freebsd-dev/sys/dev/agp/agp_sis.c
Alfred Perlstein 2395531439 Introduce a global lock for the vm subsystem (vm_mtx).
vm_mtx does not recurse and is required for most low level
vm operations.

faults can not be taken without holding Giant.

Memory subsystems can now call the base page allocators safely.

Almost all atomic ops were removed as they are covered under the
vm mutex.

Alpha and ia64 now need to catch up to i386's trap handlers.

FFS and NFS have been tested, other filesystems will need minor
changes (grabbing the vm lock when twiddling page properties).

Reviewed (partially) by: jake, jhb
2001-05-19 01:28:09 +00:00

258 lines
6.2 KiB
C

/*-
* Copyright (c) 2000 Doug Rabson
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include "opt_bus.h"
#include "opt_pci.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/bus.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <pci/pcivar.h>
#include <pci/pcireg.h>
#include <pci/agppriv.h>
#include <pci/agpreg.h>
#include <vm/vm.h>
#include <vm/vm_object.h>
#include <vm/pmap.h>
struct agp_sis_softc {
struct agp_softc agp;
u_int32_t initial_aperture; /* aperture size at startup */
struct agp_gatt *gatt;
};
static const char*
agp_sis_match(device_t dev)
{
if (pci_get_class(dev) != PCIC_BRIDGE
|| pci_get_subclass(dev) != PCIS_BRIDGE_HOST)
return NULL;
if (agp_find_caps(dev) == 0)
return NULL;
switch (pci_get_devid(dev)) {
case 0x00011039:
return ("SiS 5591 host to AGP bridge");
};
if (pci_get_vendor(dev) == 0x1039)
return ("SIS Generic host to PCI bridge");
return NULL;
}
static int
agp_sis_probe(device_t dev)
{
const char *desc;
desc = agp_sis_match(dev);
if (desc) {
device_verbose(dev);
device_set_desc(dev, desc);
return 0;
}
return ENXIO;
}
static int
agp_sis_attach(device_t dev)
{
struct agp_sis_softc *sc = device_get_softc(dev);
struct agp_gatt *gatt;
int error;
error = agp_generic_attach(dev);
if (error)
return error;
sc->initial_aperture = AGP_GET_APERTURE(dev);
for (;;) {
gatt = agp_alloc_gatt(dev);
if (gatt)
break;
/*
* Probably contigmalloc failure. Try reducing the
* aperture so that the gatt size reduces.
*/
if (AGP_SET_APERTURE(dev, AGP_GET_APERTURE(dev) / 2)) {
agp_generic_detach(dev);
return ENOMEM;
}
}
sc->gatt = gatt;
/* Install the gatt. */
pci_write_config(dev, AGP_SIS_ATTBASE, gatt->ag_physical, 4);
/* Enable the aperture. */
pci_write_config(dev, AGP_SIS_WINCTRL,
pci_read_config(dev, AGP_SIS_WINCTRL, 1) | 3, 1);
/*
* Enable the TLB and make it automatically invalidate entries
* when the GATT is written.
*/
pci_write_config(dev, AGP_SIS_TLBCTRL, 0x05, 1);
return 0;
}
static int
agp_sis_detach(device_t dev)
{
struct agp_sis_softc *sc = device_get_softc(dev);
int error;
error = agp_generic_detach(dev);
if (error)
return error;
/* Disable the aperture.. */
pci_write_config(dev, AGP_SIS_WINCTRL,
pci_read_config(dev, AGP_SIS_WINCTRL, 1) & ~3, 1);
/* and the TLB. */
pci_write_config(dev, AGP_SIS_TLBCTRL, 0, 1);
/* Put the aperture back the way it started. */
AGP_SET_APERTURE(dev, sc->initial_aperture);
agp_free_gatt(sc->gatt);
return 0;
}
static u_int32_t
agp_sis_get_aperture(device_t dev)
{
int gws;
/*
* The aperture size is equal to 4M<<gws.
*/
gws = (pci_read_config(dev, AGP_SIS_WINCTRL, 1) & 0x70) >> 4;
return (4*1024*1024) << gws;
}
static int
agp_sis_set_aperture(device_t dev, u_int32_t aperture)
{
int gws;
/*
* Check for a power of two and make sure its within the
* programmable range.
*/
if (aperture & (aperture - 1)
|| aperture < 4*1024*1024
|| aperture > 256*1024*1024)
return EINVAL;
gws = ffs(aperture / 4*1024*1024) - 1;
pci_write_config(dev, AGP_SIS_WINCTRL,
((pci_read_config(dev, AGP_SIS_WINCTRL, 1) & ~0x70)
| gws << 4), 1);
return 0;
}
static int
agp_sis_bind_page(device_t dev, int offset, vm_offset_t physical)
{
struct agp_sis_softc *sc = device_get_softc(dev);
if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
return EINVAL;
sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = physical;
return 0;
}
static int
agp_sis_unbind_page(device_t dev, int offset)
{
struct agp_sis_softc *sc = device_get_softc(dev);
if (offset < 0 || offset >= (sc->gatt->ag_entries << AGP_PAGE_SHIFT))
return EINVAL;
sc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0;
return 0;
}
static void
agp_sis_flush_tlb(device_t dev)
{
pci_write_config(dev, AGP_SIS_TLBFLUSH, 0x02, 1);
}
static device_method_t agp_sis_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, agp_sis_probe),
DEVMETHOD(device_attach, agp_sis_attach),
DEVMETHOD(device_detach, agp_sis_detach),
DEVMETHOD(device_shutdown, bus_generic_shutdown),
DEVMETHOD(device_suspend, bus_generic_suspend),
DEVMETHOD(device_resume, bus_generic_resume),
/* AGP interface */
DEVMETHOD(agp_get_aperture, agp_sis_get_aperture),
DEVMETHOD(agp_set_aperture, agp_sis_set_aperture),
DEVMETHOD(agp_bind_page, agp_sis_bind_page),
DEVMETHOD(agp_unbind_page, agp_sis_unbind_page),
DEVMETHOD(agp_flush_tlb, agp_sis_flush_tlb),
DEVMETHOD(agp_enable, agp_generic_enable),
DEVMETHOD(agp_alloc_memory, agp_generic_alloc_memory),
DEVMETHOD(agp_free_memory, agp_generic_free_memory),
DEVMETHOD(agp_bind_memory, agp_generic_bind_memory),
DEVMETHOD(agp_unbind_memory, agp_generic_unbind_memory),
{ 0, 0 }
};
static driver_t agp_sis_driver = {
"agp",
agp_sis_methods,
sizeof(struct agp_sis_softc),
};
static devclass_t agp_devclass;
DRIVER_MODULE(agp_sis, pci, agp_sis_driver, agp_devclass, 0, 0);