[PATCH v3 0/9] Extended H/W error log driver

[PATCH v3 0/9] Extended H/W error log driver

[Chen, Gong]

[PATCH v3 1/9] ACPI, APEI, CPER: Fix status check during error printing
[PATCH v3 2/9] ACPI, CPER: Update cper info
[PATCH v3 3/9] bitops: Introduce a more generic BITMASK macro
[PATCH v3 4/9] ACPI, x86: Extended error log driver for x86 platform
[PATCH v3 5/9] DMI: Parse memory device (type 17) in SMBIOS
[PATCH v3 6/9] ACPI, APEI, CPER: Add UEFI 2.4 support for memory error
[PATCH v3 7/9] ACPI, APEI, CPER: Enhance memory reporting capability
[PATCH v3 8/9] ACPI, APEI, CPER: Cleanup CPER memory error output format
[PATCH v3 9/9] EDAC, GHES: Update ghes error record info

OK, this is the 3rd version. Hope it is the last one :-).

this version just updates some minors places and apply some Ack/Review
information. In this version I remove the last patch for trace interface.
Maybe it is time to build a new RAS trace interface to integrate all
RAS related error report interfaces now.

new output format as below:

dmesg output:

[  498.485536] {1}Hardware error detected on CPU45
[  498.485616] {1}It has been corrected by h/w and requires no further action
[  498.485655] {1}event severity: corrected
[  498.485660] {1} Error 0, type: corrected
[  498.485681] {1}  section_type: memory error
[  498.485686] {1}  physical_address: 0x000000207ff1a000
[  498.485697] {1}  DIMM location: Memriser7 CHANNEL A DIMM 0
[  498.485720] {2}Hardware error detected on CPU45
[  498.485728] {2}It has been corrected by h/w and requires no further action
[  498.485735] {2}event severity: corrected
[  498.485740] {2} Error 0, type: corrected
[  498.485748] {2}  section_type: memory error

[PATCH v3 1/9] ACPI, APEI, CPER: Fix status check during error printing

[Chen, Gong]

Commit aaf9d93 only catches condition check before print,
but the similar check is needed during printing CPER error
sections.

Signed-off-by: Chen, Gong <gong.chen@linux.intel.com>
Reviewed-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
---
 drivers/acpi/apei/cper.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/acpi/apei/cper.c b/drivers/acpi/apei/cper.c
index 33dc6a0..f827f02 100644
--- a/drivers/acpi/apei/cper.c
+++ b/drivers/acpi/apei/cper.c
@@ -353,7 +353,7 @@ void apei_estatus_print(const char *pfx,
 	       cper_severity_str(severity));
 	data_len = estatus->data_length;
 	gdata = (struct acpi_hest_generic_data *)(estatus + 1);
-	while (data_len > sizeof(*gdata)) {
+	while (data_len >= sizeof(*gdata)) {
 		gedata_len = gdata->error_data_length;
 		apei_estatus_print_section(pfx, gdata, sec_no);
 		data_len -= gedata_len + sizeof(*gdata);
-- 
1.8.4.rc3

[PATCH v3 2/9] ACPI, CPER: Update cper info

[Chen, Gong]

To prepare for the following patches and make related
definition more clear, update some definitions about CPER.

v2 -> v1: Update some more definitions suggested by Boris

Signed-off-by: Chen, Gong <gong.chen@linux.intel.com>
Acked-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
---
 drivers/acpi/apei/apei-internal.h | 12 ++++----
 drivers/acpi/apei/cper.c          | 58 +++++++++++++++++++--------------------
 drivers/acpi/apei/ghes.c          | 54 ++++++++++++++++++------------------
 include/acpi/actbl1.h             | 14 +++++-----
 include/acpi/ghes.h               |  2 +-
 include/linux/cper.h              |  2 +-
 6 files changed, 71 insertions(+), 71 deletions(-)

diff --git a/drivers/acpi/apei/apei-internal.h b/drivers/acpi/apei/apei-internal.h
index f220d64..21ba34a 100644
--- a/drivers/acpi/apei/apei-internal.h
+++ b/drivers/acpi/apei/apei-internal.h
@@ -122,11 +122,11 @@ struct dentry;
 struct dentry *apei_get_debugfs_dir(void);
 
 #define apei_estatus_for_each_section(estatus, section)			\
-	for (section = (struct acpi_hest_generic_data *)(estatus + 1);	\
+	for (section = (struct acpi_generic_data *)(estatus + 1);	\
 	     (void *)section - (void *)estatus < estatus->data_length;	\
 	     section = (void *)(section+1) + section->error_data_length)
 
-static inline u32 apei_estatus_len(struct acpi_hest_generic_status *estatus)
+static inline u32 cper_estatus_len(struct acpi_generic_status *estatus)
 {
 	if (estatus->raw_data_length)
 		return estatus->raw_data_offset + \
@@ -135,10 +135,10 @@ static inline u32 apei_estatus_len(struct acpi_hest_generic_status *estatus)
 		return sizeof(*estatus) + estatus->data_length;
 }
 
-void apei_estatus_print(const char *pfx,
-			const struct acpi_hest_generic_status *estatus);
-int apei_estatus_check_header(const struct acpi_hest_generic_status *estatus);
-int apei_estatus_check(const struct acpi_hest_generic_status *estatus);
+void cper_estatus_print(const char *pfx,
+			const struct acpi_generic_status *estatus);
+int cper_estatus_check_header(const struct acpi_generic_status *estatus);
+int cper_estatus_check(const struct acpi_generic_status *estatus);
 
 int apei_osc_setup(void);
 #endif
diff --git a/drivers/acpi/apei/cper.c b/drivers/acpi/apei/cper.c
index f827f02..eb5f6d6 100644
--- a/drivers/acpi/apei/cper.c
+++ b/drivers/acpi/apei/cper.c
@@ -5,7 +5,7 @@
  *	Author: Huang Ying <ying.huang@intel.com>
  *
  * CPER is the format used to describe platform hardware error by
- * various APEI tables, such as ERST, BERT and HEST etc.
+ * various tables, such as ERST, BERT and HEST etc.
  *
  * For more information about CPER, please refer to Appendix N of UEFI
  * Specification version 2.3.
@@ -73,7 +73,7 @@ static const char *cper_severity_str(unsigned int severity)
  * printed, with @pfx is printed at the beginning of each line.
  */
 void cper_print_bits(const char *pfx, unsigned int bits,
-		     const char *strs[], unsigned int strs_size)
+		     const char * const strs[], unsigned int strs_size)
 {
 	int i, len = 0;
 	const char *str;
@@ -98,32 +98,32 @@ void cper_print_bits(const char *pfx, unsigned int bits,
 		printk("%s\n", buf);
 }
 
-static const char *cper_proc_type_strs[] = {
+static const char * const cper_proc_type_strs[] = {
 	"IA32/X64",
 	"IA64",
 };
 
-static const char *cper_proc_isa_strs[] = {
+static const char * const cper_proc_isa_strs[] = {
 	"IA32",
 	"IA64",
 	"X64",
 };
 
-static const char *cper_proc_error_type_strs[] = {
+static const char * const cper_proc_error_type_strs[] = {
 	"cache error",
 	"TLB error",
 	"bus error",
 	"micro-architectural error",
 };
 
-static const char *cper_proc_op_strs[] = {
+static const char * const cper_proc_op_strs[] = {
 	"unknown or generic",
 	"data read",
 	"data write",
 	"instruction execution",
 };
 
-static const char *cper_proc_flag_strs[] = {
+static const char * const cper_proc_flag_strs[] = {
 	"restartable",
 	"precise IP",
 	"overflow",
@@ -248,7 +248,7 @@ static const char *cper_pcie_port_type_strs[] = {
 };
 
 static void cper_print_pcie(const char *pfx, const struct cper_sec_pcie *pcie,
-			    const struct acpi_hest_generic_data *gdata)
+			    const struct acpi_generic_data *gdata)
 {
 	if (pcie->validation_bits & CPER_PCIE_VALID_PORT_TYPE)
 		printk("%s""port_type: %d, %s\n", pfx, pcie->port_type,
@@ -283,17 +283,17 @@ static void cper_print_pcie(const char *pfx, const struct cper_sec_pcie *pcie,
 	pfx, pcie->bridge.secondary_status, pcie->bridge.control);
 }
 
-static const char *apei_estatus_section_flag_strs[] = {
+static const char * const cper_estatus_section_flag_strs[] = {
 	"primary",
 	"containment warning",
 	"reset",
-	"threshold exceeded",
+	"error threshold exceeded",
 	"resource not accessible",
 	"latent error",
 };
 
-static void apei_estatus_print_section(
-	const char *pfx, const struct acpi_hest_generic_data *gdata, int sec_no)
+static void cper_estatus_print_section(
+	const char *pfx, const struct acpi_generic_data *gdata, int sec_no)
 {
 	uuid_le *sec_type = (uuid_le *)gdata->section_type;
 	__u16 severity;
@@ -302,8 +302,8 @@ static void apei_estatus_print_section(
 	printk("%s""section: %d, severity: %d, %s\n", pfx, sec_no, severity,
 	       cper_severity_str(severity));
 	printk("%s""flags: 0x%02x\n", pfx, gdata->flags);
-	cper_print_bits(pfx, gdata->flags, apei_estatus_section_flag_strs,
-			ARRAY_SIZE(apei_estatus_section_flag_strs));
+	cper_print_bits(pfx, gdata->flags, cper_estatus_section_flag_strs,
+			ARRAY_SIZE(cper_estatus_section_flag_strs));
 	if (gdata->validation_bits & CPER_SEC_VALID_FRU_ID)
 		printk("%s""fru_id: %pUl\n", pfx, (uuid_le *)gdata->fru_id);
 	if (gdata->validation_bits & CPER_SEC_VALID_FRU_TEXT)
@@ -339,34 +339,34 @@ err_section_too_small:
 	pr_err(FW_WARN "error section length is too small\n");
 }
 
-void apei_estatus_print(const char *pfx,
-			const struct acpi_hest_generic_status *estatus)
+void cper_estatus_print(const char *pfx,
+			const struct acpi_generic_status *estatus)
 {
-	struct acpi_hest_generic_data *gdata;
+	struct acpi_generic_data *gdata;
 	unsigned int data_len, gedata_len;
 	int sec_no = 0;
 	__u16 severity;
 
-	printk("%s""APEI generic hardware error status\n", pfx);
+	printk("%s""Generic Hardware Error Status\n", pfx);
 	severity = estatus->error_severity;
 	printk("%s""severity: %d, %s\n", pfx, severity,
 	       cper_severity_str(severity));
 	data_len = estatus->data_length;
-	gdata = (struct acpi_hest_generic_data *)(estatus + 1);
+	gdata = (struct acpi_generic_data *)(estatus + 1);
 	while (data_len >= sizeof(*gdata)) {
 		gedata_len = gdata->error_data_length;
-		apei_estatus_print_section(pfx, gdata, sec_no);
+		cper_estatus_print_section(pfx, gdata, sec_no);
 		data_len -= gedata_len + sizeof(*gdata);
 		gdata = (void *)(gdata + 1) + gedata_len;
 		sec_no++;
 	}
 }
-EXPORT_SYMBOL_GPL(apei_estatus_print);
+EXPORT_SYMBOL_GPL(cper_estatus_print);
 
-int apei_estatus_check_header(const struct acpi_hest_generic_status *estatus)
+int cper_estatus_check_header(const struct acpi_generic_status *estatus)
 {
 	if (estatus->data_length &&
-	    estatus->data_length < sizeof(struct acpi_hest_generic_data))
+	    estatus->data_length < sizeof(struct acpi_generic_data))
 		return -EINVAL;
 	if (estatus->raw_data_length &&
 	    estatus->raw_data_offset < sizeof(*estatus) + estatus->data_length)
@@ -374,19 +374,19 @@ int apei_estatus_check_header(const struct acpi_hest_generic_status *estatus)
 
 	return 0;
 }
-EXPORT_SYMBOL_GPL(apei_estatus_check_header);
+EXPORT_SYMBOL_GPL(cper_estatus_check_header);
 
-int apei_estatus_check(const struct acpi_hest_generic_status *estatus)
+int cper_estatus_check(const struct acpi_generic_status *estatus)
 {
-	struct acpi_hest_generic_data *gdata;
+	struct acpi_generic_data *gdata;
 	unsigned int data_len, gedata_len;
 	int rc;
 
-	rc = apei_estatus_check_header(estatus);
+	rc = cper_estatus_check_header(estatus);
 	if (rc)
 		return rc;
 	data_len = estatus->data_length;
-	gdata = (struct acpi_hest_generic_data *)(estatus + 1);
+	gdata = (struct acpi_generic_data *)(estatus + 1);
 	while (data_len >= sizeof(*gdata)) {
 		gedata_len = gdata->error_data_length;
 		if (gedata_len > data_len - sizeof(*gdata))
@@ -399,4 +399,4 @@ int apei_estatus_check(const struct acpi_hest_generic_status *estatus)
 
 	return 0;
 }
-EXPORT_SYMBOL_GPL(apei_estatus_check);
+EXPORT_SYMBOL_GPL(cper_estatus_check);
diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index 8ec37bb..0db6e4f 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -75,13 +75,13 @@
 #define GHES_ESTATUS_CACHE_LEN(estatus_len)			\
 	(sizeof(struct ghes_estatus_cache) + (estatus_len))
 #define GHES_ESTATUS_FROM_CACHE(estatus_cache)			\
-	((struct acpi_hest_generic_status *)			\
+	((struct acpi_generic_status *)				\
 	 ((struct ghes_estatus_cache *)(estatus_cache) + 1))
 
 #define GHES_ESTATUS_NODE_LEN(estatus_len)			\
 	(sizeof(struct ghes_estatus_node) + (estatus_len))
-#define GHES_ESTATUS_FROM_NODE(estatus_node)				\
-	((struct acpi_hest_generic_status *)				\
+#define GHES_ESTATUS_FROM_NODE(estatus_node)			\
+	((struct acpi_generic_status *)				\
 	 ((struct ghes_estatus_node *)(estatus_node) + 1))
 
 bool ghes_disable;
@@ -378,17 +378,17 @@ static int ghes_read_estatus(struct ghes *ghes, int silent)
 	ghes->flags |= GHES_TO_CLEAR;
 
 	rc = -EIO;
-	len = apei_estatus_len(ghes->estatus);
+	len = cper_estatus_len(ghes->estatus);
 	if (len < sizeof(*ghes->estatus))
 		goto err_read_block;
 	if (len > ghes->generic->error_block_length)
 		goto err_read_block;
-	if (apei_estatus_check_header(ghes->estatus))
+	if (cper_estatus_check_header(ghes->estatus))
 		goto err_read_block;
 	ghes_copy_tofrom_phys(ghes->estatus + 1,
 			      buf_paddr + sizeof(*ghes->estatus),
 			      len - sizeof(*ghes->estatus), 1);
-	if (apei_estatus_check(ghes->estatus))
+	if (cper_estatus_check(ghes->estatus))
 		goto err_read_block;
 	rc = 0;
 
@@ -409,7 +409,7 @@ static void ghes_clear_estatus(struct ghes *ghes)
 	ghes->flags &= ~GHES_TO_CLEAR;
 }
 
-static void ghes_handle_memory_failure(struct acpi_hest_generic_data *gdata, int sev)
+static void ghes_handle_memory_failure(struct acpi_generic_data *gdata, int sev)
 {
 #ifdef CONFIG_ACPI_APEI_MEMORY_FAILURE
 	unsigned long pfn;
@@ -438,10 +438,10 @@ static void ghes_handle_memory_failure(struct acpi_hest_generic_data *gdata, int
 }
 
 static void ghes_do_proc(struct ghes *ghes,
-			 const struct acpi_hest_generic_status *estatus)
+			 const struct acpi_generic_status *estatus)
 {
 	int sev, sec_sev;
-	struct acpi_hest_generic_data *gdata;
+	struct acpi_generic_data *gdata;
 
 	sev = ghes_severity(estatus->error_severity);
 	apei_estatus_for_each_section(estatus, gdata) {
@@ -496,7 +496,7 @@ static void ghes_do_proc(struct ghes *ghes,
 
 static void __ghes_print_estatus(const char *pfx,
 				 const struct acpi_hest_generic *generic,
-				 const struct acpi_hest_generic_status *estatus)
+				 const struct acpi_generic_status *estatus)
 {
 	static atomic_t seqno;
 	unsigned int curr_seqno;
@@ -513,12 +513,12 @@ static void __ghes_print_estatus(const char *pfx,
 	snprintf(pfx_seq, sizeof(pfx_seq), "%s{%u}" HW_ERR, pfx, curr_seqno);
 	printk("%s""Hardware error from APEI Generic Hardware Error Source: %d\n",
 	       pfx_seq, generic->header.source_id);
-	apei_estatus_print(pfx_seq, estatus);
+	cper_estatus_print(pfx_seq, estatus);
 }
 
 static int ghes_print_estatus(const char *pfx,
 			      const struct acpi_hest_generic *generic,
-			      const struct acpi_hest_generic_status *estatus)
+			      const struct acpi_generic_status *estatus)
 {
 	/* Not more than 2 messages every 5 seconds */
 	static DEFINE_RATELIMIT_STATE(ratelimit_corrected, 5*HZ, 2);
@@ -540,15 +540,15 @@ static int ghes_print_estatus(const char *pfx,
  * GHES error status reporting throttle, to report more kinds of
  * errors, instead of just most frequently occurred errors.
  */
-static int ghes_estatus_cached(struct acpi_hest_generic_status *estatus)
+static int ghes_estatus_cached(struct acpi_generic_status *estatus)
 {
 	u32 len;
 	int i, cached = 0;
 	unsigned long long now;
 	struct ghes_estatus_cache *cache;
-	struct acpi_hest_generic_status *cache_estatus;
+	struct acpi_generic_status *cache_estatus;
 
-	len = apei_estatus_len(estatus);
+	len = cper_estatus_len(estatus);
 	rcu_read_lock();
 	for (i = 0; i < GHES_ESTATUS_CACHES_SIZE; i++) {
 		cache = rcu_dereference(ghes_estatus_caches[i]);
@@ -571,19 +571,19 @@ static int ghes_estatus_cached(struct acpi_hest_generic_status *estatus)
 
 static struct ghes_estatus_cache *ghes_estatus_cache_alloc(
 	struct acpi_hest_generic *generic,
-	struct acpi_hest_generic_status *estatus)
+	struct acpi_generic_status *estatus)
 {
 	int alloced;
 	u32 len, cache_len;
 	struct ghes_estatus_cache *cache;
-	struct acpi_hest_generic_status *cache_estatus;
+	struct acpi_generic_status *cache_estatus;
 
 	alloced = atomic_add_return(1, &ghes_estatus_cache_alloced);
 	if (alloced > GHES_ESTATUS_CACHE_ALLOCED_MAX) {
 		atomic_dec(&ghes_estatus_cache_alloced);
 		return NULL;
 	}
-	len = apei_estatus_len(estatus);
+	len = cper_estatus_len(estatus);
 	cache_len = GHES_ESTATUS_CACHE_LEN(len);
 	cache = (void *)gen_pool_alloc(ghes_estatus_pool, cache_len);
 	if (!cache) {
@@ -603,7 +603,7 @@ static void ghes_estatus_cache_free(struct ghes_estatus_cache *cache)
 {
 	u32 len;
 
