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freebsd-skq/sys/dev/agp/agp.c
alc 3799d78beb Eliminate the arena parameter to kmem_free(). Implicitly this corrects an 
error in the function hypercall_memfree(), where the wrong arena was being
passed to kmem_free().

Introduce a per-page flag, VPO_KMEM_EXEC, to mark physical pages that are
mapped in kmem with execute permissions.  Use this flag to determine which
arena the kmem virtual addresses are returned to.

Eliminate UMA_SLAB_KRWX.  The introduction of VPO_KMEM_EXEC makes it
redundant.

Update the nearby comment for UMA_SLAB_KERNEL.

Reviewed by:	kib, markj
Discussed with:	jeff
Approved by:	re (marius)
Differential Revision:	https://reviews.freebsd.org/D16845
2018-08-25 19:38:08 +00:00

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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_agp.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/ioccom.h>
#include <sys/agpio.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/rwlock.h>
#include <dev/agp/agppriv.h>
#include <dev/agp/agpvar.h>
#include <dev/agp/agpreg.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
#include <vm/vm.h>
#include <vm/vm_extern.h>
#include <vm/vm_kern.h>
#include <vm/vm_param.h>
#include <vm/vm_object.h>
#include <vm/vm_page.h>
#include <vm/vm_pageout.h>
#include <vm/pmap.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <sys/rman.h>
MODULE_VERSION(agp, 1);
MALLOC_DEFINE(M_AGP, "agp", "AGP data structures");
/* agp_drv.c */
static d_open_t agp_open;
static d_close_t agp_close;
static d_ioctl_t agp_ioctl;
static d_mmap_t agp_mmap;
static struct cdevsw agp_cdevsw = {
.d_version = D_VERSION,
.d_flags = D_NEEDGIANT,
.d_open = agp_open,
.d_close = agp_close,
.d_ioctl = agp_ioctl,
.d_mmap = agp_mmap,
.d_name = "agp",
};
static devclass_t agp_devclass;
/* Helper functions for implementing chipset mini drivers. */
u_int8_t
agp_find_caps(device_t dev)
{
int capreg;
if (pci_find_cap(dev, PCIY_AGP, &capreg) != 0)
capreg = 0;
return (capreg);
}
/*
* Find an AGP display device (if any).
*/
static device_t
agp_find_display(void)
{
devclass_t pci = devclass_find("pci");
device_t bus, dev = 0;
device_t *kids;
int busnum, numkids, i;
for (busnum = 0; busnum < devclass_get_maxunit(pci); busnum++) {
bus = devclass_get_device(pci, busnum);
if (!bus)
continue;
if (device_get_children(bus, &kids, &numkids) != 0)
continue;
for (i = 0; i < numkids; i++) {
dev = kids[i];
if (pci_get_class(dev) == PCIC_DISPLAY
&& pci_get_subclass(dev) == PCIS_DISPLAY_VGA)
if (agp_find_caps(dev)) {
free(kids, M_TEMP);
return dev;
}
}
free(kids, M_TEMP);
}
return 0;
}
struct agp_gatt *
agp_alloc_gatt(device_t dev)
{
u_int32_t apsize = AGP_GET_APERTURE(dev);
u_int32_t entries = apsize >> AGP_PAGE_SHIFT;
struct agp_gatt *gatt;
if (bootverbose)
device_printf(dev,
"allocating GATT for aperture of size %dM\n",
apsize / (1024*1024));
if (entries == 0) {
device_printf(dev, "bad aperture size\n");
return NULL;
}
gatt = malloc(sizeof(struct agp_gatt), M_AGP, M_NOWAIT);
if (!gatt)
return 0;
gatt->ag_entries = entries;
gatt->ag_virtual = (void *)kmem_alloc_contig(entries *
sizeof(u_int32_t), M_NOWAIT | M_ZERO, 0, ~0, PAGE_SIZE, 0,
VM_MEMATTR_WRITE_COMBINING);
if (!gatt->ag_virtual) {
if (bootverbose)
device_printf(dev, "contiguous allocation failed\n");
free(gatt, M_AGP);
return 0;
}
gatt->ag_physical = vtophys((vm_offset_t) gatt->ag_virtual);
return gatt;
}
void
agp_free_gatt(struct agp_gatt *gatt)
{
kmem_free((vm_offset_t)gatt->ag_virtual, gatt->ag_entries *
sizeof(u_int32_t));
free(gatt, M_AGP);
}
static u_int agp_max[][2] = {
{0, 0},
{32, 4},
{64, 28},
{128, 96},
{256, 204},
{512, 440},
{1024, 942},
{2048, 1920},
{4096, 3932}
};
#define AGP_MAX_SIZE nitems(agp_max)
/**
* Sets the PCI resource which represents the AGP aperture.
