Gitiles
Code Review Sign In
review.evervolv.com / android_kernel_htc_msm8960 / ada70d9425bcc5e376fef8591e4e76e204c0834c / . / drivers / scsi / megaraid / megaraid_mbox.c
blob: cbe4302462760b681ddd85d79cfd9d02f0258e7d [file] [log] [blame]
/*
*
* Linux MegaRAID device driver
*
* Copyright (c) 2003-2004 LSI Logic Corporation.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* FILE : megaraid_mbox.c
* Version : v2.20.4.6 (Mar 07 2005)
*
* Authors:
* Atul Mukker <Atul.Mukker@lsil.com>
* Sreenivas Bagalkote <Sreenivas.Bagalkote@lsil.com>
* Manoj Jose <Manoj.Jose@lsil.com>
*
* List of supported controllers
*
* OEM Product Name VID DID SSVID SSID
* --- ------------ --- --- ---- ----
* Dell PERC3/QC 101E 1960 1028 0471
* Dell PERC3/DC 101E 1960 1028 0493
* Dell PERC3/SC 101E 1960 1028 0475
* Dell PERC3/Di 1028 1960 1028 0123
* Dell PERC4/SC 1000 1960 1028 0520
* Dell PERC4/DC 1000 1960 1028 0518
* Dell PERC4/QC 1000 0407 1028 0531
* Dell PERC4/Di 1028 000F 1028 014A
* Dell PERC 4e/Si 1028 0013 1028 016c
* Dell PERC 4e/Di 1028 0013 1028 016d
* Dell PERC 4e/Di 1028 0013 1028 016e
* Dell PERC 4e/Di 1028 0013 1028 016f
* Dell PERC 4e/Di 1028 0013 1028 0170
* Dell PERC 4e/DC 1000 0408 1028 0002
* Dell PERC 4e/SC 1000 0408 1028 0001
*
*
* LSI MegaRAID SCSI 320-0 1000 1960 1000 A520
* LSI MegaRAID SCSI 320-1 1000 1960 1000 0520
* LSI MegaRAID SCSI 320-2 1000 1960 1000 0518
* LSI MegaRAID SCSI 320-0X 1000 0407 1000 0530
* LSI MegaRAID SCSI 320-2X 1000 0407 1000 0532
* LSI MegaRAID SCSI 320-4X 1000 0407 1000 0531
* LSI MegaRAID SCSI 320-1E 1000 0408 1000 0001
* LSI MegaRAID SCSI 320-2E 1000 0408 1000 0002
* LSI MegaRAID SATA 150-4 1000 1960 1000 4523
* LSI MegaRAID SATA 150-6 1000 1960 1000 0523
* LSI MegaRAID SATA 300-4X 1000 0409 1000 3004
* LSI MegaRAID SATA 300-8X 1000 0409 1000 3008
*
* INTEL RAID Controller SRCU42X 1000 0407 8086 0532
* INTEL RAID Controller SRCS16 1000 1960 8086 0523
* INTEL RAID Controller SRCU42E 1000 0408 8086 0002
* INTEL RAID Controller SRCZCRX 1000 0407 8086 0530
* INTEL RAID Controller SRCS28X 1000 0409 8086 3008
* INTEL RAID Controller SROMBU42E 1000 0408 8086 3431
* INTEL RAID Controller SROMBU42E 1000 0408 8086 3499
* INTEL RAID Controller SRCU51L 1000 1960 8086 0520
*
* FSC MegaRAID PCI Express ROMB 1000 0408 1734 1065
*
* ACER MegaRAID ROMB-2E 1000 0408 1025 004D
*
* NEC MegaRAID PCI Express ROMB 1000 0408 1033 8287
*
* For history of changes, see Documentation/ChangeLog.megaraid
*/
#include "megaraid_mbox.h"
static int megaraid_init(void);
static void megaraid_exit(void);
static int megaraid_probe_one(struct pci_dev*, const struct pci_device_id *);
static void megaraid_detach_one(struct pci_dev *);
static void megaraid_mbox_shutdown(struct device *);
static int megaraid_io_attach(adapter_t *);
static void megaraid_io_detach(adapter_t *);
static int megaraid_init_mbox(adapter_t *);
static void megaraid_fini_mbox(adapter_t *);
static int megaraid_alloc_cmd_packets(adapter_t *);
static void megaraid_free_cmd_packets(adapter_t *);
static int megaraid_mbox_setup_dma_pools(adapter_t *);
static void megaraid_mbox_teardown_dma_pools(adapter_t *);
static int megaraid_sysfs_alloc_resources(adapter_t *);
static void megaraid_sysfs_free_resources(adapter_t *);
static int megaraid_abort_handler(struct scsi_cmnd *);
static int megaraid_reset_handler(struct scsi_cmnd *);
static int mbox_post_sync_cmd(adapter_t *, uint8_t []);
static int mbox_post_sync_cmd_fast(adapter_t *, uint8_t []);
static int megaraid_busywait_mbox(mraid_device_t *);
static int megaraid_mbox_product_info(adapter_t *);
static int megaraid_mbox_extended_cdb(adapter_t *);
static int megaraid_mbox_support_ha(adapter_t *, uint16_t *);
static int megaraid_mbox_support_random_del(adapter_t *);
static int megaraid_mbox_get_max_sg(adapter_t *);
static void megaraid_mbox_enum_raid_scsi(adapter_t *);
static void megaraid_mbox_flush_cache(adapter_t *);
static void megaraid_mbox_display_scb(adapter_t *, scb_t *);
static void megaraid_mbox_setup_device_map(adapter_t *);
static int megaraid_queue_command(struct scsi_cmnd *,
void (*)(struct scsi_cmnd *));
static scb_t *megaraid_mbox_build_cmd(adapter_t *, struct scsi_cmnd *, int *);
static void megaraid_mbox_runpendq(adapter_t *, scb_t *);
static void megaraid_mbox_prepare_pthru(adapter_t *, scb_t *,
struct scsi_cmnd *);
static void megaraid_mbox_prepare_epthru(adapter_t *, scb_t *,
struct scsi_cmnd *);
static irqreturn_t megaraid_isr(int, void *, struct pt_regs *);
static void megaraid_mbox_dpc(unsigned long);
static ssize_t megaraid_sysfs_show_app_hndl(struct class_device *, char *);
static ssize_t megaraid_sysfs_show_ldnum(struct device *, struct device_attribute *attr, char *);
static int megaraid_cmm_register(adapter_t *);
static int megaraid_cmm_unregister(adapter_t *);
static int megaraid_mbox_mm_handler(unsigned long, uioc_t *, uint32_t);
static int megaraid_mbox_mm_command(adapter_t *, uioc_t *);
static void megaraid_mbox_mm_done(adapter_t *, scb_t *);
static int gather_hbainfo(adapter_t *, mraid_hba_info_t *);
static int wait_till_fw_empty(adapter_t *);
MODULE_AUTHOR("LSI Logic Corporation");
MODULE_DESCRIPTION("LSI Logic MegaRAID Mailbox Driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(MEGARAID_VERSION);
/*
* ### modules parameters for driver ###
*/
/**
* Set to enable driver to expose unconfigured disk to kernel
*/
static int megaraid_expose_unconf_disks = 0;
module_param_named(unconf_disks, megaraid_expose_unconf_disks, int, 0);
MODULE_PARM_DESC(unconf_disks,
"Set to expose unconfigured disks to kernel (default=0)");
/**
* driver wait time if the adapter's mailbox is busy
*/
static unsigned int max_mbox_busy_wait = MBOX_BUSY_WAIT;
module_param_named(busy_wait, max_mbox_busy_wait, int, 0);
MODULE_PARM_DESC(busy_wait,
"Max wait for mailbox in microseconds if busy (default=10)");
/**
* number of sectors per IO command
*/
static unsigned int megaraid_max_sectors = MBOX_MAX_SECTORS;
module_param_named(max_sectors, megaraid_max_sectors, int, 0);
MODULE_PARM_DESC(max_sectors,
"Maximum number of sectors per IO command (default=128)");
/**
* number of commands per logical unit
*/
static unsigned int megaraid_cmd_per_lun = MBOX_DEF_CMD_PER_LUN;
module_param_named(cmd_per_lun, megaraid_cmd_per_lun, int, 0);
MODULE_PARM_DESC(cmd_per_lun,
"Maximum number of commands per logical unit (default=64)");
/**
* Fast driver load option, skip scanning for physical devices during load.
* This would result in non-disk devices being skipped during driver load
* time. These can be later added though, using /proc/scsi/scsi
*/
static unsigned int megaraid_fast_load = 0;
module_param_named(fast_load, megaraid_fast_load, int, 0);
MODULE_PARM_DESC(fast_load,
"Faster loading of the driver, skips physical devices! (default=0)");
/**
* mraid_debug level - threshold for amount of information to be displayed by
* the driver. This level can be changed through modules parameters, ioctl or
* sysfs/proc interface. By default, print the announcement messages only.
*/
int mraid_debug_level = CL_ANN;
module_param_named(debug_level, mraid_debug_level, int, 0);
MODULE_PARM_DESC(debug_level, "Debug level for driver (default=0)");
/*
* ### global data ###
*/
static uint8_t megaraid_mbox_version[8] =
{ 0x02, 0x20, 0x04, 0x06, 3, 7, 20, 5 };
/*
* PCI table for all supported controllers.