-	len = apei_estatus_len(GHES_ESTATUS_FROM_CACHE(cache));
+	len = cper_estatus_len(GHES_ESTATUS_FROM_CACHE(cache));
 	len = GHES_ESTATUS_CACHE_LEN(len);
 	gen_pool_free(ghes_estatus_pool, (unsigned long)cache, len);
 	atomic_dec(&ghes_estatus_cache_alloced);
@@ -619,7 +619,7 @@ static void ghes_estatus_cache_rcu_free(struct rcu_head *head)
 
 static void ghes_estatus_cache_add(
 	struct acpi_hest_generic *generic,
-	struct acpi_hest_generic_status *estatus)
+	struct acpi_generic_status *estatus)
 {
 	int i, slot = -1, count;
 	unsigned long long now, duration, period, max_period = 0;
@@ -751,7 +751,7 @@ static void ghes_proc_in_irq(struct irq_work *irq_work)
 	struct llist_node *llnode, *next;
 	struct ghes_estatus_node *estatus_node;
 	struct acpi_hest_generic *generic;
-	struct acpi_hest_generic_status *estatus;
+	struct acpi_generic_status *estatus;
 	u32 len, node_len;
 
 	llnode = llist_del_all(&ghes_estatus_llist);
@@ -765,7 +765,7 @@ static void ghes_proc_in_irq(struct irq_work *irq_work)
 		estatus_node = llist_entry(llnode, struct ghes_estatus_node,
 					   llnode);
 		estatus = GHES_ESTATUS_FROM_NODE(estatus_node);
-		len = apei_estatus_len(estatus);
+		len = cper_estatus_len(estatus);
 		node_len = GHES_ESTATUS_NODE_LEN(len);
 		ghes_do_proc(estatus_node->ghes, estatus);
 		if (!ghes_estatus_cached(estatus)) {
@@ -784,7 +784,7 @@ static void ghes_print_queued_estatus(void)
 	struct llist_node *llnode;
 	struct ghes_estatus_node *estatus_node;
 	struct acpi_hest_generic *generic;
-	struct acpi_hest_generic_status *estatus;
+	struct acpi_generic_status *estatus;
 	u32 len, node_len;
 
 	llnode = llist_del_all(&ghes_estatus_llist);
@@ -797,7 +797,7 @@ static void ghes_print_queued_estatus(void)
 		estatus_node = llist_entry(llnode, struct ghes_estatus_node,
 					   llnode);
 		estatus = GHES_ESTATUS_FROM_NODE(estatus_node);
-		len = apei_estatus_len(estatus);
+		len = cper_estatus_len(estatus);
 		node_len = GHES_ESTATUS_NODE_LEN(len);
 		generic = estatus_node->generic;
 		ghes_print_estatus(NULL, generic, estatus);
@@ -843,7 +843,7 @@ static int ghes_notify_nmi(unsigned int cmd, struct pt_regs *regs)
 #ifdef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG
 		u32 len, node_len;
 		struct ghes_estatus_node *estatus_node;
-		struct acpi_hest_generic_status *estatus;
+		struct acpi_generic_status *estatus;
 #endif
 		if (!(ghes->flags & GHES_TO_CLEAR))
 			continue;
@@ -851,7 +851,7 @@ static int ghes_notify_nmi(unsigned int cmd, struct pt_regs *regs)
 		if (ghes_estatus_cached(ghes->estatus))
 			goto next;
 		/* Save estatus for further processing in IRQ context */
-		len = apei_estatus_len(ghes->estatus);
+		len = cper_estatus_len(ghes->estatus);
 		node_len = GHES_ESTATUS_NODE_LEN(len);
 		estatus_node = (void *)gen_pool_alloc(ghes_estatus_pool,
 						      node_len);
@@ -923,7 +923,7 @@ static int ghes_probe(struct platform_device *ghes_dev)
 
 	rc = -EIO;
 	if (generic->error_block_length <
-	    sizeof(struct acpi_hest_generic_status)) {
+	    sizeof(struct acpi_generic_status)) {
 		pr_warning(FW_BUG GHES_PFX "Invalid error block length: %u for generic hardware error source: %d\n",
 			   generic->error_block_length,
 			   generic->header.source_id);
diff --git a/include/acpi/actbl1.h b/include/acpi/actbl1.h
index 0bd750e..556c83ee 100644
--- a/include/acpi/actbl1.h
+++ b/include/acpi/actbl1.h
@@ -596,7 +596,7 @@ struct acpi_hest_generic {
 
 /* Generic Error Status block */
 
-struct acpi_hest_generic_status {
+struct acpi_generic_status {
 	u32 block_status;
 	u32 raw_data_offset;
 	u32 raw_data_length;
@@ -606,15 +606,15 @@ struct acpi_hest_generic_status {
 
 /* Values for block_status flags above */
 
-#define ACPI_HEST_UNCORRECTABLE             (1)
-#define ACPI_HEST_CORRECTABLE               (1<<1)
-#define ACPI_HEST_MULTIPLE_UNCORRECTABLE    (1<<2)
-#define ACPI_HEST_MULTIPLE_CORRECTABLE      (1<<3)
-#define ACPI_HEST_ERROR_ENTRY_COUNT         (0xFF<<4)	/* 8 bits, error count */
+#define ACPI_GEN_ERR_UC			BIT(0)
+#define ACPI_GEN_ERR_CE			BIT(1)
+#define ACPI_GEN_ERR_MULTI_UC		BIT(2)
+#define ACPI_GEN_ERR_MULTI_CE		BIT(3)
+#define ACPI_GEN_ERR_COUNT_SHIFT	(0xFF<<4) /* 8 bits, error count */
 
 /* Generic Error Data entry */
 
-struct acpi_hest_generic_data {
+struct acpi_generic_data {
 	u8 section_type[16];
 	u32 error_severity;
 	u16 revision;
diff --git a/include/acpi/ghes.h b/include/acpi/ghes.h
index 720446c..dfd60d0 100644
--- a/include/acpi/ghes.h
+++ b/include/acpi/ghes.h
@@ -14,7 +14,7 @@
 
 struct ghes {
 	struct acpi_hest_generic *generic;
-	struct acpi_hest_generic_status *estatus;
+	struct acpi_generic_status *estatus;
 	u64 buffer_paddr;
 	unsigned long flags;
 	union {
diff --git a/include/linux/cper.h b/include/linux/cper.h
index c230494..09ebe21 100644
--- a/include/linux/cper.h
+++ b/include/linux/cper.h
@@ -389,6 +389,6 @@ struct cper_sec_pcie {
 
 u64 cper_next_record_id(void);
 void cper_print_bits(const char *prefix, unsigned int bits,
-		     const char *strs[], unsigned int strs_size);
+		     const char * const strs[], unsigned int strs_size);
 
 #endif
-- 
1.8.4.rc3

[PATCH v3 3/9] bitops: Introduce a more generic BITMASK macro

[Chen, Gong]

GENMASK is used to create a contiguous bitmask([hi:lo]). It is
implemented twice in current kernel. One is in EDAC driver, the other
is in SiS/XGI FB driver. Move it to a more generic place for other
usage.

Signed-off-by: Chen, Gong <gong.chen@linux.intel.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Thomas Winischhofer <thomas@winischhofer.net>
Cc: Jean-Christophe Plagniol-Villard <plagnioj@jcrosoft.com>
Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
Acked-by: Borislav Petkov <bp@suse.de>
Acked-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
---
 drivers/edac/amd64_edac.c | 46 ++++++++++++++++++++++++----------------------
 drivers/edac/amd64_edac.h |  8 --------
 drivers/edac/sb_edac.c    |  2 +-
 drivers/video/sis/init.c  |  5 ++---
 include/linux/bitops.h    |  8 ++++++++
 5 files changed, 35 insertions(+), 34 deletions(-)

diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index 3c9e4e9..b53d0de 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -339,8 +339,8 @@ static void get_cs_base_and_mask(struct amd64_pvt *pvt, int csrow, u8 dct,
 	if (pvt->fam == 0xf && pvt->ext_model < K8_REV_F) {
 		csbase		= pvt->csels[dct].csbases[csrow];
 		csmask		= pvt->csels[dct].csmasks[csrow];
-		base_bits	= GENMASK(21, 31) | GENMASK(9, 15);
-		mask_bits	= GENMASK(21, 29) | GENMASK(9, 15);
+		base_bits	= GENMASK_ULL(31, 21) | GENMASK_ULL(15, 9);
+		mask_bits	= GENMASK_ULL(29, 21) | GENMASK_ULL(15, 9);
 		addr_shift	= 4;
 
 	/*
@@ -352,16 +352,16 @@ static void get_cs_base_and_mask(struct amd64_pvt *pvt, int csrow, u8 dct,
 		csbase          = pvt->csels[dct].csbases[csrow];
 		csmask          = pvt->csels[dct].csmasks[csrow >> 1];
 
-		*base  = (csbase & GENMASK(5,  15)) << 6;
-		*base |= (csbase & GENMASK(19, 30)) << 8;
+		*base  = (csbase & GENMASK_ULL(15,  5)) << 6;
+		*base |= (csbase & GENMASK_ULL(30, 19)) << 8;
 
 		*mask = ~0ULL;
 		/* poke holes for the csmask */
-		*mask &= ~((GENMASK(5, 15)  << 6) |
-			   (GENMASK(19, 30) << 8));
+		*mask &= ~((GENMASK_ULL(15, 5)  << 6) |
+			   (GENMASK_ULL(30, 19) << 8));
 
-		*mask |= (csmask & GENMASK(5, 15))  << 6;
-		*mask |= (csmask & GENMASK(19, 30)) << 8;
+		*mask |= (csmask & GENMASK_ULL(15, 5))  << 6;
+		*mask |= (csmask & GENMASK_ULL(30, 19)) << 8;
 
 		return;
 	} else {
@@ -370,9 +370,11 @@ static void get_cs_base_and_mask(struct amd64_pvt *pvt, int csrow, u8 dct,
 		addr_shift	= 8;
 
 		if (pvt->fam == 0x15)
-			base_bits = mask_bits = GENMASK(19,30) | GENMASK(5,13);
+			base_bits = mask_bits =
+				GENMASK_ULL(30,19) | GENMASK_ULL(13,5);
 		else
-			base_bits = mask_bits = GENMASK(19,28) | GENMASK(5,13);
+			base_bits = mask_bits =
+				GENMASK_ULL(28,19) | GENMASK_ULL(13,5);
 	}
 
 	*base  = (csbase & base_bits) << addr_shift;
@@ -561,7 +563,7 @@ static u64 sys_addr_to_dram_addr(struct mem_ctl_info *mci, u64 sys_addr)
 	 * section 3.4.2 of AMD publication 24592: AMD x86-64 Architecture
 	 * Programmer's Manual Volume 1 Application Programming.
 	 */
-	dram_addr = (sys_addr & GENMASK(0, 39)) - dram_base;
+	dram_addr = (sys_addr & GENMASK_ULL(39, 0)) - dram_base;
 
 	edac_dbg(2, "using DRAM Base register to translate SysAddr 0x%lx to DramAddr 0x%lx\n",
 		 (unsigned long)sys_addr, (unsigned long)dram_addr);
@@ -597,7 +599,7 @@ static u64 dram_addr_to_input_addr(struct mem_ctl_info *mci, u64 dram_addr)
 	 * concerning translating a DramAddr to an InputAddr.
 	 */
 	intlv_shift = num_node_interleave_bits(dram_intlv_en(pvt, 0));
-	input_addr = ((dram_addr >> intlv_shift) & GENMASK(12, 35)) +
+	input_addr = ((dram_addr >> intlv_shift) & GENMASK_ULL(35, 12)) +
 		      (dram_addr & 0xfff);
 
 	edac_dbg(2, "  Intlv Shift=%d DramAddr=0x%lx maps to InputAddr=0x%lx\n",
@@ -849,7 +851,7 @@ static u64 get_error_address(struct amd64_pvt *pvt, struct mce *m)
 		end_bit   = 39;
 	}
 
-	addr = m->addr & GENMASK(start_bit, end_bit);
+	addr = m->addr & GENMASK_ULL(end_bit, start_bit);
 
 	/*
 	 * Erratum 637 workaround
@@ -861,7 +863,7 @@ static u64 get_error_address(struct amd64_pvt *pvt, struct mce *m)
 		u16 mce_nid;
 		u8 intlv_en;
 
-		if ((addr & GENMASK(24, 47)) >> 24 != 0x00fdf7)
+		if ((addr & GENMASK_ULL(47, 24)) >> 24 != 0x00fdf7)
 			return addr;
 
 		mce_nid	= amd_get_nb_id(m->extcpu);
@@ -871,7 +873,7 @@ static u64 get_error_address(struct amd64_pvt *pvt, struct mce *m)
 		intlv_en = tmp >> 21 & 0x7;
 
 		/* add [47:27] + 3 trailing bits */
-		cc6_base  = (tmp & GENMASK(0, 20)) << 3;
+		cc6_base  = (tmp & GENMASK_ULL(20, 0)) << 3;
 
 		/* reverse and add DramIntlvEn */
 		cc6_base |= intlv_en ^ 0x7;
@@ -880,18 +882,18 @@ static u64 get_error_address(struct amd64_pvt *pvt, struct mce *m)
 		cc6_base <<= 24;
 
 		if (!intlv_en)
-			return cc6_base | (addr & GENMASK(0, 23));
+			return cc6_base | (addr & GENMASK_ULL(23, 0));
 
 		amd64_read_pci_cfg(pvt->F1, DRAM_LOCAL_NODE_BASE, &tmp);
 
 							/* faster log2 */
-		tmp_addr  = (addr & GENMASK(12, 23)) << __fls(intlv_en + 1);
+		tmp_addr  = (addr & GENMASK_ULL(23, 12)) << __fls(intlv_en + 1);
 
 		/* OR DramIntlvSel into bits [14:12] */
-		tmp_addr |= (tmp & GENMASK(21, 23)) >> 9;
+		tmp_addr |= (tmp & GENMASK_ULL(23, 21)) >> 9;
 
 		/* add remaining [11:0] bits from original MC4_ADDR */
-		tmp_addr |= addr & GENMASK(0, 11);
+		tmp_addr |= addr & GENMASK_ULL(11, 0);
 
 		return cc6_base | tmp_addr;
 	}
@@ -952,12 +954,12 @@ static void read_dram_base_limit_regs(struct amd64_pvt *pvt, unsigned range)
 
 	amd64_read_pci_cfg(f1, DRAM_LOCAL_NODE_LIM, &llim);
 
-	pvt->ranges[range].lim.lo &= GENMASK(0, 15);
+	pvt->ranges[range].lim.lo &= GENMASK_ULL(15, 0);
 
 				    /* {[39:27],111b} */
 	pvt->ranges[range].lim.lo |= ((llim & 0x1fff) << 3 | 0x7) << 16;
 
-	pvt->ranges[range].lim.hi &= GENMASK(0, 7);
+	pvt->ranges[range].lim.hi &= GENMASK_ULL(7, 0);
 
 				    /* [47:40] */
 	pvt->ranges[range].lim.hi |= llim >> 13;
@@ -1330,7 +1332,7 @@ static u64 f1x_get_norm_dct_addr(struct amd64_pvt *pvt, u8 range,
 			chan_off = dram_base;
 	}
 
-	return (sys_addr & GENMASK(6,47)) - (chan_off & GENMASK(23,47));
+	return (sys_addr & GENMASK_ULL(47,6)) - (chan_off & GENMASK_ULL(47,23));
 }
 
 /*
diff --git a/drivers/edac/amd64_edac.h b/drivers/edac/amd64_edac.h
index d2443cf..6dc1fcc 100644
--- a/drivers/edac/amd64_edac.h
+++ b/drivers/edac/amd64_edac.h
@@ -160,14 +160,6 @@
 #define OFF false
 
 /*
- * Create a contiguous bitmask starting at bit position @lo and ending at
- * position @hi. For example
- *
- * GENMASK(21, 39) gives us the 64bit vector 0x000000ffffe00000.
- */
-#define GENMASK(lo, hi)			(((1ULL << ((hi) - (lo) + 1)) - 1) << (lo))
-
-/*
  * PCI-defined configuration space registers
  */
 #define PCI_DEVICE_ID_AMD_15H_M30H_NB_F1 0x141b
diff --git a/drivers/edac/sb_edac.c b/drivers/edac/sb_edac.c
index e04462b..88f60c5 100644
--- a/drivers/edac/sb_edac.c
+++ b/drivers/edac/sb_edac.c
@@ -50,7 +50,7 @@ static int probed;
  * Get a bit field at register value <v>, from bit <lo> to bit <hi>
  */
 #define GET_BITFIELD(v, lo, hi)	\
-	(((v) & ((1ULL << ((hi) - (lo) + 1)) - 1) << (lo)) >> (lo))
+	(((v) & GENMASK_ULL(hi, lo)) >> (lo))
 
 /*
  * sbridge Memory Controller Registers
diff --git a/drivers/video/sis/init.c b/drivers/video/sis/init.c
index f082ae5..4f26bc2 100644
--- a/drivers/video/sis/init.c
+++ b/drivers/video/sis/init.c
@@ -3320,9 +3320,8 @@ SiSSetMode(struct SiS_Private *SiS_Pr, unsigned short ModeNo)
 }
 
 #ifndef GETBITSTR
-#define BITMASK(h,l)    	(((unsigned)(1U << ((h)-(l)+1))-1)<<(l))
-#define GENMASK(mask)   	BITMASK(1?mask,0?mask)
-#define GETBITS(var,mask)   	(((var) & GENMASK(mask)) >> (0?mask))
+#define GENBITSMASK(mask)   	GENMASK(1?mask,0?mask)
+#define GETBITS(var,mask)   	(((var) & GENBITSMASK(mask)) >> (0?mask))
 #define GETBITSTR(val,from,to)  ((GETBITS(val,from)) << (0?to))
 #endif
 
diff --git a/include/linux/bitops.h b/include/linux/bitops.h
index a3b6b82..bd0c459 100644
--- a/include/linux/bitops.h
+++ b/include/linux/bitops.h
@@ -10,6 +10,14 @@
 #define BITS_TO_LONGS(nr)	DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long))
 #endif
 
+/*
+ * Create a contiguous bitmask starting at bit position @l and ending at
+ * position @h. For example
+ * GENMASK_ULL(39, 21) gives us the 64bit vector 0x000000ffffe00000.
+ */
+#define GENMASK(h, l)		(((U32_C(1) << ((h) - (l) + 1)) - 1) << (l))
+#define GENMASK_ULL(h, l)	(((U64_C(1) << ((h) - (l) + 1)) - 1) << (l))
+
 extern unsigned int __sw_hweight8(unsigned int w);
 extern unsigned int __sw_hweight16(unsigned int w);
 extern unsigned int __sw_hweight32(unsigned int w);
-- 
1.8.4.rc3

[PATCH v3 4/9] ACPI, x86: Extended error log driver for x86 platform

[Chen, Gong]

This H/W error log driver (a.k.a eMCA driver) is implemented based on
http://www.intel.com/content/www/us/en/architecture-and-technology/enhanced-mca-logging-xeon-paper.html

After errors are captured, more valuable information can be
got via this new enhanced H/W error log driver.

v3 -> v2: fix a MACRO definition error and some cleanup
v2 -> v1: eliminate spin_lock & minor fixes suggested by Boris

Signed-off-by: Chen, Gong <gong.chen@linux.intel.com>
---
 arch/x86/include/asm/mce.h       |   5 +
 arch/x86/kernel/cpu/mcheck/mce.c |  20 +++
 drivers/acpi/Kconfig             |  20 +++
 drivers/acpi/Makefile            |   2 +
 drivers/acpi/acpi_extlog.c       | 319 +++++++++++++++++++++++++++++++++++++++
 drivers/acpi/bus.c               |   3 +-
 include/linux/acpi.h             |   1 +
 7 files changed, 369 insertions(+), 1 deletion(-)
 create mode 100644 drivers/acpi/acpi_extlog.c

diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h
index cbe6b9e..072b2f8 100644
--- a/arch/x86/include/asm/mce.h
+++ b/arch/x86/include/asm/mce.h
@@ -16,6 +16,7 @@
 #define MCG_EXT_CNT_SHIFT	16
 #define MCG_EXT_CNT(c)		(((c) & MCG_EXT_CNT_MASK) >> MCG_EXT_CNT_SHIFT)
 #define MCG_SER_P		(1ULL<<24)   /* MCA recovery/new status bits */
+#define MCG_ELOG_P		(1ULL<<26)   /* Extended error log supported */
 
 /* MCG_STATUS register defines */
 #define MCG_STATUS_RIPV  (1ULL<<0)   /* restart ip valid */
@@ -186,6 +187,10 @@ enum mcp_flags {
 	MCP_UC = (1 << 1),		/* log uncorrected errors */
 	MCP_DONTLOG = (1 << 2),		/* only clear, don't log */
 };
+
+void register_elog_handler(int (*f)(const char *, int, int));
+void unregister_elog_handler(int (*f)(const char *, int, int));
+
 void machine_check_poll(enum mcp_flags flags, mce_banks_t *b);
 
 int mce_notify_irq(void);
diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index b3218cd..981e0d3 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -48,6 +48,8 @@
 
 #include "mce-internal.h"
 
+static int (*mce_ext_err_print)(const char *, int, int);
+
 static DEFINE_MUTEX(mce_chrdev_read_mutex);
 
 #define rcu_dereference_check_mce(p) \
@@ -576,6 +578,21 @@ static void mce_read_aux(struct mce *m, int i)
 
 DEFINE_PER_CPU(unsigned, mce_poll_count);
 
+void register_elog_handler(int (*f)(const char *, int, int))
+{
+	mce_ext_err_print = f;
+}
+EXPORT_SYMBOL_GPL(register_elog_handler);
+
+void unregister_elog_handler(int (*f)(const char *, int, int))
+{
+	if (f) {
+		WARN_ON(mce_ext_err_print != f);
+		mce_ext_err_print = NULL;
+	}
+}
+EXPORT_SYMBOL_GPL(unregister_elog_handler);
+
 /*
  * Poll for corrected events or events that happened before reset.
  * Those are just logged through /dev/mcelog.
@@ -624,6 +641,9 @@ void machine_check_poll(enum mcp_flags flags, mce_banks_t *b)
 		    (m.status & (mca_cfg.ser ? MCI_STATUS_S : MCI_STATUS_UC)))
 			continue;
 
+		if (mce_ext_err_print)
+			mce_ext_err_print(NULL, m.extcpu, i);
+
 		mce_read_aux(&m, i);
 
 		if (!(flags & MCP_TIMESTAMP))
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 22327e6..c67ec61 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -372,4 +372,24 @@ config ACPI_BGRT
 
 source "drivers/acpi/apei/Kconfig"
 