*
* If not called, the default AGP aperture resource of AGP_APBASE will
* be used. Must be called before agp_generic_attach().
*/
void
agp_set_aperture_resource(device_t dev, int rid)
{
struct agp_softc *sc = device_get_softc(dev);
sc->as_aperture_rid = rid;
}
int
agp_generic_attach(device_t dev)
{
struct agp_softc *sc = device_get_softc(dev);
int i;
u_int memsize;
/*
* Find and map the aperture, RF_SHAREABLE for DRM but not RF_ACTIVE
* because the kernel doesn't need to map it.
*/
if (sc->as_aperture_rid != -1) {
if (sc->as_aperture_rid == 0)
sc->as_aperture_rid = AGP_APBASE;
sc->as_aperture = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
&sc->as_aperture_rid, RF_SHAREABLE);
if (!sc->as_aperture)
return ENOMEM;
}
/*
* Work out an upper bound for agp memory allocation. This
* uses a heurisitc table from the Linux driver.
*/
memsize = ptoa(realmem) >> 20;
for (i = 0; i < AGP_MAX_SIZE; i++) {
if (memsize <= agp_max[i][0])
break;
}
if (i == AGP_MAX_SIZE)
i = AGP_MAX_SIZE - 1;
sc->as_maxmem = agp_max[i][1] << 20U;
/*
* The lock is used to prevent re-entry to
* agp_generic_bind_memory() since that function can sleep.
*/
mtx_init(&sc->as_lock, "agp lock", NULL, MTX_DEF);
/*
* Initialise stuff for the userland device.
*/
agp_devclass = devclass_find("agp");
TAILQ_INIT(&sc->as_memory);
sc->as_nextid = 1;
sc->as_devnode = make_dev(&agp_cdevsw,
0, UID_ROOT, GID_WHEEL, 0600, "agpgart");
sc->as_devnode->si_drv1 = dev;
return 0;
}
void
agp_free_cdev(device_t dev)
{
struct agp_softc *sc = device_get_softc(dev);
destroy_dev(sc->as_devnode);
}
void
agp_free_res(device_t dev)
{
struct agp_softc *sc = device_get_softc(dev);
if (sc->as_aperture != NULL)
bus_release_resource(dev, SYS_RES_MEMORY, sc->as_aperture_rid,
sc->as_aperture);
mtx_destroy(&sc->as_lock);
}
int
agp_generic_detach(device_t dev)
{
agp_free_cdev(dev);
agp_free_res(dev);
return 0;
}
/**
* Default AGP aperture size detection which simply returns the size of
* the aperture's PCI resource.
*/
u_int32_t
agp_generic_get_aperture(device_t dev)
{
struct agp_softc *sc = device_get_softc(dev);
return rman_get_size(sc->as_aperture);
}
/**
* Default AGP aperture size setting function, which simply doesn't allow
* changes to resource size.
*/
int
agp_generic_set_aperture(device_t dev, u_int32_t aperture)
{
u_int32_t current_aperture;
current_aperture = AGP_GET_APERTURE(dev);
if (current_aperture != aperture)
return EINVAL;
else
return 0;
}
/*
* This does the enable logic for v3, with the same topology
* restrictions as in place for v2 -- one bus, one device on the bus.
