[PATCH V2 4/5] riscv: cpu: Support for 64bit hartid

Sunil V L sunilvl at ventanamicro.com
Thu May 26 21:30:55 PDT 2022


On Thu, May 26, 2022 at 04:10:51PM -0700, Atish Patra wrote:
> On Thu, May 26, 2022 at 3:12 AM Sunil V L <sunilvl at ventanamicro.com> wrote:
> >
> > Adds support for 64bit hartid in riscv_of_processor_hartid()
> 
> The commit text is a bit misleading as you are adding support for XLEN
> hartid. For RV32, it is still 32bit.
> This applies to the entire series.

Thanks Atish. I somehow missed mentioning RV64 in this patch. Will
update and send.

Thanks
Sunil
> 
> >   - Separate return value and status code.
> >   - Make hartid variable type as unsigned long.
> >   - Update the callers.
> >
> > Signed-off-by: Sunil V L <sunilvl at ventanamicro.com>
> > ---
> >  arch/riscv/include/asm/processor.h |  4 ++--
> >  arch/riscv/kernel/cpu.c            | 26 +++++++++++++++-----------
> >  arch/riscv/kernel/cpufeature.c     |  6 ++++--
> >  arch/riscv/kernel/smpboot.c        |  9 +++++----
> >  drivers/clocksource/timer-riscv.c  | 15 ++++++++-------
> >  drivers/irqchip/irq-riscv-intc.c   |  7 ++++---
> >  drivers/irqchip/irq-sifive-plic.c  |  7 ++++---
> >  7 files changed, 42 insertions(+), 32 deletions(-)
> >
> > diff --git a/arch/riscv/include/asm/processor.h b/arch/riscv/include/asm/processor.h
> > index 0749924d9e55..99fae9398506 100644
> > --- a/arch/riscv/include/asm/processor.h
> > +++ b/arch/riscv/include/asm/processor.h
> > @@ -75,8 +75,8 @@ static inline void wait_for_interrupt(void)
> >  }
> >
> >  struct device_node;
> > -int riscv_of_processor_hartid(struct device_node *node);
> > -int riscv_of_parent_hartid(struct device_node *node);
> > +int riscv_of_processor_hartid(struct device_node *node, unsigned long *hartid);
> > +int riscv_of_parent_hartid(struct device_node *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 ccb617791e56..477a33b34c95 100644
> > --- a/arch/riscv/kernel/cpu.c
> > +++ b/arch/riscv/kernel/cpu.c
> > @@ -14,37 +14,36 @@
> >   * Returns the hart ID of the given device tree node, or -ENODEV if the node
> >   * isn't an enabled and valid RISC-V hart node.
> >   */
> > -int riscv_of_processor_hartid(struct device_node *node)
> > +int riscv_of_processor_hartid(struct device_node *node, unsigned long *hart)
> >  {
> >         const char *isa;
> > -       u32 hart;
> >
> >         if (!of_device_is_compatible(node, "riscv")) {
> >                 pr_warn("Found incompatible CPU\n");
> >                 return -ENODEV;
> >         }
> >
> > -       hart = of_get_cpu_hwid(node, 0);
> > -       if (hart == ~0U) {
> > +       *hart = (unsigned long) of_get_cpu_hwid(node, 0);
> > +       if (*hart == ~0UL) {
> >                 pr_warn("Found CPU without hart ID\n");
> >                 return -ENODEV;
> >         }
> >
> >         if (!of_device_is_available(node)) {
> > -               pr_info("CPU with hartid=%d is not available\n", hart);
> > +               pr_info("CPU with hartid=%lu is not available\n", *hart);
> >                 return -ENODEV;
> >         }
> >
> >         if (of_property_read_string(node, "riscv,isa", &isa)) {
> > -               pr_warn("CPU with hartid=%d has no \"riscv,isa\" property\n", hart);
> > +               pr_warn("CPU with hartid=%lu has no \"riscv,isa\" property\n", *hart);
> >                 return -ENODEV;
> >         }
> >         if (isa[0] != 'r' || isa[1] != 'v') {
