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irqchip/sifive-plic: Parse number of interrupts and contexts early in plic_probe()

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The SiFive PLIC driver needs to know the number of interrupts and contexts
to complete initialization. Parse these details early in plic_probe() to
avoid unnecessary memory allocations and register mappings if these details
are not available.

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20240222094006.1030709-7-apatel@ventanamicro.com
This commit is contained in:
Anup Patel 2024-02-22 15:09:54 +05:30 committed by Thomas Gleixner
parent a15587277a
commit 9565210647
1 changed files with 33 additions and 10 deletions
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43
drivers/irqchip/irq-sifive-plic.c
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@ -417,6 +417,34 @@ static const struct of_device_id plic_match[] = {
{}
};
static int plic_parse_nr_irqs_and_contexts(struct platform_device *pdev,
u32 *nr_irqs, u32 *nr_contexts)
{
struct device *dev = &pdev->dev;
int rc;
/*
* Currently, only OF fwnode is supported so extend this
* function for ACPI support.
*/
if (!is_of_node(dev->fwnode))
return -EINVAL;
rc = of_property_read_u32(to_of_node(dev->fwnode), "riscv,ndev", nr_irqs);
if (rc) {
dev_err(dev, "riscv,ndev property not available\n");
return rc;
}
*nr_contexts = of_irq_count(to_of_node(dev->fwnode));
if (WARN_ON(!(*nr_contexts))) {
dev_err(dev, "no PLIC context available\n");
return -EINVAL;
}
return 0;
}
static int plic_parse_context_parent(struct platform_device *pdev, u32 context,
u32 *parent_hwirq, int *parent_cpu)
{
@ -465,31 +493,26 @@ static int plic_probe(struct platform_device *pdev)
plic_quirks = (unsigned long)id->data;
}
error = plic_parse_nr_irqs_and_contexts(pdev, &nr_irqs, &nr_contexts);
if (error)
return error;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->dev = dev;
priv->plic_quirks = plic_quirks;
priv->nr_irqs = nr_irqs;
priv->regs = devm_platform_ioremap_resource(pdev, 0);
if (WARN_ON(!priv->regs))
return -EIO;
of_property_read_u32(to_of_node(dev->fwnode), "riscv,ndev", &nr_irqs);
if (WARN_ON(!nr_irqs))
return -EINVAL;
priv->nr_irqs = nr_irqs;
priv->prio_save = devm_bitmap_zalloc(dev, nr_irqs, GFP_KERNEL);
if (!priv->prio_save)
return -ENOMEM;
nr_contexts = of_irq_count(to_of_node(dev->fwnode));
if (WARN_ON(!nr_contexts))
return -EINVAL;
for (i = 0; i < nr_contexts; i++) {
error = plic_parse_context_parent(pdev, i, &parent_hwirq, &cpu);
if (error) {