forked from Minki/linux
x86: clean up arch/x86/kernel/aperture_64.c
whitespace cleanup. No code changed:
text data bss dec hex filename
2080 76 4 2160 870 aperture_64.o.before
2080 76 4 2160 870 aperture_64.o.after
errors lines of code errors/KLOC
arch/x86/kernel/aperture_64.c 114 299 381.2
arch/x86/kernel/aperture_64.c 0 315 0
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Ingo Molnar
parent
5bafb671e2
commit
c140df973c
@ -1,12 +1,12 @@
|
||||
/*
|
||||
/*
|
||||
* Firmware replacement code.
|
||||
*
|
||||
*
|
||||
* Work around broken BIOSes that don't set an aperture or only set the
|
||||
* aperture in the AGP bridge.
|
||||
* If all fails map the aperture over some low memory. This is cheaper than
|
||||
* doing bounce buffering. The memory is lost. This is done at early boot
|
||||
* because only the bootmem allocator can allocate 32+MB.
|
||||
*
|
||||
* aperture in the AGP bridge.
|
||||
* If all fails map the aperture over some low memory. This is cheaper than
|
||||
* doing bounce buffering. The memory is lost. This is done at early boot
|
||||
* because only the bootmem allocator can allocate 32+MB.
|
||||
*
|
||||
* Copyright 2002 Andi Kleen, SuSE Labs.
|
||||
*/
|
||||
#include <linux/kernel.h>
|
||||
@ -30,7 +30,7 @@ int gart_iommu_aperture_disabled __initdata = 0;
|
||||
int gart_iommu_aperture_allowed __initdata = 0;
|
||||
|
||||
int fallback_aper_order __initdata = 1; /* 64MB */
|
||||
int fallback_aper_force __initdata = 0;
|
||||
int fallback_aper_force __initdata = 0;
|
||||
|
||||
int fix_aperture __initdata = 1;
|
||||
|
||||
@ -49,20 +49,20 @@ static void __init insert_aperture_resource(u32 aper_base, u32 aper_size)
|
||||
/* This code runs before the PCI subsystem is initialized, so just
|
||||
access the northbridge directly. */
|
||||
|
||||
static u32 __init allocate_aperture(void)
|
||||
static u32 __init allocate_aperture(void)
|
||||
{
|
||||
u32 aper_size;
|
||||
void *p;
|
||||
void *p;
|
||||
|
||||
if (fallback_aper_order > 7)
|
||||
fallback_aper_order = 7;
|
||||
aper_size = (32 * 1024 * 1024) << fallback_aper_order;
|
||||
if (fallback_aper_order > 7)
|
||||
fallback_aper_order = 7;
|
||||
aper_size = (32 * 1024 * 1024) << fallback_aper_order;
|
||||
|
||||
/*
|
||||
* Aperture has to be naturally aligned. This means an 2GB aperture won't
|
||||
* have much chance of finding a place in the lower 4GB of memory.
|
||||
* Unfortunately we cannot move it up because that would make the
|
||||
* IOMMU useless.
|
||||
/*
|
||||
* Aperture has to be naturally aligned. This means a 2GB aperture
|
||||
* won't have much chance of finding a place in the lower 4GB of
|
||||
* memory. Unfortunately we cannot move it up because that would
|
||||
* make the IOMMU useless.
