From: geoff@infradead.org (Geoff Levand)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 10/19] ARM64 / ACPI: Get the enable method for SMP initialization in ACPI way
Date: Thu, 31 Jul 2014 11:52:04 -0700 [thread overview]
Message-ID: <1406832724.8971.29.camel@smoke> (raw)
In-Reply-To: <1406206825-15590-11-git-send-email-hanjun.guo@linaro.org>
Hi Hanjun,
On Thu, 2014-07-24 at 21:00 +0800, Hanjun Guo wrote:
> ACPI 5.1 only has two explicit methods to boot up SMP,
> PSCI and Parking protocol, but the Parking protocol is
> only suitable for ARMv7 now, so make PSCI as the only way
> for the SMP boot protocol before some updates for the
> ACPI spec or the Parking protocol spec.
>
> Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
> Signed-off-by: Tomasz Nowicki <tomasz.nowicki@linaro.org>
> ---
> arch/arm64/include/asm/acpi.h | 21 +++++++++++++++
> arch/arm64/include/asm/cpu_ops.h | 9 ++++++-
> arch/arm64/include/asm/smp.h | 2 +-
> arch/arm64/kernel/acpi.c | 9 +++++++
> arch/arm64/kernel/cpu_ops.c | 52 ++++++++++++++++++++++++++++++++++----
> arch/arm64/kernel/smp.c | 29 +++++++++++++++++++--
> 6 files changed, 113 insertions(+), 9 deletions(-)
>
> diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h
> index 5ce85f8..6240327 100644
> --- a/arch/arm64/include/asm/acpi.h
> +++ b/arch/arm64/include/asm/acpi.h
> @@ -14,6 +14,27 @@
>
> /* Basic configuration for ACPI */
> #ifdef CONFIG_ACPI
^^ This seems to be a tab (\t) character here, which is a strange thing
for me to see...
> +/*
> + * ACPI 5.1 only has two explicit methods to
> + * boot up SMP, PSCI and Parking protocol,
> + * but the Parking protocol is only defined
> + * for ARMv7 now, so make PSCI as the only
> + * way for the SMP boot protocol before some
> + * updates for the ACPI spec or the Parking
> + * protocol spec.
> + *
> + * This enum is intend to make the boot method
> + * scalable when above updates are happended,
> + * which NOT means to support all of them.
> + */
This comment will become out of date soon (I hope), and it is often the
case that these short term comments are not removed, so I think it
better to put this kind of note into the commit message, not the code.
> +enum acpi_smp_boot_protocol {
> + ACPI_SMP_BOOT_PSCI,
> + ACPI_SMP_BOOT_PARKING_PROTOCOL,
> + ACPI_SMP_BOOT_PROTOCOL_MAX
> +};
> +
> +enum acpi_smp_boot_protocol smp_boot_protocol(void);
> +
> extern int acpi_disabled;
> extern int acpi_noirq;
> extern int acpi_pci_disabled;
> diff --git a/arch/arm64/include/asm/cpu_ops.h b/arch/arm64/include/asm/cpu_ops.h
> index d7b4b38..2a7c6fd 100644
> --- a/arch/arm64/include/asm/cpu_ops.h
> +++ b/arch/arm64/include/asm/cpu_ops.h
> @@ -61,7 +61,14 @@ struct cpu_operations {
> };
>
> extern const struct cpu_operations *cpu_ops[NR_CPUS];
> -extern int __init cpu_read_ops(struct device_node *dn, int cpu);
> +extern int __init cpu_of_read_ops(struct device_node *dn, int cpu);
> +
> +#ifdef CONFIG_ACPI
> +extern int __init cpu_acpi_read_ops(int cpu);
> +#else
> +static inline int __init cpu_acpi_read_ops(int cpu) { return -ENODEV; }
> +#endif
This looks messy and not scalable for new enable methods. It
seems a better way is to retain cpu_read_ops() and its functionality,
which is to return the proper enable method for that cpu in a generic
way.
Is there some reason you can't integrate acpi into the existing
cpu_ops and need to make this completely parallel method?
