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PCI: endpoint: Introduce pci_epc_bar_type BAR_DISABLED

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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
This commit is contained in:
Niklas Cassel
2026-03-12 14:02:33 +01:00
committed by Manivannan Sadhasivam
parent 489d3abb41
commit 33642e9e36
2 changed files with 12 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/pci/endpoint/pci-epc-core.c
+3 -2
View File
@@ -103,8 +103,9 @@ enum pci_barno pci_epc_get_next_free_bar(const struct pci_epc_features
bar++;
for (i = bar; i < PCI_STD_NUM_BARS; i++) {
/* If the BAR is not reserved, return it. */
if (epc_features->bar[i].type != BAR_RESERVED)
/* If the BAR is not reserved or disabled, return it. */
if (epc_features->bar[i].type != BAR_RESERVED &&
epc_features->bar[i].type != BAR_DISABLED)
return i;
}
include/linux/pci-epc.h
+9 -1
View File
@@ -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,
};
/**