| Message ID | 1407166105-17675-10-git-send-email-hanjun.guo@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On Mon, Aug 04, 2014 at 04:28:16PM +0100, Hanjun Guo wrote: > diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h > index 022f4ad..a81898d 100644 > --- a/arch/arm64/include/asm/acpi.h > +++ b/arch/arm64/include/asm/acpi.h > @@ -12,6 +12,8 @@ > #ifndef _ASM_ACPI_H > #define _ASM_ACPI_H > > +#include <asm/smp_plat.h> > + > /* Basic configuration for ACPI */ > #ifdef CONFIG_ACPI > /* > @@ -59,6 +61,18 @@ static inline void disable_acpi(void) > acpi_noirq = 1; > } > > +u32 pack_mpidr_into_32_bits(u64 mpidr); I would define this as a static inline function here. > diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c > index e32321c..4007313 100644 > --- a/drivers/acpi/processor_core.c > +++ b/drivers/acpi/processor_core.c > @@ -64,6 +64,38 @@ static int map_lsapic_id(struct acpi_subtable_header *entry, > return 0; > } > > +/* > + * On ARM platform, MPIDR value is the hardware ID as apic ID > + * on Intel platforms > + */ > +static int map_gicc_mpidr(struct acpi_subtable_header *entry, > + int device_declaration, u32 acpi_id, int *mpidr) > +{ > + struct acpi_madt_generic_interrupt *gicc = > + container_of(entry, struct acpi_madt_generic_interrupt, header); > + > + if (!(gicc->flags & ACPI_MADT_ENABLED)) > + return -ENODEV; > + > + /* In the GIC interrupt model, logical processors are > + * required to have a Processor Device object in the DSDT, > + * so we should check device_declaration here > + */ > + if (device_declaration && (gicc->uid == acpi_id)) { > + /* > + * Only bits [0:7] Aff0, bits [8:15] Aff1, bits [16:23] Aff2 > + * and bits [32:39] Aff3 are meaningful, so pack the Affx > + * fields into a single 32 bit identifier to accommodate the > + * acpi processor drivers. > + */ > + *mpidr = ((gicc->arm_mpidr & 0xff00000000) >> 8) > + | gicc->arm_mpidr; You can use pack_mpidr_into_32_bits().
On 04/08/14 16:28, Hanjun Guo wrote: > Introduce a new function map_gicc_mpidr() to allow MPIDRs to be obtained > from the GICC Structure introduced by ACPI 5.1. > > MPIDR is the CPU hardware ID as local APIC ID on x86 platform, so we use > MPIDR not the GIC CPU interface ID to identify CPUs. > > Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org> > --- > arch/arm64/include/asm/acpi.h | 14 ++++++++++++++ > arch/arm64/kernel/acpi.c | 21 ++++++++++++++++++++- > drivers/acpi/processor_core.c | 37 +++++++++++++++++++++++++++++++++++++ > 3 files changed, 71 insertions(+), 1 deletion(-) > > diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h > index 022f4ad..a81898d 100644 > --- a/arch/arm64/include/asm/acpi.h > +++ b/arch/arm64/include/asm/acpi.h > @@ -12,6 +12,8 @@ > #ifndef _ASM_ACPI_H > #define _ASM_ACPI_H > > +#include <asm/smp_plat.h> > + > /* Basic configuration for ACPI */ > #ifdef CONFIG_ACPI > /* > @@ -59,6 +61,18 @@ static inline void disable_acpi(void) > acpi_noirq = 1; > } > > +u32 pack_mpidr_into_32_bits(u64 mpidr); > + > +/* > + * The ACPI processor driver for ACPI core code needs this macro > + * to find out this cpu was already mapped (mapping from CPU hardware > + * ID to CPU logical ID) or not. > + * > + * cpu_logical_map(cpu) is the mapping of MPIDR and the logical cpu, > + * and MPIDR is the cpu hardware ID we needed. You need to specify this is packed version of cpu_logical_map or better is to move pack_mpidr_into_32_bits here along with the description you have so that it's easy to understand. > + */ > +#define cpu_physical_id(cpu) pack_mpidr_into_32_bits(cpu_logical_map(cpu)) > + > /* > * Checking for the posibility that the CPU can be initialized from the MADT. > * It's used from ACPI core in crash kernel case where boot CPU is not > diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c > index 8a54b4e..ac7ab34 100644 > --- a/arch/arm64/kernel/acpi.c > +++ b/arch/arm64/kernel/acpi.c > @@ -22,7 +22,6 @@ > #include <linux/bootmem.h> > #include <linux/smp.h> > > -#include <asm/smp_plat.h> > #include <asm/cputype.h> > > int acpi_noirq; /* skip ACPI IRQ initialization */ > @@ -239,6 +238,26 @@ int __init acpi_boot_init(void) > return err; > } > > +/* MPIDR value provided in GICC structure is 64 bits, but > + * the acpi processor driver use the 32 bits cpu hardware > + * ID (apic_id on intel platform) everywhere, it is pretty > + * hard to modify the acpi processor driver to accept the > + * 64 bits MPIDR value, at the same time, only 32 bits of > + * the MPIDR is used in the 64 bits MPIDR, just pack the > + * Affx fields into a single 32 bit identifier to accommodate > + * the acpi processor drivers. > + */ > +u32 pack_mpidr_into_32_bits(u64 mpidr) > +{ > + /* > + * Bits [0:7] Aff0; > + * Bits [8:15] Aff1; > + * Bits [16:23] Aff2; > + * Bits [32:39] Aff3; > + */ > + return (u32) ((mpidr & 0xff00000000) >> 8) | mpidr; > +} > + > /* > * acpi_suspend_lowlevel() - save kernel state and suspend. > * > diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c > index e32321c..4007313 100644 > --- a/drivers/acpi/processor_core.c > +++ b/drivers/acpi/processor_core.c > @@ -64,6 +64,38 @@ static int map_lsapic_id(struct acpi_subtable_header *entry, > return 0; > } > > +/* > + * On ARM platform, MPIDR value is the hardware ID as apic ID > + * on Intel platforms > + */ > +static int map_gicc_mpidr(struct acpi_subtable_header *entry, > + int device_declaration, u32 acpi_id, int *mpidr) > +{ > + struct acpi_madt_generic_interrupt *gicc = > + container_of(entry, struct acpi_madt_generic_interrupt, header); > + > + if (!(gicc->flags & ACPI_MADT_ENABLED)) > + return -ENODEV; > + > + /* In the GIC interrupt model, logical processors are > + * required to have a Processor Device object in the DSDT, > + * so we should check device_declaration here > + */ > + if (device_declaration && (gicc->uid == acpi_id)) { > + /* > + * Only bits [0:7] Aff0, bits [8:15] Aff1, bits [16:23] Aff2 > + * and bits [32:39] Aff3 are meaningful, so pack the Affx > + * fields into a single 32 bit identifier to accommodate the > + * acpi processor drivers. > + */ > + *mpidr = ((gicc->arm_mpidr & 0xff00000000) >> 8) > + | gicc->arm_mpidr; Reuse pack_mpidr_into_32_bits > + return 0; > + } > + > + return -EINVAL; > +} > + > static int map_madt_entry(int type, u32 acpi_id) > { > unsigned long madt_end, entry; > @@ -99,6 +131,9 @@ static int map_madt_entry(int type, u32 acpi_id) > } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) { > if (!map_lsapic_id(header, type, acpi_id, &apic_id)) > break; > + } else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT) { > + if (!map_gicc_mpidr(header, type, acpi_id, &apic_id)) > + break; > } > entry += header->length; > } > @@ -131,6 +166,8 @@ static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id) > map_lsapic_id(header, type, acpi_id, &apic_id); > } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) { > map_x2apic_id(header, type, acpi_id, &apic_id); > + } else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT) { > + map_gicc_mpidr(header, type, acpi_id, &apic_id); > } > > exit: >
On 2014-8-18 22:27, Catalin Marinas wrote: > On Mon, Aug 04, 2014 at 04:28:16PM +0100, Hanjun Guo wrote: >> diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h >> index 022f4ad..a81898d 100644 >> --- a/arch/arm64/include/asm/acpi.h >> +++ b/arch/arm64/include/asm/acpi.h >> @@ -12,6 +12,8 @@ >> #ifndef _ASM_ACPI_H >> #define _ASM_ACPI_H >> >> +#include <asm/smp_plat.h> >> + >> /* Basic configuration for ACPI */ >> #ifdef CONFIG_ACPI >> /* >> @@ -59,6 +61,18 @@ static inline void disable_acpi(void) >> acpi_noirq = 1; >> } >> >> +u32 pack_mpidr_into_32_bits(u64 mpidr); > > I would define this as a static inline function here. ok, will update it. > >> diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c >> index e32321c..4007313 100644 >> --- a/drivers/acpi/processor_core.c >> +++ b/drivers/acpi/processor_core.c >> @@ -64,6 +64,38 @@ static int map_lsapic_id(struct acpi_subtable_header *entry, >> return 0; >> } >> >> +/* >> + * On ARM platform, MPIDR value is the hardware ID as apic ID >> + * on Intel platforms >> + */ >> +static int map_gicc_mpidr(struct acpi_subtable_header *entry, >> + int device_declaration, u32 acpi_id, int *mpidr) >> +{ >> + struct acpi_madt_generic_interrupt *gicc = >> + container_of(entry, struct acpi_madt_generic_interrupt, header); >> + >> + if (!