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| author | Niklas Cassel <cassel@kernel.org> | 2026-03-12 16:02:33 +0300 |
|---|---|---|
| committer | Manivannan Sadhasivam <mani@kernel.org> | 2026-03-15 19:34:28 +0300 |
| commit | 33642e9e36dc084e4fc9245a266c9843bc8303b9 (patch) | |
| tree | 8aed7b10cdf5d10dad89163ff54c9b684e1cc452 /include | |
| parent | 489d3abb4117bdf4af8296c69f09493e21b70c28 (diff) | |
| download | linux-33642e9e36dc084e4fc9245a266c9843bc8303b9.tar.xz | |
PCI: endpoint: Introduce pci_epc_bar_type BAR_DISABLED
Add a pci_epc_bar_type BAR_DISABLED to more clearly differentiate from
BAR_RESERVED.
This BAR type will only be used to describe a BAR that the EPC driver
should disable, and will thus never be available to an EPF driver.
(Unlike BAR_RESERVED, which will never be disabled by default by an EPC
driver.)
Co-developed-by: Manikanta Maddireddy <mmaddireddy@nvidia.com>
Signed-off-by: Manikanta Maddireddy <mmaddireddy@nvidia.com>
Signed-off-by: Niklas Cassel <cassel@kernel.org>
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Tested-by: Koichiro Den <den@valinux.co.jp>
Tested-by: Manikanta Maddireddy <mmaddireddy@nvidia.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Manikanta Maddireddy <mmaddireddy@nvidia.com>
Link: https://patch.msgid.link/20260312130229.2282001-17-cassel@kernel.org
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/pci-epc.h | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/include/linux/pci-epc.h b/include/linux/pci-epc.h index ebcdf70aa9b9..334c2b7578d0 100644 --- a/include/linux/pci-epc.h +++ b/include/linux/pci-epc.h @@ -191,13 +191,21 @@ struct pci_epc { * @BAR_RESIZABLE: The BAR implements the PCI-SIG Resizable BAR Capability. * NOTE: An EPC driver can currently only set a single supported * size. - * @BAR_RESERVED: The BAR should not be touched by an EPF driver. + * @BAR_RESERVED: Used for HW-backed BARs (e.g. MSI-X table, DMA regs). The BAR + * should not be disabled by an EPC driver. The BAR should not be + * reprogrammed by an EPF driver. An EPF driver is allowed to + * disable the BAR if absolutely necessary. (However, right now + * there is no EPC operation to disable a BAR that has not been + * programmed using pci_epc_set_bar().) + * @BAR_DISABLED: The BAR should be disabled by an EPC driver. The BAR will be + * unavailable to an EPF driver. */ enum pci_epc_bar_type { BAR_PROGRAMMABLE = 0, BAR_FIXED, BAR_RESIZABLE, BAR_RESERVED, + BAR_DISABLED, }; /** |