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authorAravind Gopalakrishnan <Aravind.Gopalakrishnan@amd.com>2015-10-12 11:22:40 +0200
committerIngo Molnar <mingo@kernel.org>2015-10-12 16:15:48 +0200
commitfa20a2ed6fff717839ec03b6574ea0affcb58841 (patch)
treec1f69b1194ca74b819f6482a443bfc6d19e55c55 /arch/x86/ras
parenta1300e50529795cd605da6a015d4944a18921db0 (diff)
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x86/ras/mce_amd_inj: Inject bank 4 errors on the NBC
Bank 4 MCEs are logged and reported only on the node base core (NBC) in a socket. Refer to the D18F3x44[NbMcaToMstCpuEn] field in Fam10h and later BKDGs. The node base core (NBC) is the lowest numbered core in the node. This patch ensures that we inject the error on the NBC for bank 4 errors. Otherwise, triggering #MC or APIC interrupts on a core which is not the NBC would not have any effect on the system, i.e. we would not see any relevant output on kernel logs for the error we just injected. Signed-off-by: Aravind Gopalakrishnan <Aravind.Gopalakrishnan@amd.com> [ Cleanup comments. ] [ Add a missing dependency on AMD_NB caught by Randy Dunlap. ] Signed-off-by: Borislav Petkov <bp@suse.de> Acked-by: Randy Dunlap <rdunlap@infradead.org> Cc: Borislav Petkov <bp@alien8.de> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tony Luck <tony.luck@intel.com> Link: http://lkml.kernel.org/r/1443190851-2172-4-git-send-email-Aravind.Gopalakrishnan@amd.com Link: http://lkml.kernel.org/r/1444641762-9437-5-git-send-email-bp@alien8.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/ras')
-rw-r--r--arch/x86/ras/Kconfig4
-rw-r--r--arch/x86/ras/mce_amd_inj.c52
2 files changed, 53 insertions, 3 deletions
diff --git a/arch/x86/ras/Kconfig b/arch/x86/ras/Kconfig
index 10fea5fc821e..df280da34825 100644
--- a/arch/x86/ras/Kconfig
+++ b/arch/x86/ras/Kconfig
@@ -1,11 +1,9 @@
config AMD_MCE_INJ
tristate "Simple MCE injection interface for AMD processors"
- depends on RAS && EDAC_DECODE_MCE && DEBUG_FS
+ depends on RAS && EDAC_DECODE_MCE && DEBUG_FS && AMD_NB
default n
help
This is a simple debugfs interface to inject MCEs and test different
aspects of the MCE handling code.
WARNING: Do not even assume this interface is staying stable!
-
-
diff --git a/arch/x86/ras/mce_amd_inj.c b/arch/x86/ras/mce_amd_inj.c
index 4d3bafb540c2..55d38cfa46c2 100644
--- a/arch/x86/ras/mce_amd_inj.c
+++ b/arch/x86/ras/mce_amd_inj.c
@@ -17,8 +17,10 @@
#include <linux/cpu.h>
#include <linux/string.h>
#include <linux/uaccess.h>
+#include <linux/pci.h>
#include <asm/mce.h>
+#include <asm/amd_nb.h>
#include <asm/irq_vectors.h>
#include "../kernel/cpu/mcheck/mce-internal.h"
@@ -32,6 +34,7 @@ static struct dentry *dfs_inj;
static u8 n_banks;
#define MAX_FLAG_OPT_SIZE 3
+#define NBCFG 0x44
enum injection_type {
SW_INJ = 0, /* SW injection, simply decode the error */
@@ -198,6 +201,45 @@ static void trigger_thr_int(void *info)
asm volatile("int %0" :: "i" (THRESHOLD_APIC_VECTOR));
}
+static u32 get_nbc_for_node(int node_id)
+{
+ struct cpuinfo_x86 *c = &boot_cpu_data;
+ u32 cores_per_node;
+
+ cores_per_node = c->x86_max_cores / amd_get_nodes_per_socket();
+
+ return cores_per_node * node_id;
+}
+
+static void toggle_nb_mca_mst_cpu(u16 nid)
+{
+ struct pci_dev *F3 = node_to_amd_nb(nid)->misc;
+ u32 val;
+ int err;
+
+ if (!F3)
+ return;
+
+ err = pci_read_config_dword(F3, NBCFG, &val);
+ if (err) {
+ pr_err("%s: Error reading F%dx%03x.\n",
+ __func__, PCI_FUNC(F3->devfn), NBCFG);
+ return;
+ }
+
+ if (val & BIT(27))
+ return;
+
+ pr_err("%s: Set D18F3x44[NbMcaToMstCpuEn] which BIOS hasn't done.\n",
+ __func__);
+
+ val |= BIT(27);
+ err = pci_write_config_dword(F3, NBCFG, val);
+ if (err)
+ pr_err("%s: Error writing F%dx%03x.\n",
+ __func__, PCI_FUNC(F3->devfn), NBCFG);
+}
+
static void do_inject(void)
{
u64 mcg_status = 0;
@@ -228,6 +270,16 @@ static void do_inject(void)
i_mce.status |= (i_mce.status & ~MCI_STATUS_UC);
}
+ /*
+ * For multi node CPUs, logging and reporting of bank 4 errors happens
+ * only on the node base core. Refer to D18F3x44[NbMcaToMstCpuEn] for
+ * Fam10h and later BKDGs.
+ */
+ if (static_cpu_has(X86_FEATURE_AMD_DCM) && b == 4) {
+ toggle_nb_mca_mst_cpu(amd_get_nb_id(cpu));
+ cpu = get_nbc_for_node(amd_get_nb_id(cpu));
+ }
+
get_online_cpus();
if (!cpu_online(cpu))
goto err;