Add an x86_init vector for handling inconsistent core numbering. This is
useful for multi-fabric platforms, such as Numascale NumaConnect.

v2:
- use struct x86_cpuinit_ops
- provide default fall-back function to warn

Signed-off-by: Daniel J Blueman <daniel@numascale-asia.com>
---
arch/x86/include/asm/x86_init.h | 3 +++
arch/x86/kernel/cpu/amd.c | 7 +++++++
arch/x86/kernel/cpu/common.c | 5 +++++
arch/x86/kernel/x86_init.c | 1 +
4 files changed, 16 insertions(+), 0 deletions(-)

diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h
index 1971e65..1ac860a 100644
--- a/arch/x86/include/asm/x86_init.h
+++ b/arch/x86/include/asm/x86_init.h
@@ -7,6 +7,7 @@
struct mpc_bus;
struct mpc_cpu;
struct mpc_table;
+struct cpuinfo_x86;

/**
* struct x86_init_mpparse - platform specific mpparse ops
@@ -147,6 +148,7 @@ struct x86_init_ops {
*/
struct x86_cpuinit_ops {
void (*setup_percpu_clockev)(void);
+ void (*fixup_cpu_id)(struct cpuinfo_x86 *c, int node);
};

/**
@@ -186,5 +188,6 @@ extern struct x86_msi_ops x86_msi;

extern void x86_init_noop(void);
extern void x86_init_uint_noop(unsigned int unused);
+extern void x86_default_fixup_cpu_id(struct cpuinfo_x86 *c, int node);

#endif
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index c7e46cb..619377a 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -353,6 +353,13 @@ static void __cpuinit srat_detect_node(struct cpuinfo_x86 *c)
if (node == NUMA_NO_NODE)
node = per_cpu(cpu_llc_id, cpu);

+ /*
+ * If core numbers are inconsistent, it's likely a multi-fabric platform,
+ * so invoke platform-specific handler
+ */
+ if (c->phys_proc_id != node)
+ x86_cpuinit.fixup_cpu_id(c, node);
+
if (!node_online(node)) {
/*
* Two possibilities here:
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index aa003b1..c91c793 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -1141,6 +1141,15 @@ static void dbg_restore_debug_regs(void)
#endif /* ! CONFIG_KGDB */

/*
+ * Prints an error where the NUMA and configured core-number mismatch and the
+ * platform didn't override this to fix it up
+ */
+void __cpuinit x86_default_fixup_cpu_id(struct cpuinfo_x86 *c, int node)
+{
+ pr_err("NUMA core number %d differs from configured core number %d
", node, c->phys_proc_id);
+}
+
+/*
* cpu_init() initializes state that is per-CPU. Some data is already
* initialized (naturally) in the bootstrap process, such as the GDT
* and IDT. We reload them nevertheless, this function acts as adiff --git a/arch/x86/kernel/x86_init.c b/arch/x86/kernel/x86_init.c
index c1d6cd5..91f83e2 100644
--- a/arch/x86/kernel/x86_init.c
+++ b/arch/x86/kernel/x86_init.c
@@ -92,6 +92,7 @@ struct x86_init_ops x86_init __initdata = {

struct x86_cpuinit_ops x86_cpuinit __cpuinitdata = {
.setup_percpu_clockev = setup_secondary_APIC_clock,
+ .fixup_cpu_id = x86_default_fixup_cpu_id,
};

static void default_nmi_init(void) { };
--
1.7.5.4


--------------070508070702010501080908
Content-Type: text/x-patch;
name="0003-Add-support-for-Numascale-s-NumaChip.patch"
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
filename="0003-Add-support-for-Numascale-s-NumaChip.patch"