[PATCH v9 02/12] ARM/ARM64: KVM: Add common header for PSCI related defines
Marc Zyngier
marc.zyngier at arm.com
Tue Apr 15 05:18:34 PDT 2014
On Tue, Apr 15 2014 at 12:10:30 pm BST, Anup Patel <anup at brainfault.org> wrote:
> On Tue, Apr 15, 2014 at 3:36 PM, Marc Zyngier <marc.zyngier at arm.com> wrote:
>> On Tue, Apr 15 2014 at 7:14:05 am BST, Anup Patel <anup.patel at linaro.org> wrote:
>>> We need a common place to share PSCI related defines among ARM kernel,
>>> ARM64 kernel, KVM ARM/ARM64 PSCI emulation, and user space.
>>>
>>> We introduce uapi/linux/psci.h for this purpose. This newly added
>>> header will be first used by KVM ARM/ARM64 in-kernel PSCI emulation
>>> and user space (i.e. QEMU or KVMTOOL).
>>>
>>> Signed-off-by: Anup Patel <anup.patel at linaro.org>
>>> Signed-off-by: Pranavkumar Sawargaonkar <pranavkumar at linaro.org>
>>> Signed-off-by: Ashwin Chaugule <ashwin.chaugule at linaro.org>
>>> ---
>>> include/uapi/linux/Kbuild | 1 +
>>> include/uapi/linux/psci.h | 78 +++++++++++++++++++++++++++++++++++++++++++++
>>> 2 files changed, 79 insertions(+)
>>> create mode 100644 include/uapi/linux/psci.h
>>>
>>> diff --git a/include/uapi/linux/Kbuild b/include/uapi/linux/Kbuild
>>> index 6929571..24e9033 100644
>>> --- a/include/uapi/linux/Kbuild
>>> +++ b/include/uapi/linux/Kbuild
>>> @@ -317,6 +317,7 @@ header-y += ppp-ioctl.h
>>> header-y += ppp_defs.h
>>> header-y += pps.h
>>> header-y += prctl.h
>>> +header-y += psci.h
>>> header-y += ptp_clock.h
>>> header-y += ptrace.h
>>> header-y += qnx4_fs.h
>>> diff --git a/include/uapi/linux/psci.h b/include/uapi/linux/psci.h
>>> new file mode 100644
>>> index 0000000..077b623
>>> --- /dev/null
>>> +++ b/include/uapi/linux/psci.h
>>> @@ -0,0 +1,78 @@
>>> +/*
>>> + * ARM Power State and Coordination Interface (PSCI) header
>>> + *
>>> + * This header holds common PSCI defines and macros shared
>>> + * by: ARM kernel, ARM64 kernel, KVM ARM/ARM64 and user space.
>>> + *
>>> + * Copyright (C) 2014 Linaro Ltd.
>>> + * Author: Anup Patel <anup.patel at linaro.org>
>>> + */
>>> +
>>> +#ifndef _UAPI_LINUX_PSCI_H
>>> +#define _UAPI_LINUX_PSCI_H
>>> +
>>> +/* PSCI v0.1 interface */
>>> +#define PSCI_FN(base, n) ((base) + (n))
>>> +
>>> +#define PSCI_FN_CPU_SUSPEND(base) PSCI_FN(base, 0)
>>> +#define PSCI_FN_CPU_OFF(base) PSCI_FN(base, 1)
>>> +#define PSCI_FN_CPU_ON(base) PSCI_FN(base, 2)
>>> +#define PSCI_FN_MIGRATE(base) PSCI_FN(base, 3)
>>
>> For PSCI v0.1, all the function numbers are independent (the spec didn't
>> specify any number...). You cannot assume contiguous numbering.
>
> This is more like KVM recommended function numbering for PSCI v0.1.
> We were already having it in uapi/asm/kvm.h to share between KVM and
> user space so I felt this to be better place for it.
>
> Do you want me to drop these or add some comment about PSCI v0.1
> function numbering ?
Both. Add a comment saying that v0.1 function numbering is
implementation defined, and remove these defines.
