| Message ID | 20240729142241.733357-18-sunilvl@ventanamicro.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | RISC-V: ACPI: Add external interrupt controller support | expand |
On Mon, Jul 29, 2024 at 7:54 PM Sunil V L <sunilvl@ventanamicro.com> wrote: > > Add ACPI support in PLIC driver. Use the mapping created early during > boot to get details about the PLIC. > > Signed-off-by: Sunil V L <sunilvl@ventanamicro.com> > Co-developed-by: Haibo Xu <haibo1.xu@intel.com> > Signed-off-by: Haibo Xu <haibo1.xu@intel.com> > --- > drivers/irqchip/irq-sifive-plic.c | 94 ++++++++++++++++++++++++------- > 1 file changed, 73 insertions(+), 21 deletions(-) > > diff --git a/drivers/irqchip/irq-sifive-plic.c b/drivers/irqchip/irq-sifive-plic.c > index 9e22f7e378f5..12d60728329c 100644 > --- a/drivers/irqchip/irq-sifive-plic.c > +++ b/drivers/irqchip/irq-sifive-plic.c > @@ -3,6 +3,7 @@ > * Copyright (C) 2017 SiFive > * Copyright (C) 2018 Christoph Hellwig > */ > +#include <linux/acpi.h> > #include <linux/cpu.h> > #include <linux/interrupt.h> > #include <linux/io.h> > @@ -70,6 +71,8 @@ struct plic_priv { > unsigned long plic_quirks; > unsigned int nr_irqs; > unsigned long *prio_save; > + u32 gsi_base; > + int id; Same as the other patch, better to call "id" as "acpi_id". > }; > > struct plic_handler { > @@ -324,6 +327,10 @@ static int plic_irq_domain_translate(struct irq_domain *d, > { > struct plic_priv *priv = d->host_data; > > + /* For DT, gsi_base is always zero. */ > + if (fwspec->param[0] >= priv->gsi_base) > + fwspec->param[0] = fwspec->param[0] - priv->gsi_base; > + > if (test_bit(PLIC_QUIRK_EDGE_INTERRUPT, &priv->plic_quirks)) > return irq_domain_translate_twocell(d, fwspec, hwirq, type); > > @@ -424,18 +431,37 @@ static const struct of_device_id plic_match[] = { > {} > }; > > +#ifdef CONFIG_ACPI > + > +static const struct acpi_device_id plic_acpi_match[] = { > + { "RSCV0001", 0 }, > + {} > +}; > +MODULE_DEVICE_TABLE(acpi, plic_acpi_match); > + > +#endif > static int plic_parse_nr_irqs_and_contexts(struct platform_device *pdev, > - u32 *nr_irqs, u32 *nr_contexts) > + u32 *nr_irqs, u32 *nr_contexts, > + u32 *gsi_base, u32 *id) > { > 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; > + if (!is_of_node(dev->fwnode)) { > + rc = riscv_acpi_get_gsi_info(dev->fwnode, gsi_base, id, nr_irqs, NULL); > + if (rc) { > + dev_err(dev, "failed to find GSI mapping\n"); > + return rc; > + } > + > + *nr_contexts = acpi_get_plic_nr_contexts(*id); > + if (WARN_ON(!*nr_contexts)) { > + dev_err(dev, "no PLIC context available\n"); > + return -EINVAL; > + } > + > + return 0; > + } > > rc = of_property_read_u32(to_of_node(dev->fwnode), "riscv,ndev", nr_irqs); > if (rc) { > @@ -449,23 +475,29 @@ static int plic_parse_nr_irqs_and_contexts(struct platform_device *pdev, > return -EINVAL; > } > > + *gsi_base = 0; > + *id = 0; > + > return 0; > } > > static int plic_parse_context_parent(struct platform_device *pdev, u32 context, > - u32 *parent_hwirq, int *parent_cpu) > + u32 *parent_hwirq, int *parent_cpu, u32 id) > { > struct device *dev = &pdev->dev; > struct of_phandle_args parent; > unsigned long hartid; > int