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Subject[PATCH][2.5][6/15] smp_call_function/_on_cpu - mips64
 smp.c |   74 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++---------
1 files changed, 65 insertions(+), 9 deletions(-)

Index: linux-2.5.59-bk/arch/mips64/kernel/smp.c
===================================================================
RCS file: /build/cvsroot/linux-2.5.59-bk/arch/mips64/kernel/smp.c,v
retrieving revision 1.1.1.1
diff -u -r1.1.1.1 smp.c
--- linux-2.5.59-bk/arch/mips64/kernel/smp.c 9 Feb 2003 09:08:29 -0000 1.1.1.1
+++ linux-2.5.59-bk/arch/mips64/kernel/smp.c 9 Feb 2003 11:45:12 -0000
@@ -92,7 +92,7 @@

void smp_send_stop(void)
{
- smp_call_function(stop_this_cpu, NULL, 1, 0);
+ smp_call_function(stop_this_cpu, NULL, 0);
smp_num_cpus = 1;
}

@@ -116,7 +116,6 @@
* Run a function on all other CPUs.
* <func> The function to run. This must be fast and non-blocking.
* <info> An arbitrary pointer to pass to the function.
- * <retry> If true, keep retrying until ready.
* <wait> If true, wait until function has completed on other CPUs.
* [RETURNS] 0 on success, else a negative status code.
*
@@ -131,15 +130,14 @@
int wait;
} *call_data;

-int smp_call_function (void (*func) (void *info), void *info, int retry,
- int wait)
+int smp_call_function (void (*func) (void *info), void *info, int wait)
{
struct call_data_struct data;
int i, cpus = smp_num_cpus-1;
static spinlock_t lock = SPIN_LOCK_UNLOCKED;

if (cpus == 0)
- return 0;
+ return -EINVAL;

data.func = func;
data.info = info;
@@ -167,6 +165,64 @@
return 0;
}

+/*
+ * smp_call_function_on_cpu - Runs func on all processors in the mask
+ *
+ * @func: The function to run. This must be fast and non-blocking.
+ * @info: An arbitrary pointer to pass to the function.
+ * @wait: If true, wait (atomically) until function has completed on other CPUs.
+ * @mask The bitmask of CPUs to call the function
+ *
+ * Returns 0 on success, else a negative status code. Does not return until
+ * remote CPUs are nearly ready to execute func or have executed it.
+ *
+ * You must not call this function with disabled interrupts or from a
+ * hardware interrupt handler or from a bottom half handler.
+ */
+
+int smp_call_function_on_cpu (void (*func) (void *info), void *info,
+ int wait, unsigned long mask)
+{
+ struct call_data_struct data;
+ int i, cpu, num_cpus = hweight32(mask);
+ static spinlock_t lock = SPIN_LOCK_UNLOCKED;
+
+ cpu = get_cpu();
+ if ((num_cpus == 0) || ((1UL << cpu) & mask)) {
+ put_cpu_no_resched();
+ return -EINVAL;
+ }
+
+ data.func = func;
+ data.info = info;
+ atomic_set(&data.started, 0);
+ data.wait = wait;
+ if (wait)
+ atomic_set(&data.finished, 0);
+
+ spin_lock_bh(&lock);
+ call_data = &data;
+ /* Send a message to all other CPUs and wait for them to respond */
+ for (i = 0; i < NR_CPUS; i++) {
+ if (!cpu_online(i))
+ continue;
+
+ if ((1UL << i) & mask)
+ sendintr(i, DOCALL);
+ }
+
+ /* Wait for response */
+ while (atomic_read(&data.started) != num_cpus)
+ barrier();
+
+ if (wait)
+ while (atomic_read(&data.finished) != num_cpus)
+ barrier();
+ spin_unlock_bh(&lock);
+ put_cpu_no_resched();
+ return 0;
+}
+
extern void smp_call_function_interrupt(int irq, void *d, struct pt_regs *r)
{
void (*func) (void *info) = call_data->func;
@@ -195,7 +251,7 @@

void flush_tlb_all(void)
{
- smp_call_function(flush_tlb_all_ipi, 0, 1, 1);
+ smp_call_function(flush_tlb_all_ipi, NULL, 1);
_flush_tlb_all();
}

@@ -220,7 +276,7 @@
void flush_tlb_mm(struct mm_struct *mm)
{
if ((atomic_read(&mm->mm_users) != 1) || (current->mm != mm)) {
- smp_call_function(flush_tlb_mm_ipi, (void *)mm, 1, 1);
+ smp_call_function(flush_tlb_mm_ipi, (void *)mm, 1);
} else {
int i;
for (i = 0; i < smp_num_cpus; i++)
@@ -252,7 +308,7 @@
fd.vma = vma;
fd.addr1 = start;
fd.addr2 = end;
- smp_call_function(flush_tlb_range_ipi, (void *)&fd, 1, 1);
+ smp_call_function(flush_tlb_range_ipi, (void *)&fd, 1);
} else {
int i;
for (i = 0; i < smp_num_cpus; i++)
@@ -276,7 +332,7 @@

fd.vma = vma;
fd.addr1 = page;
- smp_call_function(flush_tlb_page_ipi, (void *)&fd, 1, 1);
+ smp_call_function(flush_tlb_page_ipi, (void *)&fd, 1);
} else {
int i;
for (i = 0; i < smp_num_cpus; i++)
-
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