| Age | Commit message (Collapse) | Author |
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asm/desc.h is included in three assembly files, but the only macro
it defines, GET_DESC_BASE, is never used. This patch removes the
includes, removes the macro GET_DESC_BASE and the ASSEMBLY guard
from asm/desc.h.
Signed-off-by: Alexander van Heukelum <heukelum@fastmail.fm>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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The espfix code triggers if we have a protected mode userspace
application with a 16-bit stack. On returning to userspace, with iret,
the CPU doesn't restore the high word of the stack pointer. This is an
"official" bug, and the work-around used in the kernel is to temporarily
switch to a 32-bit stack segment/pointer pair where the high word of the
pointer is equal to the high word of the userspace stackpointer.
The current implementation uses THREAD_SIZE to determine the cut-off,
but there is no good reason not to use the more natural 64kb... However,
implementing this by simply substituting THREAD_SIZE with 65536 in
patch_espfix_desc crashed the test application. patch_espfix_desc tries
to do what is described above, but gets it subtly wrong if the userspace
stack pointer is just below a multiple of THREAD_SIZE: an overflow
occurs to bit 13... With a bit of luck, when the kernelspace
stackpointer is just below a 64kb-boundary, the overflow then ripples
trough to bit 16 and userspace will see its stack pointer changed by
65536.
This patch moves all espfix code into entry_32.S. Selecting a 16-bit
cut-off simplifies the code. The game with changing the limit dynamically
is removed too. It complicates matters and I see no value in it. Changing
only the top 16-bit word of ESP is one instruction and it also implies
that only two bytes of the ESPFIX GDT entry need to be changed and this
can be implemented in just a handful simple to understand instructions.
As a side effect, the operation to compute the original ESP from the
ESPFIX ESP and the GDT entry simplifies a bit too, and the remaining
three instructions have been expanded inline in entry_32.S.
impact: can now reliably run userspace with ESP=xxxxfffc on 16-bit
stack segment
Signed-off-by: Alexander van Heukelum <heukelum@fastmail.fm>
Acked-by: Stas Sergeev <stsp@aknet.ru>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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Returning to a task with a 16-bit stack requires special care: the iret
instruction does not restore the high word of esp in that case. The
espfix code fixes this, but currently is not invoked on NMIs. This means
that a running task gets the upper word of esp clobbered due intervening
NMIs. To reproduce, compile and run the following program with the nmi
watchdog enabled (nmi_watchdog=2 on the command line). Using gdb you can
see that the high bits of esp contain garbage, while the low bits are
still correct.
This patch puts the espfix code back into the NMI code path.
The patch is slightly complicated due to the irqtrace infrastructure not
being NMI-safe. The NMI return path cannot call TRACE_IRQS_IRET.
Otherwise, the tail of the normal iret-code is correct for the nmi code
path too. To be able to share this code-path, the TRACE_IRQS_IRET was
move up a bit. The espfix code exists after the TRACE_IRQS_IRET, but
this code explicitly disables interrupts. This short interrupts-off
section is now not traced anymore. The return-to-kernel path now always
includes the preliminary test to decide if the espfix code should be
called. This is never the case, but doing it this way keeps the patch as
simple as possible and the few extra instructions should not affect
timing in any significant way.
