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PCI: aardvark: Move to MSI handling using generic MSI support 

The MSI support introduced with the initial Aardvark driver was based
on the msi_controller structure and the of_pci_msi_chip_add() /
of_pci_find_msi_chip_by_node() API, which are being deprecated in
favor of the generic MSI support.

Update the Aardvark driver to use the generic MSI support.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Thomas Petazzoni 2017-02-28 15:31:14 +01:00 committed by Bjorn Helgaas
parent 688769f643
commit f21a8b1b68
1 changed files with 76 additions and 115 deletions
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191
drivers/pci/host/pci-aardvark.c
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@ -200,10 +200,12 @@ struct advk_pcie {
struct list_head resources;
struct irq_domain *irq_domain;
struct irq_chip irq_chip;
struct msi_controller msi;
struct irq_domain *msi_domain;
struct irq_domain *msi_inner_domain;
struct irq_chip msi_bottom_irq_chip;
struct irq_chip msi_irq_chip;
DECLARE_BITMAP(msi_irq_in_use, MSI_IRQ_NUM);
struct msi_domain_info msi_domain_info;
DECLARE_BITMAP(msi_used, MSI_IRQ_NUM);
struct mutex msi_used_lock;
u16 msi_msg;
int root_bus_nr;
@ -545,94 +547,64 @@ static struct pci_ops advk_pcie_ops = {
.write = advk_pcie_wr_conf,
};
static int advk_pcie_alloc_msi(struct advk_pcie *pcie)
static void advk_msi_irq_compose_msi_msg(struct irq_data *data,
struct msi_msg *msg)
{
int hwirq;
struct advk_pcie *pcie = irq_data_get_irq_chip_data(data);
phys_addr_t msi_msg = virt_to_phys(&pcie->msi_msg);
msg->address_lo = lower_32_bits(msi_msg);
msg->address_hi = upper_32_bits(msi_msg);
msg->data = data->irq;
}
static int advk_msi_set_affinity(struct irq_data *irq_data,
const struct cpumask *mask, bool force)
{
return -EINVAL;
}
static int advk_msi_irq_domain_alloc(struct irq_domain *domain,
unsigned int virq,
unsigned int nr_irqs, void *args)
{
struct advk_pcie *pcie = domain->host_data;
int hwirq, i;
mutex_lock(&pcie->msi_used_lock);
hwirq = find_first_zero_bit(pcie->msi_irq_in_use, MSI_IRQ_NUM);
if (hwirq >= MSI_IRQ_NUM)
hwirq = -ENOSPC;
else
set_bit(hwirq, pcie->msi_irq_in_use);
hwirq = bitmap_find_next_zero_area(pcie->msi_used, MSI_IRQ_NUM,
0, nr_irqs, 0);
if (hwirq >= MSI_IRQ_NUM) {
mutex_unlock(&pcie->msi_used_lock);
return -ENOSPC;
}
bitmap_set(pcie->msi_used, hwirq, nr_irqs);
mutex_unlock(&pcie->msi_used_lock);
for (i = 0; i < nr_irqs; i++)
irq_domain_set_info(domain, virq + i, hwirq + i,
&pcie->msi_bottom_irq_chip,
domain->host_data, handle_simple_irq,
NULL, NULL);
return hwirq;
}
static void advk_pcie_free_msi(struct advk_pcie *pcie, int hwirq)
static void advk_msi_irq_domain_free(struct irq_domain *domain,
unsigned int virq, unsigned int nr_irqs)
{
struct device *dev = &pcie->pdev->dev;
struct irq_data *d = irq_domain_get_irq_data(domain, virq);
struct advk_pcie *pcie = domain->host_data;
mutex_lock(&pcie->msi_used_lock);
if (!test_bit(hwirq, pcie->msi_irq_in_use))
dev_err(dev, "trying to free unused MSI#%d\n", hwirq);
else
clear_bit(hwirq, pcie->msi_irq_in_use);
bitmap_clear(pcie->msi_used, d->hwirq, nr_irqs);
mutex_unlock(&pcie->msi_used_lock);
}
static int advk_pcie_setup_msi_irq(struct msi_controller *chip,
struct pci_dev *pdev,
struct msi_desc *desc)
{
struct advk_pcie *pcie = pdev->bus->sysdata;
struct msi_msg msg;
int virq, hwirq;
phys_addr_t msi_msg_phys;
/* We support MSI, but not MSI-X */
if (desc->msi_attrib.is_msix)
return -EINVAL;
hwirq = advk_pcie_alloc_msi(pcie);
if (hwirq < 0)
return hwirq;
virq = irq_create_mapping(pcie->msi_domain, hwirq);
if (!virq) {
advk_pcie_free_msi(pcie, hwirq);
return -EINVAL;
}
irq_set_msi_desc(virq, desc);
msi_msg_phys = virt_to_phys(&pcie->msi_msg);
msg.address_lo = lower_32_bits(msi_msg_phys);
msg.address_hi = upper_32_bits(msi_msg_phys);
msg.data = virq;
pci_write_msi_msg(virq, &msg);
return 0;
}
