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misc: pci_endpoint_test: Give reserved BARs a distinct error code

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Give reserved BARs a distinct error code, such that the pci_endpoint_test
selftest will be able to skip test cases that are run against reserved
BARs.

Signed-off-by: Niklas Cassel <cassel@kernel.org>
[mani: Used __fls(CAP_BAR0_RESERVED) instead of PCI_ENDPOINT_CAP_BAR0_RESERVED_BIT]
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Tested-by: Manikanta Maddireddy <mmaddireddy@nvidia.com>
Tested-by: Koichiro Den <den@valinux.co.jp>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260312130229.2282001-21-cassel@kernel.org
This commit is contained in:
Niklas Cassel
2026-03-12 14:02:37 +01:00
committed by Manivannan Sadhasivam
parent 50a1fd6e5e
commit c3f33af67e
1 changed files with 18 additions and 2 deletions
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20
drivers/misc/pci_endpoint_test.c
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@@ -85,6 +85,12 @@
#define CAP_INTX BIT(3)
#define CAP_SUBRANGE_MAPPING BIT(4)
#define CAP_DYNAMIC_INBOUND_MAPPING BIT(5)
#define CAP_BAR0_RESERVED BIT(6)
#define CAP_BAR1_RESERVED BIT(7)
#define CAP_BAR2_RESERVED BIT(8)
#define CAP_BAR3_RESERVED BIT(9)
#define CAP_BAR4_RESERVED BIT(10)
#define CAP_BAR5_RESERVED BIT(11)
#define PCI_ENDPOINT_TEST_DB_BAR 0x34
#define PCI_ENDPOINT_TEST_DB_OFFSET 0x38
@@ -276,6 +282,11 @@ static int pci_endpoint_test_request_irq(struct pci_endpoint_test *test)
return ret;
}
static bool bar_is_reserved(struct pci_endpoint_test *test, enum pci_barno bar)
{
return test->ep_caps & BIT(bar + __fls(CAP_BAR0_RESERVED));
}
static const u32 bar_test_pattern[] = {
0xA0A0A0A0,
0xA1A1A1A1,
@@ -404,7 +415,7 @@ static int pci_endpoint_test_bars(struct pci_endpoint_test *test)
/* Write all BARs in order (without reading). */
for (bar = 0; bar < PCI_STD_NUM_BARS; bar++)
if (test->bar[bar])
if (test->bar[bar] && !bar_is_reserved(test, bar))
pci_endpoint_test_bars_write_bar(test, bar);
/*
@@ -414,7 +425,7 @@ static int pci_endpoint_test_bars(struct pci_endpoint_test *test)
* (Reading back the BAR directly after writing can not detect this.)
*/
for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) {
if (test->bar[bar]) {
if (test->bar[bar] && !bar_is_reserved(test, bar)) {
ret = pci_endpoint_test_bars_read_bar(test, bar);
if (ret)
return ret;
@@ -1143,6 +1154,11 @@ static long pci_endpoint_test_ioctl(struct file *file, unsigned int cmd,
if (is_am654_pci_dev(pdev) && bar == BAR_0)
goto ret;
if (bar_is_reserved(test, bar)) {
ret = -ENOBUFS;
goto ret;
}
if (cmd == PCITEST_BAR)
ret = pci_endpoint_test_bar(test, bar);
else