*/
static struct pci_device_id pci_id_table_g[] = {
{
PCI_VENDOR_ID_DELL,
PCI_DEVICE_ID_PERC4_DI_DISCOVERY,
PCI_VENDOR_ID_DELL,
PCI_SUBSYS_ID_PERC4_DI_DISCOVERY,
},
{
PCI_VENDOR_ID_LSI_LOGIC,
PCI_DEVICE_ID_PERC4_SC,
PCI_VENDOR_ID_DELL,
PCI_SUBSYS_ID_PERC4_SC,
},
{
PCI_VENDOR_ID_LSI_LOGIC,
PCI_DEVICE_ID_PERC4_DC,
PCI_VENDOR_ID_DELL,
PCI_SUBSYS_ID_PERC4_DC,
},
{
PCI_VENDOR_ID_LSI_LOGIC,
PCI_DEVICE_ID_VERDE,
PCI_ANY_ID,
PCI_ANY_ID,
},
{
PCI_VENDOR_ID_DELL,
PCI_DEVICE_ID_PERC4_DI_EVERGLADES,
PCI_VENDOR_ID_DELL,
PCI_SUBSYS_ID_PERC4_DI_EVERGLADES,
},
{
PCI_VENDOR_ID_DELL,
PCI_DEVICE_ID_PERC4E_SI_BIGBEND,
PCI_VENDOR_ID_DELL,
PCI_SUBSYS_ID_PERC4E_SI_BIGBEND,
},
{
PCI_VENDOR_ID_DELL,
PCI_DEVICE_ID_PERC4E_DI_KOBUK,
PCI_VENDOR_ID_DELL,
PCI_SUBSYS_ID_PERC4E_DI_KOBUK,
},
{
PCI_VENDOR_ID_DELL,
PCI_DEVICE_ID_PERC4E_DI_CORVETTE,
PCI_VENDOR_ID_DELL,
PCI_SUBSYS_ID_PERC4E_DI_CORVETTE,
},
{
PCI_VENDOR_ID_DELL,
PCI_DEVICE_ID_PERC4E_DI_EXPEDITION,
PCI_VENDOR_ID_DELL,
PCI_SUBSYS_ID_PERC4E_DI_EXPEDITION,
},
{
PCI_VENDOR_ID_DELL,
PCI_DEVICE_ID_PERC4E_DI_GUADALUPE,
PCI_VENDOR_ID_DELL,
PCI_SUBSYS_ID_PERC4E_DI_GUADALUPE,
},
{
PCI_VENDOR_ID_LSI_LOGIC,
PCI_DEVICE_ID_DOBSON,
PCI_ANY_ID,
PCI_ANY_ID,
},
{
PCI_VENDOR_ID_AMI,
PCI_DEVICE_ID_AMI_MEGARAID3,
PCI_VENDOR_ID_DELL,
PCI_SUBSYS_ID_PERC3_QC,
},
{
PCI_VENDOR_ID_AMI,
PCI_DEVICE_ID_AMI_MEGARAID3,
PCI_VENDOR_ID_DELL,
PCI_SUBSYS_ID_PERC3_DC,
},
{
PCI_VENDOR_ID_AMI,
PCI_DEVICE_ID_AMI_MEGARAID3,
PCI_VENDOR_ID_DELL,
PCI_SUBSYS_ID_PERC3_SC,
},
{
PCI_VENDOR_ID_AMI,
PCI_DEVICE_ID_AMI_MEGARAID3,
PCI_VENDOR_ID_AMI,
PCI_SUBSYS_ID_PERC3_SC,
},
{
PCI_VENDOR_ID_AMI,
PCI_DEVICE_ID_AMI_MEGARAID3,
PCI_VENDOR_ID_AMI,
PCI_SUBSYS_ID_PERC3_DC,
},
{
PCI_VENDOR_ID_LSI_LOGIC,
PCI_DEVICE_ID_MEGARAID_SCSI_320_0,
PCI_VENDOR_ID_LSI_LOGIC,
PCI_SUBSYS_ID_MEGARAID_SCSI_320_0,
},
{
PCI_VENDOR_ID_LSI_LOGIC,
PCI_DEVICE_ID_MEGARAID_SCSI_320_1,
PCI_VENDOR_ID_LSI_LOGIC,
PCI_SUBSYS_ID_MEGARAID_SCSI_320_1,
},
{
PCI_VENDOR_ID_LSI_LOGIC,
PCI_DEVICE_ID_MEGARAID_SCSI_320_2,
PCI_VENDOR_ID_LSI_LOGIC,
PCI_SUBSYS_ID_MEGARAID_SCSI_320_2,
},
{
PCI_VENDOR_ID_LSI_LOGIC,
PCI_DEVICE_ID_MEGARAID_I4_133_RAID,
PCI_VENDOR_ID_LSI_LOGIC,
PCI_SUBSYS_ID_MEGARAID_I4_133_RAID,
},
{
PCI_VENDOR_ID_LSI_LOGIC,
PCI_DEVICE_ID_MEGARAID_SATA_150_4,
PCI_VENDOR_ID_LSI_LOGIC,
PCI_SUBSYS_ID_MEGARAID_SATA_150_4,
},
{
PCI_VENDOR_ID_LSI_LOGIC,
PCI_DEVICE_ID_MEGARAID_SATA_150_6,
PCI_VENDOR_ID_LSI_LOGIC,
PCI_SUBSYS_ID_MEGARAID_SATA_150_6,
},
{
PCI_VENDOR_ID_LSI_LOGIC,
PCI_DEVICE_ID_LINDSAY,
PCI_ANY_ID,
PCI_ANY_ID,
},
{
PCI_VENDOR_ID_LSI_LOGIC,
PCI_DEVICE_ID_INTEL_RAID_SRCS16,
PCI_VENDOR_ID_INTEL,
PCI_SUBSYS_ID_INTEL_RAID_SRCS16,
},
{
PCI_VENDOR_ID_LSI_LOGIC,
PCI_DEVICE_ID_INTEL_RAID_SRCU41L_LAKE_SHETEK,
PCI_VENDOR_ID_INTEL,
PCI_SUBSYS_ID_INTEL_RAID_SRCU41L_LAKE_SHETEK,
},
{0} /* Terminating entry */
};
MODULE_DEVICE_TABLE(pci, pci_id_table_g);
static struct pci_driver megaraid_pci_driver_g = {
.name = "megaraid",
.id_table = pci_id_table_g,
.probe = megaraid_probe_one,
.remove = __devexit_p(megaraid_detach_one),
.driver = {
.shutdown = megaraid_mbox_shutdown,
}
};
// definitions for the device attributes for exporting logical drive number
// for a scsi address (Host, Channel, Id, Lun)
CLASS_DEVICE_ATTR(megaraid_mbox_app_hndl, S_IRUSR, megaraid_sysfs_show_app_hndl,
NULL);
// Host template initializer for megaraid mbox sysfs device attributes
static struct class_device_attribute *megaraid_shost_attrs[] = {
&class_device_attr_megaraid_mbox_app_hndl,
NULL,
};
DEVICE_ATTR(megaraid_mbox_ld, S_IRUSR, megaraid_sysfs_show_ldnum, NULL);
// Host template initializer for megaraid mbox sysfs device attributes
static struct device_attribute *megaraid_sdev_attrs[] = {
&dev_attr_megaraid_mbox_ld,
NULL,
};
/*
* Scsi host template for megaraid unified driver
*/
static struct scsi_host_template megaraid_template_g = {
.module = THIS_MODULE,
.name = "LSI Logic MegaRAID driver",
.proc_name = "megaraid",
.queuecommand = megaraid_queue_command,
.eh_abort_handler = megaraid_abort_handler,
.eh_device_reset_handler = megaraid_reset_handler,
.eh_bus_reset_handler = megaraid_reset_handler,
.eh_host_reset_handler = megaraid_reset_handler,
.use_clustering = ENABLE_CLUSTERING,
.sdev_attrs = megaraid_sdev_attrs,
.shost_attrs = megaraid_shost_attrs,
};
/**
* megaraid_init - module load hook
*
* We register ourselves as hotplug enabled module and let PCI subsystem
* discover our adaters
**/
static int __init
megaraid_init(void)
{
int rval;
// Announce the driver version
con_log(CL_ANN, (KERN_INFO "megaraid: %s %s\n", MEGARAID_VERSION,
MEGARAID_EXT_VERSION));
// check validity of module parameters
if (megaraid_cmd_per_lun > MBOX_MAX_SCSI_CMDS) {
con_log(CL_ANN, (KERN_WARNING
"megaraid mailbox: max commands per lun reset to %d\n",
MBOX_MAX_SCSI_CMDS));
megaraid_cmd_per_lun = MBOX_MAX_SCSI_CMDS;
}
// register as a PCI hot-plug driver module
rval = pci_register_driver(&megaraid_pci_driver_g);
if (rval < 0) {
con_log(CL_ANN, (KERN_WARNING
"megaraid: could not register hotplug support.\n"));
}
return rval;
}
/**
* megaraid_exit - driver unload entry point
*
* We simply unwrap the megaraid_init routine here
*/
static void __exit
megaraid_exit(void)
{
con_log(CL_DLEVEL1, (KERN_NOTICE "megaraid: unloading framework\n"));
// unregister as PCI hotplug driver
pci_unregister_driver(&megaraid_pci_driver_g);
return;
}
/**
* megaraid_probe_one - PCI hotplug entry point
* @param pdev : handle to this controller's PCI configuration space
* @param id : pci device id of the class of controllers
*
* This routine should be called whenever a new adapter is detected by the
* PCI hotplug susbsytem.
**/
static int __devinit
megaraid_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
{
adapter_t *adapter;
// detected a new controller
con_log(CL_ANN, (KERN_INFO
"megaraid: probe new device %#4.04x:%#4.04x:%#4.04x:%#4.04x: ",
pdev->vendor, pdev->device, pdev->subsystem_vendor,
pdev->subsystem_device));
con_log(CL_ANN, ("bus %d:slot %d:func %d\n", pdev->bus->number,
PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn)));
if (pci_enable_device(pdev)) {
con_log(CL_ANN, (KERN_WARNING
"megaraid: pci_enable_device failed\n"));
return -ENODEV;
}
// Enable bus-mastering on this controller
pci_set_master(pdev);
// Allocate the per driver initialization structure
adapter = kmalloc(sizeof(adapter_t), GFP_KERNEL);
if (adapter == NULL) {
con_log(CL_ANN, (KERN_WARNING
"megaraid: out of memory, %s %d.\n", __FUNCTION__, __LINE__));
goto out_probe_one;
}
memset(adapter, 0, sizeof(adapter_t));
// set up PCI related soft state and other pre-known parameters
adapter->unique_id = pdev->bus->number << 8 | pdev->devfn;
adapter->irq = pdev->irq;
adapter->pdev = pdev;
atomic_set(&adapter->being_detached, 0);
// Setup the default DMA mask. This would be changed later on
// depending on hardware capabilities
if (pci_set_dma_mask(adapter->pdev, DMA_32BIT_MASK) != 0) {
con_log(CL_ANN, (KERN_WARNING
"megaraid: pci_set_dma_mask failed:%d\n", __LINE__));
goto out_free_adapter;
}
// Initialize the synchronization lock for kernel and LLD
spin_lock_init(&adapter->lock);
adapter->host_lock = &adapter->lock;
// Initialize the command queues: the list of free SCBs and the list
// of pending SCBs.
INIT_LIST_HEAD(&adapter->kscb_pool);
spin_lock_init(SCSI_FREE_LIST_LOCK(adapter));
INIT_LIST_HEAD(&adapter->pend_list);
spin_lock_init(PENDING_LIST_LOCK(adapter));
INIT_LIST_HEAD(&adapter->completed_list);
spin_lock_init(COMPLETED_LIST_LOCK(adapter));
// Start the mailbox based controller
if (megaraid_init_mbox(adapter) != 0) {
con_log(CL_ANN, (KERN_WARNING
"megaraid: maibox adapter did not initialize\n"));
goto out_free_adapter;
}
// Register with LSI Common Management Module
if (megaraid_cmm_register(adapter) != 0) {
con_log(CL_ANN, (KERN_WARNING
"megaraid: could not register with management module\n"));
goto out_fini_mbox;
}
// setup adapter handle in PCI soft state
pci_set_drvdata(pdev, adapter);
// attach with scsi mid-layer
if (megaraid_io_attach(adapter) != 0) {
con_log(CL_ANN, (KERN_WARNING "megaraid: io attach failed\n"));
goto out_cmm_unreg;
}
return 0;
out_cmm_unreg:
pci_set_drvdata(pdev, NULL);
megaraid_cmm_unregister(adapter);
out_fini_mbox:
megaraid_fini_mbox(adapter);
out_free_adapter:
kfree(adapter);
out_probe_one:
pci_disable_device(pdev);
return -ENODEV;
}
/**
* megaraid_detach_one - release the framework resources and call LLD release
* routine
* @param pdev : handle for our PCI cofiguration space
*
* This routine is called during driver unload. We free all the allocated
* resources and call the corresponding LLD so that it can also release all
* its resources.
*
* This routine is also called from the PCI hotplug system
**/
static void
megaraid_detach_one(struct pci_dev *pdev)
{
adapter_t *adapter;
struct Scsi_Host *host;
// Start a rollback on this adapter
adapter = pci_get_drvdata(pdev);
if (!adapter) {
con_log(CL_ANN, (KERN_CRIT
"megaraid: Invalid detach on %#4.04x:%#4.04x:%#4.04x:%#4.04x\n",
pdev->vendor, pdev->device, pdev->subsystem_vendor,
pdev->subsystem_device));
return;
}
else {
con_log(CL_ANN, (KERN_NOTICE
"megaraid: detaching device %#4.04x:%#4.04x:%#4.04x:%#4.04x\n",
pdev->vendor, pdev->device, pdev->subsystem_vendor,
pdev->subsystem_device));
}
host = adapter->host;
// do not allow any more requests from the management module for this
// adapter.
// FIXME: How do we account for the request which might still be
// pending with us?
atomic_set(&adapter->being_detached, 1);
// detach from the IO sub-system
megaraid_io_detach(adapter);
// reset the device state in the PCI structure. We check this
// condition when we enter here. If the device state is NULL,
// that would mean the device has already been removed
pci_set_drvdata(pdev, NULL);
// Unregister from common management module
//
// FIXME: this must return success or failure for conditions if there
// is a command pending with LLD or not.
megaraid_cmm_unregister(adapter);
// finalize the mailbox based controller and release all resources
megaraid_fini_mbox(adapter);
kfree(adapter);
scsi_host_put(host);
pci_disable_device(pdev);
return;
}
/**
* megaraid_mbox_shutdown - PCI shutdown for megaraid HBA
* @param device : generice driver model device
*
* Shutdown notification, perform flush cache
*/
static void
megaraid_mbox_shutdown(struct device *device)
{
adapter_t *adapter = pci_get_drvdata(to_pci_dev(device));
static int counter;
if (!adapter) {
con_log(CL_ANN, (KERN_WARNING
"megaraid: null device in shutdown\n"));
return;
}
// flush caches now
con_log(CL_ANN, (KERN_INFO "megaraid: flushing adapter %d...",
counter++));
megaraid_mbox_flush_cache(adapter);
con_log(CL_ANN, ("done\n"));
}
/**
* megaraid_io_attach - attach a device with the IO subsystem
* @param adapter : controller's soft state
*
* Attach this device with the IO subsystem
**/
static int
megaraid_io_attach(adapter_t *adapter)
{
struct Scsi_Host *host;
// Initialize SCSI Host structure
host = scsi_host_alloc(&megaraid_template_g, 8);
if (!host) {
con_log(CL_ANN, (KERN_WARNING
"megaraid mbox: scsi_register failed\n"));
return -1;
}
SCSIHOST2ADAP(host) = (caddr_t)adapter;
adapter->host = host;
// export the parameters required by the mid-layer
scsi_assign_lock(host, adapter->host_lock);
scsi_set_device(host, &adapter->pdev->dev);
host->irq = adapter->irq;
host->unique_id = adapter->unique_id;
host->can_queue = adapter->max_cmds;
host->this_id = adapter->init_id;
host->sg_tablesize = adapter->sglen;
host->max_sectors = adapter->max_sectors;
host->cmd_per_lun = adapter->cmd_per_lun;
host->max_channel = adapter->max_channel;
host->max_id = adapter->max_target;
host->max_lun = adapter->max_lun;
// notify mid-layer about the new controller
if (scsi_add_host(host, &adapter->pdev->dev)) {
con_log(CL_ANN, (KERN_WARNING
"megaraid mbox: scsi_add_host failed\n"));
scsi_host_put(host);
return -1;
}
scsi_scan_host(host);
return 0;
}
/**
* megaraid_io_detach - detach a device from the IO subsystem
* @param adapter : controller's soft state
*
* Detach this device from the IO subsystem
**/
static void
megaraid_io_detach(adapter_t *adapter)
{
struct Scsi_Host *host;
con_log(CL_DLEVEL1, (KERN_INFO "megaraid: io detach\n"));
host = adapter->host;
scsi_remove_host(host);
return;
}
/*
* START: Mailbox Low Level Driver
*
* This is section specific to the single mailbox based controllers
*/
/**
* megaraid_init_mbox - initialize controller
* @param adapter - our soft state
*
* . Allocate 16-byte aligned mailbox memory for firmware handshake
* . Allocate controller's memory resources
* . Find out all initialization data
* . Allocate memory required for all the commands
* . Use internal library of FW routines, build up complete soft state
*/
static int __init
megaraid_init_mbox(adapter_t *adapter)
{
struct pci_dev *pdev;
mraid_device_t *raid_dev;
int i;
adapter->ito = MBOX_TIMEOUT;
pdev = adapter->pdev;
/*
* Allocate and initialize the init data structure for mailbox
* controllers
*/
raid_dev = kmalloc(sizeof(mraid_device_t), GFP_KERNEL);
if (raid_dev == NULL) return -1;
memset(raid_dev, 0, sizeof(mraid_device_t));
/*
* Attach the adapter soft state to raid device soft state
*/
adapter->raid_device = (caddr_t)raid_dev;
raid_dev->fast_load = megaraid_fast_load;
// our baseport
raid_dev->baseport = pci_resource_start(pdev, 0);
if (pci_request_regions(pdev, "MegaRAID: LSI Logic Corporation") != 0) {
con_log(CL_ANN, (KERN_WARNING
"megaraid: mem region busy\n"));
goto out_free_raid_dev;
}
raid_dev->baseaddr = ioremap_nocache(raid_dev->baseport, 128);
if (!raid_dev->baseaddr) {
con_log(CL_ANN, (KERN_WARNING
"megaraid: could not map hba memory\n") );
goto out_release_regions;
}
//
// Setup the rest of the soft state using the library of FW routines
//
// request IRQ and register the interrupt service routine
if (request_irq(adapter->irq, megaraid_isr, SA_SHIRQ, "megaraid",
adapter)) {
con_log(CL_ANN, (KERN_WARNING
"megaraid: Couldn't register IRQ %d!\n", adapter->irq));
goto out_iounmap;
}
// initialize the mutual exclusion lock for the mailbox
spin_lock_init(&raid_dev->mailbox_lock);
// allocate memory required for commands
if (megaraid_alloc_cmd_packets(adapter) != 0) {
goto out_free_irq;
}
// Product info
if (megaraid_mbox_product_info(adapter) != 0) {
goto out_alloc_cmds;
}
// Do we support extended CDBs
adapter->max_cdb_sz = 10;
if (megaraid_mbox_extended_cdb(adapter) == 0) {
adapter->max_cdb_sz = 16;
}
/*
* Do we support cluster environment, if we do, what is the initiator
* id.
