Hi Olof,
On 2015年03月06日 02:49, Olof Johansson wrote:
Hi,
On Wed, Feb 25, 2015 at 04:39:53PM +0800, Hanjun Guo wrote:
MADT contains the information for MPIDR which is essential for
SMP initialization, parse the GIC cpu interface structures to
get the MPIDR value and map it to cpu_logical_map(), and add
enabled cpu with valid MPIDR into cpu_possible_map.
ACPI 5.1 only has two explicit methods to boot up SMP, PSCI and
Parking protocol, but the Parking protocol is only specified 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.
Parking protocol patches for SMP boot will be sent to upstream when
the new version of Parking protocol is ready.
CC: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
CC: Catalin Marinas <catalin.marinas@xxxxxxx>
CC: Will Deacon <will.deacon@xxxxxxx>
CC: Mark Rutland <mark.rutland@xxxxxxx>
Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx>
Tested-by: Yijing Wang <wangyijing@xxxxxxxxxx>
Tested-by: Mark Langsdorf <mlangsdo@xxxxxxxxxx>
Tested-by: Jon Masters <jcm@xxxxxxxxxx>
Tested-by: Timur Tabi <timur@xxxxxxxxxxxxxx>
Tested-by: Robert Richter <rrichter@xxxxxxxxxx>
Acked-by: Robert Richter <rrichter@xxxxxxxxxx>
Signed-off-by: Hanjun Guo <hanjun.guo@xxxxxxxxxx>
Signed-off-by: Tomasz Nowicki <tomasz.nowicki@xxxxxxxxxx>
Some nits below. Up to you if you fix incrementally or respin, but I'd like to
see them fixed for consistency's sake.
Acked-by: Olof Johansson <olof@xxxxxxxxx>
diff --git a/arch/arm64/include/asm/smp.h b/arch/arm64/include/asm/smp.h
index 780f82c..bf22650 100644
--- a/arch/arm64/include/asm/smp.h
+++ b/arch/arm64/include/asm/smp.h
@@ -39,9 +39,10 @@ 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)
+ * Discover the set of possible CPUs and determine their
+ * SMP operations.
*/
-extern void smp_init_cpus(void);
+extern void of_smp_init_cpus(void);
This is inconsistent naming, we use dt some places, of elsewhere.
Do you mean dt_smp_init_cpus() here?
diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c
index bdcc9fc..0f35d87 100644
--- a/arch/arm64/kernel/acpi.c
+++ b/arch/arm64/kernel/acpi.c
@@ -25,6 +25,10 @@
#include <linux/of_fdt.h>
#include <linux/smp.h>
+#include <asm/cputype.h>
+#include <asm/cpu_ops.h>
+#include <asm/smp_plat.h>
+
int acpi_noirq = 1; /* skip ACPI IRQ initialization */
int acpi_disabled = 1;
EXPORT_SYMBOL(acpi_disabled);
@@ -32,6 +36,12 @@ EXPORT_SYMBOL(acpi_disabled);
int acpi_pci_disabled = 1; /* skip ACPI PCI scan and IRQ initialization */
EXPORT_SYMBOL(acpi_pci_disabled);
[...]
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index 97fa7f3..b278311 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -393,13 +393,16 @@ void __init setup_arch(char **cmdline_p)
if (acpi_disabled) {
unflatten_device_tree();
psci_dt_init();
+ cpu_read_bootcpu_ops();
+#ifdef CONFIG_SMP
+ of_smp_init_cpus();
+#endif
} else {
psci_acpi_init();
+ acpi_init_cpus();
}
- cpu_read_bootcpu_ops();
#ifdef CONFIG_SMP
- smp_init_cpus();
smp_build_mpidr_hash();
#endif
I'd rather do without another ifdef above and provide a stub for that function,
but again it might make sense to just keep a small smp_init_cpus() just as with
the psci setup.
The cpu_read_bootcpu_ops() should be pushed down to the dt implementation to
keep the paths more common between acpi and dt.
the declaration of of_smp_init_cpus() is in asm/smp.h, unfortunately
the way asm/smp.h is handled is generally a mess, it only be compiled
in SMP build:
#ifndef CONFIG_SMP
# error "<asm/smp.h> included in non-SMP build"
#endif
so I think we need more cleanup before provide a stub function.
Thanks
Hanjun
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