linux-kernel - Re: [PATCH v3 1/2] soc: qcom: smp2p: Add irqchip state support

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Message-ID: <52d01bf9-2d73-4a7a-a734-2330bc426bd7@oss.qualcomm.com>
Date: Thu, 29 Jan 2026 16:26:38 +0530
From: Deepak Kumar Singh <deepak.singh@....qualcomm.com>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-remoteproc@...r.kernel.org,
        Chris Lew <chris.lew@....qualcomm.com>
Subject: Re: [PATCH v3 1/2] soc: qcom: smp2p: Add irqchip state support


On 1/27/2026 6:25 PM, Konrad Dybcio wrote:
> On 1/27/26 11:38 AM, Deepak Kumar Singh wrote:
>> From: Chris Lew <chris.lew@....qualcomm.com>
>>
>> A remoteproc booted during earlier boot stages such as UEFI or the
>> bootloader, may need to be attached to without restarting the remoteproc
>> hardware. To do this the remoteproc will need to check the ready and
>> handover states in smp2p without an interrupt notification. Create
>> qcom_smp2p_start_in() to initialize the shadow state without notifying
>> clients because these early events happened in the past.
>>
>> Add support for the .irq_get_irqchip_state callback so remoteproc can
>> read the current state of the fatal, ready and handover bits.
>>
>> Signed-off-by: Chris Lew <chris.lew@....qualcomm.com>
>> Signed-off-by: Deepak Kumar Singh <deepak.singh@....qualcomm.com>
>> ---
>>   drivers/soc/qcom/smp2p.c | 55 ++++++++++++++++++++++++++++++++++++++++++++++++
>>   1 file changed, 55 insertions(+)
>>
>> diff --git a/drivers/soc/qcom/smp2p.c b/drivers/soc/qcom/smp2p.c
>> index cb515c2340c1..c27ffb44b825 100644
>> --- a/drivers/soc/qcom/smp2p.c
>> +++ b/drivers/soc/qcom/smp2p.c
>> @@ -222,6 +222,39 @@ static void qcom_smp2p_negotiate(struct qcom_smp2p *smp2p)
>>   	}
>>   }
>>   
>> +static void qcom_smp2p_start_in(struct qcom_smp2p *smp2p)
>> +{
>> +	unsigned int smem_id = smp2p->smem_items[SMP2P_INBOUND];
>> +	unsigned int pid = smp2p->remote_pid;
>> +	char buf[SMP2P_MAX_ENTRY_NAME];
>> +	struct smp2p_smem_item *in;
>> +	struct smp2p_entry *entry;
>> +	size_t size;
>> +	int i;
>> +
>> +	in = qcom_smem_get(pid, smem_id, &size);
>> +	if (IS_ERR(in))
>> +		return;
>> +
>> +	smp2p->in = in;
>> +
>> +	/* Check if version is initialized by the remote. */
>> +	if (in->version == 0)
>> +		return;
>> +
>> +	for (i = smp2p->valid_entries; i < in->valid_entries; i++) {
>> +		list_for_each_entry(entry, &smp2p->inbound, node) {
>> +			memcpy(buf, in->entries[i].name, sizeof(buf));
> Is there a reason for this copy at all?
I don't see a compelling reason. This code snippet is same as present in 
qcom_smp2p_notify_in().
> [...]
>
>> +	/* Check inbound entries in the case of early boot processor */
> "in case a remote processor has already been started"?
This i can update in case new patch set is required.
> Konrad
>