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-rw-r--r--arch/x86/Kconfig2
-rw-r--r--arch/x86/include/asm/amd_nb.h31
-rw-r--r--arch/x86/kernel/cpu/mce/amd.c127
3 files changed, 27 insertions, 133 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 9d7bd0ae48c4..e4e27d44dc2b 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1189,7 +1189,7 @@ config X86_MCE_INTEL
config X86_MCE_AMD
def_bool y
prompt "AMD MCE features"
- depends on X86_MCE && X86_LOCAL_APIC && AMD_NB
+ depends on X86_MCE && X86_LOCAL_APIC
help
Additional support for AMD specific MCE features such as
the DRAM Error Threshold.
diff --git a/arch/x86/include/asm/amd_nb.h b/arch/x86/include/asm/amd_nb.h
index d0caac26533f..4f586fc699fd 100644
--- a/arch/x86/include/asm/amd_nb.h
+++ b/arch/x86/include/asm/amd_nb.h
@@ -4,7 +4,6 @@
#include <linux/ioport.h>
#include <linux/pci.h>
-#include <linux/refcount.h>
struct amd_nb_bus_dev_range {
u8 bus;
@@ -29,41 +28,11 @@ struct amd_l3_cache {
u8 subcaches[4];
};
-struct threshold_block {
- unsigned int block; /* Number within bank */
- unsigned int bank; /* MCA bank the block belongs to */
- unsigned int cpu; /* CPU which controls MCA bank */
- u32 address; /* MSR address for the block */
- u16 interrupt_enable; /* Enable/Disable APIC interrupt */
- bool interrupt_capable; /* Bank can generate an interrupt. */
-
- u16 threshold_limit; /*
- * Value upon which threshold
- * interrupt is generated.
- */
-
- struct kobject kobj; /* sysfs object */
- struct list_head miscj; /*
- * List of threshold blocks
- * within a bank.
- */
-};
-
-struct threshold_bank {
- struct kobject *kobj;
- struct threshold_block *blocks;
-
- /* initialized to the number of CPUs on the node sharing this bank */
- refcount_t cpus;
- unsigned int shared;
-};
-
struct amd_northbridge {
struct pci_dev *root;
struct pci_dev *misc;
struct pci_dev *link;
struct amd_l3_cache l3_cache;
- struct threshold_bank *bank4;
};
struct amd_northbridge_info {
diff --git a/arch/x86/kernel/cpu/mce/amd.c b/arch/x86/kernel/cpu/mce/amd.c
index 018874b554cb..1075a90141da 100644
--- a/arch/x86/kernel/cpu/mce/amd.c
+++ b/arch/x86/kernel/cpu/mce/amd.c
@@ -4,8 +4,6 @@
*
* Written by Jacob Shin - AMD, Inc.
* Maintained by: Borislav Petkov <bp@alien8.de>
- *
- * All MC4_MISCi registers are shared between cores on a node.
*/
#include <linux/interrupt.h>
#include <linux/notifier.h>
@@ -20,7 +18,6 @@
#include <linux/smp.h>
#include <linux/string.h>
-#include <asm/amd_nb.h>
#include <asm/traps.h>
#include <asm/apic.h>
#include <asm/mce.h>
@@ -221,6 +218,32 @@ static const struct smca_hwid smca_hwid_mcatypes[] = {
#define MAX_MCATYPE_NAME_LEN 30
static char buf_mcatype[MAX_MCATYPE_NAME_LEN];
+struct threshold_block {
+ /* This block's number within its bank. */
+ unsigned int block;
+ /* MCA bank number that contains this block. */
+ unsigned int bank;
+ /* CPU which controls this block's MCA bank. */
+ unsigned int cpu;
+ /* MCA_MISC MSR address for this block. */
+ u32 address;
+ /* Enable/Disable APIC interrupt. */
+ bool interrupt_enable;
+ /* Bank can generate an interrupt. */
+ bool interrupt_capable;
+ /* Value upon which threshold interrupt is generated. */
+ u16 threshold_limit;
+ /* sysfs object */
+ struct kobject kobj;
+ /* List of threshold blocks within this block's MCA bank. */
+ struct list_head miscj;
+};
+
+struct threshold_bank {
+ struct kobject *kobj;
+ struct threshold_block *blocks;
+};
+
static DEFINE_PER_CPU(struct threshold_bank **, threshold_banks);
/*
@@ -333,19 +356,6 @@ struct thresh_restart {
u16 old_limit;
};
-static inline bool is_shared_bank(int bank)
-{
- /*
- * Scalable MCA provides for only one core to have access to the MSRs of
- * a shared bank.
