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PCI: endpoint: pci-epf-test: Advertise dynamic inbound mapping support

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The doorbell test requires the EPC driver to support dynamic inbound
mapping so the host can map the doorbell target address into a BAR
aperture.

Expose epc_features->dynamic_inbound_mapping via a new
CAP_DYNAMIC_INBOUND_MAPPING bit in the pci-epf-test capability register,
so the host-side pci_endpoint_test driver can detect missing support and
return -EOPNOTSUPP instead of running the test fruitlessly.

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/20260215150334.3391943-2-den@valinux.co.jp
This commit is contained in:
Koichiro Den 2026-02-16 00:03:32 +09:00 committed by Manivannan Sadhasivam
parent 1cba96c0a7
commit 9a940a3d08
1 changed files with 4 additions and 0 deletions
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4
drivers/pci/endpoint/functions/pci-epf-test.c
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@ -64,6 +64,7 @@
#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_EPF_TEST_BAR_SUBRANGE_NSUB 2
@ -1104,6 +1105,9 @@ static void pci_epf_test_set_capabilities(struct pci_epf *epf)
if (epf_test->epc_features->intx_capable)
caps |= CAP_INTX;
if (epf_test->epc_features->dynamic_inbound_mapping)
caps |= CAP_DYNAMIC_INBOUND_MAPPING;
if (epf_test->epc_features->dynamic_inbound_mapping &&
epf_test->epc_features->subrange_mapping)
caps |= CAP_SUBRANGE_MAPPING;