>
>>
>>> +/* PSCI v0.2 interface */
>>> +#define PSCI_0_2_FN_BASE 0x84000000
>>> +#define PSCI_0_2_FN(n) (PSCI_0_2_FN_BASE + (n))
>>> +#define PSCI_0_2_64BIT 0x40000000
>>> +#define PSCI_0_2_FN64_BASE \
>>> + (PSCI_0_2_FN_BASE + PSCI_0_2_64BIT)
>>> +#define PSCI_0_2_FN64(n) (PSCI_0_2_FN64_BASE + (n))
>>> +
>>> +#define PSCI_0_2_FN_PSCI_VERSION PSCI_0_2_FN(0)
>>> +#define PSCI_0_2_FN_CPU_SUSPEND PSCI_0_2_FN(1)
>>> +#define PSCI_0_2_FN_CPU_OFF PSCI_0_2_FN(2)
>>> +#define PSCI_0_2_FN_CPU_ON PSCI_0_2_FN(3)
>>> +#define PSCI_0_2_FN_AFFINITY_INFO PSCI_0_2_FN(4)
>>> +#define PSCI_0_2_FN_MIGRATE PSCI_0_2_FN(5)
>>> +#define PSCI_0_2_FN_MIGRATE_INFO_TYPE PSCI_0_2_FN(6)
>>> +#define PSCI_0_2_FN_MIGRATE_INFO_UP_CPU PSCI_0_2_FN(7)
>>> +#define PSCI_0_2_FN_SYSTEM_OFF PSCI_0_2_FN(8)
>>> +#define PSCI_0_2_FN_SYSTEM_RESET PSCI_0_2_FN(9)
>>> +
>>> +#define PSCI_0_2_FN64_CPU_SUSPEND PSCI_0_2_FN64(1)
>>> +#define PSCI_0_2_FN64_CPU_ON PSCI_0_2_FN64(3)
>>> +#define PSCI_0_2_FN64_AFFINITY_INFO PSCI_0_2_FN64(4)
>>> +#define PSCI_0_2_FN64_MIGRATE PSCI_0_2_FN64(5)
>>> +#define PSCI_0_2_FN64_MIGRATE_INFO_UP_CPU PSCI_0_2_FN64(7)
>>> +
>>> +#define PSCI_0_2_POWER_STATE_ID_MASK 0xffff
>>> +#define PSCI_0_2_POWER_STATE_ID_SHIFT 0
>>> +#define PSCI_0_2_POWER_STATE_TYPE_MASK 0x1
>>> +#define PSCI_0_2_POWER_STATE_TYPE_SHIFT 16
>>> +#define PSCI_0_2_POWER_STATE_AFFL_MASK 0x3
>>> +#define PSCI_0_2_POWER_STATE_AFFL_SHIFT 24
>>> +
>>> +#define PSCI_0_2_TOS_UP_MIGRATE 0
>>> +#define PSCI_0_2_TOS_UP_NO_MIGRATE 1
>>> +#define PSCI_0_2_TOS_MP 2
>>> +
>>> +/* PSCI version decoding (independent of PSCI version) */
>>> +#define PSCI_VERSION_MAJOR_MASK 0xffff0000
>>> +#define PSCI_VERSION_MINOR_MASK 0x0000ffff
>>> +#define PSCI_VERSION_MAJOR_SHIFT 16
>>
>> What about:
>>
>> #define PSCI_VERSION_MINOR_MASK ((1U << PSCI_VERSION_MAJOR_SHIFT) - 1)
>> #define PSCI_VERSION_MAJOR_MASK ~PSCI_VERSION_MINOR_MASK
>
> OK, I will update this.
Thanks,
M.
>>
>>> +#define PSCI_VERSION_MAJOR(ver) \
>>> + (((ver) & PSCI_VERSION_MAJOR_MASK) >> PSCI_VERSION_MAJOR_SHIFT)
>>> +#define PSCI_VERSION_MINOR(ver) \
>>> + ((ver) & PSCI_VERSION_MINOR_MASK)
>>> +
>>> +/* PSCI return values (inclusive of all PSCI versions) */
>>> +#define PSCI_RET_SUCCESS 0
>>> +#define PSCI_RET_NOT_SUPPORTED -1
>>> +#define PSCI_RET_INVALID_PARAMS -2
>>> +#define PSCI_RET_DENIED -3
>>> +#define PSCI_RET_ALREADY_ON -4
>>> +#define PSCI_RET_ON_PENDING -5
>>> +#define PSCI_RET_INTERNAL_FAILURE -6
>>> +#define PSCI_RET_NOT_PRESENT -7
>>> +#define PSCI_RET_DISABLED -8
>>> +
>>> +#endif /* _UAPI_LINUX_PSCI_H */
>>
>> --
>> Jazz is not dead. It just smells funny.
>> _______________________________________________
>> kvmarm mailing list
>> kvmarm at lists.cs.columbia.edu
>> https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
>
> --
> Anup
>
--
Jazz is not dead. It just smells funny.
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