#include <asm/mtrr.h>
#include <asm/pgalloc.h>
#include <asm/tlbflush.h>
-
-/*
- * the following functions deal with sending IPIs between CPUs.
- *
- * We use 'broadcast', CPU->CPU IPIs and self-IPIs too.
- */
-
-static inline unsigned int __prepare_ICR (unsigned int shortcut, int vector)
-{
- unsigned int icr = APIC_DM_FIXED | shortcut | vector | APIC_DEST_LOGICAL;
- if (vector == KDB_VECTOR)
- icr = (icr & (~APIC_VECTOR_MASK)) | APIC_DM_NMI;
- return icr;
-}
-
-static inline int __prepare_ICR2 (unsigned int mask)
-{
- return SET_APIC_DEST_FIELD(mask);
-}
-
-static inline void __send_IPI_shortcut(unsigned int shortcut, int vector)
-{
- /*
- * Subtle. In the case of the 'never do double writes' workaround
- * we have to lock out interrupts to be safe. As we don't care
- * of the value read we use an atomic rmw access to avoid costly
- * cli/sti. Otherwise we use an even cheaper single atomic write
- * to the APIC.
- */
- unsigned int cfg;
-
- /*
- * Wait for idle.
- */
- apic_wait_icr_idle();
-
- /*
- * No need to touch the target chip field
- */
- cfg = __prepare_ICR(shortcut, vector);
-
- /*
- * Send the IPI. The write to APIC_ICR fires this off.
- */
- apic_write_around(APIC_ICR, cfg);
-}
-
-static inline void send_IPI_allbutself(int vector)
-{
- /*
- * if there are no other CPUs in the system then
- * we get an APIC send error if we try to broadcast.
- * thus we have to avoid sending IPIs in this case.
- */
- if (num_online_cpus() > 1)
- __send_IPI_shortcut(APIC_DEST_ALLBUT, vector);
-}
-
-static inline void send_IPI_all(int vector)
-{
- __send_IPI_shortcut(APIC_DEST_ALLINC, vector);
-}
-
-void send_IPI_self(int vector)
-{
- __send_IPI_shortcut(APIC_DEST_SELF, vector);
-}
-
-static inline void send_IPI_mask(cpumask_t cpumask, int vector)
-{
- unsigned long mask = cpus_coerce(cpumask);
- unsigned long cfg;
- unsigned long flags;
-
- local_save_flags(flags);
- local_irq_disable();
-
- /*
- * Wait for idle.
- */
- apic_wait_icr_idle();
-
- /*
- * prepare target chip field
- */
- cfg = __prepare_ICR2(mask);
- apic_write_around(APIC_ICR2, cfg);
-
- /*
- * program the ICR
- */
- cfg = __prepare_ICR(0, vector);
-
- /*
- * Send the IPI. The write to APIC_ICR fires this off.
- */
- apic_write_around(APIC_ICR, cfg);
- local_irq_restore(flags);
-}
+#include <asm/mach_apic.h>
+#include <asm/proto.h>
/*
* Smarter SMP flushing macros.
static cpumask_t flush_cpumask;
static struct mm_struct * flush_mm;
static unsigned long flush_va;
-static spinlock_t tlbstate_lock = SPIN_LOCK_UNLOCKED;
+static DEFINE_SPINLOCK(tlbstate_lock);
#define FLUSH_ALL 0xffffffff
/*
void flush_tlb_all(void)
{
- on_each_cpu(do_flush_tlb_all, 0, 1, 1);
+ on_each_cpu(do_flush_tlb_all, NULL, 1, 1);
}
void smp_kdb_stop(void)
* Structure and data for smp_call_function(). This is designed to minimise
* static memory requirements. It also looks cleaner.
*/
-static spinlock_t call_lock = SPIN_LOCK_UNLOCKED;
+static DEFINE_SPINLOCK(call_lock);
struct call_data_struct {
void (*func) (void *info);
* this function sends a 'generic call function' IPI to all other CPUs
* 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.
- *
- * You must not call this function with disabled interrupts or from a
- * hardware interrupt handler or from a bottom half handler.
- */
+static void __smp_call_function (void (*func) (void *info), void *info,
+ int nonatomic, int wait)
{
struct call_data_struct data;
int cpus = num_online_cpus()-1;
if (!cpus)
- return 0;
-
- /* Can deadlock when called with interrupts disabled */
- WARN_ON(irqs_disabled());
+ return;
data.func = func;
data.info = info;
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 */
/* Wait for response */
while (atomic_read(&data.started) != cpus)
- barrier();
+ cpu_relax();
- if (wait)
- while (atomic_read(&data.finished) != cpus)
- barrier();
- spin_unlock(&call_lock);
+ if (!wait)
+ return;
+ while (atomic_read(&data.finished) != cpus)
+ cpu_relax();
+}
+
+/*
+ * smp_call_function - 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.
+ *
+ * You must not call this function with disabled interrupts or from a
+ * hardware interrupt handler or from a bottom half handler.
+ * Actually there are a few legal cases, like panic.
+ */
+int smp_call_function (void (*func) (void *info), void *info, int nonatomic,
+ int wait)
+{
+ spin_lock(&call_lock);
+ __smp_call_function(func,info,nonatomic,wait);
+ spin_unlock(&call_lock);
return 0;
}
void smp_send_stop(void)
{
- smp_call_function(smp_really_stop_cpu, NULL, 1, 0);
+ int nolock = 0;
+ if (reboot_force)
+ return;
+ /* Don't deadlock on the call lock in panic */
+ if (!spin_trylock(&call_lock)) {
+ /* ignore locking because we have paniced anyways */
+ nolock = 1;
+ }
+ __smp_call_function(smp_really_stop_cpu, NULL, 0, 0);
+ if (!nolock)
+ spin_unlock(&call_lock);
smp_stop_cpu();
}
git://git.onelab.eu / linux-2.6.git / blobdiff