Hey Sunil, On Mon, May 08, 2023 at 05:22:24PM +0530, Sunil V L wrote: > RINTC structures in the MADT provide mapping between the hartid > and the CPU. This is required many times even at run time like > cpuinfo. So, instead of parsing the ACPI table every time, cache > the RINTC structures and provide a function to get the correct > RINTC structure for a given cpu. > > Signed-off-by: Sunil V L <sunilvl@xxxxxxxxxxxxxxxx> > Acked-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> From this patch until "RISC-V: Add ACPI initialization in setup_arch()" (which is 19/21), the series fails to build. allmodconfig, clang-16: ../arch/riscv/include/asm/acpi.h:22:23: error: unknown type name 'acpi_physical_address'; did you mean 'efi_physical_addr_t'? ../arch/riscv/include/asm/acpi.h:22:51: error: unknown type name 'acpi_size' rv32_defconfig, clang-16: arch/riscv/kernel/setup.c:297:7: error: use of undeclared identifier 'acpi_disabled'; did you mean '__cpu_disable'? arch/riscv/kernel/setup.c:297:7: warning: address of function '__cpu_disable' will always evaluate to 'true' [-Wpointer-bool-conversion] I ballsed up a toolchain upgrade to gcc-13, so the whole series is showing build issues on patchwork for the gcc configurations: https://patchwork.kernel.org/project/linux-riscv/list/?series=745787 However, I suspect that the same patches that fail for clang-16 will fail for gcc-13 too, once I have fixed that! Cheers, Conor. > --- > arch/riscv/include/asm/acpi.h | 10 ++++++++ > arch/riscv/kernel/acpi.c | 45 +++++++++++++++++++++++++++++++++++ > arch/riscv/kernel/setup.c | 4 ++++ > 3 files changed, 59 insertions(+) > > diff --git a/arch/riscv/include/asm/acpi.h b/arch/riscv/include/asm/acpi.h > index 9be52b6ffae1..6519529c8bdf 100644 > --- a/arch/riscv/include/asm/acpi.h > +++ b/arch/riscv/include/asm/acpi.h > @@ -59,6 +59,16 @@ static inline bool acpi_has_cpu_in_madt(void) > > static inline void arch_fix_phys_package_id(int num, u32 slot) { } > > +void acpi_init_rintc_map(void); > +struct acpi_madt_rintc *acpi_cpu_get_madt_rintc(int cpu); > +u32 get_acpi_id_for_cpu(int cpu); > +#else > +static inline void acpi_init_rintc_map(void) { } > +static inline struct acpi_madt_rintc *acpi_cpu_get_madt_rintc(int cpu) > +{ > + return NULL; > +} > + > #endif /* CONFIG_ACPI */ > > #endif /*_ASM_ACPI_H*/ > diff --git a/arch/riscv/kernel/acpi.c b/arch/riscv/kernel/acpi.c > index 81d448c41714..89e142611c84 100644 > --- a/arch/riscv/kernel/acpi.c > +++ b/arch/riscv/kernel/acpi.c > @@ -24,6 +24,51 @@ EXPORT_SYMBOL(acpi_disabled); > int acpi_pci_disabled = 1; /* skip ACPI PCI scan and IRQ initialization */ > EXPORT_SYMBOL(acpi_pci_disabled); > > +static struct acpi_madt_rintc cpu_madt_rintc[NR_CPUS]; > + > +static int acpi_parse_madt_rintc(union acpi_subtable_headers *header, const unsigned long end) > +{ > + struct acpi_madt_rintc *rintc = (struct acpi_madt_rintc *)header; > + int cpuid; > + > + if (!(rintc->flags & ACPI_MADT_ENABLED)) > + return 0; > + > + cpuid = riscv_hartid_to_cpuid(rintc->hart_id); > + /* > + * When CONFIG_SMP is disabled, mapping won't be created for > + * all cpus. > + * CPUs more than num_possible_cpus, will be ignored. > + */ > + if (cpuid >= 0 && cpuid < num_possible_cpus()) > + cpu_madt_rintc[cpuid] = *rintc; > + > + return 0; > +} > + > +/* > + * Instead of parsing (and freeing) the ACPI table, cache > + * the RINTC structures since they are frequently used > + * like in cpuinfo. > + */ > +void __init acpi_init_rintc_map(void) > +{ > + if (acpi_table_parse_madt(ACPI_MADT_TYPE_RINTC, acpi_parse_madt_rintc, 0) <= 0) { > + pr_err("No valid RINTC entries exist\n"); > + BUG(); > + } > +} > + > +struct acpi_madt_rintc *acpi_cpu_get_madt_rintc(int cpu) > +{ > + return &cpu_madt_rintc[cpu]; > +} > + > +u32 get_acpi_id_for_cpu(int cpu) > +{ > + return acpi_cpu_get_madt_rintc(cpu)->uid; > +} > + > /* > * __acpi_map_table() will be called before paging_init(), so early_ioremap() > * or early_memremap() should be called here to for ACPI table mapping. > diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c > index 9fb839074e16..a44c7fcde12f 100644 > --- a/arch/riscv/kernel/setup.c > +++ b/arch/riscv/kernel/setup.c > @@ -21,6 +21,7 @@ > #include <linux/efi.h> > #include <linux/crash_dump.h> > > +#include <asm/acpi.h> > #include <asm/alternative.h> > #include <asm/cacheflush.h> > #include <asm/cpu_ops.h> > @@ -293,6 +294,9 @@ void __init setup_arch(char **cmdline_p) > setup_smp(); > #endif > > + if (!acpi_disabled) > + acpi_init_rintc_map(); > + > riscv_init_cbo_blocksizes(); > riscv_fill_hwcap(); > apply_boot_alternatives(); > -- > 2.34.1 >
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