> extern void __init cpu_read_bootcpu_ops(void);
>
> #endif /* ifndef __ASM_CPU_OPS_H */
> diff --git a/arch/arm64/include/asm/smp.h b/arch/arm64/include/asm/smp.h
> index a498f2c..a5cea56 100644
> --- a/arch/arm64/include/asm/smp.h
> +++ b/arch/arm64/include/asm/smp.h
> @@ -39,7 +39,7 @@ extern void show_ipi_list(struct seq_file *p, int prec);
> extern void handle_IPI(int ipinr, struct pt_regs *regs);
>
> /*
> - * Setup the set of possible CPUs (via set_cpu_possible)
> + * Platform specific SMP operations
> */
> extern void smp_init_cpus(void);
>
> diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c
> index ff0f6a0..2af6662 100644
> --- a/arch/arm64/kernel/acpi.c
> +++ b/arch/arm64/kernel/acpi.c
> @@ -184,6 +184,15 @@ static int __init acpi_parse_madt_gic_cpu_interface_entries(void)
> return 0;
> }
>
> +/* Protocol to bring up secondary CPUs */
> +enum acpi_smp_boot_protocol smp_boot_protocol(void)
> +{
> + if (acpi_psci_present)
> + return ACPI_SMP_BOOT_PSCI;
> + else
> + return ACPI_SMP_BOOT_PARKING_PROTOCOL;
> +}
> +
> static int __init acpi_parse_fadt(struct acpi_table_header *table)
> {
> struct acpi_table_fadt *fadt = (struct acpi_table_fadt *)table;
> diff --git a/arch/arm64/kernel/cpu_ops.c b/arch/arm64/kernel/cpu_ops.c
> index d62d12f..4d9b3cf 100644
> --- a/arch/arm64/kernel/cpu_ops.c
> +++ b/arch/arm64/kernel/cpu_ops.c
> @@ -16,11 +16,13 @@
> * along with this program. If not, see <http://www.gnu.org/licenses/>.
> */
>
> -#include <asm/cpu_ops.h>
> -#include <asm/smp_plat.h>
> #include <linux/errno.h>
> #include <linux/of.h>
> #include <linux/string.h>
> +#include <linux/acpi.h>
> +
> +#include <asm/cpu_ops.h>
> +#include <asm/smp_plat.h>
>
> extern const struct cpu_operations smp_spin_table_ops;
> extern const struct cpu_operations cpu_psci_ops;
> @@ -52,7 +54,7 @@ static const struct cpu_operations * __init cpu_get_ops(const char *name)
> /*
> * Read a cpu's enable method from the device tree and record it in cpu_ops.
> */
> -int __init cpu_read_ops(struct device_node *dn, int cpu)
> +int __init cpu_of_read_ops(struct device_node *dn, int cpu)
> {
> const char *enable_method = of_get_property(dn, "enable-method", NULL);
> if (!enable_method) {
> @@ -76,12 +78,52 @@ int __init cpu_read_ops(struct device_node *dn, int cpu)
> return 0;
> }
>
> +#ifdef CONFIG_ACPI
> +/*
> + * Read a cpu's enable method in the ACPI way and record it in cpu_ops.
> + */
> +int __init cpu_acpi_read_ops(int cpu)
> +{
> + /*
> + * For ACPI 5.1, only two kind of methods are provided,
> + * Parking protocol and PSCI, but Parking protocol is
> + * used on ARMv7 only, so make PSCI as the only method
> + * for SMP initialization before the ACPI spec or Parking
> + * protocol spec is updated.
> + */
Again, this comment will get old fast (I hope).