|
||||
*/
|
||||
p = __alloc_bootmem_nopanic(aper_size, aper_size, 0);
|
||||
if (!p || __pa(p)+aper_size > 0xffffffff) {
|
||||
@ -73,54 +73,60 @@ static u32 __init allocate_aperture(void)
|
||||
return 0;
|
||||
}
|
||||
printk("Mapping aperture over %d KB of RAM @ %lx\n",
|
||||
aper_size >> 10, __pa(p));
|
||||
aper_size >> 10, __pa(p));
|
||||
insert_aperture_resource((u32)__pa(p), aper_size);
|
||||
return (u32)__pa(p);
|
||||
|
||||
return (u32)__pa(p);
|
||||
}
|
||||
|
||||
static int __init aperture_valid(u64 aper_base, u32 aper_size)
|
||||
{
|
||||
if (!aper_base)
|
||||
{
|
||||
if (!aper_base)
|
||||
return 0;
|
||||
if (aper_size < 64*1024*1024) {
|
||||
if (aper_size < 64*1024*1024) {
|
||||
printk("Aperture too small (%d MB)\n", aper_size>>20);
|
||||
return 0;
|
||||
}
|
||||
if (aper_base + aper_size > 0x100000000UL) {
|
||||
printk("Aperture beyond 4GB. Ignoring.\n");
|
||||
return 0;
|
||||
return 0;
|
||||
}
|
||||
if (e820_any_mapped(aper_base, aper_base + aper_size, E820_RAM)) {
|
||||
printk("Aperture pointing to e820 RAM. Ignoring.\n");
|
||||
return 0;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
|
||||
/* Find a PCI capability */
|
||||
static __u32 __init find_cap(int num, int slot, int func, int cap)
|
||||
{
|
||||
u8 pos;
|
||||
static __u32 __init find_cap(int num, int slot, int func, int cap)
|
||||
{
|
||||
int bytes;
|
||||
if (!(read_pci_config_16(num,slot,func,PCI_STATUS) & PCI_STATUS_CAP_LIST))
|
||||
u8 pos;
|
||||
|
||||
if (!(read_pci_config_16(num, slot, func, PCI_STATUS) &
|
||||
PCI_STATUS_CAP_LIST))
|
||||
return 0;
|
||||
pos = read_pci_config_byte(num,slot,func,PCI_CAPABILITY_LIST);
|
||||
for (bytes = 0; bytes < 48 && pos >= 0x40; bytes++) {
|
||||
|
||||
pos = read_pci_config_byte(num, slot, func, PCI_CAPABILITY_LIST);
|
||||
for (bytes = 0; bytes < 48 && pos >= 0x40; bytes++) {
|
||||
u8 id;
|
||||
pos &= ~3;
|
||||
id = read_pci_config_byte(num,slot,func,pos+PCI_CAP_LIST_ID);
|
||||
|
||||
pos &= ~3;
|
||||
id = read_pci_config_byte(num, slot, func, pos+PCI_CAP_LIST_ID);
|
||||
if (id == 0xff)
|
||||
break;
|
||||
if (id == cap)
|
||||
return pos;
|
||||
pos = read_pci_config_byte(num,slot,func,pos+PCI_CAP_LIST_NEXT);
|
||||
}
|
||||
if (id == cap)
|
||||
return pos;
|
||||
pos = read_pci_config_byte(num, slot, func,
|
||||
pos+PCI_CAP_LIST_NEXT);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
|
||||
/* Read a standard AGPv3 bridge header */
|
||||
static __u32 __init read_agp(int num, int slot, int func, int cap, u32 *order)
|
||||
{
|
||||
{
|
||||
u32 apsize;
|
||||
u32 apsizereg;
|
||||
int nbits;
|
||||
@ -128,7 +134,7 @@ static __u32 __init read_agp(int num, int slot, int func, int cap, u32 *order)
|
||||
u64 aper;
|
||||
|
||||
printk("AGP bridge at %02x:%02x:%02x\n", num, slot, func);
|
||||
apsizereg = read_pci_config_16(num,slot,func, cap + 0x14);
|
||||
apsizereg = read_pci_config_16(num, slot, func, cap + 0x14);
|
||||
if (apsizereg == 0xffffffff) {
|
||||
printk("APSIZE in AGP bridge unreadable\n");
|
||||
return 0;
|
||||
@ -136,80 +142,84 @@ static __u32 __init read_agp(int num, int slot, int func, int cap, u32 *order)
|
||||
|
||||
apsize = apsizereg & 0xfff;
|
||||
/* Some BIOS use weird encodings not in the AGPv3 table. */
|
||||
if (apsize & 0xff)
|
||||
apsize |= 0xf00;
|
||||
if (apsize & 0xff)
|
||||
apsize |= 0xf00;
|
||||
nbits = hweight16(apsize);
|
||||
*order = 7 - nbits;
|
||||
if ((int)*order < 0) /* < 32MB */
|
||||
*order = 0;
|
||||
|
||||
aper_low = read_pci_config(num,slot,func, 0x10);
|
||||
aper_hi = read_pci_config(num,slot,func,0x14);
|
||||
|
||||
aper_low = read_pci_config(num, slot, func, 0x10);
|
||||
aper_hi = read_pci_config(num, slot, func, 0x14);
|
||||
aper = (aper_low & ~((1<<22)-1)) | ((u64)aper_hi << 32);
|
||||
|
||||
printk("Aperture from AGP @ %Lx size %u MB (APSIZE %x)\n",
|
||||
printk("Aperture from AGP @ %Lx size %u MB (APSIZE %x)\n",
|
||||
aper, 32 << *order, apsizereg);
|
||||
|
||||
if (!aperture_valid(aper, (32*1024*1024) << *order))
|
||||
return 0;
|
||||
return (u32)aper;
|
||||
}
|
||||
return 0;
|
||||
return (u32)aper;
|
||||
}
|
||||
|
||||
/* Look for an AGP bridge. Windows only expects the aperture in the
|
||||
AGP bridge and some BIOS forget to initialize the Northbridge too.
