ACPI, APEI, Add PCIe AER error information printing support

The AER error information printing support is implemented in
drivers/pci/pcie/aer/aer_print.c.  So some string constants, functions
and macros definitions can be re-used without being exported.

The original PCIe AER error information printing function is not
re-used directly because the overall format is quite different.  And
changing the original printing format may make some original users'
scripts broken.

Signed-off-by: Huang Ying <ying.huang@intel.com>
CC: Jesse Barnes <jbarnes@virtuousgeek.org>
CC: Zhang Yanmin <yanmin.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

2 files changed, 21 insertions, 4 deletions

diff --git a/drivers/acpi/apei/Kconfig b/drivers/acpi/apei/Kconfig
index fca34cc..9ecf6fe 100644
--- a/drivers/acpi/apei/Kconfig
+++ b/drivers/acpi/apei/Kconfig
@@ -21,6 +21,13 @@ config ACPI_APEI_GHES
 	  by firmware to produce more valuable hardware error
 	  information for Linux.
 
+config ACPI_APEI_PCIEAER
+	bool "APEI PCIe AER logging/recovering support"
+	depends on ACPI_APEI && PCIEAER
+	help
+	  PCIe AER errors may be reported via APEI firmware first mode.
+	  Turn on this option to enable the corresponding support.
+
 config ACPI_APEI_EINJ
 	tristate "APEI Error INJection (EINJ)"
 	depends on ACPI_APEI && DEBUG_FS
diff --git a/drivers/acpi/apei/cper.c b/drivers/acpi/apei/cper.c
index 31464a0..5d41894 100644
--- a/drivers/acpi/apei/cper.c
+++ b/drivers/acpi/apei/cper.c
@@ -29,6 +29,7 @@
 #include <linux/time.h>
 #include <linux/cper.h>
 #include <linux/acpi.h>
+#include <linux/aer.h>
 
 /*
  * CPER record ID need to be unique even after reboot, because record
@@ -70,8 +71,8 @@ static const char *cper_severity_str(unsigned int severity)
  * If the output length is longer than 80, multiple line will be
  * printed, with @pfx is printed at the beginning of each line.
  */
-static void cper_print_bits(const char *pfx, unsigned int bits,
-			    const char *strs[], unsigned int strs_size)
+void cper_print_bits(const char *pfx, unsigned int bits,
+		     const char *strs[], unsigned int strs_size)
 {
 	int i, len = 0;
 	const char *str;
@@ -81,6 +82,8 @@ static void cper_print_bits(const char *pfx, unsigned int bits,
 		if (!(bits & (1U << i)))
 			continue;
 		str = strs[i];
+		if (!str)
+			continue;
 		if (len && len + strlen(str) + 2 > 80) {
 			printk("%s\n", buf);
 			len = 0;
@@ -243,7 +246,8 @@ static const char *cper_pcie_port_type_strs[] = {
 	"root complex event collector",
 };
 
-static void cper_print_pcie(const char *pfx, const struct cper_sec_pcie *pcie)
+static void cper_print_pcie(const char *pfx, const struct cper_sec_pcie *pcie,
+			    const struct acpi_hest_generic_data *gdata)
 {
 	if (pcie->validation_bits & CPER_PCIE_VALID_PORT_TYPE)
 		printk("%s""port_type: %d, %s\n", pfx, pcie->port_type,
@@ -276,6 +280,12 @@ static void cper_print_pcie(const char *pfx, const struct cper_sec_pcie *pcie)
 		printk(
 	"%s""bridge: secondary_status: 0x%04x, control: 0x%04x\n",
 	pfx, pcie->bridge.secondary_status, pcie->bridge.control);
+#ifdef CONFIG_ACPI_APEI_PCIEAER
+	if (pcie->validation_bits & CPER_PCIE_VALID_AER_INFO) {
+		struct aer_capability_regs *aer_regs = (void *)pcie->aer_info;
+		cper_print_aer(pfx, gdata->error_severity, aer_regs);
+	}
+#endif
 }
 
 static const char *apei_estatus_section_flag_strs[] = {
@@ -322,7 +332,7 @@ static void apei_estatus_print_section(
 		struct cper_sec_pcie *pcie = (void *)(gdata + 1);
 		printk("%s""section_type: PCIe error\n", pfx);
 		if (gdata->error_data_length >= sizeof(*pcie))
-			cper_print_pcie(pfx, pcie);
+			cper_print_pcie(pfx, pcie, gdata);
 		else
 			goto err_section_too_small;
 	} else