+config ACPI_EXTLOG
+	tristate "Extended Error Log support"
+	depends on X86_MCE
+	default n
+	help
+	  Certain usages such as Predictive Failure Analysis (PFA) require
+	  more information about the error than what can be described in
+	  processor machine check banks. Most server processors log
+	  additional information about the error in processor uncore
+	  registers. Since the addresses and layout of these registers vary
+	  widely from one processor to another, system software cannot
+	  readily make use of them. To complicate matters further, some of
+	  the additional error information cannot be constructed space
+	  between "additional" and "error" without detailed knowledge
+	  about platform topology.
+
+	  Enhanced MCA Logging allows firmware to provide additional error
+	  information to system software, synchronous with MCE or CMCI. This
+	  driver adds support for that functionality.
+
 endif	# ACPI
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index cdaf68b..bce34af 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -82,3 +82,5 @@ processor-$(CONFIG_CPU_FREQ)	+= processor_perflib.o
 obj-$(CONFIG_ACPI_PROCESSOR_AGGREGATOR) += acpi_pad.o
 
 obj-$(CONFIG_ACPI_APEI)		+= apei/
+
+obj-$(CONFIG_ACPI_EXTLOG)	+= acpi_extlog.o
diff --git a/drivers/acpi/acpi_extlog.c b/drivers/acpi/acpi_extlog.c
new file mode 100644
index 0000000..afeab59
--- /dev/null
+++ b/drivers/acpi/acpi_extlog.c
@@ -0,0 +1,319 @@
+/*
+ * Extended Error Log driver
+ *
+ * Copyright (C) 2013 Intel Corp.
+ * Author: Chen, Gong <gong.chen@intel.com>
+ *
+ * This file is licensed under GPLv2.
+ */
+
+#include <linux/module.h>
+#include <linux/acpi.h>
+#include <acpi/acpi_bus.h>
+#include <linux/cper.h>
+#include <linux/ratelimit.h>
+#include <asm/mce.h>
+
+#include "apei/apei-internal.h"
+
+#define EXT_ELOG_ENTRY_MASK	GENMASK_ULL(51, 0) /* elog entry address mask */
+
+#define EXTLOG_DSM_REV		0x0
+#define	EXTLOG_FN_QUERY		0x0
+#define	EXTLOG_FN_ADDR		0x1
+
+#define FLAG_OS_OPTIN		BIT(0)
+#define EXTLOG_QUERY_L1_EXIST	BIT(1)
+#define ELOG_ENTRY_VALID	(1ULL<<63)
+#define ELOG_ENTRY_LEN		0x1000
+
+#define EMCA_BUG \
+	"Can not request iomem region <0x%016llx-0x%016llx> - eMCA disabled\n"
+
+struct extlog_l1_head {
+	u32 ver;	/* Header Version */
+	u32 hdr_len;	/* Header Length */
+	u64 total_len;	/* entire L1 Directory length including this header */
+	u64 elog_base;	/* MCA Error Log Directory base address */
+	u64 elog_len;	/* MCA Error Log Directory length */
+	u32 flags;	/* bit 0 - OS/VMM Opt-in */
+	u8  rev0[12];
+	u32 entries;	/* Valid L1 Directory entries per logical processor */
+	u8  rev1[12];
+};
+
+static u8 extlog_dsm_uuid[] = "663E35AF-CC10-41A4-88EA-5470AF055295";
+
+/* L1 table related physical address */
+static u64 elog_base;
+static size_t elog_size;
+static u64 l1_dirbase;
+static size_t l1_size;
+
+/* L1 table related virtual address */
+static void __iomem *extlog_l1_addr;
+static void __iomem *elog_addr;
+
+static void *elog_buf;
+
+static u64 *l1_entry_base;
+static u32 l1_percpu_entry;
+
+#define ELOG_IDX(cpu, bank) \
+	(cpu_physical_id(cpu) * l1_percpu_entry + (bank))
+
+#define ELOG_ENTRY_DATA(idx) \
+	(*(l1_entry_base + (idx)))
+
+#define ELOG_ENTRY_ADDR(phyaddr) \
+	(phyaddr - elog_base + (u8 *)elog_addr)
+
+static struct acpi_generic_status *extlog_elog_entry_check(int cpu, int bank)
+{
+	int idx;
+	u64 data;
+	struct acpi_generic_status *estatus;
+
+	WARN_ON(cpu < 0);
+	idx = ELOG_IDX(cpu, bank);
+	data = ELOG_ENTRY_DATA(idx);
+	if ((data & ELOG_ENTRY_VALID) == 0)
+		return NULL;
+
+	data &= EXT_ELOG_ENTRY_MASK;
+	estatus = (struct acpi_generic_status *)ELOG_ENTRY_ADDR(data);
+
+	/* if no valid data in elog entry, just return */
+	if (estatus->block_status == 0)
+		return NULL;
+
+	return estatus;
+}
+
+static void __print_extlog_rcd(const char *pfx,
+			       struct acpi_generic_status *estatus, int cpu)
+{
+	static atomic_t seqno;
+	unsigned int curr_seqno;
+	char pfx_seq[64];
+
+	if (!pfx) {
+		if (estatus->error_severity <= CPER_SEV_CORRECTED)
+			pfx = KERN_INFO;
+		else
+			pfx = KERN_ERR;
+	}
+	curr_seqno = atomic_inc_return(&seqno);
+	snprintf(pfx_seq, sizeof(pfx_seq), "%s{%u}", pfx, curr_seqno);
+	printk("%s""Hardware error detected on CPU%d\n", pfx_seq, cpu);
+	cper_estatus_print(pfx_seq, estatus);
+}
+
+static int print_extlog_rcd(const char *pfx,
+			    struct acpi_generic_status *estatus, int cpu)
+{
+	/* Not more than 2 messages every 5 seconds */
+	static DEFINE_RATELIMIT_STATE(ratelimit_corrected, 5*HZ, 2);
+	static DEFINE_RATELIMIT_STATE(ratelimit_uncorrected, 5*HZ, 2);
+	struct ratelimit_state *ratelimit;
+
+	if (estatus->error_severity == CPER_SEV_CORRECTED ||
+	    (estatus->error_severity == CPER_SEV_INFORMATIONAL))
+		ratelimit = &ratelimit_corrected;
+	else
+		ratelimit = &ratelimit_uncorrected;
+	if (__ratelimit(ratelimit)) {
+		__print_extlog_rcd(pfx, estatus, cpu);
+		return 0;
+	}
+
+	return 1;
+}
+
+static int extlog_print(const char *pfx, int cpu, int bank)
+{
+	struct acpi_generic_status *estatus;
+	int rc;
+
+	estatus = extlog_elog_entry_check(cpu, bank);
+	if (estatus == NULL)
+		return -EINVAL;
+
+	memcpy(elog_buf, (void *)estatus, ELOG_ENTRY_LEN);
+	/* clear record status to enable BIOS to update it again */
+	estatus->block_status = 0;
+
+	rc = print_extlog_rcd(pfx, (struct acpi_generic_status *)elog_buf, cpu);
+
+	return rc;
+}
+
+static int extlog_get_dsm(acpi_handle handle, int rev, int func, u64 *ret)
+{
+	struct acpi_buffer buf = {ACPI_ALLOCATE_BUFFER, NULL};
+	struct acpi_object_list input;
+	union acpi_object params[4], *obj;
+	u8 uuid[16];
+	int i;
+
+	acpi_str_to_uuid(extlog_dsm_uuid, uuid);
+	input.count = 4;
+	input.pointer = params;
+	params[0].type = ACPI_TYPE_BUFFER;
+	params[0].buffer.length = 16;
+	params[0].buffer.pointer = uuid;
+	params[1].type = ACPI_TYPE_INTEGER;
+	params[1].integer.value = rev;
+	params[2].type = ACPI_TYPE_INTEGER;
+	params[2].integer.value = func;
+	params[3].type = ACPI_TYPE_PACKAGE;
+	params[3].package.count = 0;
+	params[3].package.elements = NULL;
+
+	if (ACPI_FAILURE(acpi_evaluate_object(handle, "_DSM", &input, &buf)))
+		return -1;
+
+	*ret = 0;
+	obj = (union acpi_object *)buf.pointer;
+	if (obj->type == ACPI_TYPE_INTEGER) {
+		*ret = obj->integer.value;
+	} else if (obj->type == ACPI_TYPE_BUFFER) {
+		if (obj->buffer.length <= 8) {
+			for (i = 0; i < obj->buffer.length; i++)
+				*ret |= (obj->buffer.pointer[i] << (i * 8));
+		}
+	}
+	kfree(buf.pointer);
+
+	return 0;
+}
+
+static bool extlog_get_l1addr(void)
+{
+	acpi_handle handle;
+	u64 ret;
+
+	if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
+		return false;
+
+	if (extlog_get_dsm(handle, EXTLOG_DSM_REV, EXTLOG_FN_QUERY, &ret) ||
+	    !(ret & EXTLOG_QUERY_L1_EXIST))
+		return false;
+
+	if (extlog_get_dsm(handle, EXTLOG_DSM_REV, EXTLOG_FN_ADDR, &ret))
+		return false;
+
+	l1_dirbase = ret;
+	/* Spec says L1 directory must be 4K aligned, bail out if it isn't */
+	if (l1_dirbase & ((1 << 12) - 1)) {
+		pr_warn(FW_BUG "L1 Directory is invalid at physical %llx\n",
+			l1_dirbase);
+		return false;
+	}
+
+	return true;
+}
+
+static int __init extlog_init(void)
+{
+	struct extlog_l1_head *l1_head;
+	void __iomem *extlog_l1_hdr;
+	size_t l1_hdr_size;
+	struct resource *r;
+	u64 cap;
+	int rc;
+
+	rc = -ENODEV;
+
+	rdmsrl(MSR_IA32_MCG_CAP, cap);
+	if (!(cap & MCG_ELOG_P))
+		return rc;
+
+	if (!extlog_get_l1addr())
+		return rc;
+
+	rc = -EINVAL;
+	/* get L1 header to fetch necessary information */
+	l1_hdr_size = sizeof(struct extlog_l1_head);
+	r = request_mem_region(l1_dirbase, l1_hdr_size, "L1 DIR HDR");
+	if (!r) {
+		pr_warn(FW_BUG EMCA_BUG,
+			(unsigned long long)l1_dirbase,
+			(unsigned long long)l1_dirbase + l1_hdr_size);
+		goto err;
+	}
+
+	extlog_l1_hdr = acpi_os_map_memory(l1_dirbase, l1_hdr_size);
+	l1_head = (struct extlog_l1_head *)extlog_l1_hdr;
+	l1_size = l1_head->total_len;
+	l1_percpu_entry = l1_head->entries;
+	elog_base = l1_head->elog_base;
+	elog_size = l1_head->elog_len;
+	acpi_os_unmap_memory(extlog_l1_hdr, l1_hdr_size);
+	release_mem_region(l1_dirbase, l1_hdr_size);
+
+	/* remap L1 header again based on completed information */
+	r = request_mem_region(l1_dirbase, l1_size, "L1 Table");
+	if (!r) {
+		pr_warn(FW_BUG EMCA_BUG,
+			(unsigned long long)l1_dirbase,
+			(unsigned long long)l1_dirbase + l1_size);
+		goto err;
+	}
+	extlog_l1_addr = acpi_os_map_memory(l1_dirbase, l1_size);
+	l1_entry_base = (u64 *)((u8 *)extlog_l1_addr + l1_hdr_size);
+
+	/* remap elog table */
+	r = request_mem_region(elog_base, elog_size, "Elog Table");
+	if (!r) {
+		pr_warn(FW_BUG EMCA_BUG,
+			(unsigned long long)elog_base,
+			(unsigned long long)elog_base + elog_size);
+		goto err_release_l1_dir;
+	}
+	elog_addr = acpi_os_map_memory(elog_base, elog_size);
+
+	rc = -ENOMEM;
+	/* allocate buffer to save elog record */
+	elog_buf = kmalloc(ELOG_ENTRY_LEN, GFP_KERNEL);
+	if (elog_buf == NULL)
+		goto err_release_elog;
+
+	register_elog_handler(extlog_print);
+	/* enable OS to be involved to take over management from BIOS */
+	((struct extlog_l1_head *)extlog_l1_addr)->flags |= FLAG_OS_OPTIN;
+
+	return 0;
+
+err_release_elog:
+	if (elog_addr)
+		acpi_os_unmap_memory(elog_addr, elog_size);
+	release_mem_region(elog_base, elog_size);
+err_release_l1_dir:
+	if (extlog_l1_addr)
+		acpi_os_unmap_memory(extlog_l1_addr, l1_size);
+	release_mem_region(l1_dirbase, l1_size);
+err:
+	pr_warn(FW_BUG "Extended error log disabled because of problems parsing f/w tables\n");
+	return rc;
+}
+
+static void __exit extlog_exit(void)
+{
+	unregister_elog_handler(extlog_print);
+	((struct extlog_l1_head *)extlog_l1_addr)->flags &= ~FLAG_OS_OPTIN;
+	if (extlog_l1_addr)
+		acpi_os_unmap_memory(extlog_l1_addr, l1_size);
+	if (elog_addr)
+		acpi_os_unmap_memory(elog_addr, elog_size);
+	release_mem_region(elog_base, elog_size);
+	release_mem_region(l1_dirbase, l1_size);
+	kfree(elog_buf);
+}
+
+module_init(extlog_init);
+module_exit(extlog_exit);
+
+MODULE_AUTHOR("Chen, Gong <gong.chen@intel.com>");
+MODULE_DESCRIPTION("Extended Error Log Driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index b587ec8..e1bd9a1 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -174,7 +174,7 @@ static void acpi_print_osc_error(acpi_handle handle,
 	printk("\n");
 }
 
-static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
+acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
 {
 	int i;
 	static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
@@ -195,6 +195,7 @@ static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
 	}
 	return AE_OK;
 }
+EXPORT_SYMBOL_GPL(acpi_str_to_uuid);
 
 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 {
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index a5db4ae..c30bac8 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -311,6 +311,7 @@ struct acpi_osc_context {
 #define OSC_INVALID_REVISION_ERROR	8
 #define OSC_CAPABILITIES_MASK_ERROR	16
 
+acpi_status acpi_str_to_uuid(char *str, u8 *uuid);
 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context);
 
 /* platform-wide _OSC bits */
-- 
1.8.4.rc3

[PATCH v3 5/9] DMI: Parse memory device (type 17) in SMBIOS

[Chen, Gong]

This patch adds a new interface to decode memory device (type 17)
to help error reporting on DIMMs.

Original-author: Tony Luck <tony.luck@intel.com>
Signed-off-by: Chen, Gong <gong.chen@linux.intel.com>
Acked-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Acked-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
---
 arch/ia64/kernel/setup.c    |  1 +
 arch/x86/kernel/setup.c     |  1 +
 drivers/firmware/dmi_scan.c | 60 +++++++++++++++++++++++++++++++++++++++++++++
 include/linux/dmi.h         |  5 ++++
 4 files changed, 67 insertions(+)

diff --git a/arch/ia64/kernel/setup.c b/arch/ia64/kernel/setup.c
index 4fc2e95..d86669b 100644
--- a/arch/ia64/kernel/setup.c
+++ b/arch/ia64/kernel/setup.c
@@ -1063,6 +1063,7 @@ check_bugs (void)
 static int __init run_dmi_scan(void)
 {
 	dmi_scan_machine();
+	dmi_memdev_walk();
 	dmi_set_dump_stack_arch_desc();
 	return 0;
 }
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index f0de629..918d489 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -993,6 +993,7 @@ void __init setup_arch(char **cmdline_p)
 		efi_init();
 
 	dmi_scan_machine();
+	dmi_memdev_walk();
 	dmi_set_dump_stack_arch_desc();
 
 	/*
diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c
index fa0affb..59579a7 100644
--- a/drivers/firmware/dmi_scan.c
+++ b/drivers/firmware/dmi_scan.c
@@ -25,6 +25,13 @@ static int dmi_initialized;
 /* DMI system identification string used during boot */
 static char dmi_ids_string[128] __initdata;
 
+static struct dmi_memdev_info {
+	const char *device;
+	const char *bank;
+	u16 handle;
+} *dmi_memdev;
+static int dmi_memdev_nr;
+
 static const char * __init dmi_string_nosave(const struct dmi_header *dm, u8 s)
 {
 	const u8 *bp = ((u8 *) dm) + dm->length;
@@ -322,6 +329,42 @@ static void __init dmi_save_extended_devices(const struct dmi_header *dm)
 	dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d - 1)));
 }
 
+static void __init count_mem_devices(const struct dmi_header *dm, void *v)
+{
+	if (dm->type != DMI_ENTRY_MEM_DEVICE)
+		return;
+	dmi_memdev_nr++;
+}
+
+static void __init save_mem_devices(const struct dmi_header *dm, void *v)
+{
+	const char *d = (const char *)dm;
+	static int nr;
+
+	if (dm->type != DMI_ENTRY_MEM_DEVICE)
+		return;
+	if (nr >= dmi_memdev_nr) {
+		pr_warn(FW_BUG "Too many DIMM entries in SMBIOS table\n");
+		return;
+	}
+	dmi_memdev[nr].handle = dm->handle;
+	dmi_memdev[nr].device = dmi_string(dm, d[0x10]);
+	dmi_memdev[nr].bank = dmi_string(dm, d[0x11]);
+	nr++;
+}
+
+void __init dmi_memdev_walk(void)
+{
+	if (!dmi_available)
+		return;
+
+	if (dmi_walk_early(count_mem_devices) == 0 && dmi_memdev_nr) {
+		dmi_memdev = dmi_alloc(sizeof(*dmi_memdev) * dmi_memdev_nr);
+		if (dmi_memdev)
+			dmi_walk_early(save_mem_devices);
+	}
+}
+
 /*
  *	Process a DMI table entry. Right now all we care about are the BIOS
  *	and machine entries. For 2.5 we should pull the smbus controller info
@@ -815,3 +858,20 @@ bool dmi_match(enum dmi_field f, const char *str)
 	return !strcmp(info, str);
 }
 EXPORT_SYMBOL_GPL(dmi_match);
+
+void dmi_memdev_name(u16 handle, const char **bank, const char **device)
+{
+	int n;
+
+	if (dmi_memdev == NULL)
+		return;
+
+	for (n = 0; n < dmi_memdev_nr; n++) {
+		if (handle == dmi_memdev[n].handle) {
+			*bank = dmi_memdev[n].bank;
+			*device = dmi_memdev[n].device;
+			break;
+		}
+	}
+}
+EXPORT_SYMBOL_GPL(dmi_memdev_name);
diff --git a/include/linux/dmi.h b/include/linux/dmi.h
index b6eb7a0..f820f0a 100644
--- a/include/linux/dmi.h
+++ b/include/linux/dmi.h
@@ -99,6 +99,7 @@ extern const char * dmi_get_system_info(int field);
 extern const struct dmi_device * dmi_find_device(int type, const char *name,
 	const struct dmi_device *from);
 extern void dmi_scan_machine(void);
+extern void dmi_memdev_walk(void);
 extern void dmi_set_dump_stack_arch_desc(void);
 extern bool dmi_get_date(int field, int *yearp, int *monthp, int *dayp);
 extern int dmi_name_in_vendors(const char *str);
@@ -107,6 +108,7 @@ extern int dmi_available;
 extern int dmi_walk(void (*decode)(const struct dmi_header *, void *),
 	void *private_data);
 extern bool dmi_match(enum dmi_field f, const char *str);
+extern void dmi_memdev_name(u16 handle, const char **bank, const char **device);
 
 #else
 
@@ -115,6 +117,7 @@ static inline const char * dmi_get_system_info(int field) { return NULL; }
 static inline const struct dmi_device * dmi_find_device(int type, const char *name,
 	const struct dmi_device *from) { return NULL; }
 static inline void dmi_scan_machine(void) { return; }
+static inline void dmi_memdev_walk(void) { }
 static inline void dmi_set_dump_stack_arch_desc(void) { }
 static inline bool dmi_get_date(int field, int *yearp, int *monthp, int *dayp)
 {
@@ -133,6 +136,8 @@ static inline int dmi_walk(void (*decode)(const struct dmi_header *, void *),
 	void *private_data) { return -1; }
 static inline bool dmi_match(enum dmi_field f, const char *str)
 	{ return false; }
+static inline void dmi_memdev_name(u16 handle, const char **bank,
+		const char **device) { }
 static inline const struct dmi_system_id *
 	dmi_first_match(const struct dmi_system_id *list) { return NULL; }
 
-- 
1.8.4.rc3

[PATCH v3 6/9] ACPI, APEI, CPER: Add UEFI 2.4 support for memory error

[Chen, Gong]

In latest UEFI spec(by now it is 2.4) memory error definition
for CPER (UEFI 2.4 Appendix N Common Platform Error Record)
adds some new fields. These fields help people to locate
memory error on actual DIMM location.

