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Subject[PATCH 1/4] mce: Slim up struct mce
Date
From: Borislav Petkov <borislav.petkov@amd.com>

Drop unused ->apicid, make ->socketid __u16 since it is copied from
struct cpuinfo_86.phys_proc_id, reorder members and adjust padding so
that it remains packed and on a 64-byte boundary.

Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
---
arch/x86/include/asm/mce.h | 12 +++++-------
arch/x86/kernel/cpu/mcheck/mce-inject.c | 8 ++++----
arch/x86/kernel/cpu/mcheck/mce.c | 13 ++++++-------
drivers/edac/amd64_edac.c | 2 +-
drivers/edac/mce_amd.c | 4 ++--
include/trace/events/mce.h | 11 ++++-------
6 files changed, 22 insertions(+), 28 deletions(-)
diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h
index 6aefb14cbbc5..42e209e32231 100644
--- a/arch/x86/include/asm/mce.h
+++ b/arch/x86/include/asm/mce.h
@@ -67,15 +67,13 @@ struct mce {
__u64 time; /* wall time_t when error was detected */
__u8 cpuvendor; /* cpu vendor as encoded in system.h */
__u8 inject_flags; /* software inject flags */
- __u16 pad;
+ __u8 pad;
+ __u8 cs; /* code segment */
__u32 cpuid; /* CPUID 1 EAX */
- __u8 cs; /* code segment */
__u8 bank; /* machine check bank */
- __u8 cpu; /* cpu number; obsolete; use extcpu now */
- __u8 finished; /* entry is valid */
- __u32 extcpu; /* linux cpu number that detected the error */
- __u32 socketid; /* CPU socket ID */
- __u32 apicid; /* CPU initial apic ID */
+ __u8 finished; /* entry is valid */
+ __u16 socketid; /* CPU socket ID */
+ __u32 cpu; /* linux cpu number that detected the error */
__u64 mcgcap; /* MCGCAP MSR: machine check capabilities of CPU */
};

diff --git a/arch/x86/kernel/cpu/mcheck/mce-inject.c b/arch/x86/kernel/cpu/mcheck/mce-inject.c
index fc4beb393577..a19eace708f1 100644
--- a/arch/x86/kernel/cpu/mcheck/mce-inject.c
+++ b/arch/x86/kernel/cpu/mcheck/mce-inject.c
@@ -31,14 +31,14 @@
/* Update fake mce registers on current CPU. */
static void inject_mce(struct mce *m)
{
- struct mce *i = &per_cpu(injectm, m->extcpu);
+ struct mce *i = &per_cpu(injectm, m->cpu);

/* Make sure no one reads partially written injectm */
i->finished = 0;
mb();
m->finished = 0;
/* First set the fields after finished */
- i->extcpu = m->extcpu;
+ i->cpu = m->cpu;
mb();
/* Now write record in order, finished last (except above) */
memcpy(i, m, sizeof(struct mce));
@@ -111,7 +111,7 @@ static int raise_local(void)
struct mce *m = &__get_cpu_var(injectm);
int context = MCJ_CTX(m->inject_flags);
int ret = 0;
- int cpu = m->extcpu;
+ int cpu = m->cpu;

if (m->inject_flags & MCJ_EXCEPTION) {
printk(KERN_INFO "Triggering MCE exception on CPU %d\n", cpu);
@@ -217,7 +217,7 @@ static ssize_t mce_write(struct file *filp, const char __user *ubuf,
if (copy_from_user(&m, ubuf, usize))
return -EFAULT;

- if (m.extcpu >= num_possible_cpus() || !cpu_online(m.extcpu))
+ if (m.cpu >= num_possible_cpus() || !cpu_online(m.cpu))
return -EINVAL;

/*
diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 5a11ae2e9e91..a30d7af18e66 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -112,14 +112,13 @@ ATOMIC_NOTIFIER_HEAD(x86_mce_decoder_chain);
void mce_setup(struct mce *m)
{
memset(m, 0, sizeof(struct mce));
- m->cpu = m->extcpu = smp_processor_id();
+ m->cpu = smp_processor_id();
rdtscll(m->tsc);
/* We hope get_seconds stays lockless */
m->time = get_seconds();
m->cpuvendor = boot_cpu_data.x86_vendor;
m->cpuid = cpuid_eax(1);
- m->socketid = cpu_data(m->extcpu).phys_proc_id;
- m->apicid = cpu_data(m->extcpu).initial_apicid;
+ m->socketid = cpu_data(m->cpu).phys_proc_id;
rdmsrl(MSR_IA32_MCG_CAP, m->mcgcap);
}

