From: Anup Patel <apatel@ventanamicro.com>
To: Palmer Dabbelt <palmer@dabbelt.com>,
Paul Walmsley <paul.walmsley@sifive.com>,
Thomas Gleixner <tglx@linutronix.de>,
Rob Herring <robh+dt@kernel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
Frank Rowand <frowand.list@gmail.com>,
Conor Dooley <conor+dt@kernel.org>
Cc: "Anup Patel" <apatel@ventanamicro.com>,
devicetree@vger.kernel.org,
"Saravana Kannan" <saravanak@google.com>,
"Marc Zyngier" <maz@kernel.org>,
"Anup Patel" <anup@brainfault.org>,
linux-kernel@vger.kernel.org, "Björn Töpel" <bjorn@kernel.org>,
"Atish Patra" <atishp@atishpatra.org>,
linux-riscv@lists.infradead.org,
linux-arm-kernel@lists.infradead.org,
"Andrew Jones" <ajones@ventanamicro.com>
Subject: [PATCH v14 01/18] irqchip/sifive-plic: Convert PLIC driver into a platform driver
Date: Thu, 22 Feb 2024 15:09:49 +0530 [thread overview]
Message-ID: <20240222094006.1030709-2-apatel@ventanamicro.com> (raw)
In-Reply-To: <20240222094006.1030709-1-apatel@ventanamicro.com>
The PLIC driver does not require very early initialization so convert
it into a platform driver.
After conversion, the PLIC driver is probed after CPUs are brought-up
so setup cpuhp state after context handler of all online CPUs are
initialized otherwise PLIC driver crashes for platforms with multiple
PLIC instances.
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
---
drivers/irqchip/irq-sifive-plic.c | 101 ++++++++++++++++++------------
1 file changed, 61 insertions(+), 40 deletions(-)
diff --git a/drivers/irqchip/irq-sifive-plic.c b/drivers/irqchip/irq-sifive-plic.c
index 5b7bc4fd9517..7400a07fc479 100644
--- a/drivers/irqchip/irq-sifive-plic.c
+++ b/drivers/irqchip/irq-sifive-plic.c
@@ -64,6 +64,7 @@
#define PLIC_QUIRK_EDGE_INTERRUPT 0
struct plic_priv {
+ struct device *dev;
struct cpumask lmask;
struct irq_domain *irqdomain;
void __iomem *regs;
@@ -406,30 +407,50 @@ static int plic_starting_cpu(unsigned int cpu)
return 0;
}
-static int __init __plic_init(struct device_node *node,
- struct device_node *parent,
- unsigned long plic_quirks)
+static const struct of_device_id plic_match[] = {
+ { .compatible = "sifive,plic-1.0.0" },
+ { .compatible = "riscv,plic0" },
+ { .compatible = "andestech,nceplic100",
+ .data = (const void *)BIT(PLIC_QUIRK_EDGE_INTERRUPT) },
+ { .compatible = "thead,c900-plic",
+ .data = (const void *)BIT(PLIC_QUIRK_EDGE_INTERRUPT) },
+ {}
+};
+
+static int plic_probe(struct platform_device *pdev)
{
int error = 0, nr_contexts, nr_handlers = 0, i;
- u32 nr_irqs;
- struct plic_priv *priv;
+ struct device *dev = &pdev->dev;
+ unsigned long plic_quirks = 0;
struct plic_handler *handler;
+ struct plic_priv *priv;
+ bool cpuhp_setup;
unsigned int cpu;
+ u32 nr_irqs;
+
+ if (is_of_node(dev->fwnode)) {
+ const struct of_device_id *id;
+
+ id = of_match_node(plic_match, to_of_node(dev->fwnode));
+ if (id)
+ plic_quirks = (unsigned long)id->data;
+ }
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
+ priv->dev = dev;
priv->plic_quirks = plic_quirks;
- priv->regs = of_iomap(node, 0);
+ priv->regs = of_iomap(to_of_node(dev->fwnode), 0);
if (WARN_ON(!priv->regs)) {
error = -EIO;
goto out_free_priv;
}
error = -EINVAL;
