On some of Qualcomm platforms each group of 32 MSI vectors is routed to the
separate GIC interrupt. Implement support for such configuraions by
parsing "msi0" ... "msi7" interrupts and attaching them to the chained
handler.
Note, that if DT doesn't list an array of MSI interrupts and uses single
"msi" IRQ, the driver will limit the amount of supported MSI vectors
accordingly (to 32).
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
---
.../pci/controller/dwc/pcie-designware-host.c | 33 ++++++++++++++++++-
drivers/pci/controller/dwc/pcie-designware.h | 1 +
2 files changed, 33 insertions(+), 1 deletion(-)
diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index 6b0c7b75391f..258bafa306dc 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -291,7 +291,8 @@ static void dw_pcie_msi_init(struct pcie_port *pp)
static int dw_pcie_msi_host_init(struct pcie_port *pp)
{
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
- struct platform_device *pdev = to_platform_device(pci->dev);
+ struct device *dev = pci->dev;
+ struct platform_device *pdev = to_platform_device(dev);
int ret;
u32 ctrl, num_ctrls;
@@ -299,6 +300,36 @@ static int dw_pcie_msi_host_init(struct pcie_port *pp)
for (ctrl = 0; ctrl < num_ctrls; ctrl++)
pp->irq_mask[ctrl] = ~0;
+ if (pp->has_split_msi_irq) {
+ char irq_name[] = "msiXX";
+ int irq;
+
+ if (!pp->msi_irq[0]) {
+ irq = platform_get_irq_byname_optional(pdev, irq_name);
+ if (irq == -ENXIO) {
+ num_ctrls = 1;
+ pp->num_vectors = min((u32)MAX_MSI_IRQS_PER_CTRL, pp->num_vectors);
+ dev_warn(dev, "No additional MSI IRQs, limiting amount of MSI vectors to %d\n",
+ pp->num_vectors);
+ } else {
+ pp->msi_irq[0] = irq;
+ }
+ }
+
+ /* If we fallback to the single MSI ctrl IRQ, this loop will be skipped as num_ctrls is 1 */
+ for (ctrl = 1; ctrl < num_ctrls; ctrl++) {
+ if (pp->msi_irq[ctrl])
+ continue;
+
+ snprintf(irq_name, sizeof(irq_name), "msi%d", ctrl);
+ irq = platform_get_irq_byname(pdev, irq_name);
+ if (irq < 0)
+ return irq;
+
+ pp->msi_irq[ctrl] = irq;
+ }
+ }
+
if (!pp->msi_irq[0]) {
int irq = platform_get_irq_byname_optional(pdev, "msi");
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index 9c1a38b0a6b3..3aa840a5b19c 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -179,6 +179,7 @@ struct dw_pcie_host_ops {
struct pcie_port {
bool has_msi_ctrl:1;
+ bool has_split_msi_irq:1;
u64 cfg0_base;
void __iomem *va_cfg0_base;
u32 cfg0_size;
--
2.35.1