#define _GNU_SOURCE
#include <stdio.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <unistd.h>
#include <sys/syscall.h>
#include <asm/ldt.h>
int modify_ldt(int func, void *ptr, unsigned long bytecount)
{
return syscall(SYS_modify_ldt, func, ptr, bytecount);
}
/* this is assumed to be usable */
#define SEGBASEADDR 0x10000
#define SEGLIMIT 0x20000
/* 16-bit segment */
struct user_desc desc = {
.entry_number = 0,
.base_addr = SEGBASEADDR,
.limit = SEGLIMIT,
.seg_32bit = 0,
.contents = 0, /* ??? */
.read_exec_only = 0,
.limit_in_pages = 0,
.seg_not_present = 0,
.useable = 1
};
int main(void)
{
setvbuf(stdout, NULL, _IONBF, 0);
/* map a 64 kb segment */
char *pointer = mmap((void *)SEGBASEADDR, SEGLIMIT+1,
PROT_EXEC|PROT_READ|PROT_WRITE,
MAP_SHARED|MAP_ANONYMOUS, -1, 0);
if (pointer == NULL) {
printf("could not map space\n");
return 0;
}
/* write ldt, new mode */
int err = modify_ldt(0x11, &desc, sizeof(desc));
if (err) {
printf("error modifying ldt: %i\n", err);
return 0;
}
for (int i=0; i<1000; i++) {
asm volatile (
"pusha\n\t"
"mov %ss, %eax\n\t" /* preserve ss:esp */
"mov %esp, %ebp\n\t"
"push $7\n\t" /* index 0, ldt, user mode */
"push $65536-4096\n\t" /* esp */
"lss (%esp), %esp\n\t" /* switch to new stack */
"push %eax\n\t" /* save old ss:esp on new stack */
"push %ebp\n\t"
"add $17*65536, %esp\n\t" /* set high bits */
"mov %esp, %edx\n\t"
"mov $10000000, %ecx\n\t" /* wait... */
"1: loop 1b\n\t" /* ... a bit */
"cmp %esp, %edx\n\t"
"je 1f\n\t"
"ud2\n\t" /* esp changed inexplicably! */
"1:\n\t"
"sub $17*65536, %esp\n\t" /* restore high bits */
"lss (%esp), %esp\n\t" /* restore old ss:esp */
"popa\n\t");
printf("\rx%ix", i);
}
return 0;
}
Signed-off-by: Alexander van Heukelum <heukelum@fastmail.fm>
Acked-by: Stas Sergeev <stsp@aknet.ru>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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Vegard Nossum reported:
[ 503.576724] ACPI: Preparing to enter system sleep state S5
[ 503.710857] Disabling non-boot CPUs ...
[ 503.716853] Power down.
[ 503.717770] ------------[ cut here ]------------
[ 503.717770] WARNING: at arch/x86/kernel/apic/apic.c:249 native_apic_write_du)
[ 503.717770] Hardware name: OptiPlex GX100
[ 503.717770] Modules linked in:
[ 503.717770] Pid: 2136, comm: halt Not tainted 2.6.30 #443
[ 503.717770] Call Trace:
[ 503.717770] [<c154d327>] ? printk+0x18/0x1a
[ 503.717770] [<c1017358>] ? native_apic_write_dummy+0x38/0x50
[ 503.717770] [<c10360fc>] warn_slowpath_common+0x6c/0xc0
[ 503.717770] [<c1017358>] ? native_apic_write_dummy+0x38/0x50
[ 503.717770] [<c1036165>] warn_slowpath_null+0x15/0x20
[ 503.717770] [<c1017358>] native_apic_write_dummy+0x38/0x50
[ 503.717770] [<c1017173>] disconnect_bsp_APIC+0x63/0x100
[ 503.717770] [<c1019e48>] disable_IO_APIC+0xb8/0xc0
[ 503.717770] [<c1214231>] ? acpi_power_off+0x0/0x29
[ 503.717770] [<c1015e55>] native_machine_shutdown+0x65/0x80
[ 503.717770] [<c1015c36>] native_machine_power_off+0x26/0x30
[ 503.717770] [<c1015c49>] machine_power_off+0x9/0x10
[ 503.717770] [<c1046596>] kernel_power_off+0x36/0x40
[ 503.717770] [<c104680d>] sys_reboot+0xfd/0x1f0
[ 503.717770] [<c109daa0>] ? perf_swcounter_event+0xb0/0x130
[ 503.717770] [<c109db7d>] ? perf_counter_task_sched_out+0x5d/0x120
[ 503.717770] [<c102dfc6>] ? finish_task_switch+0x56/0xd0
[ 503.717770] [<c154da1e>] ? schedule+0x49e/0xb40
[ 503.717770] [<c10444b0>] ? sys_kill+0x70/0x160
[ 503.717770] [<c119d9db>] ? selinux_file_ioctl+0x3b/0x50
[ 503.717770] [<c10dd443>] ? sys_ioctl+0x63/0x70
[ 503.717770] [<c1003024>] sysenter_do_call+0x12/0x22
[ 503.717770] ---[ end trace 8157b5d0ed378f15 ]---
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| That's including this commit:
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| commit 103428e57be323c3c5545db8ad12667099bc6005
|Author: Cyrill Gorcunov <gorcunov@openvz.org>
|Date: Sun Jun 7 16:48:40 2009 +0400
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| x86, apic: Fix dummy apic read operation together with broken MP handling
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If we have apic disabled we don't even switch to APIC mode and do not
calling for connect_bsp_APIC. Though on SMP compiled kernel the
native_machine_shutdown does try to write the apic register anyway.
