linux-kernel - [PATCH v13 1/3] PCI: make pci_dev_is_disconnected() helper public for other drivers

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Message-Id: <20240222090251.2849702-2-haifeng.zhao@linux.intel.com>
Date: Thu, 22 Feb 2024 04:02:49 -0500
From: Ethan Zhao <haifeng.zhao@...ux.intel.com>
To: baolu.lu@...ux.intel.com,
	bhelgaas@...gle.com,
	robin.murphy@....com,
	jgg@...pe.ca
Cc: kevin.tian@...el.com,
	dwmw2@...radead.org,
	will@...nel.org,
	lukas@...ner.de,
	yi.l.liu@...el.com,
	dan.carpenter@...aro.org,
	iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org,
	Ethan Zhao <haifeng.zhao@...ux.intel.com>,
	Haorong Ye <yehaorong@...edance.com>
Subject: [PATCH v13 1/3] PCI: make pci_dev_is_disconnected() helper public for other drivers

Make pci_dev_is_disconnected() public so that it can be called from
Intel VT-d driver to quickly fix/workaround the surprise removal
unplug hang issue for those ATS capable devices on PCIe switch downstream
hotplug capable ports.

Beside pci_device_is_present() function, this one has no config space
space access, so is light enough to optimize the normal pure surprise
removal and safe removal flow.

Tested-by: Haorong Ye <yehaorong@...edance.com>
Signed-off-by: Ethan Zhao <haifeng.zhao@...ux.intel.com>
---
 drivers/pci/pci.h   | 5 -----
 include/linux/pci.h | 5 +++++
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index e9750b1b19ba..bfc56f7bee1c 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -368,11 +368,6 @@ static inline int pci_dev_set_disconnected(struct pci_dev *dev, void *unused)
 	return 0;
 }
 
-static inline bool pci_dev_is_disconnected(const struct pci_dev *dev)
-{
-	return dev->error_state == pci_channel_io_perm_failure;
-}
-
 /* pci_dev priv_flags */
 #define PCI_DEV_ADDED 0
 #define PCI_DPC_RECOVERED 1
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 7ab0d13672da..213109d3c601 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -2517,6 +2517,11 @@ static inline struct pci_dev *pcie_find_root_port(struct pci_dev *dev)
 	return NULL;
 }
 
+static inline bool pci_dev_is_disconnected(const struct pci_dev *dev)
+{
+	return dev->error_state == pci_channel_io_perm_failure;
+}
+
 void pci_request_acs(void);
 bool pci_acs_enabled(struct pci_dev *pdev, u16 acs_flags);
 bool pci_acs_path_enabled(struct pci_dev *start,
-- 
2.31.1