--- old/usr/src/uts/common/io/drm/drm_context.c	Sun May 28 15:47:11 2017
+++ /dev/null	Sun May 28 15:44:56 2017
@@ -1,447 +0,0 @@
-/*
- * 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);
-}
