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| author | Niklas Cassel <cassel@kernel.org> | 2026-01-30 12:30:39 +0100 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2026-01-30 11:17:09 -0600 |
| commit | ffcc4850a16133d8db0f11ee6dde319201800451 (patch) | |
| tree | 56e810356c5b47443e0d924fddbbaf5f70935416 /Documentation/PCI | |
| parent | c17b9046faf7d1f3b8bb992e4d53da873dc478fc (diff) | |
PCI: endpoint: pci-epf-test: Allow overriding default BAR sizes
Add bar{0,1,2,3,4,5}_size attributes in configfs, so that the user is not
restricted to run pci-epf-test with the hardcoded BAR size values defined
in pci-epf-test.c.
This code is shamelessly more or less copy pasted from pci-epf-vntb.c
Signed-off-by: Niklas Cassel <cassel@kernel.org>
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Koichiro Den <den@valinux.co.jp>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260130113038.2143947-2-cassel@kernel.org
Diffstat (limited to 'Documentation/PCI')
| -rw-r--r-- | Documentation/PCI/endpoint/pci-test-howto.rst | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/Documentation/PCI/endpoint/pci-test-howto.rst b/Documentation/PCI/endpoint/pci-test-howto.rst index dd66858cde46..a822866b1fb0 100644 --- a/Documentation/PCI/endpoint/pci-test-howto.rst +++ b/Documentation/PCI/endpoint/pci-test-howto.rst @@ -84,6 +84,25 @@ device, the following commands can be used:: # echo 32 > functions/pci_epf_test/func1/msi_interrupts # echo 2048 > functions/pci_epf_test/func1/msix_interrupts +By default, pci-epf-test uses the following BAR sizes:: + + # grep . functions/pci_epf_test/func1/pci_epf_test.0/bar?_size + functions/pci_epf_test/func1/pci_epf_test.0/bar0_size:131072 + functions/pci_epf_test/func1/pci_epf_test.0/bar1_size:131072 + functions/pci_epf_test/func1/pci_epf_test.0/bar2_size:131072 + functions/pci_epf_test/func1/pci_epf_test.0/bar3_size:131072 + functions/pci_epf_test/func1/pci_epf_test.0/bar4_size:131072 + functions/pci_epf_test/func1/pci_epf_test.0/bar5_size:1048576 + +The user can override a default value using e.g.:: + # echo 1048576 > functions/pci_epf_test/func1/pci_epf_test.0/bar1_size + +Overriding the default BAR sizes can only be done before binding the +pci-epf-test device to a PCI endpoint controller driver. + +Note: Some endpoint controllers might have fixed-size BARs or reserved BARs; +for such controllers, the corresponding BAR size in configfs will be ignored. + Binding pci-epf-test Device to EP Controller -------------------------------------------- |