| Message ID | 20230216182043.1946553-13-sunilvl@ventanamicro.com |
|---|---|
| State | New |
| Headers | show |
| Series | Add basic ACPI support for RISC-V | expand |
On Thu, Feb 16, 2023 at 11:50:34PM +0530, Sunil V L wrote: > On ACPI based systems, the information about the hart > like ISA is provided by the RISC-V Hart Capabilities Table (RHCT). > Enable filling up hwcap structure based on the information in RHCT. > > Signed-off-by: Sunil V L <sunilvl@ventanamicro.com> > Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > --- > arch/riscv/kernel/cpufeature.c | 41 ++++++++++++++++++++++++++++------ > 1 file changed, 34 insertions(+), 7 deletions(-) > > diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c > index 93e45560af30..cb67d3fcbb56 100644 > --- a/arch/riscv/kernel/cpufeature.c > +++ b/arch/riscv/kernel/cpufeature.c > @@ -6,12 +6,15 @@ > * Copyright (C) 2017 SiFive > */ > > +#include <linux/acpi.h> > #include <linux/bitmap.h> > #include <linux/ctype.h> > #include <linux/libfdt.h> > #include <linux/log2.h> > #include <linux/module.h> > #include <linux/of.h> > +#include <linux/of_device.h> > +#include <asm/acpi.h> > #include <asm/alternative.h> > #include <asm/cacheflush.h> > #include <asm/errata_list.h> > @@ -93,7 +96,10 @@ void __init riscv_fill_hwcap(void) > char print_str[NUM_ALPHA_EXTS + 1]; > int i, j, rc; > unsigned long isa2hwcap[26] = {0}; > + struct acpi_table_header *rhct; > + acpi_status status; > unsigned long hartid; > + unsigned int cpu; > > isa2hwcap['i' - 'a'] = COMPAT_HWCAP_ISA_I; > isa2hwcap['m' - 'a'] = COMPAT_HWCAP_ISA_M; > @@ -106,18 +112,36 @@ void __init riscv_fill_hwcap(void) > > bitmap_zero(riscv_isa, RISCV_ISA_EXT_MAX); > > - for_each_of_cpu_node(node) { > + if (!acpi_disabled) { > + status = acpi_get_table(ACPI_SIG_RHCT, 0, &rhct); > + if (ACPI_FAILURE(status)) > + return; > + } > + > + for_each_possible_cpu(cpu) { > unsigned long this_hwcap = 0; > DECLARE_BITMAP(this_isa, RISCV_ISA_EXT_MAX); > const char *temp; > > - rc = riscv_of_processor_hartid(node, &hartid); > - if (rc < 0) > - continue; > + if (acpi_disabled) { > + node = of_cpu_device_node_get(cpu); > + if (node) { > + rc = riscv_of_processor_hartid(node, &hartid); > + if (rc < 0) > + continue; This 'continue' and the one below need of_node_put() calls. Or, restructure to ensure that the one of_node_put() call added below is always called. > > - if (of_property_read_string(node, "riscv,isa", &isa)) { > - pr_warn("Unable to find \"riscv,isa\" devicetree entry\n"); > - continue; > + if (of_property_read_string(node, "riscv,isa", &isa)) { > + pr_warn("Unable to find \"riscv,isa\" devicetree entry\n"); > + continue; > + } > + of_node_put(node); > + } > + } else { > + rc = acpi_get_riscv_isa(rhct, get_acpi_id_for_cpu(cpu), &isa); > + if (rc < 0) { > + pr_warn("Unable to get ISA for the hart - %d\n", cpu); > + continue; > + } > } > > temp = isa; > @@ -248,6 +272,9 @@ void __init riscv_fill_hwcap(void) > bitmap_and(riscv_isa, riscv_isa, this_isa, RISCV_ISA_EXT_MAX); > } > > + if (!acpi_disabled) > + acpi_put_table((struct acpi_table_header *)rhct); > + > /* We don't support systems with F but without D, so mask those out > * here. */ > if ((elf_hwcap & COMPAT_HWCAP_ISA_F) && !(elf_hwcap & COMPAT_HWCAP_ISA_D)) { > -- > 2.34.1 > Thanks, drew
diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c index 93e45560af30..cb67d3fcbb56 100644 --- a/arch/riscv/kernel/cpufeature.c +++ b/arch/riscv/kernel/cpufeature.c @@ -6,12 +6,15 @@ * Copyright (C) 2017 SiFive */ +#include <linux/acpi.h> #include <linux/bitmap.h> #include <linux/ctype.h> #include <linux/libfdt.h> #include <linux/log2.h> #include <linux/module.h> #include <linux/of.h> +#include <linux/of_device.h> +#include <asm/acpi.h> #include <asm/alternative.h> #include <asm/cacheflush.h> #include <asm/errata_list.h> @@ -93,7 +96,10 @@ void __init riscv_fill_hwcap(void) char print_str[NUM_ALPHA_EXTS + 1]; int i, j, rc; unsigned long isa2hwcap[26] = {0}; + struct acpi_table_header *rhct; + acpi_status status; unsigned long hartid; + unsigned int cpu; isa2hwcap['i' - 'a'] = COMPAT_HWCAP_ISA_I; isa2hwcap['m' - 'a'] = COMPAT_HWCAP_ISA_M; @@ -106,18 +112,36 @@ void __init riscv_fill_hwcap(void) bitmap_zero(riscv_isa, RISCV_ISA_EXT_MAX); - for_each_of_cpu_node(node) { + if (!acpi_disabled) { + status = acpi_get_table(ACPI_SIG_RHCT, 0, &rhct); + if (ACPI_FAILURE(status)) + return; + } + + for_each_possible_cpu(cpu) { unsigned long this_hwcap = 0; DECLARE_BITMAP(this_isa, RISCV_ISA_EXT_MAX); const char *temp; - rc = riscv_of_processor_hartid(node, &hartid); - if (rc < 0) - continue; + if (acpi_disabled) { + node = of_cpu_device_node_get(cpu); + if (node) { + rc = riscv_of_processor_hartid(node, &hartid); + if (rc < 0) + continue; - if (of_property_read_string(node, "riscv,isa", &isa)) { - pr_warn("Unable to find \"riscv,isa\" devicetree entry\n"); - continue; + if (of_property_read_string(node, "riscv,isa", &isa)) { + pr_warn("Unable to find \"riscv,isa\" devicetree entry\n"); + continue; + } + of_node_put(node); + } + } else { + rc = acpi_get_riscv_isa(rhct, get_acpi_id_for_cpu(cpu), &isa); + if (rc < 0) { + pr_warn("Unable to get ISA for the hart - %d\n", cpu); + continue; + } } temp = isa; @@ -248,6 +272,9 @@ void __init riscv_fill_hwcap(void) bitmap_and(riscv_isa, riscv_isa, this_isa, RISCV_ISA_EXT_MAX); } + if (!acpi_disabled) + acpi_put_table((struct acpi_table_header *)rhct); + /* We don't support systems with F but without D, so mask those out * here. */ if ((elf_hwcap & COMPAT_HWCAP_ISA_F) && !(elf_hwcap & COMPAT_HWCAP_ISA_D)) {