Original-author: Tony Luck <tony.luck@intel.com>
Signed-off-by: Chen, Gong <gong.chen@linux.intel.com>
Reviewed-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Acked-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
---
 arch/x86/kernel/cpu/mcheck/mce-apei.c |  3 +--
 drivers/acpi/apei/cper.c              |  7 ++++---
 drivers/acpi/apei/ghes.c              |  4 ++--
 drivers/edac/ghes_edac.c              |  5 ++---
 include/linux/cper.h                  | 11 +++++++++--
 5 files changed, 18 insertions(+), 12 deletions(-)

diff --git a/arch/x86/kernel/cpu/mcheck/mce-apei.c b/arch/x86/kernel/cpu/mcheck/mce-apei.c
index cd8b166..de8b60a 100644
--- a/arch/x86/kernel/cpu/mcheck/mce-apei.c
+++ b/arch/x86/kernel/cpu/mcheck/mce-apei.c
@@ -42,8 +42,7 @@ void apei_mce_report_mem_error(int corrected, struct cper_sec_mem_err *mem_err)
 	struct mce m;
 
 	/* Only corrected MC is reported */
-	if (!corrected || !(mem_err->validation_bits &
-				CPER_MEM_VALID_PHYSICAL_ADDRESS))
+	if (!corrected || !(mem_err->validation_bits & CPER_MEM_VALID_PA))
 		return;
 
 	mce_setup(&m);
diff --git a/drivers/acpi/apei/cper.c b/drivers/acpi/apei/cper.c
index eb5f6d6..946ef52 100644
--- a/drivers/acpi/apei/cper.c
+++ b/drivers/acpi/apei/cper.c
@@ -8,7 +8,7 @@
  * various tables, such as ERST, BERT and HEST etc.
  *
  * For more information about CPER, please refer to Appendix N of UEFI
- * Specification version 2.3.
+ * Specification version 2.4.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License version
@@ -191,16 +191,17 @@ static const char *cper_mem_err_type_strs[] = {
 	"memory sparing",
 	"scrub corrected error",
 	"scrub uncorrected error",
+	"physical memory map-out event",
 };
 
 static void cper_print_mem(const char *pfx, const struct cper_sec_mem_err *mem)
 {
 	if (mem->validation_bits & CPER_MEM_VALID_ERROR_STATUS)
 		printk("%s""error_status: 0x%016llx\n", pfx, mem->error_status);
-	if (mem->validation_bits & CPER_MEM_VALID_PHYSICAL_ADDRESS)
+	if (mem->validation_bits & CPER_MEM_VALID_PA)
 		printk("%s""physical_address: 0x%016llx\n",
 		       pfx, mem->physical_addr);
-	if (mem->validation_bits & CPER_MEM_VALID_PHYSICAL_ADDRESS_MASK)
+	if (mem->validation_bits & CPER_MEM_VALID_PA_MASK)
 		printk("%s""physical_address_mask: 0x%016llx\n",
 		       pfx, mem->physical_addr_mask);
 	if (mem->validation_bits & CPER_MEM_VALID_NODE)
diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index 0db6e4f..a30bc31 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -419,7 +419,7 @@ static void ghes_handle_memory_failure(struct acpi_generic_data *gdata, int sev)
 
 	if (sec_sev == GHES_SEV_CORRECTED &&
 	    (gdata->flags & CPER_SEC_ERROR_THRESHOLD_EXCEEDED) &&
-	    (mem_err->validation_bits & CPER_MEM_VALID_PHYSICAL_ADDRESS)) {
+	    (mem_err->validation_bits & CPER_MEM_VALID_PA)) {
 		pfn = mem_err->physical_addr >> PAGE_SHIFT;
 		if (pfn_valid(pfn))
 			memory_failure_queue(pfn, 0, MF_SOFT_OFFLINE);
@@ -430,7 +430,7 @@ static void ghes_handle_memory_failure(struct acpi_generic_data *gdata, int sev)
 	}
 	if (sev == GHES_SEV_RECOVERABLE &&
 	    sec_sev == GHES_SEV_RECOVERABLE &&
-	    mem_err->validation_bits & CPER_MEM_VALID_PHYSICAL_ADDRESS) {
+	    mem_err->validation_bits & CPER_MEM_VALID_PA) {
 		pfn = mem_err->physical_addr >> PAGE_SHIFT;
 		memory_failure_queue(pfn, 0, 0);
 	}
diff --git a/drivers/edac/ghes_edac.c b/drivers/edac/ghes_edac.c
index bb53467..0ad797b 100644
--- a/drivers/edac/ghes_edac.c
+++ b/drivers/edac/ghes_edac.c
@@ -297,15 +297,14 @@ void ghes_edac_report_mem_error(struct ghes *ghes, int sev,
 	}
 
 	/* Error address */
-	if (mem_err->validation_bits & CPER_MEM_VALID_PHYSICAL_ADDRESS) {
+	if (mem_err->validation_bits & CPER_MEM_VALID_PA) {
 		e->page_frame_number = mem_err->physical_addr >> PAGE_SHIFT;
 		e->offset_in_page = mem_err->physical_addr & ~PAGE_MASK;
 	}
 
 	/* Error grain */
-	if (mem_err->validation_bits & CPER_MEM_VALID_PHYSICAL_ADDRESS_MASK) {
+	if (mem_err->validation_bits & CPER_MEM_VALID_PA_MASK)
 		e->grain = ~(mem_err->physical_addr_mask & ~PAGE_MASK);
-	}
 
 	/* Memory error location, mapped on e->location */
 	p = e->location;
diff --git a/include/linux/cper.h b/include/linux/cper.h
index 09ebe21..2fc0ec3 100644
--- a/include/linux/cper.h
+++ b/include/linux/cper.h
@@ -218,8 +218,8 @@ enum {
 #define CPER_PROC_VALID_IP			0x1000
 
 #define CPER_MEM_VALID_ERROR_STATUS		0x0001
-#define CPER_MEM_VALID_PHYSICAL_ADDRESS		0x0002
-#define CPER_MEM_VALID_PHYSICAL_ADDRESS_MASK	0x0004
+#define CPER_MEM_VALID_PA			0x0002
+#define CPER_MEM_VALID_PA_MASK			0x0004
 #define CPER_MEM_VALID_NODE			0x0008
 #define CPER_MEM_VALID_CARD			0x0010
 #define CPER_MEM_VALID_MODULE			0x0020
@@ -232,6 +232,9 @@ enum {
 #define CPER_MEM_VALID_RESPONDER_ID		0x1000
 #define CPER_MEM_VALID_TARGET_ID		0x2000
 #define CPER_MEM_VALID_ERROR_TYPE		0x4000
+#define CPER_MEM_VALID_RANK_NUMBER		0x8000
+#define CPER_MEM_VALID_CARD_HANDLE		0x10000
+#define CPER_MEM_VALID_MODULE_HANDLE		0x20000
 
 #define CPER_PCIE_VALID_PORT_TYPE		0x0001
 #define CPER_PCIE_VALID_VERSION			0x0002
@@ -347,6 +350,10 @@ struct cper_sec_mem_err {
 	__u64	responder_id;
 	__u64	target_id;
 	__u8	error_type;
+	__u8	reserved;
+	__u16	rank;
+	__u16	mem_array_handle;	/* card handle in UEFI 2.4 */
+	__u16	mem_dev_handle;		/* module handle in UEFI 2.4 */
 };
 
 struct cper_sec_pcie {
-- 
1.8.4.rc3

[PATCH v3 7/9] ACPI, APEI, CPER: Enhance memory reporting capability

[Chen, Gong]

After H/W error happens under FFM enabled mode, lots of information
are shown but some important parts like DIMM location missed. This
patch is used to show these extra fileds.

Original-author: Tony Luck <tony.luck@intel.com>
Signed-off-by: Chen, Gong <gong.chen@linux.intel.com>
Acked-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Acked-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
---
 drivers/acpi/apei/cper.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/acpi/apei/cper.c b/drivers/acpi/apei/cper.c
index 946ef52..b1a8a55 100644
--- a/drivers/acpi/apei/cper.c
+++ b/drivers/acpi/apei/cper.c
@@ -28,6 +28,7 @@
 #include <linux/module.h>
 #include <linux/time.h>
 #include <linux/cper.h>
+#include <linux/dmi.h>
 #include <linux/acpi.h>
 #include <linux/pci.h>
 #include <linux/aer.h>
@@ -210,6 +211,8 @@ static void cper_print_mem(const char *pfx, const struct cper_sec_mem_err *mem)
 		printk("%s""card: %d\n", pfx, mem->card);
 	if (mem->validation_bits & CPER_MEM_VALID_MODULE)
 		printk("%s""module: %d\n", pfx, mem->module);
+	if (mem->validation_bits & CPER_MEM_VALID_RANK_NUMBER)
+		printk("%s""rank: %d\n", pfx, mem->rank);
 	if (mem->validation_bits & CPER_MEM_VALID_BANK)
 		printk("%s""bank: %d\n", pfx, mem->bank);
 	if (mem->validation_bits & CPER_MEM_VALID_DEVICE)
@@ -232,6 +235,15 @@ static void cper_print_mem(const char *pfx, const struct cper_sec_mem_err *mem)
 		       etype < ARRAY_SIZE(cper_mem_err_type_strs) ?
 		       cper_mem_err_type_strs[etype] : "unknown");
 	}
+	if (mem->validation_bits & CPER_MEM_VALID_MODULE_HANDLE) {
+		const char *bank = NULL, *device = NULL;
+		dmi_memdev_name(mem->mem_dev_handle, &bank, &device);
+		if (bank != NULL && device != NULL)
+			printk("%s""DIMM location: %s %s", pfx, bank, device);
+		else
+			printk("%s""DIMM DMI handle: 0x%.4x",
+			       pfx, mem->mem_dev_handle);
+	}
 }
 
 static const char *cper_pcie_port_type_strs[] = {
-- 
1.8.4.rc3

[PATCH v3 8/9] ACPI, APEI, CPER: Cleanup CPER memory error output format

[Chen, Gong]

Keep up only the most important fields for memory error
reporting. The detail information will be moved to perf/trace
interface.

Suggested-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Chen, Gong <gong.chen@linux.intel.com>
Reviewed-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
---
 drivers/acpi/apei/cper.c | 67 ++++++++++++++++++++++--------------------------
 1 file changed, 31 insertions(+), 36 deletions(-)

diff --git a/drivers/acpi/apei/cper.c b/drivers/acpi/apei/cper.c
index b1a8a55..9dd54e1 100644
--- a/drivers/acpi/apei/cper.c
+++ b/drivers/acpi/apei/cper.c
@@ -33,6 +33,7 @@
 #include <linux/pci.h>
 #include <linux/aer.h>
 
+#define INDENT_SP	" "
 /*
  * CPER record ID need to be unique even after reboot, because record
  * ID is used as index for ERST storage, while CPER records from
@@ -206,29 +207,29 @@ static void cper_print_mem(const char *pfx, const struct cper_sec_mem_err *mem)
 		printk("%s""physical_address_mask: 0x%016llx\n",
 		       pfx, mem->physical_addr_mask);
 	if (mem->validation_bits & CPER_MEM_VALID_NODE)
-		printk("%s""node: %d\n", pfx, mem->node);
+		pr_debug("node: %d\n", mem->node);
 	if (mem->validation_bits & CPER_MEM_VALID_CARD)
-		printk("%s""card: %d\n", pfx, mem->card);
+		pr_debug("card: %d\n", mem->card);
 	if (mem->validation_bits & CPER_MEM_VALID_MODULE)
-		printk("%s""module: %d\n", pfx, mem->module);
+		pr_debug("module: %d\n", mem->module);
 	if (mem->validation_bits & CPER_MEM_VALID_RANK_NUMBER)
-		printk("%s""rank: %d\n", pfx, mem->rank);
+		pr_debug("rank: %d\n", mem->rank);
 	if (mem->validation_bits & CPER_MEM_VALID_BANK)
-		printk("%s""bank: %d\n", pfx, mem->bank);
+		pr_debug("bank: %d\n", mem->bank);
 	if (mem->validation_bits & CPER_MEM_VALID_DEVICE)
-		printk("%s""device: %d\n", pfx, mem->device);
+		pr_debug("device: %d\n", mem->device);
 	if (mem->validation_bits & CPER_MEM_VALID_ROW)
-		printk("%s""row: %d\n", pfx, mem->row);
+		pr_debug("row: %d\n", mem->row);
 	if (mem->validation_bits & CPER_MEM_VALID_COLUMN)
-		printk("%s""column: %d\n", pfx, mem->column);
+		pr_debug("column: %d\n", mem->column);
 	if (mem->validation_bits & CPER_MEM_VALID_BIT_POSITION)
-		printk("%s""bit_position: %d\n", pfx, mem->bit_pos);
+		pr_debug("bit_position: %d\n", mem->bit_pos);
 	if (mem->validation_bits & CPER_MEM_VALID_REQUESTOR_ID)
-		printk("%s""requestor_id: 0x%016llx\n", pfx, mem->requestor_id);
+		pr_debug("requestor_id: 0x%016llx\n", mem->requestor_id);
 	if (mem->validation_bits & CPER_MEM_VALID_RESPONDER_ID)
-		printk("%s""responder_id: 0x%016llx\n", pfx, mem->responder_id);
+		pr_debug("responder_id: 0x%016llx\n", mem->responder_id);
 	if (mem->validation_bits & CPER_MEM_VALID_TARGET_ID)
-		printk("%s""target_id: 0x%016llx\n", pfx, mem->target_id);
+		pr_debug("target_id: 0x%016llx\n", mem->target_id);
 	if (mem->validation_bits & CPER_MEM_VALID_ERROR_TYPE) {
 		u8 etype = mem->error_type;
 		printk("%s""error_type: %d, %s\n", pfx, etype,
@@ -296,55 +297,45 @@ static void cper_print_pcie(const char *pfx, const struct cper_sec_pcie *pcie,
 	pfx, pcie->bridge.secondary_status, pcie->bridge.control);
 }
 
-static const char * const cper_estatus_section_flag_strs[] = {
-	"primary",
-	"containment warning",
-	"reset",
-	"error threshold exceeded",
-	"resource not accessible",
-	"latent error",
-};
-
 static void cper_estatus_print_section(
 	const char *pfx, const struct acpi_generic_data *gdata, int sec_no)
 {
 	uuid_le *sec_type = (uuid_le *)gdata->section_type;
 	__u16 severity;
+	char newpfx[64];
 
 	severity = gdata->error_severity;
-	printk("%s""section: %d, severity: %d, %s\n", pfx, sec_no, severity,
+	printk("%s""Error %d, type: %s\n", pfx, sec_no,
 	       cper_severity_str(severity));
-	printk("%s""flags: 0x%02x\n", pfx, gdata->flags);
-	cper_print_bits(pfx, gdata->flags, cper_estatus_section_flag_strs,
-			ARRAY_SIZE(cper_estatus_section_flag_strs));
 	if (gdata->validation_bits & CPER_SEC_VALID_FRU_ID)
 		printk("%s""fru_id: %pUl\n", pfx, (uuid_le *)gdata->fru_id);
 	if (gdata->validation_bits & CPER_SEC_VALID_FRU_TEXT)
 		printk("%s""fru_text: %.20s\n", pfx, gdata->fru_text);
 
+	snprintf(newpfx, sizeof(newpfx), "%s%s", pfx, INDENT_SP);
 	if (!uuid_le_cmp(*sec_type, CPER_SEC_PROC_GENERIC)) {
 		struct cper_sec_proc_generic *proc_err = (void *)(gdata + 1);
-		printk("%s""section_type: general processor error\n", pfx);
+		printk("%s""section_type: general processor error\n", newpfx);
 		if (gdata->error_data_length >= sizeof(*proc_err))
-			cper_print_proc_generic(pfx, proc_err);
+			cper_print_proc_generic(newpfx, proc_err);
 		else
 			goto err_section_too_small;
 	} else if (!uuid_le_cmp(*sec_type, CPER_SEC_PLATFORM_MEM)) {
 		struct cper_sec_mem_err *mem_err = (void *)(gdata + 1);
-		printk("%s""section_type: memory error\n", pfx);
+		printk("%s""section_type: memory error\n", newpfx);
 		if (gdata->error_data_length >= sizeof(*mem_err))
-			cper_print_mem(pfx, mem_err);
+			cper_print_mem(newpfx, mem_err);
 		else
 			goto err_section_too_small;
 	} else if (!uuid_le_cmp(*sec_type, CPER_SEC_PCIE)) {
 		struct cper_sec_pcie *pcie = (void *)(gdata + 1);
-		printk("%s""section_type: PCIe error\n", pfx);
+		printk("%s""section_type: PCIe error\n", newpfx);
 		if (gdata->error_data_length >= sizeof(*pcie))
-			cper_print_pcie(pfx, pcie, gdata);
+			cper_print_pcie(newpfx, pcie, gdata);
 		else
 			goto err_section_too_small;
 	} else
-		printk("%s""section type: unknown, %pUl\n", pfx, sec_type);
+		printk("%s""section type: unknown, %pUl\n", newpfx, sec_type);
 
 	return;
 
@@ -358,17 +349,21 @@ void cper_estatus_print(const char *pfx,
 	struct acpi_generic_data *gdata;
 	unsigned int data_len, gedata_len;
 	int sec_no = 0;
+	char newpfx[64];
 	__u16 severity;
 
-	printk("%s""Generic Hardware Error Status\n", pfx);
 	severity = estatus->error_severity;
-	printk("%s""severity: %d, %s\n", pfx, severity,
-	       cper_severity_str(severity));
+	if (severity != CPER_SEV_FATAL)
+		printk("%s%s\n", pfx,
+		       "It has been corrected by h/w "
+		       "and requires no further action");
+	printk("%s""event severity: %s\n", pfx, cper_severity_str(severity));
 	data_len = estatus->data_length;
 	gdata = (struct acpi_generic_data *)(estatus + 1);
+	snprintf(newpfx, sizeof(newpfx), "%s%s", pfx, INDENT_SP);
 	while (data_len >= sizeof(*gdata)) {
 		gedata_len = gdata->error_data_length;
-		cper_estatus_print_section(pfx, gdata, sec_no);
+		cper_estatus_print_section(newpfx, gdata, sec_no);
 		data_len -= gedata_len + sizeof(*gdata);
 		gdata = (void *)(gdata + 1) + gedata_len;
 		sec_no++;
-- 
1.8.4.rc3

[PATCH v3 9/9] EDAC, GHES: Update ghes error record info

[Chen, Gong]

In latest UEFI spec(by now it's 2.4) there are some new
fields for memory error reporting. Add these new fields for
ghes_edac interface.

Signed-off-by: Chen, Gong <gong.chen@linux.intel.com>
Cc: Mauro Carvalho Chehab <m.chehab@samsung.com>
---
 drivers/edac/ghes_edac.c | 11 +++++++++++
 include/linux/edac.h     |  2 +-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/edac/ghes_edac.c b/drivers/edac/ghes_edac.c
index 0ad797b..d5a98a4 100644
--- a/drivers/edac/ghes_edac.c
+++ b/drivers/edac/ghes_edac.c
@@ -314,6 +314,8 @@ void ghes_edac_report_mem_error(struct ghes *ghes, int sev,
 		p += sprintf(p, "card:%d ", mem_err->card);
 	if (mem_err->validation_bits & CPER_MEM_VALID_MODULE)
 		p += sprintf(p, "module:%d ", mem_err->module);
+	if (mem_err->validation_bits & CPER_MEM_VALID_RANK_NUMBER)
+		p += sprintf(p, "rank:%d ", mem_err->rank);
 	if (mem_err->validation_bits & CPER_MEM_VALID_BANK)
 		p += sprintf(p, "bank:%d ", mem_err->bank);
 	if (mem_err->validation_bits & CPER_MEM_VALID_ROW)
@@ -322,6 +324,15 @@ void ghes_edac_report_mem_error(struct ghes *ghes, int sev,
 		p += sprintf(p, "col:%d ", mem_err->column);
 	if (mem_err->validation_bits & CPER_MEM_VALID_BIT_POSITION)
 		p += sprintf(p, "bit_pos:%d ", mem_err->bit_pos);
+	if (mem_err->validation_bits & CPER_MEM_VALID_MODULE_HANDLE) {
+		const char *bank = NULL, *device = NULL;
+		dmi_memdev_name(mem_err->mem_dev_handle, &bank, &device);
+		if (bank != NULL && device != NULL)
+			p += sprintf(p, "DIMM location:%s %s ", bank, device);
+		else
+			p += sprintf(p, "DIMM DMI handle: 0x%.4x ",
+				     mem_err->mem_dev_handle);
+	}
 	if (p > e->location)
 		*(p - 1) = '\0';
 
diff --git a/include/linux/edac.h b/include/linux/edac.h
index 5c6d7fb..dbdffe8 100644
--- a/include/linux/edac.h
+++ b/include/linux/edac.h
@@ -51,7 +51,7 @@ static inline void opstate_init(void)
 #define EDAC_MC_LABEL_LEN	31
 
 /* Maximum size of the location string */
-#define LOCATION_SIZE 80
+#define LOCATION_SIZE 256
 
 /* Defines the maximum number of labels that can be reported */
 #define EDAC_MAX_LABELS		8
-- 
1.8.4.rc3

Re: [PATCH v3 0/9] Extended H/W error log driver

[Borislav Petkov]

On Fri, Oct 18, 2013 at 04:23:35AM -0400, Chen, Gong wrote:
> OK, this is the 3rd version. Hope it is the last one :-).

It looks ok to me so far, I'm guessing Tony you're picking this up or
should I?

> this version just updates some minors places and apply some Ack/Review
> information. In this version I remove the last patch for trace
> interface. Maybe it is time to build a new RAS trace interface to
> integrate all RAS related error report interfaces now.

Yeah, let's start small here by moving the CREATE_TRACE_POINTS macro
definition to something like arch/x86/ras/core.c and work slowly up from
there. We have ras_event.h for tracepoints already.

Thanks.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
--

Re: [PATCH v3 8/9] ACPI, APEI, CPER: Cleanup CPER memory error output format

[Naveen N. Rao]

On 10/18/2013 01:53 PM, Chen, Gong wrote:
> Keep up only the most important fields for memory error
> reporting. The detail information will be moved to perf/trace
> interface.
>
> Suggested-by: Tony Luck <tony.luck@intel.com>
> Signed-off-by: Chen, Gong <gong.chen@linux.intel.com>
> Reviewed-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
> ---
>   drivers/acpi/apei/cper.c | 67 ++++++++++++++++++++++--------------------------
>   1 file changed, 31 insertions(+), 36 deletions(-)
>
> diff --git a/drivers/acpi/apei/cper.c b/drivers/acpi/apei/cper.c
> index b1a8a55..9dd54e1 100644
> --- a/drivers/acpi/apei/cper.c
> +++ b/drivers/acpi/apei/cper.c
> @@ -33,6 +33,7 @@
>   #include <linux/pci.h>
>   #include <linux/aer.h>
>
> +#define INDENT_SP	" "
>   /*
>    * CPER record ID need to be unique even after reboot, because record
>    * ID is used as index for ERST storage, while CPER records from
> @@ -206,29 +207,29 @@ static void cper_print_mem(const char *pfx, const struct cper_sec_mem_err *mem)
>   		printk("%s""physical_address_mask: 0x%016llx\n",
>   		       pfx, mem->physical_addr_mask);

Can you also change the above address mask to pr_debug(). I don't think 
this is useful at all if set, since we always deal at a page granularity.