rc; > > - /* > - * Currently, only OF fwnode is supported so extend this > - * function for ACPI support. > - */ > - if (!is_of_node(dev->fwnode)) > - return -EINVAL; > + if (!is_of_node(dev->fwnode)) { > + hartid = acpi_get_ext_intc_parent_hartid(id, context); > + if (hartid == INVALID_HARTID) > + return -EINVAL; > + > + *parent_cpu = riscv_hartid_to_cpuid(hartid); > + *parent_hwirq = RV_IRQ_EXT; > + return 0; > + } > > rc = of_irq_parse_one(to_of_node(dev->fwnode), context, &parent); > if (rc) > @@ -489,6 +521,8 @@ static int plic_probe(struct platform_device *pdev) > u32 nr_irqs, parent_hwirq; > struct plic_priv *priv; > irq_hw_number_t hwirq; > + int id, context_id; > + u32 gsi_base; > > if (is_of_node(dev->fwnode)) { > const struct of_device_id *id; > @@ -498,7 +532,7 @@ 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); > + error = plic_parse_nr_irqs_and_contexts(pdev, &nr_irqs, &nr_contexts, &gsi_base, &id); > if (error) > return error; > > @@ -509,6 +543,8 @@ static int plic_probe(struct platform_device *pdev) > priv->dev = dev; > priv->plic_quirks = plic_quirks; > priv->nr_irqs = nr_irqs; > + priv->gsi_base = gsi_base; > + priv->id = id; > > priv->regs = devm_platform_ioremap_resource(pdev, 0); > if (WARN_ON(!priv->regs)) > @@ -519,12 +555,22 @@ static int plic_probe(struct platform_device *pdev) > return -ENOMEM; > > for (i = 0; i < nr_contexts; i++) { > - error = plic_parse_context_parent(pdev, i, &parent_hwirq, &cpu); > + error = plic_parse_context_parent(pdev, i, &parent_hwirq, &cpu, priv->id); > if (error) { > dev_warn(dev, "hwirq for context%d not found\n", i); > continue; > } > > + if (is_of_node(dev->fwnode)) { > + context_id = i; > + } else { > + context_id = acpi_get_plic_context(priv->id, i); > + if (context_id == INVALID_CONTEXT) { > + dev_warn(dev, "invalid context id for context%d\n", i); > + continue; > + } > + } > + > /* > * Skip contexts other than external interrupts for our > * privilege level. > @@ -562,10 +608,10 @@ static int plic_probe(struct platform_device *pdev) > cpumask_set_cpu(cpu, &priv->lmask); > handler->present = true; > handler->hart_base = priv->regs + CONTEXT_BASE + > - i * CONTEXT_SIZE; > + context_id * CONTEXT_SIZE; > raw_spin_lock_init(&handler->enable_lock); > handler->enable_base = priv->regs + CONTEXT_ENABLE_BASE + > - i * CONTEXT_ENABLE_SIZE; > + context_id * CONTEXT_ENABLE_SIZE; > handler->priv = priv; > > handler->enable_save = devm_kcalloc(dev, DIV_ROUND_UP(nr_irqs, 32), > @@ -581,8 +627,8 @@ static int plic_probe(struct platform_device *pdev) > nr_handlers++; > } > > - priv->irqdomain = irq_domain_add_linear(to_of_node(dev->fwnode), nr_irqs + 1, > - &plic_irqdomain_ops, priv); > + priv->irqdomain = irq_domain_create_linear(dev->fwnode, nr_irqs + 1, > + &plic_irqdomain_ops, priv); > if (WARN_ON(!priv->irqdomain)) > goto fail_cleanup_contexts; > > @@ -619,13 +665,18 @@ static int plic_probe(struct platform_device *pdev) > } > } > > +#ifdef CONFIG_ACPI > + if (!acpi_disabled) > + acpi_dev_clear_dependencies(ACPI_COMPANION(dev)); > +#endif > + > dev_info(dev, "mapped %d interrupts with %d handlers for %d contexts.