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kernel_optimize_test/arch/alpha/kernel/smp.c
Greg Kroah-Hartman b24413180f License cleanup: add SPDX GPL-2.0 license identifier to files with no license 
Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.

By default all files without license information are under the default
license of the kernel, which is GPL version 2.

Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier.  The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.

This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.

How this work was done:

Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
 - file had no licensing information it it.
 - file was a */uapi/* one with no licensing information in it,
 - file was a */uapi/* one with existing licensing information,

Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.

The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne.  Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.

The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed.  Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.

Criteria used to select files for SPDX license identifier tagging was:
 - Files considered eligible had to be source code files.
 - Make and config files were included as candidates if they contained >5
   lines of source
 - File already had some variant of a license header in it (even if <5
   lines).

All documentation files were explicitly excluded.

The following heuristics were used to determine which SPDX license
identifiers to apply.

 - when both scanners couldn't find any license traces, file was
   considered to have no license information in it, and the top level
   COPYING file license applied.

   For non */uapi/* files that summary was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0                                              11139

   and resulted in the first patch in this series.

   If that file was a */uapi/* path one, it was "GPL-2.0 WITH
   Linux-syscall-note" otherwise it was "GPL-2.0".  Results of that was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0 WITH Linux-syscall-note                        930

   and resulted in the second patch in this series.

 - if a file had some form of licensing information in it, and was one
   of the */uapi/* ones, it was denoted with the Linux-syscall-note if
   any GPL family license was found in the file or had no licensing in
   it (per prior point).  Results summary:

   SPDX license identifier                            # files
   ---------------------------------------------------|------
   GPL-2.0 WITH Linux-syscall-note                       270
   GPL-2.0+ WITH Linux-syscall-note                      169
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause)    21
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)    17
   LGPL-2.1+ WITH Linux-syscall-note                      15
   GPL-1.0+ WITH Linux-syscall-note                       14
   ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause)    5
   LGPL-2.0+ WITH Linux-syscall-note                       4
   LGPL-2.1 WITH Linux-syscall-note                        3
   ((GPL-2.0 WITH Linux-syscall-note) OR MIT)              3
   ((GPL-2.0 WITH Linux-syscall-note) AND MIT)             1

   and that resulted in the third patch in this series.

 - when the two scanners agreed on the detected license(s), that became
   the concluded license(s).

 - when there was disagreement between the two scanners (one detected a
   license but the other didn't, or they both detected different
   licenses) a manual inspection of the file occurred.

 - In most cases a manual inspection of the information in the file
   resulted in a clear resolution of the license that should apply (and
   which scanner probably needed to revisit its heuristics).

 - When it was not immediately clear, the license identifier was
   confirmed with lawyers working with the Linux Foundation.

 - If there was any question as to the appropriate license identifier,
   the file was flagged for further research and to be revisited later
   in time.

In total, over 70 hours of logged manual review was done on the
spreadsheet to determine the SPDX license identifiers to apply to the
source files by Kate, Philippe, Thomas and, in some cases, confirmation
by lawyers working with the Linux Foundation.

Kate also obtained a third independent scan of the 4.13 code base from
FOSSology, and compared selected files where the other two scanners
disagreed against that SPDX file, to see if there was new insights.  The
Windriver scanner is based on an older version of FOSSology in part, so
they are related.

Thomas did random spot checks in about 500 files from the spreadsheets
for the uapi headers and agreed with SPDX license identifier in the
files he inspected. For the non-uapi files Thomas did random spot checks
in about 15000 files.

In initial set of patches against 4.14-rc6, 3 files were found to have
copy/paste license identifier errors, and have been fixed to reflect the
correct identifier.

Additionally Philippe spent 10 hours this week doing a detailed manual
inspection and review of the 12,461 patched files from the initial patch
version early this week with:
 - a full scancode scan run, collecting the matched texts, detected
   license ids and scores
 - reviewing anything where there was a license detected (about 500+
   files) to ensure that the applied SPDX license was correct
 - reviewing anything where there was no detection but the patch license
   was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
   SPDX license was correct

This produced a worksheet with 20 files needing minor correction.  This
worksheet was then exported into 3 different .csv files for the
different types of files to be modified.

