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PCI: Make pci_dev_is_disconnected() helper public for other drivers 

[ Upstream commit 39714fd73c ]

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.com
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Stable-dep-of: 4fc82cd907 ("iommu/vt-d: Don't issue ATS Invalidation request when device is disconnected")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Ethan Zhao 2024-03-05 20:21:14 +08:00 committed by Sasha Levin
parent eeaa98f34d
commit 48fba9d7f5
2 changed files with 5 additions and 5 deletions
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5
drivers/pci/pci.h
View File

@ -357,11 +357,6 @@ 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

5
include/linux/pci.h
View File

@ -2355,6 +2355,11 @@ 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,