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From: Kai-Heng Feng <kai.heng.feng@canonical.com>
To: hkallweit1@gmail.com, nic_swsd@realtek.com, bhelgaas@google.com
Cc: davem@davemloft.net, kuba@kernel.org, anthony.wong@canonical.com,
	netdev@vger.kernel.org, linux-pci@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	"Kai-Heng Feng" <kai.heng.feng@canonical.com>,
	"Saheed O. Bolarinwa" <refactormyself@gmail.com>,
	"Vidya Sagar" <vidyas@nvidia.com>,
	"Krzysztof Wilczyński" <kw@linux.com>
Subject: [RFC] [PATCH net-next v5 1/3] PCI/ASPM: Introduce a new helper to report ASPM capability
Date: Thu, 16 Sep 2021 23:44:15 +0800	[thread overview]
Message-ID: <20210916154417.664323-2-kai.heng.feng@canonical.com> (raw)
In-Reply-To: <20210916154417.664323-1-kai.heng.feng@canonical.com>

Introduce a new helper, pcie_aspm_capable(), to report ASPM capability.

The user will be introduced by next patch.

Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
---
v5:
 - No change.

v4:
 - Report aspm_capable instead.

v3:
 - This is a new patch

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

diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
index 013a47f587cea..788e7496f33b1 100644
--- a/drivers/pci/pcie/aspm.c
+++ b/drivers/pci/pcie/aspm.c
@@ -1201,6 +1201,17 @@ bool pcie_aspm_enabled(struct pci_dev *pdev)
 }
 EXPORT_SYMBOL_GPL(pcie_aspm_enabled);
 
+bool pcie_aspm_capable(struct pci_dev *pdev)
+{
+	struct pcie_link_state *link = pcie_aspm_get_link(pdev);
+
+	if (!link)
+		return false;
+
+	return link->aspm_capable;
+}
+EXPORT_SYMBOL_GPL(pcie_aspm_capable);
+
 static ssize_t aspm_attr_show_common(struct device *dev,
 				     struct device_attribute *attr,
 				     char *buf, u8 state)
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 34d7d94ddf6dc..d77919d125af1 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1631,6 +1631,7 @@ int pci_disable_link_state_locked(struct pci_dev *pdev, int state);
 void pcie_no_aspm(void);
 bool pcie_aspm_support_enabled(void);
 bool pcie_aspm_enabled(struct pci_dev *pdev);
+bool pcie_aspm_capable(struct pci_dev *pdev);
 #else
 static inline int pci_disable_link_state(struct pci_dev *pdev, int state)
 { return 0; }
@@ -1639,6 +1640,7 @@ static inline int pci_disable_link_state_locked(struct pci_dev *pdev, int state)
 static inline void pcie_no_aspm(void) { }
 static inline bool pcie_aspm_support_enabled(void) { return false; }
 static inline bool pcie_aspm_enabled(struct pci_dev *pdev) { return false; }
+static inline bool pcie_aspm_capable(struct pci_dev *pdev) { return false; }
 #endif
 
 #ifdef CONFIG_PCIEAER
-- 
2.32.0


  reply	other threads:[~2021-09-16 15:44 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-16 15:44 [RFC] [PATCH net-next v5 0/3] r8169: Implement dynamic ASPM mechanism for recent 1.0/2.5Gbps Realtek NICs Kai-Heng Feng
2021-09-16 15:44 ` Kai-Heng Feng [this message]
2021-09-16 15:44 ` [RFC] [PATCH net-next v5 2/3] r8169: Use PCIe ASPM status for NIC ASPM enablement Kai-Heng Feng
2021-09-16 17:07   ` Bjorn Helgaas
2021-09-17  4:09     ` Kai-Heng Feng
2021-09-17 15:26       ` Bjorn Helgaas
2021-10-01  4:32         ` Kai-Heng Feng
2021-09-16 15:44 ` [RFC] [PATCH net-next v5 3/3] r8169: Implement dynamic ASPM mechanism Kai-Heng Feng
2021-09-16 17:12   ` Bjorn Helgaas
2021-09-17  4:19     ` Kai-Heng Feng
2021-09-17 22:09 ` [RFC] [PATCH net-next v5 0/3] r8169: Implement dynamic ASPM mechanism for recent 1.0/2.5Gbps Realtek NICs Bjorn Helgaas
2021-10-01  4:17   ` Kai-Heng Feng
2021-10-07 19:10     ` Bjorn Helgaas
2021-10-08 13:56     ` Bjorn Helgaas
2021-10-07 16:15 [RFC] [PATCH net-next v6 " Kai-Heng Feng
2021-10-07 16:15 ` [RFC] [PATCH net-next v5 1/3] PCI/ASPM: Introduce a new helper to report ASPM capability Kai-Heng Feng
2021-10-08 22:18   ` Bjorn Helgaas

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