|
||||
Work around this here.
|
||||
|
||||
Do an PCI bus scan by hand because we're running before the PCI
|
||||
subsystem.
|
||||
|
||||
All K8 AGP bridges are AGPv3 compliant, so we can do this scan
|
||||
generically. It's probably overkill to always scan all slots because
|
||||
the AGP bridges should be always an own bus on the HT hierarchy,
|
||||
but do it here for future safety. */
|
||||
/*
|
||||
* Look for an AGP bridge. Windows only expects the aperture in the
|
||||
* AGP bridge and some BIOS forget to initialize the Northbridge too.
|
||||
* Work around this here.
|
||||
*
|
||||
* Do an PCI bus scan by hand because we're running before the PCI
|
||||
* subsystem.
|
||||
*
|
||||
* All K8 AGP bridges are AGPv3 compliant, so we can do this scan
|
||||
* generically. It's probably overkill to always scan all slots because
|
||||
* the AGP bridges should be always an own bus on the HT hierarchy,
|
||||
* but do it here for future safety.
|
||||
*/
|
||||
static __u32 __init search_agp_bridge(u32 *order, int *valid_agp)
|
||||
{
|
||||
int num, slot, func;
|
||||
|
||||
/* Poor man's PCI discovery */
|
||||
for (num = 0; num < 256; num++) {
|
||||
for (slot = 0; slot < 32; slot++) {
|
||||
for (func = 0; func < 8; func++) {
|
||||
for (num = 0; num < 256; num++) {
|
||||
for (slot = 0; slot < 32; slot++) {
|
||||
for (func = 0; func < 8; func++) {
|
||||
u32 class, cap;
|
||||
u8 type;
|
||||
class = read_pci_config(num,slot,func,
|
||||
class = read_pci_config(num, slot, func,
|
||||
PCI_CLASS_REVISION);
|
||||
if (class == 0xffffffff)
|
||||
break;
|
||||
|
||||
switch (class >> 16) {
|
||||
break;
|
||||
|
||||
switch (class >> 16) {
|
||||
case PCI_CLASS_BRIDGE_HOST:
|
||||
case PCI_CLASS_BRIDGE_OTHER: /* needed? */
|
||||
/* AGP bridge? */
|
||||
cap = find_cap(num,slot,func,PCI_CAP_ID_AGP);
|
||||
cap = find_cap(num, slot, func,
|
||||
PCI_CAP_ID_AGP);
|
||||
if (!cap)
|
||||
break;
|
||||
*valid_agp = 1;
|
||||
return read_agp(num,slot,func,cap,order);
|
||||
}
|
||||
|
||||
*valid_agp = 1;
|
||||
return read_agp(num, slot, func, cap,
|
||||
order);
|
||||
}
|
||||
|
||||
/* No multi-function device? */
|
||||
type = read_pci_config_byte(num,slot,func,
|
||||
type = read_pci_config_byte(num, slot, func,
|
||||
PCI_HEADER_TYPE);
|
||||
if (!(type & 0x80))
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
printk("No AGP bridge found\n");
|
||||
printk("No AGP bridge found\n");
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
void __init gart_iommu_hole_init(void)
|
||||
{
|
||||
int fix, num;
|
||||
{
|
||||
u32 aper_size, aper_alloc = 0, aper_order = 0, last_aper_order = 0;
|
||||
u64 aper_base, last_aper_base = 0;
|
||||
int valid_agp = 0;
|
||||
int fix, num, valid_agp = 0;
|
||||
|
||||
if (gart_iommu_aperture_disabled || !fix_aperture ||
|
||||
!early_pci_allowed())
|
||||
@ -218,24 +228,24 @@ void __init gart_iommu_hole_init(void)
|
||||
printk(KERN_INFO "Checking aperture...\n");
|
||||
|
||||
fix = 0;
|
||||
for (num = 24; num < 32; num++) {
|
||||
for (num = 24; num < 32; num++) {
|
||||
if (!early_is_k8_nb(read_pci_config(0, num, 3, 0x00)))
|
||||
continue;
|
||||
|
||||
iommu_detected = 1;
|
||||
gart_iommu_aperture = 1;
|
||||
|
||||
aper_order = (read_pci_config(0, num, 3, 0x90) >> 1) & 7;
|
||||
aper_size = (32 * 1024 * 1024) << aper_order;
|
||||
aper_order = (read_pci_config(0, num, 3, 0x90) >> 1) & 7;
|
||||
