Re: 回复: [edk2-devel] [edk2-devel202105 PATCH v2 1/1] ArmPkg/ArmGic: Fix maximum number of interrupts in GICv3

["Laszlo Ersek" <lersek@redhat.com>]

Hi Liming,

On 05/27/21 04:32, gaoliming wrote:
> If no objection, I will merge this patch today. Then, tomorrow, I will create stable tag 202105. 

yes, please do that -- TBH, I thought Sami would merge it sooner, as
Sami does have maintainer access through DynamicTablesPkg and
StandaloneMmPkg.

Thanks!
Laszlo

> 
> Thanks
> Liming
>> -----邮件原件-----
>> 发件人: devel@edk2.groups.io <devel@edk2.groups.io> 代表 gaoliming
>> 发送时间: 2021年5月26日 10:22
>> 收件人: devel@edk2.groups.io; lersek@redhat.com;
>> sami.mujawar@arm.com
>> 抄送: ardb@kernel.org; leif@nuviainc.com; Matteo.Carlini@arm.com;
>> Andreas.Sandberg@arm.com; joey.gouly@arm.com; nd@arm.com
>> 主题: 回复: [edk2-devel] [edk2-devel202105 PATCH v2 1/1] ArmPkg/ArmGic:
>> Fix maximum number of interrupts in GICv3
>>
>> Laszlo, Ard, Sami:
>>   I am OK to merge this patch for stable tag 202105.
>>
>> Thanks
>> Liming
>>> -----邮件原件-----
>>> 发件人: devel@edk2.groups.io <devel@edk2.groups.io> 代表 Laszlo
>> Ersek
>>> 发送时间: 2021年5月25日 19:55
>>> 收件人: devel@edk2.groups.io; sami.mujawar@arm.com
>>> 抄送: ardb@kernel.org; leif@nuviainc.com; Matteo.Carlini@arm.com;
>>> Andreas.Sandberg@arm.com; joey.gouly@arm.com; nd@arm.com
>>> 主题: Re: [edk2-devel] [edk2-devel202105 PATCH v2 1/1] ArmPkg/ArmGic:
>>> Fix maximum number of interrupts in GICv3
>>>
>>> Hi Sami,
>>>
>>> On 05/24/21 15:01, Sami Mujawar wrote:
>>>> From: Andreas Sandberg <andreas.sandberg@arm.com>
>>>>
>>>> Bugzilla: 3415 (https://bugzilla.tianocore.org/show_bug.cgi?id=3415)
>>>>
>>>> The GICv3 architecture supports up to 1020 ordinary interrupt
>>>> lines. The actual number of interrupts supported is described by the
>>>> ITLinesNumber field in the GICD_TYPER register. The total number of
>>>> implemented registers is normally calculated as
>>>> 32*(ITLinesNumber+1). However, maximum value (0x1f) is a special case
>>>> since that would indicate that 1024 interrupts are implemented.
>>>>
>>>> Add handling for this special case in ArmGicGetMaxNumInterrupts.
>>>>
>>>> Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
>>>> Signed-off-by: Joey Gouly <joey.gouly@arm.com>
>>>> Signed-off-by: Sami Mujawar <sami.mujawar@arm.com>
>>>> Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
>>>> ---
>>>> The changes can be seen at:
>>>> https://github.com/samimujawar/edk2/tree/1396_gic_max_num_intr_v2
>>>>
>>>> Notes:
>>>>     v2:
>>>>       - Fix comment style.
>>> [Laszlo]
>>>>       - Updated comment style.
>>> [Sami]
>>>>
>>>>  ArmPkg/Drivers/ArmGic/ArmGicLib.c | 11 +++++++++--
>>>>  1 file changed, 9 insertions(+), 2 deletions(-)
>>>
>>> I think this patch should be merged really soon, as long as Ard agrees.
>>>
>>> Thanks,
>>> Laszlo
>>>
>>>>
>>>> diff --git a/ArmPkg/Drivers/ArmGic/ArmGicLib.c
>>> b/ArmPkg/Drivers/ArmGic/ArmGicLib.c
>>>> index
>>>
>> 6b01c88206ad8adef3100dd44c0d57660db77783..bd4b5edb903f3846f4f0e43
>>> 1f93e001f01cd9e7d 100644
>>>> --- a/ArmPkg/Drivers/ArmGic/ArmGicLib.c
>>>> +++ b/ArmPkg/Drivers/ArmGic/ArmGicLib.c
>>>> @@ -1,6 +1,6 @@
>>>>  /** @file
>>>>  *
>>>> -*  Copyright (c) 2011-2018, ARM Limited. All rights reserved.
>>>> +*  Copyright (c) 2011-2021, Arm Limited. All rights reserved.
>>>>  *
>>>>  *  SPDX-License-Identifier: BSD-2-Clause-Patent
>>>>  *
>>>> @@ -120,7 +120,14 @@ ArmGicGetMaxNumInterrupts (
>>>>    IN  INTN          GicDistributorBase
>>>>    )
>>>>  {
>>>> -  return 32 * ((MmioRead32 (GicDistributorBase + ARM_GIC_ICDICTR) &
>>> 0x1F) + 1);
>>>> +  UINTN ItLines;
>>>> +
>>>> +  ItLines = MmioRead32 (GicDistributorBase + ARM_GIC_ICDICTR) &
>>> 0x1F;
>>>> +
>>>> +  //
>>>> +  // Interrupt ID 1020-1023 are reserved.
>>>> +  //
>>>> +  return (ItLines == 0x1f) ? 1020 : 32 * (ItLines + 1);
>>>>  }
>>>>
>>>>  VOID
>>>>
>>>
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