- of_property_read_u32(node, "riscv,ndev", &nr_irqs);
+ of_property_read_u32(to_of_node(dev->fwnode), "riscv,ndev", &nr_irqs);
if (WARN_ON(!nr_irqs))
goto out_iounmap;
@@ -439,13 +460,13 @@ static int __init __plic_init(struct device_node *node,
if (!priv->prio_save)
goto out_free_priority_reg;
- nr_contexts = of_irq_count(node);
+ nr_contexts = of_irq_count(to_of_node(dev->fwnode));
if (WARN_ON(!nr_contexts))
goto out_free_priority_reg;
error = -ENOMEM;
- priv->irqdomain = irq_domain_add_linear(node, nr_irqs + 1,
- &plic_irqdomain_ops, priv);
+ priv->irqdomain = irq_domain_add_linear(to_of_node(dev->fwnode), nr_irqs + 1,
+ &plic_irqdomain_ops, priv);
if (WARN_ON(!priv->irqdomain))
goto out_free_priority_reg;
@@ -455,7 +476,7 @@ static int __init __plic_init(struct device_node *node,
int cpu;
unsigned long hartid;
- if (of_irq_parse_one(node, i, &parent)) {
+ if (of_irq_parse_one(to_of_node(dev->fwnode), i, &parent)) {
pr_err("failed to parse parent for context %d.\n", i);
continue;
}
@@ -491,7 +512,7 @@ static int __init __plic_init(struct device_node *node,
/* Find parent domain and register chained handler */
if (!plic_parent_irq && irq_find_host(parent.np)) {
- plic_parent_irq = irq_of_parse_and_map(node, i);
+ plic_parent_irq = irq_of_parse_and_map(to_of_node(dev->fwnode), i);
if (plic_parent_irq)
irq_set_chained_handler(plic_parent_irq,
plic_handle_irq);
@@ -533,20 +554,29 @@ static int __init __plic_init(struct device_node *node,
/*
* We can have multiple PLIC instances so setup cpuhp state
- * and register syscore operations only when context handler
- * for current/boot CPU is present.
+ * and register syscore operations only once after context
+ * handlers of all online CPUs are initialized.
*/
- handler = this_cpu_ptr(&plic_handlers);
- if (handler->present && !plic_cpuhp_setup_done) {
- cpuhp_setup_state(CPUHP_AP_IRQ_SIFIVE_PLIC_STARTING,
- "irqchip/sifive/plic:starting",
- plic_starting_cpu, plic_dying_cpu);
- register_syscore_ops(&plic_irq_syscore_ops);
- plic_cpuhp_setup_done = true;
+ if (!plic_cpuhp_setup_done) {
+ cpuhp_setup = true;
+ for_each_online_cpu(cpu) {
+ handler = per_cpu_ptr(&plic_handlers, cpu);
+ if (!handler->present) {
+ cpuhp_setup = false;
+ break;
+ }
+ }
+ if (cpuhp_setup) {
+ cpuhp_setup_state(CPUHP_AP_IRQ_SIFIVE_PLIC_STARTING,
+ "irqchip/sifive/plic:starting",
+ plic_starting_cpu, plic_dying_cpu);
+ register_syscore_ops(&plic_irq_syscore_ops);
+ plic_cpuhp_setup_done = true;
+ }
}
- pr_info("%pOFP: mapped %d interrupts with %d handlers for"
- " %d contexts.\n", node, nr_irqs, nr_handlers, nr_contexts);
+ pr_info("%pOFP: mapped %d interrupts with %d handlers for %d contexts.\n",
+ to_of_node(dev->fwnode), nr_irqs, nr_handlers, nr_contexts);
return 0;
out_free_enable_reg:
@@ -563,20 +593,11 @@ static int __init __plic_init(struct device_node *node,
return error;
}
-static int __init plic_init(struct device_node *node,
- struct device_node *parent)
-{
- return __plic_init(node, parent, 0);
-}
-
-IRQCHIP_DECLARE(sifive_plic, "sifive,plic-1.0.0", plic_init);
-IRQCHIP_DECLARE(riscv_plic0, "riscv,plic0", plic_init); /* for legacy systems */
-
-static int __init plic_edge_init(struct device_node *node,
