Merge branch 'remotes/lorenzo/pci/msi'

- Convert tegra to MSI domains (Marc Zyngier)

- Use rcar controller address as MSI doorbell instead of allocating a page
  (Marc Zyngier)

- Convert rcar to MSI domains (Marc Zyngier)

- Use xilinx port structure as MSI doorbell instead of allocating a page
  (Marc Zyngier)

- Convert xilinx to MSI domains (Marc Zyngier)

- Remove unused Hyper-V msi_controller structure (Marc Zyngier)

- Remove unused PCI core msi_controller support (Marc Zyngier)

- Remove struct msi_controller (Marc Zyngier)

- Remove unused default_teardown_msi_irqs() (Marc Zyngier)

- Let host bridges declare their reliance on MSI domains (Marc Zyngier)

- Make pci_host_common_probe() declare its reliance on MSI domains (Marc
  Zyngier)

- Advertise mediatek lack of built-in MSI handling (Thomas Gleixner)

- Document ways of ending up with NO_MSI (Marc Zyngier)

- Refactor HT advertising of NO_MSI flag (Marc Zyngier)

* remotes/lorenzo/pci/msi:
  PCI: Refactor HT advertising of NO_MSI flag
  PCI/MSI: Document the various ways of ending up with NO_MSI
  PCI: mediatek: Advertise lack of built-in MSI handling
  PCI/MSI: Make pci_host_common_probe() declare its reliance on MSI domains
  PCI/MSI: Let PCI host bridges declare their reliance on MSI domains
  PCI/MSI: Kill default_teardown_msi_irqs()
  PCI/MSI: Kill msi_controller structure
  PCI/MSI: Drop use of msi_controller from core code
  PCI: hv: Drop msi_controller structure
  PCI: xilinx: Convert to MSI domains
  PCI: xilinx: Don't allocate extra memory for the MSI capture address
  PCI: rcar: Convert to MSI domains
  PCI: rcar: Don't allocate extra memory for the MSI capture address
  PCI: tegra: Convert to MSI domains

10 files changed, 487 insertions, 540 deletions

diff --git a/drivers/pci/controller/Kconfig b/drivers/pci/controller/Kconfig
index 1e925ac47279..2f2c8a1729f9 100644
--- a/drivers/pci/controller/Kconfig
+++ b/drivers/pci/controller/Kconfig
@@ -41,7 +41,6 @@ config PCI_TEGRA
 	bool "NVIDIA Tegra PCIe controller"
 	depends on ARCH_TEGRA || COMPILE_TEST
 	depends on PCI_MSI_IRQ_DOMAIN
-	select PCI_MSI_ARCH_FALLBACKS
 	help
 	  Say Y here if you want support for the PCIe host controller found
 	  on NVIDIA Tegra SoCs.
@@ -59,7 +58,6 @@ config PCIE_RCAR_HOST
 	bool "Renesas R-Car PCIe host controller"
 	depends on ARCH_RENESAS || COMPILE_TEST
 	depends on PCI_MSI_IRQ_DOMAIN
-	select PCI_MSI_ARCH_FALLBACKS
 	help
 	  Say Y here if you want PCIe controller support on R-Car SoCs in host
 	  mode.
@@ -88,7 +86,7 @@ config PCI_HOST_GENERIC
 config PCIE_XILINX
 	bool "Xilinx AXI PCIe host bridge support"
 	depends on OF || COMPILE_TEST
-	select PCI_MSI_ARCH_FALLBACKS
+	depends on PCI_MSI_IRQ_DOMAIN
 	help
 	  Say 'Y' here if you want kernel to support the Xilinx AXI PCIe
 	  Host Bridge driver.
diff --git a/drivers/pci/controller/pci-host-common.c b/drivers/pci/controller/pci-host-common.c
index 6ab694f8d283..d3924a44db02 100644
--- a/drivers/pci/controller/pci-host-common.c
+++ b/drivers/pci/controller/pci-host-common.c
@@ -79,6 +79,7 @@ int pci_host_common_probe(struct platform_device *pdev)
 
 	bridge->sysdata = cfg;
 	bridge->ops = (struct pci_ops *)&ops->pci_ops;
+	bridge->msi_domain = true;
 
 	return pci_host_probe(bridge);
 }
diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c
index 27a17a1e4a7c..2c014ba7ed4b 100644
--- a/drivers/pci/controller/pci-hyperv.c
+++ b/drivers/pci/controller/pci-hyperv.c
@@ -473,7 +473,6 @@ struct hv_pcibus_device {
 	struct list_head dr_list;
 
 	struct msi_domain_info msi_info;
-	struct msi_controller msi_chip;
 	struct irq_domain *irq_domain;
 
 	spinlock_t retarget_msi_interrupt_lock;
@@ -1866,9 +1865,6 @@ static int create_root_hv_pci_bus(struct hv_pcibus_device *hbus)
 	if (!hbus->pci_bus)
 		return -ENODEV;
 
-	hbus->pci_bus->msi = &hbus->msi_chip;
-	hbus->pci_bus->msi->dev = &hbus->hdev->device;
-
 	pci_lock_rescan_remove();
 	pci_scan_child_bus(hbus->pci_bus);
 	hv_pci_assign_numa_node(hbus);
diff --git a/drivers/pci/controller/pci-tegra.c b/drivers/pci/controller/pci-tegra.c
index 8fcabed7c6a6..8069bd9232d4 100644
--- a/drivers/pci/controller/pci-tegra.c
+++ b/drivers/pci/controller/pci-tegra.c
@@ -21,6 +21,7 @@
 #include <linux/interrupt.h>
 #include <linux/iopoll.h>
 #include <linux/irq.h>
+#include <linux/irqchip/chained_irq.h>
 #include <linux/irqdomain.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
@@ -78,23 +79,8 @@
 #define AFI_MSI_FPCI_BAR_ST	0x64
 #define AFI_MSI_AXI_BAR_ST	0x68
 
-#define AFI_MSI_VEC0		0x6c
-#define AFI_MSI_VEC1		0x70
-#define AFI_MSI_VEC2		0x74
-#define AFI_MSI_VEC3		0x78
-#define AFI_MSI_VEC4		0x7c
-#define AFI_MSI_VEC5		0x80
-#define AFI_MSI_VEC6		0x84
-#define AFI_MSI_VEC7		0x88
-
-#define AFI_MSI_EN_VEC0		0x8c
-#define AFI_MSI_EN_VEC1		0x90
-#define AFI_MSI_EN_VEC2		0x94
-#define AFI_MSI_EN_VEC3		0x98
-#define AFI_MSI_EN_VEC4		0x9c
-#define AFI_MSI_EN_VEC5		0xa0
-#define AFI_MSI_EN_VEC6		0xa4
-#define AFI_MSI_EN_VEC7		0xa8
+#define AFI_MSI_VEC(x)		(0x6c + ((x) * 4))
+#define AFI_MSI_EN_VEC(x)	(0x8c + ((x) * 4))
 
 #define AFI_CONFIGURATION		0xac
 #define  AFI_CONFIGURATION_EN_FPCI		(1 << 0)
@@ -280,10 +266,10 @@
 #define LINK_RETRAIN_TIMEOUT 100000 /* in usec */
 
 struct tegra_msi {
-	struct msi_controller chip;
 	DECLARE_BITMAP(used, INT_PCI_MSI_NR);
 	struct irq_domain *domain;
-	struct mutex lock;
+	struct mutex map_lock;
+	spinlock_t mask_lock;
 	void *virt;
 	dma_addr_t phys;
 	int irq;
@@ -333,11 +319,6 @@ struct tegra_pcie_soc {
 	} ectl;
 };
 
-static inline struct tegra_msi *to_tegra_msi(struct msi_controller *chip)
-{
-	return container_of(chip, struct tegra_msi, chip);
-}
-
 struct tegra_pcie {
 	struct device *dev;
 
@@ -372,6 +353,11 @@ struct tegra_pcie {
 	struct dentry *debugfs;
 };
 
+static inline struct tegra_pcie *msi_to_pcie(struct tegra_msi *msi)
+{
+	return container_of(msi, struct tegra_pcie, msi);
+}
+
 struct tegra_pcie_port {
 	struct tegra_pcie *pcie;
 	struct device_node *np;
@@ -1432,7 +1418,6 @@ static void tegra_pcie_phys_put(struct tegra_pcie *pcie)
 	}
 }
 
-
 static int tegra_pcie_get_resources(struct tegra_pcie *pcie)
 {
 	struct device *dev = pcie->dev;
@@ -1509,6 +1494,7 @@ static int tegra_pcie_get_resources(struct tegra_pcie *pcie)
 phys_put:
 	if (soc->program_uphy)
 		tegra_pcie_phys_put(pcie);
+
 	return err;
 }
 
@@ -1551,161 +1537,227 @@ static void tegra_pcie_pme_turnoff(struct tegra_pcie_port *port)
 	afi_writel(pcie, val, AFI_PCIE_PME);
 }
 