(gicc->flags & ACPI_MADT_ENABLED)) >> + return -ENODEV; >> + >> + /* In the GIC interrupt model, logical processors are >> + * required to have a Processor Device object in the DSDT, >> + * so we should check device_declaration here >> + */ >> + if (device_declaration && (gicc->uid == acpi_id)) { >> + /* >> + * Only bits [0:7] Aff0, bits [8:15] Aff1, bits [16:23] Aff2 >> + * and bits [32:39] Aff3 are meaningful, so pack the Affx >> + * fields into a single 32 bit identifier to accommodate the >> + * acpi processor drivers. >> + */ >> + *mpidr = ((gicc->arm_mpidr & 0xff00000000) >> 8) >> + | gicc->arm_mpidr; > > You can use pack_mpidr_into_32_bits(). processor_core.c will be used by x86 and ia64 too, it will cause compile error on !ARM64 platforms. Thanks Hanjun
On 2014-8-19 2:34, Sudeep Holla wrote: [...] >> >> +#include <asm/smp_plat.h> >> + >> /* Basic configuration for ACPI */ >> #ifdef CONFIG_ACPI >> /* >> @@ -59,6 +61,18 @@ static inline void disable_acpi(void) >> acpi_noirq = 1; >> } >> >> +u32 pack_mpidr_into_32_bits(u64 mpidr); >> + >> +/* >> + * The ACPI processor driver for ACPI core code needs this macro >> + * to find out this cpu was already mapped (mapping from CPU hardware >> + * ID to CPU logical ID) or not. >> + * >> + * cpu_logical_map(cpu) is the mapping of MPIDR and the logical cpu, >> + * and MPIDR is the cpu hardware ID we needed. > > You need to specify this is packed version of cpu_logical_map or > better is to move pack_mpidr_into_32_bits here along with the > description you have so that it's easy to understand. Agreed, I will make pack_mpidr_into_32_bits() as inline function here and specify that it is the packed version we needed. Thanks Hanjun
On Tue, Aug 19, 2014 at 09:37:34AM +0100, Hanjun Guo wrote: > On 2014-8-18 22:27, Catalin Marinas wrote: > > On Mon, Aug 04, 2014 at 04:28:16PM +0100, Hanjun Guo wrote: > >> diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c > >> index e32321c..4007313 100644 > >> --- a/drivers/acpi/processor_core.c > >> +++ b/drivers/acpi/processor_core.c > >> @@ -64,6 +64,38 @@ static int map_lsapic_id(struct acpi_subtable_header *entry, > >> return 0; > >> } > >> > >> +/* > >> + * On ARM platform, MPIDR value is the hardware ID as apic ID > >> + * on Intel platforms > >> + */ > >> +static int map_gicc_mpidr(struct acpi_subtable_header *entry, > >> + int device_declaration, u32 acpi_id, int *mpidr) > >> +{ > >> + struct acpi_madt_generic_interrupt *gicc = > >> + container_of(entry, struct acpi_madt_generic_interrupt, header); > >> + > >> + if (!(gicc->flags & ACPI_MADT_ENABLED)) > >> + return -ENODEV; > >> + > >> + /* In the GIC interrupt model, logical processors are > >> + * required to have a Processor Device object in the DSDT, > >> + * so we should check device_declaration here > >> + */ > >> + if (device_declaration && (gicc->uid == acpi_id)) { > >> + /* > >> + * Only bits [0:7] Aff0, bits [8:15] Aff1, bits [16:23] Aff2 > >> + * and bits [32:39] Aff3 are meaningful, so pack the Affx > >> + * fields into a single 32 bit identifier to accommodate the > >> + * acpi processor drivers. > >> + */ > >> + *mpidr = ((gicc->arm_mpidr & 0xff00000000) >> 8) > >> + | gicc->arm_mpidr; > > > > You can use pack_mpidr_into_32_bits(). > > processor_core.c will be used by x86 and ia64 too, it will cause > compile error on !ARM64 platforms. Oh. So we do we have an ARM-specific function in core ACPI code?