*/
static int
agp_v3_enable(device_t dev, device_t mdev, u_int32_t mode)
{
u_int32_t tstatus, mstatus;
u_int32_t command;
int rq, sba, fw, rate, arqsz, cal;
tstatus = pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
mstatus = pci_read_config(mdev, agp_find_caps(mdev) + AGP_STATUS, 4);
/* Set RQ to the min of mode, tstatus and mstatus */
rq = AGP_MODE_GET_RQ(mode);
if (AGP_MODE_GET_RQ(tstatus) < rq)
rq = AGP_MODE_GET_RQ(tstatus);
if (AGP_MODE_GET_RQ(mstatus) < rq)
rq = AGP_MODE_GET_RQ(mstatus);
/*
* ARQSZ - Set the value to the maximum one.
* Don't allow the mode register to override values.
*/
arqsz = AGP_MODE_GET_ARQSZ(mode);
if (AGP_MODE_GET_ARQSZ(tstatus) > rq)
rq = AGP_MODE_GET_ARQSZ(tstatus);
if (AGP_MODE_GET_ARQSZ(mstatus) > rq)
rq = AGP_MODE_GET_ARQSZ(mstatus);
/* Calibration cycle - don't allow override by mode register */
cal = AGP_MODE_GET_CAL(tstatus);
if (AGP_MODE_GET_CAL(mstatus) < cal)
cal = AGP_MODE_GET_CAL(mstatus);
/* SBA must be supported for AGP v3. */
sba = 1;
/* Set FW if all three support it. */
fw = (AGP_MODE_GET_FW(tstatus)
& AGP_MODE_GET_FW(mstatus)
& AGP_MODE_GET_FW(mode));
/* Figure out the max rate */
rate = (AGP_MODE_GET_RATE(tstatus)
& AGP_MODE_GET_RATE(mstatus)
& AGP_MODE_GET_RATE(mode));
if (rate & AGP_MODE_V3_RATE_8x)
rate = AGP_MODE_V3_RATE_8x;
else
rate = AGP_MODE_V3_RATE_4x;
if (bootverbose)
device_printf(dev, "Setting AGP v3 mode %d\n", rate * 4);
pci_write_config(dev, agp_find_caps(dev) + AGP_COMMAND, 0, 4);
/* Construct the new mode word and tell the hardware */
command = 0;
command = AGP_MODE_SET_RQ(0, rq);
command = AGP_MODE_SET_ARQSZ(command, arqsz);
command = AGP_MODE_SET_CAL(command, cal);
command = AGP_MODE_SET_SBA(command, sba);
command = AGP_MODE_SET_FW(command, fw);
command = AGP_MODE_SET_RATE(command, rate);
command = AGP_MODE_SET_MODE_3(command, 1);
command = AGP_MODE_SET_AGP(command, 1);
pci_write_config(dev, agp_find_caps(dev) + AGP_COMMAND, command, 4);
pci_write_config(mdev, agp_find_caps(mdev) + AGP_COMMAND, command, 4);
return 0;
}
static int
agp_v2_enable(device_t dev, device_t mdev, u_int32_t mode)
{
u_int32_t tstatus, mstatus;
u_int32_t command;
int rq, sba, fw, rate;
tstatus = pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
mstatus = pci_read_config(mdev, agp_find_caps(mdev) + AGP_STATUS, 4);
/* Set RQ to the min of mode, tstatus and mstatus */
rq = AGP_MODE_GET_RQ(mode);
if (AGP_MODE_GET_RQ(tstatus) < rq)
rq = AGP_MODE_GET_RQ(tstatus);
if (AGP_MODE_GET_RQ(mstatus) < rq)
rq = AGP_MODE_GET_RQ(mstatus);
/* Set SBA if all three can deal with SBA */
sba = (AGP_MODE_GET_SBA(tstatus)
& AGP_MODE_GET_SBA(mstatus)
& AGP_MODE_GET_SBA(mode));
/* Similar for FW */
fw = (AGP_MODE_GET_FW(tstatus)
& AGP_MODE_GET_FW(mstatus)
& AGP_MODE_GET_FW(mode));
/* Figure out the max rate */
rate = (AGP_MODE_GET_RATE(tstatus)
& AGP_MODE_GET_RATE(mstatus)
& AGP_MODE_GET_RATE(mode));
if (rate & AGP_MODE_V2_RATE_4x)
rate = AGP_MODE_V2_RATE_4x;
