On Mon, Feb 07, 2005 at 12:27:53PM -0600, Matt Domsch wrote: > Modified files: > drivers/scsi/megaraid/megaraid_mbox.c > (will follow in a separate patch) > is the user of this new function.
For example. I will rework this to follow the patch submitted last week by LSI to accomplish something similar in their driver. -- Matt Domsch Software Architect Dell Linux Solutions linux.dell.com & www.dell.com/linux Linux on Dell mailing lists @ http://lists.us.dell.com ===== drivers/scsi/megaraid/megaraid_mbox.c 1.12 vs edited ===== --- 1.12/drivers/scsi/megaraid/megaraid_mbox.c 2005-01-31 00:33:46 -06:00 +++ edited/drivers/scsi/megaraid/megaraid_mbox.c 2005-02-06 23:35:08 -06:00 @@ -70,6 +70,7 @@ * For history of changes, see Documentation/ChangeLog.megaraid */ +#include <scsi/scsi_hotplug.h> #include "megaraid_mbox.h" static int megaraid_init(void); @@ -455,6 +456,100 @@ /* + * sysfs class device support + * creates three files: + * /sys/class/scsi_host + * |-- host0 + * | |-- logical_drive_created + * | |-- logical_drive_destroyed + * + * These make the midlayer invoke /sbin/hotplug, which then calls back into sysfs + * /sys/class/scsi_host + * |-- host0 + * | |-- scan + * + * and + * + * /sys/devices/pci0000:0x/0000:0x:0x.0/host0 + * |-- 0:0:0:0 + * | |-- delete + * + * respectively. This allows userspace applications to work + * using their logical drive number, and lets the driver translate + * that into host, channel, id, and lun values which the other + * mechanisms require. This is similar to how hot plug CPU works. + */ + +/** + * lda_to_hcil() + * @adapter + * @lda - logical drive address + * @host_no + * @channel + * @id + * @lun + * + * converts a logical drive address into a host, channel id, lun tuple. + */ + +static inline int megaraid_lda_to_hcil(struct Scsi_Host *shost, u32 lda, + u32 *host_no, u32 *channel, u32 *id, u32 *lun) +{ + if (lda > MAX_LOGICAL_DRIVES_40LD) + return -EINVAL; + *host_no = shost->host_no; + *channel = shost->max_channel; + *id = (lda < shost->this_id) ? lda : lda + 1; + *lun = 0; + return 0; +} + +static int megaraid_host_store(struct class_device *class_dev, const char *buf, size_t count, + enum scsi_topology_action action) +{ + struct Scsi_Host *shost = class_to_shost(class_dev); + int fields=0, rc=-EINVAL; + u32 lda=0, host_no=0, channel=0, id=0, lun=0; + fields = sscanf(buf, "%u", &lda); + if (fields != 1) + return rc; + if (lda > MAX_LOGICAL_DRIVES_40LD) + return rc; + rc = megaraid_lda_to_hcil(shost, lda, &host_no, &channel, &id, &lun); + if (rc) + return rc; + + rc = scsi_topology_hctl_action(shost, channel, id, lun, action); + + if (rc) + return rc; + return count; +} + +static ssize_t megaraid_host_store_ld_created(struct class_device *class_dev, const char *buf, size_t count) +{ + return megaraid_host_store(class_dev, buf, count, SCSI_TOPOLOGY_ADDED); +} +static ssize_t megaraid_host_store_ld_destroyed(struct class_device *class_dev, const char *buf, size_t count) +{ + return megaraid_host_store(class_dev, buf, count, SCSI_TOPOLOGY_REMOVED); +} + + +#define MEGARAID_HOST_WOATTR(_name,_store) \ +CLASS_DEVICE_ATTR(_name, S_IWUSR|S_IWGRP, NULL, _store) + +static MEGARAID_HOST_WOATTR(logical_drive_created, megaraid_host_store_ld_created); +static MEGARAID_HOST_WOATTR(logical_drive_destroyed, megaraid_host_store_ld_destroyed); + +/* Host attributes initializer */ +static struct class_device_attribute *megaraid_host_attrs[] = { + &class_device_attr_logical_drive_created, + &class_device_attr_logical_drive_destroyed, + NULL, +}; + +/* * Scsi host template for megaraid unified driver */ static struct scsi_host_template megaraid_template_g = { @@ -467,6 +562,7 @@ .eh_bus_reset_handler = megaraid_reset_handler, .eh_host_reset_handler = megaraid_reset_handler, .use_clustering = ENABLE_CLUSTERING, + .shost_attrs = megaraid_host_attrs, }; - To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
