linux-kernel - Re: [PATCH] ata: ahci: Add sysfs attribute to show remapped NVMe device count

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Message-Id: <C378B48F-FA41-4ED2-9B94-1E3102C75136@canonical.com>
Date:   Tue, 7 Apr 2020 14:08:12 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     anthony.wong@...onical.com,
        "open list:LIBATA SUBSYSTEM (Serial and Parallel ATA drivers)" 
        <linux-ide@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ata: ahci: Add sysfs attribute to show remapped NVMe
 device count

Hi Jens,

> On Feb 20, 2020, at 13:45, Kai-Heng Feng <kai.heng.feng@...onical.com> wrote:
> 
> 
>> On Feb 7, 2020, at 18:00, Kai-Heng Feng <kai.heng.feng@...onical.com> wrote:
>> 
>> Add a new sysfs attribute to show how many NVMe devices are remapped.
>> 
>> Userspace like distro installer can use this info to ask user to change
>> the BIOS setting.
>> 
>> Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
> 
> A gentle ping...

Any improvement I can make for this patch?

Kai-Heng

> 
>> ---
>> drivers/ata/ahci.c | 28 ++++++++++++++++++++++++----
>> drivers/ata/ahci.h |  1 +
>> 2 files changed, 25 insertions(+), 4 deletions(-)
>> 
>> diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
>> index 11ea1aff40db..cdbd995a7a6b 100644
>> --- a/drivers/ata/ahci.c
>> +++ b/drivers/ata/ahci.c
>> @@ -1488,7 +1488,7 @@ static irqreturn_t ahci_thunderx_irq_handler(int irq, void *dev_instance)
>> static void ahci_remap_check(struct pci_dev *pdev, int bar,
>> 		struct ahci_host_priv *hpriv)
>> {
>> -	int i, count = 0;
>> +	int i;
>> 	u32 cap;
>> 
>> 	/*
>> @@ -1509,13 +1509,14 @@ static void ahci_remap_check(struct pci_dev *pdev, int bar,
>> 			continue;
>> 
>> 		/* We've found a remapped device */
>> -		count++;
>> +		hpriv->remapped_nvme++;
>> 	}
>> 
>> -	if (!count)
>> +	if (!hpriv->remapped_nvme)
>> 		return;
>> 
>> -	dev_warn(&pdev->dev, "Found %d remapped NVMe devices.\n", count);
>> +	dev_warn(&pdev->dev, "Found %u remapped NVMe devices.\n",
>> +		 hpriv->remapped_nvme);
>> 	dev_warn(&pdev->dev,
>> 		 "Switch your BIOS from RAID to AHCI mode to use them.\n");
>> 
>> @@ -1635,6 +1636,18 @@ static void ahci_intel_pcs_quirk(struct pci_dev *pdev, struct ahci_host_priv *hp
>> 	}
>> }
>> 
>> +static ssize_t remapped_nvme_show(struct device *dev,
>> +				  struct device_attribute *attr,
>> +				  char *buf)
>> +{
>> +	struct ata_host *host = dev_get_drvdata(dev);
>> +	struct ahci_host_priv *hpriv = host->private_data;
>> +
>> +	return sprintf(buf, "%u\n", hpriv->remapped_nvme);
>> +}
>> +
>> +static DEVICE_ATTR_RO(remapped_nvme);
>> +
>> static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
>> {
>> 	unsigned int board_id = ent->driver_data;
>> @@ -1735,6 +1748,10 @@ static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
>> 	/* detect remapped nvme devices */
>> 	ahci_remap_check(pdev, ahci_pci_bar, hpriv);
>> 
>> +	sysfs_add_file_to_group(&pdev->dev.kobj,
>> +				&dev_attr_remapped_nvme.attr,
>> +				NULL);
>> +
>> 	/* must set flag prior to save config in order to take effect */
>> 	if (ahci_broken_devslp(pdev))
>> 		hpriv->flags |= AHCI_HFLAG_NO_DEVSLP;
>> @@ -1886,6 +1903,9 @@ static void ahci_shutdown_one(struct pci_dev *pdev)
>> 
>> static void ahci_remove_one(struct pci_dev *pdev)
>> {
>> +	sysfs_remove_file_from_group(&pdev->dev.kobj,
>> +				     &dev_attr_remapped_nvme.attr,
>> +				     NULL);
>> 	pm_runtime_get_noresume(&pdev->dev);
>> 	ata_pci_remove_one(pdev);
>> }
>> diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h
>> index 3dbf398c92ea..d991dd46e89c 100644
>> --- a/drivers/ata/ahci.h
>> +++ b/drivers/ata/ahci.h
>> @@ -336,6 +336,7 @@ struct ahci_host_priv {
>> 	u32 			em_loc; /* enclosure management location */
>> 	u32			em_buf_sz;	/* EM buffer size in byte */
>> 	u32			em_msg_type;	/* EM message type */
>> +	u32			remapped_nvme;	/* NVMe remapped device count */
>> 	bool			got_runtime_pm; /* Did we do pm_runtime_get? */
>> 	struct clk		*clks[AHCI_MAX_CLKS]; /* Optional */
>> 	struct reset_control	*rsts;		/* Optional */
>> -- 
>> 2.17.1
>> 
>