* NOTE: In a non-cluster aware firmware environment, the LLD should
* return 7 as initiator id.
*/
adapter->ha = 0;
adapter->init_id = -1;
if (megaraid_mbox_support_ha(adapter, &adapter->init_id) == 0) {
adapter->ha = 1;
}
/*
* Prepare the device ids array to have the mapping between the kernel
* device address and megaraid device address.
* We export the physical devices on their actual addresses. The
* logical drives are exported on a virtual SCSI channel
*/
megaraid_mbox_setup_device_map(adapter);
// If the firmware supports random deletion, update the device id map
if (megaraid_mbox_support_random_del(adapter)) {
// Change the logical drives numbers in device_ids array one
// slot in device_ids is reserved for target id, that's why
// "<=" below
for (i = 0; i <= MAX_LOGICAL_DRIVES_40LD; i++) {
adapter->device_ids[adapter->max_channel][i] += 0x80;
}
adapter->device_ids[adapter->max_channel][adapter->init_id] =
0xFF;
raid_dev->random_del_supported = 1;
}
/*
* find out the maximum number of scatter-gather elements supported by
* this firmware
*/
adapter->sglen = megaraid_mbox_get_max_sg(adapter);
// enumerate RAID and SCSI channels so that all devices on SCSI
// channels can later be exported, including disk devices
megaraid_mbox_enum_raid_scsi(adapter);
/*
* Other parameters required by upper layer
*
* maximum number of sectors per IO command
*/
adapter->max_sectors = megaraid_max_sectors;
/*
* number of queued commands per LUN.
*/
adapter->cmd_per_lun = megaraid_cmd_per_lun;
/*
* Allocate resources required to issue FW calls, when sysfs is
* accessed
*/
if (megaraid_sysfs_alloc_resources(adapter) != 0) {
goto out_alloc_cmds;
}
// Set the DMA mask to 64-bit. All supported controllers as capable of
// DMA in this range
if (pci_set_dma_mask(adapter->pdev, DMA_64BIT_MASK) != 0) {
con_log(CL_ANN, (KERN_WARNING
"megaraid: could not set DMA mask for 64-bit.\n"));
goto out_free_sysfs_res;
}
// setup tasklet for DPC
tasklet_init(&adapter->dpc_h, megaraid_mbox_dpc,
(unsigned long)adapter);
con_log(CL_DLEVEL1, (KERN_INFO
"megaraid mbox hba successfully initialized\n"));
return 0;
out_free_sysfs_res:
megaraid_sysfs_free_resources(adapter);
out_alloc_cmds:
megaraid_free_cmd_packets(adapter);
out_free_irq:
free_irq(adapter->irq, adapter);
out_iounmap:
iounmap(raid_dev->baseaddr);
out_release_regions:
pci_release_regions(pdev);
out_free_raid_dev:
kfree(raid_dev);
return -1;
}
/**
* megaraid_fini_mbox - undo controller initialization
* @param adapter : our soft state
*/
static void
megaraid_fini_mbox(adapter_t *adapter)
{
mraid_device_t *raid_dev = ADAP2RAIDDEV(adapter);
// flush all caches
megaraid_mbox_flush_cache(adapter);
tasklet_kill(&adapter->dpc_h);
megaraid_sysfs_free_resources(adapter);
megaraid_free_cmd_packets(adapter);
free_irq(adapter->irq, adapter);
iounmap(raid_dev->baseaddr);
pci_release_regions(adapter->pdev);
kfree(raid_dev);
return;
}
/**
* megaraid_alloc_cmd_packets - allocate shared mailbox
* @param adapter : soft state of the raid controller
*
* Allocate and align the shared mailbox. This maibox is used to issue
* all the commands. For IO based controllers, the mailbox is also regsitered
* with the FW. Allocate memory for all commands as well.
* This is our big allocator
*/
static int
megaraid_alloc_cmd_packets(adapter_t *adapter)
{
mraid_device_t *raid_dev = ADAP2RAIDDEV(adapter);
struct pci_dev *pdev;
unsigned long align;
scb_t *scb;
mbox_ccb_t *ccb;
struct mraid_pci_blk *epthru_pci_blk;
struct mraid_pci_blk *sg_pci_blk;
struct mraid_pci_blk *mbox_pci_blk;
int i;
pdev = adapter->pdev;
/*
* Setup the mailbox
* Allocate the common 16-byte aligned memory for the handshake
* mailbox.
*/
raid_dev->una_mbox64 = pci_alloc_consistent(adapter->pdev,
sizeof(mbox64_t), &raid_dev->una_mbox64_dma);
if (!raid_dev->una_mbox64) {
con_log(CL_ANN, (KERN_WARNING
"megaraid: out of memory, %s %d\n", __FUNCTION__,
__LINE__));
return -1;
}
memset(raid_dev->una_mbox64, 0, sizeof(mbox64_t));
/*
* Align the mailbox at 16-byte boundary
*/
raid_dev->mbox = &raid_dev->una_mbox64->mbox32;
raid_dev->mbox = (mbox_t *)((((unsigned long)raid_dev->mbox) + 15) &
(~0UL ^ 0xFUL));
raid_dev->mbox64 = (mbox64_t *)(((unsigned long)raid_dev->mbox) - 8);
align = ((void *)raid_dev->mbox -
((void *)&raid_dev->una_mbox64->mbox32));
raid_dev->mbox_dma = (unsigned long)raid_dev->una_mbox64_dma + 8 +
align;
// Allocate memory for commands issued internally
adapter->ibuf = pci_alloc_consistent(pdev, MBOX_IBUF_SIZE,
&adapter->ibuf_dma_h);
if (!adapter->ibuf) {
con_log(CL_ANN, (KERN_WARNING
"megaraid: out of memory, %s %d\n", __FUNCTION__,
__LINE__));
goto out_free_common_mbox;
}
memset(adapter->ibuf, 0, MBOX_IBUF_SIZE);
// Allocate memory for our SCSI Command Blocks and their associated
// memory
/*
* Allocate memory for the base list of scb. Later allocate memory for
* CCBs and embedded components of each CCB and point the pointers in
* scb to the allocated components
* NOTE: The code to allocate SCB will be duplicated in all the LLD
* since the calling routine does not yet know the number of available
* commands.
*/
adapter->kscb_list = kmalloc(sizeof(scb_t) * MBOX_MAX_SCSI_CMDS,
GFP_KERNEL);
if (adapter->kscb_list == NULL) {
con_log(CL_ANN, (KERN_WARNING
"megaraid: out of memory, %s %d\n", __FUNCTION__,
__LINE__));
goto out_free_ibuf;
}
memset(adapter->kscb_list, 0, sizeof(scb_t) * MBOX_MAX_SCSI_CMDS);
// memory allocation for our command packets
if (megaraid_mbox_setup_dma_pools(adapter) != 0) {
con_log(CL_ANN, (KERN_WARNING
"megaraid: out of memory, %s %d\n", __FUNCTION__,
__LINE__));
goto out_free_scb_list;
}
// Adjust the scb pointers and link in the free pool
epthru_pci_blk = raid_dev->epthru_pool;
sg_pci_blk = raid_dev->sg_pool;
mbox_pci_blk = raid_dev->mbox_pool;
for (i = 0; i < MBOX_MAX_SCSI_CMDS; i++) {
scb = adapter->kscb_list + i;
ccb = raid_dev->ccb_list + i;
ccb->mbox = (mbox_t *)(mbox_pci_blk[i].vaddr + 16);
ccb->raw_mbox = (uint8_t *)ccb->mbox;
ccb->mbox64 = (mbox64_t *)(mbox_pci_blk[i].vaddr + 8);
ccb->mbox_dma_h = (unsigned long)mbox_pci_blk[i].dma_addr + 16;
// make sure the mailbox is aligned properly
if (ccb->mbox_dma_h & 0x0F) {
con_log(CL_ANN, (KERN_CRIT
"megaraid mbox: not aligned on 16-bytes\n"));
goto out_teardown_dma_pools;
}
ccb->epthru = (mraid_epassthru_t *)
epthru_pci_blk[i].vaddr;
ccb->epthru_dma_h = epthru_pci_blk[i].dma_addr;
ccb->pthru = (mraid_passthru_t *)ccb->epthru;
ccb->pthru_dma_h = ccb->epthru_dma_h;
ccb->sgl64 = (mbox_sgl64 *)sg_pci_blk[i].vaddr;
ccb->sgl_dma_h = sg_pci_blk[i].dma_addr;
ccb->sgl32 = (mbox_sgl32 *)ccb->sgl64;
scb->ccb = (caddr_t)ccb;
scb->gp = 0;
scb->sno = i; // command index
scb->scp = NULL;
scb->state = SCB_FREE;
scb->dma_direction = PCI_DMA_NONE;
scb->dma_type = MRAID_DMA_NONE;
scb->dev_channel = -1;
scb->dev_target = -1;
// put scb in the free pool
list_add_tail(&scb->list, &adapter->kscb_pool);
}
return 0;
out_teardown_dma_pools:
megaraid_mbox_teardown_dma_pools(adapter);
out_free_scb_list:
kfree(adapter->kscb_list);
out_free_ibuf:
pci_free_consistent(pdev, MBOX_IBUF_SIZE, (void *)adapter->ibuf,
adapter->ibuf_dma_h);
out_free_common_mbox:
pci_free_consistent(adapter->pdev, sizeof(mbox64_t),
(caddr_t)raid_dev->una_mbox64, raid_dev->una_mbox64_dma);
return -1;
}
/**
* megaraid_free_cmd_packets - free memory
* @param adapter : soft state of the raid controller
*
* Release memory resources allocated for commands
*/
static void
megaraid_free_cmd_packets(adapter_t *adapter)
{
mraid_device_t *raid_dev = ADAP2RAIDDEV(adapter);
megaraid_mbox_teardown_dma_pools(adapter);
kfree(adapter->kscb_list);
pci_free_consistent(adapter->pdev, MBOX_IBUF_SIZE,
(void *)adapter->ibuf, adapter->ibuf_dma_h);
pci_free_consistent(adapter->pdev, sizeof(mbox64_t),
(caddr_t)raid_dev->una_mbox64, raid_dev->una_mbox64_dma);
return;
}
/**
* megaraid_mbox_setup_dma_pools - setup dma pool for command packets
* @param adapter : HBA soft state
*
* setup the dma pools for mailbox, passthru and extended passthru structures,
* and scatter-gather lists
*/
static int
megaraid_mbox_setup_dma_pools(adapter_t *adapter)
{
mraid_device_t *raid_dev = ADAP2RAIDDEV(adapter);
struct mraid_pci_blk *epthru_pci_blk;
struct mraid_pci_blk *sg_pci_blk;
struct mraid_pci_blk *mbox_pci_blk;
int i;
// Allocate memory for 16-bytes aligned mailboxes
raid_dev->mbox_pool_handle = pci_pool_create("megaraid mbox pool",
adapter->pdev,
sizeof(mbox64_t) + 16,
16, 0);
if (raid_dev->mbox_pool_handle == NULL) {
goto fail_setup_dma_pool;
}
mbox_pci_blk = raid_dev->mbox_pool;
for (i = 0; i < MBOX_MAX_SCSI_CMDS; i++) {
mbox_pci_blk[i].vaddr = pci_pool_alloc(
raid_dev->mbox_pool_handle,
GFP_KERNEL,
&mbox_pci_blk[i].dma_addr);
if (!mbox_pci_blk[i].vaddr) {
goto fail_setup_dma_pool;
}
}
/*
* Allocate memory for each embedded passthru strucuture pointer
* Request for a 128 bytes aligned structure for each passthru command
* structure
* Since passthru and extended passthru commands are exclusive, they
* share common memory pool. Passthru structures piggyback on memory
* allocted to extended passthru since passthru is smaller of the two
*/
raid_dev->epthru_pool_handle = pci_pool_create("megaraid mbox pthru",
adapter->pdev, sizeof(mraid_epassthru_t), 128, 0);
if (raid_dev->epthru_pool_handle == NULL) {
goto fail_setup_dma_pool;
}
epthru_pci_blk = raid_dev->epthru_pool;
for (i = 0; i < MBOX_MAX_SCSI_CMDS; i++) {
epthru_pci_blk[i].vaddr = pci_pool_alloc(
raid_dev->epthru_pool_handle,
GFP_KERNEL,
&epthru_pci_blk[i].dma_addr);
if (!epthru_pci_blk[i].vaddr) {
goto fail_setup_dma_pool;
}
}
// Allocate memory for each scatter-gather list. Request for 512 bytes