aper_size = (32 * 1024 * 1024) << aper_order;
|
||||
aper_base = read_pci_config(0, num, 3, 0x94) & 0x7fff;
|
||||
aper_base <<= 25;
|
||||
aper_base <<= 25;
|
||||
|
||||
printk("CPU %d: aperture @ %Lx size %u MB\n", num-24,
|
||||
printk("CPU %d: aperture @ %Lx size %u MB\n", num-24,
|
||||
aper_base, aper_size>>20);
|
||||
|
||||
|
||||
if (!aperture_valid(aper_base, aper_size)) {
|
||||
fix = 1;
|
||||
break;
|
||||
fix = 1;
|
||||
break;
|
||||
}
|
||||
|
||||
if ((last_aper_order && aper_order != last_aper_order) ||
|
||||
@ -245,27 +255,28 @@ void __init gart_iommu_hole_init(void)
|
||||
}
|
||||
last_aper_order = aper_order;
|
||||
last_aper_base = aper_base;
|
||||
}
|
||||
}
|
||||
|
||||
if (!fix && !fallback_aper_force) {
|
||||
if (last_aper_base) {
|
||||
unsigned long n = (32 * 1024 * 1024) << last_aper_order;
|
||||
|
||||
insert_aperture_resource((u32)last_aper_base, n);
|
||||
}
|
||||
return;
|
||||
return;
|
||||
}
|
||||
|
||||
if (!fallback_aper_force)
|
||||
aper_alloc = search_agp_bridge(&aper_order, &valid_agp);
|
||||
|
||||
if (aper_alloc) {
|
||||
aper_alloc = search_agp_bridge(&aper_order, &valid_agp);
|
||||
|
||||
if (aper_alloc) {
|
||||
/* Got the aperture from the AGP bridge */
|
||||
} else if (swiotlb && !valid_agp) {
|
||||
/* Do nothing */
|
||||
} else if ((!no_iommu && end_pfn > MAX_DMA32_PFN) ||
|
||||
force_iommu ||
|
||||
valid_agp ||
|
||||
fallback_aper_force) {
|
||||
fallback_aper_force) {
|
||||
printk("Your BIOS doesn't leave a aperture memory hole\n");
|
||||
printk("Please enable the IOMMU option in the BIOS setup\n");
|
||||
printk("This costs you %d MB of RAM\n",
|
||||
@ -273,27 +284,32 @@ void __init gart_iommu_hole_init(void)
|
||||
|
||||
aper_order = fallback_aper_order;
|
||||
aper_alloc = allocate_aperture();
|
||||
if (!aper_alloc) {
|
||||
/* Could disable AGP and IOMMU here, but it's probably
|
||||
not worth it. But the later users cannot deal with
|
||||
bad apertures and turning on the aperture over memory
|
||||
causes very strange problems, so it's better to
|
||||
panic early. */
|
||||
if (!aper_alloc) {
|
||||
/*
|
||||
* Could disable AGP and IOMMU here, but it's
|
||||
* probably not worth it. But the later users
|
||||
* cannot deal with bad apertures and turning
|
||||
* on the aperture over memory causes very
|
||||
* strange problems, so it's better to panic
|
||||
* early.
|
||||
*/
|
||||
panic("Not enough memory for aperture");
|
||||
}
|
||||
} else {
|
||||
return;
|
||||
}
|
||||
} else {
|
||||
return;
|
||||
}
|
||||
|
||||
/* Fix up the north bridges */
|
||||
for (num = 24; num < 32; num++) {
|
||||
for (num = 24; num < 32; num++) {
|
||||
if (!early_is_k8_nb(read_pci_config(0, num, 3, 0x00)))
|
||||
continue;
|
||||
continue;
|
||||
|
||||
/* Don't enable translation yet. That is done later.
|
||||
Assume this BIOS didn't initialise the GART so
|
||||
just overwrite all previous bits */
|
||||
write_pci_config(0, num, 3, 0x90, aper_order<<1);
|
||||
write_pci_config(0, num, 3, 0x94, aper_alloc>>25);
|
||||
}
|
||||
}
|
||||
/*
|
||||
* Don't enable translation yet. That is done later.
|
||||
* Assume this BIOS didn't initialise the GART so
|
||||
* just overwrite all previous bits
|
||||
*/
|
||||
write_pci_config(0, num, 3, 0x90, aper_order<<1);
|
||||
write_pci_config(0, num, 3, 0x94, aper_alloc>>25);
|
||||
}
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user