+
+void
+drm_ctxbitmap_cleanup(drm_device_t *dev)
+{
+	DRM_LOCK();
+	if (dev->context_sareas != NULL)
+		drm_free(dev->context_sareas,
+		    sizeof (*dev->context_sareas) *
+		    dev->max_context,
+		    DRM_MEM_MAPS);
+	drm_free(dev->ctx_bitmap, DRM_PAGE_SIZE, DRM_MEM_CTXBITMAP);
+	DRM_UNLOCK();
+}
+
+/*
+ * Per Context SAREA Support
+ */
+/*ARGSUSED*/
+int
+drm_getsareactx(DRM_IOCTL_ARGS)
+{
+	DRM_DEVICE;
+	drm_ctx_priv_map_t request;
+	drm_local_map_t *map;
+
+#ifdef	_MULTI_DATAMODEL
+	if (ddi_model_convert_from(mode & FMODELS) == DDI_MODEL_ILP32) {
+		drm_ctx_priv_map_32_t request32;
+		DRM_COPYFROM_WITH_RETURN(&request32, (void *)data,
+		    sizeof (drm_ctx_priv_map_32_t));
+		request.ctx_id = request32.ctx_id;
+		request.handle = (void *)(uintptr_t)request32.handle;
+	} else
+#endif
+		DRM_COPYFROM_WITH_RETURN(&request, (void *)data,
+		    sizeof (request));
+
+	DRM_LOCK();
+	if (dev->max_context < 0 || request.ctx_id >= (unsigned)
+	    dev->max_context) {
+		DRM_UNLOCK();
+		return (EINVAL);
+	}
+
+	map = dev->context_sareas[request.ctx_id];
+	DRM_UNLOCK();
+
+	if (!map)
+		return (EINVAL);
+
+	request.handle = map->handle;
+
+#ifdef	_MULTI_DATAMODEL
+	if (ddi_model_convert_from(mode & FMODELS) == DDI_MODEL_ILP32) {
+		drm_ctx_priv_map_32_t request32;
+		request32.ctx_id = request.ctx_id;
+		request32.handle = (caddr32_t)(uintptr_t)request.handle;
+		DRM_COPYTO_WITH_RETURN((void *)data, &request32,
+		    sizeof (drm_ctx_priv_map_32_t));
+	} else
+#endif
+		DRM_COPYTO_WITH_RETURN((void *)data,
+		    &request, sizeof (request));
+
+	return (0);
+}
+
+/*ARGSUSED*/
+int
+drm_setsareactx(DRM_IOCTL_ARGS)
+{
+	DRM_DEVICE;
+	drm_ctx_priv_map_t request;
+	drm_local_map_t *map = NULL;
+
+#ifdef	_MULTI_DATAMODEL
+	if (ddi_model_convert_from(mode & FMODELS) == DDI_MODEL_ILP32) {
+		drm_ctx_priv_map_32_t request32;
+
+		DRM_COPYFROM_WITH_RETURN(&request32, (void *)data,
+		    sizeof (drm_ctx_priv_map_32_t));
+		request.ctx_id = request32.ctx_id;
+		request.handle = (void *)(uintptr_t)request32.handle;
+	} else
+#endif
+		DRM_COPYFROM_WITH_RETURN(&request,
+		    (void *)data, sizeof (request));
+
+	DRM_LOCK();
+	TAILQ_FOREACH(map, &dev->maplist, link) {
+		if (map->handle == request.handle) {
+			if (dev->max_context < 0)
+				goto bad;
+			if (request.ctx_id >= (unsigned)dev->max_context)
+				goto bad;
+			dev->context_sareas[request.ctx_id] = map;
+			DRM_UNLOCK();
+			return (0);
+		}
+	}
+
+bad:
+	DRM_UNLOCK();
+	return (EINVAL);
+}
+
+/*
+ * The actual DRM context handling routines
+ */
+int
+drm_context_switch(drm_device_t *dev, int old, int new)
+{
+	if (test_and_set_bit(0, &dev->context_flag)) {
+		DRM_ERROR("drm_context_switch: Reentering -- FIXME");
+		return (EBUSY);
+	}
+
+	DRM_DEBUG("drm_context_switch: Context switch from %d to %d",
+	    old, new);
+
+	if (new == dev->last_context) {
+		clear_bit(0, &dev->context_flag);
+		return (0);
+	}
+
+	return (0);
+}
+
+int
+drm_context_switch_complete(drm_device_t *dev, int new)
+{
+	dev->last_context = new;  /* PRE/POST: This is the _only_ writer. */
+
+	if (!_DRM_LOCK_IS_HELD(dev->lock.hw_lock->lock)) {
+		DRM_ERROR(
+		    "drm_context_switch_complete: Lock not held");
+	}
+	/*
+	 * If a context switch is ever initiated
+	 * when the kernel holds the lock, release
+	 * that lock here.