> + switch (smp_boot_protocol()) {
> + case ACPI_SMP_BOOT_PSCI:
> + cpu_ops[cpu] = cpu_get_ops("psci");
> + break;
> + case ACPI_SMP_BOOT_PARKING_PROTOCOL:
> + default:
> + cpu_ops[cpu] = NULL;
> + break;
> + }
> +
> + if (!cpu_ops[cpu]) {
> + pr_warn("CPU %d: unsupported enable-method, only PSCI is supported\n",
> + cpu);
> + return -EOPNOTSUPP;
> + }
> +
> + return 0;
> +}
> +#endif
> +
> void __init cpu_read_bootcpu_ops(void)
> {
> - struct device_node *dn = of_get_cpu_node(0, NULL);
> + struct device_node *dn;
> +
> + if (!acpi_disabled) {
> + cpu_acpi_read_ops(0);
> + return;
> + }
> +
> + dn = of_get_cpu_node(0, NULL);
> if (!dn) {
> pr_err("Failed to find device node for boot cpu\n");
> return;
> }
> - cpu_read_ops(dn, 0);
> + cpu_of_read_ops(dn, 0);
> }
> diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
> index 8f1d37c..cb71662 100644
> --- a/arch/arm64/kernel/smp.c
> +++ b/arch/arm64/kernel/smp.c
> @@ -315,7 +315,7 @@ static void (*smp_cross_call)(const struct cpumask *, unsigned int);
> * cpu logical map array containing MPIDR values related to logical
> * cpus. Assumes that cpu_logical_map(0) has already been initialized.
> */
> -void __init smp_init_cpus(void)
> +static void __init of_smp_init_cpus(void)
> {
> struct device_node *dn = NULL;
> unsigned int i, cpu = 1;
> @@ -387,7 +387,7 @@ void __init smp_init_cpus(void)
> if (cpu >= NR_CPUS)
> goto next;
>
> - if (cpu_read_ops(dn, cpu) != 0)
> + if (cpu_of_read_ops(dn, cpu) != 0)
> goto next;
>
> if (cpu_ops[cpu]->cpu_init(dn, cpu))
> @@ -418,6 +418,31 @@ next:
> set_cpu_possible(i, true);
> }
>
> +/*
> + * In ACPI mode, the cpu possible map was enumerated before SMP
> + * initialization when MADT table was parsed, so we can get the
> + * possible map here to initialize CPUs.
> + */
> +static void __init acpi_smp_init_cpus(void)
> +{
> + int cpu;
> +
> + for_each_possible_cpu(cpu) {
> + if (cpu_acpi_read_ops(cpu) != 0)
> + continue;
> +
> + cpu_ops[cpu]->cpu_init(NULL, cpu);
> + }
> +}
> +
> +void __init smp_init_cpus(void)
> +{
> + if (acpi_disabled)
> + of_smp_init_cpus();
> + else
> + acpi_smp_init_cpus();
> +}
This is the same as cpu_ops, is acpi so special we need a completely
parallel method of initializing secondary cpus?
-Geoff
next prev parent reply other threads:[~2014-07-31 18:52 UTC|newest]
Thread overview: 131+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-24 13:00 [PATCH 00/19] Introduce ACPI for ARM64 based on ACPI 5.1 Hanjun Guo
2014-07-24 13:00 ` [PATCH 01/19] ARM64 / ACPI: Get RSDP and ACPI boot-time tables Hanjun Guo
2014-07-28 18:29 ` Sudeep Holla
2014-07-28 22:49 ` Graeme Gregory
2014-07-29 8:49 ` Sudeep Holla
2014-07-29 13:08 ` Hanjun Guo
2014-07-29 13:50 ` Sudeep Holla
2014-07-29 14:07 ` Hanjun Guo
