diff mbox series

[v3,03/14] PCI: rcar: Convert to MSI domains

Message ID 20210330151145.997953-4-maz@kernel.org (mailing list archive)
State New
Headers show
Series PCI/MSI: Getting rid of msi_controller, and other cleanups | expand

Commit Message

Marc Zyngier March 30, 2021, 3:11 p.m. UTC
In anticipation of the removal of the msi_controller structure, convert
the Rcar host controller driver to MSI domains.

We end-up with the usual two domain structure, the top one being a
generic PCI/MSI domain, the bottom one being Rcar-specific and handling
the actual HW interrupt allocation.

Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 drivers/pci/controller/Kconfig          |   1 -
 drivers/pci/controller/pcie-rcar-host.c | 352 ++++++++++++------------
 2 files changed, 170 insertions(+), 183 deletions(-)

Comments

Lorenzo Pieralisi April 1, 2021, 10:19 a.m. UTC | #1
On Tue, Mar 30, 2021 at 04:11:34PM +0100, Marc Zyngier wrote:

[...]

> +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);
> +	unsigned long pa = virt_to_phys(msi);
>  
> -	hwirq = rcar_msi_alloc_region(msi, nvec);
> -	if (hwirq < 0)
> -		return -ENOSPC;
> +	/* Use the msi structure as the PA for the MSI doorbell */
> +	msg->address_lo = lower_32_bits(pa);
> +	msg->address_hi = upper_32_bits(pa);

I don't think this change is aligned with the previous patch (is it ?),
the PA address we are using here is different from the one programmed
into the controller registers - either that or I am missing something,
please let me know.

Thanks,
Lorenzo

> +	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;
> +
> +	mutex_lock(&msi->map_lock);
>  
> -	desc->nvec_used = nvec;
> -	desc->msi_attrib.multiple = order_base_2(nvec);
> +	hwirq = bitmap_find_free_region(msi->used, INT_PCI_MSI_NR, order_base_2(nr_irqs));
>  
> -	msg.address_lo = rcar_pci_read_reg(pcie, PCIEMSIALR) & ~MSIFE;
> -	msg.address_hi = rcar_pci_read_reg(pcie, PCIEMSIAUR);
> -	msg.data = hwirq;
> +	mutex_unlock(&msi->map_lock);
> +
> +	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,
> +				    &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);
> +	struct irq_data *d = irq_domain_get_irq_data(domain, virq);
> +	struct rcar_msi *msi = domain->host_data;
>  
> -	rcar_msi_free(msi, d->hwirq);
> -}
> -
> -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 device *dev = pcie->dev;
> -	struct resource res;
> +	struct irq_domain *parent = msi->domain->parent;
>  
> -	if (WARN_ON(of_address_to_resource(dev->of_node, 0, &res)))
> -		return;
> -
> -	/* setup MSI data target */
> -	rcar_pci_write_reg(pcie, lower_32_bits(res.start) | MSIFE, PCIEMSIALR);
> -	rcar_pci_write_reg(pcie, upper_32_bits(res.start), 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 +675,24 @@ 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;
> @@ -728,19 +700,26 @@ 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 */
> -	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;
>  }
>  
> @@ -754,7 +733,7 @@ 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);
>  
> -	rcar_pcie_unmap_msi(host);
> +	rcar_free_domains(&host->msi);
>  }
>  
>  static int rcar_pcie_get_resources(struct rcar_pcie_host *host)
> @@ -1007,8 +986,17 @@ 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);
>  
> -- 
> 2.29.2
>
Marc Zyngier April 1, 2021, 10:38 a.m. UTC | #2
On Thu, 01 Apr 2021 11:19:57 +0100,
Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> wrote:
> 
> On Tue, Mar 30, 2021 at 04:11:34PM +0100, Marc Zyngier wrote:
> 
> [...]
> 
> > +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);
> > +	unsigned long pa = virt_to_phys(msi);
> >  
> > -	hwirq = rcar_msi_alloc_region(msi, nvec);
> > -	if (hwirq < 0)
> > -		return -ENOSPC;
> > +	/* Use the msi structure as the PA for the MSI doorbell */
> > +	msg->address_lo = lower_32_bits(pa);
> > +	msg->address_hi = upper_32_bits(pa);
> 
> I don't think this change is aligned with the previous patch (is it ?),
> the PA address we are using here is different from the one programmed
> into the controller registers - either that or I am missing something,
> please let me know.

Err. You are right. This looks like a bad case of broken conflict
resolution on my part.

The following snippet should fix it. Let me know if you want me to
resend the whole thing or whether you are OK with applying this by
hand.

Thanks,

	M.

diff --git a/drivers/pci/controller/pcie-rcar-host.c b/drivers/pci/controller/pcie-rcar-host.c
index f7331ad0d6dc..765cf2b45e24 100644
--- a/drivers/pci/controller/pcie-rcar-host.c
+++ b/drivers/pci/controller/pcie-rcar-host.c
@@ -573,11 +573,10 @@ static int rcar_msi_set_affinity(struct irq_data *d, const struct cpumask *mask,
 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);
-	unsigned long pa = virt_to_phys(msi);
+	struct rcar_pcie *pcie = &msi_to_host(msi)->pcie;
 