Fix it with explicit check if we really should touch apic registers.
Reported-by: Vegard Nossum <vegard.nossum@gmail.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Yinghai Lu <yinghai@kernel.org>
LKML-Reference: <20090617181322.GG10822@lenovo>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Signed-off-by: Huang Weiyi <weiyi.huang@gmail.com>
LKML-Reference: <1244895686-2348-1-git-send-email-weiyi.huang@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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<linux/types.h> is only required for __KERNEL__ as whole file is covered with it
Also fixed some spacing issues for usr/include/asm-x86/msr.h
Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com>
Cc: "H. Peter Anvin" <hpa@kernel.org>
LKML-Reference: <1245228070.2662.1.camel@ht.satnam>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Expand Intel NMI perfctr1 workaround to include a Core2 processor stepping
(cpuid family-6, model-f, stepping-4). Resolves a situation where the NMI
would not enable on these processors.
Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Acked-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: prarit@redhat.com
Cc: suresh.b.siddha@intel.com
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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This compiler warning:
arch/x86/kernel/apic/io_apic.c: In function ‘ioapic_write_entry’:
arch/x86/kernel/apic/io_apic.c:466: warning: ‘eu’ is used uninitialized in this function
arch/x86/kernel/apic/io_apic.c:465: note: ‘eu’ was declared here
Is bogus as 'eu' is always initialized. But annotate it away by
initializing the variable, to make it easier for people to notice
real warnings. A compiler that sees through this logic will
optimize away the initialization.
Signed-off-by: Figo.zhang <figo1802@gmail.com>
LKML-Reference: <1245248720.3312.27.camel@myhost>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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If APIC was disabled (for some reason) and as result
it's not even mapped we should not try to enable thermal
interrupts at all.
Reported-by: Simon Holm Thøgersen <odie@cs.aau.dk>
Tested-by: Simon Holm Thøgersen <odie@cs.aau.dk>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
LKML-Reference: <20090615182633.GA7606@lenovo>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Vegard Nossum reported:
> I get an MCE-related crash like this in latest linus tree:
>
> [ 0.115341] CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64 bytes/line)
> [ 0.116396] CPU: L2 Cache: 512K (64 bytes/line)
> [ 0.120570] mce: CPU supports 0 MCE banks
> [ 0.124870] BUG: unable to handle kernel NULL pointer dereference at 00000000 00000010
> [ 0.128001] IP: [<ffffffff813b98ad>] mcheck_init+0x278/0x320
> [ 0.128001] PGD 0
> [ 0.128001] Thread overran stack, or stack corrupted
> [ 0.128001] Oops: 0002 [#1] PREEMPT SMP
> [ 0.128001] last sysfs file:
> [ 0.128001] CPU 0
> [ 0.128001] Modules linked in:
> [ 0.128001] Pid: 0, comm: swapper Not tainted 2.6.30 #426
> [ 0.128001] RIP: 0010:[<ffffffff813b98ad>] [<ffffffff813b98ad>] mcheck_init+0x278/0x320
> [ 0.128001] RSP: 0018:ffffffff81595e38 EFLAGS: 00000246
> [ 0.128001] RAX: 0000000000000010 RBX: ffffffff8158f900 RCX: 0000000000000000
> [ 0.128001] RDX: 0000000000000000 RSI: 00000000000000ff RDI: 0000000000000010
> [ 0.128001] RBP: ffffffff81595e68 R08: 0000000000000001 R09: 0000000000000000
> [ 0.128001] R10: 0000000000000010 R11: 0000000000000000 R12: 0000000000000000