-static int tegra_msi_alloc(struct tegra_msi *chip)
-{
-	int msi;
-
-	mutex_lock(&chip->lock);
-
-	msi = find_first_zero_bit(chip->used, INT_PCI_MSI_NR);
-	if (msi < INT_PCI_MSI_NR)
-		set_bit(msi, chip->used);
-	else
-		msi = -ENOSPC;
-
-	mutex_unlock(&chip->lock);
-
-	return msi;
-}
-
-static void tegra_msi_free(struct tegra_msi *chip, unsigned long irq)
+static void tegra_pcie_msi_irq(struct irq_desc *desc)
 {
-	struct device *dev = chip->chip.dev;
-
-	mutex_lock(&chip->lock);
-
-	if (!test_bit(irq, chip->used))
-		dev_err(dev, "trying to free unused MSI#%lu\n", irq);
-	else
-		clear_bit(irq, chip->used);
-
-	mutex_unlock(&chip->lock);
-}
-
-static irqreturn_t tegra_pcie_msi_irq(int irq, void *data)
-{
-	struct tegra_pcie *pcie = data;
-	struct device *dev = pcie->dev;
+	struct tegra_pcie *pcie = irq_desc_get_handler_data(desc);
+	struct irq_chip *chip = irq_desc_get_chip(desc);
 	struct tegra_msi *msi = &pcie->msi;
-	unsigned int i, processed = 0;
+	struct device *dev = pcie->dev;
+	unsigned int i;
+
+	chained_irq_enter(chip, desc);
 
 	for (i = 0; i < 8; i++) {
-		unsigned long reg = afi_readl(pcie, AFI_MSI_VEC0 + i * 4);
+		unsigned long reg = afi_readl(pcie, AFI_MSI_VEC(i));
 
 		while (reg) {
 			unsigned int offset = find_first_bit(&reg, 32);
 			unsigned int index = i * 32 + offset;
 			unsigned int irq;
 
-			/* clear the interrupt */
-			afi_writel(pcie, 1 << offset, AFI_MSI_VEC0 + i * 4);
-
-			irq = irq_find_mapping(msi->domain, index);
+			irq = irq_find_mapping(msi->domain->parent, index);
 			if (irq) {
-				if (test_bit(index, msi->used))
-					generic_handle_irq(irq);
-				else
-					dev_info(dev, "unhandled MSI\n");
+				generic_handle_irq(irq);
 			} else {
 				/*
 				 * that's weird who triggered this?
 				 * just clear it
 				 */
 				dev_info(dev, "unexpected MSI\n");
+				afi_writel(pcie, BIT(index % 32), AFI_MSI_VEC(index));
 			}
 
 			/* see if there's any more pending in this vector */
-			reg = afi_readl(pcie, AFI_MSI_VEC0 + i * 4);
-
-			processed++;
+			reg = afi_readl(pcie, AFI_MSI_VEC(i));
 		}
 	}
 
-	return processed > 0 ? IRQ_HANDLED : IRQ_NONE;
+	chained_irq_exit(chip, desc);
 }
 
-static int tegra_msi_setup_irq(struct msi_controller *chip,
-			       struct pci_dev *pdev, struct msi_desc *desc)
+static void tegra_msi_top_irq_ack(struct irq_data *d)
 {
-	struct tegra_msi *msi = to_tegra_msi(chip);
-	struct msi_msg msg;
-	unsigned int irq;
-	int hwirq;
+	irq_chip_ack_parent(d);
+}
 
-	hwirq = tegra_msi_alloc(msi);
-	if (hwirq < 0)
-		return hwirq;
+static void tegra_msi_top_irq_mask(struct irq_data *d)
+{
+	pci_msi_mask_irq(d);
+	irq_chip_mask_parent(d);
+}
 
-	irq = irq_create_mapping(msi->domain, hwirq);
-	if (!irq) {
-		tegra_msi_free(msi, hwirq);
-		return -EINVAL;
-	}
+static void tegra_msi_top_irq_unmask(struct irq_data *d)
+{
+	pci_msi_unmask_irq(d);
+	irq_chip_unmask_parent(d);
+}
+
+static struct irq_chip tegra_msi_top_chip = {
+	.name		= "Tegra PCIe MSI",
+	.irq_ack	= tegra_msi_top_irq_ack,
+	.irq_mask	= tegra_msi_top_irq_mask,
+	.irq_unmask	= tegra_msi_top_irq_unmask,
+};
 
-	irq_set_msi_desc(irq, desc);
+static void tegra_msi_irq_ack(struct irq_data *d)
+{
+	struct tegra_msi *msi = irq_data_get_irq_chip_data(d);
+	struct tegra_pcie *pcie = msi_to_pcie(msi);
+	unsigned int index = d->hwirq / 32;
 
-	msg.address_lo = lower_32_bits(msi->phys);
-	msg.address_hi = upper_32_bits(msi->phys);
-	msg.data = hwirq;
+	/* clear the interrupt */
+	afi_writel(pcie, BIT(d->hwirq % 32), AFI_MSI_VEC(index));
+}
 
-	pci_write_msi_msg(irq, &msg);
+static void tegra_msi_irq_mask(struct irq_data *d)
+{
+	struct tegra_msi *msi = irq_data_get_irq_chip_data(d);
+	struct tegra_pcie *pcie = msi_to_pcie(msi);
+	unsigned int index = d->hwirq / 32;
+	unsigned long flags;
+	u32 value;
 
-	return 0;
+	spin_lock_irqsave(&msi->mask_lock, flags);
+	value = afi_readl(pcie, AFI_MSI_EN_VEC(index));
+	value &= ~BIT(d->hwirq % 32);
+	afi_writel(pcie, value, AFI_MSI_EN_VEC(index));
+	spin_unlock_irqrestore(&msi->mask_lock, flags);
 }
 
-static void tegra_msi_teardown_irq(struct msi_controller *chip,
-				   unsigned int irq)
+static void tegra_msi_irq_unmask(struct irq_data *d)
 {
-	struct tegra_msi *msi = to_tegra_msi(chip);
-	struct irq_data *d = irq_get_irq_data(irq);
-	irq_hw_number_t hwirq = irqd_to_hwirq(d);
+	struct tegra_msi *msi = irq_data_get_irq_chip_data(d);
+	struct tegra_pcie *pcie = msi_to_pcie(msi);
+	unsigned int index = d->hwirq / 32;
+	unsigned long flags;
+	u32 value;
 
-	irq_dispose_mapping(irq);
-	tegra_msi_free(msi, hwirq);
+	spin_lock_irqsave(&msi->mask_lock, flags);
+	value = afi_readl(pcie, AFI_MSI_EN_VEC(index));
+	value |= BIT(d->hwirq % 32);
+	afi_writel(pcie, value, AFI_MSI_EN_VEC(index));
+	spin_unlock_irqrestore(&msi->mask_lock, flags);
 }
 
-static struct irq_chip tegra_msi_irq_chip = {
-	.name = "Tegra PCIe MSI",
-	.irq_enable = pci_msi_unmask_irq,
-	.irq_disable = pci_msi_mask_irq,
-	.irq_mask = pci_msi_mask_irq,
-	.irq_unmask = pci_msi_unmask_irq,
+static int tegra_msi_set_affinity(struct irq_data *d, const struct cpumask *mask, bool force)
+{
+	return -EINVAL;
+}
+
+static void tegra_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
+{
+	struct tegra_msi *msi = irq_data_get_irq_chip_data(data);
+
+	msg->address_lo = lower_32_bits(msi->phys);
+	msg->address_hi = upper_32_bits(msi->phys);
+	msg->data = data->hwirq;
+}
+
+static struct irq_chip tegra_msi_bottom_chip = {
+	.name			= "Tegra MSI",
+	.irq_ack		= tegra_msi_irq_ack,
+	.irq_mask		= tegra_msi_irq_mask,
+	.irq_unmask		= tegra_msi_irq_unmask,
+	.irq_set_affinity 	= tegra_msi_set_affinity,
+	.irq_compose_msi_msg	= tegra_compose_msi_msg,
 };
 
