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misc: pci_endpoint_test: Use a unique test pattern for each BAR

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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>
This commit is contained in:
Niklas Cassel
2023-12-15 11:59:51 +01:00
committed by Krzysztof Wilczyński
parent 9ca65c373f
commit 516f366434
1 changed files with 12 additions and 2 deletions
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14
drivers/misc/pci_endpoint_test.c
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@@ -263,6 +263,15 @@ fail:
return false; 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, static bool pci_endpoint_test_bar(struct pci_endpoint_test *test,
enum pci_barno barno) enum pci_barno barno)
{ {
@@ -280,11 +289,12 @@ static bool pci_endpoint_test_bar(struct pci_endpoint_test *test,
size = 0x4; size = 0x4;
for (j = 0; j < size; j += 4) 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) { for (j = 0; j < size; j += 4) {
val = pci_endpoint_test_bar_readl(test, barno, j); val = pci_endpoint_test_bar_readl(test, barno, j);
if (val != 0xA0A0A0A0) if (val != bar_test_pattern[barno])
return false; return false;
} }