> > -               pr_warn("CPU with hartid=%d has an invalid ISA of \"%s\"\n", hart, isa);
> > +               pr_warn("CPU with hartid=%lu has an invalid ISA of \"%s\"\n", *hart, isa);
> >                 return -ENODEV;
> >         }
> >
> > -       return hart;
> > +       return 0;
> >  }
> >
> >  /*
> > @@ -53,11 +52,16 @@ int riscv_of_processor_hartid(struct device_node *node)
> >   * 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)
> > +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"))
> > -                       return riscv_of_processor_hartid(node);
> > +               if (of_device_is_compatible(node, "riscv")) {
> > +                       rc = riscv_of_processor_hartid(node, hartid);
> > +                       if (!rc)
> > +                               return 0;
> > +               }
> >         }
> >
> >         return -1;
> > diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
> > index 1b2d42d7f589..49c05bd9352d 100644
> > --- a/arch/riscv/kernel/cpufeature.c
> > +++ b/arch/riscv/kernel/cpufeature.c
> > @@ -67,8 +67,9 @@ void __init riscv_fill_hwcap(void)
> >         struct device_node *node;
> >         const char *isa;
> >         char print_str[NUM_ALPHA_EXTS + 1];
> > -       int i, j;
> > +       int i, j, rc;
> >         static unsigned long isa2hwcap[256] = {0};
> > +       unsigned long hartid;
> >
> >         isa2hwcap['i'] = isa2hwcap['I'] = COMPAT_HWCAP_ISA_I;
> >         isa2hwcap['m'] = isa2hwcap['M'] = COMPAT_HWCAP_ISA_M;
> > @@ -86,7 +87,8 @@ void __init riscv_fill_hwcap(void)
> >                 DECLARE_BITMAP(this_isa, RISCV_ISA_EXT_MAX);
> >                 const char *temp;
> >
> > -               if (riscv_of_processor_hartid(node) < 0)
> > +               rc = riscv_of_processor_hartid(node, &hartid);
> > +               if (rc < 0)
> >                         continue;
> >
> >                 if (of_property_read_string(node, "riscv,isa", &isa)) {
> > diff --git a/arch/riscv/kernel/smpboot.c b/arch/riscv/kernel/smpboot.c
> > index 622f226454d5..4336610a19ee 100644
> > --- a/arch/riscv/kernel/smpboot.c
> > +++ b/arch/riscv/kernel/smpboot.c
> > @@ -76,15 +76,16 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
> >  void __init setup_smp(void)
> >  {
> >         struct device_node *dn;
> > -       int hart;
> > +       unsigned long hart;
> >         bool found_boot_cpu = false;
> >         int cpuid = 1;
> > +       int rc;
> >
> >         cpu_set_ops(0);
> >
> >         for_each_of_cpu_node(dn) {
> > -               hart = riscv_of_processor_hartid(dn);
> > -               if (hart < 0)
> > +               rc = riscv_of_processor_hartid(dn, &hart);
> > +               if (rc < 0)
> >                         continue;
> >
> >                 if (hart == cpuid_to_hartid_map(0)) {
> > @@ -94,7 +95,7 @@ void __init setup_smp(void)
> >                         continue;
> >                 }
> >                 if (cpuid >= NR_CPUS) {
> > -                       pr_warn("Invalid cpuid [%d] for hartid [%d]\n",
> > +                       pr_warn("Invalid cpuid [%d] for hartid [%lu]\n",
> >                                 cpuid, hart);
> >                         continue;
> >                 }
> > diff --git a/drivers/clocksource/timer-riscv.c b/drivers/clocksource/timer-riscv.c
> > index 1767f8bf2013..55142c27f0bc 100644
> > --- a/drivers/clocksource/timer-riscv.c
> > +++ b/drivers/clocksource/timer-riscv.c
> > @@ -101,20 +101,21 @@ static irqreturn_t riscv_timer_interrupt(int irq, void *dev_id)
