cciss: add cciss driver sysfs entries

Add sysfs entries to the cciss driver needed for the dm/multipath tools.

A file for vendor, model, rev, and unique_id is added for each logical
drive under directory /sys/bus/pci/devices/<dev>/ccissX/cXdY.  Where X =
the controller (or host) number and Y is the logical drive number.

A link from /sys/bus/pci/devices/<dev>/ccissX/cXdY/block:cciss!cXdY to
/sys/block/cciss!cXdY/device is also created.  A bus is created in
/sys/bus/cciss.  A link is created from the pci ccissX entry to
/sys/bus/cciss/devices/ccissX.  Please consider this for inclusion.

Signed-off-by: Mike Miller <mike.miller@hp.com>
Cc: Stephen M. Cameron <scameron@beardog.cca.cpqcorp.net>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

2 files changed, 281 insertions, 10 deletions

diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index cb43fb3af159..e7d00952dd4f 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -437,6 +437,194 @@ static void __devinit cciss_procinit(int i)
 }
 #endif                          /* CONFIG_PROC_FS */
 
+#define MAX_PRODUCT_NAME_LEN 19
+
+#define to_hba(n) container_of(n, struct ctlr_info, dev)
+#define to_drv(n) container_of(n, drive_info_struct, dev)
+
+static struct device_type cciss_host_type = {
+        .name           = "cciss_host",
+};
+
+static ssize_t dev_show_unique_id(struct device *dev,
+                                 struct device_attribute *attr,
+                                 char *buf)
+{
+        drive_info_struct *drv = to_drv(dev);
+        struct ctlr_info *h = to_hba(drv->dev.parent);
+        __u8 sn[16];
+        unsigned long flags;
+        int ret = 0;
+
+        spin_lock_irqsave(CCISS_LOCK(h->ctlr), flags);
+        if (h->busy_configuring)
+                ret = -EBUSY;
+        else
+                memcpy(sn, drv->serial_no, sizeof(sn));
+        spin_unlock_irqrestore(CCISS_LOCK(h->ctlr), flags);
+
+        if (ret)
+                return ret;
+        else
+                return snprintf(buf, 16 * 2 + 2,
+                                "%02X%02X%02X%02X%02X%02X%02X%02X"
+                                "%02X%02X%02X%02X%02X%02X%02X%02X\n",
+                                sn[0], sn[1], sn[2], sn[3],
+                                sn[4], sn[5], sn[6], sn[7],
+                                sn[8], sn[9], sn[10], sn[11],
+                                sn[12], sn[13], sn[14], sn[15]);
+}
+DEVICE_ATTR(unique_id, S_IRUGO, dev_show_unique_id, NULL);
+
+static ssize_t dev_show_vendor(struct device *dev,
+                               struct device_attribute *attr,
+                               char *buf)
+{
+        drive_info_struct *drv = to_drv(dev);
+        struct ctlr_info *h = to_hba(drv->dev.parent);
+        char vendor[VENDOR_LEN + 1];
+        unsigned long flags;
+        int ret = 0;
+
+        spin_lock_irqsave(CCISS_LOCK(h->ctlr), flags);
+        if (h->busy_configuring)
+                ret = -EBUSY;
+        else
+                memcpy(vendor, drv->vendor, VENDOR_LEN + 1);
+        spin_unlock_irqrestore(CCISS_LOCK(h->ctlr), flags);
+
+        if (ret)
+                return ret;
+        else
+                return snprintf(buf, sizeof(vendor) + 1, "%s\n", drv->vendor);
+}
+DEVICE_ATTR(vendor, S_IRUGO, dev_show_vendor, NULL);
+
+static ssize_t dev_show_model(struct device *dev,
+                              struct device_attribute *attr,
+                              char *buf)
+{
+        drive_info_struct *drv = to_drv(dev);
+        struct ctlr_info *h = to_hba(drv->dev.parent);
+        char model[MODEL_LEN + 1];
+        unsigned long flags;
+        int ret = 0;
+
