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misc: pci_endpoint_test: Gate doorbell test on dynamic inbound mapping

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The doorbell test relies on the endpoint being able to update inbound
translations at runtime so the host can reach the doorbell target
through a BAR mapping.

If the endpoint does not advertise CAP_DYNAMIC_INBOUND_MAPPING, return
-EOPNOTSUPP from PCITEST_DOORBELL.

This avoids confusing failures in user space and kselftests when the
required capability is not available.

Suggested-by: Niklas Cassel <cassel@kernel.org>
Signed-off-by: Koichiro Den <den@valinux.co.jp>
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Reviewed-by: Niklas Cassel <cassel@kernel.org>
Link: https://patch.msgid.link/20260215150334.3391943-3-den@valinux.co.jp
This commit is contained in:
Koichiro Den
2026-02-16 00:03:33 +09:00
committed by Manivannan Sadhasivam
parent 9a940a3d08
commit 51fba4aa66
1 changed files with 4 additions and 0 deletions
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4
drivers/misc/pci_endpoint_test.c
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@@ -84,6 +84,7 @@
#define CAP_MSIX BIT(2)
#define CAP_INTX BIT(3)
#define CAP_SUBRANGE_MAPPING BIT(4)
#define CAP_DYNAMIC_INBOUND_MAPPING BIT(5)
#define PCI_ENDPOINT_TEST_DB_BAR 0x34
#define PCI_ENDPOINT_TEST_DB_OFFSET 0x38
@@ -1060,6 +1061,9 @@ static int pci_endpoint_test_doorbell(struct pci_endpoint_test *test)
u32 addr;
int left;
if (!(test->ep_caps & CAP_DYNAMIC_INBOUND_MAPPING))
return -EOPNOTSUPP;
if (irq_type < PCITEST_IRQ_TYPE_INTX ||
irq_type > PCITEST_IRQ_TYPE_MSIX) {
dev_err(dev, "Invalid IRQ type\n");