>   	if (mem->validation_bits & CPER_MEM_VALID_NODE)
> -		printk("%s""node: %d\n", pfx, mem->node);
> +		pr_debug("node: %d\n", mem->node);
>   	if (mem->validation_bits & CPER_MEM_VALID_CARD)
> -		printk("%s""card: %d\n", pfx, mem->card);
> +		pr_debug("card: %d\n", mem->card);
>   	if (mem->validation_bits & CPER_MEM_VALID_MODULE)
> -		printk("%s""module: %d\n", pfx, mem->module);
> +		pr_debug("module: %d\n", mem->module);
>   	if (mem->validation_bits & CPER_MEM_VALID_RANK_NUMBER)
> -		printk("%s""rank: %d\n", pfx, mem->rank);
> +		pr_debug("rank: %d\n", mem->rank);
>   	if (mem->validation_bits & CPER_MEM_VALID_BANK)
> -		printk("%s""bank: %d\n", pfx, mem->bank);
> +		pr_debug("bank: %d\n", mem->bank);
>   	if (mem->validation_bits & CPER_MEM_VALID_DEVICE)
> -		printk("%s""device: %d\n", pfx, mem->device);
> +		pr_debug("device: %d\n", mem->device);
>   	if (mem->validation_bits & CPER_MEM_VALID_ROW)
> -		printk("%s""row: %d\n", pfx, mem->row);
> +		pr_debug("row: %d\n", mem->row);
>   	if (mem->validation_bits & CPER_MEM_VALID_COLUMN)
> -		printk("%s""column: %d\n", pfx, mem->column);
> +		pr_debug("column: %d\n", mem->column);
>   	if (mem->validation_bits & CPER_MEM_VALID_BIT_POSITION)
> -		printk("%s""bit_position: %d\n", pfx, mem->bit_pos);
> +		pr_debug("bit_position: %d\n", mem->bit_pos);
>   	if (mem->validation_bits & CPER_MEM_VALID_REQUESTOR_ID)
> -		printk("%s""requestor_id: 0x%016llx\n", pfx, mem->requestor_id);
> +		pr_debug("requestor_id: 0x%016llx\n", mem->requestor_id);
>   	if (mem->validation_bits & CPER_MEM_VALID_RESPONDER_ID)
> -		printk("%s""responder_id: 0x%016llx\n", pfx, mem->responder_id);
> +		pr_debug("responder_id: 0x%016llx\n", mem->responder_id);
>   	if (mem->validation_bits & CPER_MEM_VALID_TARGET_ID)
> -		printk("%s""target_id: 0x%016llx\n", pfx, mem->target_id);
> +		pr_debug("target_id: 0x%016llx\n", mem->target_id);
>   	if (mem->validation_bits & CPER_MEM_VALID_ERROR_TYPE) {
>   		u8 etype = mem->error_type;
>   		printk("%s""error_type: %d, %s\n", pfx, etype,
> @@ -296,55 +297,45 @@ static void cper_print_pcie(const char *pfx, const struct cper_sec_pcie *pcie,
>   	pfx, pcie->bridge.secondary_status, pcie->bridge.control);
>   }
>
> -static const char * const cper_estatus_section_flag_strs[] = {
> -	"primary",
> -	"containment warning",
> -	"reset",
> -	"error threshold exceeded",
> -	"resource not accessible",
> -	"latent error",
> -};
> -
>   static void cper_estatus_print_section(
>   	const char *pfx, const struct acpi_generic_data *gdata, int sec_no)
>   {
>   	uuid_le *sec_type = (uuid_le *)gdata->section_type;
>   	__u16 severity;
> +	char newpfx[64];
>
>   	severity = gdata->error_severity;
> -	printk("%s""section: %d, severity: %d, %s\n", pfx, sec_no, severity,
> +	printk("%s""Error %d, type: %s\n", pfx, sec_no,

Nit: Isn't the original text more appropriate here? We are printing each 
section in the error status block. So, section 0, 1 makes better sense 
for me rather than calling these as errors. Each of these sub-sections 
(if more than one) refer to the same error event per the ACPI spec.

>   	       cper_severity_str(severity));
> -	printk("%s""flags: 0x%02x\n", pfx, gdata->flags);
> -	cper_print_bits(pfx, gdata->flags, cper_estatus_section_flag_strs,
> -			ARRAY_SIZE(cper_estatus_section_flag_strs));
>   	if (gdata->validation_bits & CPER_SEC_VALID_FRU_ID)
>   		printk("%s""fru_id: %pUl\n", pfx, (uuid_le *)gdata->fru_id);
>   	if (gdata->validation_bits & CPER_SEC_VALID_FRU_TEXT)
>   		printk("%s""fru_text: %.20s\n", pfx, gdata->fru_text);
>
> +	snprintf(newpfx, sizeof(newpfx), "%s%s", pfx, INDENT_SP);
>   	if (!uuid_le_cmp(*sec_type, CPER_SEC_PROC_GENERIC)) {
>   		struct cper_sec_proc_generic *proc_err = (void *)(gdata + 1);
> -		printk("%s""section_type: general processor error\n", pfx);
> +		printk("%s""section_type: general processor error\n", newpfx);
>   		if (gdata->error_data_length >= sizeof(*proc_err))
> -			cper_print_proc_generic(pfx, proc_err);
> +			cper_print_proc_generic(newpfx, proc_err);
>   		else
>   			goto err_section_too_small;
>   	} else if (!uuid_le_cmp(*sec_type, CPER_SEC_PLATFORM_MEM)) {
>   		struct cper_sec_mem_err *mem_err = (void *)(gdata + 1);
> -		printk("%s""section_type: memory error\n", pfx);
> +		printk("%s""section_type: memory error\n", newpfx);
>   		if (gdata->error_data_length >= sizeof(*mem_err))
> -			cper_print_mem(pfx, mem_err);
> +			cper_print_mem(newpfx, mem_err);
>   		else
>   			goto err_section_too_small;
>   	} else if (!uuid_le_cmp(*sec_type, CPER_SEC_PCIE)) {
>   		struct cper_sec_pcie *pcie = (void *)(gdata + 1);
> -		printk("%s""section_type: PCIe error\n", pfx);
> +		printk("%s""section_type: PCIe error\n", newpfx);
>   		if (gdata->error_data_length >= sizeof(*pcie))
> -			cper_print_pcie(pfx, pcie, gdata);
> +			cper_print_pcie(newpfx, pcie, gdata);
>   		else
>   			goto err_section_too_small;
>   	} else
> -		printk("%s""section type: unknown, %pUl\n", pfx, sec_type);
> +		printk("%s""section type: unknown, %pUl\n", newpfx, sec_type);
>
>   	return;
>
> @@ -358,17 +349,21 @@ void cper_estatus_print(const char *pfx,
>   	struct acpi_generic_data *gdata;
>   	unsigned int data_len, gedata_len;
>   	int sec_no = 0;
> +	char newpfx[64];
>   	__u16 severity;
>
> -	printk("%s""Generic Hardware Error Status\n", pfx);
>   	severity = estatus->error_severity;
> -	printk("%s""severity: %d, %s\n", pfx, severity,
> -	       cper_severity_str(severity));
> +	if (severity != CPER_SEV_FATAL)

Shouldn't this just be (severity == CPER_SEV_CORRECTED)?

Thanks,
Naveen

> +		printk("%s%s\n", pfx,
> +		       "It has been corrected by h/w "
> +		       "and requires no further action");
> +	printk("%s""event severity: %s\n", pfx, cper_severity_str(severity));
>   	data_len = estatus->data_length;
>   	gdata = (struct acpi_generic_data *)(estatus + 1);
> +	snprintf(newpfx, sizeof(newpfx), "%s%s", pfx, INDENT_SP);
>   	while (data_len >= sizeof(*gdata)) {
>   		gedata_len = gdata->error_data_length;
> -		cper_estatus_print_section(pfx, gdata, sec_no);
> +		cper_estatus_print_section(newpfx, gdata, sec_no);
>   		data_len -= gedata_len + sizeof(*gdata);
>   		gdata = (void *)(gdata + 1) + gedata_len;
>   		sec_no++;
>

Re: [PATCH v3 4/9] ACPI, x86: Extended error log driver for x86 platform

[Naveen N. Rao]

On 10/18/2013 01:53 PM, Chen, Gong wrote:
> This H/W error log driver (a.k.a eMCA driver) is implemented based on
> http://www.intel.com/content/www/us/en/architecture-and-technology/enhanced-mca-logging-xeon-paper.html
>
> After errors are captured, more valuable information can be
> got via this new enhanced H/W error log driver.
>
> v3 -> v2: fix a MACRO definition error and some cleanup
> v2 -> v1: eliminate spin_lock & minor fixes suggested by Boris
>
> Signed-off-by: Chen, Gong <gong.chen@linux.intel.com>
> ---
>   arch/x86/include/asm/mce.h       |   5 +
>   arch/x86/kernel/cpu/mcheck/mce.c |  20 +++
>   drivers/acpi/Kconfig             |  20 +++
>   drivers/acpi/Makefile            |   2 +
>   drivers/acpi/acpi_extlog.c       | 319 +++++++++++++++++++++++++++++++++++++++
>   drivers/acpi/bus.c               |   3 +-
>   include/linux/acpi.h             |   1 +
>   7 files changed, 369 insertions(+), 1 deletion(-)
>   create mode 100644 drivers/acpi/acpi_extlog.c
>
> diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h
> index cbe6b9e..072b2f8 100644
> --- a/arch/x86/include/asm/mce.h
> +++ b/arch/x86/include/asm/mce.h
> @@ -16,6 +16,7 @@
>   #define MCG_EXT_CNT_SHIFT	16
>   #define MCG_EXT_CNT(c)		(((c) & MCG_EXT_CNT_MASK) >> MCG_EXT_CNT_SHIFT)
>   #define MCG_SER_P		(1ULL<<24)   /* MCA recovery/new status bits */
> +#define MCG_ELOG_P		(1ULL<<26)   /* Extended error log supported */
>
>   /* MCG_STATUS register defines */
>   #define MCG_STATUS_RIPV  (1ULL<<0)   /* restart ip valid */
> @@ -186,6 +187,10 @@ enum mcp_flags {
>   	MCP_UC = (1 << 1),		/* log uncorrected errors */
>   	MCP_DONTLOG = (1 << 2),		/* only clear, don't log */
>   };
> +
> +void register_elog_handler(int (*f)(const char *, int, int));
> +void unregister_elog_handler(int (*f)(const char *, int, int));
> +
>   void machine_check_poll(enum mcp_flags flags, mce_banks_t *b);
>
>   int mce_notify_irq(void);
> diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
> index b3218cd..981e0d3 100644
> --- a/arch/x86/kernel/cpu/mcheck/mce.c
> +++ b/arch/x86/kernel/cpu/mcheck/mce.c
> @@ -48,6 +48,8 @@
>
>   #include "mce-internal.h"
>
> +static int (*mce_ext_err_print)(const char *, int, int);
> +
>   static DEFINE_MUTEX(mce_chrdev_read_mutex);
>
>   #define rcu_dereference_check_mce(p) \
> @@ -576,6 +578,21 @@ static void mce_read_aux(struct mce *m, int i)
>
>   DEFINE_PER_CPU(unsigned, mce_poll_count);
>
> +void register_elog_handler(int (*f)(const char *, int, int))
> +{
> +	mce_ext_err_print = f;
> +}
> +EXPORT_SYMBOL_GPL(register_elog_handler);
> +
> +void unregister_elog_handler(int (*f)(const char *, int, int))
> +{
> +	if (f) {
> +		WARN_ON(mce_ext_err_print != f);
> +		mce_ext_err_print = NULL;
> +	}
> +}
> +EXPORT_SYMBOL_GPL(unregister_elog_handler);
> +
>   /*
>    * Poll for corrected events or events that happened before reset.
>    * Those are just logged through /dev/mcelog.
> @@ -624,6 +641,9 @@ void machine_check_poll(enum mcp_flags flags, mce_banks_t *b)
>   		    (m.status & (mca_cfg.ser ? MCI_STATUS_S : MCI_STATUS_UC)))
>   			continue;
>
> +		if (mce_ext_err_print)
> +			mce_ext_err_print(NULL, m.extcpu, i);
> +

Can we use the notifier chain we already have: 
mce_register_decode_chain()? EDAC uses this and I'm wondering if it is a 
good fit here. As an added bonus, it seems to honor dont_log_ce option 
as well.

>   		mce_read_aux(&m, i);
>
>   		if (!(flags & MCP_TIMESTAMP))
> diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
> index 22327e6..c67ec61 100644
> --- a/drivers/acpi/Kconfig
> +++ b/drivers/acpi/Kconfig
> @@ -372,4 +372,24 @@ config ACPI_BGRT
>
>   source "drivers/acpi/apei/Kconfig"
>
> +config ACPI_EXTLOG
> +	tristate "Extended Error Log support"
> +	depends on X86_MCE

I think you also have a dependancy on ACPI_APEI for apei_estatus_print()

> +	default n
> +	help
> +	  Certain usages such as Predictive Failure Analysis (PFA) require
> +	  more information about the error than what can be described in
> +	  processor machine check banks. Most server processors log
> +	  additional information about the error in processor uncore
> +	  registers. Since the addresses and layout of these registers vary
> +	  widely from one processor to another, system software cannot
> +	  readily make use of them. To complicate matters further, some of
> +	  the additional error information cannot be constructed space
> +	  between "additional" and "error" without detailed knowledge

Oops... looks like copy+paste went wrong ;)

> +	  about platform topology.
> +
> +	  Enhanced MCA Logging allows firmware to provide additional error
> +	  information to system software, synchronous with MCE or CMCI. This
> +	  driver adds support for that functionality.
> +
>   endif	# ACPI
> diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
> index cdaf68b..bce34af 100644
> --- a/drivers/acpi/Makefile
> +++ b/drivers/acpi/Makefile
> @@ -82,3 +82,5 @@ processor-$(CONFIG_CPU_FREQ)	+= processor_perflib.o
>   obj-$(CONFIG_ACPI_PROCESSOR_AGGREGATOR) += acpi_pad.o
>
>   obj-$(CONFIG_ACPI_APEI)		+= apei/
> +
> +obj-$(CONFIG_ACPI_EXTLOG)	+= acpi_extlog.o
> diff --git a/drivers/acpi/acpi_extlog.c b/drivers/acpi/acpi_extlog.c
> new file mode 100644
> index 0000000..afeab59
> --- /dev/null
> +++ b/drivers/acpi/acpi_extlog.c
> @@ -0,0 +1,319 @@
> +/*
> + * Extended Error Log driver
> + *
> + * Copyright (C) 2013 Intel Corp.
> + * Author: Chen, Gong <gong.chen@intel.com>
> + *
> + * This file is licensed under GPLv2.
> + */
> +
> +#include <linux/module.h>
> +#include <linux/acpi.h>
> +#include <acpi/acpi_bus.h>
> +#include <linux/cper.h>
> +#include <linux/ratelimit.h>
> +#include <asm/mce.h>
> +
> +#include "apei/apei-internal.h"
> +
> +#define EXT_ELOG_ENTRY_MASK	GENMASK_ULL(51, 0) /* elog entry address mask */
> +
> +#define EXTLOG_DSM_REV		0x0
> +#define	EXTLOG_FN_QUERY		0x0
> +#define	EXTLOG_FN_ADDR		0x1
> +
> +#define FLAG_OS_OPTIN		BIT(0)
> +#define EXTLOG_QUERY_L1_EXIST	BIT(1)
> +#define ELOG_ENTRY_VALID	(1ULL<<63)
> +#define ELOG_ENTRY_LEN		0x1000
> +
> +#define EMCA_BUG \
> +	"Can not request iomem region <0x%016llx-0x%016llx> - eMCA disabled\n"
> +
> +struct extlog_l1_head {
> +	u32 ver;	/* Header Version */
> +	u32 hdr_len;	/* Header Length */
> +	u64 total_len;	/* entire L1 Directory length including this header */
> +	u64 elog_base;	/* MCA Error Log Directory base address */
> +	u64 elog_len;	/* MCA Error Log Directory length */
> +	u32 flags;	/* bit 0 - OS/VMM Opt-in */
> +	u8  rev0[12];
> +	u32 entries;	/* Valid L1 Directory entries per logical processor */
> +	u8  rev1[12];
> +};
> +
> +static u8 extlog_dsm_uuid[] = "663E35AF-CC10-41A4-88EA-5470AF055295";
> +
> +/* L1 table related physical address */
> +static u64 elog_base;
> +static size_t elog_size;
> +static u64 l1_dirbase;
> +static size_t l1_size;
> +
> +/* L1 table related virtual address */
> +static void __iomem *extlog_l1_addr;
> +static void __iomem *elog_addr;
> +
> +static void *elog_buf;
> +
> +static u64 *l1_entry_base;
> +static u32 l1_percpu_entry;
> +
> +#define ELOG_IDX(cpu, bank) \
> +	(cpu_physical_id(cpu) * l1_percpu_entry + (bank))
> +
> +#define ELOG_ENTRY_DATA(idx) \
> +	(*(l1_entry_base + (idx)))
> +
> +#define ELOG_ENTRY_ADDR(phyaddr) \
> +	(phyaddr - elog_base + (u8 *)elog_addr)
> +
> +static struct acpi_generic_status *extlog_elog_entry_check(int cpu, int bank)
> +{
> +	int idx;
> +	u64 data;
> +	struct acpi_generic_status *estatus;
> +
> +	WARN_ON(cpu < 0);
> +	idx = ELOG_IDX(cpu, bank);
> +	data = ELOG_ENTRY_DATA(idx);
> +	if ((data & ELOG_ENTRY_VALID) == 0)
> +		return NULL;
> +
> +	data &= EXT_ELOG_ENTRY_MASK;
> +	estatus = (struct acpi_generic_status *)ELOG_ENTRY_ADDR(data);
> +
> +	/* if no valid data in elog entry, just return */
> +	if (estatus->block_status == 0)
> +		return NULL;
> +
> +	return estatus;
> +}
> +
> +static void __print_extlog_rcd(const char *pfx,
> +			       struct acpi_generic_status *estatus, int cpu)
> +{
> +	static atomic_t seqno;
> +	unsigned int curr_seqno;
> +	char pfx_seq[64];
> +
> +	if (!pfx) {
> +		if (estatus->error_severity <= CPER_SEV_CORRECTED)
> +			pfx = KERN_INFO;
> +		else
> +			pfx = KERN_ERR;
> +	}
> +	curr_seqno = atomic_inc_return(&seqno);
> +	snprintf(pfx_seq, sizeof(pfx_seq), "%s{%u}", pfx, curr_seqno);
> +	printk("%s""Hardware error detected on CPU%d\n", pfx_seq, cpu);
> +	cper_estatus_print(pfx_seq, estatus);
> +}
> +
> +static int print_extlog_rcd(const char *pfx,
> +			    struct acpi_generic_status *estatus, int cpu)
> +{
> +	/* Not more than 2 messages every 5 seconds */
> +	static DEFINE_RATELIMIT_STATE(ratelimit_corrected, 5*HZ, 2);
> +	static DEFINE_RATELIMIT_STATE(ratelimit_uncorrected, 5*HZ, 2);
> +	struct ratelimit_state *ratelimit;
> +
> +	if (estatus->error_severity == CPER_SEV_CORRECTED ||
> +	    (estatus->error_severity == CPER_SEV_INFORMATIONAL))
> +		ratelimit = &ratelimit_corrected;
> +	else
> +		ratelimit = &ratelimit_uncorrected;
> +	if (__ratelimit(ratelimit)) {
> +		__print_extlog_rcd(pfx, estatus, cpu);
> +		return 0;
> +	}
> +
> +	return 1;
> +}
> +
> +static int extlog_print(const char *pfx, int cpu, int bank)
> +{
> +	struct acpi_generic_status *estatus;
> +	int rc;
> +
> +	estatus = extlog_elog_entry_check(cpu, bank);
> +	if (estatus == NULL)
> +		return -EINVAL;
> +
> +	memcpy(elog_buf, (void *)estatus, ELOG_ENTRY_LEN);
> +	/* clear record status to enable BIOS to update it again */
> +	estatus->block_status = 0;
> +
> +	rc = print_extlog_rcd(pfx, (struct acpi_generic_status *)elog_buf, cpu);
> +
> +	return rc;
> +}
> +
> +static int extlog_get_dsm(acpi_handle handle, int rev, int func, u64 *ret)
> +{
> +	struct acpi_buffer buf = {ACPI_ALLOCATE_BUFFER, NULL};
> +	struct acpi_object_list input;
> +	union acpi_object params[4], *obj;
> +	u8 uuid[16];
> +	int i;
> +
> +	acpi_str_to_uuid(extlog_dsm_uuid, uuid);
> +	input.count = 4;
> +	input.pointer = params;
> +	params[0].type = ACPI_TYPE_BUFFER;
> +	params[0].buffer.length = 16;
> +	params[0].buffer.pointer = uuid;
> +	params[1].type = ACPI_TYPE_INTEGER;
> +	params[1].integer.value = rev;
> +	params[2].type = ACPI_TYPE_INTEGER;
> +	params[2].integer.value = func;
> +	params[3].type = ACPI_TYPE_PACKAGE;
> +	params[3].package.count = 0;
> +	params[3].package.elements = NULL;
> +
> +	if (ACPI_FAILURE(acpi_evaluate_object(handle, "_DSM", &input, &buf)))
> +		return -1;
> +
> +	*ret = 0;
> +	obj = (union acpi_object *)buf.pointer;
> +	if (obj->type == ACPI_TYPE_INTEGER) {
> +		*ret = obj->integer.value;
> +	} else if (obj->type == ACPI_TYPE_BUFFER) {
> +		if (obj->buffer.length <= 8) {
> +			for (i = 0; i < obj->buffer.length; i++)
> +				*ret |= (obj->buffer.pointer[i] << (i * 8));
> +		}
> +	}
> +	kfree(buf.pointer);
> +
> +	return 0;
> +}
> +
> +static bool extlog_get_l1addr(void)
> +{
> +	acpi_handle handle;
> +	u64 ret;
> +
> +	if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
> +		return false;
> +
> +	if (extlog_get_dsm(handle, EXTLOG_DSM_REV, EXTLOG_FN_QUERY, &ret) ||
> +	    !(ret & EXTLOG_QUERY_L1_EXIST))
> +		return false;
> +
> +	if (extlog_get_dsm(handle, EXTLOG_DSM_REV, EXTLOG_FN_ADDR, &ret))
> +		return false;
> +
> +	l1_dirbase = ret;
> +	/* Spec says L1 directory must be 4K aligned, bail out if it isn't */
> +	if (l1_dirbase & ((1 << 12) - 1)) {
> +		pr_warn(FW_BUG "L1 Directory is invalid at physical %llx\n",
> +			l1_dirbase);
> +		return false;
> +	}
> +
> +	return true;
> +}
> +
> +static int __init extlog_init(void)
> +{
> +	struct extlog_l1_head *l1_head;
> +	void __iomem *extlog_l1_hdr;
> +	size_t l1_hdr_size;
> +	struct resource *r;
> +	u64 cap;
> +	int rc;
> +
> +	rc = -ENODEV;
> +
> +	rdmsrl(MSR_IA32_MCG_CAP, cap);
> +	if (!(cap & MCG_ELOG_P))
> +		return rc;
> +
> +	if (!extlog_get_l1addr())
> +		return rc;
> +
> +	rc = -EINVAL;
> +	/* get L1 header to fetch necessary information */
> +	l1_hdr_size = sizeof(struct extlog_l1_head);
> +	r = request_mem_region(l1_dirbase, l1_hdr_size, "L1 DIR HDR");
> +	if (!r) {
> +		pr_warn(FW_BUG EMCA_BUG,
> +			(unsigned long long)l1_dirbase,
> +			(unsigned long long)l1_dirbase + l1_hdr_size);
> +		goto err;
> +	}
> +
> +	extlog_l1_hdr = acpi_os_map_memory(l1_dirbase, l1_hdr_size);
> +	l1_head = (struct extlog_l1_head *)extlog_l1_hdr;
> +	l1_size = l1_head->total_len;
> +	l1_percpu_entry = l1_head->entries;
> +	elog_base = l1_head->elog_base;
> +	elog_size = l1_head->elog_len;
> +	acpi_os_unmap_memory(extlog_l1_hdr, l1_hdr_size);
> +	release_mem_region(l1_dirbase, l1_hdr_size);
> +
> +	/* remap L1 header again based on completed information */
> +	r = request_mem_region(l1_dirbase, l1_size, "L1 Table");
> +	if (!r) {
> +		pr_warn(FW_BUG EMCA_BUG,
> +			(unsigned long long)l1_dirbase,
> +			(unsigned long long)l1_dirbase + l1_size);
> +		goto err;
> +	}
> +	extlog_l1_addr = acpi_os_map_memory(l1_dirbase, l1_size);
> +	l1_entry_base = (u64 *)((u8 *)extlog_l1_addr + l1_hdr_size);
> +
> +	/* remap elog table */
> +	r = request_mem_region(elog_base, elog_size, "Elog Table");
> +	if (!r) {
> +		pr_warn(FW_BUG EMCA_BUG,
> +			(unsigned long long)elog_base,
> +			(unsigned long long)elog_base + elog_size);
> +		goto err_release_l1_dir;
> +	}
> +	elog_addr = acpi_os_map_memory(elog_base, elog_size);
> +
> +	rc = -ENOMEM;
> +	/* allocate buffer to save elog record */
> +	elog_buf = kmalloc(ELOG_ENTRY_LEN, GFP_KERNEL);
> +	if (elog_buf == NULL)
> +		goto err_release_elog;
> +
> +	register_elog_handler(extlog_print);
> +	/* enable OS to be involved to take over management from BIOS */
> +	((struct extlog_l1_head *)extlog_l1_addr)->flags |= FLAG_OS_OPTIN;
> +
> +	return 0;
> +
> +err_release_elog:
> +	if (elog_addr)
> +		acpi_os_unmap_memory(elog_addr, elog_size);
> +	release_mem_region(elog_base, elog_size);
> +err_release_l1_dir:
> +	if (extlog_l1_addr)
> +		acpi_os_unmap_memory(extlog_l1_addr, l1_size);
> +	release_mem_region(l1_dirbase, l1_size);
> +err:
> +	pr_warn(FW_BUG "Extended error log disabled because of problems parsing f/w tables\n");
> +	return rc;
> +}
> +
> +static void __exit extlog_exit(void)
> +{
> +	unregister_elog_handler(extlog_print);
> +	((struct extlog_l1_head *)extlog_l1_addr)->flags &= ~FLAG_OS_OPTIN;
> +	if (extlog_l1_addr)
> +		acpi_os_unmap_memory(extlog_l1_addr, l1_size);
> +	if (elog_addr)
> +		acpi_os_unmap_memory(elog_addr, elog_size);
> +	release_mem_region(elog_base, elog_size);
> +	release_mem_region(l1_dirbase, l1_size);
> +	kfree(elog_buf);
> +}
> +
> +module_init(extlog_init);
> +module_exit(extlog_exit);
> +
> +MODULE_AUTHOR("Chen, Gong <gong.chen@intel.com>");
> +MODULE_DESCRIPTION("Extended Error Log Driver");