\n", > nr_irqs, nr_handlers, nr_contexts); > return 0; > > fail_cleanup_contexts: > for (i = 0; i < nr_contexts; i++) { > - if (plic_parse_context_parent(pdev, i, &parent_hwirq, &cpu)) > + if (plic_parse_context_parent(pdev, i, &parent_hwirq, &cpu, priv->id)) > continue; > if (parent_hwirq != RV_IRQ_EXT || cpu < 0) > continue; > @@ -644,6 +695,7 @@ static struct platform_driver plic_driver = { > .driver = { > .name = "riscv-plic", > .of_match_table = plic_match, > + .acpi_match_table = ACPI_PTR(plic_acpi_match), > }, > .probe = plic_probe, > }; > -- > 2.43.0 > Otherwise, this looks good to me. Reviewed-by: Anup Patel <anup@brainfault.org> Regards, Anup
diff --git a/drivers/irqchip/irq-sifive-plic.c b/drivers/irqchip/irq-sifive-plic.c index 9e22f7e378f5..12d60728329c 100644 --- a/drivers/irqchip/irq-sifive-plic.c +++ b/drivers/irqchip/irq-sifive-plic.c @@ -3,6 +3,7 @@ * Copyright (C) 2017 SiFive * Copyright (C) 2018 Christoph Hellwig */ +#include <linux/acpi.h> #include <linux/cpu.h> #include <linux/interrupt.h> #include <linux/io.h> @@ -70,6 +71,8 @@ struct plic_priv { unsigned long plic_quirks; unsigned int nr_irqs; unsigned long *prio_save; + u32 gsi_base; + int id; }; struct plic_handler { @@ -324,6 +327,10 @@ static int plic_irq_domain_translate(struct irq_domain *d, { struct plic_priv *priv = d->host_data; + /* For DT, gsi_base is always zero. */ + if (fwspec->param[0] >= priv->gsi_base) + fwspec->param[0] = fwspec->param[0] - priv->gsi_base; + if (test_bit(PLIC_QUIRK_EDGE_INTERRUPT, &priv->plic_quirks)) return irq_domain_translate_twocell(d, fwspec, hwirq, type); @@ -424,18 +431,37 @@ static const struct of_device_id plic_match[] = { {} }; +#ifdef CONFIG_ACPI + +static const struct acpi_device_id plic_acpi_match[] = { + { "RSCV0001", 0 }, + {} +}; +MODULE_DEVICE_TABLE(acpi, plic_acpi_match); + +#endif static int plic_parse_nr_irqs_and_contexts(struct platform_device *pdev, - u32 *nr_irqs, u32 *nr_contexts) + u32 *nr_irqs, u32 *nr_contexts, + u32 *gsi_base, u32 *id) { 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; + if (!is_of_node(dev->fwnode)) { + rc = riscv_acpi_get_gsi_info(dev->fwnode, gsi_base, id, nr_irqs, NULL); + if (rc) { + dev_err(dev, "failed to find GSI mapping\n"); + return rc; + } + + *nr_contexts = acpi_get_plic_nr_contexts(*id); + if (WARN_ON(!*nr_contexts)) { + dev_err(dev, "no PLIC context available\n"); + return -EINVAL; + } + + return 0; + } rc = of_property_read_u32(to_of_node(dev->fwnode), "riscv,ndev", nr_irqs); if (rc) { @@ -449,23 +475,29 @@ static int plic_parse_nr_irqs_and_contexts(struct platform_device *pdev, return -EINVAL; } + *gsi_base = 0; + *id = 0; + return 0; } static int plic_parse_context_parent(struct platform_device *pdev, u32 context, - u32 *parent_hwirq, int *parent_cpu) + u32 *parent_hwirq, int *parent_cpu, u32 id) { struct device *dev = &pdev->dev; struct of_phandle_args parent; unsigned long hartid; int rc; - /* - * Currently, only OF fwnode is supported so extend this - * function for ACPI support. - */ - if (!is_of_node(dev->fwnode)) - return -EINVAL; + if (!is_of_node(dev->fwnode)) { + hartid = acpi_get_ext_intc_parent_hartid(id, context); + if (hartid == INVALID_HARTID) + return -EINVAL; + + *parent_cpu = riscv_hartid_to_cpuid(hartid); + *parent_hwirq = RV_IRQ_EXT; + return 0; + } rc = of_irq_parse_one(to_of_node(dev->fwnode), context, &parent); if (rc) @@ -489,6 +521,8 @@ static int plic_probe(struct platform_device *pdev) u32 nr_irqs, parent_hwirq; struct plic_priv *priv; irq_hw_number_t hwirq; + int id, context_id; + u32 gsi_base; if (is_of_node(dev->fwnode)) { const struct of_device_id *id; @@ -498,7 +532,7 @@ 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); + error = plic_parse_nr_irqs_and_contexts(pdev, &nr_irqs, &nr_contexts, &gsi_base, &id); if (error) return error; @@ -509,6 +543,8 @@ static int plic_probe(struct platform_device *pdev) priv->dev = dev; priv->plic_quirks = plic_quirks; priv->nr_irqs = nr_irqs; + priv->gsi_base = gsi_base; + priv->id = id; priv->regs = devm_platform_ioremap_resource(pdev, 0); if (WARN_ON(!priv->regs)) @@ -519,12 +555,22 @@ static int plic_probe(struct platform_device *pdev) return -ENOMEM; for (i = 0; i < nr_contexts; i++) { - error = plic_parse_context_parent(pdev, i, &parent_hwirq, &cpu); + error = plic_parse_context_parent(pdev, i, &parent_hwirq, &cpu, priv->id); if (error) { dev_warn(dev, "hwirq for context%d not found\n", i); continue; } + if (is_of_node(dev->fwnode)) { + context_id = i; + } else { + context_id = acpi_get_plic_context(priv->id, i); + if (context_id == INVALID_CONTEXT) { + dev_warn(dev, "invalid context id for context%d\n", i); + continue; + } + } + /* * Skip contexts other than external interrupts for our * privilege level. @@ -562,10 +608,10 @@ static int plic_probe(struct platform_device *pdev) cpumask_set_cpu(cpu, &priv->lmask); handler->present = true; handler->hart_base = priv->regs + CONTEXT_BASE + - i * CONTEXT_SIZE; + context_id * CONTEXT_SIZE; raw_spin_lock_init(&handler->enable_lock); handler->enable_base = priv->regs + CONTEXT_ENABLE_BASE + - i * CONTEXT_ENABLE_SIZE; + context_id * CONTEXT_ENABLE_SIZE; handler->priv = priv; handler->enable_save = devm_kcalloc(dev, DIV_ROUND_UP(nr_irqs, 32), @@ -581,8 +627,8 @@ static int plic_probe(struct platform_device *pdev) nr_handlers++; } - priv->irqdomain = irq_domain_add_linear(to_of_node(dev->fwnode), nr_irqs + 1, - &plic_irqdomain_ops, priv); + priv->irqdomain = irq_domain_create_linear(dev->fwnode, nr_irqs + 1, + &plic_irqdomain_ops, priv); if (WARN_ON(!priv->irqdomain)) goto fail_cleanup_contexts; @@ -619,13 +665,18 @@ static int plic_probe(struct platform_device *pdev) } } +#ifdef CONFIG_ACPI + if (!acpi_disabled) + acpi_dev_clear_dependencies(ACPI_COMPANION(dev)); +#endif + dev_info(dev, "mapped %d interrupts with %d handlers for %d contexts.\n", nr_irqs, nr_handlers, nr_contexts); return 0; fail_cleanup_contexts: for (i = 0; i < nr_contexts; i++) { - if (plic_parse_context_parent(pdev, i, &parent_hwirq, &cpu)) + if (plic_parse_context_parent(pdev, i, &parent_hwirq, &cpu, priv->id)) continue; if (parent_hwirq != RV_IRQ_EXT || cpu < 0) continue; @@ -644,6 +695,7 @@ static struct platform_driver plic_driver = { .driver = { .name = "riscv-plic", .of_match_table = plic_match, + .acpi_match_table = ACPI_PTR(plic_acpi_match), }, .probe = plic_probe, };