Re: [PATCH v8 02/16] RISC-V: Add riscv_get_intc_hartid() function

Anup Patel
2023-09-26T12:27:59Z

On Mon, Sep 25, 2023 at 1:08 PM Sunil V L <sunilvl@ventanamicro.com> wrote:
>
> Hi Anup,
>
> On Tue, Sep 12, 2023 at 11:19:14PM +0530, Anup Patel wrote:
> > 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().
> >
> > Signed-off-by: Anup Patel <apatel@ventanamicro.com>
> > ---
> > arch/riscv/include/asm/processor.h | 4 +++-
> > arch/riscv/kernel/cpu.c | 13 ++++++++++++-
> > drivers/irqchip/irq-riscv-intc.c | 2 +-
> > drivers/irqchip/irq-sifive-plic.c | 3 ++-
> > 4 files changed, 18 insertions(+), 4 deletions(-)
> >
> > diff --git a/arch/riscv/include/asm/processor.h b/arch/riscv/include/asm/processor.h
> > index 3e23e1786d05..3ce64b3bea4e 100644
> > --- a/arch/riscv/include/asm/processor.h
> > +++ b/arch/riscv/include/asm/processor.h
> > @@ -119,7 +119,9 @@ 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 157ace8b262c..ee583eac3c5b 100644
> > --- a/arch/riscv/kernel/cpu.c
> > +++ b/arch/riscv/kernel/cpu.c
> > @@ -123,7 +123,8 @@ int __init riscv_early_of_processor_hartid(struct device_node *node, unsigned lo
> > * 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)
> > {
> > for (; node; node = node->parent) {
> > if (of_device_is_compatible(node, "riscv")) {
> > @@ -139,6 +140,16 @@ int riscv_of_parent_hartid(struct device_node *node, unsigned long *hartid)
> > return -1;
> > }
> >
> > +/* Find hart ID of the INTC fwnode. */
> > +int riscv_get_intc_hartid(struct fwnode_handle *node, unsigned long *hartid)
> > +{
> > + /* Extend this function ACPI in the future. */
>
> As per Marc's feedback, we can't use swnode for ACPI irchips. So, there
> is no need to create this wrapper function and this patch can be
> dropped.

Okay, I will drop this patch.

Regards,
Anup

>
> Thanks,
> Sunil
>
> > + if (!is_of_node(node))
> > + return -ENODEV;
> > +
> > + return riscv_of_parent_hartid(to_of_node(node), hartid);
> > +}
> > +
> > 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
> >