On 2014-8-20 22:56, Catalin Marinas wrote: > On Tue, Aug 19, 2014 at 09:37:34AM +0100, Hanjun Guo wrote: >> On 2014-8-18 22:27, Catalin Marinas wrote: >>> On Mon, Aug 04, 2014 at 04:28:16PM +0100, Hanjun Guo wrote: >>>> diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c >>>> index e32321c..4007313 100644 >>>> --- a/drivers/acpi/processor_core.c >>>> +++ b/drivers/acpi/processor_core.c >>>> @@ -64,6 +64,38 @@ static int map_lsapic_id(struct acpi_subtable_header *entry, >>>> return 0; >>>> } >>>> >>>> +/* >>>> + * On ARM platform, MPIDR value is the hardware ID as apic ID >>>> + * on Intel platforms >>>> + */ >>>> +static int map_gicc_mpidr(struct acpi_subtable_header *entry, >>>> + int device_declaration, u32 acpi_id, int *mpidr) >>>> +{ >>>> + struct acpi_madt_generic_interrupt *gicc = >>>> + container_of(entry, struct acpi_madt_generic_interrupt, header); >>>> + >>>> + if (!(gicc->flags & ACPI_MADT_ENABLED)) >>>> + return -ENODEV; >>>> + >>>> + /* In the GIC interrupt model, logical processors are >>>> + * required to have a Processor Device object in the DSDT, >>>> + * so we should check device_declaration here >>>> + */ >>>> + if (device_declaration && (gicc->uid == acpi_id)) { >>>> + /* >>>> + * Only bits [0:7] Aff0, bits [8:15] Aff1, bits [16:23] Aff2 >>>> + * and bits [32:39] Aff3 are meaningful, so pack the Affx >>>> + * fields into a single 32 bit identifier to accommodate the >>>> + * acpi processor drivers. >>>> + */ >>>> + *mpidr = ((gicc->arm_mpidr & 0xff00000000) >> 8) >>>> + | gicc->arm_mpidr; >>> >>> You can use pack_mpidr_into_32_bits(). >> >> processor_core.c will be used by x86 and ia64 too, it will cause >> compile error on !ARM64 platforms. > > Oh. So we do we have an ARM-specific function in core ACPI code? Yes, GICC is ARM-specific, but all the mapping functions (get apic_id/mpidr via acpi_id in MADT) including x86/ia64 are all there, so it's better to put it here to keep consistency. Thanks Hanjun
diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h index 022f4ad..a81898d 100644 --- a/arch/arm64/include/asm/acpi.h +++ b/arch/arm64/include/asm/acpi.h @@ -12,6 +12,8 @@ #ifndef _ASM_ACPI_H #define _ASM_ACPI_H +#include <asm/smp_plat.h> + /* Basic configuration for ACPI */ #ifdef CONFIG_ACPI /* @@ -59,6 +61,18 @@ static inline void disable_acpi(void) acpi_noirq = 1; } +u32 pack_mpidr_into_32_bits(u64 mpidr); + +/* + * The ACPI processor driver for ACPI core code needs this macro + * to find out this cpu was already mapped (mapping from CPU hardware + * ID to CPU logical ID) or not. + * + * cpu_logical_map(cpu) is the mapping of MPIDR and the logical cpu, + * and MPIDR is the cpu hardware ID we needed. + */ +#define cpu_physical_id(cpu) pack_mpidr_into_32_bits(cpu_logical_map(cpu)) + /* * Checking for the posibility that the CPU can be initialized from the MADT. * It's used from ACPI core in crash kernel case where boot CPU is not diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c index 8a54b4e..ac7ab34 100644 --- a/arch/arm64/kernel/acpi.c +++ b/arch/arm64/kernel/acpi.c @@ -22,7 +22,6 @@ #include <linux/bootmem.h> #include <linux/smp.h> -#include <asm/smp_plat.h> #include <asm/cputype.h> int acpi_noirq; /* skip ACPI IRQ initialization */ @@ -239,6 +238,26 @@ int __init