PCI: dwc: Convert struct pcie_port.msi_irq to an array

The Qualcomm DWC PCIe controller supports more than 32 MSI interrupts, but
they are routed to separate interrupts in groups of 32 vectors. To support
this configuration, change the msi_irq field to an array. Let the DWC core
handle all interrupts that were set in this array.

[bhelgaas: reorder, drop "irq" temporary to make patch cleaner]
Link: https://lore.kernel.org/r/20220707134733.2436629-3-dmitry.baryshkov@linaro.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Johan Hovold <johan+linaro@kernel.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>

7 files changed, 24 insertions, 17 deletions

diff --git a/drivers/pci/controller/dwc/pci-dra7xx.c b/drivers/pci/controller/dwc/pci-dra7xx.c
index a174b680b2a7..e2a6e18e533c 100644
--- a/drivers/pci/controller/dwc/pci-dra7xx.c
+++ b/drivers/pci/controller/dwc/pci-dra7xx.c
@@ -483,7 +483,7 @@ static int dra7xx_add_pcie_port(struct dra7xx_pcie *dra7xx,
 		return pp->irq;
 
 	/* MSI IRQ is muxed */
-	pp->msi_irq = -ENODEV;
+	pp->msi_irq[0] = -ENODEV;
 
 	ret = dra7xx_pcie_init_irq_domain(pp);
 	if (ret < 0)
diff --git a/drivers/pci/controller/dwc/pci-exynos.c b/drivers/pci/controller/dwc/pci-exynos.c
index 2044d191fba6..2ede426e3295 100644
--- a/drivers/pci/controller/dwc/pci-exynos.c
+++ b/drivers/pci/controller/dwc/pci-exynos.c
@@ -292,7 +292,7 @@ static int exynos_add_pcie_port(struct exynos_pcie *ep,
 	}
 
 	pp->ops = &exynos_pcie_host_ops;
-	pp->msi_irq = -ENODEV;
+	pp->msi_irq[0] = -ENODEV;
 
 	ret = dw_pcie_host_init(pp);
 	if (ret) {
diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index f96c4d00a53e..89316967c070 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -257,8 +257,13 @@ int dw_pcie_allocate_domains(struct dw_pcie_rp *pp)
 
 static void dw_pcie_free_msi(struct dw_pcie_rp *pp)
 {
-	if (pp->msi_irq > 0)
-		irq_set_chained_handler_and_data(pp->msi_irq, NULL, NULL);
+	u32 ctrl;
+
+	for (ctrl = 0; ctrl < MAX_MSI_CTRLS; ctrl++) {
+		if (pp->msi_irq[ctrl] > 0)
+			irq_set_chained_handler_and_data(pp->msi_irq[ctrl],
+							 NULL, NULL);
+	}
 
 	irq_domain_remove(pp->msi_domain);
 	irq_domain_remove(pp->irq_domain);
@@ -298,12 +303,12 @@ static int dw_pcie_msi_host_init(struct dw_pcie_rp *pp)
 	for (ctrl = 0; ctrl < num_ctrls; ctrl++)
 		pp->irq_mask[ctrl] = ~0;
 
-	if (!pp->msi_irq) {
-		pp->msi_irq = platform_get_irq_byname_optional(pdev, "msi");
-		if (pp->msi_irq < 0) {
-			pp->msi_irq = platform_get_irq(pdev, 0);
-			if (pp->msi_irq < 0)
-				return pp->msi_irq;
+	if (!pp->msi_irq[0]) {
+		pp->msi_irq[0] = platform_get_irq_byname_optional(pdev, "msi");
+		if (pp->msi_irq[0] < 0) {
+			pp->msi_irq[0] = platform_get_irq(pdev, 0);
+			if (pp->msi_irq[0] < 0)
+				return pp->msi_irq[0];
 		}
 	}
 
@@ -313,9 +318,11 @@ static int dw_pcie_msi_host_init(struct dw_pcie_rp *pp)
 	if (ret)
 		return ret;
 
-	if (pp->msi_irq > 0)
-		irq_set_chained_handler_and_data(pp->msi_irq,
-					    dw_chained_msi_isr, pp);
+	for (ctrl = 0; ctrl < num_ctrls; ctrl++) {
+		if (pp->msi_irq[ctrl] > 0)
+			irq_set_chained_handler_and_data(pp->msi_irq[ctrl],
+						    dw_chained_msi_isr, pp);
+	}
 
 	ret = dma_set_mask(dev, DMA_BIT_MASK(32));
 	if (ret)
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index 7c63204d23ba..16489c629ac2 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -200,7 +200,7 @@ struct dw_pcie_rp {
 	u32			io_size;
 	int			irq;
 	const struct dw_pcie_host_ops *ops;
-	int			msi_irq;
+	int			msi_irq[MAX_MSI_CTRLS];
 	struct irq_domain	*irq_domain;
 	struct irq_domain	*msi_domain;
 	dma_addr_t		msi_data;
diff --git a/drivers/pci/controller/dwc/pcie-keembay.c b/drivers/pci/controller/dwc/pcie-keembay.c
index 58f3caf75cff..f90f36bac018 100644
--- a/drivers/pci/controller/dwc/pcie-keembay.c
+++ b/drivers/pci/controller/dwc/pcie-keembay.c
@@ -338,7 +338,7 @@ static int keembay_pcie_add_pcie_port(struct keembay_pcie *pcie,
 	int ret;
 
 	pp->ops = &keembay_pcie_host_ops;
-	pp->msi_irq = -ENODEV;
+	pp->msi_irq[0] = -ENODEV;
 
 	ret = keembay_pcie_setup_msi_irq(pcie);
 	if (ret)
diff --git a/drivers/pci/controller/dwc/pcie-spear13xx.c b/drivers/pci/controller/dwc/pcie-spear13xx.c
index 7fd698da144e..9d933e0e12e6 100644
--- a/drivers/pci/controller/dwc/pcie-spear13xx.c
+++ b/drivers/pci/controller/dwc/pcie-spear13xx.c
@@ -172,7 +172,7 @@ static int spear13xx_add_pcie_port(struct spear13xx_pcie *spear13xx_pcie,
 	}
 
 	pp->ops = &spear13xx_pcie_host_ops;
-	pp->msi_irq = -ENODEV;
+	pp->msi_irq[0] = -ENODEV;
 
 	ret = dw_pcie_host_init(pp);
 	if (ret) {
diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c
index e497e6de8d15..53d26f7efa3c 100644
--- a/drivers/pci/controller/dwc/pcie-tegra194.c
+++ b/drivers/pci/controller/dwc/pcie-tegra194.c
@@ -2261,7 +2261,7 @@ static void tegra194_pcie_shutdown(struct platform_device *pdev)
 
 	disable_irq(pcie->pci.pp.irq);
 	if (IS_ENABLED(CONFIG_PCI_MSI))
-		disable_irq(pcie->pci.pp.msi_irq);
+		disable_irq(pcie->pci.pp.msi_irq[0]);
 
 	tegra194_pcie_pme_turnoff(pcie);
 	tegra_pcie_unconfig_controller(pcie);