> [ 0.128001] R13: 00000000ffffffff R14: 0000000000000000 R15: 0000000000000000
> [ 0.128001] FS: 0000000000000000(0000) GS:ffff880002288000(0000) knlGS:00000
> 00000000000
> [ 0.128001] CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b
> [ 0.128001] CR2: 0000000000000010 CR3: 0000000001001000 CR4: 00000000000006b0
> [ 0.128001] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [ 0.128001] DR3: 0000000000000000 DR6: 0000000000000000 DR7: 0000000000000000
> [ 0.128001] Process swapper (pid: 0, threadinfo ffffffff81594000, task ffffff
> ff8152a4a0)
> [ 0.128001] Stack:
> [ 0.128001] 0000000081595e68 5aa50ed3b4ddbe6e ffffffff8158f900 ffffffff8158f
> 914
> [ 0.128001] ffffffff8158f948 0000000000000000 ffffffff81595eb8 ffffffff813b8
> 69c
> [ 0.128001] 5aa50ed3b4ddbe6e 00000001078bfbfd 0000062300000800 5aa50ed3b4ddb
> e6e
> [ 0.128001] Call Trace:
> [ 0.128001] [<ffffffff813b869c>] identify_cpu+0x331/0x392
> [ 0.128001] [<ffffffff815a1445>] identify_boot_cpu+0x23/0x6e
> [ 0.128001] [<ffffffff815a14ac>] check_bugs+0x1c/0x60
> [ 0.128001] [<ffffffff8159c075>] start_kernel+0x403/0x46e
> [ 0.128001] [<ffffffff8159b2ac>] x86_64_start_reservations+0xac/0xd5
> [ 0.128001] [<ffffffff8159b3ea>] x86_64_start_kernel+0x115/0x14b
> [ 0.128001] [<ffffffff8159b140>] ? early_idt_handler+0x0/0x71
This happens on QEMU which reports MCA capability, but no banks.
Without this patch there is a buffer overrun and boot ops because
the code would try to initialize the 0 element of a zero length
kmalloc() buffer.
Reported-by: Vegard Nossum <vegard.nossum@gmail.com>
Tested-by: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
LKML-Reference: <20090615125200.GD31969@one.firstfloor.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Merge reason: pull in latest to fix a bug in it.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Use .code16gcc to compile arch/x86/boot/bioscall.S rather than
.code16, since some older versions of binutils can't generate 32-bit
addressing expressions (67 prefixes) in .code16 mode, only in
.code16gcc mode.
Reported-by: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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This patch causes all the EFI_RESERVED_TYPE memory reservations to be recorded
in the e820 table as type E820_RESERVED.
(This patch replaces one called 'x86: vendor reserved memory type'.
This version has been discussed a bit with Peter and Yinghai but not given
a final opinion.)
Without this patch EFI_RESERVED_TYPE memory reservations may be
marked usable in the e820 table. There may be a collision between
kernel use and some reserver's use of this memory.
(An example use of this functionality is the UV system, which
will access extremely large areas of memory with a memory engine
that allows a user to address beyond the processor's range. Such
areas are reserved in the EFI table by the BIOS.
Some loaders have a restricted number of entries possible in the e820 table,
hence the need to record the reservations in the unrestricted EFI table.)
The call to do_add_efi_memmap() is only made if "add_efi_memmap" is specified
on the kernel command line.
Signed-off-by: Cliff Wickman <cpw@sgi.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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iomem_resource is by default initialized to -1, which means 64 bits of
physical address space if 64-bit resources are enabled. However, x86
CPUs cannot address 64 bits of physical address space. Thus, we want
to cap the physical address space to what the union of all CPU can
actually address.