else if (rate & AGP_MODE_V2_RATE_2x)
rate = AGP_MODE_V2_RATE_2x;
else
rate = AGP_MODE_V2_RATE_1x;
if (bootverbose)
device_printf(dev, "Setting AGP v2 mode %d\n", rate);
/* Construct the new mode word and tell the hardware */
command = 0;
command = AGP_MODE_SET_RQ(0, rq);
command = AGP_MODE_SET_SBA(command, sba);
command = AGP_MODE_SET_FW(command, fw);
command = AGP_MODE_SET_RATE(command, rate);
command = AGP_MODE_SET_AGP(command, 1);
pci_write_config(dev, agp_find_caps(dev) + AGP_COMMAND, command, 4);
pci_write_config(mdev, agp_find_caps(mdev) + AGP_COMMAND, command, 4);
return 0;
}
int
agp_generic_enable(device_t dev, u_int32_t mode)
{
device_t mdev = agp_find_display();
u_int32_t tstatus, mstatus;
if (!mdev) {
AGP_DPF("can't find display\n");
return ENXIO;
}
tstatus = pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
mstatus = pci_read_config(mdev, agp_find_caps(mdev) + AGP_STATUS, 4);
/*
* Check display and bridge for AGP v3 support. AGP v3 allows
* more variety in topology than v2, e.g. multiple AGP devices
* attached to one bridge, or multiple AGP bridges in one
* system. This doesn't attempt to address those situations,
* but should work fine for a classic single AGP slot system
* with AGP v3.
*/
if (AGP_MODE_GET_MODE_3(mode) &&
AGP_MODE_GET_MODE_3(tstatus) &&
AGP_MODE_GET_MODE_3(mstatus))
return (agp_v3_enable(dev, mdev, mode));
else
return (agp_v2_enable(dev, mdev, mode));
}
struct agp_memory *
agp_generic_alloc_memory(device_t dev, int type, vm_size_t size)
{
struct agp_softc *sc = device_get_softc(dev);
struct agp_memory *mem;
if ((size & (AGP_PAGE_SIZE - 1)) != 0)
return 0;
if (size > sc->as_maxmem - sc->as_allocated)
return 0;
if (type != 0) {
printf("agp_generic_alloc_memory: unsupported type %d\n",
type);
return 0;
}
mem = malloc(sizeof *mem, M_AGP, M_WAITOK);
mem->am_id = sc->as_nextid++;
mem->am_size = size;
mem->am_type = 0;
mem->am_obj = vm_object_allocate(OBJT_DEFAULT, atop(round_page(size)));
mem->am_physical = 0;
mem->am_offset = 0;
mem->am_is_bound = 0;
TAILQ_INSERT_TAIL(&sc->as_memory, mem, am_link);
sc->as_allocated += size;
return mem;
}
int
agp_generic_free_memory(device_t dev, struct agp_memory *mem)
{
struct agp_softc *sc = device_get_softc(dev);
if (mem->am_is_bound)
return EBUSY;
sc->as_allocated -= mem->am_size;
TAILQ_REMOVE(&sc->as_memory, mem, am_link);
vm_object_deallocate(mem->am_obj);
free(mem, M_AGP);
return 0;
}
int
agp_generic_bind_memory(device_t dev, struct agp_memory *mem,
vm_offset_t offset)
{
struct agp_softc *sc = device_get_softc(dev);
vm_offset_t i, j, k;
vm_page_t m;
int error;
/* Do some sanity checks first. */
if ((offset & (AGP_PAGE_SIZE - 1)) != 0 ||
offset + mem->am_size > AGP_GET_APERTURE(dev)) {
device_printf(dev, "binding memory at bad offset %#x\n",
(int)offset);
return EINVAL;
}
/*
* Allocate the pages early, before acquiring the lock,
* because vm_page_grab() may sleep and we can't hold a mutex
* while sleeping.