> >
> >  static int __init riscv_timer_init_dt(struct device_node *n)
> >  {
> > -       int cpuid, hartid, error;
> > +       int cpuid, error;
> > +       unsigned long hartid;
> >         struct device_node *child;
> >         struct irq_domain *domain;
> >
> > -       hartid = riscv_of_processor_hartid(n);
> > -       if (hartid < 0) {
> > -               pr_warn("Not valid hartid for node [%pOF] error = [%d]\n",
> > +       error = riscv_of_processor_hartid(n, &hartid);
> > +       if (error < 0) {
> > +               pr_warn("Not valid hartid for node [%pOF] error = [%lu]\n",
> >                         n, hartid);
> > -               return hartid;
> > +               return error;
> >         }
> >
> >         cpuid = riscv_hartid_to_cpuid(hartid);
> >         if (cpuid < 0) {
> > -               pr_warn("Invalid cpuid for hartid [%d]\n", hartid);
> > +               pr_warn("Invalid cpuid for hartid [%lu]\n", hartid);
> >                 return cpuid;
> >         }
> >
> > @@ -140,7 +141,7 @@ static int __init riscv_timer_init_dt(struct device_node *n)
> >                 return -ENODEV;
> >         }
> >
> > -       pr_info("%s: Registering clocksource cpuid [%d] hartid [%d]\n",
> > +       pr_info("%s: Registering clocksource cpuid [%d] hartid [%lu]\n",
> >                __func__, cpuid, hartid);
> >         error = clocksource_register_hz(&riscv_clocksource, riscv_timebase);
> >         if (error) {
> > diff --git a/drivers/irqchip/irq-riscv-intc.c b/drivers/irqchip/irq-riscv-intc.c
> > index b65bd8878d4f..499e5f81b3fe 100644
> > --- a/drivers/irqchip/irq-riscv-intc.c
> > +++ b/drivers/irqchip/irq-riscv-intc.c
> > @@ -95,10 +95,11 @@ static const struct irq_domain_ops riscv_intc_domain_ops = {
> >  static int __init riscv_intc_init(struct device_node *node,
> >                                   struct device_node *parent)
> >  {
> > -       int rc, hartid;
> > +       int rc;
> > +       unsigned long hartid;
> >
> > -       hartid = riscv_of_parent_hartid(node);
> > -       if (hartid < 0) {
> > +       rc = riscv_of_parent_hartid(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 bb87e4c3b88e..4710d9741f36 100644
> > --- a/drivers/irqchip/irq-sifive-plic.c
> > +++ b/drivers/irqchip/irq-sifive-plic.c
> > @@ -317,7 +317,8 @@ static int __init plic_init(struct device_node *node,
> >         for (i = 0; i < nr_contexts; i++) {
> >                 struct of_phandle_args parent;
> >                 irq_hw_number_t hwirq;
> > -               int cpu, hartid;
> > +               int cpu;
> > +               unsigned long hartid;
> >
> >                 if (of_irq_parse_one(node, i, &parent)) {
> >                         pr_err("failed to parse parent for context %d.\n", i);
> > @@ -341,8 +342,8 @@ static int __init plic_init(struct device_node *node,
> >                         continue;
> >                 }
> >
> > -               hartid = riscv_of_parent_hartid(parent.np);
> > -               if (hartid < 0) {
> > +               error = riscv_of_parent_hartid(parent.np, &hartid);
> > +               if (error < 0) {
> >                         pr_warn("failed to parse hart ID for context %d.\n", i);
> >                         continue;
> >                 }
> > --
> > 2.25.1
> >
> 
> Otherwise, it looks good.
> 
> Reviewed-by: Atish Patra <atishp at rivosinc.com>
> 
> -- 
> Regards,
> Atish



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