PCI: dwc: Add debugfs property to provide LTSSM status of the PCIe link

Add the debugfs property to provide a view of the current link's LTSSM
status from the Root Port device.

Signed-off-by: Hans

PCI: dwc: Add debugfs property to provide LTSSM status of the PCIe link

Add the debugfs property to provide a view of the current link's LTSSM
status from the Root Port device.

Signed-off-by: Hans Zhang <[email protected]>
Reviewed-by: Manivannan Sadhasivam <[email protected]>
Tested-by: Niklas Cassel <[email protected]>
Tested-by: Hrishikesh Deleep <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[kwilczynski: commit log, refactor dw_ltssm_sts_string() to avoid
compilation errors on platforms that do not set CONFIG_PCIE_DW_HOST]
Signed-off-by: Krzysztof Wilczyński <[email protected]>

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PCI: dwc: Add debugfs based Statistical Counter support for DWC

Add support to provide Statistical Counter interface to userspace.

This set of debug registers are part of the RAS DES feature presen

PCI: dwc: Add debugfs based Statistical Counter support for DWC

Add support to provide Statistical Counter interface to userspace.

This set of debug registers are part of the RAS DES feature present in
DesignWare PCIe controllers.

Co-developed-by: Manivannan Sadhasivam <[email protected]>
Signed-off-by: Shradha Todi <[email protected]>
Reviewed-by: Manivannan Sadhasivam <[email protected]>
Tested-by: Hrishikesh Deleep <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[kwilczynski: commit log, tidy up code comments, update documentation,
squashed patch that checks if the event counter is supported from
https://lore.kernel.org/linux-pci/[email protected]]
Signed-off-by: Krzysztof Wilczyński <[email protected]>

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PCI: dwc: Add debugfs based Error Injection support for DWC

Add support to provide Error Injection interface to userspace.

This set of debug registers are part of the RAS DES feature present in
Des

PCI: dwc: Add debugfs based Error Injection support for DWC

Add support to provide Error Injection interface to userspace.

This set of debug registers are part of the RAS DES feature present in
DesignWare PCIe controllers.

Signed-off-by: Shradha Todi <[email protected]>
Reviewed-by: Manivannan Sadhasivam <[email protected]>
Reviewed-by: Fan Ni <[email protected]>
Tested-by: Hrishikesh Deleep <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[kwilczynski: commit log, tidy up code comments, update documentation,
change debugfs property name from "duplicate_dllp" to "duplicate_tlp"]
Signed-off-by: Krzysztof Wilczyński <[email protected]>

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PCI: dwc: Add debugfs based Silicon Debug support for DWC

Add support to provide Silicon Debug interface to userspace.

This set of debug registers are part of the RAS DES feature present in
DesignW

PCI: dwc: Add debugfs based Silicon Debug support for DWC

Add support to provide Silicon Debug interface to userspace.

This set of debug registers are part of the RAS DES feature present in
DesignWare PCIe controllers.

Co-developed-by: Manivannan Sadhasivam <[email protected]>
Signed-off-by: Shradha Todi <[email protected]>
Reviewed-by: Manivannan Sadhasivam <[email protected]>
Reviewed-by: Fan Ni <[email protected]>
Tested-by: Hrishikesh Deleep <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[kwilczynski: commit log, tidy up Kconfig and drop "default y", tidy up
code comments, squashed patch that fixes a NULL pointer dereference when
debugfs is already unavailable during clean-up from
https://lore.kernel.org/linux-pci/[email protected],
refactor dwc_pcie_debugfs_init() to not return errors, squashed patch that
changes how lack of the RAS DES capability is handled from
https://lore.kernel.org/linux-pci/20250304151814.6xu7cbpwpqrvcad5@thinkpad]
Signed-off-by: Krzysztof Wilczyński <[email protected]>

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