On some platform, external MSI domain is using instead of the one
created by designware driver. For instance, if using GIC-V3-ITS
as a MSI domain, we only need set msi-map in the devicetree but
never need any bit in the designware driver to handle MSI stuff.
So skip allocating its own MSI domain for that case.
Signed-off-by: Shawn Lin <shawn.lin@xxxxxxxxxxxxxx>
Signed-off-by: Simon Xue <xxm@xxxxxxxxxxxxxx>
---
drivers/pci/controller/dwc/pcie-designware-host.c | 10 +++++++++-
drivers/pci/controller/dwc/pcie-designware.h | 1 +
2 files changed, 10 insertions(+), 1 deletion(-)
diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index 395feb8..e78d094 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -257,6 +257,10 @@ int dw_pcie_allocate_domains(struct pcie_port *pp)
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
struct fwnode_handle *fwnode = of_node_to_fwnode(pci->dev->of_node);
+ /* Rely on the external MSI domain */
+ if (pp->msi_ext)
+ return 0;
+
pp->irq_domain = irq_domain_create_linear(fwnode, pp->num_vectors,
&dw_pcie_msi_domain_ops, pp);
if (!pp->irq_domain) {
@@ -278,6 +282,9 @@ int dw_pcie_allocate_domains(struct pcie_port *pp)
void dw_pcie_free_msi(struct pcie_port *pp)
{
+ if (pp->msi_ext)
+ return;
+
if (pp->msi_irq) {
irq_set_chained_handler(pp->msi_irq, NULL);
irq_set_handler_data(pp->msi_irq, NULL);
@@ -413,7 +420,8 @@ int dw_pcie_host_init(struct pcie_port *pp)
if (ret)
pci->num_viewport = 2;
- if (pci_msi_enabled()) {
+ if (pci_msi_enabled() &&
+ !pp->msi_ext) {
/*
* If a specific SoC driver needs to change the
* default number of vectors, it needs to implement
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index a22ea59..eeafa52 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -201,6 +201,7 @@ struct pcie_port {
u32 irq_mask[MAX_MSI_CTRLS];
struct pci_bus *root_bus;
raw_spinlock_t lock;
+ int msi_ext;
DECLARE_BITMAP(msi_irq_in_use, MAX_MSI_IRQS);
};
--
1.9.1
