Commits
Sinan Kaya committed 60db3a4d8cc
PCI: Enable PCIe Extended Tags if supported Every PCIe device can generate 5-bit transaction Tags, which allow up to 32 concurrent requests. Some devices can generate 8-bit Extended Tags, which allow up to 256 concurrent requests. Per the ECN mentioned below, all PCIe Receivers are expected to support Extended Tags, so devices are allowed (but not required) to enable them by default. If a device supports Extended Tags but does not enable them by default, enable them. This allows the device to have up to 256 outstanding transactions at a time, which may improve performance. [bhelgaas: changelog, check for PCIe device] Link: https://pcisig.com/sites/default/files/specification_documents/ECN_Extended_Tag_Enable_Default_05Sept2008_final.pdf Signed-off-by: Sinan Kaya <okaya@codeaurora.org> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>