linux-kernel - Re: [Intel-wired-lan] [PATCH] ice: irdma hardware init failed after suspend/resume

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Date: Fri, 31 May 2024 11:37:44 +0200
From: Wojciech Drewek <wojciech.drewek@...el.com>
To: En-Wei WU <en-wei.wu@...onical.com>, Paul Menzel <pmenzel@...gen.mpg.de>
CC: <netdev@...r.kernel.org>, <rickywu0421@...il.com>,
	<linux-kernel@...r.kernel.org>, <edumazet@...gle.com>,
	<anthony.l.nguyen@...el.com>, <kuba@...nel.org>,
	<intel-wired-lan@...ts.osuosl.org>, <pabeni@...hat.com>,
	<davem@...emloft.net>
Subject: Re: [Intel-wired-lan] [PATCH] ice: irdma hardware init failed after
 suspend/resume



On 30.05.2024 09:08, En-Wei WU wrote:
> Thank you for your reply.
> 
>> Sorry for being unclear. I meant, does resuming the system take longer
>> now? (initcall_debug might give a clue.)
> I've tested the S3 suspend/resume with the initcall_debug kernel
> command option, and it shows no clear difference between having or not
> having the ice_init_rdma in ice_resume:
> Without ice_init_rdma:
> ```
> [  104.241129] ice 0000:86:00.0: PM: pci_pm_resume+0x0/0x110 returned
> 0 after 9415 usecs
> [  104.241206] ice 0000:86:00.1: PM: pci_pm_resume+0x0/0x110 returned
> 0 after 9443 usecs
> ```
> With ice_init_rdma:
> ```
> [  122.749022] ice 0000:86:00.1: PM: pci_pm_resume+0x0/0x110 returned
> 0 after 9485 usecs
> [  122.749068] ice 0000:86:00.0: PM: pci_pm_resume+0x0/0x110 returned
> 0 after 9532 usecs
> ```
> 
>> And ice_init_rdma should be moved to ice_rebuild (replace ice_plug_aux_dev)
> We can defer the ice_init_rdma to the later service task by adopting this.
> 
>> You should call ice_deinit_rdma in ice_prepare_for_reset (replace ice_unplug_aux_dev),
> It seems like we must call ice_deinit_rdma in ice_suspend. If we call
> it in the later service task, it will:
> 1. break some existing code setup by ice_resume
> 2. Since the PCI-X vector table is flushed at the end of ice_suspend,
> we have no way to release PCI-X vectors for rdma if we had allocated
> it dynamically
> The second point is important since we didn't release the PCI-X
> vectors for rdma (if we allocated it dynamically) in the original
> ice_suspend, and it's somewhat like a leak in the original code.
> 
> Best regards,
> Ricky.

Makes sense, let's keep ice_deinit_rdma in ice_suspend.

> 
> On Thu, 30 May 2024 at 04:19, Paul Menzel <pmenzel@...gen.mpg.de> wrote:
>>
>> Dear En-Wei,
>>
>>
>> Thank you for responding so quickly.
>>
>> Am 29.05.24 um 05:17 schrieb En-Wei WU:
>>
>> […]
>>
>>>> What effect does this have on resume time?
>>>
>>> When we call ice_init_rdma() at resume time, it will allocate entries
>>> at pf->irq_tracker.entries and update pf->msix_entries for later use
>>> (request_irq) by irdma.
>>
>> Sorry for being unclear. I meant, does resuming the system take longer
>> now? (initcall_debug might give a clue.)
>>
>>
>> Kind regards,
>>
>> Paul