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@nxp.com --- change from v14 to v16 - 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;