These .csv files were then reviewed by Greg.  Thomas wrote a script to
parse the csv files and add the proper SPDX tag to the file, in the
format that the file expected.  This script was further refined by Greg
based on the output to detect more types of files automatically and to
distinguish between header and source .c files (which need different
comment types.)  Finally Greg ran the script using the .csv files to
generate the patches.

Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-02 11:10:55 +01:00

781 lines
17 KiB
C
Raw Blame History

// SPDX-License-Identifier: GPL-2.0
/*
* linux/arch/alpha/kernel/smp.c
*
* 2001-07-09 Phil Ezolt (Phillip.Ezolt@compaq.com)
* Renamed modified smp_call_function to smp_call_function_on_cpu()
* Created an function that conforms to the old calling convention
* of smp_call_function().
*
* This is helpful for DCPI.
*
*/
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/kernel_stat.h>
#include <linux/module.h>
#include <linux/sched/mm.h>
#include <linux/mm.h>
#include <linux/err.h>
#include <linux/threads.h>
#include <linux/smp.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/spinlock.h>
#include <linux/irq.h>
#include <linux/cache.h>
#include <linux/profile.h>
#include <linux/bitops.h>
#include <linux/cpu.h>
#include <asm/hwrpb.h>
#include <asm/ptrace.h>
#include <linux/atomic.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/mmu_context.h>
#include <asm/tlbflush.h>
#include "proto.h"
#include "irq_impl.h"
#define DEBUG_SMP 0
#if DEBUG_SMP
#define DBGS(args) printk args
#else
#define DBGS(args)
#endif
/* A collection of per-processor data. */
struct cpuinfo_alpha cpu_data[NR_CPUS];
EXPORT_SYMBOL(cpu_data);
/* A collection of single bit ipi messages. */
static struct {
unsigned long bits ____cacheline_aligned;
} ipi_data[NR_CPUS] __cacheline_aligned;
enum ipi_message_type {
IPI_RESCHEDULE,
IPI_CALL_FUNC,
IPI_CPU_STOP,
};
/* Set to a secondary's cpuid when it comes online. */
static int smp_secondary_alive = 0;
int smp_num_probed; /* Internal processor count */
int smp_num_cpus = 1; /* Number that came online. */
EXPORT_SYMBOL(smp_num_cpus);
/*
* Called by both boot and secondaries to move global data into
* per-processor storage.
*/
static inline void __init
smp_store_cpu_info(int cpuid)
{
cpu_data[cpuid].loops_per_jiffy = loops_per_jiffy;
cpu_data[cpuid].last_asn = ASN_FIRST_VERSION;
cpu_data[cpuid].need_new_asn = 0;
cpu_data[cpuid].asn_lock = 0;
}
/*
* Ideally sets up per-cpu profiling hooks. Doesn't do much now...
*/
static inline void __init
smp_setup_percpu_timer(int cpuid)
{
cpu_data[cpuid].prof_counter = 1;
cpu_data[cpuid].prof_multiplier = 1;
}
static void __init
wait_boot_cpu_to_stop(int cpuid)
{
unsigned long stop = jiffies + 10*HZ;
while (time_before(jiffies, stop)) {
if (!smp_secondary_alive)
return;
barrier();
}
printk("wait_boot_cpu_to_stop: FAILED on CPU %d, hanging now\n", cpuid);
for (;;)
barrier();
}
/*
* Where secondaries begin a life of C.
*/
void __init
smp_callin(void)
{
int cpuid = hard_smp_processor_id();
if (cpu_online(cpuid)) {
printk("??, cpu 0x%x already present??\n", cpuid);
BUG();
}
set_cpu_online(cpuid, true);
/* Turn on machine checks. */
wrmces(7);
/* Set trap vectors. */
trap_init();
/* Set interrupt vector. */
wrent(entInt, 0);
