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Wysocki" , Len Brown , Thomas Gleixner , Marc Zyngier , Daniel Lezcano , Jonathan Corbet , Anup Patel , Andrew Jones , Atish Patra , 'Conor Dooley ' , Sunil V L , "Rafael J . Wysocki" Subject: [PATCH V3 10/20] RISC-V: smpboot: Add ACPI support in smp_setup() Date: Fri, 3 Mar 2023 19:06:37 +0530 Message-Id: <20230303133647.845095-11-sunilvl@ventanamicro.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230303133647.845095-1-sunilvl@ventanamicro.com> References: <20230303133647.845095-1-sunilvl@ventanamicro.com> MIME-Version: 1.0 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1759354038351795533?= X-GMAIL-MSGID: =?utf-8?q?1759354038351795533?= Enable SMP boot on ACPI based platforms by using the RINTC structures in the MADT table. Signed-off-by: Sunil V L Acked-by: Rafael J. Wysocki Reviewed-by: Conor Dooley --- arch/riscv/kernel/smpboot.c | 72 ++++++++++++++++++++++++++++++++++++- 1 file changed, 71 insertions(+), 1 deletion(-) diff --git a/arch/riscv/kernel/smpboot.c b/arch/riscv/kernel/smpboot.c index 26214ddefaa4..27047322d3bb 100644 --- a/arch/riscv/kernel/smpboot.c +++ b/arch/riscv/kernel/smpboot.c @@ -8,6 +8,7 @@ * Copyright (C) 2017 SiFive */ +#include #include #include #include @@ -70,6 +71,72 @@ void __init smp_prepare_cpus(unsigned int max_cpus) } } +#ifdef CONFIG_ACPI +static unsigned int cpu_count = 1; + +static int __init acpi_parse_rintc(union acpi_subtable_headers *header, const unsigned long end) +{ + unsigned long hart; + static bool found_boot_cpu; + struct acpi_madt_rintc *processor = (struct acpi_madt_rintc *)header; + + /* + * Each RINTC structure in MADT will have a flag. If ACPI_MADT_ENABLED + * bit in the flag is not enabled, it means OS should not try to enable + * the cpu to which RINTC belongs. + */ + if (!(processor->flags & ACPI_MADT_ENABLED)) + return 0; + + if (BAD_MADT_ENTRY(processor, end)) + return -EINVAL; + + acpi_table_print_madt_entry(&header->common); + + hart = processor->hart_id; + if (hart == INVALID_HARTID) { + pr_warn("Invalid hartid\n"); + return 0; + } + + if (hart == cpuid_to_hartid_map(0)) { + BUG_ON(found_boot_cpu); + found_boot_cpu = true; + early_map_cpu_to_node(0, NUMA_NO_NODE); + return 0; + } + + if (cpu_count >= NR_CPUS) { + pr_warn("NR_CPUS is too small for the number of ACPI tables.\n"); + return 0; + } + + cpuid_to_hartid_map(cpu_count) = hart; + early_map_cpu_to_node(cpu_count, NUMA_NO_NODE); + cpu_count++; + + return 0; +} + +static void __init acpi_parse_and_init_cpus(void) +{ + int cpuid; + + cpu_set_ops(0); + + acpi_table_parse_madt(ACPI_MADT_TYPE_RINTC, acpi_parse_rintc, 0); + + for (cpuid = 1; cpuid < nr_cpu_ids; cpuid++) { + if (cpuid_to_hartid_map(cpuid) != INVALID_HARTID) { + cpu_set_ops(cpuid); + set_cpu_possible(cpuid, true); + } + } +} +#else +#define acpi_parse_and_init_cpus(...) do { } while (0) +#endif + static void __init of_parse_and_init_cpus(void) { struct device_node *dn; @@ -118,7 +185,10 @@ static void __init of_parse_and_init_cpus(void) void __init setup_smp(void) { - of_parse_and_init_cpus(); + if (acpi_disabled) + of_parse_and_init_cpus(); + else + acpi_parse_and_init_cpus(); } static int start_secondary_cpu(int cpu, struct task_struct *tidle)