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Date: Sat, 27 Nov 2010 16:21:57 +0100
From: Tejun Heo <tj@...nel.org>
To: linux-kernel@...r.kernel.org, mingo@...hat.com, tglx@...utronix.de,
hpa@...or.com, x86@...nel.org, eric.dumazet@...il.com,
yinghai@...nel.org, brgerst@...il.com, gorcunov@...il.com,
penberg@...nel.org
Cc: Tejun Heo <tj@...nel.org>
Subject: [PATCH 08/16] x86: Use apic->cpu_to_logical_apicid() to find out logical apic id mapping early during boot
On x86_32, non-standard logical apicid mapping can be used by
different NUMA setups. The mapping can be determined while bringing
up each CPU after apic->init_apic_ldr(). The logical apicid is then
used to deliver IPIs and determine NUMA configuration.
Unfortunately, initializing at SMP bring up is too late for percpu
setup making static percpu variables setup w/o considering NUMA. This
also is different from how x86_64 is configured making the code
difficult to follow and maintain.
Use the unused apic->cpu_to_logical_apicid() to find out the logical
apic id mapping before SMP bring up. The callback is called once
during get_smp_config() and the output is recorded in
x86_cpu_to_logical_apicid. apic implementation is free to return
BAD_APICID from the callback if it can't be determined at the time.
The early mapping is later verified and reinitialized during SMP bring
up.
A stub implementation for apic->cpu_to_logical_apicid() is added for
each non-standard apic.
Signed-off-by: Tejun Heo <tj@...nel.org>
---
arch/x86/include/asm/apic.h | 14 +++++++++++++-
arch/x86/kernel/apic/apic.c | 12 ++++++++++--
arch/x86/kernel/apic/bigsmp_32.c | 10 ++++++++++
arch/x86/kernel/apic/es7000_32.c | 11 +++++++++++
arch/x86/kernel/apic/numaq_32.c | 10 ++++++++++
arch/x86/kernel/apic/summit_32.c | 10 ++++++++++
6 files changed, 64 insertions(+), 3 deletions(-)
diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h
index 8b4ef78..70ced53 100644
--- a/arch/x86/include/asm/apic.h
+++ b/arch/x86/include/asm/apic.h
@@ -299,6 +299,19 @@ struct apic {
unsigned long (*check_apicid_present)(int apicid);
void (*vector_allocation_domain)(int cpu, struct cpumask *retmask);
+ /*
+ * x86_32 specific method called very early during boot from
+ * get_smp_config(). It should return the logical apicid.
+ * x86_[bios]_cpu_to_apicid is initialized before this
+ * function is called.
+ *
+ * If logical apicid can't be determined that early, the
+ * function may return BAD_APICID. Logical apicid will be
+ * automatically configured after init_apic_ldr() while
+ * bringing up CPUs. Note that NUMA affinity won't work
+ * properly during early boot in this case.
+ */
+ int (*cpu_to_logical_apicid)(int cpu);
void (*init_apic_ldr)(void);
void (*ioapic_phys_id_map)(physid_mask_t *phys_map, physid_mask_t *retmap);
@@ -306,7 +319,6 @@ struct apic {
void (*setup_apic_routing)(void);
int (*multi_timer_check)(int apic, int irq);
int (*apicid_to_node)(int logical_apicid);
- int (*cpu_to_logical_apicid)(int cpu);
int (*cpu_present_to_apicid)(int mps_cpu);
void (*apicid_to_cpu_present)(int phys_apicid, physid_mask_t *retmap);
void (*setup_portio_remap)(void);
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 543bc37..4931b10 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -1254,8 +1254,13 @@ void __cpuinit setup_local_APIC(void)
#ifdef CONFIG_X86_32
/*
- * APIC LDR is initialized. Fetch and store logical_apic_id.
+ * APIC LDR is initialized. If logical_apicid mapping was
+ * initialized during get_smp_config(), make sure it matches
+ * the actual value.
*/
+ i = early_per_cpu(x86_cpu_to_logical_apicid, cpu);
+ WARN_ON(i != BAD_APICID && i != logical_smp_processor_id());
+ /* always use the value from LDR */
early_per_cpu(x86_cpu_to_logical_apicid, cpu) =
logical_smp_processor_id();
#endif
@@ -1984,7 +1989,10 @@ void __cpuinit generic_processor_info(int apicid, int version)
early_per_cpu(x86_cpu_to_apicid, cpu) = apicid;
early_per_cpu(x86_bios_cpu_apicid, cpu) = apicid;
#endif
-
+#ifdef CONFIG_X86_32
+ early_per_cpu(x86_cpu_to_logical_apicid, cpu) =
+ apic->cpu_to_logical_apicid(cpu);
+#endif
set_cpu_possible(cpu, true);
set_cpu_present(cpu, true);
}
diff --git a/arch/x86/kernel/apic/bigsmp_32.c b/arch/x86/kernel/apic/bigsmp_32.c
index 4c62592..e4d426b 100644
--- a/arch/x86/kernel/apic/bigsmp_32.c
+++ b/arch/x86/kernel/apic/bigsmp_32.c
@@ -45,6 +45,15 @@ static unsigned long bigsmp_check_apicid_present(int bit)
return 1;
}
+static int bigsmp_cpu_to_logical_apicid(int cpu)
+{
+ /*
+ * This is stub implementation which causes static percpu area
+ * layout to ignore NUMA affinity.
