linux-core/Kconfig


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#
# Drm device configuration
#
# This driver provides support for the
# Direct Rendering Infrastructure (DRI) in XFree86 4.1.0 and higher.
#
config DRM
	bool "Direct Rendering Manager (XFree86 4.1.0 and higher DRI support)"
	help
	  Kernel-level support for the Direct Rendering Infrastructure (DRI)
	  introduced in XFree86 4.0. If you say Y here, you need to select
	  the module that's right for your graphics card from the list below.
	  These modules provide support for synchronization, security, and
	  DMA transfers. Please see <http://dri.sourceforge.net/> for more
	  details.  You should also select and configure AGP
	  (/dev/agpgart) support.

config DRM_TDFX
	tristate "3dfx Banshee/Voodoo3+"
	depends on DRM && PCI
	help
	  Choose this option if you have a 3dfx Banshee or Voodoo3 (or later),
	  graphics card.  If M is selected, the module will be called tdfx.

config DRM_R128
	tristate "ATI Rage 128"
	depends on DRM && PCI
	help
	  Choose this option if you have an ATI Rage 128 graphics card.  If M
	  is selected, the module will be called r128.  AGP support for
	  this card is strongly suggested (unless you have a PCI version).

config DRM_RADEON
	tristate "ATI Radeon"
	depends on DRM && PCI
	help
	  Choose this option if you have an ATI Radeon graphics card.  There
	  are both PCI and AGP versions.  You don't need to choose this to
	  run the Radeon in plain VGA mode.  There is a product page at
	  <http://www.ati.com/na/pages/products/pc/radeon32/index.html>.
	  If M is selected, the module will be called radeon.

config DRM_I810
	tristate "Intel I810"
	depends on DRM && AGP && AGP_INTEL
	help
	  Choose this option if you have an Intel I810 graphics card.  If M is
	  selected, the module will be called i810.  AGP support is required
	  for this driver to work.

choice
	prompt "Intel 830M, 845G, 852GM, 855GM, 865G"
	depends on DRM && AGP && AGP_INTEL
	optional

config DRM_I915
	tristate "i915 driver"
	help
	  Choose this option if you have a system that has Intel 830M, 845G,
	  852GM, 855GM, 865G, 915G, 915GM, 945G, 945GM and 965G integrated 
	  graphics.  If M is selected, the module will be called i915.  
	  AGP support is required for this driver to work.
	
endchoice

config DRM_MGA
	tristate "Matrox g200/g400"
	depends on DRM && (!X86_64 || BROKEN) && (!PPC || BROKEN)
	help
	  Choose this option if you have a Matrox G200, G400, G450 or G550
	  graphics card.  If M is selected, the module will be called mga.

config DRM_SIS
	tristate "SiS video cards"
	depends on DRM
	help
	  Choose this option if you have a SiS 630 or compatible video 
	  chipset. If M is selected the module will be called sis.

config DRM_VIA
	tristate "Via unichrome video cards"
	depends on DRM 
	help
	  Choose this option if you have a Via unichrome or compatible video 
	  chipset. If M is selected the module will be called via.

config DRM_MACH64
	tristate "ATI Rage Pro (Mach64)"
	depends on DRM && PCI
	help
	  Choose this option if you have an ATI Rage Pro (mach64 chipset)
	  graphics card.  Example cards include:  3D Rage Pro, Xpert 98,
	  3D Rage LT Pro, 3D Rage XL/XC, and 3D Rage Mobility (P/M, M1).
	  Cards earlier than ATI Rage Pro (e.g. Rage II) are not supported.
	  If M is selected, the module will be called mach64.  AGP support for
	  this card is strongly suggested (unless you have a PCI version).
/* 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>
 *
 */

#include "drmP.h"

/* ================================================================
 * 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("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(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\n", 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 = realloc(dev->context_sareas,
			    dev->max_context * sizeof(*dev->context_sareas),
			    M_DRM, M_NOWAIT);
			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 = malloc(dev->max_context * 
			    sizeof(*dev->context_sareas), M_DRM, M_NOWAIT);
			if (dev->context_sareas == NULL) {
				clear_bit(bit, dev->ctx_bitmap);
				DRM_UNLOCK();
				return -1;
			}
			dev->context_sareas[bit] = NULL;
		}
	}
	DRM_UNLOCK();
	return bit;
}

int drm_ctxbitmap_init(drm_device_t *dev)
{
	int i;
   	int temp;

