linux-kernel - [PATCH v3 5/6] irqchip: sifive-plic: Differentiate between PLIC handler and context

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Message-Id: <20181130080207.20505-6-anup@brainfault.org>
Date:   Fri, 30 Nov 2018 13:32:06 +0530
From:   Anup Patel <anup@...infault.org>
To:     Palmer Dabbelt <palmer@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <marc.zyngier@....com>
Cc:     Atish Patra <atish.patra@....com>,
        Christoph Hellwig <hch@...radead.org>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Anup Patel <anup@...infault.org>
Subject: [PATCH v3 5/6] irqchip: sifive-plic: Differentiate between PLIC handler and context

We explicitly differentiate between PLIC handler and context because
PLIC context is for given mode of HART whereas PLIC handler is per-CPU
software construct meant for handling interrupts from a particular
PLIC context.

To achieve this differentiation, we rename "nr_handlers" to "nr_contexts"
and "nr_mapped" to "nr_handlers" in struct plic_hw.

Signed-off-by: Anup Patel <anup@...infault.org>
---
 drivers/irqchip/irq-sifive-plic.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/irqchip/irq-sifive-plic.c b/drivers/irqchip/irq-sifive-plic.c
index 3d4f205f8abe..17269622be21 100644
--- a/drivers/irqchip/irq-sifive-plic.c
+++ b/drivers/irqchip/irq-sifive-plic.c
@@ -70,8 +70,8 @@ static DEFINE_PER_CPU(struct plic_handler, plic_handlers);
 
 struct plic_hw {
 	u32			nr_irqs;
+	u32			nr_contexts;
 	u32			nr_handlers;
-	u32			nr_mapped;
 	void __iomem		*regs;
 	struct irq_domain	*irqdomain;
 };
@@ -199,10 +199,10 @@ static int __init plic_init(struct device_node *node,
 	if (WARN_ON(!plic.nr_irqs))
 		goto out_iounmap;
 
-	plic.nr_handlers = of_irq_count(node);
-	if (WARN_ON(!plic.nr_handlers))
+	plic.nr_contexts = of_irq_count(node);
+	if (WARN_ON(!plic.nr_contexts))
 		goto out_iounmap;
-	if (WARN_ON(plic.nr_handlers < num_possible_cpus()))
+	if (WARN_ON(plic.nr_contexts < num_possible_cpus()))
 		goto out_iounmap;
 
 	error = -ENOMEM;
@@ -211,7 +211,7 @@ static int __init plic_init(struct device_node *node,
 	if (WARN_ON(!plic.irqdomain))
 		goto out_iounmap;
 
-	for (i = 0; i < plic.nr_handlers; i++) {
+	for (i = 0; i < plic.nr_contexts; i++) {
 		struct of_phandle_args parent;
 		struct plic_handler *handler;
 		irq_hw_number_t hwirq;
@@ -251,11 +251,11 @@ static int __init plic_init(struct device_node *node,
 		for (hwirq = 1; hwirq <= plic.nr_irqs; hwirq++)
 			plic_toggle(handler, hwirq, 0);
 
-		plic.nr_mapped++;
+		plic.nr_handlers++;
 	}
 
-	pr_info("mapped %d interrupts to %d (out of %d) handlers.\n",
-		plic.nr_irqs, plic.nr_mapped, plic.nr_handlers);
+	pr_info("mapped %d interrupts with %d handlers for %d contexts.\n",
+		plic.nr_irqs, plic.nr_handlers, plic.nr_contexts);
 	set_handle_irq(plic_handle_irq);
 	return 0;
 
-- 
2.17.1