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Message-Id: <20230802150018.327079-2-apatel@ventanamicro.com>
Date: Wed, 2 Aug 2023 20:30:04 +0530
From: Anup Patel <apatel@...tanamicro.com>
To: Palmer Dabbelt <palmer@...belt.com>,
Paul Walmsley <paul.walmsley@...ive.com>,
Thomas Gleixner <tglx@...utronix.de>,
Marc Zyngier <maz@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Frank Rowand <frowand.list@...il.com>,
Conor Dooley <conor+dt@...nel.org>
Cc: Atish Patra <atishp@...shpatra.org>,
Andrew Jones <ajones@...tanamicro.com>,
Sunil V L <sunilvl@...tanamicro.com>,
Saravana Kannan <saravanak@...gle.com>,
Anup Patel <anup@...infault.org>,
linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org, Anup Patel <apatel@...tanamicro.com>
Subject: [PATCH v7 01/15] RISC-V: Add riscv_get_intc_hartid() function
We add a common riscv_get_intc_hartid() which help device drivers to
get hartid of the HART associated with a INTC (i.e. local interrupt
controller) fwnode. This new function is more generic compared to
the existing riscv_of_parent_hartid() function hence we also replace
use of riscv_of_parent_hartid() with riscv_get_intc_hartid().
Also, while we are here let us update riscv_of_parent_hartid() to
always return the hartid irrespective whether the CPU/HART DT node
is disabled or not.
Signed-off-by: Anup Patel <apatel@...tanamicro.com>
---
arch/riscv/include/asm/processor.h | 4 +++-
arch/riscv/kernel/cpu.c | 26 ++++++++++++++++++++------
drivers/irqchip/irq-riscv-intc.c | 2 +-
drivers/irqchip/irq-sifive-plic.c | 3 ++-
4 files changed, 26 insertions(+), 9 deletions(-)
diff --git a/arch/riscv/include/asm/processor.h b/arch/riscv/include/asm/processor.h
index c950a8d9edef..662da1e112dd 100644
--- a/arch/riscv/include/asm/processor.h
+++ b/arch/riscv/include/asm/processor.h
@@ -79,7 +79,9 @@ static inline void wait_for_interrupt(void)
struct device_node;
int riscv_of_processor_hartid(struct device_node *node, unsigned long *hartid);
int riscv_early_of_processor_hartid(struct device_node *node, unsigned long *hartid);
-int riscv_of_parent_hartid(struct device_node *node, unsigned long *hartid);
+
+struct fwnode_handle;
+int riscv_get_intc_hartid(struct fwnode_handle *node, unsigned long *hartid);
extern void riscv_fill_hwcap(void);
extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
diff --git a/arch/riscv/kernel/cpu.c b/arch/riscv/kernel/cpu.c
index a2fc952318e9..c3eaa8a55bbe 100644
--- a/arch/riscv/kernel/cpu.c
+++ b/arch/riscv/kernel/cpu.c
@@ -81,21 +81,35 @@ int riscv_early_of_processor_hartid(struct device_node *node, unsigned long *har
* To achieve this, we walk up the DT tree until we find an active
* RISC-V core (HART) node and extract the cpuid from it.
*/
-int riscv_of_parent_hartid(struct device_node *node, unsigned long *hartid)
+static int riscv_of_parent_hartid(struct device_node *node,
+ unsigned long *hartid)
{
- int rc;
-
for (; node; node = node->parent) {
if (of_device_is_compatible(node, "riscv")) {
- rc = riscv_of_processor_hartid(node, hartid);
- if (!rc)
- return 0;
+ *hartid = (unsigned long)of_get_cpu_hwid(node, 0);
+ return 0;
}
}
return -1;
}
+/* Find hart ID of the INTC fwnode. */
+int riscv_get_intc_hartid(struct fwnode_handle *node, unsigned long *hartid)
+{
+ int rc;
+ u64 temp;
+
+ if (!is_of_node(node)) {
+ rc = fwnode_property_read_u64_array(node, "hartid", &temp, 1);
+ if (!rc)
+ *hartid = temp;
+ } else
+ rc = riscv_of_parent_hartid(to_of_node(node), hartid);
+
+ return rc;
+}
+
DEFINE_PER_CPU(struct riscv_cpuinfo, riscv_cpuinfo);
unsigned long riscv_cached_mvendorid(unsigned int cpu_id)
diff --git a/drivers/irqchip/irq-riscv-intc.c b/drivers/irqchip/irq-riscv-intc.c
index 4adeee1bc391..65f4a2afb381 100644
--- a/drivers/irqchip/irq-riscv-intc.c
+++ b/drivers/irqchip/irq-riscv-intc.c
@@ -143,7 +143,7 @@ static int __init riscv_intc_init(struct device_node *node,
int rc;
unsigned long hartid;
- rc = riscv_of_parent_hartid(node, &hartid);
+ rc = riscv_get_intc_hartid(of_fwnode_handle(node), &hartid);
if (rc < 0) {
pr_warn("unable to find hart id for %pOF\n", node);
return 0;
diff --git a/drivers/irqchip/irq-sifive-plic.c b/drivers/irqchip/irq-sifive-plic.c
index e1484905b7bd..56b0544b1f27 100644
--- a/drivers/irqchip/irq-sifive-plic.c
+++ b/drivers/irqchip/irq-sifive-plic.c
@@ -477,7 +477,8 @@ static int __init __plic_init(struct device_node *node,
continue;
}
- error = riscv_of_parent_hartid(parent.np, &hartid);
+ error = riscv_get_intc_hartid(of_fwnode_handle(parent.np),
+ &hartid);
if (error < 0) {
pr_warn("failed to parse hart ID for context %d.\n", i);
continue;
--
2.34.1
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