"Extended MCA Error Log Driver"?

Regards,
Naveen

> +MODULE_LICENSE("GPL");
> diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
> index b587ec8..e1bd9a1 100644
> --- a/drivers/acpi/bus.c
> +++ b/drivers/acpi/bus.c
> @@ -174,7 +174,7 @@ static void acpi_print_osc_error(acpi_handle handle,
>   	printk("\n");
>   }
>
> -static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
> +acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
>   {
>   	int i;
>   	static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
> @@ -195,6 +195,7 @@ static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
>   	}
>   	return AE_OK;
>   }
> +EXPORT_SYMBOL_GPL(acpi_str_to_uuid);
>
>   acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
>   {
> diff --git a/include/linux/acpi.h b/include/linux/acpi.h
> index a5db4ae..c30bac8 100644
> --- a/include/linux/acpi.h
> +++ b/include/linux/acpi.h
> @@ -311,6 +311,7 @@ struct acpi_osc_context {
>   #define OSC_INVALID_REVISION_ERROR	8
>   #define OSC_CAPABILITIES_MASK_ERROR	16
>
> +acpi_status acpi_str_to_uuid(char *str, u8 *uuid);
>   acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context);
>
>   /* platform-wide _OSC bits */
>

Re: [PATCH v3 2/9] ACPI, CPER: Update cper info

[Naveen N. Rao]

On 10/18/2013 01:53 PM, Chen, Gong wrote:
> To prepare for the following patches and make related
> definition more clear, update some definitions about CPER.
>
> v2 -> v1: Update some more definitions suggested by Boris
>
> Signed-off-by: Chen, Gong <gong.chen@linux.intel.com>
> Acked-by: Borislav Petkov <bp@suse.de>
> Reviewed-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
> ---
>   drivers/acpi/apei/apei-internal.h | 12 ++++----
>   drivers/acpi/apei/cper.c          | 58 +++++++++++++++++++--------------------
>   drivers/acpi/apei/ghes.c          | 54 ++++++++++++++++++------------------
>   include/acpi/actbl1.h             | 14 +++++-----
>   include/acpi/ghes.h               |  2 +-
>   include/linux/cper.h              |  2 +-
>   6 files changed, 71 insertions(+), 71 deletions(-)
>
> diff --git a/drivers/acpi/apei/apei-internal.h b/drivers/acpi/apei/apei-internal.h
> index f220d64..21ba34a 100644
> --- a/drivers/acpi/apei/apei-internal.h
> +++ b/drivers/acpi/apei/apei-internal.h
> @@ -122,11 +122,11 @@ struct dentry;
>   struct dentry *apei_get_debugfs_dir(void);
>
>   #define apei_estatus_for_each_section(estatus, section)			\
> -	for (section = (struct acpi_hest_generic_data *)(estatus + 1);	\
> +	for (section = (struct acpi_generic_data *)(estatus + 1);	\
>   	     (void *)section - (void *)estatus < estatus->data_length;	\
>   	     section = (void *)(section+1) + section->error_data_length)
>
> -static inline u32 apei_estatus_len(struct acpi_hest_generic_status *estatus)
> +static inline u32 cper_estatus_len(struct acpi_generic_status *estatus)
>   {
>   	if (estatus->raw_data_length)
>   		return estatus->raw_data_offset + \
> @@ -135,10 +135,10 @@ static inline u32 apei_estatus_len(struct acpi_hest_generic_status *estatus)
>   		return sizeof(*estatus) + estatus->data_length;
>   }
>
> -void apei_estatus_print(const char *pfx,
> -			const struct acpi_hest_generic_status *estatus);
> -int apei_estatus_check_header(const struct acpi_hest_generic_status *estatus);
> -int apei_estatus_check(const struct acpi_hest_generic_status *estatus);
> +void cper_estatus_print(const char *pfx,
> +			const struct acpi_generic_status *estatus);
> +int cper_estatus_check_header(const struct acpi_generic_status *estatus);
> +int cper_estatus_check(const struct acpi_generic_status *estatus);

As stated previously, I am not convinced this makes sense since these 
functions act on ACPI stuctures.

- Naveen

Re: [PATCH v3 4/9] ACPI, x86: Extended error log driver for x86 platform

[Borislav Petkov]

On Fri, Oct 18, 2013 at 06:07:56PM +0530, Naveen N. Rao wrote:
> >@@ -624,6 +641,9 @@ void machine_check_poll(enum mcp_flags flags, mce_banks_t *b)
> >  		    (m.status & (mca_cfg.ser ? MCI_STATUS_S : MCI_STATUS_UC)))
> >  			continue;
> >
> >+		if (mce_ext_err_print)
> >+			mce_ext_err_print(NULL, m.extcpu, i);
> >+
> 
> Can we use the notifier chain we already have:
> mce_register_decode_chain()? EDAC uses this and I'm wondering if it
> is a good fit here. As an added bonus, it seems to honor dont_log_ce
> option as well.

Hmm, that's a good question you raise: but the more important question
is, do you guys - Gong and Tony - want to replace the logging we're
already doing, i.e. mce_log() with extlog or not.

Because if you want to replace the current logging you actually have to
exit machine_check_poll() after having done mce_ext_err_print() so that
the rest of the chain doesn't see the error.

And, does mce_ext_err_print only report DRAM ECC errors or other error
types too?

Btw, if we keep both, then we're going to have two tracepoints -
trace_mce_record() in mce_log() and this one - issuing each a record for
the same event. Which is not really what we want I'd say...

Thanks.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
--

Re: [PATCH v3 0/9] Extended H/W error log driver

[Tony Luck]

On Fri, Oct 18, 2013 at 2:20 AM, Borislav Petkov <bp@alien8.de> wrote:
> It looks ok to me so far, I'm guessing Tony you're picking this up or
> should I?

I'll pick it up.  Thanks for all the Acks & Reviews.

-Tony

RE: [PATCH v3 4/9] ACPI, x86: Extended error log driver for x86 platform

[Luck, Tony]

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> Hmm, that's a good question you raise: but the more important question
> is, do you guys - Gong and Tony - want to replace the logging we're
> already doing, i.e. mce_log() with extlog or not.

Long term ... I'd be happy to see mce_log() go away.  But we need to have
a robust, well tested replacement in place for some time before such a
move is up for discussion.

> Because if you want to replace the current logging you actually have to
> exit machine_check_poll() after having done mce_ext_err_print() so that
> the rest of the chain doesn't see the error.

Yes - double error reporting should be avoided.

> And, does mce_ext_err_print only report DRAM ECC errors or other error
> types too?

Our first platforms to implement this only do so for memory errors.  This
could change in the future (the UEFI appendix N error record has defined
sub-sections for lots of types of errors).

Currently EDAC hooked into the mce even notification chain provides a
return code to indicate whether it completely processed the error, or
whether to fall through to the rest of mce_log():

	if (ret == NOTIFY_STOP)
		return;

Having both EDAC and this new extended error log both registered on this
chain would probably not be helpful in most cases.  Not sure if we should
handle that with user education to not load both an EDAC and ext_log driver
or if there should be some enforcement.

> Btw, if we keep both, then we're going to have two tracepoints -
> trace_mce_record() in mce_log() and this one - issuing each a record for
> the same event. Which is not really what we want I'd say...

trace_mce_record() dumps the raw data from the machine check banks.
I think there may still be a case for having this.  Analysis tools that look at
this trace as well should be smart enough to connect the dots.

-Tony
ÿôèº{.nÇ+‰·Ÿ®‰­†+%ŠËÿ±éݶ\x17¥Šwÿº{.nÇ+‰·¥Š{±þG«éÿŠ{ayº\x1dʇڙë,j\a­¢f£¢·hšïêÿ‘êçz_è®\x03(­éšŽŠÝ¢j"ú\x1a¶^[m§ÿÿ¾\a«þG«éÿ¢¸?™¨è­Ú&£ø§~á¶iO•æ¬z·švØ^\x14\x04\x1a¶^[m§ÿÿÃ\fÿ¶ìÿ¢¸?–I¥

Re: [PATCH v3 4/9] ACPI, x86: Extended error log driver for x86 platform

[Borislav Petkov]

On Fri, Oct 18, 2013 at 08:57:22PM +0000, Luck, Tony wrote:
> Long term ... I'd be happy to see mce_log() go away. But we need to
> have a robust, well tested replacement in place for some time before
> such a move is up for discussion.

Basically a userspace daemon consuming the tracepoint or plural,
tracepoints.

> Yes - double error reporting should be avoided.

Right.

> Our first platforms to implement this only do so for memory errors.
> This could change in the future (the UEFI appendix N error record has
> defined sub-sections for lots of types of errors).

Ok.

> Currently EDAC hooked into the mce even notification chain provides a
> return code to indicate whether it completely processed the error, or
> whether to fall through to the rest of mce_log():
> 
> 	if (ret == NOTIFY_STOP)
> 		return;
> 
> Having both EDAC and this new extended error log both registered on this
> chain would probably not be helpful in most cases.

Not only that - you don't need EDAC because all the information is in
the MCA registers and the eMCA supplement, if there is one.

EDAC would be used on older systems which don't sport eMCA.

Now, concerning the current situation, we probably want to do something
like this:

diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index b1b04123f3d9..382c78eaf474 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -154,6 +154,10 @@ void mce_log(struct mce *mce)
 	/* Emit the trace record: */
 	trace_mce_record(mce);
 
+	if (mce_ext_err_print)
+		if (mce_ext_err_print(NULL, m.extcpu, i))
+			return;
+
 	ret = atomic_notifier_call_chain(&x86_mce_decoder_chain, 0, mce);
 	if (ret == NOTIFY_STOP)
 		return;
--

Right, we've moved the eMCA print thingie to mce_log so that we get a
chance to run the first TP issuing the raw MCA registers and then run
the eMCA TP as a follow-up.

We've taught mce_ext_err_print() to return a true/false retval to denote:

* true: it has collected data successfully, no need to go down the reporting
  chain

* false: eMCA failed somehow, log the error down and trigger mcelog in
  userspace.

How does that sound?

> Not sure if we should handle that with user education to not load both
> an EDAC and ext_log driver or if there should be some enforcement.

Definitely enforcement. The flags thing I was telling you about recently
could be one way to do it.

> trace_mce_record() dumps the raw data from the machine check banks. I
> think there may still be a case for having this. Analysis tools that
> look at this trace as well should be smart enough to connect the dots.

Yes, sure. The more non-overlaping data we get, the better.

Thanks.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
--

RE: [PATCH v3 4/9] ACPI, x86: Extended error log driver for x86 platform

[Luck, Tony]

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@@ -154,6 +154,10 @@ void mce_log(struct mce *mce)
 	/* Emit the trace record: */
 	trace_mce_record(mce);
 
+	if (mce_ext_err_print)
+		if (mce_ext_err_print(NULL, m.extcpu, i))
+			return;
+
 	ret = atomic_notifier_call_chain(&x86_mce_decoder_chain, 0, mce);
 	if (ret == NOTIFY_STOP)
 		return;

If we move mce_ext_err_print() this far ... then it's only one line further down
to have it be part of the x86_mce_decoder_chain as suggested by Naveen.

-Tony
ÿôèº{.nÇ+‰·Ÿ®‰­†+%ŠËÿ±éݶ\x17¥Šwÿº{.nÇ+‰·¥Š{±þG«éÿŠ{ayº\x1dʇڙë,j\a­¢f£¢·hšïêÿ‘êçz_è®\x03(­éšŽŠÝ¢j"ú\x1a¶^[m§ÿÿ¾\a«þG«éÿ¢¸?™¨è­Ú&£ø§~á¶iO•æ¬z·švØ^\x14\x04\x1a¶^[m§ÿÿÃ\fÿ¶ìÿ¢¸?–I¥

Re: [PATCH v3 4/9] ACPI, x86: Extended error log driver for x86 platform

[Borislav Petkov]

On Fri, Oct 18, 2013 at 10:22:26PM +0000, Luck, Tony wrote:
> @@ -154,6 +154,10 @@ void mce_log(struct mce *mce)
>  	/* Emit the trace record: */
>  	trace_mce_record(mce);
>  
> +	if (mce_ext_err_print)
> +		if (mce_ext_err_print(NULL, m.extcpu, i))
> +			return;
> +
>  	ret = atomic_notifier_call_chain(&x86_mce_decoder_chain, 0, mce);
>  	if (ret == NOTIFY_STOP)
>  		return;
> 
> If we move mce_ext_err_print() this far ... then it's only one line further down
> to have it be part of the x86_mce_decoder_chain as suggested by Naveen.

Right, if you want mce_ext_err_print() to be the first and the only one
called on the chain, then you'd have to play with the priority.

But yes, this is possible and it would make it all even cleaner
and simpler by simply not needing the reg/dereg interfaces for
mce_ext_err_print but adding it to the chain.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
--

Re: [PATCH v3 8/9] ACPI, APEI, CPER: Cleanup CPER memory error output format

[Chen Gong]

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On Fri, Oct 18, 2013 at 05:31:21PM +0530, Naveen N. Rao wrote:
> Date: Fri, 18 Oct 2013 17:31:21 +0530
> From: "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>
> To: "Chen, Gong" <gong.chen@linux.intel.com>, tony.luck@intel.com,
>  bp@alien8.de, joe@perches.com, m.chehab@samsung.com
> CC: arozansk@redhat.com, linux-acpi@vger.kernel.org,
>  linux-kernel@vger.kernel.org
> Subject: Re: [PATCH v3 8/9] ACPI, APEI, CPER: Cleanup CPER memory error
>  output format
> User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101
>  Thunderbird/24.0
> 
[...]
> >
> >@@ -358,17 +349,21 @@ void cper_estatus_print(const char *pfx,
> >  	struct acpi_generic_data *gdata;
> >  	unsigned int data_len, gedata_len;
> >  	int sec_no = 0;
> >+	char newpfx[64];
> >  	__u16 severity;
> >
> >-	printk("%s""Generic Hardware Error Status\n", pfx);
> >  	severity = estatus->error_severity;
> >-	printk("%s""severity: %d, %s\n", pfx, severity,
> >-	       cper_severity_str(severity));
> >+	if (severity != CPER_SEV_FATAL)
> 
> Shouldn't this just be (severity == CPER_SEV_CORRECTED)?
> 
> Thanks,
> Naveen
> 
IMO, only fatal error can't be handlered gracefully in current
kernel plus H/W. Once it can be recovered by H/W and OS, we
can call it recovered.

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Re: [PATCH v3 4/9] ACPI, x86: Extended error log driver for x86 platform

[Chen Gong]

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On Fri, Oct 18, 2013 at 06:07:56PM +0530, Naveen N. Rao wrote:
> Date: Fri, 18 Oct 2013 18:07:56 +0530
> From: "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>
> To: "Chen, Gong" <gong.chen@linux.intel.com>, tony.luck@intel.com,
>  bp@alien8.de, joe@perches.com, m.chehab@samsung.com
> CC: arozansk@redhat.com, linux-acpi@vger.kernel.org,
>  linux-kernel@vger.kernel.org
> Subject: Re: [PATCH v3 4/9] ACPI, x86: Extended error log driver for x86
>  platform
> User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101
>  Thunderbird/24.0
> 
[...]
> >+
> >+MODULE_AUTHOR("Chen, Gong <gong.chen@intel.com>");
> >+MODULE_DESCRIPTION("Extended Error Log Driver");
> 
> "Extended MCA Error Log Driver"?
> 

Looks fine to me. Tony, would you please help to fix it when you pick up the
patch? Thanks in advance!

