diff options
| author | Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> | 2025-01-14 19:08:39 +0200 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2025-01-16 12:04:38 -0600 |
| commit | ad41ddeeac216417a52fbc1060577f3098f4e90e (patch) | |
| tree | 61e1709b2aa1d87edcf6b3802db6248ff89357c2 /drivers/pci/pci.h | |
| parent | e5321ae10e1323359a5067a26dfe98b5f44cc5e6 (diff) | |
PCI: Add TLP Prefix reading to pcie_read_tlp_log()
pcie_read_tlp_log() handles only 4 Header Log DWORDs but TLP Prefix Log
(PCIe r6.1 secs 7.8.4.12 & 7.9.14.13) may also be present.
Generalize pcie_read_tlp_log() and struct pcie_tlp_log to also handle TLP
Prefix Log. The relevant registers are formatted identically in AER and DPC
Capability, but has these variations:
a) The offsets of TLP Prefix Log registers vary.
b) DPC RP PIO TLP Prefix Log register can be < 4 DWORDs.
c) AER TLP Prefix Log Present (PCIe r6.1 sec 7.8.4.7) can indicate Prefix
Log is not present.
Therefore callers must pass the offset of the TLP Prefix Log register and
the entire length to pcie_read_tlp_log() to be able to read the correct
number of TLP Prefix DWORDs from the correct offset.
Link: https://lore.kernel.org/r/20250114170840.1633-8-ilpo.jarvinen@linux.intel.com
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
[bhelgaas: squash ternary fix from
https://lore.kernel.org/r/20250116172019.88116-1-colin.i.king@gmail.com]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/pci/pci.h')
| -rw-r--r-- | drivers/pci/pci.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index 55fcf3bac4f7..7797b2544d00 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -550,7 +550,9 @@ struct aer_err_info { int aer_get_device_error_info(struct pci_dev *dev, struct aer_err_info *info); void aer_print_error(struct pci_dev *dev, struct aer_err_info *info); -int pcie_read_tlp_log(struct pci_dev *dev, int where, struct pcie_tlp_log *log); +int pcie_read_tlp_log(struct pci_dev *dev, int where, int where2, + unsigned int tlp_len, struct pcie_tlp_log *log); +unsigned int aer_tlp_log_len(struct pci_dev *dev, u32 aercc); #endif /* CONFIG_PCIEAER */ #ifdef CONFIG_PCIEPORTBUS @@ -569,6 +571,7 @@ void pci_dpc_init(struct pci_dev *pdev); void dpc_process_error(struct pci_dev *pdev); pci_ers_result_t dpc_reset_link(struct pci_dev *pdev); bool pci_dpc_recovered(struct pci_dev *pdev); +unsigned int dpc_tlp_log_len(struct pci_dev *dev); #else static inline void pci_save_dpc_state(struct pci_dev *dev) { } static inline void pci_restore_dpc_state(struct pci_dev *dev) { } |