acpi_boot_init(void) return err; } +/* MPIDR value provided in GICC structure is 64 bits, but + * the acpi processor driver use the 32 bits cpu hardware + * ID (apic_id on intel platform) everywhere, it is pretty + * hard to modify the acpi processor driver to accept the + * 64 bits MPIDR value, at the same time, only 32 bits of + * the MPIDR is used in the 64 bits MPIDR, just pack the + * Affx fields into a single 32 bit identifier to accommodate + * the acpi processor drivers. + */ +u32 pack_mpidr_into_32_bits(u64 mpidr) +{ + /* + * Bits [0:7] Aff0; + * Bits [8:15] Aff1; + * Bits [16:23] Aff2; + * Bits [32:39] Aff3; + */ + return (u32) ((mpidr & 0xff00000000) >> 8) | mpidr; +} + /* * acpi_suspend_lowlevel() - save kernel state and suspend. * diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c index e32321c..4007313 100644 --- a/drivers/acpi/processor_core.c +++ b/drivers/acpi/processor_core.c @@ -64,6 +64,38 @@ static int map_lsapic_id(struct acpi_subtable_header *entry, return 0; } +/* + * On ARM platform, MPIDR value is the hardware ID as apic ID + * on Intel platforms + */ +static int map_gicc_mpidr(struct acpi_subtable_header *entry, + int device_declaration, u32 acpi_id, int *mpidr) +{ + struct acpi_madt_generic_interrupt *gicc = + container_of(entry, struct acpi_madt_generic_interrupt, header); + + if (!(gicc->flags & ACPI_MADT_ENABLED)) + return -ENODEV; + + /* In the GIC interrupt model, logical processors are + * required to have a Processor Device object in the DSDT, + * so we should check device_declaration here + */ + if (device_declaration && (gicc->uid == acpi_id)) { + /* + * Only bits [0:7] Aff0, bits [8:15] Aff1, bits [16:23] Aff2 + * and bits [32:39] Aff3 are meaningful, so pack the Affx + * fields into a single 32 bit identifier to accommodate the + * acpi processor drivers. + */ + *mpidr = ((gicc->arm_mpidr & 0xff00000000) >> 8) + | gicc->arm_mpidr; + return 0; + } + + return -EINVAL; +} + static int map_madt_entry(int type, u32 acpi_id) { unsigned long madt_end, entry; @@ -99,6 +131,9 @@ static int map_madt_entry(int type, u32 acpi_id) } else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) { if (!map_lsapic_id(header, type, acpi_id, &apic_id)) break; + } else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT) { + if (!map_gicc_mpidr(header, type, acpi_id, &apic_id)) + break; } entry += header->length; } @@ -131,6 +166,8 @@ static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id) map_lsapic_id(header, type, acpi_id, &apic_id); } else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC) { map_x2apic_id(header, type, acpi_id, &apic_id); + } else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT) { + map_gicc_mpidr(header, type, acpi_id, &apic_id); } exit:
Introduce a new function map_gicc_mpidr() to allow MPIDRs to be obtained from the GICC Structure introduced by ACPI 5.1. MPIDR is the CPU hardware ID as local APIC ID on x86 platform, so we use MPIDR not the GIC CPU interface ID to identify CPUs. Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org> --- arch/arm64/include/asm/acpi.h | 14 ++++++++++++++ arch/arm64/kernel/acpi.c | 21 ++++++++++++++++++++- drivers/acpi/processor_core.c | 37 +++++++++++++++++++++++++++++++++++++ 3 files changed, 71 insertions(+), 1 deletion(-)