[PATCH v15 07/15] PCI: endpoint: pci-ep-msi: Add MSI address/data pair mutable check

[Frank Li]

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 from v14 to v15
- none

change from  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 549b55b864d0e..c0e2d806ee658 100644
--- a/drivers/pci/endpoint/pci-ep-msi.c
+++ b/drivers/pci/endpoint/pci-ep-msi.c
@@ -44,6 +44,14 @@ 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