PCI: endpoint: pci-epf-test: Handle endianness properly

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The struct pci_epf_test_reg is the actual data in pci-epf-test's test_reg
BAR (usually BAR0), which the host uses to send commands (etc.), and which
pci-epf-test uses to send back status codes.

pci-epf-test currently reads and writes this data without any endianness
conversion functions, which means that pci-epf-test is completely broken
on big-endian endpoint systems.

PCI devices are inherently little-endian, and the data stored in the PCI
BARs should be in little-endian.

Use endianness conversion functions when reading and writing data to
struct pci_epf_test_reg so that pci-epf-test will behave correctly on
big-endian endpoint systems.

Fixes: 349e7a85b2 ("PCI: endpoint: functions: Add an EP function to test PCI")
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Niklas Cassel <cassel@kernel.org>
Link: https://lore.kernel.org/r/20250127161242.104651-2-cassel@kernel.org
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>

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Niklas Cassel 2025-01-27 17:12:42 +01:00 • committed by Krzysztof Wilczyński

parent 2014c95afe

commit 3c936e0ec0

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drivers/pci/endpoint/functions/pci-epf-test.c

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