// alignment for each sg list
raid_dev->sg_pool_handle = pci_pool_create("megaraid mbox sg",
adapter->pdev,
sizeof(mbox_sgl64) * MBOX_MAX_SG_SIZE,
512, 0);
if (raid_dev->sg_pool_handle == NULL) {
goto fail_setup_dma_pool;
}
sg_pci_blk = raid_dev->sg_pool;
for (i = 0; i < MBOX_MAX_SCSI_CMDS; i++) {
sg_pci_blk[i].vaddr = pci_pool_alloc(
raid_dev->sg_pool_handle,
GFP_KERNEL,
&sg_pci_blk[i].dma_addr);
if (!sg_pci_blk[i].vaddr) {
goto fail_setup_dma_pool;
}
}
return 0;
fail_setup_dma_pool:
megaraid_mbox_teardown_dma_pools(adapter);
return -1;
}
/**
* megaraid_mbox_teardown_dma_pools - teardown dma pools for command packets
* @param adapter : HBA soft state
*
* teardown the dma pool for mailbox, passthru and extended passthru
* structures, and scatter-gather lists
*/
static void
megaraid_mbox_teardown_dma_pools(adapter_t *adapter)
{
mraid_device_t *raid_dev = ADAP2RAIDDEV(adapter);
struct mraid_pci_blk *epthru_pci_blk;
struct mraid_pci_blk *sg_pci_blk;
struct mraid_pci_blk *mbox_pci_blk;
int i;
sg_pci_blk = raid_dev->sg_pool;
for (i = 0; i < MBOX_MAX_SCSI_CMDS && sg_pci_blk[i].vaddr; i++) {
pci_pool_free(raid_dev->sg_pool_handle, sg_pci_blk[i].vaddr,
sg_pci_blk[i].dma_addr);
}
if (raid_dev->sg_pool_handle)
pci_pool_destroy(raid_dev->sg_pool_handle);
epthru_pci_blk = raid_dev->epthru_pool;
for (i = 0; i < MBOX_MAX_SCSI_CMDS && epthru_pci_blk[i].vaddr; i++) {
pci_pool_free(raid_dev->epthru_pool_handle,
epthru_pci_blk[i].vaddr, epthru_pci_blk[i].dma_addr);
}
if (raid_dev->epthru_pool_handle)
pci_pool_destroy(raid_dev->epthru_pool_handle);
mbox_pci_blk = raid_dev->mbox_pool;
for (i = 0; i < MBOX_MAX_SCSI_CMDS && mbox_pci_blk[i].vaddr; i++) {
pci_pool_free(raid_dev->mbox_pool_handle,
mbox_pci_blk[i].vaddr, mbox_pci_blk[i].dma_addr);
}
if (raid_dev->mbox_pool_handle)
pci_pool_destroy(raid_dev->mbox_pool_handle);
return;
}
/**
* megaraid_alloc_scb - detach and return a scb from the free list
* @adapter : controller's soft state
*
* return the scb from the head of the free list. NULL if there are none
* available
**/
static inline scb_t *
megaraid_alloc_scb(adapter_t *adapter, struct scsi_cmnd *scp)
{
struct list_head *head = &adapter->kscb_pool;
scb_t *scb = NULL;
unsigned long flags;
// detach scb from free pool
spin_lock_irqsave(SCSI_FREE_LIST_LOCK(adapter), flags);
if (list_empty(head)) {
spin_unlock_irqrestore(SCSI_FREE_LIST_LOCK(adapter), flags);
return NULL;
}
scb = list_entry(head->next, scb_t, list);
list_del_init(&scb->list);
spin_unlock_irqrestore(SCSI_FREE_LIST_LOCK(adapter), flags);
scb->state = SCB_ACTIVE;
scb->scp = scp;
scb->dma_type = MRAID_DMA_NONE;
return scb;
}
/**
* megaraid_dealloc_scb - return the scb to the free pool
* @adapter : controller's soft state
* @scb : scb to be freed
*
* return the scb back to the free list of scbs. The caller must 'flush' the
* SCB before calling us. E.g., performing pci_unamp and/or pci_sync etc.
* NOTE NOTE: Make sure the scb is not on any list before calling this
* routine.
**/
static inline void
megaraid_dealloc_scb(adapter_t *adapter, scb_t *scb)
{
unsigned long flags;
// put scb in the free pool
scb->state = SCB_FREE;
scb->scp = NULL;
spin_lock_irqsave(SCSI_FREE_LIST_LOCK(adapter), flags);
list_add(&scb->list, &adapter->kscb_pool);
spin_unlock_irqrestore(SCSI_FREE_LIST_LOCK(adapter), flags);
return;
}
/**
* megaraid_mbox_mksgl - make the scatter-gather list
* @adapter - controller's soft state
* @scb - scsi control block
*
* prepare the scatter-gather list
*/
static inline int
megaraid_mbox_mksgl(adapter_t *adapter, scb_t *scb)
{
struct scatterlist *sgl;
mbox_ccb_t *ccb;
struct page *page;
unsigned long offset;
struct scsi_cmnd *scp;
int sgcnt;
int i;
scp = scb->scp;
ccb = (mbox_ccb_t *)scb->ccb;
// no mapping required if no data to be transferred
if (!scp->request_buffer || !scp->request_bufflen)
return 0;
if (!scp->use_sg) { /* scatter-gather list not used */
page = virt_to_page(scp->request_buffer);
offset = ((unsigned long)scp->request_buffer & ~PAGE_MASK);
ccb->buf_dma_h = pci_map_page(adapter->pdev, page, offset,
scp->request_bufflen,
scb->dma_direction);
scb->dma_type = MRAID_DMA_WBUF;
/*
* We need to handle special 64-bit commands that need a
* minimum of 1 SG
*/
sgcnt = 1;
ccb->sgl64[0].address = ccb->buf_dma_h;
ccb->sgl64[0].length = scp->request_bufflen;
return sgcnt;
}
sgl = (struct scatterlist *)scp->request_buffer;
// The number of sg elements returned must not exceed our limit
sgcnt = pci_map_sg(adapter->pdev, sgl, scp->use_sg,
scb->dma_direction);
if (sgcnt > adapter->sglen) {
con_log(CL_ANN, (KERN_CRIT
"megaraid critical: too many sg elements:%d\n",
sgcnt));
BUG();
}
scb->dma_type = MRAID_DMA_WSG;
for (i = 0; i < sgcnt; i++, sgl++) {
ccb->sgl64[i].address = sg_dma_address(sgl);
ccb->sgl64[i].length = sg_dma_len(sgl);
}
// Return count of SG nodes
return sgcnt;
}
/**
* mbox_post_cmd - issue a mailbox command
* @adapter - controller's soft state
* @scb - command to be issued
*
* post the command to the controller if mailbox is availble.
*/
static inline int
mbox_post_cmd(adapter_t *adapter, scb_t *scb)
{
mraid_device_t *raid_dev = ADAP2RAIDDEV(adapter);
mbox64_t *mbox64;
mbox_t *mbox;
mbox_ccb_t *ccb;
unsigned long flags;
unsigned int i = 0;
ccb = (mbox_ccb_t *)scb->ccb;
mbox = raid_dev->mbox;
mbox64 = raid_dev->mbox64;
/*
* Check for busy mailbox. If it is, return failure - the caller
* should retry later.
*/
spin_lock_irqsave(MAILBOX_LOCK(raid_dev), flags);
if (unlikely(mbox->busy)) {
do {
udelay(1);
i++;
rmb();
} while(mbox->busy && (i < max_mbox_busy_wait));
if (mbox->busy) {
spin_unlock_irqrestore(MAILBOX_LOCK(raid_dev), flags);
return -1;
}
}
// Copy this command's mailbox data into "adapter's" mailbox
memcpy((caddr_t)mbox64, (caddr_t)ccb->mbox64, 22);
mbox->cmdid = scb->sno;
adapter->outstanding_cmds++;
if (scb->dma_direction == PCI_DMA_TODEVICE) {
if (!scb->scp->use_sg) { // sg list not used
pci_dma_sync_single_for_device(adapter->pdev,
ccb->buf_dma_h,
scb->scp->request_bufflen,
PCI_DMA_TODEVICE);
}
else {
pci_dma_sync_sg_for_device(adapter->pdev,
scb->scp->request_buffer,
scb->scp->use_sg, PCI_DMA_TODEVICE);
}
}
mbox->busy = 1; // Set busy
mbox->poll = 0;
mbox->ack = 0;
wmb();
WRINDOOR(raid_dev, raid_dev->mbox_dma | 0x1);
spin_unlock_irqrestore(MAILBOX_LOCK(raid_dev), flags);
return 0;
}
/**
* megaraid_queue_command - generic queue entry point for all LLDs
* @scp : pointer to the scsi command to be executed
* @done : callback routine to be called after the cmd has be completed
*
* Queue entry point for mailbox based controllers.
*/
static int
megaraid_queue_command(struct scsi_cmnd *scp, void (* done)(struct scsi_cmnd *))
{
adapter_t *adapter;
scb_t *scb;
int if_busy;
adapter = SCP2ADAPTER(scp);
scp->scsi_done = done;
scp->result = 0;
assert_spin_locked(adapter->host_lock);
spin_unlock(adapter->host_lock);
/*
* Allocate and build a SCB request
* if_busy flag will be set if megaraid_mbox_build_cmd() command could
* not allocate scb. We will return non-zero status in that case.
* NOTE: scb can be null even though certain commands completed
* successfully, e.g., MODE_SENSE and TEST_UNIT_READY, it would
* return 0 in that case, and we would do the callback right away.
*/
if_busy = 0;
scb = megaraid_mbox_build_cmd(adapter, scp, &if_busy);
if (scb) {
megaraid_mbox_runpendq(adapter, scb);
}
spin_lock(adapter->host_lock);
if (!scb) { // command already completed
done(scp);
return 0;
}
return if_busy;
}
/**
* megaraid_mbox_build_cmd - transform the mid-layer scsi command to megaraid
* firmware lingua
* @adapter - controller's soft state
* @scp - mid-layer scsi command pointer
* @busy - set if request could not be completed because of lack of
* resources
*
* convert the command issued by mid-layer to format understood by megaraid
* firmware. We also complete certain command without sending them to firmware
*/
static scb_t *
megaraid_mbox_build_cmd(adapter_t *adapter, struct scsi_cmnd *scp, int *busy)
{
mraid_device_t *rdev = ADAP2RAIDDEV(adapter);
int channel;
int target;
int islogical;
mbox_ccb_t *ccb;
mraid_passthru_t *pthru;
mbox64_t *mbox64;
mbox_t *mbox;
scb_t *scb;
char skip[] = "skipping";
char scan[] = "scanning";
char *ss;
/*
* Get the appropriate device map for the device this command is
* intended for
*/
MRAID_GET_DEVICE_MAP(adapter, scp, channel, target, islogical);
/*
* Logical drive commands
*/
if (islogical) {
switch (scp->cmnd[0]) {
case TEST_UNIT_READY:
/*
* Do we support clustering and is the support enabled
* If no, return success always
*/
if (!adapter->ha) {
scp->result = (DID_OK << 16);
return NULL;
}
if (!(scb = megaraid_alloc_scb(adapter, scp))) {
scp->result = (DID_ERROR << 16);
*busy = 1;
return NULL;
}
scb->dma_direction = scp->sc_data_direction;
scb->dev_channel = 0xFF;
scb->dev_target = target;
ccb = (mbox_ccb_t *)scb->ccb;
/*
* The command id will be provided by the command
* issuance routine
*/
ccb->raw_mbox[0] = CLUSTER_CMD;
ccb->raw_mbox[2] = RESERVATION_STATUS;
ccb->raw_mbox[3] = target;
return scb;
case MODE_SENSE:
if (scp->use_sg) {
struct scatterlist *sgl;
caddr_t vaddr;
sgl = (struct scatterlist *)scp->request_buffer;
if (sgl->page) {
vaddr = (caddr_t)
(page_address((&sgl[0])->page)
+ (&sgl[0])->offset);
memset(vaddr, 0, scp->cmnd[4]);
}
else {
con_log(CL_ANN, (KERN_WARNING
"megaraid mailbox: invalid sg:%d\n",
__LINE__));
}
}
else {
memset(scp->request_buffer, 0, scp->cmnd[4]);
}
scp->result = (DID_OK << 16);
return NULL;
case INQUIRY:
/*
* Display the channel scan for logical drives
* Do not display scan for a channel if already done.