/* Get our local ticker going. */
smp_setup_percpu_timer(cpuid);
init_clockevent();
/* Call platform-specific callin, if specified */
if (alpha_mv.smp_callin)
alpha_mv.smp_callin();
/* All kernel threads share the same mm context. */
mmgrab(&init_mm);
current->active_mm = &init_mm;
/* inform the notifiers about the new cpu */
notify_cpu_starting(cpuid);
/* Must have completely accurate bogos. */
local_irq_enable();
/* Wait boot CPU to stop with irq enabled before running
calibrate_delay. */
wait_boot_cpu_to_stop(cpuid);
mb();
calibrate_delay();
smp_store_cpu_info(cpuid);
/* Allow master to continue only after we written loops_per_jiffy. */
wmb();
smp_secondary_alive = 1;
DBGS(("smp_callin: commencing CPU %d current %p active_mm %p\n",
cpuid, current, current->active_mm));
preempt_disable();
cpu_startup_entry(CPUHP_AP_ONLINE_IDLE);
}
/* Wait until hwrpb->txrdy is clear for cpu. Return -1 on timeout. */
static int
wait_for_txrdy (unsigned long cpumask)
{
unsigned long timeout;
if (!(hwrpb->txrdy & cpumask))
return 0;
timeout = jiffies + 10*HZ;
while (time_before(jiffies, timeout)) {
if (!(hwrpb->txrdy & cpumask))
return 0;
udelay(10);
barrier();
}
return -1;
}
/*
* Send a message to a secondary's console. "START" is one such
* interesting message. ;-)
*/
static void
send_secondary_console_msg(char *str, int cpuid)
{
struct percpu_struct *cpu;
register char *cp1, *cp2;
unsigned long cpumask;
size_t len;
cpu = (struct percpu_struct *)
((char*)hwrpb
+ hwrpb->processor_offset
+ cpuid * hwrpb->processor_size);
cpumask = (1UL << cpuid);
if (wait_for_txrdy(cpumask))
goto timeout;
cp2 = str;
len = strlen(cp2);
*(unsigned int *)&cpu->ipc_buffer[0] = len;
cp1 = (char *) &cpu->ipc_buffer[1];
memcpy(cp1, cp2, len);
/* atomic test and set */
wmb();
set_bit(cpuid, &hwrpb->rxrdy);
if (wait_for_txrdy(cpumask))
goto timeout;
return;
timeout:
printk("Processor %x not ready\n", cpuid);
}
/*
* A secondary console wants to send a message. Receive it.
*/
static void
recv_secondary_console_msg(void)
{
int mycpu, i, cnt;
unsigned long txrdy = hwrpb->txrdy;
char *cp1, *cp2, buf[80];
struct percpu_struct *cpu;
DBGS(("recv_secondary_console_msg: TXRDY 0x%lx.\n", txrdy));
mycpu = hard_smp_processor_id();
for (i = 0; i < NR_CPUS; i++) {
if (!(txrdy & (1UL << i)))
continue;
DBGS(("recv_secondary_console_msg: "
"TXRDY contains CPU %d.\n", i));
cpu = (struct percpu_struct *)
((char*)hwrpb
+ hwrpb->processor_offset
+ i * hwrpb->processor_size);
DBGS(("recv_secondary_console_msg: on %d from %d"
" HALT_REASON 0x%lx FLAGS 0x%lx\n",
mycpu, i, cpu->halt_reason, cpu->flags));
cnt = cpu->ipc_buffer[0] >> 32;
if (cnt <= 0 || cnt >= 80)
strcpy(buf, "<<< BOGUS MSG >>>");
else {
cp1 = (char *) &cpu->ipc_buffer[1];
cp2 = buf;
memcpy(cp2, cp1, cnt);
cp2[cnt] = '\0';
while ((cp2 = strchr(cp2, '\r')) != 0) {
*cp2 = ' ';
if (cp2[1] == '\n')
cp2[1] = ' ';
}
}
DBGS((KERN_INFO "recv_secondary_console_msg: on %d "
"message is '%s'\n", mycpu, buf));
}
hwrpb->txrdy = 0;
}
/*
* Convince the console to have a secondary cpu begin execution.
*/
static int
secondary_cpu_start(int cpuid, struct task_struct *idle)
{
struct percpu_struct *cpu;
struct pcb_struct *hwpcb, *ipcb;
unsigned long timeout;
cpu = (struct percpu_struct *)
((char*)hwrpb
+ hwrpb->processor_offset
+ cpuid * hwrpb->processor_size);