*/
VM_OBJECT_WLOCK(mem->am_obj);
for (i = 0; i < mem->am_size; i += PAGE_SIZE) {
/*
* Find a page from the object and wire it
* down. This page will be mapped using one or more
* entries in the GATT (assuming that PAGE_SIZE >=
* AGP_PAGE_SIZE. If this is the first call to bind,
* the pages will be allocated and zeroed.
*/
m = vm_page_grab(mem->am_obj, OFF_TO_IDX(i),
VM_ALLOC_WIRED | VM_ALLOC_ZERO);
AGP_DPF("found page pa=%#jx\n", (uintmax_t)VM_PAGE_TO_PHYS(m));
}
VM_OBJECT_WUNLOCK(mem->am_obj);
mtx_lock(&sc->as_lock);
if (mem->am_is_bound) {
device_printf(dev, "memory already bound\n");
error = EINVAL;
VM_OBJECT_WLOCK(mem->am_obj);
i = 0;
goto bad;
}
/*
* Bind the individual pages and flush the chipset's
* TLB.
*/
VM_OBJECT_WLOCK(mem->am_obj);
for (i = 0; i < mem->am_size; i += PAGE_SIZE) {
m = vm_page_lookup(mem->am_obj, OFF_TO_IDX(i));
/*
* Install entries in the GATT, making sure that if
* AGP_PAGE_SIZE < PAGE_SIZE and mem->am_size is not
* aligned to PAGE_SIZE, we don't modify too many GATT
* entries.
*/
for (j = 0; j < PAGE_SIZE && i + j < mem->am_size;
j += AGP_PAGE_SIZE) {
vm_offset_t pa = VM_PAGE_TO_PHYS(m) + j;
AGP_DPF("binding offset %#jx to pa %#jx\n",
(uintmax_t)offset + i + j, (uintmax_t)pa);
error = AGP_BIND_PAGE(dev, offset + i + j, pa);
if (error) {
/*
* Bail out. Reverse all the mappings
* and unwire the pages.
*/
for (k = 0; k < i + j; k += AGP_PAGE_SIZE)
AGP_UNBIND_PAGE(dev, offset + k);
goto bad;
}
}
vm_page_xunbusy(m);
}
VM_OBJECT_WUNLOCK(mem->am_obj);
/*
* Make sure the chipset gets the new mappings.
*/
AGP_FLUSH_TLB(dev);
mem->am_offset = offset;
mem->am_is_bound = 1;
mtx_unlock(&sc->as_lock);
return 0;
bad:
mtx_unlock(&sc->as_lock);
VM_OBJECT_ASSERT_WLOCKED(mem->am_obj);
for (k = 0; k < mem->am_size; k += PAGE_SIZE) {
m = vm_page_lookup(mem->am_obj, OFF_TO_IDX(k));
if (k >= i)
vm_page_xunbusy(m);
vm_page_lock(m);
vm_page_unwire(m, PQ_INACTIVE);
vm_page_unlock(m);
}
VM_OBJECT_WUNLOCK(mem->am_obj);
return error;
}
int
agp_generic_unbind_memory(device_t dev, struct agp_memory *mem)
{
struct agp_softc *sc = device_get_softc(dev);
vm_page_t m;
int i;
mtx_lock(&sc->as_lock);
if (!mem->am_is_bound) {
device_printf(dev, "memory is not bound\n");
mtx_unlock(&sc->as_lock);
return EINVAL;
}
/*
* Unbind the individual pages and flush the chipset's
* TLB. Unwire the pages so they can be swapped.