*/
if (!(rdev->last_disp & (1L << SCP2CHANNEL(scp)))) {
con_log(CL_ANN, (KERN_INFO
"scsi[%d]: scanning scsi channel %d",
adapter->host->host_no,
SCP2CHANNEL(scp)));
con_log(CL_ANN, (
" [virtual] for logical drives\n"));
rdev->last_disp |= (1L << SCP2CHANNEL(scp));
}
/* Fall through */
case READ_CAPACITY:
/*
* Do not allow LUN > 0 for logical drives and
* requests for more than 40 logical drives
*/
if (SCP2LUN(scp)) {
scp->result = (DID_BAD_TARGET << 16);
return NULL;
}
if ((target % 0x80) >= MAX_LOGICAL_DRIVES_40LD) {
scp->result = (DID_BAD_TARGET << 16);
return NULL;
}
/* Allocate a SCB and initialize passthru */
if (!(scb = megaraid_alloc_scb(adapter, scp))) {
scp->result = (DID_ERROR << 16);
*busy = 1;
return NULL;
}
ccb = (mbox_ccb_t *)scb->ccb;
scb->dev_channel = 0xFF;
scb->dev_target = target;
pthru = ccb->pthru;
mbox = ccb->mbox;
mbox64 = ccb->mbox64;
pthru->timeout = 0;
pthru->ars = 1;
pthru->reqsenselen = 14;
pthru->islogical = 1;
pthru->logdrv = target;
pthru->cdblen = scp->cmd_len;
memcpy(pthru->cdb, scp->cmnd, scp->cmd_len);
mbox->cmd = MBOXCMD_PASSTHRU64;
scb->dma_direction = scp->sc_data_direction;
pthru->dataxferlen = scp->request_bufflen;
pthru->dataxferaddr = ccb->sgl_dma_h;
pthru->numsge = megaraid_mbox_mksgl(adapter,
scb);
mbox->xferaddr = 0xFFFFFFFF;
mbox64->xferaddr_lo = (uint32_t )ccb->pthru_dma_h;
mbox64->xferaddr_hi = 0;
return scb;
case READ_6:
case WRITE_6:
case READ_10:
case WRITE_10:
case READ_12:
case WRITE_12:
/*
* Allocate a SCB and initialize mailbox
*/
if (!(scb = megaraid_alloc_scb(adapter, scp))) {
scp->result = (DID_ERROR << 16);
*busy = 1;
return NULL;
}
ccb = (mbox_ccb_t *)scb->ccb;
scb->dev_channel = 0xFF;
scb->dev_target = target;
mbox = ccb->mbox;
mbox64 = ccb->mbox64;
mbox->logdrv = target;
/*
* A little HACK: 2nd bit is zero for all scsi read
* commands and is set for all scsi write commands
*/
mbox->cmd = (scp->cmnd[0] & 0x02) ? MBOXCMD_LWRITE64:
MBOXCMD_LREAD64 ;
/*
* 6-byte READ(0x08) or WRITE(0x0A) cdb
*/
if (scp->cmd_len == 6) {
mbox->numsectors = (uint32_t)scp->cmnd[4];
mbox->lba =
((uint32_t)scp->cmnd[1] << 16) |
((uint32_t)scp->cmnd[2] << 8) |
(uint32_t)scp->cmnd[3];
mbox->lba &= 0x1FFFFF;
}
/*
* 10-byte READ(0x28) or WRITE(0x2A) cdb
*/
else if (scp->cmd_len == 10) {
mbox->numsectors =
(uint32_t)scp->cmnd[8] |
((uint32_t)scp->cmnd[7] << 8);
mbox->lba =
((uint32_t)scp->cmnd[2] << 24) |
((uint32_t)scp->cmnd[3] << 16) |
((uint32_t)scp->cmnd[4] << 8) |
(uint32_t)scp->cmnd[5];
}
/*
* 12-byte READ(0xA8) or WRITE(0xAA) cdb
*/
else if (scp->cmd_len == 12) {
mbox->lba =
((uint32_t)scp->cmnd[2] << 24) |
((uint32_t)scp->cmnd[3] << 16) |
((uint32_t)scp->cmnd[4] << 8) |
(uint32_t)scp->cmnd[5];
mbox->numsectors =
((uint32_t)scp->cmnd[6] << 24) |
((uint32_t)scp->cmnd[7] << 16) |
((uint32_t)scp->cmnd[8] << 8) |
(uint32_t)scp->cmnd[9];
}
else {
con_log(CL_ANN, (KERN_WARNING
"megaraid: unsupported CDB length\n"));
megaraid_dealloc_scb(adapter, scb);
scp->result = (DID_ERROR << 16);
return NULL;
}
scb->dma_direction = scp->sc_data_direction;
// Calculate Scatter-Gather info
mbox64->xferaddr_lo = (uint32_t )ccb->sgl_dma_h;
mbox->numsge = megaraid_mbox_mksgl(adapter,
scb);
mbox->xferaddr = 0xFFFFFFFF;
mbox64->xferaddr_hi = 0;
return scb;
case RESERVE:
case RELEASE:
/*
* Do we support clustering and is the support enabled
*/
if (!adapter->ha) {
scp->result = (DID_BAD_TARGET << 16);
return NULL;
}
/*
* Allocate a SCB and initialize mailbox
*/
if (!(scb = megaraid_alloc_scb(adapter, scp))) {
scp->result = (DID_ERROR << 16);
*busy = 1;
return NULL;
}
ccb = (mbox_ccb_t *)scb->ccb;
scb->dev_channel = 0xFF;
scb->dev_target = target;
ccb->raw_mbox[0] = CLUSTER_CMD;
ccb->raw_mbox[2] = (scp->cmnd[0] == RESERVE) ?
RESERVE_LD : RELEASE_LD;
ccb->raw_mbox[3] = target;
scb->dma_direction = scp->sc_data_direction;
return scb;
default:
scp->result = (DID_BAD_TARGET << 16);
return NULL;
}
}
else { // Passthru device commands
// Do not allow access to target id > 15 or LUN > 7
if (target > 15 || SCP2LUN(scp) > 7) {
scp->result = (DID_BAD_TARGET << 16);
return NULL;
}
// if fast load option was set and scan for last device is
// over, reset the fast_load flag so that during a possible
// next scan, devices can be made available
if (rdev->fast_load && (target == 15) &&
(SCP2CHANNEL(scp) == adapter->max_channel -1)) {
con_log(CL_ANN, (KERN_INFO
"megaraid[%d]: physical device scan re-enabled\n",
adapter->host->host_no));
rdev->fast_load = 0;
}
/*
* Display the channel scan for physical devices
*/
if (!(rdev->last_disp & (1L << SCP2CHANNEL(scp)))) {
ss = rdev->fast_load ? skip : scan;
con_log(CL_ANN, (KERN_INFO
"scsi[%d]: %s scsi channel %d [Phy %d]",
adapter->host->host_no, ss, SCP2CHANNEL(scp),
channel));
con_log(CL_ANN, (
" for non-raid devices\n"));
rdev->last_disp |= (1L << SCP2CHANNEL(scp));
}
// disable channel sweep if fast load option given
if (rdev->fast_load) {
scp->result = (DID_BAD_TARGET << 16);
return NULL;
}
// Allocate a SCB and initialize passthru
if (!(scb = megaraid_alloc_scb(adapter, scp))) {
scp->result = (DID_ERROR << 16);
*busy = 1;
return NULL;
}
ccb = (mbox_ccb_t *)scb->ccb;
scb->dev_channel = channel;
scb->dev_target = target;
scb->dma_direction = scp->sc_data_direction;
mbox = ccb->mbox;
mbox64 = ccb->mbox64;
// Does this firmware support extended CDBs
if (adapter->max_cdb_sz == 16) {
mbox->cmd = MBOXCMD_EXTPTHRU;
megaraid_mbox_prepare_epthru(adapter, scb, scp);
mbox64->xferaddr_lo = (uint32_t)ccb->epthru_dma_h;
mbox64->xferaddr_hi = 0;
mbox->xferaddr = 0xFFFFFFFF;
}
else {
mbox->cmd = MBOXCMD_PASSTHRU64;
megaraid_mbox_prepare_pthru(adapter, scb, scp);
mbox64->xferaddr_lo = (uint32_t)ccb->pthru_dma_h;
mbox64->xferaddr_hi = 0;
mbox->xferaddr = 0xFFFFFFFF;
}
return scb;
}
// NOT REACHED
}
/**
* megaraid_mbox_runpendq - execute commands queued in the pending queue
* @adapter : controller's soft state
* @scb : SCB to be queued in the pending list
*
* scan the pending list for commands which are not yet issued and try to
* post to the controller. The SCB can be a null pointer, which would indicate
* no SCB to be queue, just try to execute the ones in the pending list.
*
* NOTE: We do not actually traverse the pending list. The SCBs are plucked
* out from the head of the pending list. If it is successfully issued, the
* next SCB is at the head now.
*/
static void
megaraid_mbox_runpendq(adapter_t *adapter, scb_t *scb_q)
{
scb_t *scb;
unsigned long flags;
spin_lock_irqsave(PENDING_LIST_LOCK(adapter), flags);
if (scb_q) {
scb_q->state = SCB_PENDQ;
list_add_tail(&scb_q->list, &adapter->pend_list);
}
// if the adapter in not in quiescent mode, post the commands to FW
if (adapter->quiescent) {
spin_unlock_irqrestore(PENDING_LIST_LOCK(adapter), flags);
return;
}
while (!list_empty(&adapter->pend_list)) {
assert_spin_locked(PENDING_LIST_LOCK(adapter));
scb = list_entry(adapter->pend_list.next, scb_t, list);
// remove the scb from the pending list and try to
// issue. If we are unable to issue it, put back in
// the pending list and return
list_del_init(&scb->list);
spin_unlock_irqrestore(PENDING_LIST_LOCK(adapter), flags);
// if mailbox was busy, return SCB back to pending
// list. Make sure to add at the head, since that's
// where it would have been removed from
scb->state = SCB_ISSUED;
if (mbox_post_cmd(adapter, scb) != 0) {
spin_lock_irqsave(PENDING_LIST_LOCK(adapter), flags);
scb->state = SCB_PENDQ;
list_add(&scb->list, &adapter->pend_list);
spin_unlock_irqrestore(PENDING_LIST_LOCK(adapter),
flags);
return;
}
spin_lock_irqsave(PENDING_LIST_LOCK(adapter), flags);
}
spin_unlock_irqrestore(PENDING_LIST_LOCK(adapter), flags);
return;
}
/**
* megaraid_mbox_prepare_pthru - prepare a command for physical devices
* @adapter - pointer to controller's soft state
* @scb - scsi control block
* @scp - scsi command from the mid-layer
*
* prepare a command for the scsi physical devices
*/
static void
megaraid_mbox_prepare_pthru(adapter_t *adapter, scb_t *scb,
struct scsi_cmnd *scp)
{
mbox_ccb_t *ccb;
mraid_passthru_t *pthru;
uint8_t channel;
uint8_t target;
ccb = (mbox_ccb_t *)scb->ccb;
pthru = ccb->pthru;
channel = scb->dev_channel;
target = scb->dev_target;
// 0=6sec, 1=60sec, 2=10min, 3=3hrs, 4=NO timeout
pthru->timeout = 4;
pthru->ars = 1;
pthru->islogical = 0;
pthru->channel = 0;
pthru->target = (channel << 4) | target;
pthru->logdrv = SCP2LUN(scp);
pthru->reqsenselen = 14;
pthru->cdblen = scp->cmd_len;
memcpy(pthru->cdb, scp->cmnd, scp->cmd_len);
if (scp->request_bufflen) {
pthru->dataxferlen = scp->request_bufflen;
pthru->dataxferaddr = ccb->sgl_dma_h;
pthru->numsge = megaraid_mbox_mksgl(adapter, scb);
}
else {
pthru->dataxferaddr = 0;
pthru->dataxferlen = 0;
pthru->numsge = 0;
}
return;
}
/**
* megaraid_mbox_prepare_epthru - prepare a command for physical devices
* @adapter - pointer to controller's soft state
* @scb - scsi control block
* @scp - scsi command from the mid-layer
*
* prepare a command for the scsi physical devices. This rountine prepares
* commands for devices which can take extended CDBs (>10 bytes)
*/
static void
megaraid_mbox_prepare_epthru(adapter_t *adapter, scb_t *scb,
struct scsi_cmnd *scp)
{
mbox_ccb_t *ccb;
mraid_epassthru_t *epthru;
uint8_t channel;
uint8_t target;
ccb = (mbox_ccb_t *)scb->ccb;
epthru = ccb->epthru;
channel = scb->dev_channel;
target = scb->dev_target;
// 0=6sec, 1=60sec, 2=10min, 3=3hrs, 4=NO timeout
epthru->timeout = 4;
epthru->ars = 1;
epthru->islogical = 0;
epthru->channel = 0;
epthru->target = (channel << 4) | target;
epthru->logdrv = SCP2LUN(scp);
epthru->reqsenselen = 14;
epthru->cdblen = scp->cmd_len;
memcpy(epthru->cdb, scp->cmnd, scp->cmd_len);
if (scp->request_bufflen) {
epthru->dataxferlen = scp->request_bufflen;
epthru->dataxferaddr = ccb->sgl_dma_h;
epthru->numsge = megaraid_mbox_mksgl(adapter, scb);
}
else {
epthru->dataxferaddr = 0;
epthru->dataxferlen = 0;
epthru->numsge = 0;
}
return;
}
/**
* megaraid_ack_sequence - interrupt ack sequence for memory mapped HBAs
* @adapter - controller's soft state
*
* Interrupt ackrowledgement sequence for memory mapped HBAs. Find out the
* completed command and put them on the completed list for later processing.