2014-07-28 18:30 ` Sudeep Holla
2014-07-24 13:00 ` [PATCH 02/19] ARM64 / ACPI: Introduce early_param for "acpi" Hanjun Guo
2014-07-28 18:35 ` Sudeep Holla
2014-07-29 13:10 ` Hanjun Guo
2014-07-24 13:00 ` [PATCH 03/19] ARM64 / ACPI: Introduce lowlevel suspend function Hanjun Guo
2014-07-24 15:34 ` Mark Rutland
2014-07-25 10:42 ` Hanjun Guo
2014-07-28 18:28 ` Sudeep Holla
2014-07-29 13:00 ` Hanjun Guo
2014-07-24 13:00 ` [PATCH 04/19] ARM64 / ACPI: Introduce arch_fix_phys_package_id() for cpu topology Hanjun Guo
2014-07-24 14:43 ` Mark Brown
2014-07-25 10:32 ` Hanjun Guo
2014-07-28 18:51 ` Sudeep Holla
2014-08-01 6:35 ` Hanjun Guo
2014-08-01 10:48 ` Sudeep Holla
2014-07-24 13:00 ` [PATCH 05/19] ARM64 / ACPI: Make PCI optional for ACPI on ARM64 Hanjun Guo
2014-07-24 21:57 ` Naresh Bhat
2014-07-29 16:40 ` Sudeep Holla
2014-07-24 13:00 ` [PATCH 06/19] ARM64 / ACPI: Parse FADT table to get PSCI flags for PSCI init Hanjun Guo
2014-07-29 16:40 ` Sudeep Holla
2014-07-31 3:53 ` Hanjun Guo
2014-07-31 4:22 ` Olof Johansson
2014-07-31 10:23 ` Hanjun Guo
2014-08-20 15:02 ` Grant Likely
2014-08-20 15:00 ` Grant Likely
2014-08-20 15:29 ` Catalin Marinas
2014-08-20 15:43 ` graeme.gregory at linaro.org
2014-07-24 13:00 ` [PATCH 07/19] ARM64 / ACPI: Parse MADT to map logical cpu to MPIDR and get cpu_possible/present_map Hanjun Guo
2014-07-24 23:06 ` Naresh Bhat
2014-07-25 11:11 ` Hanjun Guo
2014-07-30 18:20 ` Sudeep Holla
2014-07-31 8:14 ` Hanjun Guo
2014-08-20 15:14 ` Grant Likely
2014-07-24 13:00 ` [PATCH 08/19] ACPI / table: Print GIC information when MADT is parsed Hanjun Guo
2014-07-30 18:21 ` Sudeep Holla
2014-07-31 8:15 ` Hanjun Guo
2014-07-24 13:00 ` [PATCH 09/19] ARM64 / ACPI: Move the initialization of cpu_logical_map(0) before acpi_boot_init() Hanjun Guo
2014-07-24 15:21 ` Mark Rutland
2014-07-25 10:39 ` Hanjun Guo
2014-07-25 12:18 ` Mark Rutland
2014-07-24 13:00 ` [PATCH 10/19] ARM64 / ACPI: Get the enable method for SMP initialization in ACPI way Hanjun Guo
2014-07-24 15:47 ` Mark Rutland
2014-07-25 10:51 ` Hanjun Guo
2014-07-25 12:24 ` Mark Rutland
2014-07-29 8:12 ` Hanjun Guo
2014-07-31 6:54 ` Olof Johansson
2014-07-31 10:57 ` Hanjun Guo
2014-08-04 9:56 ` Hanjun Guo
2014-07-31 18:52 ` Geoff Levand [this message]
2014-08-01 6:49 ` Hanjun Guo
2014-07-24 13:00 ` [PATCH 11/19] ACPI / processor: Make it possible to get CPU hardware ID via GICC Hanjun Guo
2014-07-24 13:00 ` [PATCH 12/19] ARM64 / ACPI: Introduce ACPI_IRQ_MODEL_GIC and register device's gsi Hanjun Guo
2014-07-24 13:00 ` [PATCH 13/19] ACPI / table: Add new function to get table entries Hanjun Guo
2014-07-24 13:00 ` [PATCH 14/19] ARM64 / ACPI: Add GICv2 specific ACPI boot support Hanjun Guo