Without this patch, we may end up assigning inaccessible values to
uninitialized 64-bit PCI memory resources.
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Cc: Matthew Wilcox <matthew@wil.cx>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: Martin Mares <mj@ucw.cz>
Cc: stable@kernel.org
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* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-next-2.6: (30 commits)
sparc64: Update defconfig.
sparc: Wire up sys_rt_tgsigqueueinfo().
openprom: Squelch useless GCC warning.
sparc: replace uses of CPU_MASK_ALL_PTR
sparc64: Add proper dynamic ftrace support.
sparc: Simplify code using is_power_of_2() routine.
sparc: move of_device common code to of_device_common
sparc: remove dma-mapping_{32|64}.h
sparc: use dma_map_page instead of dma_map_single
sparc: add sync_single_for_device and sync_sg_for_device to struct dma_ops
sparc: move the duplication in dma-mapping_{32|64}.h to dma-mapping.h
p9100: use standard fields for framebuffer physical address and length
leo: use standard fields for framebuffer physical address and length
cg6: use standard fields for framebuffer physical address and length
cg3: use standard fields for framebuffer physical address and length
cg14: use standard fields for framebuffer physical address and length
bw2: use standard fields for framebuffer physical address and length
sparc64: fix and optimize irq distribution
sparc64: Use new dynamic per-cpu allocator.
sparc64: Only allocate per-cpu areas for possible cpus.
...
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git://git.kernel.org/pub/scm/linux/kernel/git/vapier/blackfin
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/vapier/blackfin: (27 commits)
Blackfin: hook up new rt_tgsigqueueinfo syscall
Blackfin: improve CLKIN_HZ config default
Blackfin: initial support for ftrace grapher
Blackfin: initial support for ftrace
Blackfin: enable support for LOCKDEP
Blackfin: add preliminary support for STACKTRACE
Blackfin: move custom sections into sections.h
Blackfin: punt unused/wrong mutex-dec.h
Blackfin: add support for irqflags
Blackfin: add support for bzip2/lzma compressed kernel images
Blackfin: convert Kconfig style to def_bool
Blackfin: bf548-ezkit: update smsc911x resources
Blackfin: update aedos-ipipe code to upstream 1.10-00
Blackfin: bf537-stamp: update ADP5520 resources
Blackfin: bf518f-ezbrd: fix SPI CS for SPI flash
Blackfin: define SPI IRQ in board resources
Blackfin: do not configure the UART early if on wrong processor
Blackfin: fix deadlock in SMP IPI handler
Blackfin: fix flag storage for irq funcs
Blackfin: push down exception oops checking
...
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* 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6: (33 commits)
[S390] s390: hibernation support for s390
[S390] pm: dcssblk power management callbacks.
[S390] pm: monreader power management callbacks.
[S390] pm: monwriter power management callbacks.
[S390] pm: memory hotplug power management callbacks
[S390] pm: con3270 power management callbacks.
[S390] pm: smsgiucv power management callbacks.
[S390] pm: hvc_iucv power management callbacks
[S390] PM: af_iucv power management callbacks.
[S390] pm: netiucv power management callbacks.
[S390] pm: iucv power management callbacks.
[S390] iucv: establish reboot notifier
[S390] pm: power management support for SCLP drivers.
[S390] pm: tape power management callbacks
[S390] pm: vmlogrdr power management callbacks
[S390] pm: vmur driver power management callbacks
[S390] pm: appldata power management callbacks
[S390] pm: vmwatchdog power management callbacks.
[S390] pm: zfcp driver power management callbacks
[S390] pm: claw driver power management callbacks
...