*
* Returns: 1 if the interrupt is valid, 0 otherwise
*/
static inline int
megaraid_ack_sequence(adapter_t *adapter)
{
mraid_device_t *raid_dev = ADAP2RAIDDEV(adapter);
mbox_t *mbox;
scb_t *scb;
uint8_t nstatus;
uint8_t completed[MBOX_MAX_FIRMWARE_STATUS];
struct list_head clist;
int handled;
uint32_t dword;
unsigned long flags;
int i, j;
mbox = raid_dev->mbox;
// move the SCBs from the firmware completed array to our local list
INIT_LIST_HEAD(&clist);
// loop till F/W has more commands for us to complete
handled = 0;
spin_lock_irqsave(MAILBOX_LOCK(raid_dev), flags);
do {
/*
* Check if a valid interrupt is pending. If found, force the
* interrupt line low.
*/
dword = RDOUTDOOR(raid_dev);
if (dword != 0x10001234) break;
handled = 1;
WROUTDOOR(raid_dev, 0x10001234);
nstatus = 0;
// wait for valid numstatus to post
for (i = 0; i < 0xFFFFF; i++) {
if (mbox->numstatus != 0xFF) {
nstatus = mbox->numstatus;
break;
}
rmb();
}
mbox->numstatus = 0xFF;
adapter->outstanding_cmds -= nstatus;
for (i = 0; i < nstatus; i++) {
// wait for valid command index to post
for (j = 0; j < 0xFFFFF; j++) {
if (mbox->completed[i] != 0xFF) break;
rmb();
}
completed[i] = mbox->completed[i];
mbox->completed[i] = 0xFF;
if (completed[i] == 0xFF) {
con_log(CL_ANN, (KERN_CRIT
"megaraid: command posting timed out\n"));
BUG();
continue;
}
// Get SCB associated with this command id
if (completed[i] >= MBOX_MAX_SCSI_CMDS) {
// a cmm command
scb = adapter->uscb_list + (completed[i] -
MBOX_MAX_SCSI_CMDS);
}
else {
// an os command
scb = adapter->kscb_list + completed[i];
}
scb->status = mbox->status;
list_add_tail(&scb->list, &clist);
}
// Acknowledge interrupt
WRINDOOR(raid_dev, 0x02);
} while(1);
spin_unlock_irqrestore(MAILBOX_LOCK(raid_dev), flags);
// put the completed commands in the completed list. DPC would
// complete these commands later
spin_lock_irqsave(COMPLETED_LIST_LOCK(adapter), flags);
list_splice(&clist, &adapter->completed_list);
spin_unlock_irqrestore(COMPLETED_LIST_LOCK(adapter), flags);
// schedule the DPC if there is some work for it
if (handled)
tasklet_schedule(&adapter->dpc_h);
return handled;
}
/**
* megaraid_isr - isr for memory based mailbox based controllers
* @irq - irq
* @devp - pointer to our soft state
* @regs - unused
*
* Interrupt service routine for memory-mapped mailbox controllers.
*/
static irqreturn_t
megaraid_isr(int irq, void *devp, struct pt_regs *regs)
{
adapter_t *adapter = devp;
int handled;
handled = megaraid_ack_sequence(adapter);
/* Loop through any pending requests */
if (!adapter->quiescent) {
megaraid_mbox_runpendq(adapter, NULL);
}
return IRQ_RETVAL(handled);
}
/**
* megaraid_mbox_sync_scb - sync kernel buffers
* @adapter : controller's soft state
* @scb : pointer to the resource packet
*
* DMA sync if required.
*/
static inline void
megaraid_mbox_sync_scb(adapter_t *adapter, scb_t *scb)
{
mbox_ccb_t *ccb;
ccb = (mbox_ccb_t *)scb->ccb;
switch (scb->dma_type) {
case MRAID_DMA_WBUF:
if (scb->dma_direction == PCI_DMA_FROMDEVICE) {
pci_dma_sync_single_for_cpu(adapter->pdev,
ccb->buf_dma_h,
scb->scp->request_bufflen,
PCI_DMA_FROMDEVICE);
}
pci_unmap_page(adapter->pdev, ccb->buf_dma_h,
scb->scp->request_bufflen, scb->dma_direction);
break;
case MRAID_DMA_WSG:
if (scb->dma_direction == PCI_DMA_FROMDEVICE) {
pci_dma_sync_sg_for_cpu(adapter->pdev,
scb->scp->request_buffer,
scb->scp->use_sg, PCI_DMA_FROMDEVICE);
}
pci_unmap_sg(adapter->pdev, scb->scp->request_buffer,
scb->scp->use_sg, scb->dma_direction);
break;
default:
break;
}
return;
}
/**
* megaraid_mbox_dpc - the tasklet to complete the commands from completed list
* @devp : pointer to HBA soft state
*
* Pick up the commands from the completed list and send back to the owners.
* This is a reentrant function and does not assume any locks are held while
* it is being called.
*/
static void
megaraid_mbox_dpc(unsigned long devp)
{
adapter_t *adapter = (adapter_t *)devp;
mraid_device_t *raid_dev;
struct list_head clist;
struct scatterlist *sgl;
scb_t *scb;
scb_t *tmp;
struct scsi_cmnd *scp;
mraid_passthru_t *pthru;
mraid_epassthru_t *epthru;
mbox_ccb_t *ccb;
int islogical;
int pdev_index;
int pdev_state;
mbox_t *mbox;
unsigned long flags;
uint8_t c;
int status;
if (!adapter) return;
raid_dev = ADAP2RAIDDEV(adapter);
// move the SCBs from the completed list to our local list
INIT_LIST_HEAD(&clist);
spin_lock_irqsave(COMPLETED_LIST_LOCK(adapter), flags);
list_splice_init(&adapter->completed_list, &clist);
spin_unlock_irqrestore(COMPLETED_LIST_LOCK(adapter), flags);
list_for_each_entry_safe(scb, tmp, &clist, list) {
status = scb->status;
scp = scb->scp;
ccb = (mbox_ccb_t *)scb->ccb;
pthru = ccb->pthru;
epthru = ccb->epthru;
mbox = ccb->mbox;
// Make sure f/w has completed a valid command
if (scb->state != SCB_ISSUED) {
con_log(CL_ANN, (KERN_CRIT
"megaraid critical err: invalid command %d:%d:%p\n",
scb->sno, scb->state, scp));
BUG();
continue; // Must never happen!
}
// check for the management command and complete it right away
if (scb->sno >= MBOX_MAX_SCSI_CMDS) {
scb->state = SCB_FREE;
scb->status = status;
// remove from local clist
list_del_init(&scb->list);
megaraid_mbox_mm_done(adapter, scb);
continue;
}
// Was an abort issued for this command earlier
if (scb->state & SCB_ABORT) {
con_log(CL_ANN, (KERN_NOTICE
"megaraid: aborted cmd %lx[%x] completed\n",
scp->serial_number, scb->sno));
}
/*
* If the inquiry came of a disk drive which is not part of
* any RAID array, expose it to the kernel. For this to be
* enabled, user must set the "megaraid_expose_unconf_disks"
* flag to 1 by specifying it on module parameter list.
* This would enable data migration off drives from other
* configurations.
*/
islogical = MRAID_IS_LOGICAL(adapter, scp);
if (scp->cmnd[0] == INQUIRY && status == 0 && islogical == 0
&& IS_RAID_CH(raid_dev, scb->dev_channel)) {
if (scp->use_sg) {
sgl = (struct scatterlist *)
scp->request_buffer;
if (sgl->page) {
c = *(unsigned char *)
(page_address((&sgl[0])->page) +
(&sgl[0])->offset);
}
else {
con_log(CL_ANN, (KERN_WARNING
"megaraid mailbox: invalid sg:%d\n",
__LINE__));
c = 0;
}
}
else {
c = *(uint8_t *)scp->request_buffer;
}
if ((c & 0x1F ) == TYPE_DISK) {
pdev_index = (scb->dev_channel * 16) +
scb->dev_target;
pdev_state =
raid_dev->pdrv_state[pdev_index] & 0x0F;
if (pdev_state == PDRV_ONLINE ||
pdev_state == PDRV_FAILED ||
pdev_state == PDRV_RBLD ||
pdev_state == PDRV_HOTSPARE ||
megaraid_expose_unconf_disks == 0) {
status = 0xF0;
}
}
}
// Convert MegaRAID status to Linux error code
switch (status) {
case 0x00:
scp->result = (DID_OK << 16);
break;
case 0x02:
/* set sense_buffer and result fields */
if (mbox->cmd == MBOXCMD_PASSTHRU ||
mbox->cmd == MBOXCMD_PASSTHRU64) {
memcpy(scp->sense_buffer, pthru->reqsensearea,
14);
scp->result = DRIVER_SENSE << 24 |
DID_OK << 16 | CHECK_CONDITION << 1;
}
else {
if (mbox->cmd == MBOXCMD_EXTPTHRU) {
memcpy(scp->sense_buffer,
epthru->reqsensearea, 14);
scp->result = DRIVER_SENSE << 24 |
DID_OK << 16 |
CHECK_CONDITION << 1;
} else {
scp->sense_buffer[0] = 0x70;
scp->sense_buffer[2] = ABORTED_COMMAND;
scp->result = CHECK_CONDITION << 1;
}
}
break;
case 0x08:
scp->result = DID_BUS_BUSY << 16 | status;
break;
default:
/*
* If TEST_UNIT_READY fails, we know RESERVATION_STATUS
* failed
*/
if (scp->cmnd[0] == TEST_UNIT_READY) {
scp->result = DID_ERROR << 16 |
RESERVATION_CONFLICT << 1;
}
else
/*
* Error code returned is 1 if Reserve or Release
* failed or the input parameter is invalid
*/
if (status == 1 && (scp->cmnd[0] == RESERVE ||
scp->cmnd[0] == RELEASE)) {
scp->result = DID_ERROR << 16 |
RESERVATION_CONFLICT << 1;
}
else {
scp->result = DID_BAD_TARGET << 16 | status;
}
}
// print a debug message for all failed commands
if (status) {
megaraid_mbox_display_scb(adapter, scb);
}
// Free our internal resources and call the mid-layer callback
// routine
megaraid_mbox_sync_scb(adapter, scb);
// remove from local clist
list_del_init(&scb->list);
// put back in free list
megaraid_dealloc_scb(adapter, scb);
// send the scsi packet back to kernel
spin_lock(adapter->host_lock);
scp->scsi_done(scp);
spin_unlock(adapter->host_lock);
}
return;
}
/**
* megaraid_abort_handler - abort the scsi command
* @scp : command to be aborted
*
* Abort a previous SCSI request. Only commands on the pending list can be
* aborted. All the commands issued to the F/W must complete.
**/
static int
__megaraid_abort_handler(struct scsi_cmnd *scp)
{
adapter_t *adapter;
mraid_device_t *raid_dev;
scb_t *scb;
scb_t *tmp;
int found;
unsigned long flags;
int i;
adapter = SCP2ADAPTER(scp);
raid_dev = ADAP2RAIDDEV(adapter);
assert_spin_locked(adapter->host_lock);
con_log(CL_ANN, (KERN_WARNING
"megaraid: aborting-%ld cmd=%x <c=%d t=%d l=%d>\n",
scp->serial_number, scp->cmnd[0], SCP2CHANNEL(scp),
SCP2TARGET(scp), SCP2LUN(scp)));
// If FW has stopped responding, simply return failure
if (raid_dev->hw_error) {
con_log(CL_ANN, (KERN_NOTICE
"megaraid: hw error, not aborting\n"));
return FAILED;
}
// There might a race here, where the command was completed by the
// firmware and now it is on the completed list. Before we could
// complete the command to the kernel in dpc, the abort came.
