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ata: ahci: Add sysfs attribute to show remapped NVMe device count 

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>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Kai-Heng Feng 2020-02-07 18:00:16 +08:00 committed by Jens Axboe
parent 3aadcf8382
commit 894fba7f43
2 changed files with 25 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
drivers/ata/ahci.c
View File

@ -1495,7 +1495,7 @@ 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;
/*
@ -1516,13 +1516,14 @@ 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");
@ -1642,6 +1643,18 @@ 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;
@ -1745,6 +1758,10 @@ 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;
@ -1896,6 +1913,9 @@ 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);
}

1
drivers/ata/ahci.h
View File

@ -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 */