freebsd-dev/sys/dev/drm/drm_context.c
Warner Losh 592ffb2175 Revert drm2 removal.
Revert r338177, r338176, r338175, r338174, r338172

After long consultations with re@, core members and mmacy, revert
these changes. Followup changes will be made to mark them as
deprecated and prent a message about where to find the up-to-date
driver.  Followup commits will be made to make this clear in the
installer. Followup commits to reduce POLA in ways we're still
exploring.

It's anticipated that after the freeze, this will be removed in
13-current (with the residual of the drm2 code copied to
sys/arm/dev/drm2 for the TEGRA port's use w/o the intel or
radeon drivers).

Due to the impending freeze, there was no formal core vote for
this. I've been talking to different core members all day, as well as
Matt Macey and Glen Barber. Nobody is completely happy, all are
grudgingly going along with this. Work is in progress to mitigate
the negative effects as much as possible.

Requested by: re@ (gjb, rgrimes)
2018-08-24 00:02:00 +00:00

313 lines
7.3 KiB
C

/*-
* 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>
*
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/** @file drm_context.c
* Implementation of the context management ioctls.
*/
#include "dev/drm/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);
dev->context_sareas[ctx_handle] = NULL;
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("bit : %d\n", bit);
if ((bit+1) > dev->max_context) {
drm_local_map_t **ctx_sareas;
int max_ctx = (bit+1);
ctx_sareas = realloc(dev->context_sareas,
max_ctx * sizeof(*dev->context_sareas),
DRM_MEM_SAREA, M_NOWAIT);
if (ctx_sareas == NULL) {
clear_bit(bit, dev->ctx_bitmap);
DRM_DEBUG("failed to allocate bit : %d\n", bit);
DRM_UNLOCK();
return -1;
}
dev->max_context = max_ctx;
dev->context_sareas = ctx_sareas;
dev->context_sareas[bit] = NULL;
}
DRM_UNLOCK();
return bit;
}
int drm_ctxbitmap_init(struct drm_device *dev)
{
int i;
int temp;
DRM_LOCK();
dev->ctx_bitmap = malloc(PAGE_SIZE, DRM_MEM_CTXBITMAP,
M_NOWAIT | M_ZERO);
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\n", temp);
}
return 0;
}
void drm_ctxbitmap_cleanup(struct drm_device *dev)
{
DRM_LOCK();
if (dev->context_sareas != NULL)
free(dev->context_sareas, DRM_MEM_SAREA);
free(dev->ctx_bitmap, DRM_MEM_CTXBITMAP);
DRM_UNLOCK();
}
/* ================================================================
* Per Context SAREA Support
*/
int drm_getsareactx(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
struct drm_ctx_priv_map *request = data;
drm_local_map_t *map;
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();
request->handle = (void *)map->handle;
return 0;
}
int drm_setsareactx(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
struct drm_ctx_priv_map *request = data;
drm_local_map_t *map = NULL;
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(struct drm_device *dev, int old, int new)
{
if (test_and_set_bit(0, &dev->context_flag)) {
DRM_ERROR("Reentering -- FIXME\n");
return EBUSY;
}
DRM_DEBUG("Context switch from %d to %d\n", old, new);
if (new == dev->last_context) {
clear_bit(0, &dev->context_flag);
return 0;
}
return 0;
}
int drm_context_switch_complete(struct drm_device *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("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. */
clear_bit(0, &dev->context_flag);
return 0;
}
int drm_resctx(struct drm_device *dev, void *data, struct drm_file *file_priv)
{
struct drm_ctx_res *res = data;
struct drm_ctx 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)
{
struct drm_ctx *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_modctx(struct drm_device *dev, void *data, struct drm_file *file_priv)
{
/* This does nothing */
return 0;
}
int drm_getctx(struct drm_device *dev, void *data, struct drm_file *file_priv)
{
struct drm_ctx *ctx = data;
/* This is 0, because we don't handle any context flags */
ctx->flags = 0;
return 0;
}
int drm_switchctx(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
struct drm_ctx *ctx = data;
DRM_DEBUG("%d\n", ctx->handle);
return drm_context_switch(dev, dev->last_context, ctx->handle);
}
int drm_newctx(struct drm_device *dev, void *data, struct drm_file *file_priv)
{
struct drm_ctx *ctx = data;
DRM_DEBUG("%d\n", ctx->handle);
drm_context_switch_complete(dev, ctx->handle);
return 0;
}
int drm_rmctx(struct drm_device *dev, void *data, struct drm_file *file_priv)
{
struct drm_ctx *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;
}