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@xxxxxxxxxxxxx> --- 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