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Date: Wed, 4 Dec 2013 00:39:06 +0800
From: Hanjun Guo <hanjun.guo@...aro.org>
To: "Rafael J. Wysocki" <rjw@...ysocki.net>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will.deacon@....com>,
Russell King - ARM Linux <linux@....linux.org.uk>,
Daniel Lezcano <daniel.lezcano@...aro.org>
Cc: linux-acpi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
Grant Likely <grant.likely@...aro.org>,
Matthew Garrett <mjg59@...f.ucam.org>,
Olof Johansson <olof@...om.net>,
Linus Walleij <linus.walleij@...aro.org>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Rob Herring <rob.herring@...xeda.com>,
Mark Rutland <mark.rutland@....com>,
Jon Masters <jonathan@...masters.org>, patches@...aro.org,
linux-kernel@...r.kernel.org, linaro-kernel@...ts.linaro.org,
linaro-acpi@...ts.linaro.org, Hanjun Guo <hanjun.guo@...aro.org>
Subject: [RFC part2 PATCH 2/9] ARM64 / ACPI: Prefill cpu possible/present maps and map logical cpu id to APIC id
When boot the kernel with MADT, the cpu possible and present maps should be
prefilled for cpu topology and acpi based cpu hot-plug.
The logic cpu id maps to APIC id (GIC id) is also implemented, it is needed
for acpi processor drivers.
Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>
---
arch/arm64/include/asm/acpi.h | 10 ++--
arch/arm64/kernel/setup.c | 2 +
arch/arm64/kernel/smp.c | 2 +
drivers/acpi/plat/arm-core.c | 118 +++++++++++++++++++++++++++++++++++++++++
4 files changed, 129 insertions(+), 3 deletions(-)
diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h
index be2951c..423a32c 100644
--- a/arch/arm64/include/asm/acpi.h
+++ b/arch/arm64/include/asm/acpi.h
@@ -76,9 +76,6 @@ static inline void acpi_disable_pci(void)
/* FIXME: this function should be moved to topology.h when it's ready */
void arch_fix_phys_package_id(int num, u32 slot);
-/* temperally define -1 to make acpi core compilerable */
-#define cpu_physical_id(cpu) -1
-
/* Low-level suspend routine. */
extern int (*acpi_suspend_lowlevel)(void);
#define acpi_wakeup_address (0)
@@ -86,6 +83,13 @@ extern int (*acpi_suspend_lowlevel)(void);
#define MAX_GIC_CPU_INTERFACE 256
#define MAX_GIC_DISTRIBUTOR 1 /* should be the same as MAX_GIC_NR */
+/* map logic cpu id to physical GIC id */
+extern int arm_cpu_to_apicid[NR_CPUS];
+extern int boot_cpu_apic_id;
+#define cpu_physical_id(cpu) arm_cpu_to_apicid[cpu]
+
+extern void prefill_possible_map(void);
+
#else /* !CONFIG_ACPI */
#define acpi_disabled 1 /* ACPI sometimes enabled on ARM */
#define acpi_noirq 1 /* ACPI sometimes enabled on ARM */
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index 8199360..08f11e2 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -231,7 +231,9 @@ void __init setup_arch(char **cmdline_p)
*/
acpi_boot_table_init();
early_acpi_boot_init();
+ boot_cpu_apic_id = read_cpuid_mpidr() & MPIDR_HWID_BITMASK;
acpi_boot_init();
+ prefill_possible_map();
paging_init();
request_standard_resources();
diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index a0c2ca6..1428024 100644
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -420,7 +420,9 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
if (err)
continue;
+#ifndef CONFIG_ACPI
set_cpu_present(cpu, true);
+#endif
max_cpus--;
}
}
diff --git a/drivers/acpi/plat/arm-core.c b/drivers/acpi/plat/arm-core.c
index 45ff625..8527ecc 100644
--- a/drivers/acpi/plat/arm-core.c
+++ b/drivers/acpi/plat/arm-core.c
@@ -58,6 +58,13 @@ EXPORT_SYMBOL(acpi_pci_disabled);
*/
static u64 acpi_lapic_addr __initdata;
+/* available_cpus here means enabled cpu in MADT */
+int available_cpus;
+
+/* Map logic cpu id to physical GIC id. */
+int arm_cpu_to_apicid[NR_CPUS] = { [0 ... NR_CPUS-1] = -1 };
+int boot_cpu_apic_id = -1;
+
#define BAD_MADT_ENTRY(entry, end) ( \
(!entry) || (unsigned long)entry + sizeof(*entry) > end || \
((struct acpi_subtable_header *)entry)->length < sizeof(*entry))
@@ -142,6 +149,39 @@ static int __init acpi_parse_madt(struct acpi_table_header *table)
* Please refer to chapter5.2.12.14/15 of ACPI 5.0
*/
+static void acpi_register_gic_cpu_interface(int id, u8 enabled)
+{
+ int cpu;
+
+ if (id >= MAX_GIC_CPU_INTERFACE) {
+ pr_info(PREFIX "skipped apicid that is too big\n");
+ return;
+ }
+
+ total_cpus++;
+ if (!enabled)
+ return;
+
+ available_cpus++;
+
+ /* allocate a logic cpu id for the new comer */
+ if (boot_cpu_apic_id == id) {
+ /*
+ * boot_cpu_init() already hold bit 0 in cpu_present_mask
+ * for BSP, no need to allocte again.
