Some MSI controller change address/data pair when irq_set_affinity().
Current PCI endpoint can't support this type MSI controller. So add flag
MSI_FLAG_MUTABLE in include/linux/msi.h and check it when allocate
doorbell.
Signed-off-by: Frank Li <Frank.Li@xxxxxxx>
---
change fomr v13 to v14
- bring v10 back
Change from v9 to v10
- new patch
---
drivers/pci/endpoint/pci-ep-msi.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/pci/endpoint/pci-ep-msi.c b/drivers/pci/endpoint/pci-ep-msi.c
index 53820744ce502..e3ec53c2fefbe 100644
--- a/drivers/pci/endpoint/pci-ep-msi.c
+++ b/drivers/pci/endpoint/pci-ep-msi.c
@@ -43,6 +43,14 @@ int pci_epf_alloc_doorbell(struct pci_epf *epf, u16 num_db)
dev_set_msi_domain(dev, dom);
+ if (!irq_domain_is_msi_parent(dom))
+ return -EINVAL;
+
+ if (!irq_domain_is_msi_immutable(dom)) {
+ dev_err(dev, "Can't support mutable address/data pair MSI controller\n");
+ return -EINVAL;
+ }
+
msg = kcalloc(num_db, sizeof(struct pci_epf_doorbell_msg), GFP_KERNEL);
if (!msg)
return -ENOMEM;
--
2.34.1
