Messages in this thread Patch in this message | | | Date | Wed, 22 Jan 2003 00:33:37 -0500 (EST) | From | Zwane Mwaikambo <> | Subject | PATCH][2.5][11/18] smp_call_function_on_cpu - ppc64 |
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Index: linux-2.5.59/arch/ppc64/kernel/smp.c =================================================================== RCS file: /build/cvsroot/linux-2.5.59/arch/ppc64/kernel/smp.c,v retrieving revision 1.1.1.1 diff -u -r1.1.1.1 smp.c --- linux-2.5.59/arch/ppc64/kernel/smp.c 17 Jan 2003 11:14:53 -0000 1.1.1.1 +++ linux-2.5.59/arch/ppc64/kernel/smp.c 22 Jan 2003 00:58:23 -0000 @@ -430,7 +430,7 @@ void smp_send_stop(void) { - smp_call_function(stop_this_cpu, NULL, 1, 0); + smp_call_function(stop_this_cpu, NULL, 0); } /* @@ -458,7 +458,6 @@ * [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. @@ -466,8 +465,7 @@ * 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 nonatomic, - int wait) +int smp_call_function (void (*func) (void *info), void *info, int wait) { struct call_data_struct data; int ret = -1, cpus = num_online_cpus()-1; @@ -525,6 +523,95 @@ out: HMT_medium(); spin_unlock(&call_lock); + return ret; +} + +/* + * 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 ret = 0, cpu, i, num_cpus = hweight64(mask); + unsigned long timeout; + + if (num_cpus == 0) + return -EINVAL; + + cpu = get_cpu(); + if ((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(&call_lock); + call_data = &data; + wmb(); + /* 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 << i) & mask)) + smp_message_pass(i, PPC_MSG_CALL_FUNCTION, 0, 0); + } + + /* Wait for response */ + timeout = SMP_CALL_TIMEOUT; + while (atomic_read(&data.started) != num_cpus) { + HMT_low(); + if (--timeout == 0) { + if (debugger) + debugger(0); + printk("smp_call_function on cpu %d: other cpus not " + "responding (%d)\n", cpu, + atomic_read(&data.started)); + ret = -EIO; + goto out; + } + } + + if (wait) { + timeout = SMP_CALL_TIMEOUT; + while (atomic_read(&data.finished) != num_cpus) { + HMT_low(); + if (--timeout == 0) { + if (debugger) + debugger(0); + printk("smp_call_function on cpu %d: other " + "cpus not finishing (%d/%d)\n", + cpu, + atomic_read(&data.finished), + atomic_read(&data.started)); + ret = -EIO; + goto out; + } + } + } + + ret = 0; + +out: + HMT_medium(); + spin_unlock(&call_lock); + put_cpu_no_resched(); return ret; } -- function.linuxpower.ca
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