// Find out if this is the case to avoid the race.
scb = NULL;
spin_lock_irqsave(COMPLETED_LIST_LOCK(adapter), flags);
list_for_each_entry_safe(scb, tmp, &adapter->completed_list, list) {
if (scb->scp == scp) { // Found command
list_del_init(&scb->list); // from completed list
con_log(CL_ANN, (KERN_WARNING
"megaraid: %ld:%d[%d:%d], abort from completed list\n",
scp->serial_number, scb->sno,
scb->dev_channel, scb->dev_target));
scp->result = (DID_ABORT << 16);
scp->scsi_done(scp);
megaraid_dealloc_scb(adapter, scb);
spin_unlock_irqrestore(COMPLETED_LIST_LOCK(adapter),
flags);
return SUCCESS;
}
}
spin_unlock_irqrestore(COMPLETED_LIST_LOCK(adapter), flags);
// Find out if this command is still on the pending list. If it is and
// was never issued, abort and return success. If the command is owned
// by the firmware, we must wait for it to complete by the FW.
spin_lock_irqsave(PENDING_LIST_LOCK(adapter), flags);
list_for_each_entry_safe(scb, tmp, &adapter->pend_list, list) {
if (scb->scp == scp) { // Found command
list_del_init(&scb->list); // from pending list
ASSERT(!(scb->state & SCB_ISSUED));
con_log(CL_ANN, (KERN_WARNING
"megaraid abort: %ld[%d:%d], driver owner\n",
scp->serial_number, scb->dev_channel,
scb->dev_target));
scp->result = (DID_ABORT << 16);
scp->scsi_done(scp);
megaraid_dealloc_scb(adapter, scb);
spin_unlock_irqrestore(PENDING_LIST_LOCK(adapter),
flags);
return SUCCESS;
}
}
spin_unlock_irqrestore(PENDING_LIST_LOCK(adapter), flags);
// Check do we even own this command, in which case this would be
// owned by the firmware. The only way to locate the FW scb is to
// traverse through the list of all SCB, since driver does not
// maintain these SCBs on any list
found = 0;
for (i = 0; i < MBOX_MAX_SCSI_CMDS; i++) {
scb = adapter->kscb_list + i;
if (scb->scp == scp) {
found = 1;
if (!(scb->state & SCB_ISSUED)) {
con_log(CL_ANN, (KERN_WARNING
"megaraid abort: %ld%d[%d:%d], invalid state\n",
scp->serial_number, scb->sno, scb->dev_channel,
scb->dev_target));
BUG();
}
else {
con_log(CL_ANN, (KERN_WARNING
"megaraid abort: %ld:%d[%d:%d], fw owner\n",
scp->serial_number, scb->sno, scb->dev_channel,
scb->dev_target));
}
}
}
if (!found) {
con_log(CL_ANN, (KERN_WARNING
"megaraid abort: scsi cmd:%ld, do now own\n",
scp->serial_number));
// FIXME: Should there be a callback for this command?
return SUCCESS;
}
// We cannot actually abort a command owned by firmware, return
// failure and wait for reset. In host reset handler, we will find out
// if the HBA is still live
return FAILED;
}
static int
megaraid_abort_handler(struct scsi_cmnd *scp)
{
adapter_t *adapter;
int rc;
adapter = SCP2ADAPTER(scp);
spin_lock_irq(adapter->host_lock);
rc = __megaraid_abort_handler(scp);
spin_unlock_irq(adapter->host_lock);
return rc;
}
/**
* megaraid_reset_handler - device reset hadler for mailbox based driver
* @scp : reference command
*
* Reset handler for the mailbox based controller. First try to find out if
* the FW is still live, in which case the outstanding commands counter mut go
* down to 0. If that happens, also issue the reservation reset command to
* relinquish (possible) reservations on the logical drives connected to this
* host
**/
static int
__megaraid_reset_handler(struct scsi_cmnd *scp)
{
adapter_t *adapter;
scb_t *scb;
scb_t *tmp;
mraid_device_t *raid_dev;
unsigned long flags;
uint8_t raw_mbox[sizeof(mbox_t)];
int rval;
int recovery_window;
int recovering;
int i;
adapter = SCP2ADAPTER(scp);
raid_dev = ADAP2RAIDDEV(adapter);
assert_spin_locked(adapter->host_lock);
con_log(CL_ANN, (KERN_WARNING "megaraid: reseting the host...\n"));
// return failure if adapter is not responding
if (raid_dev->hw_error) {
con_log(CL_ANN, (KERN_NOTICE
"megaraid: hw error, cannot reset\n"));
return FAILED;
}
// Under exceptional conditions, FW can take up to 3 minutes to
// complete command processing. Wait for additional 2 minutes for the
// pending commands counter to go down to 0. If it doesn't, let the
// controller be marked offline
// Also, reset all the commands currently owned by the driver
spin_lock_irqsave(PENDING_LIST_LOCK(adapter), flags);
list_for_each_entry_safe(scb, tmp, &adapter->pend_list, list) {
list_del_init(&scb->list); // from pending list
con_log(CL_ANN, (KERN_WARNING
"megaraid: %ld:%d[%d:%d], reset from pending list\n",
scp->serial_number, scb->sno,
scb->dev_channel, scb->dev_target));
scp->result = (DID_RESET << 16);
scp->scsi_done(scp);
megaraid_dealloc_scb(adapter, scb);
}
spin_unlock_irqrestore(PENDING_LIST_LOCK(adapter), flags);
if (adapter->outstanding_cmds) {
con_log(CL_ANN, (KERN_NOTICE
"megaraid: %d outstanding commands. Max wait %d sec\n",
adapter->outstanding_cmds, MBOX_RESET_WAIT));
}
spin_unlock(adapter->host_lock);
recovery_window = MBOX_RESET_WAIT + MBOX_RESET_EXT_WAIT;
recovering = adapter->outstanding_cmds;
for (i = 0; i < recovery_window && adapter->outstanding_cmds; i++) {
megaraid_ack_sequence(adapter);
// print a message once every 5 seconds only
if (!(i % 5)) {
con_log(CL_ANN, (
"megaraid mbox: Wait for %d commands to complete:%d\n",
adapter->outstanding_cmds,
MBOX_RESET_WAIT - i));
}
// bailout if no recovery happended in reset time
if ((i == MBOX_RESET_WAIT) &&
(recovering == adapter->outstanding_cmds)) {
break;
}
msleep(1000);
}
spin_lock(adapter->host_lock);
// If still outstanding commands, bail out
if (adapter->outstanding_cmds) {
con_log(CL_ANN, (KERN_WARNING
"megaraid mbox: critical hardware error!\n"));
raid_dev->hw_error = 1;
return FAILED;
}
else {
con_log(CL_ANN, (KERN_NOTICE
"megaraid mbox: reset sequence completed sucessfully\n"));
}
// If the controller supports clustering, reset reservations
if (!adapter->ha) return SUCCESS;
// clear reservations if any
raw_mbox[0] = CLUSTER_CMD;
raw_mbox[2] = RESET_RESERVATIONS;
rval = SUCCESS;
if (mbox_post_sync_cmd_fast(adapter, raw_mbox) == 0) {
con_log(CL_ANN,
(KERN_INFO "megaraid: reservation reset\n"));
}
else {
rval = FAILED;
con_log(CL_ANN, (KERN_WARNING
"megaraid: reservation reset failed\n"));
}
return rval;
}
static int
megaraid_reset_handler(struct scsi_cmnd *cmd)
{
int rc;
spin_lock_irq(cmd->device->host->host_lock);
rc = __megaraid_reset_handler(cmd);
spin_unlock_irq(cmd->device->host->host_lock);
return rc;
}
/*
* START: internal commands library
*
* This section of the driver has the common routine used by the driver and
* also has all the FW routines
*/
/**
* mbox_post_sync_cmd() - blocking command to the mailbox based controllers
* @adapter - controller's soft state
* @raw_mbox - the mailbox
*
* Issue a scb in synchronous and non-interrupt mode for mailbox based
* controllers
*/
static int
mbox_post_sync_cmd(adapter_t *adapter, uint8_t raw_mbox[])
{
mraid_device_t *raid_dev = ADAP2RAIDDEV(adapter);
mbox64_t *mbox64;
mbox_t *mbox;
uint8_t status;
int i;
mbox64 = raid_dev->mbox64;
mbox = raid_dev->mbox;
/*
* Wait until mailbox is free
*/
if (megaraid_busywait_mbox(raid_dev) != 0)
goto blocked_mailbox;
/*
* Copy mailbox data into host structure
*/
memcpy((caddr_t)mbox, (caddr_t)raw_mbox, 16);
mbox->cmdid = 0xFE;
mbox->busy = 1;
mbox->poll = 0;
mbox->ack = 0;
mbox->numstatus = 0xFF;
mbox->status = 0xFF;
wmb();
WRINDOOR(raid_dev, raid_dev->mbox_dma | 0x1);
// wait for maximum 1 second for status to post. If the status is not
// available within 1 second, assume FW is initializing and wait
// for an extended amount of time
if (mbox->numstatus == 0xFF) { // status not yet available
udelay(25);;
for (i = 0; mbox->numstatus == 0xFF && i < 1000; i++) {
rmb();
msleep(1);
}
if (i == 1000) {
con_log(CL_ANN, (KERN_NOTICE
"megaraid mailbox: wait for FW to boot "));
for (i = 0; (mbox->numstatus == 0xFF) &&
(i < MBOX_RESET_WAIT); i++) {
rmb();
con_log(CL_ANN, ("\b\b\b\b\b[%03d]",
MBOX_RESET_WAIT - i));
msleep(1000);
}
if (i == MBOX_RESET_WAIT) {
con_log(CL_ANN, (
"\nmegaraid mailbox: status not available\n"));
return -1;
}
con_log(CL_ANN, ("\b\b\b\b\b[ok] \n"));
}
}
// wait for maximum 1 second for poll semaphore
if (mbox->poll != 0x77) {
udelay(25);
for (i = 0; (mbox->poll != 0x77) && (i < 1000); i++) {
rmb();
msleep(1);
}
if (i == 1000) {
con_log(CL_ANN, (KERN_WARNING
"megaraid mailbox: could not get poll semaphore\n"));
return -1;
}
}
WRINDOOR(raid_dev, raid_dev->mbox_dma | 0x2);
wmb();
// wait for maximum 1 second for acknowledgement
if (RDINDOOR(raid_dev) & 0x2) {
udelay(25);
for (i = 0; (RDINDOOR(raid_dev) & 0x2) && (i < 1000); i++) {
rmb();
msleep(1);
}
if (i == 1000) {
con_log(CL_ANN, (KERN_WARNING
"megaraid mailbox: could not acknowledge\n"));
return -1;
}
}
mbox->poll = 0;
mbox->ack = 0x77;
status = mbox->status;
// invalidate the completed command id array. After command
// completion, firmware would write the valid id.
mbox->numstatus = 0xFF;
mbox->status = 0xFF;
for (i = 0; i < MBOX_MAX_FIRMWARE_STATUS; i++) {
mbox->completed[i] = 0xFF;
}
return status;
blocked_mailbox:
con_log(CL_ANN, (KERN_WARNING "megaraid: blocked mailbox\n") );
return -1;
}
/**
* mbox_post_sync_cmd_fast - blocking command to the mailbox based controllers
* @adapter - controller's soft state
* @raw_mbox - the mailbox
*
* Issue a scb in synchronous and non-interrupt mode for mailbox based
* controllers. This is a faster version of the synchronous command and
* therefore can be called in interrupt-context as well
*/
static int
mbox_post_sync_cmd_fast(adapter_t *adapter, uint8_t raw_mbox[])
{
mraid_device_t *raid_dev = ADAP2RAIDDEV(adapter);
mbox_t *mbox;
long i;
mbox = raid_dev->mbox;
// return immediately if the mailbox is busy
if (mbox->busy) return -1;
// Copy mailbox data into host structure
memcpy((caddr_t)mbox, (caddr_t)raw_mbox, 14);
mbox->cmdid = 0xFE;
mbox->busy = 1;
mbox->poll = 0;
mbox->ack = 0;
mbox->numstatus = 0xFF;
mbox->status = 0xFF;
wmb();
WRINDOOR(raid_dev, raid_dev->mbox_dma | 0x1);
for (i = 0; i < 0xFFFFF; i++) {
if (mbox->numstatus != 0xFF) break;
}
if (i == 0xFFFFF) {
// We may need to re-calibrate the counter
con_log(CL_ANN, (KERN_CRIT
"megaraid: fast sync command timed out\n"));
}
WRINDOOR(raid_dev, raid_dev->mbox_dma | 0x2);
wmb();
return mbox->status;
}
/**
* megaraid_busywait_mbox() - Wait until the controller's mailbox is available
* @raid_dev - RAID device (HBA) soft state
*
* wait until the controller's mailbox is available to accept more commands.
