@@ -1185,7 +1185,7 @@ static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
/* set enclosure management message type */
if (ap->flags & ATA_FLAG_EM)
- ap->em_message_type = ahci_em_messages;
+ ap->em_message_type = hpriv->em_msg_type;
/* disabled/not-implemented port */
@@ -220,13 +220,16 @@ enum {
ICH_MAP = 0x90, /* ICH MAP register */
/* em constants */
- EM_MAX_SLOTS = 8,
- EM_MAX_RETRY = 5,
+ EM_MAX_SLOTS = 8,
+ EM_MAX_RETRY = 5,
/* em_ctl bits */
- EM_CTL_RST = (1 << 9), /* Reset */
- EM_CTL_TM = (1 << 8), /* Transmit Message */
- EM_CTL_ALHD = (1 << 26), /* Activity LED */
+ EM_CTL_RST = (1 << 9), /* Reset */
+ EM_CTL_TM = (1 << 8), /* Transmit Message */
+ EM_CTL_MR = (1 << 0), /* Message Recieved */
+ EM_CTL_ALHD = (1 << 26), /* Activity LED */
+ EM_CTL_XMT = (1 << 25), /* Transmit Only */
+ EM_CTL_SMB = (1 << 24), /* Single Message Buffer */
};
struct ahci_cmd_hdr {
@@ -282,9 +285,10 @@ struct ahci_host_priv {
u32 saved_cap2; /* saved initial cap2 */
u32 saved_port_map; /* saved initial port_map */
u32 em_loc; /* enclosure management location */
+ u32 em_buf_sz; /* EM buffer size in byte*/
+ u32 em_msg_type; /* EM message type */
};
-extern int ahci_em_messages;
extern int ahci_ignore_sss;
extern struct scsi_host_template ahci_sht;
@@ -108,11 +108,18 @@ 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);
+static ssize_t ahci_read_em_buffer(struct device *dev,
+ struct device_attribute *attr, char *buf);
+static ssize_t ahci_store_em_buffer(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t size);
static DEVICE_ATTR(ahci_host_caps, S_IRUGO, ahci_show_host_caps, NULL);
static DEVICE_ATTR(ahci_host_cap2, S_IRUGO, ahci_show_host_cap2, NULL);
static DEVICE_ATTR(ahci_host_version, S_IRUGO, ahci_show_host_version, NULL);
static DEVICE_ATTR(ahci_port_cmd, S_IRUGO, ahci_show_port_cmd, NULL);
+static DEVICE_ATTR(em_buffer, S_IWUSR | S_IRUGO,
+ ahci_read_em_buffer, ahci_store_em_buffer);
static struct device_attribute *ahci_shost_attrs[] = {
&dev_attr_link_power_management_policy,
@@ -122,6 +129,7 @@ static struct device_attribute *ahci_shost_attrs[] = {
&dev_attr_ahci_host_cap2,
&dev_attr_ahci_host_version,
&dev_attr_ahci_port_cmd,
+ &dev_attr_em_buffer,
NULL
};
@@ -184,7 +192,7 @@ EXPORT_SYMBOL_GPL(ahci_em_messages);
module_param(ahci_em_messages, int, 0444);
/* add other LED protocol types when they become supported */
MODULE_PARM_DESC(ahci_em_messages,
- "Set AHCI Enclosure Management Message type (0 = disabled, 1 = LED");
+ "AHCI Enclosure Management Message control (0 = off, 1 = on)");
static void ahci_enable_ahci(void __iomem *mmio)
{
@@ -252,6 +260,83 @@ static ssize_t ahci_show_port_cmd(struct device *dev,
return sprintf(buf, "%x\n", readl(port_mmio + PORT_CMD));
}
+static ssize_t ahci_read_em_buffer(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;
+ void __iomem *mmio = hpriv->mmio;
+ void __iomem *em_mmio = mmio + hpriv->em_loc;
+ u32 em_ctl, msg;
+ unsigned long flags;
+ int i;
+
+ spin_lock_irqsave(ap->lock, flags);
+
+ em_ctl = readl(mmio + HOST_EM_CTL);
+ if (!(ap->flags & ATA_FLAG_EM) || em_ctl & EM_CTL_XMT ||
+ !(em_ctl & EM_CTL_MR)) {
+ spin_unlock_irqrestore(ap->lock, flags);
+ return -EINVAL;
+ }
+
+ if (!(em_ctl & EM_CTL_SMB))
+ em_mmio += hpriv->em_buf_sz;
+
+ for (i = 0; i < hpriv->em_buf_sz; i += 4) {
+ msg = readl(em_mmio + i);
+ buf[i] = msg & 0xff;
+ buf[i + 1] = (msg >> 8) & 0xff;
+ buf[i + 2] = (msg >> 16) & 0xff;
+ buf[i + 3] = (msg >> 24) & 0xff;
+ }
+
+ spin_unlock_irqrestore(ap->lock, flags);
+
+ return i;Add "em_buffer" attribute for SATA AHCI hosts to provide a way for
userland to access AHCI EM (enclosure management) buffer directly if the
host supports EM.
AHCI driver should support SGPIO EM messages. However the SATA/AHCI
specs did not define the SGPIO message format filled in EM buffer.
Different HW vendors may have different definitions. The mainly purpose
of this attribute is to solve this issue by allowing HW vendors to
provide userland drivers and tools for their SGPIO initiators.
Signed-off-by: Harry Zhang <harry.zhang@am
+}
+
+static ssize_t ahci_store_em_buffer(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t size)
+{
+ 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;
+ void __iomem *mmio = hpriv->mmio;
+ void __iomem *em_mmio = mmio + hpriv->em_loc;
+ u32 em_ctl, msg;
+ unsigned long flags;
+ int i;
+
+ /* check size validity */
+ if (!(ap->flags & ATA_FLAG_EM) || size % 4 ||
+ size > hpriv->em_buf_sz) {
+ return -EINVAL;
+ }
+
+ spin_lock_irqsave(ap->lock, flags);
+
+ em_ctl = readl(mmio + HOST_EM_CTL);
+ if (em_ctl & EM_CTL_TM) {
+ spin_unlock_irqrestore(ap->lock, flags);
+ return -EBUSY;
+ }
+
+ for (i = 0; i < size; i += 4) {
+ msg = buf[i] | buf[i + 1] << 8 | buf[i + 2] << 16 |
+ buf[i + 3] << 24;
+ writel(msg, em_mmio + i);
+ }
+