+        spin_lock_irqsave(CCISS_LOCK(h->ctlr), flags);
+        if (h->busy_configuring)
+                ret = -EBUSY;
+        else
+                memcpy(model, drv->model, MODEL_LEN + 1);
+        spin_unlock_irqrestore(CCISS_LOCK(h->ctlr), flags);
+
+        if (ret)
+                return ret;
+        else
+                return snprintf(buf, sizeof(model) + 1, "%s\n", drv->model);
+}
+DEVICE_ATTR(model, S_IRUGO, dev_show_model, NULL);
+
+static ssize_t dev_show_rev(struct device *dev,
+                            struct device_attribute *attr,
+                            char *buf)
+{
+        drive_info_struct *drv = to_drv(dev);
+        struct ctlr_info *h = to_hba(drv->dev.parent);
+        char rev[REV_LEN + 1];
+        unsigned long flags;
+        int ret = 0;
+
+        spin_lock_irqsave(CCISS_LOCK(h->ctlr), flags);
+        if (h->busy_configuring)
+                ret = -EBUSY;
+        else
+                memcpy(rev, drv->rev, REV_LEN + 1);
+        spin_unlock_irqrestore(CCISS_LOCK(h->ctlr), flags);
+
+        if (ret)
+                return ret;
+        else
+                return snprintf(buf, sizeof(rev) + 1, "%s\n", drv->rev);
+}
+DEVICE_ATTR(rev, S_IRUGO, dev_show_rev, NULL);
+
+static struct attribute *cciss_dev_attrs[] = {
+        &dev_attr_unique_id.attr,
+        &dev_attr_model.attr,
+        &dev_attr_vendor.attr,
+        &dev_attr_rev.attr,
+        NULL
+};
+
+static struct attribute_group cciss_dev_attr_group = {
+        .attrs = cciss_dev_attrs,
+};
+
+static struct attribute_group *cciss_dev_attr_groups[] = {
+        &cciss_dev_attr_group,
+        NULL
+};
+
+static struct device_type cciss_dev_type = {
+        .name           = "cciss_device",
+        .groups         = cciss_dev_attr_groups,
+};
+
+static struct bus_type cciss_bus_type = {
+        .name           = "cciss",
+};
+
+
+/*
+ * Initialize sysfs entry for each controller.  This sets up and registers
+ * the 'cciss#' directory for each individual controller under
+ * /sys/bus/pci/devices/<dev>/.
+ */
+static int cciss_create_hba_sysfs_entry(struct ctlr_info *h)
+{
+        device_initialize(&h->dev);
+        h->dev.type = &cciss_host_type;
+        h->dev.bus = &cciss_bus_type;
+        dev_set_name(&h->dev, "%s", h->devname);
+        h->dev.parent = &h->pdev->dev;
+
+        return device_add(&h->dev);
+}
+
+/*
+ * Remove sysfs entries for an hba.
+ */
+static void cciss_destroy_hba_sysfs_entry(struct ctlr_info *h)
+{
+        device_del(&h->dev);
+}
+
+/*
+ * Initialize sysfs for each logical drive.  This sets up and registers
+ * the 'c#d#' directory for each individual logical drive under
+ * /sys/bus/pci/devices/<dev/ccis#/. We also create a link from
+ * /sys/block/cciss!c#d# to this entry.
+ */
+static int cciss_create_ld_sysfs_entry(struct ctlr_info *h,
+                                       drive_info_struct *drv,
+                                       int drv_index)
+{
+        device_initialize(&drv->dev);
+        drv->dev.type = &cciss_dev_type;
+        drv->dev.bus = &cciss_bus_type;
+        dev_set_name(&drv->dev, "c%dd%d", h->ctlr, drv_index);
+        drv->dev.parent = &h->dev;
+        return device_add(&drv->dev);
+}
+
+/*
+ * Remove sysfs entries for a logical drive.
+ */
+static void cciss_destroy_ld_sysfs_entry(drive_info_struct *drv)
+{
+        device_del(&drv->dev);
+}
+
 /*
  * For operations that cannot sleep, a command block is allocated at init,
  * and managed by cmd_alloc() and cmd_free() using a simple bitmap to track
@@ -1332,6 +1520,45 @@ static void cciss_softirq_done(struct request *rq)
         spin_unlock_irqrestore(&h->lock, flags);
 }
 
