From: "lihuisong (C)" <lihuisong@huawei.com>
To: Sudeep Holla <sudeep.holla@arm.com>
Cc: <robbiek@xsightlabs.com>, <linux-acpi@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <rafael@kernel.org>,
<rafael.j.wysocki@intel.com>, <wanghuiqiang@huawei.com>,
<zhangzekun11@huawei.com>, <wangxiongfeng2@huawei.com>,
<tanxiaofei@huawei.com>, <guohanjun@huawei.com>,
<xiexiuqi@huawei.com>, <wangkefeng.wang@huawei.com>,
<huangdaode@huawei.com>, <lihuisong@huawei.com>
Subject: Re: [PATCH 1/2] mailbox: pcc: Add processing platform notification for slave subspaces
Date: Sat, 4 Mar 2023 17:49:44 +0800 [thread overview]
Message-ID: <1a7affec-a1df-a8d8-d5a4-68e19519bee8@huawei.com> (raw)
In-Reply-To: <20230303110745.3c6kihwxkd2i7iwh@bogus>
在 2023/3/3 19:07, Sudeep Holla 写道:
> On Fri, Mar 03, 2023 at 09:50:00AM +0800, lihuisong (C) wrote:
>> 在 2023/3/2 21:52, Sudeep Holla 写道:
>>> On Thu, Mar 02, 2023 at 09:57:35AM +0800, lihuisong (C) wrote:
>>>> 在 2023/3/1 21:24, Sudeep Holla 写道:
>>> [...]
>>>
>>>>> +static bool pcc_mbox_cmd_complete_check(struct pcc_chan_info *pchan)
>>>>> +{
>>>>> + u64 val;
>>>>> + int ret;
>>>>> +
>>>>> + ret = pcc_chan_reg_read(&pchan->cmd_complete, &val);
>>>>> + if (ret)
>>>>> + return false;
>>>>> +
>>>> we indeed already check if cmd_complete register is exist.
>>>> IMO, it can simply the code logic and reduce the risk of problems if we
>>>> return true here for the type without this register.
>>>> what do you think?
>>>>
>>> IIUC, your concern is about returning true for type 4 when the register
>>> doesn't exist, right ?
>> Return true in advance for the type without the cmd_complete register.
>> If support the register, we judge if the channel should respond the
>> interrupt based on the value of cmd_complete, like bellow.
> Right, sorry for missing that.
>
>> -->8
>> +static bool pcc_mbox_cmd_complete_check(struct pcc_chan_info *pchan)
>> +{
>> + u64 val;
>> + int ret;
>> +
>> + ret = pcc_chan_reg_read(&pchan->cmd_complete, &val);
>> + if (ret)
>> + return false;
>> +
>> + if (!pchan->cmd_complete.gas)
>> + return true;
>> +
> Yes we need the above check.
>
>> + /*
>> + * Judge if the channel respond the interrupt based on the value of
>> + * command complete.
>> + */
>> + val &= pchan->cmd_complete.status_mask;
>> + /*
>> + * If this is PCC slave subspace channel, then the command complete
>> + * bit 0 indicates that Platform is sending a notification and OSPM
>> + * needs to respond this interrupt to process this command.
>> + */
>> + if (pchan->type == ACPI_PCCT_TYPE_EXT_PCC_SLAVE_SUBSPACE)
>> + return !val;
>> + else
>> + return !!val;
>> +}
>>> I am saying it won't happen as we bail out if there is no GAS register
>>> from pcc_chan_reg_init(). Or am I missing something here ?
>> Yes, what you say is also ok. Just wondering if it is better to simply the
>> logic.
> Understood now.
>
>>>>> + val &= pchan->cmd_complete.status_mask;
>>>>> +
>>>>> + /*
>>>>> + * If this is PCC slave subspace channel, then the command complete
>>>>> + * bit 0 indicates that Platform is sending a notification and OSPM
>>>>> + * needs to respond this interrupt to process this command.