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Re: [PATCH v3 4/9] ACPI, x86: Extended error log driver for x86 platform

[Chen Gong]

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[...]

> >diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
> >index 22327e6..c67ec61 100644
> >--- a/drivers/acpi/Kconfig
> >+++ b/drivers/acpi/Kconfig
> >@@ -372,4 +372,24 @@ config ACPI_BGRT
> >
> >  source "drivers/acpi/apei/Kconfig"
> >
> >+config ACPI_EXTLOG
> >+	tristate "Extended Error Log support"
> >+	depends on X86_MCE
> 
> I think you also have a dependancy on ACPI_APEI for apei_estatus_print()
> 
Oh, yes it is. Furthermore, it reminds me where is the best place to put
cper.c from I write this patch series. CPER really doesn't dpend on APEI
even ACPI. Maybe lib/ ia an option. I can update this patch and if it is
OK, I can add another separate patch to change this dependency. Make
sense?

> >+	default n
> >+	help
> >+	  Certain usages such as Predictive Failure Analysis (PFA) require
> >+	  more information about the error than what can be described in
> >+	  processor machine check banks. Most server processors log
> >+	  additional information about the error in processor uncore
> >+	  registers. Since the addresses and layout of these registers vary
> >+	  widely from one processor to another, system software cannot
> >+	  readily make use of them. To complicate matters further, some of
> >+	  the additional error information cannot be constructed space
> >+	  between "additional" and "error" without detailed knowledge
> 
> Oops... looks like copy+paste went wrong ;)
> 
Sigh, it looks like I have m a little bit hurry. 

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[PATCH V4 4/9] ACPI, x86: Extended error log driver for x86 platform

[Chen, Gong]

This H/W error log driver (a.k.a eMCA driver) is implemented based on
http://www.intel.com/content/www/us/en/architecture-and-technology/enhanced-mca-logging-xeon-paper.html

After errors are captured, more valuable information can be
got via this new enhanced H/W error log driver.

v4 -> v3: update description info & Kconfig suggested by Naveen
v3 -> v2: fix a MACRO definition error and some cleanup
v2 -> v1: eliminate spin_lock & minor fixes suggested by Boris

Signed-off-by: Chen, Gong <gong.chen@linux.intel.com>
---
 arch/x86/include/asm/mce.h       |   5 +
 arch/x86/kernel/cpu/mcheck/mce.c |  20 +++
 drivers/acpi/Kconfig             |  19 +++
 drivers/acpi/Makefile            |   2 +
 drivers/acpi/acpi_extlog.c       | 319 +++++++++++++++++++++++++++++++++++++++
 drivers/acpi/bus.c               |   3 +-
 include/linux/acpi.h             |   1 +
 7 files changed, 368 insertions(+), 1 deletion(-)
 create mode 100644 drivers/acpi/acpi_extlog.c

diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h
index cbe6b9e..072b2f8 100644
--- a/arch/x86/include/asm/mce.h
+++ b/arch/x86/include/asm/mce.h
@@ -16,6 +16,7 @@
 #define MCG_EXT_CNT_SHIFT	16
 #define MCG_EXT_CNT(c)		(((c) & MCG_EXT_CNT_MASK) >> MCG_EXT_CNT_SHIFT)
 #define MCG_SER_P		(1ULL<<24)   /* MCA recovery/new status bits */
+#define MCG_ELOG_P		(1ULL<<26)   /* Extended error log supported */
 
 /* MCG_STATUS register defines */
 #define MCG_STATUS_RIPV  (1ULL<<0)   /* restart ip valid */
@@ -186,6 +187,10 @@ enum mcp_flags {
 	MCP_UC = (1 << 1),		/* log uncorrected errors */
 	MCP_DONTLOG = (1 << 2),		/* only clear, don't log */
 };
+
+void register_elog_handler(int (*f)(const char *, int, int));
+void unregister_elog_handler(int (*f)(const char *, int, int));
+
 void machine_check_poll(enum mcp_flags flags, mce_banks_t *b);
 
 int mce_notify_irq(void);
diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index b3218cd..981e0d3 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -48,6 +48,8 @@
 
 #include "mce-internal.h"
 
+static int (*mce_ext_err_print)(const char *, int, int);
+
 static DEFINE_MUTEX(mce_chrdev_read_mutex);
 
 #define rcu_dereference_check_mce(p) \
@@ -576,6 +578,21 @@ static void mce_read_aux(struct mce *m, int i)
 
 DEFINE_PER_CPU(unsigned, mce_poll_count);
 
+void register_elog_handler(int (*f)(const char *, int, int))
+{
+	mce_ext_err_print = f;
+}
+EXPORT_SYMBOL_GPL(register_elog_handler);
+
+void unregister_elog_handler(int (*f)(const char *, int, int))
+{
+	if (f) {
+		WARN_ON(mce_ext_err_print != f);
+		mce_ext_err_print = NULL;
+	}
+}
+EXPORT_SYMBOL_GPL(unregister_elog_handler);
+
 /*
  * Poll for corrected events or events that happened before reset.
  * Those are just logged through /dev/mcelog.
@@ -624,6 +641,9 @@ void machine_check_poll(enum mcp_flags flags, mce_banks_t *b)
 		    (m.status & (mca_cfg.ser ? MCI_STATUS_S : MCI_STATUS_UC)))
 			continue;
 
+		if (mce_ext_err_print)
+			mce_ext_err_print(NULL, m.extcpu, i);
+
 		mce_read_aux(&m, i);
 
 		if (!(flags & MCP_TIMESTAMP))
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 22327e6..42ef439 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -372,4 +372,23 @@ config ACPI_BGRT
 
 source "drivers/acpi/apei/Kconfig"
 
+config ACPI_EXTLOG
+	tristate "Extended Error Log support"
+	depends on X86_MCE && ACPI_APEI
+	default n
+	help
+	  Certain usages such as Predictive Failure Analysis (PFA) require
+	  more information about the error than what can be described in
+	  processor machine check banks. Most server processors log
+	  additional information about the error in processor uncore
+	  registers. Since the addresses and layout of these registers vary
+	  widely from one processor to another, system software cannot
+	  readily make use of them. To complicate matters further, some of
+	  the additional error information cannot be constructed without
+	  detailed knowledge about platform topology.
+
+	  Enhanced MCA Logging allows firmware to provide additional error
+	  information to system software, synchronous with MCE or CMCI. This
+	  driver adds support for that functionality.
+
 endif	# ACPI
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index cdaf68b..bce34af 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -82,3 +82,5 @@ processor-$(CONFIG_CPU_FREQ)	+= processor_perflib.o
 obj-$(CONFIG_ACPI_PROCESSOR_AGGREGATOR) += acpi_pad.o
 
 obj-$(CONFIG_ACPI_APEI)		+= apei/
+
+obj-$(CONFIG_ACPI_EXTLOG)	+= acpi_extlog.o
diff --git a/drivers/acpi/acpi_extlog.c b/drivers/acpi/acpi_extlog.c
new file mode 100644
index 0000000..1bc657d
--- /dev/null
+++ b/drivers/acpi/acpi_extlog.c
@@ -0,0 +1,319 @@
+/*
+ * Extended Error Log driver
+ *
+ * Copyright (C) 2013 Intel Corp.
+ * Author: Chen, Gong <gong.chen@intel.com>
+ *
+ * This file is licensed under GPLv2.
+ */
+
+#include <linux/module.h>
+#include <linux/acpi.h>
+#include <acpi/acpi_bus.h>
+#include <linux/cper.h>
+#include <linux/ratelimit.h>
+#include <asm/mce.h>
+
+#include "apei/apei-internal.h"
+
+#define EXT_ELOG_ENTRY_MASK	GENMASK_ULL(51, 0) /* elog entry address mask */
+
+#define EXTLOG_DSM_REV		0x0
+#define	EXTLOG_FN_QUERY		0x0
+#define	EXTLOG_FN_ADDR		0x1
+
+#define FLAG_OS_OPTIN		BIT(0)
+#define EXTLOG_QUERY_L1_EXIST	BIT(1)
+#define ELOG_ENTRY_VALID	(1ULL<<63)
+#define ELOG_ENTRY_LEN		0x1000
+
+#define EMCA_BUG \
+	"Can not request iomem region <0x%016llx-0x%016llx> - eMCA disabled\n"
+
+struct extlog_l1_head {
+	u32 ver;	/* Header Version */
+	u32 hdr_len;	/* Header Length */
+	u64 total_len;	/* entire L1 Directory length including this header */
+	u64 elog_base;	/* MCA Error Log Directory base address */
+	u64 elog_len;	/* MCA Error Log Directory length */
+	u32 flags;	/* bit 0 - OS/VMM Opt-in */
+	u8  rev0[12];
+	u32 entries;	/* Valid L1 Directory entries per logical processor */
+	u8  rev1[12];
+};
+
+static u8 extlog_dsm_uuid[] = "663E35AF-CC10-41A4-88EA-5470AF055295";
+
+/* L1 table related physical address */
+static u64 elog_base;
+static size_t elog_size;
+static u64 l1_dirbase;
+static size_t l1_size;
+
+/* L1 table related virtual address */
+static void __iomem *extlog_l1_addr;
+static void __iomem *elog_addr;
+
+static void *elog_buf;
+
+static u64 *l1_entry_base;
+static u32 l1_percpu_entry;
+
+#define ELOG_IDX(cpu, bank) \
+	(cpu_physical_id(cpu) * l1_percpu_entry + (bank))
+
+#define ELOG_ENTRY_DATA(idx) \
+	(*(l1_entry_base + (idx)))
+
+#define ELOG_ENTRY_ADDR(phyaddr) \
+	(phyaddr - elog_base + (u8 *)elog_addr)
+
+static struct acpi_generic_status *extlog_elog_entry_check(int cpu, int bank)
+{
+	int idx;
+	u64 data;
+	struct acpi_generic_status *estatus;
+
+	WARN_ON(cpu < 0);
+	idx = ELOG_IDX(cpu, bank);
+	data = ELOG_ENTRY_DATA(idx);
+	if ((data & ELOG_ENTRY_VALID) == 0)
+		return NULL;
+
+	data &= EXT_ELOG_ENTRY_MASK;
+	estatus = (struct acpi_generic_status *)ELOG_ENTRY_ADDR(data);
+
+	/* if no valid data in elog entry, just return */
+	if (estatus->block_status == 0)
+		return NULL;
+
+	return estatus;
+}
+
+static void __print_extlog_rcd(const char *pfx,
+			       struct acpi_generic_status *estatus, int cpu)
+{
+	static atomic_t seqno;
+	unsigned int curr_seqno;
+	char pfx_seq[64];
+
+	if (!pfx) {
+		if (estatus->error_severity <= CPER_SEV_CORRECTED)
+			pfx = KERN_INFO;
+		else
+			pfx = KERN_ERR;
+	}
+	curr_seqno = atomic_inc_return(&seqno);
+	snprintf(pfx_seq, sizeof(pfx_seq), "%s{%u}", pfx, curr_seqno);
+	printk("%s""Hardware error detected on CPU%d\n", pfx_seq, cpu);
+	cper_estatus_print(pfx_seq, estatus);
+}
+
+static int print_extlog_rcd(const char *pfx,
+			    struct acpi_generic_status *estatus, int cpu)
+{
+	/* Not more than 2 messages every 5 seconds */
+	static DEFINE_RATELIMIT_STATE(ratelimit_corrected, 5*HZ, 2);
+	static DEFINE_RATELIMIT_STATE(ratelimit_uncorrected, 5*HZ, 2);
+	struct ratelimit_state *ratelimit;
+
+	if (estatus->error_severity == CPER_SEV_CORRECTED ||
+	    (estatus->error_severity == CPER_SEV_INFORMATIONAL))
+		ratelimit = &ratelimit_corrected;
+	else
+		ratelimit = &ratelimit_uncorrected;
+	if (__ratelimit(ratelimit)) {
+		__print_extlog_rcd(pfx, estatus, cpu);
+		return 0;
+	}
+
+	return 1;
+}
+
+static int extlog_print(const char *pfx, int cpu, int bank)
+{
+	struct acpi_generic_status *estatus;
+	int rc;
+
+	estatus = extlog_elog_entry_check(cpu, bank);
+	if (estatus == NULL)
+		return -EINVAL;
+
+	memcpy(elog_buf, (void *)estatus, ELOG_ENTRY_LEN);
+	/* clear record status to enable BIOS to update it again */
+	estatus->block_status = 0;
+
+	rc = print_extlog_rcd(pfx, (struct acpi_generic_status *)elog_buf, cpu);
+
+	return rc;
+}
+
+static int extlog_get_dsm(acpi_handle handle, int rev, int func, u64 *ret)
+{
+	struct acpi_buffer buf = {ACPI_ALLOCATE_BUFFER, NULL};
+	struct acpi_object_list input;
+	union acpi_object params[4], *obj;
+	u8 uuid[16];
+	int i;
+
+	acpi_str_to_uuid(extlog_dsm_uuid, uuid);
+	input.count = 4;
+	input.pointer = params;
+	params[0].type = ACPI_TYPE_BUFFER;
+	params[0].buffer.length = 16;
+	params[0].buffer.pointer = uuid;
+	params[1].type = ACPI_TYPE_INTEGER;
+	params[1].integer.value = rev;
+	params[2].type = ACPI_TYPE_INTEGER;
+	params[2].integer.value = func;
+	params[3].type = ACPI_TYPE_PACKAGE;
+	params[3].package.count = 0;
+	params[3].package.elements = NULL;
+
+	if (ACPI_FAILURE(acpi_evaluate_object(handle, "_DSM", &input, &buf)))
+		return -1;
+
+	*ret = 0;
+	obj = (union acpi_object *)buf.pointer;
+	if (obj->type == ACPI_TYPE_INTEGER) {
+		*ret = obj->integer.value;
+	} else if (obj->type == ACPI_TYPE_BUFFER) {
+		if (obj->buffer.length <= 8) {
+			for (i = 0; i < obj->buffer.length; i++)
+				*ret |= (obj->buffer.pointer[i] << (i * 8));
+		}
+	}
+	kfree(buf.pointer);
+
+	return 0;
+}
+
+static bool extlog_get_l1addr(void)
+{
+	acpi_handle handle;
+	u64 ret;
+
+	if (ACPI_FAILURE(acpi_get_handle(NULL, "\\_SB", &handle)))
+		return false;
+
+	if (extlog_get_dsm(handle, EXTLOG_DSM_REV, EXTLOG_FN_QUERY, &ret) ||
+	    !(ret & EXTLOG_QUERY_L1_EXIST))
+		return false;
+
+	if (extlog_get_dsm(handle, EXTLOG_DSM_REV, EXTLOG_FN_ADDR, &ret))
+		return false;
+
+	l1_dirbase = ret;
+	/* Spec says L1 directory must be 4K aligned, bail out if it isn't */
+	if (l1_dirbase & ((1 << 12) - 1)) {
+		pr_warn(FW_BUG "L1 Directory is invalid at physical %llx\n",
+			l1_dirbase);
+		return false;
+	}
+
+	return true;
+}
+
+static int __init extlog_init(void)
+{
+	struct extlog_l1_head *l1_head;
+	void __iomem *extlog_l1_hdr;
+	size_t l1_hdr_size;
+	struct resource *r;
+	u64 cap;
+	int rc;
+
+	rc = -ENODEV;
+
+	rdmsrl(MSR_IA32_MCG_CAP, cap);
+	if (!(cap & MCG_ELOG_P))
+		return rc;
+
+	if (!extlog_get_l1addr())
+		return rc;
+
+	rc = -EINVAL;
+	/* get L1 header to fetch necessary information */
+	l1_hdr_size = sizeof(struct extlog_l1_head);
+	r = request_mem_region(l1_dirbase, l1_hdr_size, "L1 DIR HDR");
+	if (!r) {
+		pr_warn(FW_BUG EMCA_BUG,
+			(unsigned long long)l1_dirbase,
+			(unsigned long long)l1_dirbase + l1_hdr_size);
+		goto err;
+	}
+
+	extlog_l1_hdr = acpi_os_map_memory(l1_dirbase, l1_hdr_size);
+	l1_head = (struct extlog_l1_head *)extlog_l1_hdr;
+	l1_size = l1_head->total_len;
+	l1_percpu_entry = l1_head->entries;
+	elog_base = l1_head->elog_base;
+	elog_size = l1_head->elog_len;
+	acpi_os_unmap_memory(extlog_l1_hdr, l1_hdr_size);
+	release_mem_region(l1_dirbase, l1_hdr_size);
+
+	/* remap L1 header again based on completed information */
+	r = request_mem_region(l1_dirbase, l1_size, "L1 Table");
+	if (!r) {
+		pr_warn(FW_BUG EMCA_BUG,
+			(unsigned long long)l1_dirbase,
+			(unsigned long long)l1_dirbase + l1_size);
+		goto err;
+	}
+	extlog_l1_addr = acpi_os_map_memory(l1_dirbase, l1_size);
+	l1_entry_base = (u64 *)((u8 *)extlog_l1_addr + l1_hdr_size);
+
+	/* remap elog table */
+	r = request_mem_region(elog_base, elog_size, "Elog Table");
+	if (!r) {
+		pr_warn(FW_BUG EMCA_BUG,
+			(unsigned long long)elog_base,
+			(unsigned long long)elog_base + elog_size);
+		goto err_release_l1_dir;
+	}
+	elog_addr = acpi_os_map_memory(elog_base, elog_size);
+
+	rc = -ENOMEM;
+	/* allocate buffer to save elog record */
+	elog_buf = kmalloc(ELOG_ENTRY_LEN, GFP_KERNEL);
+	if (elog_buf == NULL)
+		goto err_release_elog;
+
+	register_elog_handler(extlog_print);
+	/* enable OS to be involved to take over management from BIOS */
+	((struct extlog_l1_head *)extlog_l1_addr)->flags |= FLAG_OS_OPTIN;
+
+	return 0;
+
+err_release_elog:
+	if (elog_addr)
+		acpi_os_unmap_memory(elog_addr, elog_size);
+	release_mem_region(elog_base, elog_size);
+err_release_l1_dir:
+	if (extlog_l1_addr)
+		acpi_os_unmap_memory(extlog_l1_addr, l1_size);
+	release_mem_region(l1_dirbase, l1_size);
+err:
+	pr_warn(FW_BUG "Extended error log disabled because of problems parsing f/w tables\n");
+	return rc;
+}
+
+static void __exit extlog_exit(void)
+{
+	unregister_elog_handler(extlog_print);
+	((struct extlog_l1_head *)extlog_l1_addr)->flags &= ~FLAG_OS_OPTIN;
+	if (extlog_l1_addr)
+		acpi_os_unmap_memory(extlog_l1_addr, l1_size);
+	if (elog_addr)
+		acpi_os_unmap_memory(elog_addr, elog_size);
+	release_mem_region(elog_base, elog_size);
+	release_mem_region(l1_dirbase, l1_size);
+	kfree(elog_buf);
+}
+
+module_init(extlog_init);
+module_exit(extlog_exit);
+
+MODULE_AUTHOR("Chen, Gong <gong.chen@intel.com>");
+MODULE_DESCRIPTION("Extended MCA Error Log Driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
index b587ec8..e1bd9a1 100644
--- a/drivers/acpi/bus.c
+++ b/drivers/acpi/bus.c
@@ -174,7 +174,7 @@ static void acpi_print_osc_error(acpi_handle handle,
 	printk("\n");
 }
 
-static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
+acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
 {
 	int i;
 	static int opc_map_to_uuid[16] = {6, 4, 2, 0, 11, 9, 16, 14, 19, 21,
@@ -195,6 +195,7 @@ static acpi_status acpi_str_to_uuid(char *str, u8 *uuid)
 	}
 	return AE_OK;
 }
+EXPORT_SYMBOL_GPL(acpi_str_to_uuid);
 
 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context)
 {
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index a5db4ae..c30bac8 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -311,6 +311,7 @@ struct acpi_osc_context {
 #define OSC_INVALID_REVISION_ERROR	8
 #define OSC_CAPABILITIES_MASK_ERROR	16
 
+acpi_status acpi_str_to_uuid(char *str, u8 *uuid);
 acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context);
 
 /* platform-wide _OSC bits */
-- 
1.8.4.rc3

Re: [PATCH v3 4/9] ACPI, x86: Extended error log driver for x86 platform

[Borislav Petkov]

Btw, your mailer is generating that Mail-Followup-To header which
removes you from the To: list and puts everyone else on To: instead.

And of course, the patches you've sent with git-send-email don't have
that header and replying to all there is fine.

And Tony's replies don't have it so replying to him is fine.

>From reading this here: http://cr.yp.to/proto/replyto.html your mail
client seems to think you're subscribed to some list and thus drops your
mail address from Mail-Followup-To.

On Sun, Oct 20, 2013 at 03:06:15AM -0400, Chen Gong wrote:
> Oh, yes it is. Furthermore, it reminds me where is the best place
> to put cper.c from I write this patch series. CPER really doesn't
> dpend on APEI even ACPI. Maybe lib/ ia an option. I can update this
> patch and if it is OK, I can add another separate patch to change this
> dependency. Make sense?