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git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc
* 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc: (38 commits)
ps3flash: Always read chunks of 256 KiB, and cache them
ps3flash: Cache the last accessed FLASH chunk
ps3: Replace direct file operations by callback
ps3: Switch ps3_os_area_[gs]et_rtc_diff to EXPORT_SYMBOL_GPL()
ps3: Correct debug message in dma_ioc0_map_pages()
drivers/ps3: Add missing annotations
ps3fb: Use ps3_system_bus_[gs]et_drvdata() instead of direct access
ps3flash: Use ps3_system_bus_[gs]et_drvdata() instead of direct access
ps3: shorten ps3_system_bus_[gs]et_driver_data to ps3_system_bus_[gs]et_drvdata
ps3: Use dev_[gs]et_drvdata() instead of direct access for system bus devices
block/ps3: remove driver_data direct access of struct device
ps3vram: Make ps3vram_priv.reports a void *
ps3vram: Remove no longer used ps3vram_priv.ddr_base
ps3vram: Replace mutex by spinlock + bio_list
block: Add bio_list_peek()
powerpc: Use generic atomic64_t implementation on 32-bit processors
lib: Provide generic atomic64_t implementation
powerpc: Add compiler memory barrier to mtmsr macro
powerpc/iseries: Mark signal_vsp_instruction() as maybe unused
powerpc/iseries: Fix unused function warning in iSeries DT code
...
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git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging
* 'i2c-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging:
therm_windtunnel: Convert to a new-style i2c driver
therm_adt746x: Convert to a new-style i2c driver
windfarm: Convert to new-style i2c drivers
therm_pm72: Convert to a new-style i2c driver
i2c-viapro: Add new PCI device ID for VX855
i2c/chips: Move max6875 to drivers/misc/eeprom
i2c: Do not give adapters a default parent
i2c: Do not probe for TV chips on Voodoo3 adapters
i2c: Retry automatically on arbitration loss
i2c: Remove void casts
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Signed-off-by: David S. Miller <davem@davemloft.net>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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CPU_MASK_ALL is the (deprecated) "all bits set" cpumask, defined as so:
#define CPU_MASK_ALL (cpumask_t) { { ... } }
Taking the address of such a temporary is questionable at best,
unfortunately 321a8e9d (cpumask: add CPU_MASK_ALL_PTR macro) added
CPU_MASK_ALL_PTR:
#define CPU_MASK_ALL_PTR (&CPU_MASK_ALL)
Which formalizes this practice. One day gcc could bite us over this
usage (though we seem to have gotten away with it so far).
[Description by Rusty Russell]
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Acked-by: Ingo Molnar <mingo@elte.hu>
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Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca>
Signed-off-by: David S. Miller <davem@davemloft.net>
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This patch moves code common to of_device_32.c and of_device_64.c into
of_device_common.h and of_device_common.c.
The only functional difference is in sparc32 where of_bus_default_map is
used in place of of_bus_sbus_map because they are equivelent.
There is still room for further code consolidation with some minor
refactoring.
Boot tested on sparc32 and compile tested on sparc64.
Signed-off-by: Robert Reif <reif@earthlink.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
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This modifies SPARC32 to use struct dma_map ops. It means that we can
remove dma-mapping_{32|64}.h.
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Tested-by: Robert Reif <reif@earthlink.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
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This patch converts dma_map_single and dma_unmap_single to use
map_page and unmap_page respectively and removes unnecessary
map_single and unmap_single. map_page can be used to implement
map_single but the opposite is impossible. Having only dma_map_page in
struct dma_ops is enough.
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Tested-by: Robert Reif <reif@earthlink.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
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This adds sync_single_for_device() and sync_sg_for_device() to struct
dma_ops in order to unify dma-mpping_{32|64}.h. dma-mpping_32.h needs them though dma-mpping_64.h doesn't.
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Tested-by: Robert Reif <reif@earthlink.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Tested-by: Robert Reif <reif@earthlink.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
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irq_choose_cpu() should compare the affinity mask against cpu_online_map
rather than CPU_MASK_ALL, since irq_select_affinity() sets the interrupt's
affinity mask to cpu_online_map "and" CPU_MASK_ALL (which ends up being
just cpu_online_map). The mask comparison in irq_choose_cpu() will always
fail since the two masks are not the same. So the CPU chosen is the first CPU
in the intersection of cpu_online_map and CPU_MASK_ALL, which is always CPU0.