>>>>> + */
>>>>> + if (pchan->type == ACPI_PCCT_TYPE_EXT_PCC_SLAVE_SUBSPACE)
>>>>> + return !val;
>>>>> + else
>>>>> + return !!val;
>>>> This else branch is not applicable to type 3. type 3 will cannot respond
>>>> interrupt.
>>> Sorry I don't understand what you mean by that.
>> Sorry for my mistake.
>> I meant that the type2 channel always return false in this function and
>> never respond the interrupt if no check for the GAS register.
>> Because the 'val' for the type without the register is zero.
> Agreed as mentioned above, we need to bail out with true return if no GAS is
> found.
>
Ok, I will fix it as mentioned above.
>
> .
next prev parent reply other threads:[~2023-03-04 9:49 UTC|newest]
Thread overview: 89+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-16 3:40 [RFC] ACPI: PCC: Support shared interrupt for multiple subspaces Huisong Li
2022-10-26 6:10 ` lihuisong (C)
2022-10-27 11:10 ` Sudeep Holla
2022-10-27 12:48 ` lihuisong (C)
2022-10-27 15:53 ` Sudeep Holla
2022-10-28 7:55 ` lihuisong (C)
2022-10-31 10:40 ` Sudeep Holla
2022-11-01 2:49 ` lihuisong (C)
2022-11-04 15:04 ` Robbie King
2022-11-04 15:15 ` Sudeep Holla
2022-11-04 15:39 ` Robbie King
2022-11-07 6:24 ` lihuisong (C)
2022-11-17 18:09 ` Robbie King
2022-11-19 7:32 ` lihuisong (C)
2022-11-21 16:59 ` Robbie King
2022-11-22 3:42 ` lihuisong (C)
2022-11-22 3:30 ` [RFC V2] " Huisong Li
2022-11-22 13:46 ` Sudeep Holla
2022-11-23 3:36 ` lihuisong (C)
2022-12-03 9:51 ` [RFC-V3 0/2] mailbox: pcc: Support platform notification for type4 and shared interrupt Huisong Li
2022-12-03 9:51 ` [RFC-V3 1/2] mailbox: pcc: Add processing platform notification for slave subspaces Huisong Li
2023-02-06 15:39 ` Sudeep Holla
2023-02-07 2:27 ` lihuisong (C)
2023-02-13 21:18 ` Robbie King
2023-02-14 1:24 ` lihuisong (C)
2022-12-03 9:51 ` [RFC-V3 2/2] mailbox: pcc: Support shared interrupt for multiple subspaces Huisong Li
2022-12-14 2:57 ` [RFC-V3 0/2] mailbox: pcc: Support platform notification for type4 and shared interrupt lihuisong (C)
2022-12-30 1:07 ` lihuisong (C)
2023-01-04 11:06 ` Sudeep Holla
2023-01-05 1:14 ` lihuisong (C)
2023-01-28 1:49 ` lihuisong (C)
2023-02-16 6:36 ` [PATCH " Huisong Li
2023-02-16 6:36 ` [PATCH 1/2] mailbox: pcc: Add processing platform notification for slave subspaces Huisong Li
2023-03-01 13:24 ` Sudeep Holla
2023-03-02 1:57 ` lihuisong (C)
2023-03-02 13:52 ` Sudeep Holla
2023-03-03 1:50 ` lihuisong (C)
2023-03-03 11:07 ` Sudeep Holla
2023-03-04 9:49 ` lihuisong (C) [this message]
2023-02-16 6:36 ` [PATCH 2/2] mailbox: pcc: Support shared interrupt for multiple subspaces Huisong Li
2023-03-01 13:36 ` Sudeep Holla
2023-03-02 2:17 ` lihuisong (C)
2023-03-02 14:02 ` Sudeep Holla
[not found] ` <020cc964-9938-7ebe-7514-125cd041bfcb@huawei.com>