-static int tegra_msi_map(struct irq_domain *domain, unsigned int irq,
-			 irq_hw_number_t hwirq)
+static int tegra_msi_domain_alloc(struct irq_domain *domain, unsigned int virq,
+				  unsigned int nr_irqs, void *args)
 {
-	irq_set_chip_and_handler(irq, &tegra_msi_irq_chip, handle_simple_irq);
-	irq_set_chip_data(irq, domain->host_data);
+	struct tegra_msi *msi = domain->host_data;
+	unsigned int i;
+	int hwirq;
+
+	mutex_lock(&msi->map_lock);
+
+	hwirq = bitmap_find_free_region(msi->used, INT_PCI_MSI_NR, order_base_2(nr_irqs));
+
+	mutex_unlock(&msi->map_lock);
+
+	if (hwirq < 0)
+		return -ENOSPC;
+
+	for (i = 0; i < nr_irqs; i++)
+		irq_domain_set_info(domain, virq + i, hwirq + i,
+				    &tegra_msi_bottom_chip, domain->host_data,
+				    handle_edge_irq, NULL, NULL);
 
 	tegra_cpuidle_pcie_irqs_in_use();
 
 	return 0;
 }
 
-static const struct irq_domain_ops msi_domain_ops = {
-	.map = tegra_msi_map,
+static void tegra_msi_domain_free(struct irq_domain *domain, unsigned int virq,
+				  unsigned int nr_irqs)
+{
+	struct irq_data *d = irq_domain_get_irq_data(domain, virq);
+	struct tegra_msi *msi = domain->host_data;
+
+	mutex_lock(&msi->map_lock);
+
+	bitmap_release_region(msi->used, d->hwirq, order_base_2(nr_irqs));
+
+	mutex_unlock(&msi->map_lock);
+}
+
+static const struct irq_domain_ops tegra_msi_domain_ops = {
+	.alloc = tegra_msi_domain_alloc,
+	.free = tegra_msi_domain_free,
+};
+
+static struct msi_domain_info tegra_msi_info = {
+	.flags	= (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
+		   MSI_FLAG_PCI_MSIX),
+	.chip	= &tegra_msi_top_chip,
 };
 
+static int tegra_allocate_domains(struct tegra_msi *msi)
+{
+	struct tegra_pcie *pcie = msi_to_pcie(msi);
+	struct fwnode_handle *fwnode = dev_fwnode(pcie->dev);
+	struct irq_domain *parent;
+
+	parent = irq_domain_create_linear(fwnode, INT_PCI_MSI_NR,
+					  &tegra_msi_domain_ops, msi);
+	if (!parent) {
+		dev_err(pcie->dev, "failed to create IRQ domain\n");
+		return -ENOMEM;
+	}
+	irq_domain_update_bus_token(parent, DOMAIN_BUS_NEXUS);
+
+	msi->domain = pci_msi_create_irq_domain(fwnode, &tegra_msi_info, parent);
+	if (!msi->domain) {
+		dev_err(pcie->dev, "failed to create MSI domain\n");
+		irq_domain_remove(parent);
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+
+static void tegra_free_domains(struct tegra_msi *msi)
+{
+	struct irq_domain *parent = msi->domain->parent;
+
+	irq_domain_remove(msi->domain);
+	irq_domain_remove(parent);
+}
+
 static int tegra_pcie_msi_setup(struct tegra_pcie *pcie)
 {
-	struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);
 	struct platform_device *pdev = to_platform_device(pcie->dev);
 	struct tegra_msi *msi = &pcie->msi;
 	struct device *dev = pcie->dev;
 	int err;
 
-	mutex_init(&msi->lock);
-
-	msi->chip.dev = dev;
-	msi->chip.setup_irq = tegra_msi_setup_irq;
-	msi->chip.teardown_irq = tegra_msi_teardown_irq;
+	mutex_init(&msi->map_lock);
+	spin_lock_init(&msi->mask_lock);
 
-	msi->domain = irq_domain_add_linear(dev->of_node, INT_PCI_MSI_NR,
-					    &msi_domain_ops, &msi->chip);
-	if (!msi->domain) {
-		dev_err(dev, "failed to create IRQ domain\n");
-		return -ENOMEM;
+	if (IS_ENABLED(CONFIG_PCI_MSI)) {
+		err = tegra_allocate_domains(msi);
+		if (err)
+			return err;
 	}
 
 	err = platform_get_irq_byname(pdev, "msi");
@@ -1714,12 +1766,7 @@ static int tegra_pcie_msi_setup(struct tegra_pcie *pcie)
 
 	msi->irq = err;
 
-	err = request_irq(msi->irq, tegra_pcie_msi_irq, IRQF_NO_THREAD,
-			  tegra_msi_irq_chip.name, pcie);
-	if (err < 0) {
-		dev_err(dev, "failed to request IRQ: %d\n", err);
-		goto free_irq_domain;
-	}
+	irq_set_chained_handler_and_data(msi->irq, tegra_pcie_msi_irq, pcie);
 
 	/* Though the PCIe controller can address >32-bit address space, to
 	 * facilitate endpoints that support only 32-bit MSI target address,
@@ -1740,14 +1787,14 @@ static int tegra_pcie_msi_setup(struct tegra_pcie *pcie)
 		goto free_irq;
 	}
 
-	host->msi = &msi->chip;
-
 	return 0;
 
 free_irq:
-	free_irq(msi->irq, pcie);
+	irq_set_chained_handler_and_data(msi->irq, NULL, NULL);
 free_irq_domain:
-	irq_domain_remove(msi->domain);
+	if (IS_ENABLED(CONFIG_PCI_MSI))
+		tegra_free_domains(msi);
+
 	return err;
 }
 
@@ -1755,22 +1802,18 @@ static void tegra_pcie_enable_msi(struct tegra_pcie *pcie)
 {
 	const struct tegra_pcie_soc *soc = pcie->soc;
 	struct tegra_msi *msi = &pcie->msi;
-	u32 reg;
+	u32 reg, msi_state[INT_PCI_MSI_NR / 32];
+	int i;
 
 	afi_writel(pcie, msi->phys >> soc->msi_base_shift, AFI_MSI_FPCI_BAR_ST);
 	afi_writel(pcie, msi->phys, AFI_MSI_AXI_BAR_ST);
 	/* this register is in 4K increments */
 	afi_writel(pcie, 1, AFI_MSI_BAR_SZ);
 
-	/* enable all MSI vectors */
-	afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC0);
-	afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC1);
-	afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC2);
-	afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC3);
-	afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC4);
-	afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC5);
-	afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC6);
-	afi_writel(pcie, 0xffffffff, AFI_MSI_EN_VEC7);
+	/* Restore the MSI allocation state */
+	bitmap_to_arr32(msi_state, msi->used, INT_PCI_MSI_NR);
+	for (i = 0; i < ARRAY_SIZE(msi_state); i++)
+		afi_writel(pcie, msi_state[i], AFI_MSI_EN_VEC(i));
 
 	/* and unmask the MSI interrupt */
 	reg = afi_readl(pcie, AFI_INTR_MASK);
@@ -1786,16 +1829,16 @@ static void tegra_pcie_msi_teardown(struct tegra_pcie *pcie)
 	dma_free_attrs(pcie->dev, PAGE_SIZE, msi->virt, msi->phys,
 		       DMA_ATTR_NO_KERNEL_MAPPING);
 
-	if (msi->irq > 0)
-		free_irq(msi->irq, pcie);
-
 	for (i = 0; i < INT_PCI_MSI_NR; i++) {
 		irq = irq_find_mapping(msi->domain, i);
 		if (irq > 0)
-			irq_dispose_mapping(irq);
+			irq_domain_free_irqs(irq, 1);
 	}
 
-	irq_domain_remove(msi->domain);
+	irq_set_chained_handler_and_data(msi->irq, NULL, NULL);
+
+	if (IS_ENABLED(CONFIG_PCI_MSI))
+		tegra_free_domains(msi);
 }
 
 static int tegra_pcie_disable_msi(struct tegra_pcie *pcie)
@@ -1807,16 +1850,6 @@ static int tegra_pcie_disable_msi(struct tegra_pcie *pcie)
 	value &= ~AFI_INTR_MASK_MSI_MASK;
 	afi_writel(pcie, value, AFI_INTR_MASK);
 