*/
for (i = 0; i < mem->am_size; i += AGP_PAGE_SIZE)
AGP_UNBIND_PAGE(dev, mem->am_offset + i);
AGP_FLUSH_TLB(dev);
VM_OBJECT_WLOCK(mem->am_obj);
for (i = 0; i < mem->am_size; i += PAGE_SIZE) {
m = vm_page_lookup(mem->am_obj, atop(i));
vm_page_lock(m);
vm_page_unwire(m, PQ_INACTIVE);
vm_page_unlock(m);
}
VM_OBJECT_WUNLOCK(mem->am_obj);
mem->am_offset = 0;
mem->am_is_bound = 0;
mtx_unlock(&sc->as_lock);
return 0;
}
/* Helper functions for implementing user/kernel api */
static int
agp_acquire_helper(device_t dev, enum agp_acquire_state state)
{
struct agp_softc *sc = device_get_softc(dev);
if (sc->as_state != AGP_ACQUIRE_FREE)
return EBUSY;
sc->as_state = state;
return 0;
}
static int
agp_release_helper(device_t dev, enum agp_acquire_state state)
{
struct agp_softc *sc = device_get_softc(dev);
if (sc->as_state == AGP_ACQUIRE_FREE)
return 0;
if (sc->as_state != state)
return EBUSY;
sc->as_state = AGP_ACQUIRE_FREE;
return 0;
}
static struct agp_memory *
agp_find_memory(device_t dev, int id)
{
struct agp_softc *sc = device_get_softc(dev);
struct agp_memory *mem;
AGP_DPF("searching for memory block %d\n", id);
TAILQ_FOREACH(mem, &sc->as_memory, am_link) {
AGP_DPF("considering memory block %d\n", mem->am_id);
if (mem->am_id == id)
return mem;
}
return 0;
}
/* Implementation of the userland ioctl api */
static int
agp_info_user(device_t dev, agp_info *info)
{
struct agp_softc *sc = device_get_softc(dev);
bzero(info, sizeof *info);
info->bridge_id = pci_get_devid(dev);
info->agp_mode =
pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
if (sc->as_aperture)
info->aper_base = rman_get_start(sc->as_aperture);
else
info->aper_base = 0;
info->aper_size = AGP_GET_APERTURE(dev) >> 20;
info->pg_total = info->pg_system = sc->as_maxmem >> AGP_PAGE_SHIFT;
info->pg_used = sc->as_allocated >> AGP_PAGE_SHIFT;
return 0;
}
static int
agp_setup_user(device_t dev, agp_setup *setup)
{
return AGP_ENABLE(dev, setup->agp_mode);
}
static int
agp_allocate_user(device_t dev, agp_allocate *alloc)
{
struct agp_memory *mem;
mem = AGP_ALLOC_MEMORY(dev,
alloc->type,
alloc->pg_count << AGP_PAGE_SHIFT);
if (mem) {
alloc->key = mem->am_id;
alloc->physical = mem->am_physical;
return 0;
} else {
return ENOMEM;
}
}
static int
agp_deallocate_user(device_t dev, int id)
{
struct agp_memory *mem = agp_find_memory(dev, id);
if (mem) {
AGP_FREE_MEMORY(dev, mem);
return 0;
} else {
return ENOENT;
}
}
static int
agp_bind_user(device_t dev, agp_bind *bind)
{
struct agp_memory *mem = agp_find_memory(dev, bind->key);
if (!mem)
return ENOENT;
return AGP_BIND_MEMORY(dev, mem, bind->pg_start << AGP_PAGE_SHIFT);
}
static int
agp_unbind_user(device_t dev, agp_unbind *unbind)
{
struct agp_memory *mem = agp_find_memory(dev, unbind->key);
if (!mem)
return ENOENT;
