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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 <grigory.kletsko@cogentembedded.com>
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Simon Horman <horms+renesas@verge.net.au>
hifive-unleashed-5.1
Grigory Kletsko 2016-09-08 22:32:59 +03:00 committed by Bjorn Helgaas
parent 3d664b070c
commit e3123c20c8
1 changed files with 70 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

72
drivers/pci/host/pcie-rcar.c
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@ -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,