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From:   Vidya Sagar <vidyas@nvidia.com>
To:     <jingoohan1@gmail.com>, <gustavo.pimentel@synopsys.com>,
        <lorenzo.pieralisi@arm.com>, <bhelgaas@google.com>,
        <amurray@thegoodpenguin.co.uk>, <robh@kernel.org>,
        <treding@nvidia.com>, <jonathanh@nvidia.com>
CC:     <linux-pci@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <kthota@nvidia.com>, <mmaddireddy@nvidia.com>, <vidyas@nvidia.com>,
        <sagar.tv@gmail.com>
Subject: [PATCH V3 1/2] PCI/AER: Add pcie_is_ecrc_enabled() API
Date:   Thu, 29 Oct 2020 11:09:58 +0530
Message-ID: <20201029053959.31361-2-vidyas@nvidia.com>
In-Reply-To: <20201029053959.31361-1-vidyas@nvidia.com>
References: <20201029053959.31361-1-vidyas@nvidia.com>
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Adds pcie_is_ecrc_enabled() API to let other sub-systems (like DesignWare)
to query if ECRC policy is enabled and perform any configuration
required in those respective sub-systems.

Signed-off-by: Vidya Sagar <vidyas@nvidia.com>
Reviewed-by: Jingoo Han <jingoohan1@gmail.com>
---
V3:
* Address Ethan Zhao's comments
* Added 'Reviewed-by: Jingoo Han <jingoohan1@gmail.com>'

V2:
* None from V1

 drivers/pci/pci.h      |  2 ++
 drivers/pci/pcie/aer.c | 11 +++++++++++
 2 files changed, 13 insertions(+)

diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index fa12f7cbc1a0..325fdbf91dde 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -575,9 +575,11 @@ static inline void pcie_aspm_powersave_config_link(struct pci_dev *pdev) { }
 #ifdef CONFIG_PCIE_ECRC
 void pcie_set_ecrc_checking(struct pci_dev *dev);
 void pcie_ecrc_get_policy(char *str);
+bool pcie_is_ecrc_enabled(void);
 #else
 static inline void pcie_set_ecrc_checking(struct pci_dev *dev) { }
 static inline void pcie_ecrc_get_policy(char *str) { }
+static inline bool pcie_is_ecrc_enabled(void) { return false; }
 #endif
 
 #ifdef CONFIG_PCIE_PTM
diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index 65dff5f3457a..d0f5a7043aff 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -207,6 +207,17 @@ void pcie_ecrc_get_policy(char *str)
 
 	ecrc_policy = i;
 }
+
+/**
+ * pcie_is_ecrc_enabled - returns if ECRC is enabled in the system or not
+ *
+ * Returns true if ECRC policy is enabled and false otherwise
+ */
+bool pcie_is_ecrc_enabled(void)
+{
+	return ecrc_policy == ECRC_POLICY_ON;
+}
+EXPORT_SYMBOL(pcie_is_ecrc_enabled);
 #endif	/* CONFIG_PCIE_ECRC */
 
 #define	PCI_EXP_AER_FLAGS	(PCI_EXP_DEVCTL_CERE | PCI_EXP_DEVCTL_NFERE | \
-- 
2.17.1