linux-kernel - [PATCH v6 7/9] PCI/AER: Allow clearing Error Status Register in FF mode

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Message-Id: <717b6e3ec41eefff16d4c7b24f46f140eb4fbf02.1564177080.git.sathyanarayanan.kuppuswamy@linux.intel.com>
Date:   Fri, 26 Jul 2019 14:43:17 -0700
From:   sathyanarayanan.kuppuswamy@...ux.intel.com
To:     bhelgaas@...gle.com
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        ashok.raj@...el.com, keith.busch@...el.com,
        sathyanarayanan.kuppuswamy@...ux.intel.com
Subject: [PATCH v6 7/9] PCI/AER: Allow clearing Error Status Register in FF mode

From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>

As per PCI firmware specification r3.2 Downstream Port Containment
Related Enhancements ECN, sec 4.5.1, table 4-6, Error Disconnect
Recover (EDR) support allows OS to handle error recovery and
clearing Error Registers even in FF mode. So remove FF mode checks in
pci_cleanup_aer_uncorrect_error_status(), pci_aer_clear_fatal_status()
and pci_cleanup_aer_error_status_regs() functions.

Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
---
 drivers/pci/pcie/aer.c | 12 ++----------
 1 file changed, 2 insertions(+), 10 deletions(-)

diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index b45bc47d04fe..e1509bb900c5 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -383,9 +383,6 @@ int pci_cleanup_aer_uncorrect_error_status(struct pci_dev *dev)
 	if (!pos)
 		return -EIO;
 
-	if (pcie_aer_get_firmware_first(dev))
-		return -EIO;
-
 	/* Clear status bits for ERR_NONFATAL errors only */
 	pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status);
 	pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, &sev);
@@ -406,9 +403,6 @@ void pci_aer_clear_fatal_status(struct pci_dev *dev)
 	if (!pos)
 		return;
 
-	if (pcie_aer_get_firmware_first(dev))
-		return;
-
 	/* Clear status bits for ERR_FATAL errors only */
 	pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, &status);
 	pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_SEVER, &sev);
@@ -430,9 +424,6 @@ int pci_cleanup_aer_error_status_regs(struct pci_dev *dev)
 	if (!pos)
 		return -EIO;
 
-	if (pcie_aer_get_firmware_first(dev))
-		return -EIO;
-
 	port_type = pci_pcie_type(dev);
 	if (port_type == PCI_EXP_TYPE_ROOT_PORT) {
 		pci_read_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, &status);
@@ -455,7 +446,8 @@ void pci_aer_init(struct pci_dev *dev)
 	if (dev->aer_cap)
 		dev->aer_stats = kzalloc(sizeof(struct aer_stats), GFP_KERNEL);
 
-	pci_cleanup_aer_error_status_regs(dev);
+	if (!pcie_aer_get_firmware_first(dev))
+		pci_cleanup_aer_error_status_regs(dev);
 }
 
 void pci_aer_exit(struct pci_dev *dev)
-- 
2.21.0