-	/* Use the msi structure as the PA for the MSI doorbell */
-	msg->address_lo = lower_32_bits(pa);
-	msg->address_hi = upper_32_bits(pa);
+	msg->address_lo = rcar_pci_read_reg(pcie, PCIEMSIALR) & ~MSIFE;
+	msg->address_hi = rcar_pci_read_reg(pcie, PCIEMSIAUR);
 	msg->data = data->hwirq;
 }
Lorenzo Pieralisi April 1, 2021, 11:03 a.m. UTC | #3
On Thu, Apr 01, 2021 at 11:38:19AM +0100, Marc Zyngier wrote:
> On Thu, 01 Apr 2021 11:19:57 +0100,
> Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> wrote:
> > 
> > On Tue, Mar 30, 2021 at 04:11:34PM +0100, Marc Zyngier wrote:
> > 
> > [...]
> > 
> > > +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);
> > > +	unsigned long pa = virt_to_phys(msi);
> > >  
> > > -	hwirq = rcar_msi_alloc_region(msi, nvec);
> > > -	if (hwirq < 0)
> > > -		return -ENOSPC;
> > > +	/* Use the msi structure as the PA for the MSI doorbell */
> > > +	msg->address_lo = lower_32_bits(pa);
> > > +	msg->address_hi = upper_32_bits(pa);
> > 
> > I don't think this change is aligned with the previous patch (is it ?),
> > the PA address we are using here is different from the one programmed
> > into the controller registers - either that or I am missing something,
> > please let me know.
> 
> Err. You are right. This looks like a bad case of broken conflict
> resolution on my part.
> 
> The following snippet should fix it. Let me know if you want me to
> resend the whole thing or whether you are OK with applying this by
> hand.

I will apply it and merge the whole series into -next, thanks for
implementing it !

Lorenzo

> Thanks,
> 
> 	M.
> 
> diff --git a/drivers/pci/controller/pcie-rcar-host.c b/drivers/pci/controller/pcie-rcar-host.c
> index f7331ad0d6dc..765cf2b45e24 100644
> --- a/drivers/pci/controller/pcie-rcar-host.c
> +++ b/drivers/pci/controller/pcie-rcar-host.c
> @@ -573,11 +573,10 @@ static int rcar_msi_set_affinity(struct irq_data *d, const struct cpumask *mask,
>  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);
> -	unsigned long pa = virt_to_phys(msi);
> +	struct rcar_pcie *pcie = &msi_to_host(msi)->pcie;
>  
> -	/* Use the msi structure as the PA for the MSI doorbell */
> -	msg->address_lo = lower_32_bits(pa);
> -	msg->address_hi = upper_32_bits(pa);
> +	msg->address_lo = rcar_pci_read_reg(pcie, PCIEMSIALR) & ~MSIFE;
> +	msg->address_hi = rcar_pci_read_reg(pcie, PCIEMSIAUR);
>  	msg->data = data->hwirq;
>  }
>  
> 
> -- 
> Without deviation from the norm, progress is not possible.
diff mbox series

Patch

diff --git a/drivers/pci/controller/Kconfig b/drivers/pci/controller/Kconfig
index be8f9ff512a0..5cc07d28a3a0 100644
--- a/drivers/pci/controller/Kconfig
+++ b/drivers/pci/controller/Kconfig
@@ -58,7 +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.
diff --git a/drivers/pci/controller/pcie-rcar-host.c b/drivers/pci/controller/pcie-rcar-host.c
index ce952403e22c..f7331ad0d6dc 100644
--- a/drivers/pci/controller/pcie-rcar-host.c
+++ b/drivers/pci/controller/pcie-rcar-host.c
@@ -35,17 +35,12 @@ 
 struct rcar_msi {
 	DECLARE_BITMAP(used, INT_PCI_MSI_NR);
 	struct irq_domain *domain;
-	struct msi_controller chip;
-	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;
@@ -55,6 +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);
@@ -291,8 +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);
 }
@@ -472,42 +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;
@@ -526,18 +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 */
@@ -547,150 +504,170 @@  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);
+	unsigned long pa = virt_to_phys(msi);
 
-	hwirq = rcar_msi_alloc_region(msi, nvec);
-	if (hwirq < 0)
-		return -ENOSPC;
+	/* Use the msi structure as the PA for the MSI doorbell */
+	msg->address_lo = lower_32_bits(pa);
+	msg->address_hi = upper_32_bits(pa);
+	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;
+
+	mutex_lock(&msi->map_lock);
 
-	desc->nvec_used = nvec;
-	desc->msi_attrib.multiple = order_base_2(nvec);
+	hwirq = bitmap_find_free_region(msi->used, INT_PCI_MSI_NR, order_base_2(nr_irqs));
 
-	msg.address_lo = rcar_pci_read_reg(pcie, PCIEMSIALR) & ~MSIFE;
-	msg.address_hi = rcar_pci_read_reg(pcie, PCIEMSIAUR);
-	msg.data = hwirq;
+	mutex_unlock(&msi->map_lock);
+
+	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,
+				    &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);
+	struct irq_data *d = irq_domain_get_irq_data(domain, virq);
+	struct rcar_msi *msi = domain->host_data;
 
-	rcar_msi_free(msi, d->hwirq);
-}
-
-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 device *dev = pcie->dev;
-	struct resource res;
+	struct irq_domain *parent = msi->domain->parent;
 
-	if (WARN_ON(of_address_to_resource(dev->of_node, 0, &res)))
-		return;
-
-	/* setup MSI data target */
-	rcar_pci_write_reg(pcie, lower_32_bits(res.start) | MSIFE, PCIEMSIALR);
-	rcar_pci_write_reg(pcie, upper_32_bits(res.start), 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 +675,24 @@  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;
@@ -728,19 +700,26 @@  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 */
-	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;
 }
 
@@ -754,7 +733,7 @@  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);
 
-	rcar_pcie_unmap_msi(host);
+	rcar_free_domains(&host->msi);
 }
 
 static int rcar_pcie_get_resources(struct rcar_pcie_host *host)
@@ -1007,8 +986,17 @@  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);