return AGP_UNBIND_MEMORY(dev, mem);
}
static int
agp_chipset_flush(device_t dev)
{
return (AGP_CHIPSET_FLUSH(dev));
}
static int
agp_open(struct cdev *kdev, int oflags, int devtype, struct thread *td)
{
device_t dev = kdev->si_drv1;
struct agp_softc *sc = device_get_softc(dev);
if (!sc->as_isopen) {
sc->as_isopen = 1;
device_busy(dev);
}
return 0;
}
static int
agp_close(struct cdev *kdev, int fflag, int devtype, struct thread *td)
{
device_t dev = kdev->si_drv1;
struct agp_softc *sc = device_get_softc(dev);
struct agp_memory *mem;
/*
* Clear the GATT and force release on last close
*/
while ((mem = TAILQ_FIRST(&sc->as_memory)) != NULL) {
if (mem->am_is_bound)
AGP_UNBIND_MEMORY(dev, mem);
AGP_FREE_MEMORY(dev, mem);
}
if (sc->as_state == AGP_ACQUIRE_USER)
agp_release_helper(dev, AGP_ACQUIRE_USER);
sc->as_isopen = 0;
device_unbusy(dev);
return 0;
}
static int
agp_ioctl(struct cdev *kdev, u_long cmd, caddr_t data, int fflag, struct thread *td)
{
device_t dev = kdev->si_drv1;
switch (cmd) {
case AGPIOC_INFO:
return agp_info_user(dev, (agp_info *) data);
case AGPIOC_ACQUIRE:
return agp_acquire_helper(dev, AGP_ACQUIRE_USER);
case AGPIOC_RELEASE:
return agp_release_helper(dev, AGP_ACQUIRE_USER);
case AGPIOC_SETUP:
return agp_setup_user(dev, (agp_setup *)data);
case AGPIOC_ALLOCATE:
return agp_allocate_user(dev, (agp_allocate *)data);
case AGPIOC_DEALLOCATE:
return agp_deallocate_user(dev, *(int *) data);
case AGPIOC_BIND:
return agp_bind_user(dev, (agp_bind *)data);
case AGPIOC_UNBIND:
return agp_unbind_user(dev, (agp_unbind *)data);
case AGPIOC_CHIPSET_FLUSH:
return agp_chipset_flush(dev);
}
return EINVAL;
}
static int
agp_mmap(struct cdev *kdev, vm_ooffset_t offset, vm_paddr_t *paddr,
int prot, vm_memattr_t *memattr)
{
device_t dev = kdev->si_drv1;
struct agp_softc *sc = device_get_softc(dev);
if (offset > AGP_GET_APERTURE(dev))
return -1;
if (sc->as_aperture == NULL)
return -1;
*paddr = rman_get_start(sc->as_aperture) + offset;
return 0;
}
/* Implementation of the kernel api */
device_t
agp_find_device()
{
device_t *children, child;
int i, count;
if (!agp_devclass)
return NULL;
if (devclass_get_devices(agp_devclass, &children, &count) != 0)
return NULL;
child = NULL;
for (i = 0; i < count; i++) {
if (device_is_attached(children[i])) {
child = children[i];
break;
}
}
free(children, M_TEMP);
return child;
}
enum agp_acquire_state
agp_state(device_t dev)
{
struct agp_softc *sc = device_get_softc(dev);
return sc->as_state;
}
void
agp_get_info(device_t dev, struct agp_info *info)
{
struct agp_softc *sc = device_get_softc(dev);
info->ai_mode =
pci_read_config(dev, agp_find_caps(dev) + AGP_STATUS, 4);
if (sc->as_aperture != NULL)
info->ai_aperture_base = rman_get_start(sc->as_aperture);
else
info->ai_aperture_base = 0;
