1 files changed, 44 insertions, 0 deletions

diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 7a3124a9abc6..be4c39f8ab81 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -329,10 +329,24 @@ static ssize_t ahci_activity_store(struct ata_device *dev,
                                    enum sw_activity val);
 static void ahci_init_sw_activity(struct ata_link *link);
 
+static ssize_t ahci_show_host_caps(struct device *dev,
+                                   struct device_attribute *attr, char *buf);
+static ssize_t ahci_show_host_version(struct device *dev,
+                                      struct device_attribute *attr, char *buf);
+static ssize_t ahci_show_port_cmd(struct device *dev,
+                                  struct device_attribute *attr, char *buf);
+
+DEVICE_ATTR(ahci_host_caps, S_IRUGO, ahci_show_host_caps, NULL);
+DEVICE_ATTR(ahci_host_version, S_IRUGO, ahci_show_host_version, NULL);
+DEVICE_ATTR(ahci_port_cmd, S_IRUGO, ahci_show_port_cmd, NULL);
+
 static struct device_attribute *ahci_shost_attrs[] = {
         &dev_attr_link_power_management_policy,
         &dev_attr_em_message_type,
         &dev_attr_em_message,
+        &dev_attr_ahci_host_caps,
+        &dev_attr_ahci_host_version,
+        &dev_attr_ahci_port_cmd,
         NULL
 };
 
@@ -702,6 +716,36 @@ static void ahci_enable_ahci(void __iomem *mmio)
         WARN_ON(1);
 }
 
+static ssize_t ahci_show_host_caps(struct device *dev,
+                                   struct device_attribute *attr, char *buf)
+{
+        struct Scsi_Host *shost = class_to_shost(dev);
+        struct ata_port *ap = ata_shost_to_port(shost);
+        struct ahci_host_priv *hpriv = ap->host->private_data;
+
+        return sprintf(buf, "%x\n", hpriv->cap);
+}
+
+static ssize_t ahci_show_host_version(struct device *dev,
+                                   struct device_attribute *attr, char *buf)
+{
+        struct Scsi_Host *shost = class_to_shost(dev);
+        struct ata_port *ap = ata_shost_to_port(shost);
+        void __iomem *mmio = ap->host->iomap[AHCI_PCI_BAR];
+
+        return sprintf(buf, "%x\n", readl(mmio + HOST_VERSION));
+}
+
+static ssize_t ahci_show_port_cmd(struct device *dev,
+                                  struct device_attribute *attr, char *buf)
+{
+        struct Scsi_Host *shost = class_to_shost(dev);
+        struct ata_port *ap = ata_shost_to_port(shost);
+        void __iomem *port_mmio = ahci_port_base(ap);
+
+        return sprintf(buf, "%x\n", readl(port_mmio + PORT_CMD));
+}
+
 /**
  *      ahci_save_initial_config - Save and fixup initial config values
  *      @pdev: target PCI device