hwpcb = (struct pcb_struct *) cpu->hwpcb;
ipcb = &task_thread_info(idle)->pcb;
/* Initialize the CPU's HWPCB to something just good enough for
us to get started. Immediately after starting, we'll swpctx
to the target idle task's pcb. Reuse the stack in the mean
time. Precalculate the target PCBB. */
hwpcb->ksp = (unsigned long)ipcb + sizeof(union thread_union) - 16;
hwpcb->usp = 0;
hwpcb->ptbr = ipcb->ptbr;
hwpcb->pcc = 0;
hwpcb->asn = 0;
hwpcb->unique = virt_to_phys(ipcb);
hwpcb->flags = ipcb->flags;
hwpcb->res1 = hwpcb->res2 = 0;
#if 0
DBGS(("KSP 0x%lx PTBR 0x%lx VPTBR 0x%lx UNIQUE 0x%lx\n",
hwpcb->ksp, hwpcb->ptbr, hwrpb->vptb, hwpcb->unique));
#endif
DBGS(("Starting secondary cpu %d: state 0x%lx pal_flags 0x%lx\n",
cpuid, idle->state, ipcb->flags));
/* Setup HWRPB fields that SRM uses to activate secondary CPU */
hwrpb->CPU_restart = __smp_callin;
hwrpb->CPU_restart_data = (unsigned long) __smp_callin;
/* Recalculate and update the HWRPB checksum */
hwrpb_update_checksum(hwrpb);
/*
* Send a "start" command to the specified processor.
*/
/* SRM III 3.4.1.3 */
cpu->flags |= 0x22; /* turn on Context Valid and Restart Capable */
cpu->flags &= ~1; /* turn off Bootstrap In Progress */
wmb();
send_secondary_console_msg("START\r\n", cpuid);
/* Wait 10 seconds for an ACK from the console. */
timeout = jiffies + 10*HZ;
while (time_before(jiffies, timeout)) {
if (cpu->flags & 1)
goto started;
udelay(10);
barrier();
}
printk(KERN_ERR "SMP: Processor %d failed to start.\n", cpuid);
return -1;
started:
DBGS(("secondary_cpu_start: SUCCESS for CPU %d!!!\n", cpuid));
return 0;
}
/*
* Bring one cpu online.
*/
static int
smp_boot_one_cpu(int cpuid, struct task_struct *idle)
{
unsigned long timeout;
/* Signal the secondary to wait a moment. */
smp_secondary_alive = -1;
/* Whirrr, whirrr, whirrrrrrrrr... */
if (secondary_cpu_start(cpuid, idle))
return -1;
/* Notify the secondary CPU it can run calibrate_delay. */
mb();
smp_secondary_alive = 0;
/* We've been acked by the console; wait one second for
the task to start up for real. */
timeout = jiffies + 1*HZ;
while (time_before(jiffies, timeout)) {
if (smp_secondary_alive == 1)
goto alive;
udelay(10);
barrier();
}
/* We failed to boot the CPU. */
printk(KERN_ERR "SMP: Processor %d is stuck.\n", cpuid);
return -1;
alive:
/* Another "Red Snapper". */
return 0;
}
/*
* Called from setup_arch. Detect an SMP system and which processors
* are present.
*/
void __init
setup_smp(void)
{
struct percpu_struct *cpubase, *cpu;
unsigned long i;
if (boot_cpuid != 0) {
printk(KERN_WARNING "SMP: Booting off cpu %d instead of 0?\n",
boot_cpuid);
}
if (hwrpb->nr_processors > 1) {
int boot_cpu_palrev;
DBGS(("setup_smp: nr_processors %ld\n",
hwrpb->nr_processors));
cpubase = (struct percpu_struct *)
((char*)hwrpb + hwrpb->processor_offset);
boot_cpu_palrev = cpubase->pal_revision;
for (i = 0; i < hwrpb->nr_processors; i++) {
cpu = (struct percpu_struct *)
((char *)cpubase + i*hwrpb->processor_size);
if ((cpu->flags & 0x1cc) == 0x1cc) {
smp_num_probed++;
set_cpu_possible(i, true);
set_cpu_present(i, true);
cpu->pal_revision = boot_cpu_palrev;
}
DBGS(("setup_smp: CPU %d: flags 0x%lx type 0x%lx\n",
i, cpu->flags, cpu->type));
DBGS(("setup_smp: CPU %d: PAL rev 0x%lx\n",
i, cpu->pal_revision));
}
} else {