-	/* disable all MSI vectors */
-	afi_writel(pcie, 0, AFI_MSI_EN_VEC0);
-	afi_writel(pcie, 0, AFI_MSI_EN_VEC1);
-	afi_writel(pcie, 0, AFI_MSI_EN_VEC2);
-	afi_writel(pcie, 0, AFI_MSI_EN_VEC3);
-	afi_writel(pcie, 0, AFI_MSI_EN_VEC4);
-	afi_writel(pcie, 0, AFI_MSI_EN_VEC5);
-	afi_writel(pcie, 0, AFI_MSI_EN_VEC6);
-	afi_writel(pcie, 0, AFI_MSI_EN_VEC7);
-
 	return 0;
 }
 
diff --git a/drivers/pci/controller/pcie-mediatek.c b/drivers/pci/controller/pcie-mediatek.c
index ddbd2f8b3226..62a042e75d9a 100644
--- a/drivers/pci/controller/pcie-mediatek.c
+++ b/drivers/pci/controller/pcie-mediatek.c
@@ -143,6 +143,7 @@ struct mtk_pcie_port;
  * struct mtk_pcie_soc - differentiate between host generations
  * @need_fix_class_id: whether this host's class ID needed to be fixed or not
  * @need_fix_device_id: whether this host's device ID needed to be fixed or not
+ * @no_msi: Bridge has no MSI support, and relies on an external block
  * @device_id: device ID which this host need to be fixed
  * @ops: pointer to configuration access functions
  * @startup: pointer to controller setting functions
@@ -151,6 +152,7 @@ struct mtk_pcie_port;
 struct mtk_pcie_soc {
 	bool need_fix_class_id;
 	bool need_fix_device_id;
+	bool no_msi;
 	unsigned int device_id;
 	struct pci_ops *ops;
 	int (*startup)(struct mtk_pcie_port *port);
@@ -1087,6 +1089,7 @@ static int mtk_pcie_probe(struct platform_device *pdev)
 
 	host->ops = pcie->soc->ops;
 	host->sysdata = pcie;
+	host->msi_domain = pcie->soc->no_msi;
 
 	err = pci_host_probe(host);
 	if (err)
@@ -1176,6 +1179,7 @@ static const struct dev_pm_ops mtk_pcie_pm_ops = {
 };
 
 static const struct mtk_pcie_soc mtk_pcie_soc_v1 = {
+	.no_msi = true,
 	.ops = &mtk_pcie_ops,
 	.startup = mtk_pcie_startup_port,
 };
diff --git a/drivers/pci/controller/pcie-rcar-host.c b/drivers/pci/controller/pcie-rcar-host.c
index a728e8f9ad3c..765cf2b45e24 100644
--- a/drivers/pci/controller/pcie-rcar-host.c
+++ b/drivers/pci/controller/pcie-rcar-host.c
@@ -35,18 +35,12 @@
 struct rcar_msi {
 	DECLARE_BITMAP(used, INT_PCI_MSI_NR);
 	struct irq_domain *domain;
-	struct msi_controller chip;
-	unsigned long pages;
-	struct mutex lock;
+	struct mutex map_lock;
+	spinlock_t mask_lock;
 	int irq1;
 	int irq2;
 };
 
-static inline struct rcar_msi *to_rcar_msi(struct msi_controller *chip)
-{
-	return container_of(chip, struct rcar_msi, chip);
-}
-
 /* Structure representing the PCIe interface */
 struct rcar_pcie_host {
 	struct rcar_pcie	pcie;
@@ -56,6 +50,11 @@ struct rcar_pcie_host {
 	int			(*phy_init_fn)(struct rcar_pcie_host *host);
 };
 
+static struct rcar_pcie_host *msi_to_host(struct rcar_msi *msi)
+{
+	return container_of(msi, struct rcar_pcie_host, msi);
+}
+
 static u32 rcar_read_conf(struct rcar_pcie *pcie, int where)
 {
 	unsigned int shift = BITS_PER_BYTE * (where & 3);
@@ -292,8 +291,6 @@ static int rcar_pcie_enable(struct rcar_pcie_host *host)
 
 	bridge->sysdata = host;
 	bridge->ops = &rcar_pcie_ops;
-	if (IS_ENABLED(CONFIG_PCI_MSI))
-		bridge->msi = &host->msi.chip;
 
 	return pci_host_probe(bridge);
 }
@@ -473,42 +470,6 @@ static int rcar_pcie_phy_init_gen3(struct rcar_pcie_host *host)
 	return err;
 }
 
-static int rcar_msi_alloc(struct rcar_msi *chip)
-{
-	int msi;
-
-	mutex_lock(&chip->lock);
-
-	msi = find_first_zero_bit(chip->used, INT_PCI_MSI_NR);
-	if (msi < INT_PCI_MSI_NR)
-		set_bit(msi, chip->used);
-	else
-		msi = -ENOSPC;
-
-	mutex_unlock(&chip->lock);
-
-	return msi;
-}
-
-static int rcar_msi_alloc_region(struct rcar_msi *chip, int no_irqs)
-{
-	int msi;
-
-	mutex_lock(&chip->lock);
-	msi = bitmap_find_free_region(chip->used, INT_PCI_MSI_NR,
-				      order_base_2(no_irqs));
-	mutex_unlock(&chip->lock);
-
-	return msi;
-}
-
-static void rcar_msi_free(struct rcar_msi *chip, unsigned long irq)
-{
-	mutex_lock(&chip->lock);
-	clear_bit(irq, chip->used);
-	mutex_unlock(&chip->lock);
-}
-
 static irqreturn_t rcar_pcie_msi_irq(int irq, void *data)
 {
 	struct rcar_pcie_host *host = data;
@@ -527,18 +488,13 @@ static irqreturn_t rcar_pcie_msi_irq(int irq, void *data)
 		unsigned int index = find_first_bit(&reg, 32);
 		unsigned int msi_irq;
 
-		/* clear the interrupt */
-		rcar_pci_write_reg(pcie, 1 << index, PCIEMSIFR);
-
-		msi_irq = irq_find_mapping(msi->domain, index);
+		msi_irq = irq_find_mapping(msi->domain->parent, index);
 		if (msi_irq) {
-			if (test_bit(index, msi->used))
-				generic_handle_irq(msi_irq);
-			else
-				dev_info(dev, "unhandled MSI\n");
+			generic_handle_irq(msi_irq);
 		} else {
 			/* Unknown MSI, just clear it */
 			dev_dbg(dev, "unexpected MSI\n");
+			rcar_pci_write_reg(pcie, BIT(index), PCIEMSIFR);
 		}
 
 		/* see if there's any more pending in this vector */
@@ -548,149 +504,169 @@ static irqreturn_t rcar_pcie_msi_irq(int irq, void *data)
 	return IRQ_HANDLED;
 }
 
-static int rcar_msi_setup_irq(struct msi_controller *chip, struct pci_dev *pdev,
-			      struct msi_desc *desc)
+static void rcar_msi_top_irq_ack(struct irq_data *d)
 {
-	struct rcar_msi *msi = to_rcar_msi(chip);
-	struct rcar_pcie_host *host = container_of(chip, struct rcar_pcie_host,
-						   msi.chip);
-	struct rcar_pcie *pcie = &host->pcie;
-	struct msi_msg msg;
-	unsigned int irq;
-	int hwirq;
+	irq_chip_ack_parent(d);
+}
 
-	hwirq = rcar_msi_alloc(msi);
-	if (hwirq < 0)
-		return hwirq;
+static void rcar_msi_top_irq_mask(struct irq_data *d)
+{
+	pci_msi_mask_irq(d);
+	irq_chip_mask_parent(d);
+}
 
-	irq = irq_find_mapping(msi->domain, hwirq);
-	if (!irq) {
-		rcar_msi_free(msi, hwirq);
-		return -EINVAL;
-	}
+static void rcar_msi_top_irq_unmask(struct irq_data *d)
+{
+	pci_msi_unmask_irq(d);
+	irq_chip_unmask_parent(d);
+}
 
-	irq_set_msi_desc(irq, desc);
+static struct irq_chip rcar_msi_top_chip = {
+	.name		= "PCIe MSI",
+	.irq_ack	= rcar_msi_top_irq_ack,
+	.irq_mask	= rcar_msi_top_irq_mask,
+	.irq_unmask	= rcar_msi_top_irq_unmask,
+};
 
-	msg.address_lo = rcar_pci_read_reg(pcie, PCIEMSIALR) & ~MSIFE;
-	msg.address_hi = rcar_pci_read_reg(pcie, PCIEMSIAUR);
-	msg.data = hwirq;
+static void rcar_msi_irq_ack(struct irq_data *d)
+{
+	struct rcar_msi *msi = irq_data_get_irq_chip_data(d);
+	struct rcar_pcie *pcie = &msi_to_host(msi)->pcie;
 
-	pci_write_msi_msg(irq, &msg);
+	/* clear the interrupt */
+	rcar_pci_write_reg(pcie, BIT(d->hwirq), PCIEMSIFR);
+}
 
-	return 0;
+static void rcar_msi_irq_mask(struct irq_data *d)
+{
+	struct rcar_msi *msi = irq_data_get_irq_chip_data(d);
+	struct rcar_pcie *pcie = &msi_to_host(msi)->pcie;
+	unsigned long flags;
+	u32 value;
+
+	spin_lock_irqsave(&msi->mask_lock, flags);
+	value = rcar_pci_read_reg(pcie, PCIEMSIIER);
+	value &= ~BIT(d->hwirq);
+	rcar_pci_write_reg(pcie, value, PCIEMSIIER);
+	spin_unlock_irqrestore(&msi->mask_lock, flags);
 }
 