+/* This function gets the SCSI vendor, model, and revision of a logical drive
+ * via the inquiry page 0.  Model, vendor, and rev are set to empty strings if
+ * they cannot be read.
+ */
+static void cciss_get_device_descr(int ctlr, int logvol, int withirq,
+                                   char *vendor, char *model, char *rev)
+{
+        int rc;
+        InquiryData_struct *inq_buf;
+
+        *vendor = '\0';
+        *model = '\0';
+        *rev = '\0';
+
+        inq_buf = kzalloc(sizeof(InquiryData_struct), GFP_KERNEL);
+        if (!inq_buf)
+                return;
+
+        if (withirq)
+                rc = sendcmd_withirq(CISS_INQUIRY, ctlr, inq_buf,
+                                     sizeof(InquiryData_struct), 1, logvol,
+                                     0, TYPE_CMD);
+        else
+                rc = sendcmd(CISS_INQUIRY, ctlr, inq_buf,
+                             sizeof(InquiryData_struct), 1, logvol, 0, NULL,
+                             TYPE_CMD);
+        if (rc == IO_OK) {
+                memcpy(vendor, &inq_buf->data_byte[8], VENDOR_LEN);
+                vendor[VENDOR_LEN] = '\0';
+                memcpy(model, &inq_buf->data_byte[16], MODEL_LEN);
+                model[MODEL_LEN] = '\0';
+                memcpy(rev, &inq_buf->data_byte[32], REV_LEN);
+                rev[REV_LEN] = '\0';
+        }
+
+        kfree(inq_buf);
+        return;
+}
+
 /* This function gets the serial number of a logical drive via
  * inquiry page 0x83.  Serial no. is 16 bytes.  If the serial
  * number cannot be had, for whatever reason, 16 bytes of 0xff
@@ -1372,7 +1599,7 @@ static void cciss_add_disk(ctlr_info_t *h, struct gendisk *disk,
         disk->first_minor = drv_index << NWD_SHIFT;
         disk->fops = &cciss_fops;
         disk->private_data = &h->drv[drv_index];
-        disk->driverfs_dev = &h->pdev->dev;
+        disk->driverfs_dev = &h->drv[drv_index].dev;
 
         /* Set up queue information */
         blk_queue_bounce_limit(disk->queue, h->pdev->dma_mask);
@@ -1463,6 +1690,8 @@ static void cciss_update_drive_info(int ctlr, int drv_index, int first_time)
         drvinfo->block_size = block_size;
         drvinfo->nr_blocks = total_size + 1;
 
+        cciss_get_device_descr(ctlr, drv_index, 1, drvinfo->vendor,
+                                drvinfo->model, drvinfo->rev);
         cciss_get_serial_no(ctlr, drv_index, 1, drvinfo->serial_no,
                         sizeof(drvinfo->serial_no));
 
@@ -1512,6 +1741,9 @@ static void cciss_update_drive_info(int ctlr, int drv_index, int first_time)
         h->drv[drv_index].cylinders = drvinfo->cylinders;
         h->drv[drv_index].raid_level = drvinfo->raid_level;
         memcpy(h->drv[drv_index].serial_no, drvinfo->serial_no, 16);
+        memcpy(h->drv[drv_index].vendor, drvinfo->vendor, VENDOR_LEN + 1);
+        memcpy(h->drv[drv_index].model, drvinfo->model, MODEL_LEN + 1);
+        memcpy(h->drv[drv_index].rev, drvinfo->rev, REV_LEN + 1);
 
         ++h->num_luns;
         disk = h->gendisk[drv_index];
@@ -1586,6 +1818,8 @@ static int cciss_add_gendisk(ctlr_info_t *h, __u32 lunid, int controller_node)
                 }
         }
         h->drv[drv_index].LunID = lunid;
+        if (cciss_create_ld_sysfs_entry(h, &h->drv[drv_index], drv_index))
+                goto err_free_disk;
 
         /* Don't need to mark this busy because nobody */
         /* else knows about this disk yet to contend */
@@ -1593,6 +1827,11 @@ static int cciss_add_gendisk(ctlr_info_t *h, __u32 lunid, int controller_node)
         h->drv[drv_index].busy_configuring = 0;
         wmb();
         return drv_index;
+
+err_free_disk:
+        put_disk(h->gendisk[drv_index]);
+        h->gendisk[drv_index] = NULL;
+        return -1;
 }
 
 /* This is for the special case of a controller which
@@ -1713,6 +1952,7 @@ static int rebuild_lun_table(ctlr_info_t *h, int first_time)
                         h->drv[i].busy_configuring = 1;
                         spin_unlock_irqrestore(CCISS_LOCK(h->ctlr), flags);
                         return_code = deregister_disk(h, i, 1);
+                        cciss_destroy_ld_sysfs_entry(&h->drv[i]);
                         h->drv[i].busy_configuring = 0;
                 }
         }
@@ -3719,12 +3959,15 @@ static int __devinit cciss_init_one(struct pci_dev *pdev,
         INIT_HLIST_HEAD(&hba[i]->reqQ);
 
         if (cciss_pci_init(hba[i], pdev) != 0)
-                goto clean1;
+                goto clean0;
 
         sprintf(hba[i]->devname, "cciss%d", i);
         hba[i]->ctlr = i;
         hba[i]->pdev = pdev;
 