+ */
+ return BAD_APICID;
+}
+
static inline unsigned long calculate_ldr(int cpu)
{
unsigned long val, id;
@@ -210,6 +219,7 @@ struct apic apic_bigsmp = {
.check_apicid_present = bigsmp_check_apicid_present,
.vector_allocation_domain = bigsmp_vector_allocation_domain,
+ .cpu_to_logical_apicid = bigsmp_cpu_to_logical_apicid,
.init_apic_ldr = bigsmp_init_apic_ldr,
.ioapic_phys_id_map = bigsmp_ioapic_phys_id_map,
diff --git a/arch/x86/kernel/apic/es7000_32.c b/arch/x86/kernel/apic/es7000_32.c
index 6840681..d6199fc 100644
--- a/arch/x86/kernel/apic/es7000_32.c
+++ b/arch/x86/kernel/apic/es7000_32.c
@@ -460,6 +460,15 @@ static unsigned long es7000_check_apicid_present(int bit)
return physid_isset(bit, phys_cpu_present_map);
}
+static int es7000_cpu_to_logical_apicid(int cpu)
+{
+ /*
+ * This is stub implementation which causes static percpu area
+ * layout to ignore NUMA affinity.
+ */
+ return BAD_APICID;
+}
+
static unsigned long calculate_ldr(int cpu)
{
unsigned long id = per_cpu(x86_bios_cpu_apicid, cpu);
@@ -638,6 +647,7 @@ struct apic __refdata apic_es7000_cluster = {
.check_apicid_present = es7000_check_apicid_present,
.vector_allocation_domain = es7000_vector_allocation_domain,
+ .cpu_to_logical_apicid = es7000_cpu_to_logical_apicid,
.init_apic_ldr = es7000_init_apic_ldr_cluster,
.ioapic_phys_id_map = es7000_ioapic_phys_id_map,
@@ -702,6 +712,7 @@ struct apic __refdata apic_es7000 = {
.check_apicid_present = es7000_check_apicid_present,
.vector_allocation_domain = es7000_vector_allocation_domain,
+ .cpu_to_logical_apicid = es7000_cpu_to_logical_apicid,
.init_apic_ldr = es7000_init_apic_ldr,
.ioapic_phys_id_map = es7000_ioapic_phys_id_map,
diff --git a/arch/x86/kernel/apic/numaq_32.c b/arch/x86/kernel/apic/numaq_32.c
index 2b434d5..49cae83 100644
--- a/arch/x86/kernel/apic/numaq_32.c
+++ b/arch/x86/kernel/apic/numaq_32.c
@@ -346,6 +346,15 @@ static inline int numaq_apic_id_registered(void)
return 1;
}
+static int numaq_cpu_to_logical_apicid(int cpu)
+{
+ /*
+ * This is stub implementation which causes static percpu area
+ * layout to ignore NUMA affinity.
+ */
+ return BAD_APICID;
+}
+
static inline void numaq_init_apic_ldr(void)
{
/* Already done in NUMA-Q firmware */
@@ -496,6 +505,7 @@ struct apic __refdata apic_numaq = {
.check_apicid_present = numaq_check_apicid_present,
.vector_allocation_domain = numaq_vector_allocation_domain,
+ .cpu_to_logical_apicid = numaq_cpu_to_logical_apicid,
.init_apic_ldr = numaq_init_apic_ldr,
.ioapic_phys_id_map = numaq_ioapic_phys_id_map,
diff --git a/arch/x86/kernel/apic/summit_32.c b/arch/x86/kernel/apic/summit_32.c
index 1ef4c14..fc8bf8a 100644
--- a/arch/x86/kernel/apic/summit_32.c
+++ b/arch/x86/kernel/apic/summit_32.c
@@ -194,6 +194,15 @@ static unsigned long summit_check_apicid_present(int bit)
return 1;
}
+static int summit_cpu_to_logical_apicid(int cpu)
+{
+ /*
+ * This is stub implementation which causes static percpu area
+ * layout to ignore NUMA affinity.
+ */
+ return BAD_APICID;
+}
+
static void summit_init_apic_ldr(void)
{
unsigned long val, id;
@@ -511,6 +520,7 @@ struct apic apic_summit = {
.check_apicid_present = summit_check_apicid_present,
.vector_allocation_domain = summit_vector_allocation_domain,
+ .cpu_to_logical_apicid = summit_cpu_to_logical_apicid,
.init_apic_ldr = summit_init_apic_ldr,
.ioapic_phys_id_map = summit_ioapic_phys_id_map,
--
1.7.1
--
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