-static int rcar_msi_setup_irqs(struct msi_controller *chip,
-			       struct pci_dev *pdev, int nvec, int type)
+static void rcar_msi_irq_unmask(struct irq_data *d)
 {
-	struct rcar_msi *msi = to_rcar_msi(chip);
-	struct rcar_pcie_host *host = container_of(chip, struct rcar_pcie_host,
-						   msi.chip);
-	struct rcar_pcie *pcie = &host->pcie;
-	struct msi_desc *desc;
-	struct msi_msg msg;
-	unsigned int irq;
-	int hwirq;
-	int i;
+	struct rcar_msi *msi = irq_data_get_irq_chip_data(d);
+	struct rcar_pcie *pcie = &msi_to_host(msi)->pcie;
+	unsigned long flags;
+	u32 value;
+
+	spin_lock_irqsave(&msi->mask_lock, flags);
+	value = rcar_pci_read_reg(pcie, PCIEMSIIER);
+	value |= BIT(d->hwirq);
+	rcar_pci_write_reg(pcie, value, PCIEMSIIER);
+	spin_unlock_irqrestore(&msi->mask_lock, flags);
+}
 
-	/* MSI-X interrupts are not supported */
-	if (type == PCI_CAP_ID_MSIX)
-		return -EINVAL;
+static int rcar_msi_set_affinity(struct irq_data *d, const struct cpumask *mask, bool force)
+{
+	return -EINVAL;
+}
 
-	WARN_ON(!list_is_singular(&pdev->dev.msi_list));
-	desc = list_entry(pdev->dev.msi_list.next, struct msi_desc, list);
+static void rcar_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
+{
+	struct rcar_msi *msi = irq_data_get_irq_chip_data(data);
+	struct rcar_pcie *pcie = &msi_to_host(msi)->pcie;
 
-	hwirq = rcar_msi_alloc_region(msi, nvec);
-	if (hwirq < 0)
-		return -ENOSPC;
+	msg->address_lo = rcar_pci_read_reg(pcie, PCIEMSIALR) & ~MSIFE;
+	msg->address_hi = rcar_pci_read_reg(pcie, PCIEMSIAUR);
+	msg->data = data->hwirq;
+}
 
-	irq = irq_find_mapping(msi->domain, hwirq);
-	if (!irq)
-		return -ENOSPC;
+static struct irq_chip rcar_msi_bottom_chip = {
+	.name			= "Rcar MSI",
+	.irq_ack		= rcar_msi_irq_ack,
+	.irq_mask		= rcar_msi_irq_mask,
+	.irq_unmask		= rcar_msi_irq_unmask,
+	.irq_set_affinity 	= rcar_msi_set_affinity,
+	.irq_compose_msi_msg	= rcar_compose_msi_msg,
+};
 
-	for (i = 0; i < nvec; i++) {
-		/*
-		 * irq_create_mapping() called from rcar_pcie_probe() pre-
-		 * allocates descs,  so there is no need to allocate descs here.
-		 * We can therefore assume that if irq_find_mapping() above
-		 * returns non-zero, then the descs are also successfully
-		 * allocated.
-		 */
-		if (irq_set_msi_desc_off(irq, i, desc)) {
-			/* TODO: clear */
-			return -EINVAL;
-		}
-	}
+static int rcar_msi_domain_alloc(struct irq_domain *domain, unsigned int virq,
+				  unsigned int nr_irqs, void *args)
+{
+	struct rcar_msi *msi = domain->host_data;
+	unsigned int i;
+	int hwirq;
 
-	desc->nvec_used = nvec;
-	desc->msi_attrib.multiple = order_base_2(nvec);
+	mutex_lock(&msi->map_lock);
 
-	msg.address_lo = rcar_pci_read_reg(pcie, PCIEMSIALR) & ~MSIFE;
-	msg.address_hi = rcar_pci_read_reg(pcie, PCIEMSIAUR);
-	msg.data = hwirq;
+	hwirq = bitmap_find_free_region(msi->used, INT_PCI_MSI_NR, order_base_2(nr_irqs));
 
-	pci_write_msi_msg(irq, &msg);
+	mutex_unlock(&msi->map_lock);
+
+	if (hwirq < 0)
+		return -ENOSPC;
+
+	for (i = 0; i < nr_irqs; i++)
+		irq_domain_set_info(domain, virq + i, hwirq + i,
+				    &rcar_msi_bottom_chip, domain->host_data,
+				    handle_edge_irq, NULL, NULL);
 
 	return 0;
 }
 
-static void rcar_msi_teardown_irq(struct msi_controller *chip, unsigned int irq)
+static void rcar_msi_domain_free(struct irq_domain *domain, unsigned int virq,
+				  unsigned int nr_irqs)
 {
-	struct rcar_msi *msi = to_rcar_msi(chip);
-	struct irq_data *d = irq_get_irq_data(irq);
-
-	rcar_msi_free(msi, d->hwirq);
-}
+	struct irq_data *d = irq_domain_get_irq_data(domain, virq);
+	struct rcar_msi *msi = domain->host_data;
 
-static struct irq_chip rcar_msi_irq_chip = {
-	.name = "R-Car PCIe MSI",
-	.irq_enable = pci_msi_unmask_irq,
-	.irq_disable = pci_msi_mask_irq,
-	.irq_mask = pci_msi_mask_irq,
-	.irq_unmask = pci_msi_unmask_irq,
-};
+	mutex_lock(&msi->map_lock);
 
-static int rcar_msi_map(struct irq_domain *domain, unsigned int irq,
-			irq_hw_number_t hwirq)
-{
-	irq_set_chip_and_handler(irq, &rcar_msi_irq_chip, handle_simple_irq);
-	irq_set_chip_data(irq, domain->host_data);
+	bitmap_release_region(msi->used, d->hwirq, order_base_2(nr_irqs));
 
-	return 0;
+	mutex_unlock(&msi->map_lock);
 }
 
-static const struct irq_domain_ops msi_domain_ops = {
-	.map = rcar_msi_map,
+static const struct irq_domain_ops rcar_msi_domain_ops = {
+	.alloc	= rcar_msi_domain_alloc,
+	.free	= rcar_msi_domain_free,
+};
+
+static struct msi_domain_info rcar_msi_info = {
+	.flags	= (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
+		   MSI_FLAG_MULTI_PCI_MSI),
+	.chip	= &rcar_msi_top_chip,
 };
 
-static void rcar_pcie_unmap_msi(struct rcar_pcie_host *host)
+static int rcar_allocate_domains(struct rcar_msi *msi)
 {
-	struct rcar_msi *msi = &host->msi;
-	int i, irq;
+	struct rcar_pcie *pcie = &msi_to_host(msi)->pcie;
+	struct fwnode_handle *fwnode = dev_fwnode(pcie->dev);
+	struct irq_domain *parent;
+
+	parent = irq_domain_create_linear(fwnode, INT_PCI_MSI_NR,
+					  &rcar_msi_domain_ops, msi);
+	if (!parent) {
+		dev_err(pcie->dev, "failed to create IRQ domain\n");
+		return -ENOMEM;
+	}
+	irq_domain_update_bus_token(parent, DOMAIN_BUS_NEXUS);
 
-	for (i = 0; i < INT_PCI_MSI_NR; i++) {
-		irq = irq_find_mapping(msi->domain, i);
-		if (irq > 0)
-			irq_dispose_mapping(irq);
+	msi->domain = pci_msi_create_irq_domain(fwnode, &rcar_msi_info, parent);
+	if (!msi->domain) {
+		dev_err(pcie->dev, "failed to create MSI domain\n");
+		irq_domain_remove(parent);
+		return -ENOMEM;
 	}
 
-	irq_domain_remove(msi->domain);
+	return 0;
 }
 
-static void rcar_pcie_hw_enable_msi(struct rcar_pcie_host *host)
+static void rcar_free_domains(struct rcar_msi *msi)
 {
-	struct rcar_pcie *pcie = &host->pcie;
-	struct rcar_msi *msi = &host->msi;
-	unsigned long base;
-
-	/* setup MSI data target */
-	base = virt_to_phys((void *)msi->pages);
+	struct irq_domain *parent = msi->domain->parent;
 
-	rcar_pci_write_reg(pcie, lower_32_bits(base) | MSIFE, PCIEMSIALR);
-	rcar_pci_write_reg(pcie, upper_32_bits(base), PCIEMSIAUR);
-
-	/* enable all MSI interrupts */
-	rcar_pci_write_reg(pcie, 0xffffffff, PCIEMSIIER);
+	irq_domain_remove(msi->domain);
+	irq_domain_remove(parent);
 }
 
 static int rcar_pcie_enable_msi(struct rcar_pcie_host *host)
@@ -698,29 +674,24 @@ static int rcar_pcie_enable_msi(struct rcar_pcie_host *host)
 	struct rcar_pcie *pcie = &host->pcie;
 	struct device *dev = pcie->dev;
 	struct rcar_msi *msi = &host->msi;
-	int err, i;
-
-	mutex_init(&msi->lock);
+	struct resource res;
+	int err;
 
-	msi->chip.dev = dev;
-	msi->chip.setup_irq = rcar_msi_setup_irq;
-	msi->chip.setup_irqs = rcar_msi_setup_irqs;
-	msi->chip.teardown_irq = rcar_msi_teardown_irq;
+	mutex_init(&msi->map_lock);
+	spin_lock_init(&msi->mask_lock);
 
