/*
* 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);
}