+	 */
+	clear_bit(0, &dev->context_flag);
+
+	return (0);
+}
+
+/*ARGSUSED*/
+int
+drm_resctx(DRM_IOCTL_ARGS)
+{
+	drm_ctx_res_t res;
+	drm_ctx_t ctx;
+	int i;
+
+#ifdef	_MULTI_DATAMODEL
+	if (ddi_model_convert_from(mode & FMODELS) == DDI_MODEL_ILP32) {
+		drm_ctx_res_32_t res32;
+		DRM_COPYFROM_WITH_RETURN(&res32, (void *)data, sizeof (res32));
+		res.count = res32.count;
+		res.contexts = (drm_ctx_t *)(uintptr_t)res32.contexts;
+	} else
+#endif
+		DRM_COPYFROM_WITH_RETURN(&res, (void *)data, sizeof (res));
+
+	if (res.count >= DRM_RESERVED_CONTEXTS) {
+		bzero(&ctx, sizeof (ctx));
+		for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) {
+			ctx.handle = i;
+			DRM_COPYTO_WITH_RETURN(&res.contexts[i],
+			    &ctx, sizeof (ctx));
+		}
+	}
+	res.count = DRM_RESERVED_CONTEXTS;
+
+#ifdef	_MULTI_DATAMODEL
+	if (ddi_model_convert_from(mode & FMODELS) == DDI_MODEL_ILP32) {
+		drm_ctx_res_32_t res32;
+		res32.count = res.count;
+		res32.contexts = (caddr32_t)(uintptr_t)res.contexts;
+
+		DRM_COPYTO_WITH_RETURN((void *)data, &res32,
+		    sizeof (drm_ctx_res_32_t));
+	} else
+#endif
+		DRM_COPYTO_WITH_RETURN((void *)data, &res, sizeof (res));
+
+	return (0);
+}
+
+/*ARGSUSED*/
+int
+drm_addctx(DRM_IOCTL_ARGS)
+{
+	DRM_DEVICE;
+	drm_ctx_t ctx;
+
+	DRM_COPYFROM_WITH_RETURN(&ctx, (void *)data, sizeof (ctx));
+
+	ctx.handle = drm_ctxbitmap_next(dev);
+	if (ctx.handle == DRM_KERNEL_CONTEXT) {
+		/* Skip kernel's context and get a new one. */
+		ctx.handle = drm_ctxbitmap_next(dev);
+	}
+	if (ctx.handle == (drm_context_t)-1) {
+		return (ENOMEM);
+	}
+
+	if (dev->driver->context_ctor && ctx.handle != DRM_KERNEL_CONTEXT) {
+		dev->driver->context_ctor(dev, ctx.handle);
+	}
+
+	DRM_COPYTO_WITH_RETURN((void *)data, &ctx, sizeof (ctx));
+
+	return (0);
+}
+
+/*ARGSUSED*/
+int
+drm_modctx(DRM_IOCTL_ARGS)
+{
+	/* This does nothing */
+	return (0);
+}
+
+/*ARGSUSED*/
+int
+drm_getctx(DRM_IOCTL_ARGS)
+{
+	drm_ctx_t ctx;
+
+	DRM_COPYFROM_WITH_RETURN(&ctx, (void *)data, sizeof (ctx));
+
+	/* This is 0, because we don't handle any context flags */
+	ctx.flags = 0;
+
+	DRM_COPYTO_WITH_RETURN((void *)data, &ctx, sizeof (ctx));
+
+	return (0);
+}
+
+/*ARGSUSED*/
+int
+drm_switchctx(DRM_IOCTL_ARGS)
+{
+	DRM_DEVICE;
+	drm_ctx_t ctx;
+
+	DRM_COPYFROM_WITH_RETURN(&ctx, (void *)data, sizeof (ctx));
+
+	DRM_DEBUG("drm_switchctx: %d", ctx.handle);
+	return (drm_context_switch(dev, dev->last_context, ctx.handle));
+}
+
+/*ARGSUSED*/
+int
+drm_newctx(DRM_IOCTL_ARGS)
+{
+	DRM_DEVICE;
+	drm_ctx_t ctx;
+
+	DRM_COPYFROM_WITH_RETURN(&ctx, (void *)data, sizeof (ctx));
+
+	DRM_DEBUG("drm_newctx: %d", ctx.handle);
+	(void) drm_context_switch_complete(dev, ctx.handle);
+
+	return (0);
+}
+
+/*ARGSUSED*/
+int
+drm_rmctx(DRM_IOCTL_ARGS)
+{
+	DRM_DEVICE;
+	drm_ctx_t ctx;
+
+	DRM_COPYFROM_WITH_RETURN(&ctx, (void *)data, sizeof (ctx));
+
+	DRM_DEBUG("drm_rmctx : %d", ctx.handle);
+	if (ctx.handle != DRM_KERNEL_CONTEXT) {
+		if (dev->driver->context_dtor) {
+			DRM_LOCK();
+			dev->driver->context_dtor(dev, ctx.handle);
+			DRM_UNLOCK();
+		}
+
+		drm_ctxbitmap_free(dev, ctx.handle);
+	}
+
+	return (0);
+}