- struct device_node *parent)
-{
- return __plic_init(node, parent, BIT(PLIC_QUIRK_EDGE_INTERRUPT));
-}
-
-IRQCHIP_DECLARE(andestech_nceplic100, "andestech,nceplic100", plic_edge_init);
-IRQCHIP_DECLARE(thead_c900_plic, "thead,c900-plic", plic_edge_init);
+static struct platform_driver plic_driver = {
+ .driver = {
+ .name = "riscv-plic",
+ .of_match_table = plic_match,
+ },
+ .probe = plic_probe,
+};
+builtin_platform_driver(plic_driver);
--
2.34.1
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next prev parent reply other threads:[~2024-02-22 9:40 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-22 9:39 [PATCH v14 00/18] Linux RISC-V AIA Support Anup Patel
2024-02-22 9:39 ` Anup Patel [this message]
2024-04-03 8:29 ` [PATCH v14 01/18] irqchip/sifive-plic: Convert PLIC driver into a platform driver Lad, Prabhakar
2024-04-03 14:16 ` Anup Patel
2024-04-03 15:49 ` Lad, Prabhakar
2024-04-03 16:28 ` Samuel Holland
2024-04-03 18:10 ` Lad, Prabhakar
2024-04-03 16:42 ` Anup Patel
2024-04-03 17:19 ` Anup Patel
2024-02-22 9:39 ` [PATCH v14 02/18] irqchip/sifive-plic: Use dev_xyz() in-place of pr_xyz() Anup Patel
2024-02-22 9:39 ` [PATCH v14 03/18] irqchip/sifive-plic: Use devm_xyz() for managed allocation Anup Patel
2024-02-22 9:39 ` [PATCH v14 04/18] irqchip/sifive-plic: Use riscv_get_intc_hwnode() to get parent fwnode Anup Patel
2024-02-22 9:39 ` [PATCH v14 05/18] irqchip/sifive-plic: Cleanup PLIC contexts upon irqdomain creation failure Anup Patel
2024-02-22 9:39 ` [PATCH v14 06/18] irqchip/sifive-plic: Parse number of irqs and contexts early in plic_probe Anup Patel
2024-02-22 9:39 ` [PATCH v14 07/18] irqchip/sifive-plic: Improve locking safety by using irqsave/irqrestore Anup Patel
2024-02-22 9:39 ` [PATCH v14 08/18] irqchip/riscv-intc: Add support for RISC-V AIA Anup Patel
2024-02-22 9:39 ` [PATCH v14 09/18] dt-bindings: interrupt-controller: Add RISC-V incoming MSI controller Anup Patel
2024-02-22 9:39 ` [PATCH v14 10/18] genirq/matrix: Dynamic bitmap allocation Anup Patel
2024-02-22 9:39 ` [PATCH v14 11/18] irqchip: Add RISC-V incoming MSI controller early driver Anup Patel
2024-02-22 13:13 ` Björn Töpel
2024-02-22 13:42 ` Anup Patel
2024-02-22 14:15 ` Björn Töpel
2024-02-23 8:28 ` Thomas Gleixner
2024-02-23 9:52 ` Anup Patel
2024-02-22 9:40 ` [PATCH v14 12/18] irqchip/riscv-imsic: Add device MSI domain support for platform devices Anup Patel
2024-02-22 13:15 ` Björn Töpel
2024-02-22 13:44 ` Anup Patel
2024-02-22 9:40 ` [PATCH v14 13/18] irqchip/riscv-imsic: Add device MSI domain support for PCI devices Anup Patel
2024-02-22 13:14 ` Björn Töpel
2024-02-22 13:30 ` Anup Patel
2024-02-22 14:05 ` Björn Töpel
2024-02-22 9:40 ` [PATCH v14 14/18] dt-bindings: interrupt-controller: Add RISC-V advanced PLIC Anup Patel
2024-02-22 9:40 ` [PATCH v14 15/18] irqchip: Add RISC-V advanced PLIC driver for direct-mode Anup Patel
2024-02-22 9:40 ` [PATCH v14 16/18] irqchip/riscv-aplic: Add support for MSI-mode Anup Patel
2024-02-22 9:40 ` [PATCH v14 17/18] RISC-V: Select APLIC and IMSIC drivers Anup Patel
2024-02-22 9:40 ` [PATCH v14 18/18] MAINTAINERS: Add entry for RISC-V AIA drivers Anup Patel
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