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Subject[PATCH][2.5][10/15] smp_call_function/_on_cpu - s390
 smp.c |   75 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++--------
1 files changed, 66 insertions(+), 9 deletions(-)

Index: linux-2.5.59-bk/arch/s390/kernel/smp.c
===================================================================
RCS file: /build/cvsroot/linux-2.5.59-bk/arch/s390/kernel/smp.c,v
retrieving revision 1.1.1.1
diff -u -r1.1.1.1 smp.c
--- linux-2.5.59-bk/arch/s390/kernel/smp.c 9 Feb 2003 09:08:34 -0000 1.1.1.1
+++ linux-2.5.59-bk/arch/s390/kernel/smp.c 9 Feb 2003 09:23:30 -0000
@@ -102,13 +102,10 @@
* in the system.
*/

-int smp_call_function (void (*func) (void *info), void *info, int nonatomic,
- int wait)
/*
* [SUMMARY] 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.
- * <nonatomic> currently unused.
* <wait> If true, wait (atomically) until function has completed on other CPUs.
* [RETURNS] 0 on success, else a negative status code. Does not return until
* remote CPUs are nearly ready to execute <<func>> or are or have executed.
@@ -116,6 +113,8 @@
* 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 (void (*func) (void *info), void *info, int wait)
{
struct call_data_struct data;
int cpus = num_online_cpus()-1;
@@ -148,6 +147,64 @@
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);
+
+ /* FIXME: get cpu lock -hc */
+ if (num_cpus == 0)
+ return 0;
+
+ cpu = get_cpu();
+ if ((1UL << cpu) & mask) {
+ put_cpu_no_resched();
+ return 0;
+ }
+
+ data.func = func;
+ data.info = info;
+ atomic_set(&data.started, 0);
+ data.wait = wait;
+ if (wait)
+ atomic_set(&data.finished, 0);
+
+ spin_lock(&call_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) && ((1UL << cpu) && mask))
+ smp_ext_bitcall(i, ec_call_function);
+ }
+
+ /* Wait for response */
+ while (atomic_read(&data.started) != num_cpus)
+ barrier();
+
+ if (wait)
+ while (atomic_read(&data.finished) != num_cpus)
+ barrier();
+ spin_unlock(&call_lock);
+ put_cpu_no_resched();
+ return 0;
+}
+
static inline void do_send_stop(void)
{
u32 dummy;
@@ -228,7 +285,7 @@
void machine_restart_smp(char * __unused)
{
cpu_restart_map = cpu_online_map;
- smp_call_function(do_machine_restart, NULL, 0, 0);
+ smp_call_function(do_machine_restart, NULL, 0);
do_machine_restart(NULL);
}

@@ -247,7 +304,7 @@

void machine_halt_smp(void)
{
- smp_call_function(do_machine_halt, NULL, 0, 0);
+ smp_call_function(do_machine_halt, NULL, 0);
do_machine_halt(NULL);
}

@@ -266,7 +323,7 @@

void machine_power_off_smp(void)
{
- smp_call_function(do_machine_power_off, NULL, 0, 0);
+ smp_call_function(do_machine_power_off, NULL, 0);
do_machine_power_off(NULL);
}

@@ -339,7 +396,7 @@

void smp_ptlb_all(void)
{
- smp_call_function(smp_ptlb_callback, NULL, 0, 1);
+ smp_call_function(smp_ptlb_callback, NULL, 1);
local_flush_tlb();
}

@@ -400,7 +457,7 @@
parms.end_ctl = cr;
parms.orvals[cr] = 1 << bit;
parms.andvals[cr] = 0xFFFFFFFF;
- smp_call_function(smp_ctl_bit_callback, &parms, 0, 1);
+ smp_call_function(smp_ctl_bit_callback, &parms, 1);
__ctl_set_bit(cr, bit);
}

@@ -414,7 +471,7 @@
parms.end_ctl = cr;
parms.orvals[cr] = 0x00000000;
parms.andvals[cr] = ~(1 << bit);
- smp_call_function(smp_ctl_bit_callback, &parms, 0, 1);
+ smp_call_function(smp_ctl_bit_callback, &parms, 1);
__ctl_clear_bit(cr, bit);
}

-
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