-	msi->domain = irq_domain_add_linear(dev->of_node, INT_PCI_MSI_NR,
-					    &msi_domain_ops, &msi->chip);
-	if (!msi->domain) {
-		dev_err(dev, "failed to create IRQ domain\n");
-		return -ENOMEM;
-	}
+	err = of_address_to_resource(dev->of_node, 0, &res);
+	if (err)
+		return err;
 
-	for (i = 0; i < INT_PCI_MSI_NR; i++)
-		irq_create_mapping(msi->domain, i);
+	err = rcar_allocate_domains(msi);
+	if (err)
+		return err;
 
 	/* Two irqs are for MSI, but they are also used for non-MSI irqs */
 	err = devm_request_irq(dev, msi->irq1, rcar_pcie_msi_irq,
 			       IRQF_SHARED | IRQF_NO_THREAD,
-			       rcar_msi_irq_chip.name, host);
+			       rcar_msi_bottom_chip.name, host);
 	if (err < 0) {
 		dev_err(dev, "failed to request IRQ: %d\n", err);
 		goto err;
@@ -728,27 +699,32 @@ static int rcar_pcie_enable_msi(struct rcar_pcie_host *host)
 
 	err = devm_request_irq(dev, msi->irq2, rcar_pcie_msi_irq,
 			       IRQF_SHARED | IRQF_NO_THREAD,
-			       rcar_msi_irq_chip.name, host);
+			       rcar_msi_bottom_chip.name, host);
 	if (err < 0) {
 		dev_err(dev, "failed to request IRQ: %d\n", err);
 		goto err;
 	}
 
-	/* setup MSI data target */
-	msi->pages = __get_free_pages(GFP_KERNEL | GFP_DMA32, 0);
-	rcar_pcie_hw_enable_msi(host);
+	/* disable all MSIs */
+	rcar_pci_write_reg(pcie, 0, PCIEMSIIER);
+
+	/*
+	 * Setup MSI data target using RC base address address, which
+	 * is guaranteed to be in the low 32bit range on any RCar HW.
+	 */
+	rcar_pci_write_reg(pcie, lower_32_bits(res.start) | MSIFE, PCIEMSIALR);
+	rcar_pci_write_reg(pcie, upper_32_bits(res.start), PCIEMSIAUR);
 
 	return 0;
 
 err:
-	rcar_pcie_unmap_msi(host);
+	rcar_free_domains(msi);
 	return err;
 }
 
 static void rcar_pcie_teardown_msi(struct rcar_pcie_host *host)
 {
 	struct rcar_pcie *pcie = &host->pcie;
-	struct rcar_msi *msi = &host->msi;
 
 	/* Disable all MSI interrupts */
 	rcar_pci_write_reg(pcie, 0, PCIEMSIIER);
@@ -756,9 +732,7 @@ static void rcar_pcie_teardown_msi(struct rcar_pcie_host *host)
 	/* Disable address decoding of the MSI interrupt, MSIFE */
 	rcar_pci_write_reg(pcie, 0, PCIEMSIALR);
 
-	free_pages(msi->pages, 0);
-
-	rcar_pcie_unmap_msi(host);
+	rcar_free_domains(&host->msi);
 }
 
 static int rcar_pcie_get_resources(struct rcar_pcie_host *host)
@@ -1011,8 +985,17 @@ static int __maybe_unused rcar_pcie_resume(struct device *dev)
 	dev_info(dev, "PCIe x%d: link up\n", (data >> 20) & 0x3f);
 
 	/* Enable MSI */
-	if (IS_ENABLED(CONFIG_PCI_MSI))
-		rcar_pcie_hw_enable_msi(host);
+	if (IS_ENABLED(CONFIG_PCI_MSI)) {
+		struct resource res;
+		u32 val;
+
+		of_address_to_resource(dev->of_node, 0, &res);
+		rcar_pci_write_reg(pcie, upper_32_bits(res.start), PCIEMSIAUR);
+		rcar_pci_write_reg(pcie, lower_32_bits(res.start) | MSIFE, PCIEMSIALR);
+
+		bitmap_to_arr32(&val, host->msi.used, INT_PCI_MSI_NR);
+		rcar_pci_write_reg(pcie, val, PCIEMSIIER);
+	}
 
 	rcar_pcie_hw_enable(host);
 
diff --git a/drivers/pci/controller/pcie-xilinx.c b/drivers/pci/controller/pcie-xilinx.c
index fa5baeb82653..14001febf59a 100644
--- a/drivers/pci/controller/pcie-xilinx.c
+++ b/drivers/pci/controller/pcie-xilinx.c
@@ -93,25 +93,23 @@
 /**
  * struct xilinx_pcie_port - PCIe port information
  * @reg_base: IO Mapped Register Base
- * @irq: Interrupt number
- * @msi_pages: MSI pages
  * @dev: Device pointer
+ * @msi_map: Bitmap of allocated MSIs
+ * @map_lock: Mutex protecting the MSI allocation
  * @msi_domain: MSI IRQ domain pointer
  * @leg_domain: Legacy IRQ domain pointer
  * @resources: Bus Resources
  */
 struct xilinx_pcie_port {
 	void __iomem *reg_base;
-	u32 irq;
-	unsigned long msi_pages;
 	struct device *dev;
+	unsigned long msi_map[BITS_TO_LONGS(XILINX_NUM_MSI_IRQS)];
+	struct mutex map_lock;
 	struct irq_domain *msi_domain;
 	struct irq_domain *leg_domain;
 	struct list_head resources;
 };
 
-static DECLARE_BITMAP(msi_irq_in_use, XILINX_NUM_MSI_IRQS);
-
 static inline u32 pcie_read(struct xilinx_pcie_port *port, u32 reg)
 {
 	return readl(port->reg_base + reg);
@@ -196,151 +194,118 @@ static struct pci_ops xilinx_pcie_ops = {
 
 /* MSI functions */
 
-/**
- * xilinx_pcie_destroy_msi - Free MSI number
- * @irq: IRQ to be freed
- */
-static void xilinx_pcie_destroy_msi(unsigned int irq)
+static void xilinx_msi_top_irq_ack(struct irq_data *d)
 {
-	struct msi_desc *msi;
-	struct xilinx_pcie_port *port;
-	struct irq_data *d = irq_get_irq_data(irq);
-	irq_hw_number_t hwirq = irqd_to_hwirq(d);
-
-	if (!test_bit(hwirq, msi_irq_in_use)) {
-		msi = irq_get_msi_desc(irq);
-		port = msi_desc_to_pci_sysdata(msi);
-		dev_err(port->dev, "Trying to free unused MSI#%d\n", irq);
-	} else {
-		clear_bit(hwirq, msi_irq_in_use);
-	}
+	/*
+	 * xilinx_pcie_intr_handler() will have performed the Ack.
+	 * Eventually, this should be fixed and the Ack be moved in
+	 * the respective callbacks for INTx and MSI.
+	 */
 }
 
-/**
- * xilinx_pcie_assign_msi - Allocate MSI number
- *
- * Return: A valid IRQ on success and error value on failure.
- */
-static int xilinx_pcie_assign_msi(void)
-{
-	int pos;
-
-	pos = find_first_zero_bit(msi_irq_in_use, XILINX_NUM_MSI_IRQS);
-	if (pos < XILINX_NUM_MSI_IRQS)
-		set_bit(pos, msi_irq_in_use);
-	else
-		return -ENOSPC;
+static struct irq_chip xilinx_msi_top_chip = {
+	.name		= "PCIe MSI",
+	.irq_ack	= xilinx_msi_top_irq_ack,
+};
 
-	return pos;
+static int xilinx_msi_set_affinity(struct irq_data *d, const struct cpumask *mask, bool force)
+{
+	return -EINVAL;
 }
 
-/**
- * xilinx_msi_teardown_irq - Destroy the MSI
- * @chip: MSI Chip descriptor
- * @irq: MSI IRQ to destroy
- */
-static void xilinx_msi_teardown_irq(struct msi_controller *chip,
-				    unsigned int irq)
+static void xilinx_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
 {
-	xilinx_pcie_destroy_msi(irq);
-	irq_dispose_mapping(irq);
+	struct xilinx_pcie_port *pcie = irq_data_get_irq_chip_data(data);
+	phys_addr_t pa = ALIGN_DOWN(virt_to_phys(pcie), SZ_4K);
+
+	msg->address_lo = lower_32_bits(pa);
+	msg->address_hi = upper_32_bits(pa);
+	msg->data = data->hwirq;
 }
 