That means all interrupts are reassigned to CPU0...
Distributing interrupts to CPUs in a linearly increasing round robin fashion
is not optimal for the UltraSPARC T1/T2. Also, the irq_rover in
irq_choose_cpu() causes an interrupt to be assigned to a different
processor each time the interrupt is allocated and released. This may lead
to an unbalanced distribution over time.
A static mapping of interrupts to processors is done to optimize and balance
interrupt distribution. For the T1/T2, interrupts are spread to different
cores first, and then to strands within a core.
The following is some benchmarks showing the effects of interrupt
distribution on a T2. The test was done with iperf using a pair of T5220
boxes, each with a 10GBe NIU (XAUI) connected back to back.
TCP | Stock Linear RR IRQ Optimized IRQ
Streams | 2.6.30-rc5 Distribution Distribution
| GBits/sec GBits/sec GBits/sec
--------+-----------------------------------------
1 0.839 0.862 0.868
8 1.16 4.96 5.88
16 1.15 6.40 8.04
100 1.09 7.28 8.68
Signed-off-by: Hong H. Pham <hong.pham@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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This gets us real close to the generic implementation of
setup_per_cpu_areas() except:
1) We store the per-cpu offset into the trap_block[], whereas
the generic code has it's own static array.
2) We have to initialize the %g5 register to hold the boot cpu's
per-cpu area offset.
3) The OBP/MDESC cpu info scan is performed at the end.
Signed-off-by: David S. Miller <davem@davemloft.net>
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Now that we defer the cpu_data() initializations to the end of per-cpu
setup, we can get rid of this local hack we had to setup the per-cpu
areas eary.
This is a necessary step in order to support HAVE_DYNAMIC_PER_CPU_AREA
since the per-cpu setup must run when page structs are available.
Signed-off-by: David S. Miller <davem@davemloft.net>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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We need to split up the cpu present mask setup from the cpu_data
initialization, and this is a first step towards that.
Signed-off-by: David S. Miller <davem@davemloft.net>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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With feedback from Sam Ravnborg.
Signed-off-by: David S. Miller <davem@davemloft.net>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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Surprisingly this actually makes LOAD_PER_CPU_BASE() a little
more efficient.
Signed-off-by: David S. Miller <davem@davemloft.net>
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Later we're going to want to get at these definitions from
asm/percpu.h and that's not possible via cpudata.h because
of the set of dependencies the non-trap_block[] stuff has.
Signed-off-by: David S. Miller <davem@davemloft.net>
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This really isn't necessary at all, a local variable suits the
job just fine.
This frees up 8 bytes in the trap_block[] that we can use later
to store the per-cpu base addresses.
Signed-off-by: David S. Miller <davem@davemloft.net>
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git://git.kernel.org/pub/scm/linux/kernel/git/joro/linux-2.6-iommu into x86/urgent
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This patch introduces the hibernation backend support to the
s390 architecture. Now it is possible to suspend a mainframe Linux
guest using the following command:
echo disk > /sys/power/state
Signed-off-by: Hans-Joachim Picht <hans@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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If something goes wrong in a suspend / resume cycle a ccw based console
if very likely in the suspended state and cannot print anything.
Introduce ccw_device_force_console to force the wake up of the console
device to be able to print the oops message. The console device drivers
should use this function only if the system paniced.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Fix the following build failure caused by make allyesconfig using
CONFIG_HIBERNATION and CONFIG_DEBUG_PAGEALLOC
kernel/built-in.o: In function `saveable_page':
kernel/power/snapshot.c:897: undefined reference to `kernel_page_present'
kernel/built-in.o: In function `safe_copy_page':
kernel/power/snapshot.c:948: undefined reference to `kernel_page_present'
make: *** [.tmp_vmlinux1] Error 1
Signed-off-by: Hans-Joachim Picht <hans@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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