info->ai_aperture_size = AGP_GET_APERTURE(dev);
info->ai_memory_allowed = sc->as_maxmem;
info->ai_memory_used = sc->as_allocated;
}
int
agp_acquire(device_t dev)
{
return agp_acquire_helper(dev, AGP_ACQUIRE_KERNEL);
}
int
agp_release(device_t dev)
{
return agp_release_helper(dev, AGP_ACQUIRE_KERNEL);
}
int
agp_enable(device_t dev, u_int32_t mode)
{
return AGP_ENABLE(dev, mode);
}
void *agp_alloc_memory(device_t dev, int type, vm_size_t bytes)
{
return (void *) AGP_ALLOC_MEMORY(dev, type, bytes);
}
void agp_free_memory(device_t dev, void *handle)
{
struct agp_memory *mem = (struct agp_memory *) handle;
AGP_FREE_MEMORY(dev, mem);
}
int agp_bind_memory(device_t dev, void *handle, vm_offset_t offset)
{
struct agp_memory *mem = (struct agp_memory *) handle;
return AGP_BIND_MEMORY(dev, mem, offset);
}
int agp_unbind_memory(device_t dev, void *handle)
{
struct agp_memory *mem = (struct agp_memory *) handle;
return AGP_UNBIND_MEMORY(dev, mem);
}
void agp_memory_info(device_t dev, void *handle, struct
agp_memory_info *mi)
{
struct agp_memory *mem = (struct agp_memory *) handle;
mi->ami_size = mem->am_size;
mi->ami_physical = mem->am_physical;
mi->ami_offset = mem->am_offset;
mi->ami_is_bound = mem->am_is_bound;
}
int
agp_bind_pages(device_t dev, vm_page_t *pages, vm_size_t size,
vm_offset_t offset)
{
struct agp_softc *sc;
vm_offset_t i, j, k, pa;
vm_page_t m;
int error;
if ((size & (AGP_PAGE_SIZE - 1)) != 0 ||
(offset & (AGP_PAGE_SIZE - 1)) != 0)
return (EINVAL);
sc = device_get_softc(dev);
mtx_lock(&sc->as_lock);
for (i = 0; i < size; i += PAGE_SIZE) {
m = pages[OFF_TO_IDX(i)];
KASSERT(m->wire_count > 0,
("agp_bind_pages: page %p hasn't been wired", m));
/*
* Install entries in the GATT, making sure that if
* AGP_PAGE_SIZE < PAGE_SIZE and size is not
* aligned to PAGE_SIZE, we don't modify too many GATT
* entries.
*/
for (j = 0; j < PAGE_SIZE && i + j < size; j += AGP_PAGE_SIZE) {
pa = VM_PAGE_TO_PHYS(m) + j;
AGP_DPF("binding offset %#jx to pa %#jx\n",
(uintmax_t)offset + i + j, (uintmax_t)pa);
error = AGP_BIND_PAGE(dev, offset + i + j, pa);
if (error) {
/*
* Bail out. Reverse all the mappings.
*/
for (k = 0; k < i + j; k += AGP_PAGE_SIZE)
AGP_UNBIND_PAGE(dev, offset + k);
mtx_unlock(&sc->as_lock);
return (error);
}
}
}
AGP_FLUSH_TLB(dev);
mtx_unlock(&sc->as_lock);
return (0);
}
int
agp_unbind_pages(device_t dev, vm_size_t size, vm_offset_t offset)
{
struct agp_softc *sc;
vm_offset_t i;
if ((size & (AGP_PAGE_SIZE - 1)) != 0 ||
(offset & (AGP_PAGE_SIZE - 1)) != 0)
return (EINVAL);
sc = device_get_softc(dev);
mtx_lock(&sc->as_lock);
for (i = 0; i < size; i += AGP_PAGE_SIZE)
AGP_UNBIND_PAGE(dev, offset + i);
AGP_FLUSH_TLB(dev);
mtx_unlock(&sc->as_lock);
return (0);
}
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