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authorMichael Neuling <mikey@neuling.org>2010-05-13 19:40:11 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2010-05-21 17:31:11 +1000
commit1fc711f7ffb01089efc58042cfdbac8573d1b59a (patch)
tree7c057a32c140e8d617a9cff34ca5d2227e9acdb8
parentd504bed676caad29a3dba3d3727298c560628f5c (diff)
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powerpc/kexec: Fix race in kexec shutdown
In kexec_prepare_cpus, the primary CPU IPIs the secondary CPUs to kexec_smp_down(). kexec_smp_down() calls kexec_smp_wait() which sets the hw_cpu_id() to -1. The primary does this while leaving IRQs on which means the primary can take a timer interrupt which can lead to the IPIing one of the secondary CPUs (say, for a scheduler re-balance) but since the secondary CPU now has a hw_cpu_id = -1, we IPI CPU -1... Kaboom! We are hitting this case regularly on POWER7 machines. There is also a second race, where the primary will tear down the MMU mappings before knowing the secondaries have entered real mode. Also, the secondaries are clearing out any pending IPIs before guaranteeing that no more will be received. This changes kexec_prepare_cpus() so that we turn off IRQs in the primary CPU much earlier. It adds a paca flag to say that the secondaries have entered the kexec_smp_down() IPI and turned off IRQs, rather than overloading hw_cpu_id with -1. This new paca flag is again used to in indicate when the secondaries has entered real mode. It also ensures that all CPUs have their IRQs off before we clear out any pending IPI requests (in kexec_cpu_down()) to ensure there are no trailing IPIs left unacknowledged. Signed-off-by: Michael Neuling <mikey@neuling.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
-rw-r--r--arch/powerpc/include/asm/kexec.h4
-rw-r--r--arch/powerpc/include/asm/paca.h1
-rw-r--r--arch/powerpc/kernel/asm-offsets.c1
-rw-r--r--arch/powerpc/kernel/machine_kexec_64.c48
-rw-r--r--arch/powerpc/kernel/misc_64.S8
-rw-r--r--arch/powerpc/kernel/paca.c2
6 files changed, 47 insertions, 17 deletions
diff --git a/arch/powerpc/include/asm/kexec.h b/arch/powerpc/include/asm/kexec.h
index 7e06b43..a6ca6da 100644
--- a/arch/powerpc/include/asm/kexec.h
+++ b/arch/powerpc/include/asm/kexec.h
@@ -31,6 +31,10 @@
#define KEXEC_ARCH KEXEC_ARCH_PPC
#endif
+#define KEXEC_STATE_NONE 0
+#define KEXEC_STATE_IRQS_OFF 1
+#define KEXEC_STATE_REAL_MODE 2
+
#ifndef __ASSEMBLY__
#include <linux/cpumask.h>
#include <asm/reg.h>
diff --git a/arch/powerpc/include/asm/paca.h b/arch/powerpc/include/asm/paca.h
index a011603..971dfa4 100644
--- a/arch/powerpc/include/asm/paca.h
+++ b/arch/powerpc/include/asm/paca.h
@@ -82,6 +82,7 @@ struct paca_struct {
s16 hw_cpu_id; /* Physical processor number */
u8 cpu_start; /* At startup, processor spins until */
/* this becomes non-zero. */
+ u8 kexec_state; /* set when kexec down has irqs off */
#ifdef CONFIG_PPC_STD_MMU_64
struct slb_shadow *slb_shadow_ptr;
diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c
index 0271b58..1b784ff9 100644
--- a/arch/powerpc/kernel/asm-offsets.c
+++ b/arch/powerpc/kernel/asm-offsets.c
@@ -184,6 +184,7 @@ int main(void)
#endif /* CONFIG_PPC_STD_MMU_64 */
DEFINE(PACAEMERGSP, offsetof(struct paca_struct, emergency_sp));
DEFINE(PACAHWCPUID, offsetof(struct paca_struct, hw_cpu_id));
+ DEFINE(PACAKEXECSTATE, offsetof(struct paca_struct, kexec_state));
DEFINE(PACA_STARTPURR, offsetof(struct paca_struct, startpurr));
DEFINE(PACA_STARTSPURR, offsetof(struct paca_struct, startspurr));
DEFINE(PACA_USER_TIME, offsetof(struct paca_struct, user_time));
diff --git a/arch/powerpc/kernel/machine_kexec_64.c b/arch/powerpc/kernel/machine_kexec_64.c
index 040bd1d..26f9900 100644
--- a/arch/powerpc/kernel/machine_kexec_64.c
+++ b/arch/powerpc/kernel/machine_kexec_64.c
@@ -155,33 +155,38 @@ void kexec_copy_flush(struct kimage *image)
#ifdef CONFIG_SMP
-/* FIXME: we should schedule this function to be called on all cpus based
- * on calling the interrupts, but we would like to call it off irq level
- * so that the interrupt controller is clean.
