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/*-
* 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>
*
*/
/** @file drm_context.c
* Implementation of the context management ioctls.
*/
#include "drmP.h"
/* ================================================================
* Context bitmap support
*/
void
drm_ctxbitmap_free(struct drm_device *dev, int ctx_handle)
{
if (ctx_handle < 0 || ctx_handle >= DRM_MAX_CTXBITMAP ||
dev->ctx_bitmap == NULL) {
DRM_ERROR("Attempt to free invalid context handle: %d\n",
ctx_handle);
return;
}
DRM_LOCK();
clear_bit(ctx_handle, dev->ctx_bitmap);
DRM_UNLOCK();
return;
}
int
drm_ctxbitmap_next(struct drm_device *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\n", bit);
if ((bit+1) > dev->max_context)
dev->max_context = (bit+1);
DRM_UNLOCK();
return bit;
}
int
drm_ctxbitmap_init(struct drm_device *dev)
{
int i;
int temp;
DRM_LOCK();
dev->ctx_bitmap = drm_calloc(1, PAGE_SIZE, DRM_MEM_CTXBITMAP);
if (dev->ctx_bitmap == NULL) {
DRM_UNLOCK();
return ENOMEM;
}
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\n", temp);
}
return 0;
}
void
drm_ctxbitmap_cleanup(struct drm_device *dev)
{
DRM_LOCK();
drm_free(dev->ctx_bitmap, PAGE_SIZE, DRM_MEM_CTXBITMAP);
DRM_UNLOCK();
}
int
drm_resctx(struct drm_device *dev, void *data, struct drm_file *file_priv)
{
drm_ctx_res_t *res = data;
drm_ctx_t ctx;
int i;
if (res->count >= DRM_RESERVED_CONTEXTS) {
bzero(&ctx, sizeof(ctx));
for (i = 0; i < DRM_RESERVED_CONTEXTS; i++) {
ctx.handle = i;
if (DRM_COPY_TO_USER(&res->contexts[i],
&ctx, sizeof(ctx)))
return EFAULT;
}
}
res->count = DRM_RESERVED_CONTEXTS;
return 0;
}
int
drm_addctx(struct drm_device *dev, void *data, struct drm_file *file_priv)
{
drm_ctx_t *ctx = data;
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);
}
DRM_DEBUG("%d\n", ctx->handle);
if (ctx->handle == -1) {
DRM_DEBUG("Not enough free contexts.\n");
/* Should this return -EBUSY instead? */
return ENOMEM;
}
if (dev->driver.context_ctor && ctx->handle != DRM_KERNEL_CONTEXT) {
DRM_LOCK();
dev->driver.context_ctor(dev, ctx->handle);
DRM_UNLOCK();
}
return 0;
}
int
drm_getctx(struct drm_device *dev, void *data, struct drm_file *file_priv)
{
drm_ctx_t *ctx = data;
/* This is 0, because we don't handle any context flags */
ctx->flags = 0;
return 0;
}
int
drm_rmctx(struct drm_device *dev, void *data, struct drm_file *file_priv)
{
drm_ctx_t *ctx = data;
DRM_DEBUG("%d\n", 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;
}
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