diff options
| author | Sunil V L <sunilvl@ventanamicro.com> | 2023-05-15 07:49:14 +0200 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@rivosinc.com> | 2023-06-01 17:45:02 +0200 |
| commit | 8b7809e289524e02f8f0755ca632ea9e9aefbd0e (patch) | |
| tree | 8f0ff5deac7509dd2e444480f42b832436a33142 /drivers/acpi | |
| parent | RISC-V: Add support to build the ACPI core (diff) | |
| download | linux-8b7809e289524e02f8f0755ca632ea9e9aefbd0e.tar.xz linux-8b7809e289524e02f8f0755ca632ea9e9aefbd0e.zip | |
ACPI: processor_core: RISC-V: Enable mapping processor to the hartid
processor_core needs arch-specific functions to map the ACPI ID
to the physical ID. In RISC-V platforms, hartid is the physical id
and RINTC structure in MADT provides this mapping. Add arch-specific
function to get this mapping from RINTC.
Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Link: https://lore.kernel.org/r/20230515054928.2079268-8-sunilvl@ventanamicro.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Diffstat (limited to 'drivers/acpi')
| -rw-r--r-- | drivers/acpi/processor_core.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c index 2ac48cda5b20..d6606a9f2da6 100644 --- a/drivers/acpi/processor_core.c +++ b/drivers/acpi/processor_core.c @@ -106,6 +106,32 @@ static int map_gicc_mpidr(struct acpi_subtable_header *entry, return -EINVAL; } +/* + * Retrieve the RISC-V hartid for the processor + */ +static int map_rintc_hartid(struct acpi_subtable_header *entry, + int device_declaration, u32 acpi_id, + phys_cpuid_t *hartid) +{ + struct acpi_madt_rintc *rintc = + container_of(entry, struct acpi_madt_rintc, header); + + if (!(rintc->flags & ACPI_MADT_ENABLED)) + return -ENODEV; + + /* device_declaration means Device object in DSDT, in the + * RISC-V, logical processors are required to + * have a Processor Device object in the DSDT, so we should + * check device_declaration here + */ + if (device_declaration && rintc->uid == acpi_id) { + *hartid = rintc->hart_id; + return 0; + } + + return -EINVAL; +} + static phys_cpuid_t map_madt_entry(struct acpi_table_madt *madt, int type, u32 acpi_id) { @@ -136,6 +162,9 @@ static phys_cpuid_t map_madt_entry(struct acpi_table_madt *madt, } else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT) { if (!map_gicc_mpidr(header, type, acpi_id, &phys_id)) break; + } else if (header->type == ACPI_MADT_TYPE_RINTC) { + if (!map_rintc_hartid(header, type, acpi_id, &phys_id)) + break; } entry += header->length; } |