2023-03-03 11:14 ` Sudeep Holla
2023-03-04 9:47 ` lihuisong (C)
2023-03-10 20:14 ` Sudeep Holla
2023-03-14 1:05 ` lihuisong (C)
2023-02-27 13:09 ` [PATCH 0/2] mailbox: pcc: Support platform notification for type4 and shared interrupt lihuisong (C)
2023-03-14 11:11 ` [PATCH v2 " Huisong Li
2023-03-14 11:11 ` [PATCH v2 1/2] mailbox: pcc: Add support for platform notification handling Huisong Li
2023-03-27 11:30 ` Sudeep Holla
2023-03-27 12:25 ` lihuisong (C)
2023-03-27 13:27 ` Sudeep Holla
2023-03-14 11:11 ` [PATCH v2 2/2] mailbox: pcc: Support shared interrupt for multiple subspaces Huisong Li
2023-03-24 2:30 ` [PATCH v2 0/2] mailbox: pcc: Support platform notification for type4 and shared interrupt lihuisong (C)
2023-03-27 11:33 ` Sudeep Holla
2023-03-27 12:31 ` lihuisong (C)
2023-04-10 1:26 ` lihuisong (C)
2023-04-11 14:47 ` Robbie King
2023-04-14 1:05 ` lihuisong (C)
2023-04-14 13:48 ` Robbie King
2023-04-18 2:21 ` lihuisong (C)
2023-04-21 10:55 ` Sudeep Holla
2023-04-23 3:58 ` lihuisong (C)
2023-04-25 13:22 ` lihuisong (C)
2023-04-23 11:03 ` [PATCH v3 " Huisong Li
2023-04-23 11:03 ` [PATCH v3 1/2] mailbox: pcc: Add support for platform notification handling Huisong Li
2023-04-23 11:03 ` [PATCH v3 2/2] mailbox: pcc: Support shared interrupt for multiple subspaces Huisong Li
2023-04-25 14:41 ` [PATCH v3 0/2] mailbox: pcc: Support platform notification for type4 and shared interrupt Sudeep Holla
2023-05-25 12:25 ` lihuisong (C)
2023-05-04 1:30 ` lihuisong (C)
2023-05-09 9:06 ` Sudeep Holla
2023-06-13 12:57 ` [PATCH v4 " Huisong Li
2023-06-13 12:57 ` [PATCH v4 1/2] mailbox: pcc: Add support for platform notification handling Huisong Li
2023-06-13 12:57 ` [PATCH v4 2/2] mailbox: pcc: Support shared interrupt for multiple subspaces Huisong Li
2023-06-14 15:58 ` [PATCH v4 0/2] mailbox: pcc: Support platform notification for type4 and shared interrupt Sudeep Holla
2023-07-14 6:39 ` lihuisong (C)
2023-07-21 12:31 ` lihuisong (C)
2023-06-15 1:58 ` Hanjun Guo
2023-08-01 6:38 ` [PATCH RESEND " Huisong Li
2023-08-01 6:38 ` [PATCH RESEND v4 1/2] mailbox: pcc: Add support for platform notification handling Huisong Li
2023-08-01 6:38 ` [PATCH RESEND v4 2/2] mailbox: pcc: Support shared interrupt for multiple subspaces Huisong Li
2023-08-01 9:38 ` [PATCH RESEND v4 0/2] mailbox: pcc: Support platform notification for type4 and shared interrupt Sudeep Holla
2023-08-09 11:44 ` lihuisong (C)
2023-08-17 6:50 ` lihuisong (C)
2023-08-26 2:40 ` lihuisong (C)
[not found] ` <AS8P193MB233566815E722D9B3B13B5EECAE2A@AS8P193MB2335.EURP193.PROD.OUTLOOK.COM>
2023-08-28 1:03 ` lihuisong (C)
2023-08-29 9:55 ` Sudeep Holla
2023-09-21 13:52 ` Sudeep Holla
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