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| author | Niklas Cassel <niklas.cassel@wdc.com> | 2023-12-15 11:59:51 +0100 |
|---|---|---|
| committer | Krzysztof Wilczyński <kwilczynski@kernel.org> | 2024-01-06 05:00:08 +0000 |
| commit | 516f366434e1db71b83c77b970cfcc0804671e1c (patch) | |
| tree | 9c4564f5bffc26931adb7f33111fafb23fb745c9 /drivers/misc | |
| parent | 9ca65c373f4451fdf2f82ebc30b17185253aec8f (diff) | |
| download | linux-516f366434e1db71b83c77b970cfcc0804671e1c.tar.gz | |
misc: pci_endpoint_test: Use a unique test pattern for each BAR
Use a unique test pattern for each BAR in. This makes it easier to
detect/debug address translation issues, since a developer can dump
the backing memory on the EP side, using e.g. devmem, to verify that
the address translation for each BAR is actually correct.
Link: https://lore.kernel.org/linux-pci/20231215105952.1531683-1-nks@flawful.org
Signed-off-by: Niklas Cassel <niklas.cassel@wdc.com>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Diffstat (limited to 'drivers/misc')
| -rw-r--r-- | drivers/misc/pci_endpoint_test.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/drivers/misc/pci_endpoint_test.c b/drivers/misc/pci_endpoint_test.c index af519088732d9a..412749fed8cf3b 100644 --- a/drivers/misc/pci_endpoint_test.c +++ b/drivers/misc/pci_endpoint_test.c @@ -263,6 +263,15 @@ fail: return false; } +static const u32 bar_test_pattern[] = { + 0xA0A0A0A0, + 0xA1A1A1A1, + 0xA2A2A2A2, + 0xA3A3A3A3, + 0xA4A4A4A4, + 0xA5A5A5A5, +}; + static bool pci_endpoint_test_bar(struct pci_endpoint_test *test, enum pci_barno barno) { @@ -280,11 +289,12 @@ static bool pci_endpoint_test_bar(struct pci_endpoint_test *test, size = 0x4; for (j = 0; j < size; j += 4) - pci_endpoint_test_bar_writel(test, barno, j, 0xA0A0A0A0); + pci_endpoint_test_bar_writel(test, barno, j, + bar_test_pattern[barno]); for (j = 0; j < size; j += 4) { val = pci_endpoint_test_bar_readl(test, barno, j); - if (val != 0xA0A0A0A0) + if (val != bar_test_pattern[barno]) return false; } |