Yeah, for some reason it is part of the UEFI spec but APEI uses it too.

Well, I guess you can add it there as "default n" and have the rest of
the code select it in Kconfig.

> Sigh, it looks like I have m a little bit hurry.

Yeah, why is that? :-)

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
--

Re: [PATCH v3 8/9] ACPI, APEI, CPER: Cleanup CPER memory error output format

[Naveen N. Rao]

On 10/19/2013 04:56 PM, Chen Gong wrote:
> On Fri, Oct 18, 2013 at 05:31:21PM +0530, Naveen N. Rao wrote:
>> Date: Fri, 18 Oct 2013 17:31:21 +0530
>> From: "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>
>> To: "Chen, Gong" <gong.chen@linux.intel.com>, tony.luck@intel.com,
>>   bp@alien8.de, joe@perches.com, m.chehab@samsung.com
>> CC: arozansk@redhat.com, linux-acpi@vger.kernel.org,
>>   linux-kernel@vger.kernel.org
>> Subject: Re: [PATCH v3 8/9] ACPI, APEI, CPER: Cleanup CPER memory error
>>   output format
>> User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101
>>   Thunderbird/24.0
>>
> [...]
>>>
>>> @@ -358,17 +349,21 @@ void cper_estatus_print(const char *pfx,
>>>   	struct acpi_generic_data *gdata;
>>>   	unsigned int data_len, gedata_len;
>>>   	int sec_no = 0;
>>> +	char newpfx[64];
>>>   	__u16 severity;
>>>
>>> -	printk("%s""Generic Hardware Error Status\n", pfx);
>>>   	severity = estatus->error_severity;
>>> -	printk("%s""severity: %d, %s\n", pfx, severity,
>>> -	       cper_severity_str(severity));
>>> +	if (severity != CPER_SEV_FATAL)
>>
>> Shouldn't this just be (severity == CPER_SEV_CORRECTED)?
>>
>> Thanks,
>> Naveen
>>
> IMO, only fatal error can't be handlered gracefully in current
> kernel plus H/W. Once it can be recovered by H/W and OS, we
> can call it recovered.
>

Sure, but we don't recover in all scenarios. So, calling it corrected 
seems incorrect to me.



- Naveen

Re: [PATCH v3 4/9] ACPI, x86: Extended error log driver for x86 platform

[Naveen N. Rao]

On 10/20/2013 01:51 PM, Borislav Petkov wrote:
> On Sun, Oct 20, 2013 at 03:06:15AM -0400, Chen Gong wrote:
>> Oh, yes it is. Furthermore, it reminds me where is the best place
>> to put cper.c from I write this patch series. CPER really doesn't
>> dpend on APEI even ACPI. Maybe lib/ ia an option. I can update this
>> patch and if it is OK, I can add another separate patch to change this
>> dependency. Make sense?
>
> Yeah, for some reason it is part of the UEFI spec but APEI uses it too.
>
> Well, I guess you can add it there as "default n" and have the rest of
> the code select it in Kconfig.

Yup, I think that would be a good idea to just separate out the CPER 
stuff from the APEI code, though I think your enhanced MCA logging code 
will need to depend on both CPER and ACPI since you use the ACPI 
structures as well.


Thanks,
Naveen

RE: [PATCH v3 8/9] ACPI, APEI, CPER: Cleanup CPER memory error output format

[Luck, Tony]

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain; charset="utf-8", Size: 1045 bytes --]

>>>> +	if (severity != CPER_SEV_FATAL)
>>>
>>> Shouldn't this just be (severity == CPER_SEV_CORRECTED)?


>> IMO, only fatal error can't be handlered gracefully in current
>> kernel plus H/W. Once it can be recovered by H/W and OS, we
>> can call it recovered.

> Sure, but we don't recover in all scenarios. So, calling it corrected 
> seems incorrect to me.

Even if we recovered from a UC error (which is by no means a sure
thing) ... I don't think the "requires no further action" message applies.

Soft single bit errors are common (well, common-ish ... they should still
be somewhat rare by most objective standard).  Double bit errors are
much rarer ... and are very unlikely to be the result of two single bit errors
happening to be inside the same cache line.  I'd recommend further investigation
of the source of a UC error (even one that is "recovered" in software).

-Tony
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Re: [PATCH v3 4/9] ACPI, x86: Extended error log driver for x86 platform

[Luck, Tony]

> But yes, this is possible and it would make it all even cleaner
> and simpler by simply not needing the reg/dereg interfaces for
> mce_ext_err_print but adding it to the chain.

So this is on top of the 9 patch series (using the V4 that Chen Gong
posted for part 4/9 and V3 for all the others).  Obviously it should
be folded back into the series if we go this way.

It's a bit simplistic right now - the registered function just returns
NOTIFY_DONE in all cases so it will not disturb processing by any other
registered functions - we can make it smarter later.

-Tony

---

diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h
index 072b2f80a345..8b8e72522737 100644
--- a/arch/x86/include/asm/mce.h
+++ b/arch/x86/include/asm/mce.h
@@ -188,9 +188,6 @@ enum mcp_flags {
 	MCP_DONTLOG = (1 << 2),		/* only clear, don't log */
 };
 
-void register_elog_handler(int (*f)(const char *, int, int));
-void unregister_elog_handler(int (*f)(const char *, int, int));
-
 void machine_check_poll(enum mcp_flags flags, mce_banks_t *b);
 
 int mce_notify_irq(void);
diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 981e0d3ed49d..b3218cdee95f 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -48,8 +48,6 @@
 
 #include "mce-internal.h"
 
-static int (*mce_ext_err_print)(const char *, int, int);
-
 static DEFINE_MUTEX(mce_chrdev_read_mutex);
 
 #define rcu_dereference_check_mce(p) \
@@ -578,21 +576,6 @@ static void mce_read_aux(struct mce *m, int i)
 
 DEFINE_PER_CPU(unsigned, mce_poll_count);
 
-void register_elog_handler(int (*f)(const char *, int, int))
-{
-	mce_ext_err_print = f;
-}
-EXPORT_SYMBOL_GPL(register_elog_handler);
-
-void unregister_elog_handler(int (*f)(const char *, int, int))
-{
-	if (f) {
-		WARN_ON(mce_ext_err_print != f);
-		mce_ext_err_print = NULL;
-	}
-}
-EXPORT_SYMBOL_GPL(unregister_elog_handler);
-
 /*
  * Poll for corrected events or events that happened before reset.
  * Those are just logged through /dev/mcelog.
@@ -641,9 +624,6 @@ void machine_check_poll(enum mcp_flags flags, mce_banks_t *b)
 		    (m.status & (mca_cfg.ser ? MCI_STATUS_S : MCI_STATUS_UC)))
 			continue;
 
-		if (mce_ext_err_print)
-			mce_ext_err_print(NULL, m.extcpu, i);
-
 		mce_read_aux(&m, i);
 
 		if (!(flags & MCP_TIMESTAMP))
diff --git a/drivers/acpi/acpi_extlog.c b/drivers/acpi/acpi_extlog.c
index 1bc657d3d053..eb0d7792ecc1 100644
--- a/drivers/acpi/acpi_extlog.c
+++ b/drivers/acpi/acpi_extlog.c
@@ -130,22 +130,26 @@ static int print_extlog_rcd(const char *pfx,
 	return 1;
 }
 
-static int extlog_print(const char *pfx, int cpu, int bank)
+static int extlog_print(struct notifier_block *nb, unsigned long val,
+			void *data)
 {
+	struct mce *mce = (struct mce *)data;
+	int	bank = mce->bank;
+	int	cpu = mce->extcpu;
 	struct acpi_generic_status *estatus;
 	int rc;
 
 	estatus = extlog_elog_entry_check(cpu, bank);
 	if (estatus == NULL)
-		return -EINVAL;
+		return NOTIFY_DONE;
 
 	memcpy(elog_buf, (void *)estatus, ELOG_ENTRY_LEN);
 	/* clear record status to enable BIOS to update it again */
 	estatus->block_status = 0;
 
-	rc = print_extlog_rcd(pfx, (struct acpi_generic_status *)elog_buf, cpu);
+	rc = print_extlog_rcd(NULL, (struct acpi_generic_status *)elog_buf, cpu);
 
-	return rc;
+	return NOTIFY_DONE;
 }
 
 static int extlog_get_dsm(acpi_handle handle, int rev, int func, u64 *ret)
@@ -213,6 +217,9 @@ static bool extlog_get_l1addr(void)
 
 	return true;
 }
+static struct notifier_block extlog_mce_dec = {
+	.notifier_call	= extlog_print,
+};
 
 static int __init extlog_init(void)
 {
@@ -279,7 +286,7 @@ static int __init extlog_init(void)
 	if (elog_buf == NULL)
 		goto err_release_elog;
 
-	register_elog_handler(extlog_print);
+	mce_register_decode_chain(&extlog_mce_dec);
 	/* enable OS to be involved to take over management from BIOS */
 	((struct extlog_l1_head *)extlog_l1_addr)->flags |= FLAG_OS_OPTIN;
 
@@ -300,7 +307,7 @@ err:
 
 static void __exit extlog_exit(void)
 {
-	unregister_elog_handler(extlog_print);
+	mce_unregister_decode_chain(&extlog_mce_dec);
 	((struct extlog_l1_head *)extlog_l1_addr)->flags &= ~FLAG_OS_OPTIN;
 	if (extlog_l1_addr)
 		acpi_os_unmap_memory(extlog_l1_addr, l1_size);

Re: [PATCH v3 4/9] ACPI, x86: Extended error log driver for x86 platform

[Tony Luck]

On Mon, Oct 21, 2013 at 12:03 PM, Luck, Tony <tony.luck@intel.com> wrote:
> So this is on top of the 9 patch series (using the V4 that Chen Gong
> posted for part 4/9 and V3 for all the others).  Obviously it should
> be folded back into the series if we go this way.
>
> It's a bit simplistic right now - the registered function just returns
> NOTIFY_DONE in all cases so it will not disturb processing by any other
> registered functions - we can make it smarter later.

I folded that back into the series. Also switched out the test on whether to
print the "No further action is required" message to only do so for corrected
errors.  Cleaned up some of the commit messages,

The result is sitting at:
git://git.kernel.org/pub/scm/linux/kernel/git/ras/ras.git eMCA

Anything we missed?

-Tony

Re: [PATCH v3 4/9] ACPI, x86: Extended error log driver for x86 platform

[Borislav Petkov]

On Mon, Oct 21, 2013 at 03:39:20PM -0700, Tony Luck wrote:
> I folded that back into the series. Also switched out the test on
> whether to print the "No further action is required" message to only
> do so for corrected errors. Cleaned up some of the commit messages,
>
> The result is sitting at:
> git://git.kernel.org/pub/scm/linux/kernel/git/ras/ras.git eMCA
>
> Anything we missed?

Doesn't look so, at a first glance. But I agree with you - this stuff
will be subject to change as we go along and we make up our mind about
what exactly is sufficient and necessary to do proper decoding.

I like the idea of keeping an open mind about it. :-)

Thanks.

Re: [PATCH v3 8/9] ACPI, APEI, CPER: Cleanup CPER memory error output format

[Borislav Petkov]

On Mon, Oct 21, 2013 at 05:14:05PM +0000, Luck, Tony wrote:
> Even if we recovered from a UC error (which is by no means a sure
> thing) ... I don't think the "requires no further action" message
> applies.
>
> Soft single bit errors are common (well, common-ish ... they should
> still be somewhat rare by most objective standard). Double bit errors
> are much rarer ... and are very unlikely to be the result of two
> single bit errors happening to be inside the same cache line. I'd
> recommend further investigation of the source of a UC error (even one
> that is "recovered" in software).

Btw, do we even need to make this distinction? I mean, do we even reach
this path on an error where we need to raise a #MC exception? In the
initial design we were called from machine_check_poll which is not the
exception path and now we're on the decode_chain which gets all errors.

Are we ready to handle all? And also, why do we even need to
differentiate the error types on reporting? I mean, if it is, say, a
contained UC error and we can start a recovery action from userspace
like killing the process, we probably want to have that same detailed
report too?

 [ This is purely hypothetical, of course, as we do the poisoning game
 and killing of processes from kernel space now but still... ]

Thanks.

Re: [PATCH v3 4/9] ACPI, x86: Extended error log driver for x86 platform

[Naveen N. Rao]

On 10/22/2013 12:33 AM, Luck, Tony wrote:
>> But yes, this is possible and it would make it all even cleaner
>> and simpler by simply not needing the reg/dereg interfaces for
>> mce_ext_err_print but adding it to the chain.
>
> So this is on top of the 9 patch series (using the V4 that Chen Gong
> posted for part 4/9 and V3 for all the others).  Obviously it should
> be folded back into the series if we go this way.
>
> It's a bit simplistic right now - the registered function just returns
> NOTIFY_DONE in all cases so it will not disturb processing by any other
> registered functions - we can make it smarter later.

Looks good. We obviously need to ensure this gets called before EDAC, if 
at all. The other question is w.r.t conflicts with EDAC, which we can 
re-visit as part of the discussions around a new trace event.

Thanks,
Naveen

Re: [PATCH v3 4/9] ACPI, x86: Extended error log driver for x86 platform

[Xie XiuQi]

On 2013/10/18 20:37, Naveen N. Rao wrote:
> On 10/18/2013 01:53 PM, Chen, Gong wrote:
>> This H/W error log driver (a.k.a eMCA driver) is implemented based on
>> http://www.intel.com/content/www/us/en/architecture-and-technology/enhanced-mca-logging-xeon-paper.html
>>
>> After errors are captured, more valuable information can be
>> got via this new enhanced H/W error log driver.
>>
>> v3 -> v2: fix a MACRO definition error and some cleanup
>> v2 -> v1: eliminate spin_lock & minor fixes suggested by Boris
>>
>> Signed-off-by: Chen, Gong <gong.chen@linux.intel.com>
>> ---
>>   arch/x86/include/asm/mce.h       |   5 +
>>   arch/x86/kernel/cpu/mcheck/mce.c |  20 +++
>>   drivers/acpi/Kconfig             |  20 +++
>>   drivers/acpi/Makefile            |   2 +

[...]

>> +}
>> +EXPORT_SYMBOL_GPL(unregister_elog_handler);
>> +
>>   /*
>>    * Poll for corrected events or events that happened before reset.
>>    * Those are just logged through /dev/mcelog.
>> @@ -624,6 +641,9 @@ void machine_check_poll(enum mcp_flags flags, mce_banks_t *b)
>>               (m.status & (mca_cfg.ser ? MCI_STATUS_S : MCI_STATUS_UC)))
>>               continue;
>>
>> +        if (mce_ext_err_print)
>> +            mce_ext_err_print(NULL, m.extcpu, i);
>> +
> 
> Can we use the notifier chain we already have: mce_register_decode_chain()? EDAC uses this and I'm wondering if it is a good fit here. As an added bonus, it seems to honor dont_log_ce option as well.

Hi everyone,

I have a question here, is it safe when we use printk in MCE context?

The call graph is like this,
do_machine_check
 -> mce_log
  -> atomic_notifier_call_chain(&x86_mce_decoder_chain ...)
   -> ...
    -> extlog_print
     -> print_extlog_rcd
      -> __print_extlog_rcd
       -> printk

There's a logbuf_lock in printk. If logbuf_lock is held by other cpu,
it'll lead to an infinity spin here. Isn't it?

--
Thanks,
	XiuQi

> 
>>           mce_read_aux(&m, i);
>>
>>           if (!(flags & MCP_TIMESTAMP))
>> diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
>> index 22327e6..c67ec61 100644
>> --- a/drivers/acpi/Kconfig
>> +++ b/drivers/acpi/Kconfig
>> @@ -372,4 +372,24 @@ config ACPI_BGRT
>>
>>   source "drivers/acpi/apei/Kconfig"
>>
>> +config ACPI_EXTLOG
>> +    tristate "Extended Error Log support"
>> +    depends on X86_MCE
...

Re: [PATCH v3 4/9] ACPI, x86: Extended error log driver for x86 platform

[Borislav Petkov]

On Fri, Jun 27, 2014 at 01:34:45PM +0800, Xie XiuQi wrote:
> The call graph is like this,
> do_machine_check
>  -> mce_log
>   -> atomic_notifier_call_chain(&x86_mce_decoder_chain ...)
>    -> ...
>     -> extlog_print
>      -> print_extlog_rcd
>       -> __print_extlog_rcd
>        -> printk
> 
> There's a logbuf_lock in printk. If logbuf_lock is held by other cpu,
> it'll lead to an infinity spin here. Isn't it?

Yes, but we want to take the risk and print something out before the
machine dies instead of waiting to get into printk-safe context first
and maybe corrupt state.

Besides, there's work currently going on to make printk safe in atomic
context so...

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
--

RE: [PATCH v3 4/9] ACPI, x86: Extended error log driver for x86 platform

[Luck, Tony]

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>> There's a logbuf_lock in printk. If logbuf_lock is held by other cpu,
>> it'll lead to an infinity spin here. Isn't it?
>
> Yes, but we want to take the risk and print something out before the
> machine dies instead of waiting to get into printk-safe context first
> and maybe corrupt state.

Not all machine checks are fatal - it would be bad for us to go into an
infinite spin instead of executing the recovery code.

> Besides, there's work currently going on to make printk safe in atomic
> context so...

Good - we need this.

-Tony
ÿôèº{.nÇ+‰·Ÿ®‰­†+%ŠËÿ±éݶ\x17¥Šwÿº{.nÇ+‰·¥Š{±þG«éÿŠ{ayº\x1dʇڙë,j\a­¢f£¢·hšïêÿ‘êçz_è®\x03(­éšŽŠÝ¢j"ú\x1a¶^[m§ÿÿ¾\a«þG«éÿ¢¸?™¨è­Ú&£ø§~á¶iO•æ¬z·švØ^\x14\x04\x1a¶^[m§ÿÿÃ\fÿ¶ìÿ¢¸?–I¥

Re: [PATCH v3 4/9] ACPI, x86: Extended error log driver for x86 platform

[Borislav Petkov]

On Fri, Jun 27, 2014 at 08:43:14PM +0000, Luck, Tony wrote:
> Not all machine checks are fatal - it would be bad for us to go into
> an infinite spin instead of executing the recovery code.

Then for the time being extlog shouldn't hook into the decoder chain
but into mce_process_work, i.e. the last should call it. Or maybe add
another notifier which is not atomic...

RE: [PATCH v3 4/9] ACPI, x86: Extended error log driver for x86 platform

[Luck, Tony]

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain; charset="utf-8", Size: 902 bytes --]

>> Not all machine checks are fatal - it would be bad for us to go into
>> an infinite spin instead of executing the recovery code.
>
> Then for the time being extlog shouldn't hook into the decoder chain
> but into mce_process_work, i.e. the last should call it. Or maybe add
> another notifier which is not atomic...

I spoke too quickly.  The only MCE for which we have recovery code are
those that hit in application code.  So the processor that is trying to do
the printk() can't possibly be holding the locks.  Other processors might
have held the lock at the time of the MCE - but they have all returned 
from the handler at the time we try the printk - so they will make progess
and release the lock so that we can acquire it.

-Tony
ÿôèº{.nÇ+‰·Ÿ®‰­†+%ŠËÿ±éݶ\x17¥Šwÿº{.nÇ+‰·¥Š{±þG«éÿŠ{ayº\x1dʇڙë,j\a­¢f£¢·hšïêÿ‘êçz_è®\x03(­éšŽŠÝ¢j"ú\x1a¶^[m§ÿÿ¾\a«þG«éÿ¢¸?™¨è­Ú&£ø§~á¶iO•æ¬z·švØ^\x14\x04\x1a¶^[m§ÿÿÃ\fÿ¶ìÿ¢¸?–I¥

Re: [PATCH v3 4/9] ACPI, x86: Extended error log driver for x86 platform

[Borislav Petkov]

On Fri, Jun 27, 2014 at 10:10:48PM +0000, Luck, Tony wrote:
> I spoke too quickly. The only MCE for which we have recovery code are
> those that hit in application code. So the processor that is trying to
> do the printk() can't possibly be holding the locks. Other processors
> might have held the lock at the time of the MCE - but they have all
> returned from the handler at the time we try the printk - so they will
> make progess and release the lock so that we can acquire it.

That could explain why we're not seeing hangs left and right. :-)

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
--

Re: [PATCH v3 4/9] ACPI, x86: Extended error log driver for x86 platform

[Xie XiuQi]

On 2014/6/28 6:10, Luck, Tony wrote:
>>> Not all machine checks are fatal - it would be bad for us to go into
>>> an infinite spin instead of executing the recovery code.
>>
>> Then for the time being extlog shouldn't hook into the decoder chain
>> but into mce_process_work, i.e. the last should call it. Or maybe add
>> another notifier which is not atomic...
> 
> I spoke too quickly.  The only MCE for which we have recovery code are
> those that hit in application code.  So the processor that is trying to do
> the printk() can't possibly be holding the locks.  Other processors might
> have held the lock at the time of the MCE - but they have all returned 
> from the handler at the time we try the printk - so they will make progess
> and release the lock so that we can acquire it.

Thank you for your reply.

When we got a MCE which hit in application code, it will be broadcast to
other processors immediately. Other processors who might have held the lock
at the time of MCE, have no chance to release the lock and return from the
printk. Isn't it?

I know this rarely happens in production environments, but I think it's still
a risk here. So it's very good if we have a printk safe in atomic context in
the future.

--
Thanks,
	XiuQi

> 
> -Tony
>