smp_num_probed = 1;
}
printk(KERN_INFO "SMP: %d CPUs probed -- cpu_present_mask = %lx\n",
smp_num_probed, cpumask_bits(cpu_present_mask)[0]);
}
/*
* Called by smp_init prepare the secondaries
*/
void __init
smp_prepare_cpus(unsigned int max_cpus)
{
/* Take care of some initial bookkeeping. */
memset(ipi_data, 0, sizeof(ipi_data));
current_thread_info()->cpu = boot_cpuid;
smp_store_cpu_info(boot_cpuid);
smp_setup_percpu_timer(boot_cpuid);
/* Nothing to do on a UP box, or when told not to. */
if (smp_num_probed == 1 || max_cpus == 0) {
init_cpu_possible(cpumask_of(boot_cpuid));
init_cpu_present(cpumask_of(boot_cpuid));
printk(KERN_INFO "SMP mode deactivated.\n");
return;
}
printk(KERN_INFO "SMP starting up secondaries.\n");
smp_num_cpus = smp_num_probed;
}
void
smp_prepare_boot_cpu(void)
{
}
int
__cpu_up(unsigned int cpu, struct task_struct *tidle)
{
smp_boot_one_cpu(cpu, tidle);
return cpu_online(cpu) ? 0 : -ENOSYS;
}
void __init
smp_cpus_done(unsigned int max_cpus)
{
int cpu;
unsigned long bogosum = 0;
for(cpu = 0; cpu < NR_CPUS; cpu++)
if (cpu_online(cpu))
bogosum += cpu_data[cpu].loops_per_jiffy;
printk(KERN_INFO "SMP: Total of %d processors activated "
"(%lu.%02lu BogoMIPS).\n",
num_online_cpus(),
(bogosum + 2500) / (500000/HZ),
((bogosum + 2500) / (5000/HZ)) % 100);
}
int
setup_profiling_timer(unsigned int multiplier)
{
return -EINVAL;
}
static void
send_ipi_message(const struct cpumask *to_whom, enum ipi_message_type operation)
{
int i;
mb();
for_each_cpu(i, to_whom)
set_bit(operation, &ipi_data[i].bits);
mb();
for_each_cpu(i, to_whom)
wripir(i);
}
void
handle_ipi(struct pt_regs *regs)
{
int this_cpu = smp_processor_id();
unsigned long *pending_ipis = &ipi_data[this_cpu].bits;
unsigned long ops;
#if 0
DBGS(("handle_ipi: on CPU %d ops 0x%lx PC 0x%lx\n",
this_cpu, *pending_ipis, regs->pc));
#endif
mb(); /* Order interrupt and bit testing. */
while ((ops = xchg(pending_ipis, 0)) != 0) {
mb(); /* Order bit clearing and data access. */
do {
unsigned long which;
which = ops & -ops;
ops &= ~which;
which = __ffs(which);
switch (which) {
case IPI_RESCHEDULE:
scheduler_ipi();
break;
case IPI_CALL_FUNC:
generic_smp_call_function_interrupt();
break;
case IPI_CPU_STOP:
halt();
default:
printk(KERN_CRIT "Unknown IPI on CPU %d: %lu\n",
this_cpu, which);
break;
}
} while (ops);
mb(); /* Order data access and bit testing. */
}
cpu_data[this_cpu].ipi_count++;
if (hwrpb->txrdy)
recv_secondary_console_msg();
}
void
smp_send_reschedule(int cpu)
{
#ifdef DEBUG_IPI_MSG
if (cpu == hard_smp_processor_id())
printk(KERN_WARNING
"smp_send_reschedule: Sending IPI to self.\n");
#endif
send_ipi_message(cpumask_of(cpu), IPI_RESCHEDULE);
}
void
smp_send_stop(void)
{
cpumask_t to_whom;
cpumask_copy(&to_whom, cpu_possible_mask);
cpumask_clear_cpu(smp_processor_id(), &to_whom);
#ifdef DEBUG_IPI_MSG
if (hard_smp_processor_id() != boot_cpu_id)
printk(KERN_WARNING "smp_send_stop: Not on boot cpu.\n");
#endif
send_ipi_message(&to_whom, IPI_CPU_STOP);
}
void arch_send_call_function_ipi_mask(const struct cpumask *mask)
{
send_ipi_message(mask, IPI_CALL_FUNC);
}
void arch_send_call_function_single_ipi(int cpu)
{
send_ipi_message(cpumask_of(cpu), IPI_CALL_FUNC);
}
static void
ipi_imb(void *ignored)
{
imb();
}
void
smp_imb(void)
{
/* Must wait other processors to flush their icache before continue. */