@@ -243,7 +242,7 @@ static void print_mce(struct mce *m)
int ret = 0;

pr_emerg(HW_ERR "CPU %d: Machine Check Exception: %Lx Bank %d: %016Lx\n",
- m->extcpu, m->mcgstatus, m->bank, m->status);
+ m->cpu, m->mcgstatus, m->bank, m->status);

if (m->ip) {
pr_emerg(HW_ERR "RIP%s %02x:<%016Lx> ",
@@ -266,9 +265,9 @@ static void print_mce(struct mce *m)
* Note this output is parsed by external tools and old fields
* should not be changed.
*/
- pr_emerg(HW_ERR "PROCESSOR %u:%x TIME %llu SOCKET %u APIC %x microcode %x\n",
- m->cpuvendor, m->cpuid, m->time, m->socketid, m->apicid,
- cpu_data(m->extcpu).microcode);
+ pr_emerg(HW_ERR "PROCESSOR %u:%x TIME %llu SOCKET %u microcode %x\n",
+ m->cpuvendor, m->cpuid, m->time, m->socketid,
+ cpu_data(m->cpu).microcode);

/*
* Print out human-readable details about the MCE error,
diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index c9eee6d33e9a..08413377a43b 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -972,7 +972,7 @@ static u64 get_error_address(struct mce *m)
if ((addr & GENMASK(24, 47)) >> 24 != 0x00fdf7)
return addr;

- mce_nid = amd_get_nb_id(m->extcpu);
+ mce_nid = amd_get_nb_id(m->cpu);
pvt = mcis[mce_nid]->pvt_info;

amd64_read_pci_cfg(pvt->F1, DRAM_LOCAL_NODE_LIM, &tmp);
diff --git a/drivers/edac/mce_amd.c b/drivers/edac/mce_amd.c
index bd926ea2e00c..7752f81fa4d6 100644
--- a/drivers/edac/mce_amd.c
+++ b/drivers/edac/mce_amd.c
@@ -595,7 +595,7 @@ static bool nb_noop_mce(u16 ec, u8 xec)
void amd_decode_nb_mce(struct mce *m)
{
struct cpuinfo_x86 *c = &boot_cpu_data;
- int node_id = amd_get_nb_id(m->extcpu);
+ int node_id = amd_get_nb_id(m->cpu);
u16 ec = EC(m->status);
u8 xec = XEC(m->status, 0x1f);

@@ -753,7 +753,7 @@ int amd_decode_mce(struct notifier_block *nb, unsigned long val, void *data)
return NOTIFY_STOP;

pr_emerg(HW_ERR "CPU:%d\tMC%d_STATUS[%s|%s|%s|%s|%s",
- m->extcpu, m->bank,
+ m->cpu, m->bank,
((m->status & MCI_STATUS_OVER) ? "Over" : "-"),
((m->status & MCI_STATUS_UC) ? "UE" : "CE"),
((m->status & MCI_STATUS_MISCV) ? "MiscV" : "-"),
diff --git a/include/trace/events/mce.h b/include/trace/events/mce.h
index 4cbbcef6baa8..4c1740ac7889 100644
--- a/include/trace/events/mce.h
+++ b/include/trace/events/mce.h
@@ -25,8 +25,7 @@ TRACE_EVENT(mce_record,
__field( u64, walltime )
__field( u32, cpu )
__field( u32, cpuid )
- __field( u32, apicid )
- __field( u32, socketid )
+ __field( u16, socketid )
__field( u8, cs )
__field( u8, bank )
__field( u8, cpuvendor )
@@ -41,16 +40,15 @@ TRACE_EVENT(mce_record,
__entry->ip = m->ip;
__entry->tsc = m->tsc;
__entry->walltime = m->time;
- __entry->cpu = m->extcpu;
+ __entry->cpu = m->cpu;
__entry->cpuid = m->cpuid;
- __entry->apicid = m->apicid;
__entry->socketid = m->socketid;
__entry->cs = m->cs;
__entry->bank = m->bank;
__entry->cpuvendor = m->cpuvendor;
),

- TP_printk("CPU: %d, MCGc/s: %llx/%llx, MC%d: %016Lx, ADDR/MISC: %016Lx/%016Lx, RIP: %02x:<%016Lx>, TSC: %llx, PROCESSOR: %u:%x, TIME: %llu, SOCKET: %u, APIC: %x",
+ TP_printk("CPU: %d, MCGc/s: %llx/%llx, MC%d: %016Lx, ADDR/MISC: %016Lx/%016Lx, RIP: %02x:<%016Lx>, TSC: %llx, PROCESSOR: %u:%x, TIME: %llu, SOCKET: %u",
__entry->cpu,
__entry->mcgcap, __entry->mcgstatus,
__entry->bank, __entry->status,
@@ -59,8 +57,7 @@ TRACE_EVENT(mce_record,
__entry->tsc,
__entry->cpuvendor, __entry->cpuid,
__entry->walltime,
- __entry->socketid,
- __entry->apicid)
+ __entry->socketid)
);

#endif /* _TRACE_MCE_H */
--
1.7.8.rc0


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