From: Ethan Zhao haifeng.zhao@linux.intel.com
[ Upstream commit 39714fd73c6b60a8d27bcc5b431afb0828bf4434 ]
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.
Acked-by: Bjorn Helgaas bhelgaas@google.com Reviewed-by: Dan Carpenter dan.carpenter@linaro.org Tested-by: Haorong Ye yehaorong@bytedance.com Signed-off-by: Ethan Zhao haifeng.zhao@linux.intel.com Link: https://lore.kernel.org/r/20240301080727.3529832-2-haifeng.zhao@linux.intel.... Signed-off-by: Lu Baolu baolu.lu@linux.intel.com Signed-off-by: Joerg Roedel jroedel@suse.de Stable-dep-of: 4fc82cd907ac ("iommu/vt-d: Don't issue ATS Invalidation request when device is disconnected") Signed-off-by: Sasha Levin sashal@kernel.org --- 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 99abc4cec0df1..1b4f941829724 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -363,11 +363,6 @@ 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 3af5f29985511..b548d5646a86d 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -2477,6 +2477,11 @@ 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,