linux-kernel - Re: [PATCH RESEND] nvme-pci: refresh visible attrs after being checked

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Message-ID: <f0b5481c-2a0f-4343-80ed-8e7e1f081767@igalia.com>
Date: Fri, 13 Jun 2025 16:24:23 -0300
From: André Almeida <andrealmeid@...lia.com>
To: Keith Busch <kbusch@...nel.org>, Jens Axboe <axboe@...nel.dk>,
 Christoph Hellwig <hch@....de>, Sagi Grimberg <sagi@...mberg.me>,
 Chaitanya Kulkarni <kch@...dia.com>, linux-nvme@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org, kernel-dev@...lia.com,
 Eugen Hristev <eugen.hristev@...aro.org>
Subject: Re: [PATCH RESEND] nvme-pci: refresh visible attrs after being
 checked

+CC current Eugen mail address

Em 13/06/2025 16:21, André Almeida escreveu:
> From: Eugen Hristev <eugen.hristev@...labora.com>
> 
> The sysfs attributes are registered early, but the driver does not
> know whether they are needed or not at that moment.
> For the cmb attributes, commit
> e917a849c3fc ("nvme-pci: refresh visible attrs for cmb attributes")
> solved this problem by calling `nvme_update_attrs` after mapping the cmb.
> However the issue persists for the hmb attributes.
> To solve the problem, moved the call to `nvme_update_attrs` after
> `nvme_setup_host_mem` is called, the one that sets up the hmb, in probe
> and in reset_work functions.
> 
> Fixes: e917a849c3fc ("nvme-pci: refresh visible attrs for cmb attributes")
> Fixes: 86adbf0cdb9e ("nvme: simplify transport specific device attribute handling")
> Signed-off-by: Eugen Hristev <eugen.hristev@...labora.com>
> Reviewed-by: Christoph Hellwig <hch@....de>
> Signed-off-by: André Almeida <andrealmeid@...lia.com>
> ---
> This commit was reviewed a long time ago but was never merged. This is
> just a resend rebased on top of v6.16-rc1.
> 
> v1: https://lore.kernel.org/lkml/01020191b7b7adc0-bca16d06-b051-4ce2-bfee-c8038a62462f-000000@eu-west-1.amazonses.com/
> ---
>   drivers/nvme/host/pci.c | 6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
> index 8ff12e415cb5..320aaa41ec39 100644
> --- a/drivers/nvme/host/pci.c
> +++ b/drivers/nvme/host/pci.c
> @@ -2101,8 +2101,6 @@ static void nvme_map_cmb(struct nvme_dev *dev)
>   	if ((dev->cmbsz & (NVME_CMBSZ_WDS | NVME_CMBSZ_RDS)) ==
>   			(NVME_CMBSZ_WDS | NVME_CMBSZ_RDS))
>   		pci_p2pmem_publish(pdev, true);
> -
> -	nvme_update_attrs(dev);
>   }
>   
>   static int nvme_set_host_mem(struct nvme_dev *dev, u32 bits)
> @@ -3010,6 +3008,8 @@ static void nvme_reset_work(struct work_struct *work)
>   	if (result < 0)
>   		goto out;
>   
> +	nvme_update_attrs(dev);
> +
>   	result = nvme_setup_io_queues(dev);
>   	if (result)
>   		goto out;
> @@ -3343,6 +3343,8 @@ static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>   	if (result < 0)
>   		goto out_disable;
>   
> +	nvme_update_attrs(dev);
> +
>   	result = nvme_setup_io_queues(dev);
>   	if (result)
>   		goto out_disable;