- */
+static int kexec_all_irq_disabled = 0;
+
static void kexec_smp_down(void *arg)
{
+ local_irq_disable();
+ mb(); /* make sure our irqs are disabled before we say they are */
+ get_paca()->kexec_state = KEXEC_STATE_IRQS_OFF;
+ while(kexec_all_irq_disabled == 0)
+ cpu_relax();
+ mb(); /* make sure all irqs are disabled before this */
+ /*
+ * Now every CPU has IRQs off, we can clear out any pending
+ * IPIs and be sure that no more will come in after this.
+ */
if (ppc_md.kexec_cpu_down)
ppc_md.kexec_cpu_down(0, 1);
- local_irq_disable();
kexec_smp_wait();
/* NOTREACHED */
}
-static void kexec_prepare_cpus(void)
+static void kexec_prepare_cpus_wait(int wait_state)
{
int my_cpu, i, notified=-1;
- smp_call_function(kexec_smp_down, NULL, /* wait */0);
my_cpu = get_cpu();
-
- /* check the others cpus are now down (via paca hw cpu id == -1) */
+ /* Make sure each CPU has atleast made it to the state we need */
for (i=0; i < NR_CPUS; i++) {
if (i == my_cpu)
continue;
- while (paca[i].hw_cpu_id != -1) {
+ while (paca[i].kexec_state < wait_state) {
barrier();
if (!cpu_possible(i)) {
printk("kexec: cpu %d hw_cpu_id %d is not"
@@ -201,20 +206,35 @@ static void kexec_prepare_cpus(void)
}
if (i != notified) {
printk( "kexec: waiting for cpu %d (physical"
- " %d) to go down\n",
- i, paca[i].hw_cpu_id);
+ " %d) to enter %i state\n",
+ i, paca[i].hw_cpu_id, wait_state);
notified = i;
}
}
}
+ mb();
+}
+
+static void kexec_prepare_cpus(void)
+{
+
+ smp_call_function(kexec_smp_down, NULL, /* wait */0);
+ local_irq_disable();
+ mb(); /* make sure IRQs are disabled before we say they are */
+ get_paca()->kexec_state = KEXEC_STATE_IRQS_OFF;
+
+ kexec_prepare_cpus_wait(KEXEC_STATE_IRQS_OFF);
+ /* we are sure every CPU has IRQs off at this point */
+ kexec_all_irq_disabled = 1;
/* after we tell the others to go down */
if (ppc_md.kexec_cpu_down)
ppc_md.kexec_cpu_down(0, 0);
- put_cpu();
+ /* Before removing MMU mapings make sure all CPUs have entered real mode */
+ kexec_prepare_cpus_wait(KEXEC_STATE_REAL_MODE);
- local_irq_disable();
+ put_cpu();
}
#else /* ! SMP */
diff --git a/arch/powerpc/kernel/misc_64.S b/arch/powerpc/kernel/misc_64.S
index a5cf9c1..a2b18df 100644
--- a/arch/powerpc/kernel/misc_64.S
+++ b/arch/powerpc/kernel/misc_64.S
@@ -24,6 +24,7 @@
#include <asm/asm-offsets.h>
#include <asm/cputable.h>
#include <asm/thread_info.h>
+#include <asm/kexec.h>
.text
@@ -471,6 +472,10 @@ _GLOBAL(kexec_wait)
1: mflr r5
addi r5,r5,kexec_flag-1b
+ li r4,KEXEC_STATE_REAL_MODE
+ stb r4,PACAKEXECSTATE(r13)
+ SYNC
+
99: HMT_LOW
#ifdef CONFIG_KEXEC /* use no memory without kexec */
lwz r4,0(r5)
@@ -494,14 +499,11 @@ kexec_flag:
* note: this is a terminal routine, it does not save lr
*
* get phys id from paca
- * set paca id to -1 to say we got here
* switch to real mode
* join other cpus in kexec_wait(phys_id)
*/
_GLOBAL(kexec_smp_wait)
lhz r3,PACAHWCPUID(r13)
- li r4,-1
- sth r4,PACAHWCPUID(r13) /* let others know we left */
bl real_mode
b .kexec_wait
diff --git a/arch/powerpc/kernel/paca.c b/arch/powerpc/kernel/paca.c
index 0c40c6f..f88acf0 100644
--- a/arch/powerpc/kernel/paca.c
+++ b/arch/powerpc/kernel/paca.c
@@ -18,6 +18,7 @@
#include <asm/pgtable.h>
#include <asm/iseries/lpar_map.h>
#include <asm/iseries/hv_types.h>
+#include <asm/kexec.h>
/* This symbol is provided by the linker - let it fill in the paca
* field correctly */
@@ -97,6 +98,7 @@ void __init initialise_paca(struct paca_struct *new_paca, int cpu)
new_paca->kernelbase = (unsigned long) _stext;
new_paca->kernel_msr = MSR_KERNEL;
new_paca->hw_cpu_id = 0xffff;
+ new_paca->kexec_state = KEXEC_STATE_NONE;
new_paca->__current = &init_task;
#ifdef CONFIG_PPC_STD_MMU_64
new_paca->slb_shadow_ptr = &slb_shadow[cpu];