+ */
+ cpu = 0;
+ } else {
+ cpu = cpumask_next_zero(-1, cpu_present_mask);
+ }
+
+ /* map the logic cpu id to APIC id */
+ arm_cpu_to_apicid[cpu] = id;
+
+ set_cpu_present(cpu, true);
+ set_cpu_possible(cpu, true);
+}
+
static int __init
acpi_parse_gic(struct acpi_subtable_header *header, const unsigned long end)
{
@@ -154,6 +194,16 @@ acpi_parse_gic(struct acpi_subtable_header *header, const unsigned long end)
acpi_table_print_madt_entry(header);
+ /*
+ * We need to register disabled CPU as well to permit
+ * counting disabled CPUs. This allows us to size
+ * cpus_possible_map more accurately, to permit
+ * to not preallocating memory for all NR_CPUS
+ * when we use CPU hotplug.
+ */
+ acpi_register_gic_cpu_interface(processor->gic_id,
+ processor->flags & ACPI_MADT_ENABLED);
+
return 0;
}
@@ -196,6 +246,19 @@ static int __init acpi_parse_madt_gic_entries(void)
return count;
}
+#ifdef CONFIG_SMP
+ if (available_cpus == 0) {
+ pr_info(PREFIX "Found 0 CPUs; assuming 1\n");
+ /* FIXME: should be the real GIC id read from hardware */
+ arm_cpu_to_apicid[available_cpus] = 0;
+ available_cpus = 1; /* We've got at least one of these */
+ }
+#endif
+
+ /* Make boot-up look pretty */
+ pr_info("%d CPUs available, %d CPUs total\n", available_cpus,
+ total_cpus);
+
return 0;
}
@@ -221,6 +284,61 @@ static int __init acpi_parse_madt_gic_distributor_entries(void)
return 0;
}
+static int setup_possible_cpus __initdata = -1;
+static int __init _setup_possible_cpus(char *str)
+{
+ get_option(&str, &setup_possible_cpus);
+ return 0;
+}
+early_param("possible_cpus", _setup_possible_cpus);
+
+/*
+ * cpu_possible_mask should be static, it cannot change as cpu's
+ * are onlined, or offlined. The reason is per-cpu data-structures
+ * are allocated by some modules at init time, and dont expect to
+ * do this dynamically on cpu arrival/departure.
+ * cpu_present_mask on the other hand can change dynamically.
+ * In case when cpu_hotplug is not compiled, then we resort to current
+ * behaviour, which is cpu_possible == cpu_present.
+ * - Ashok Raj
+ *
+ * Three ways to find out the number of additional hotplug CPUs:
+ * - If the BIOS specified disabled CPUs in ACPI/mptables use that.
+ * - The user can overwrite it with possible_cpus=NUM
+ * - Otherwise don't reserve additional CPUs.
+ * We do this because additional CPUs waste a lot of memory.
+ * -AK
+ */
+void __init prefill_possible_map(void)
+{
+ int i;
+ int possible, disabled_cpus;
+
+ disabled_cpus = total_cpus - available_cpus;
+
+ if (setup_possible_cpus == -1) {
+ if (disabled_cpus > 0)
+ setup_possible_cpus = disabled_cpus;
+ else
+ setup_possible_cpus = 0;
+ }
+
+ possible = available_cpus + setup_possible_cpus;
+
+ pr_info("SMP: the system is limited to %d CPUs\n", nr_cpu_ids);
+
+ if (possible > nr_cpu_ids)
+ possible = nr_cpu_ids;
+
+ pr_info("SMP: Allowing %d CPUs, %d hotplug CPUs\n",
+ possible, max((possible - available_cpus), 0));
+
+ for (i = 0; i < possible; i++)
+ set_cpu_possible(i, true);
+ for (; i < NR_CPUS; i++)
+ set_cpu_possible(i, false);
+}
+
int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
{
*irq = gsi_to_irq(gsi);
--
1.7.9.5
--
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