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| author |   Jacob Keller <jacob.e.keller@intel.com> | 2020-03-02 18:25:00 -0800 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2020-03-05 17:36:24 -0800 |
| commit | 70c0923b0ef10b1c8d8f78fb50fcaef8eaae619d (patch) | |
| tree | 13fa85fb4022d726761d0e49f3c01ffc014d8d03 /include/linux/pci.h | |
| parent | ibmveth: Remove unused page_offset macro (diff) | |
| download | linux-dev-70c0923b0ef10b1c8d8f78fb50fcaef8eaae619d.tar.xz linux-dev-70c0923b0ef10b1c8d8f78fb50fcaef8eaae619d.zip | |
PCI: Introduce pci_get_dsn
Several device drivers read their Device Serial Number from the PCIe
extended config space.
Introduce a new helper function, pci_get_dsn(). This function reads the
eight bytes of the DSN and returns them as a u64. If the capability does not
exist for the device, the function returns 0.
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Cc: Michael Chan <michael.chan@broadcom.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/pci.h')
| -rw-r--r-- | include/linux/pci.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/pci.h b/include/linux/pci.h index 7beaf51e98ec..fc54b8922e66 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -1052,6 +1052,8 @@ int pci_find_ht_capability(struct pci_dev *dev, int ht_cap); int pci_find_next_ht_capability(struct pci_dev *dev, int pos, int ht_cap); struct pci_bus *pci_find_next_bus(const struct pci_bus *from); +u64 pci_get_dsn(struct pci_dev *dev); + struct pci_dev *pci_get_device(unsigned int vendor, unsigned int device, struct pci_dev *from); struct pci_dev *pci_get_subsys(unsigned int vendor, unsigned int device, @@ -1707,6 +1709,9 @@ static inline int pci_find_next_capability(struct pci_dev *dev, u8 post, static inline int pci_find_ext_capability(struct pci_dev *dev, int cap) { return 0; } +static inline u64 pci_get_dsn(struct pci_dev *dev) +{ return 0; } + /* Power management related routines */ static inline int pci_save_state(struct pci_dev *dev) { return 0; } static inline void pci_restore_state(struct pci_dev *dev) { } |