static void advk_pcie_teardown_msi_irq(struct msi_controller *chip,
unsigned int irq)
{
struct irq_data *d = irq_get_irq_data(irq);
struct msi_desc *msi = irq_data_get_msi_desc(d);
struct advk_pcie *pcie = msi_desc_to_pci_sysdata(msi);
unsigned long hwirq = d->hwirq;
irq_dispose_mapping(irq);
advk_pcie_free_msi(pcie, hwirq);
}
static int advk_pcie_msi_map(struct irq_domain *domain,
unsigned int virq, irq_hw_number_t hw)
{
struct advk_pcie *pcie = domain->host_data;
irq_set_chip_and_handler(virq, &pcie->msi_irq_chip,
handle_simple_irq);
return 0;
}
static const struct irq_domain_ops advk_pcie_msi_irq_ops = {
.map = advk_pcie_msi_map,
static const struct irq_domain_ops advk_msi_domain_ops = {
.alloc = advk_msi_irq_domain_alloc,
.free = advk_msi_irq_domain_free,
};
static void advk_pcie_irq_mask(struct irq_data *d)
@ -680,31 +652,26 @@ static int advk_pcie_init_msi_irq_domain(struct advk_pcie *pcie)
{
struct device *dev = &pcie->pdev->dev;
struct device_node *node = dev->of_node;
struct irq_chip *msi_irq_chip;
struct msi_controller *msi;
struct irq_chip *bottom_ic, *msi_ic;
struct msi_domain_info *msi_di;
phys_addr_t msi_msg_phys;
int ret;
msi_irq_chip = &pcie->msi_irq_chip;
msi_irq_chip->name = devm_kasprintf(dev, GFP_KERNEL, "%s-msi",
dev_name(dev));
if (!msi_irq_chip->name)
return -ENOMEM;
msi_irq_chip->irq_enable = pci_msi_unmask_irq;
msi_irq_chip->irq_disable = pci_msi_mask_irq;
msi_irq_chip->irq_mask = pci_msi_mask_irq;
msi_irq_chip->irq_unmask = pci_msi_unmask_irq;
msi = &pcie->msi;
msi->setup_irq = advk_pcie_setup_msi_irq;
msi->teardown_irq = advk_pcie_teardown_msi_irq;
msi->of_node = node;
mutex_init(&pcie->msi_used_lock);
bottom_ic = &pcie->msi_bottom_irq_chip;
bottom_ic->name = "MSI";
bottom_ic->irq_compose_msi_msg = advk_msi_irq_compose_msi_msg;
bottom_ic->irq_set_affinity = advk_msi_set_affinity;
msi_ic = &pcie->msi_irq_chip;
msi_ic->name = "advk-MSI";
msi_di = &pcie->msi_domain_info;
msi_di->flags = MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
MSI_FLAG_MULTI_PCI_MSI;
msi_di->chip = msi_ic;
msi_msg_phys = virt_to_phys(&pcie->msi_msg);
advk_writel(pcie, lower_32_bits(msi_msg_phys),
@ -712,16 +679,18 @@ static int advk_pcie_init_msi_irq_domain(struct advk_pcie *pcie)
advk_writel(pcie, upper_32_bits(msi_msg_phys),
PCIE_MSI_ADDR_HIGH_REG);
pcie->msi_domain =
pcie->msi_inner_domain =
irq_domain_add_linear(NULL, MSI_IRQ_NUM,
&advk_pcie_msi_irq_ops, pcie);
if (!pcie->msi_domain)
&advk_msi_domain_ops, pcie);
if (!pcie->msi_inner_domain)
return -ENOMEM;
ret = of_pci_msi_chip_add(msi);
if (ret < 0) {
irq_domain_remove(pcie->msi_domain);
return ret;
pcie->msi_domain =
pci_msi_create_irq_domain(of_node_to_fwnode(node),
msi_di, pcie->msi_inner_domain);
if (!pcie->msi_domain) {
irq_domain_remove(pcie->msi_inner_domain);
return -ENOMEM;
}
return 0;
@ -729,8 +698,8 @@ static int advk_pcie_init_msi_irq_domain(struct advk_pcie *pcie)
static void advk_pcie_remove_msi_irq_domain(struct advk_pcie *pcie)
{
of_pci_msi_chip_remove(&pcie->msi);
irq_domain_remove(pcie->msi_domain);
irq_domain_remove(pcie->msi_inner_domain);
}
static int advk_pcie_init_irq_domain(struct advk_pcie *pcie)
@ -917,8 +886,6 @@ static int advk_pcie_probe(struct platform_device *pdev)
struct advk_pcie *pcie;
struct resource *res;
struct pci_bus *bus, *child;
struct msi_controller *msi;
struct device_node *msi_node;
int ret, irq;
pcie = devm_kzalloc(dev, sizeof(struct advk_pcie), GFP_KERNEL);
@ -962,14 +929,8 @@ static int advk_pcie_probe(struct platform_device *pdev)
return ret;
}
msi_node = of_parse_phandle(dev->of_node, "msi-parent", 0);
if (msi_node)
msi = of_pci_find_msi_chip_by_node(msi_node);
else
msi = NULL;
bus = pci_scan_root_bus_msi(dev, 0, &advk_pcie_ops,
pcie, &pcie->resources, &pcie->msi);
bus = pci_scan_root_bus(dev, 0, &advk_pcie_ops,
pcie, &pcie->resources);
if (!bus) {
advk_pcie_remove_msi_irq_domain(pcie);
advk_pcie_remove_irq_domain(pcie);