-/**
- * xilinx_pcie_msi_setup_irq - Setup MSI request
- * @chip: MSI chip pointer
- * @pdev: PCIe device pointer
- * @desc: MSI descriptor pointer
- *
- * Return: '0' on success and error value on failure
- */
-static int xilinx_pcie_msi_setup_irq(struct msi_controller *chip,
-				     struct pci_dev *pdev,
-				     struct msi_desc *desc)
-{
-	struct xilinx_pcie_port *port = pdev->bus->sysdata;
-	unsigned int irq;
-	int hwirq;
-	struct msi_msg msg;
-	phys_addr_t msg_addr;
+static struct irq_chip xilinx_msi_bottom_chip = {
+	.name			= "Xilinx MSI",
+	.irq_set_affinity 	= xilinx_msi_set_affinity,
+	.irq_compose_msi_msg	= xilinx_compose_msi_msg,
+};
 
-	hwirq = xilinx_pcie_assign_msi();
-	if (hwirq < 0)
-		return hwirq;
+static int xilinx_msi_domain_alloc(struct irq_domain *domain, unsigned int virq,
+				  unsigned int nr_irqs, void *args)
+{
+	struct xilinx_pcie_port *port = domain->host_data;
+	int hwirq, i;
 
-	irq = irq_create_mapping(port->msi_domain, hwirq);
-	if (!irq)
-		return -EINVAL;
+	mutex_lock(&port->map_lock);
 
-	irq_set_msi_desc(irq, desc);
+	hwirq = bitmap_find_free_region(port->msi_map, XILINX_NUM_MSI_IRQS, order_base_2(nr_irqs));
 
-	msg_addr = virt_to_phys((void *)port->msi_pages);
+	mutex_unlock(&port->map_lock);
 
-	msg.address_hi = 0;
-	msg.address_lo = msg_addr;
-	msg.data = irq;
+	if (hwirq < 0)
+		return -ENOSPC;
 
-	pci_write_msi_msg(irq, &msg);
+	for (i = 0; i < nr_irqs; i++)
+		irq_domain_set_info(domain, virq + i, hwirq + i,
+				    &xilinx_msi_bottom_chip, domain->host_data,
+				    handle_edge_irq, NULL, NULL);
 
 	return 0;
 }
 
-/* MSI Chip Descriptor */
-static struct msi_controller xilinx_pcie_msi_chip = {
-	.setup_irq = xilinx_pcie_msi_setup_irq,
-	.teardown_irq = xilinx_msi_teardown_irq,
-};
+static void xilinx_msi_domain_free(struct irq_domain *domain, unsigned int virq,
+				  unsigned int nr_irqs)
+{
+	struct irq_data *d = irq_domain_get_irq_data(domain, virq);
+	struct xilinx_pcie_port *port = domain->host_data;
 
-/* HW Interrupt Chip Descriptor */
-static struct irq_chip xilinx_msi_irq_chip = {
-	.name = "Xilinx PCIe MSI",
-	.irq_enable = pci_msi_unmask_irq,
-	.irq_disable = pci_msi_mask_irq,
-	.irq_mask = pci_msi_mask_irq,
-	.irq_unmask = pci_msi_unmask_irq,
-};
+	mutex_lock(&port->map_lock);
 
-/**
- * xilinx_pcie_msi_map - Set the handler for the MSI and mark IRQ as valid
- * @domain: IRQ domain
- * @irq: Virtual IRQ number
- * @hwirq: HW interrupt number
- *
- * Return: Always returns 0.
- */
-static int xilinx_pcie_msi_map(struct irq_domain *domain, unsigned int irq,
-			       irq_hw_number_t hwirq)
-{
-	irq_set_chip_and_handler(irq, &xilinx_msi_irq_chip, handle_simple_irq);
-	irq_set_chip_data(irq, domain->host_data);
+	bitmap_release_region(port->msi_map, d->hwirq, order_base_2(nr_irqs));
 
-	return 0;
+	mutex_unlock(&port->map_lock);
 }
 
-/* IRQ Domain operations */
-static const struct irq_domain_ops msi_domain_ops = {
-	.map = xilinx_pcie_msi_map,
+static const struct irq_domain_ops xilinx_msi_domain_ops = {
+	.alloc	= xilinx_msi_domain_alloc,
+	.free	= xilinx_msi_domain_free,
 };
 
-/**
- * xilinx_pcie_enable_msi - Enable MSI support
- * @port: PCIe port information
- */
-static int xilinx_pcie_enable_msi(struct xilinx_pcie_port *port)
+static struct msi_domain_info xilinx_msi_info = {
+	.flags	= (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS),
+	.chip	= &xilinx_msi_top_chip,
+};
+
+static int xilinx_allocate_msi_domains(struct xilinx_pcie_port *pcie)
 {
-	phys_addr_t msg_addr;
+	struct fwnode_handle *fwnode = dev_fwnode(pcie->dev);
+	struct irq_domain *parent;
 
-	port->msi_pages = __get_free_pages(GFP_KERNEL, 0);
-	if (!port->msi_pages)
+	parent = irq_domain_create_linear(fwnode, XILINX_NUM_MSI_IRQS,
+					  &xilinx_msi_domain_ops, pcie);
+	if (!parent) {
+		dev_err(pcie->dev, "failed to create IRQ domain\n");
 		return -ENOMEM;
+	}
+	irq_domain_update_bus_token(parent, DOMAIN_BUS_NEXUS);
 
-	msg_addr = virt_to_phys((void *)port->msi_pages);
-	pcie_write(port, 0x0, XILINX_PCIE_REG_MSIBASE1);
-	pcie_write(port, msg_addr, XILINX_PCIE_REG_MSIBASE2);
+	pcie->msi_domain = pci_msi_create_irq_domain(fwnode, &xilinx_msi_info, parent);
+	if (!pcie->msi_domain) {
+		dev_err(pcie->dev, "failed to create MSI domain\n");
+		irq_domain_remove(parent);
+		return -ENOMEM;
+	}
 
 	return 0;
 }
 
+static void xilinx_free_msi_domains(struct xilinx_pcie_port *pcie)
+{
+	struct irq_domain *parent = pcie->msi_domain->parent;
+
+	irq_domain_remove(pcie->msi_domain);
+	irq_domain_remove(parent);
+}
+
 /* INTx Functions */
 
 /**
@@ -420,6 +385,8 @@ static irqreturn_t xilinx_pcie_intr_handler(int irq, void *data)
 	}
 
 	if (status & (XILINX_PCIE_INTR_INTX | XILINX_PCIE_INTR_MSI)) {
+		unsigned int irq;
+
 		val = pcie_read(port, XILINX_PCIE_REG_RPIFR1);
 
 		/* Check whether interrupt valid */
@@ -432,20 +399,19 @@ static irqreturn_t xilinx_pcie_intr_handler(int irq, void *data)
 		if (val & XILINX_PCIE_RPIFR1_MSI_INTR) {
 			val = pcie_read(port, XILINX_PCIE_REG_RPIFR2) &
 				XILINX_PCIE_RPIFR2_MSG_DATA;
+			irq = irq_find_mapping(port->msi_domain->parent, val);
 		} else {
 			val = (val & XILINX_PCIE_RPIFR1_INTR_MASK) >>
 				XILINX_PCIE_RPIFR1_INTR_SHIFT;
-			val = irq_find_mapping(port->leg_domain, val);
+			irq = irq_find_mapping(port->leg_domain, val);
 		}
 
 		/* Clear interrupt FIFO register 1 */
 		pcie_write(port, XILINX_PCIE_RPIFR1_ALL_MASK,
 			   XILINX_PCIE_REG_RPIFR1);
 
-		/* Handle the interrupt */
-		if (IS_ENABLED(CONFIG_PCI_MSI) ||
-		    !(val & XILINX_PCIE_RPIFR1_MSI_INTR))
-			generic_handle_irq(val);
+		if (irq)
+			generic_handle_irq(irq);
 	}
 
 	if (status & XILINX_PCIE_INTR_SLV_UNSUPP)
@@ -491,12 +457,11 @@ error:
 static int xilinx_pcie_init_irq_domain(struct xilinx_pcie_port *port)
 {
 	struct device *dev = port->dev;
-	struct device_node *node = dev->of_node;
 	struct device_node *pcie_intc_node;
 	int ret;
 
 	/* Setup INTx */
-	pcie_intc_node = of_get_next_child(node, NULL);
+	pcie_intc_node = of_get_next_child(dev->of_node, NULL);
 	if (!pcie_intc_node) {
 		dev_err(dev, "No PCIe Intc node found\n");
 		return -ENODEV;
@@ -513,18 +478,14 @@ static int xilinx_pcie_init_irq_domain(struct xilinx_pcie_port *port)
 
 	/* Setup MSI */
 	if (IS_ENABLED(CONFIG_PCI_MSI)) {
-		port->msi_domain = irq_domain_add_linear(node,
-							 XILINX_NUM_MSI_IRQS,
-							 &msi_domain_ops,
-							 &xilinx_pcie_msi_chip);
-		if (!port->msi_domain) {
-			dev_err(dev, "Failed to get a MSI IRQ domain\n");
-			return -ENODEV;
-		}
+		phys_addr_t pa = ALIGN_DOWN(virt_to_phys(port), SZ_4K);
 
