PCI: pcie, aer: refer mask state in mask register properly

ERR_{,UN}CORRECTABLE_ERROR_MASK are set of error bits which linux know,
set of PCI_ERR_COR_* and PCI_ERR_UNC_* defined in linux/pci_regs.h.
This masks make aerdrv not to report errors of unknown bit, while aerdrv
have ability to report such undefined errors as "Unknown Error Bit %2d".

OTOH aerdrv_errprint does not have any check of setting in mask register.
So it could report masked wrong error by finding bit in status without
knowing that the bit is masked in the mask register.

This patch changes aerdrv to use mask state in mask register propely
instead of defined/hardcoded ERR_{,UN}CORRECTABLE_ERROR_MASK.
This change prevents aerdrv from reporting masked error, and also enable
reporting unknown errors.
Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Reviewed-by: Andrew Patterson <andrew.patterson@hp.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

drivers/pci/pcie/aer/aerdrv.h

@@ -47,9 +47,6 @@
 #define AER_TLP_HEADER_VALID_FLAG	0x00000001
 #define AER_MULTI_ERROR_VALID_FLAG	0x00000002
 
-#define ERR_CORRECTABLE_ERROR_MASK	0x000031c1
-#define ERR_UNCORRECTABLE_ERROR_MASK	0x001ff010
-
 struct header_log_regs {
 	unsigned int dw0;
 	unsigned int dw1;
@@ -65,6 +62,7 @@ struct aer_err_info {
 	int severity;			/* 0:NONFATAL | 1:FATAL | 2:COR */
 	int flags;
 	unsigned int status;		/* COR/UNCOR Error Status */
+	unsigned int mask;		/* COR/UNCOR Error Mask */
 	struct header_log_regs tlp;	/* TLP Header */
 };
 

drivers/pci/pcie/aer/aerdrv_core.c

@@ -236,24 +236,16 @@ static int find_device_iter(struct pci_dev *dev, void *data)
 	status = 0;
 	mask = 0;
 	if (e_info->severity == AER_CORRECTABLE) {
-		pci_read_config_dword(dev,
-				pos + PCI_ERR_COR_STATUS,
-				&status);
-		pci_read_config_dword(dev,
-				pos + PCI_ERR_COR_MASK,
-				&mask);
-		if (status & ERR_CORRECTABLE_ERROR_MASK & ~mask) {
+		pci_read_config_dword(dev, pos + PCI_ERR_COR_STATUS, &status);
+		pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK, &mask);
+		if (status & ~mask) {
 			add_error_device(e_info, dev);
 			goto added;
 		}
 	} else {
-		pci_read_config_dword(dev,
-				pos + PCI_ERR_UNCOR_STATUS,
-				&status);
-		pci_read_config_dword(dev,
-				pos + PCI_ERR_UNCOR_MASK,
-				&mask);
-		if (status & ERR_UNCORRECTABLE_ERROR_MASK & ~mask) {
+		pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status);
+		pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, &mask);
+		if (status & ~mask) {
 			add_error_device(e_info, dev);
 			goto added;
 		}
@@ -720,7 +712,9 @@ static int get_device_error_info(struct pci_dev *dev, struct aer_err_info *info)
 	if (info->severity == AER_CORRECTABLE) {
 		pci_read_config_dword(dev, pos + PCI_ERR_COR_STATUS,
 			&info->status);
-		if (!(info->status & ERR_CORRECTABLE_ERROR_MASK))
+		pci_read_config_dword(dev, pos + PCI_ERR_COR_MASK,
+			&info->mask);
+		if (!(info->status & ~info->mask))
 			return AER_UNSUCCESS;
 	} else if (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE ||
 		info->severity == AER_NONFATAL) {
@@ -728,7 +722,9 @@ static int get_device_error_info(struct pci_dev *dev, struct aer_err_info *info)
 		/* Link is still healthy for IO reads */
 		pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS,
 			&info->status);
-		if (!(info->status & ERR_UNCORRECTABLE_ERROR_MASK))
+		pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_MASK,
+			&info->mask);
+		if (!(info->status & ~info->mask))
 			return AER_UNSUCCESS;
 
 		if (info->status & AER_LOG_TLP_MASKS) {

drivers/pci/pcie/aer/aerdrv_errprint.c

@@ -154,11 +154,13 @@ static char *aer_agent_string[] = {
 
 static void aer_print_error_source(struct aer_err_info *info)
 {
-	int i;
+	int i, status;
 	char *errmsg = NULL;
 
+	status = (info->status & ~info->mask);
+
 	for (i = 0; i < 32; i++) {
-		if (!(info->status & (1 << i)))
+		if (!(status & (1 << i)))
 			continue;
 
 		if (info->severity == AER_CORRECTABLE)