+        if (cciss_create_hba_sysfs_entry(hba[i]))
+                goto clean0;
+
         /* configure PCI DMA stuff */
         if (!pci_set_dma_mask(pdev, DMA_BIT_MASK(64)))
                 dac = 1;
@@ -3868,6 +4111,8 @@ clean4:
 clean2:
         unregister_blkdev(hba[i]->major, hba[i]->devname);
 clean1:
+        cciss_destroy_hba_sysfs_entry(hba[i]);
+clean0:
         hba[i]->busy_initializing = 0;
         /* cleanup any queues that may have been initialized */
         for (j=0; j <= hba[i]->highest_lun; j++){
@@ -3978,6 +4223,7 @@ static void __devexit cciss_remove_one(struct pci_dev *pdev)
          */
         pci_release_regions(pdev);
         pci_set_drvdata(pdev, NULL);
+        cciss_destroy_hba_sysfs_entry(hba[i]);
         free_hba(i);
 }
 
@@ -3995,6 +4241,8 @@ static struct pci_driver cciss_pci_driver = {
  */
 static int __init cciss_init(void)
 {
+        int err;
+
         /*
          * The hardware requires that commands are aligned on a 64-bit
          * boundary. Given that we use pci_alloc_consistent() to allocate an
@@ -4004,8 +4252,20 @@ static int __init cciss_init(void)
 
         printk(KERN_INFO DRIVER_NAME "\n");
 
+        err = bus_register(&cciss_bus_type);
+        if (err)
+                return err;
+
         /* Register for our PCI devices */
-        return pci_register_driver(&cciss_pci_driver);
+        err = pci_register_driver(&cciss_pci_driver);
+        if (err)
+                goto err_bus_register;
+
+        return 0;
+
+err_bus_register:
+        bus_unregister(&cciss_bus_type);
+        return err;
 }
 
 static void __exit cciss_cleanup(void)
@@ -4022,6 +4282,7 @@ static void __exit cciss_cleanup(void)
                 }
         }
         remove_proc_entry("driver/cciss", NULL);
+        bus_unregister(&cciss_bus_type);
 }
 
 static void fail_all_cmds(unsigned long ctlr)
diff --git a/drivers/block/cciss.h b/drivers/block/cciss.h
index 703e08038fb9..dd1926d8cd97 100644
--- a/drivers/block/cciss.h
+++ b/drivers/block/cciss.h
@@ -12,6 +12,10 @@
 #define IO_OK           0
 #define IO_ERROR        1
 
+#define VENDOR_LEN      8
+#define MODEL_LEN       16
+#define REV_LEN         4
+
 struct ctlr_info;
 typedef struct ctlr_info ctlr_info_t;
 
@@ -34,13 +38,18 @@ typedef struct _drive_info_struct
         int     cylinders;
         int     raid_level; /* set to -1 to indicate that
                              * the drive is not in use/configured
-                            */
-        int     busy_configuring; /*This is set when the drive is being removed
-                                   *to prevent it from being opened or it's queue
-                                   *from being started.
-                                  */
-        __u8 serial_no[16]; /* from inquiry page 0x83, */
-                            /* not necc. null terminated. */
+                             */
+        int     busy_configuring; /* This is set when a drive is being removed
+                                   * to prevent it from being opened or it's
+                                   * queue from being started.
+                                   */
+        struct  device dev;
+        __u8 serial_no[16]; /* from inquiry page 0x83,
+                             * not necc. null terminated.
+                             */
+        char vendor[VENDOR_LEN + 1]; /* SCSI vendor string */
+        char model[MODEL_LEN + 1];   /* SCSI model string */
+        char rev[REV_LEN + 1];       /* SCSI revision string */
 } drive_info_struct;
 
 #ifdef CONFIG_CISS_SCSI_TAPE
@@ -123,6 +132,7 @@ struct ctlr_info
         unsigned char alive;
         struct completion *rescan_wait;
         struct task_struct *cciss_scan_thread;
+        struct device dev;
 };
 
 /*  Defining the diffent access_menthods */