-		ret = xilinx_pcie_enable_msi(port);
+		ret = xilinx_allocate_msi_domains(port);
 		if (ret)
 			return ret;
+
+		pcie_write(port, upper_32_bits(pa), XILINX_PCIE_REG_MSIBASE1);
+		pcie_write(port, lower_32_bits(pa), XILINX_PCIE_REG_MSIBASE2);
 	}
 
 	return 0;
@@ -572,6 +533,7 @@ static int xilinx_pcie_parse_dt(struct xilinx_pcie_port *port)
 	struct device *dev = port->dev;
 	struct device_node *node = dev->of_node;
 	struct resource regs;
+	unsigned int irq;
 	int err;
 
 	err = of_address_to_resource(node, 0, &regs);
@@ -584,12 +546,12 @@ static int xilinx_pcie_parse_dt(struct xilinx_pcie_port *port)
 	if (IS_ERR(port->reg_base))
 		return PTR_ERR(port->reg_base);
 
-	port->irq = irq_of_parse_and_map(node, 0);
-	err = devm_request_irq(dev, port->irq, xilinx_pcie_intr_handler,
+	irq = irq_of_parse_and_map(node, 0);
+	err = devm_request_irq(dev, irq, xilinx_pcie_intr_handler,
 			       IRQF_SHARED | IRQF_NO_THREAD,
 			       "xilinx-pcie", port);
 	if (err) {
-		dev_err(dev, "unable to request irq %d\n", port->irq);
+		dev_err(dev, "unable to request irq %d\n", irq);
 		return err;
 	}
 
@@ -617,7 +579,7 @@ static int xilinx_pcie_probe(struct platform_device *pdev)
 		return -ENODEV;
 
 	port = pci_host_bridge_priv(bridge);
-
+	mutex_init(&port->map_lock);
 	port->dev = dev;
 
 	err = xilinx_pcie_parse_dt(port);
@@ -637,11 +599,11 @@ static int xilinx_pcie_probe(struct platform_device *pdev)
 	bridge->sysdata = port;
 	bridge->ops = &xilinx_pcie_ops;
 
-#ifdef CONFIG_PCI_MSI
-	xilinx_pcie_msi_chip.dev = dev;
-	bridge->msi = &xilinx_pcie_msi_chip;
-#endif
-	return pci_host_probe(bridge);
+	err = pci_host_probe(bridge);
+	if (err)
+		xilinx_free_msi_domains(port);
+
+	return err;
 }
 
 static const struct of_device_id xilinx_pcie_of_match[] = {
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 3162f88fe940..217dc9f0231f 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -64,39 +64,18 @@ static void pci_msi_teardown_msi_irqs(struct pci_dev *dev)
 /* Arch hooks */
 int __weak arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
 {
-	struct msi_controller *chip = dev->bus->msi;
-	int err;
-
-	if (!chip || !chip->setup_irq)
-		return -EINVAL;
-
-	err = chip->setup_irq(chip, dev, desc);
-	if (err < 0)
-		return err;
-
-	irq_set_chip_data(desc->irq, chip);
-
-	return 0;
+	return -EINVAL;
 }
 
 void __weak arch_teardown_msi_irq(unsigned int irq)
 {
-	struct msi_controller *chip = irq_get_chip_data(irq);
-
-	if (!chip || !chip->teardown_irq)
-		return;
-
-	chip->teardown_irq(chip, irq);
 }
 
 int __weak arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
 {
-	struct msi_controller *chip = dev->bus->msi;
 	struct msi_desc *entry;
 	int ret;
 
-	if (chip && chip->setup_irqs)
-		return chip->setup_irqs(chip, dev, nvec, type);
 	/*
 	 * If an architecture wants to support multiple MSI, it needs to
 	 * override arch_setup_msi_irqs()
@@ -115,11 +94,7 @@ int __weak arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
 	return 0;
 }
 
-/*
- * We have a default implementation available as a separate non-weak
- * function, as it is used by the Xen x86 PCI code
- */
-void default_teardown_msi_irqs(struct pci_dev *dev)
+void __weak arch_teardown_msi_irqs(struct pci_dev *dev)
 {
 	int i;
 	struct msi_desc *entry;
@@ -129,11 +104,6 @@ void default_teardown_msi_irqs(struct pci_dev *dev)
 			for (i = 0; i < entry->nvec_used; i++)
 				arch_teardown_msi_irq(entry->irq + i);
 }
-
-void __weak arch_teardown_msi_irqs(struct pci_dev *dev)
-{
-	return default_teardown_msi_irqs(dev);
-}
 #endif /* CONFIG_PCI_MSI_ARCH_FALLBACKS */
 
 static void default_restore_msi_irq(struct pci_dev *dev, int irq)
@@ -901,8 +871,15 @@ static int pci_msi_supported(struct pci_dev *dev, int nvec)
 	 * Any bridge which does NOT route MSI transactions from its
 	 * secondary bus to its primary bus must set NO_MSI flag on
 	 * the secondary pci_bus.
-	 * We expect only arch-specific PCI host bus controller driver
-	 * or quirks for specific PCI bridges to be setting NO_MSI.
+	 *
+	 * The NO_MSI flag can either be set directly by:
+	 * - arch-specific PCI host bus controller drivers (deprecated)
+	 * - quirks for specific PCI bridges
+	 *
+	 * or indirectly by platform-specific PCI host bridge drivers by
+	 * advertising the 'msi_domain' property, which results in
+	 * the NO_MSI flag when no MSI domain is found for this bridge
+	 * at probe time.
 	 */
 	for (bus = dev->bus; bus; bus = bus->parent)
 		if (bus->bus_flags & PCI_BUS_FLAGS_NO_MSI)
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index be51670572fa..3a62d09b8869 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -895,7 +895,6 @@ static int pci_register_host_bridge(struct pci_host_bridge *bridge)
 	/* Temporarily move resources off the list */
 	list_splice_init(&bridge->windows, &resources);
 	bus->sysdata = bridge->sysdata;
-	bus->msi = bridge->msi;
 	bus->ops = bridge->ops;
 	bus->number = bus->busn_res.start = bridge->busnr;
 #ifdef CONFIG_PCI_DOMAINS_GENERIC
@@ -926,6 +925,8 @@ static int pci_register_host_bridge(struct pci_host_bridge *bridge)
 	device_enable_async_suspend(bus->bridge);
 	pci_set_bus_of_node(bus);
 	pci_set_bus_msi_domain(bus);
+	if (bridge->msi_domain && !dev_get_msi_domain(&bus->dev))
+		bus->bus_flags |= PCI_BUS_FLAGS_NO_MSI;
 
 	if (!parent)
 		set_dev_node(bus->bridge, pcibus_to_node(bus));
@@ -1053,7 +1054,6 @@ static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
 		return NULL;
 
 	child->parent = parent;
-	child->msi = parent->msi;
 	child->sysdata = parent->sysdata;
 	child->bus_flags = parent->bus_flags;
 
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index af43b340853e..dcb229de1acb 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -2580,10 +2580,8 @@ static int msi_ht_cap_enabled(struct pci_dev *dev)
 /* Check the HyperTransport MSI mapping to know whether MSI is enabled or not */
 static void quirk_msi_ht_cap(struct pci_dev *dev)
 {
-	if (dev->subordinate && !msi_ht_cap_enabled(dev)) {
-		pci_warn(dev, "MSI quirk detected; subordinate MSI disabled\n");
-		dev->subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI;
-	}
+	if (!msi_ht_cap_enabled(dev))
+		quirk_disable_msi(dev);
 }
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_HT2000_PCIE,
 			quirk_msi_ht_cap);
@@ -2596,9 +2594,6 @@ static void quirk_nvidia_ck804_msi_ht_cap(struct pci_dev *dev)
 {
 	struct pci_dev *pdev;
 
-	if (!dev->subordinate)
-		return;
-
 	/*
 	 * Check HT MSI cap on this chipset and the root one.  A single one
 	 * having MSI is enough to be sure that MSI is supported.
@@ -2606,10 +2601,8 @@ static void quirk_nvidia_ck804_msi_ht_cap(struct pci_dev *dev)
 	pdev = pci_get_slot(dev->bus, 0);
 	if (!pdev)
 		return;
-	if (!msi_ht_cap_enabled(dev) && !msi_ht_cap_enabled(pdev)) {
-		pci_warn(dev, "MSI quirk detected; subordinate MSI disabled\n");
-		dev->subordinate->bus_flags |= PCI_BUS_FLAGS_NO_MSI;
-	}
+	if (!msi_ht_cap_enabled(pdev))
+		quirk_msi_ht_cap(dev);
 	pci_dev_put(pdev);
 }
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NVIDIA, PCI_DEVICE_ID_NVIDIA_CK804_PCIE,