if (on_each_cpu(ipi_imb, NULL, 1))
printk(KERN_CRIT "smp_imb: timed out\n");
}
EXPORT_SYMBOL(smp_imb);
static void
ipi_flush_tlb_all(void *ignored)
{
tbia();
}
void
flush_tlb_all(void)
{
/* Although we don't have any data to pass, we do want to
synchronize with the other processors. */
if (on_each_cpu(ipi_flush_tlb_all, NULL, 1)) {
printk(KERN_CRIT "flush_tlb_all: timed out\n");
}
}
#define asn_locked() (cpu_data[smp_processor_id()].asn_lock)
static void
ipi_flush_tlb_mm(void *x)
{
struct mm_struct *mm = (struct mm_struct *) x;
if (mm == current->active_mm && !asn_locked())
flush_tlb_current(mm);
else
flush_tlb_other(mm);
}
void
flush_tlb_mm(struct mm_struct *mm)
{
preempt_disable();
if (mm == current->active_mm) {
flush_tlb_current(mm);
if (atomic_read(&mm->mm_users) <= 1) {
int cpu, this_cpu = smp_processor_id();
for (cpu = 0; cpu < NR_CPUS; cpu++) {
if (!cpu_online(cpu) || cpu == this_cpu)
continue;
if (mm->context[cpu])
mm->context[cpu] = 0;
}
preempt_enable();
return;
}
}
if (smp_call_function(ipi_flush_tlb_mm, mm, 1)) {
printk(KERN_CRIT "flush_tlb_mm: timed out\n");
}
preempt_enable();
}
EXPORT_SYMBOL(flush_tlb_mm);
struct flush_tlb_page_struct {
struct vm_area_struct *vma;
struct mm_struct *mm;
unsigned long addr;
};
static void
ipi_flush_tlb_page(void *x)
{
struct flush_tlb_page_struct *data = (struct flush_tlb_page_struct *)x;
struct mm_struct * mm = data->mm;
if (mm == current->active_mm && !asn_locked())
flush_tlb_current_page(mm, data->vma, data->addr);
else
flush_tlb_other(mm);
}
void
flush_tlb_page(struct vm_area_struct *vma, unsigned long addr)
{
struct flush_tlb_page_struct data;
struct mm_struct *mm = vma->vm_mm;
preempt_disable();
if (mm == current->active_mm) {
flush_tlb_current_page(mm, vma, addr);
if (atomic_read(&mm->mm_users) <= 1) {
int cpu, this_cpu = smp_processor_id();
for (cpu = 0; cpu < NR_CPUS; cpu++) {
if (!cpu_online(cpu) || cpu == this_cpu)
continue;
if (mm->context[cpu])
mm->context[cpu] = 0;
}
preempt_enable();
return;
}
}
data.vma = vma;
data.mm = mm;
data.addr = addr;
if (smp_call_function(ipi_flush_tlb_page, &data, 1)) {
printk(KERN_CRIT "flush_tlb_page: timed out\n");
}
preempt_enable();
}
EXPORT_SYMBOL(flush_tlb_page);
void
flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end)
{
/* On the Alpha we always flush the whole user tlb. */
flush_tlb_mm(vma->vm_mm);
}
EXPORT_SYMBOL(flush_tlb_range);
static void
ipi_flush_icache_page(void *x)
{
struct mm_struct *mm = (struct mm_struct *) x;
if (mm == current->active_mm && !asn_locked())
__load_new_mm_context(mm);
else
flush_tlb_other(mm);
}
void
flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
unsigned long addr, int len)
{
struct mm_struct *mm = vma->vm_mm;
if ((vma->vm_flags & VM_EXEC) == 0)
return;
preempt_disable();
if (mm == current->active_mm) {
__load_new_mm_context(mm);
if (atomic_read(&mm->mm_users) <= 1) {
int cpu, this_cpu = smp_processor_id();
for (cpu = 0; cpu < NR_CPUS; cpu++) {
if (!cpu_online(cpu) || cpu == this_cpu)
continue;
if (mm->context[cpu])
mm->context[cpu] = 0;
}
preempt_enable();
return;
}
}
if (smp_call_function(ipi_flush_icache_page, mm, 1)) {
printk(KERN_CRIT "flush_icache_page: timed out\n");
}
preempt_enable();
}
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