- */
- if (mce_flags.smca)
- return false;
-
- /* Bank 4 is for northbridge reporting and is thus shared */
- return (bank == 4);
-}
-
static const char *bank4_names(const struct threshold_block *b)
{
switch (b->address) {
@@ -1198,35 +1208,10 @@ out_free:
return err;
}
-static int __threshold_add_blocks(struct threshold_bank *b)
-{
- struct list_head *head = &b->blocks->miscj;
- struct threshold_block *pos = NULL;
- struct threshold_block *tmp = NULL;
- int err = 0;
-
- err = kobject_add(&b->blocks->kobj, b->kobj, b->blocks->kobj.name);
- if (err)
- return err;
-
- list_for_each_entry_safe(pos, tmp, head, miscj) {
-
- err = kobject_add(&pos->kobj, b->kobj, pos->kobj.name);
- if (err) {
- list_for_each_entry_safe_reverse(pos, tmp, head, miscj)
- kobject_del(&pos->kobj);
-
- return err;
- }
- }
- return err;
-}
-
static int threshold_create_bank(struct threshold_bank **bp, unsigned int cpu,
unsigned int bank)
{
struct device *dev = this_cpu_read(mce_device);
- struct amd_northbridge *nb = NULL;
struct threshold_bank *b = NULL;
const char *name = get_name(cpu, bank, NULL);
int err = 0;
@@ -1234,26 +1219,6 @@ static int threshold_create_bank(struct threshold_bank **bp, unsigned int cpu,
if (!dev)
return -ENODEV;
- if (is_shared_bank(bank)) {
- nb = node_to_amd_nb(topology_amd_node_id(cpu));
-
- /* threshold descriptor already initialized on this node? */
- if (nb && nb->bank4) {
- /* yes, use it */
- b = nb->bank4;
- err = kobject_add(b->kobj, &dev->kobj, name);
- if (err)
- goto out;
-
- bp[bank] = b;
- refcount_inc(&b->cpus);
-
- err = __threshold_add_blocks(b);
-
- goto out;
- }
- }
-
b = kzalloc(sizeof(struct threshold_bank), GFP_KERNEL);
if (!b) {
err = -ENOMEM;
@@ -1267,17 +1232,6 @@ static int threshold_create_bank(struct threshold_bank **bp, unsigned int cpu,
goto out_free;
}
- if (is_shared_bank(bank)) {
- b->shared = 1;
- refcount_set(&b->cpus, 1);
-
- /* nb is already initialized, see above */
- if (nb) {
- WARN_ON(nb->bank4);
- nb->bank4 = b;
- }
- }
-
err = allocate_threshold_blocks(cpu, b, bank, 0, mca_msr_reg(bank, MCA_MISC));
if (err)
goto out_kobj;
@@ -1310,40 +1264,11 @@ static void deallocate_threshold_blocks(struct threshold_bank *bank)
kobject_put(&bank->blocks->kobj);
}
-static void __threshold_remove_blocks(struct threshold_bank *b)
-{
- struct threshold_block *pos = NULL;
- struct threshold_block *tmp = NULL;
-
- kobject_put(b->kobj);
-
- list_for_each_entry_safe(pos, tmp, &b->blocks->miscj, miscj)
- kobject_put(b->kobj);
-}
-
static void threshold_remove_bank(struct threshold_bank *bank)
{
- struct amd_northbridge *nb;
-
if (!bank->blocks)
goto out_free;
- if (!bank->shared)
- goto out_dealloc;
-
- if (!refcount_dec_and_test(&bank->cpus)) {
- __threshold_remove_blocks(bank);
- return;
- } else {
- /*
- * The last CPU on this node using the shared bank is going
- * away, remove that bank now.
- */
- nb = node_to_amd_nb(topology_amd_node_id(smp_processor_id()));
- nb->bank4 = NULL;
- }
-
-out_dealloc:
deallocate_threshold_blocks(bank);
out_free:
generated by cgit (git 2.34.1) at 2025-05-28 17:28:06 +0000