From e3123c20c8075f1771947e10cb7e9681166f2e89 Mon Sep 17 00:00:00 2001 From: Grigory Kletsko Date: Thu, 8 Sep 2016 22:32:59 +0300 Subject: [PATCH] PCI: rcar: Add multi-MSI support Implement the MSI .setup_irqs() method which enables allocation of several MSIs at once. [Sergei Shtylyov: removed unrelated/unneeded changes, fixed too long lines, reordered the variable declarations, reworded the summary/description.] Signed-off-by: Grigory Kletsko Signed-off-by: Sergei Shtylyov Signed-off-by: Bjorn Helgaas Acked-by: Simon Horman --- drivers/pci/host/pcie-rcar.c | 72 +++++++++++++++++++++++++++++++++++- 1 file changed, 70 insertions(+), 2 deletions(-) diff --git a/drivers/pci/host/pcie-rcar.c b/drivers/pci/host/pcie-rcar.c index 45dc3cd74c03..d6e72db29a21 100644 --- a/drivers/pci/host/pcie-rcar.c +++ b/drivers/pci/host/pcie-rcar.c @@ -608,6 +608,18 @@ static int rcar_msi_alloc(struct rcar_msi *chip) 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); @@ -665,7 +677,7 @@ static int rcar_msi_setup_irq(struct msi_controller *chip, struct pci_dev *pdev, if (hwirq < 0) return hwirq; - irq = irq_create_mapping(msi->domain, hwirq); + irq = irq_find_mapping(msi->domain, hwirq); if (!irq) { rcar_msi_free(msi, hwirq); return -EINVAL; @@ -682,6 +694,58 @@ static int rcar_msi_setup_irq(struct msi_controller *chip, struct pci_dev *pdev, return 0; } +static int rcar_msi_setup_irqs(struct msi_controller *chip, + struct pci_dev *pdev, int nvec, int type) +{ + struct rcar_pcie *pcie = container_of(chip, struct rcar_pcie, msi.chip); + struct rcar_msi *msi = to_rcar_msi(chip); + struct msi_desc *desc; + struct msi_msg msg; + unsigned int irq; + int hwirq; + int i; + + /* MSI-X interrupts are not supported */ + if (type == PCI_CAP_ID_MSIX) + return -EINVAL; + + WARN_ON(!list_is_singular(&pdev->dev.msi_list)); + desc = list_entry(pdev->dev.msi_list.next, struct msi_desc, list); + + hwirq = rcar_msi_alloc_region(msi, nvec); + if (hwirq < 0) + return -ENOSPC; + + irq = irq_find_mapping(msi->domain, hwirq); + if (!irq) + return -ENOSPC; + + 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; + } + } + + desc->nvec_used = nvec; + desc->msi_attrib.multiple = order_base_2(nvec); + + msg.address_lo = rcar_pci_read_reg(pcie, PCIEMSIALR) & ~MSIFE; + msg.address_hi = rcar_pci_read_reg(pcie, PCIEMSIAUR); + msg.data = hwirq; + + pci_write_msi_msg(irq, &msg); + + return 0; +} + static void rcar_msi_teardown_irq(struct msi_controller *chip, unsigned int irq) { struct rcar_msi *msi = to_rcar_msi(chip); @@ -716,12 +780,13 @@ static int rcar_pcie_enable_msi(struct rcar_pcie *pcie) struct platform_device *pdev = to_platform_device(pcie->dev); struct rcar_msi *msi = &pcie->msi; unsigned long base; - int err; + int err, i; mutex_init(&msi->lock); msi->chip.dev = pcie->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; msi->domain = irq_domain_add_linear(pcie->dev->of_node, INT_PCI_MSI_NR, @@ -731,6 +796,9 @@ static int rcar_pcie_enable_msi(struct rcar_pcie *pcie) return -ENOMEM; } + for (i = 0; i < INT_PCI_MSI_NR; i++) + irq_create_mapping(msi->domain, i); + /* Two irqs are for MSI, but they are also used for non-MSI irqs */ err = devm_request_irq(&pdev->dev, msi->irq1, rcar_pcie_msi_irq, IRQF_SHARED | IRQF_NO_THREAD, -- 2.39.5