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SubjectRe: [PATCH] ata: ahci: Add sysfs attribute to show remapped NVMe device count
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Hi Jens,

> On Feb 20, 2020, at 13:45, Kai-Heng Feng <kai.heng.feng@canonical.com> wrote:
>
>
>> On Feb 7, 2020, at 18:00, Kai-Heng Feng <kai.heng.feng@canonical.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@canonical.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
>>
>

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