2014-07-24 13:00 ` [PATCH 15/19] ARM64 / ACPI: Parse GTDT to initialize arch timer Hanjun Guo
2014-07-24 13:00 ` [PATCH 16/19] ARM64 / ACPI: Select ACPI_REDUCED_HARDWARE_ONLY if ACPI is enabled on ARM64 Hanjun Guo
2014-07-24 13:00 ` [PATCH 17/19] ARM64 / ACPI: If we chose to boot from acpi then disable FDT Hanjun Guo
2014-07-24 13:00 ` [PATCH 18/19] ARM64 / ACPI: Enable ARM64 in Kconfig Hanjun Guo
2014-07-24 13:00 ` [PATCH 19/19] Documentation: ACPI for ARM64 Hanjun Guo
2014-07-24 20:42 ` Randy Dunlap
2014-07-25 10:55 ` Hanjun Guo
[not found] ` <CAFoFrHaWWxRPRYM5+bWj0tGnz05SokqwVGejUCUi+U-KChFBdQ@mail.gmail.com>
2014-07-24 21:19 ` Randy Dunlap
2014-07-29 10:07 ` Christoffer Dall
2014-07-27 2:34 ` Olof Johansson
2014-07-28 8:42 ` Graeme Gregory
2014-07-28 16:23 ` Olof Johansson
2014-07-28 17:44 ` Mark Brown
2014-07-28 9:07 ` Arnd Bergmann
2014-07-28 9:23 ` Graeme Gregory
2014-07-28 10:46 ` Arnd Bergmann
2014-07-28 14:20 ` Andre Przywara
2014-07-28 15:23 ` Arnd Bergmann
2014-07-28 16:14 ` Andre Przywara
2014-07-29 9:17 ` Graeme Gregory
2014-07-29 10:07 ` Arnd Bergmann
2014-07-28 10:12 ` Mark Rutland
2014-07-28 16:33 ` Olof Johansson
2014-07-28 18:37 ` Mark Rutland
2014-07-28 18:44 ` Olof Johansson
2014-07-28 16:27 ` Olof Johansson
2014-07-28 17:00 ` Mark Rutland
2014-07-28 18:27 ` Olof Johansson
2014-08-12 18:23 ` Catalin Marinas
2014-08-13 23:41 ` Rafael J. Wysocki
2014-08-14 3:21 ` Hanjun Guo
2014-08-14 10:27 ` Catalin Marinas
2014-08-14 20:53 ` Arnd Bergmann
2014-08-15 1:02 ` Olof Johansson
2014-08-15 19:49 ` Arnd Bergmann
2014-08-15 23:19 ` Mark Brown
2014-08-16 12:51 ` graeme.gregory at linaro.org
2014-08-15 9:09 ` Hanjun Guo
2014-08-15 10:01 ` Catalin Marinas
2014-08-18 9:29 ` Hanjun Guo
2014-08-18 12:49 ` Mark Rutland
2014-08-20 22:17 ` Olof Johansson
2014-08-21 4:00 ` Hanjun Guo
2014-07-29 9:01 ` Hanjun Guo
2014-07-28 10:06 ` Mark Rutland
2014-07-28 16:44 ` Olof Johansson
2014-07-28 17:36 ` Mark Rutland
2014-07-28 18:34 ` Olof Johansson
2014-07-29 10:29 ` Christoffer Dall
2014-07-29 10:41 ` Arnd Bergmann
2014-07-29 10:55 ` Mark Rutland
2014-07-29 11:28 ` Mark Rutland
2014-07-29 12:37 ` Christoffer Dall
2014-07-29 12:52 ` Arnd Bergmann
2014-07-29 13:08 ` Mark Rutland
2014-07-29 13:31 ` Christoffer Dall
2014-07-29 14:04 ` Mark Rutland
2014-07-29 14:41 ` Arnd Bergmann
2014-07-29 15:01 ` Christoffer Dall
2014-07-30 6:47 ` Hanjun Guo
2014-07-30 7:14 ` Christoffer Dall
2014-07-30 9:36 ` Hanjun Guo
2014-07-29 13:33 ` Christoffer Dall
2014-07-29 7:58 ` Hanjun Guo
2014-07-29 10:30 ` Christoffer Dall
2014-08-15 22:43 ` Len Brown
2014-08-16 12:45 ` Graeme Gregory
2014-08-20 16:42 ` Grant Likely
2014-07-25 0:46 ` [PATCH 00/19] Introduce ACPI for ARM64 based on ACPI 5.1 Hanjun Guo
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