	DRM_LOCK();
	dev->ctx_bitmap = malloc(PAGE_SIZE, M_DRM, M_NOWAIT | M_ZERO);
	if ( dev->ctx_bitmap == NULL ) {
		DRM_UNLOCK();
		return DRM_ERR(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(drm_device_t *dev)
{
	DRM_LOCK();
	if (dev->context_sareas != NULL)
		free(dev->context_sareas, M_DRM);
	free(dev->ctx_bitmap, M_DRM);
	DRM_UNLOCK();
}

/* ================================================================
 * Per Context SAREA Support
 */

int drm_getsareactx( DRM_IOCTL_ARGS )
{
	DRM_DEVICE;
	drm_ctx_priv_map_t request;
	drm_local_map_t *map;

	DRM_COPY_FROM_USER_IOCTL( request, (drm_ctx_priv_map_t *)data, 
			   sizeof(request) );

	DRM_LOCK();
	if (dev->max_context < 0 || request.ctx_id >= (unsigned) dev->max_context) {
		DRM_UNLOCK();
		return DRM_ERR(EINVAL);
	}

	map = dev->context_sareas[request.ctx_id];
	DRM_UNLOCK();

	request.handle = map->handle;

	DRM_COPY_TO_USER_IOCTL( (drm_ctx_priv_map_t *)data, request, sizeof(request) );

	return 0;
}

int drm_setsareactx( DRM_IOCTL_ARGS )
{
	DRM_DEVICE;
	drm_ctx_priv_map_t request;
	drm_local_map_t *map = NULL;

	DRM_COPY_FROM_USER_IOCTL( request, (drm_ctx_priv_map_t *)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 DRM_ERR(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( "Reentering -- FIXME\n" );
                return DRM_ERR(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(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( "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(DRM_IOCTL_ARGS)
{
	drm_ctx_res_t res;
	drm_ctx_t ctx;
	int i;

	DRM_COPY_FROM_USER_IOCTL( res, (drm_ctx_res_t *)data, sizeof(res) );

	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 DRM_ERR(EFAULT);
		}
	}
	res.count = DRM_RESERVED_CONTEXTS;

	DRM_COPY_TO_USER_IOCTL( (drm_ctx_res_t *)data, res, sizeof(res) );

	return 0;
}

int drm_addctx(DRM_IOCTL_ARGS)
{
	DRM_DEVICE;
	drm_ctx_t ctx;

	DRM_COPY_FROM_USER_IOCTL( ctx, (drm_ctx_t *)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);
	}
	DRM_DEBUG( "%d\n", ctx.handle );
	if ( ctx.handle == -1 ) {
		DRM_DEBUG( "Not enough free contexts.\n" );
				/* Should this return -EBUSY instead? */
		return DRM_ERR(ENOMEM);
	}

	if (dev->driver.context_ctor && ctx.handle != DRM_KERNEL_CONTEXT) {
		DRM_LOCK();
		dev->driver.context_ctor(dev, ctx.handle);
		DRM_UNLOCK();
	}

	DRM_COPY_TO_USER_IOCTL( (drm_ctx_t *)data, ctx, sizeof(ctx) );

	return 0;
}

int drm_modctx(DRM_IOCTL_ARGS)
{
	/* This does nothing */
	return 0;
}

int drm_getctx(DRM_IOCTL_ARGS)
{
	drm_ctx_t ctx;

	DRM_COPY_FROM_USER_IOCTL( ctx, (drm_ctx_t *)data, sizeof(ctx) );

	/* This is 0, because we don't handle any context flags */
	ctx.flags = 0;

	DRM_COPY_TO_USER_IOCTL( (drm_ctx_t *)data, ctx, sizeof(ctx) );

	return 0;
}

int drm_switchctx(DRM_IOCTL_ARGS)
{
	DRM_DEVICE;
	drm_ctx_t ctx;

	DRM_COPY_FROM_USER_IOCTL( ctx, (drm_ctx_t *)data, sizeof(ctx) );

	DRM_DEBUG( "%d\n", ctx.handle );
	return drm_context_switch(dev, dev->last_context, ctx.handle);
}

int drm_newctx(DRM_IOCTL_ARGS)
{
	DRM_DEVICE;
	drm_ctx_t ctx;

	DRM_COPY_FROM_USER_IOCTL( ctx, (drm_ctx_t *)data, sizeof(ctx) );

	DRM_DEBUG( "%d\n", ctx.handle );
	drm_context_switch_complete(dev, ctx.handle);

	return 0;
}

int drm_rmctx(DRM_IOCTL_ARGS)
{
	DRM_DEVICE;
	drm_ctx_t ctx;