* wait for at most 1 second
*/
static int
megaraid_busywait_mbox(mraid_device_t *raid_dev)
{
mbox_t *mbox = raid_dev->mbox;
int i = 0;
if (mbox->busy) {
udelay(25);
for (i = 0; mbox->busy && i < 1000; i++)
msleep(1);
}
if (i < 1000) return 0;
else return -1;
}
/**
* megaraid_mbox_product_info - some static information about the controller
* @adapter - our soft state
*
* issue commands to the controller to grab some parameters required by our
* caller.
*/
static int
megaraid_mbox_product_info(adapter_t *adapter)
{
mraid_device_t *raid_dev = ADAP2RAIDDEV(adapter);
mbox_t *mbox;
uint8_t raw_mbox[sizeof(mbox_t)];
mraid_pinfo_t *pinfo;
dma_addr_t pinfo_dma_h;
mraid_inquiry3_t *mraid_inq3;
int i;
memset((caddr_t)raw_mbox, 0, sizeof(raw_mbox));
mbox = (mbox_t *)raw_mbox;
/*
* Issue an ENQUIRY3 command to find out certain adapter parameters,
* e.g., max channels, max commands etc.
*/
pinfo = pci_alloc_consistent(adapter->pdev, sizeof(mraid_pinfo_t),
&pinfo_dma_h);
if (pinfo == NULL) {
con_log(CL_ANN, (KERN_WARNING
"megaraid: out of memory, %s %d\n", __FUNCTION__,
__LINE__));
return -1;
}
memset(pinfo, 0, sizeof(mraid_pinfo_t));
mbox->xferaddr = (uint32_t)adapter->ibuf_dma_h;
memset((void *)adapter->ibuf, 0, MBOX_IBUF_SIZE);
raw_mbox[0] = FC_NEW_CONFIG;
raw_mbox[2] = NC_SUBOP_ENQUIRY3;
raw_mbox[3] = ENQ3_GET_SOLICITED_FULL;
// Issue the command
if (mbox_post_sync_cmd(adapter, raw_mbox) != 0) {
con_log(CL_ANN, (KERN_WARNING "megaraid: Inquiry3 failed\n"));
pci_free_consistent(adapter->pdev, sizeof(mraid_pinfo_t),
pinfo, pinfo_dma_h);
return -1;
}
/*
* Collect information about state of each physical drive
* attached to the controller. We will expose all the disks
* which are not part of RAID
*/
mraid_inq3 = (mraid_inquiry3_t *)adapter->ibuf;
for (i = 0; i < MBOX_MAX_PHYSICAL_DRIVES; i++) {
raid_dev->pdrv_state[i] = mraid_inq3->pdrv_state[i];
}
/*
* Get product info for information like number of channels,
* maximum commands supported.
*/
memset((caddr_t)raw_mbox, 0, sizeof(raw_mbox));
mbox->xferaddr = (uint32_t)pinfo_dma_h;
raw_mbox[0] = FC_NEW_CONFIG;
raw_mbox[2] = NC_SUBOP_PRODUCT_INFO;
if (mbox_post_sync_cmd(adapter, raw_mbox) != 0) {
con_log(CL_ANN, (KERN_WARNING
"megaraid: product info failed\n"));
pci_free_consistent(adapter->pdev, sizeof(mraid_pinfo_t),
pinfo, pinfo_dma_h);
return -1;
}
/*
* Setup some parameters for host, as required by our caller
*/
adapter->max_channel = pinfo->nchannels;
/*
* we will export all the logical drives on a single channel.
* Add 1 since inquires do not come for inititor ID
*/
adapter->max_target = MAX_LOGICAL_DRIVES_40LD + 1;
adapter->max_lun = 8; // up to 8 LUNs for non-disk devices
/*
* These are the maximum outstanding commands for the scsi-layer
*/
adapter->max_cmds = MBOX_MAX_SCSI_CMDS;
memset(adapter->fw_version, 0, VERSION_SIZE);
memset(adapter->bios_version, 0, VERSION_SIZE);
memcpy(adapter->fw_version, pinfo->fw_version, 4);
adapter->fw_version[4] = 0;
memcpy(adapter->bios_version, pinfo->bios_version, 4);
adapter->bios_version[4] = 0;
con_log(CL_ANN, (KERN_NOTICE
"megaraid: fw version:[%s] bios version:[%s]\n",
adapter->fw_version, adapter->bios_version));
pci_free_consistent(adapter->pdev, sizeof(mraid_pinfo_t), pinfo,
pinfo_dma_h);
return 0;
}
/**
* megaraid_mbox_extended_cdb - check for support for extended CDBs
* @adapter - soft state for the controller
*
* this routine check whether the controller in question supports extended
* ( > 10 bytes ) CDBs
*/
static int
megaraid_mbox_extended_cdb(adapter_t *adapter)
{
mbox_t *mbox;
uint8_t raw_mbox[sizeof(mbox_t)];
int rval;
mbox = (mbox_t *)raw_mbox;
memset((caddr_t)raw_mbox, 0, sizeof(raw_mbox));
mbox->xferaddr = (uint32_t)adapter->ibuf_dma_h;
memset((void *)adapter->ibuf, 0, MBOX_IBUF_SIZE);
raw_mbox[0] = MAIN_MISC_OPCODE;
raw_mbox[2] = SUPPORT_EXT_CDB;
/*
* Issue the command
*/
rval = 0;
if (mbox_post_sync_cmd(adapter, raw_mbox) != 0) {
rval = -1;
}
return rval;
}
/**
* megaraid_mbox_support_ha - Do we support clustering
* @adapter - soft state for the controller
* @init_id - ID of the initiator
*
* Determine if the firmware supports clustering and the ID of the initiator.
*/
static int
megaraid_mbox_support_ha(adapter_t *adapter, uint16_t *init_id)
{
mbox_t *mbox;
uint8_t raw_mbox[sizeof(mbox_t)];
int rval;
mbox = (mbox_t *)raw_mbox;
memset((caddr_t)raw_mbox, 0, sizeof(raw_mbox));
mbox->xferaddr = (uint32_t)adapter->ibuf_dma_h;
memset((void *)adapter->ibuf, 0, MBOX_IBUF_SIZE);
raw_mbox[0] = GET_TARGET_ID;
// Issue the command
*init_id = 7;
rval = -1;
if (mbox_post_sync_cmd(adapter, raw_mbox) == 0) {
*init_id = *(uint8_t *)adapter->ibuf;
con_log(CL_ANN, (KERN_INFO
"megaraid: cluster firmware, initiator ID: %d\n",
*init_id));
rval = 0;
}
return rval;
}
/**
* megaraid_mbox_support_random_del - Do we support random deletion
* @adapter - soft state for the controller
*
* Determine if the firmware supports random deletion
* Return: 1 is operation supported, 0 otherwise
*/
static int
megaraid_mbox_support_random_del(adapter_t *adapter)
{
mbox_t *mbox;
uint8_t raw_mbox[sizeof(mbox_t)];
int rval;
mbox = (mbox_t *)raw_mbox;
memset((caddr_t)raw_mbox, 0, sizeof(mbox_t));
raw_mbox[0] = FC_DEL_LOGDRV;
raw_mbox[2] = OP_SUP_DEL_LOGDRV;
// Issue the command
rval = 0;
if (mbox_post_sync_cmd(adapter, raw_mbox) == 0) {
con_log(CL_DLEVEL1, ("megaraid: supports random deletion\n"));
rval = 1;
}
return rval;
}
/**
* megaraid_mbox_get_max_sg - maximum sg elements supported by the firmware
* @adapter - soft state for the controller
*
* Find out the maximum number of scatter-gather elements supported by the
* firmware
*/
static int
megaraid_mbox_get_max_sg(adapter_t *adapter)
{
mbox_t *mbox;
uint8_t raw_mbox[sizeof(mbox_t)];
int nsg;
mbox = (mbox_t *)raw_mbox;
memset((caddr_t)raw_mbox, 0, sizeof(mbox_t));
mbox->xferaddr = (uint32_t)adapter->ibuf_dma_h;
memset((void *)adapter->ibuf, 0, MBOX_IBUF_SIZE);
raw_mbox[0] = MAIN_MISC_OPCODE;
raw_mbox[2] = GET_MAX_SG_SUPPORT;
// Issue the command
if (mbox_post_sync_cmd(adapter, raw_mbox) == 0) {
nsg = *(uint8_t *)adapter->ibuf;
}
else {
nsg = MBOX_DEFAULT_SG_SIZE;
}
if (nsg > MBOX_MAX_SG_SIZE) nsg = MBOX_MAX_SG_SIZE;
return nsg;
}
/**
* megaraid_mbox_enum_raid_scsi - enumerate the RAID and SCSI channels
* @adapter - soft state for the controller
*
* Enumerate the RAID and SCSI channels for ROMB platoforms so that channels
* can be exported as regular SCSI channels
*/
static void
megaraid_mbox_enum_raid_scsi(adapter_t *adapter)
{
mraid_device_t *raid_dev = ADAP2RAIDDEV(adapter);
mbox_t *mbox;
uint8_t raw_mbox[sizeof(mbox_t)];
mbox = (mbox_t *)raw_mbox;
memset((caddr_t)raw_mbox, 0, sizeof(mbox_t));
mbox->xferaddr = (uint32_t)adapter->ibuf_dma_h;
memset((void *)adapter->ibuf, 0, MBOX_IBUF_SIZE);
raw_mbox[0] = CHNL_CLASS;
raw_mbox[2] = GET_CHNL_CLASS;
// Issue the command. If the command fails, all channels are RAID
// channels
raid_dev->channel_class = 0xFF;
if (mbox_post_sync_cmd(adapter, raw_mbox) == 0) {
raid_dev->channel_class = *(uint8_t *)adapter->ibuf;
}
return;
}
/**
* megaraid_mbox_flush_cache - flush adapter and disks cache
* @param adapter : soft state for the controller
*
* Flush adapter cache followed by disks cache
*/
static void
megaraid_mbox_flush_cache(adapter_t *adapter)
{
mbox_t *mbox;
uint8_t raw_mbox[sizeof(mbox_t)];
mbox = (mbox_t *)raw_mbox;
memset((caddr_t)raw_mbox, 0, sizeof(mbox_t));
raw_mbox[0] = FLUSH_ADAPTER;
if (mbox_post_sync_cmd(adapter, raw_mbox) != 0) {
con_log(CL_ANN, ("megaraid: flush adapter failed\n"));
}
raw_mbox[0] = FLUSH_SYSTEM;
if (mbox_post_sync_cmd(adapter, raw_mbox) != 0) {
con_log(CL_ANN, ("megaraid: flush disks cache failed\n"));
}
return;
}
/**
* megaraid_mbox_display_scb - display SCB information, mostly debug purposes
* @param adapter : controllers' soft state
* @param scb : SCB to be displayed
* @param level : debug level for console print
*
* Diplay information about the given SCB iff the current debug level is
* verbose
*/
static void
megaraid_mbox_display_scb(adapter_t *adapter, scb_t *scb)
{
mbox_ccb_t *ccb;
struct scsi_cmnd *scp;
mbox_t *mbox;
int level;
int i;
ccb = (mbox_ccb_t *)scb->ccb;
scp = scb->scp;
mbox = ccb->mbox;
level = CL_DLEVEL3;
con_log(level, (KERN_NOTICE
"megaraid mailbox: status:%#x cmd:%#x id:%#x ", scb->status,
mbox->cmd, scb->sno));
con_log(level, ("sec:%#x lba:%#x addr:%#x ld:%d sg:%d\n",
mbox->numsectors, mbox->lba, mbox->xferaddr, mbox->logdrv,
mbox->numsge));
if (!scp) return;
con_log(level, (KERN_NOTICE "scsi cmnd: "));
for (i = 0; i < scp->cmd_len; i++) {
con_log(level, ("%#2.02x ", scp->cmnd[i]));
}
con_log(level, ("\n"));
return;
}
/**
* megaraid_mbox_setup_device_map - manage device ids
* @adapter : Driver's soft state
*
* Manange the device ids to have an appropraite mapping between the kernel
* scsi addresses and megaraid scsi and logical drive addresses. We export
* scsi devices on their actual addresses, whereas the logical drives are
* exported on a virtual scsi channel.
**/
static void
megaraid_mbox_setup_device_map(adapter_t *adapter)
{
uint8_t c;
uint8_t t;
/*
* First fill the values on the logical drive channel
*/
for (t = 0; t < LSI_MAX_LOGICAL_DRIVES_64LD; t++)
adapter->device_ids[adapter->max_channel][t] =
(t < adapter->init_id) ? t : t - 1;
adapter->device_ids[adapter->max_channel][adapter->init_id] = 0xFF;
/*
* Fill the values on the physical devices channels
*/
for (c = 0; c < adapter->max_channel; c++)
for (t = 0; t < LSI_MAX_LOGICAL_DRIVES_64LD; t++)
adapter->device_ids[c][t] = (c << 8) | t;
}
/*
* END: internal commands library
*/
/*
* START: Interface for the common management module
*
* This is the module, which interfaces with the common mangement module to
* provide support for ioctl and sysfs
*/
/**
* megaraid_cmm_register - register with the mangement module
* @param adapter : HBA soft state
*
* Register with the management module, which allows applications to issue
* ioctl calls to the drivers. This interface is used by the management module
* to setup sysfs support as well.
*/
static int
megaraid_cmm_register(adapter_t *adapter)
{
mraid_device_t *raid_dev = ADAP2RAIDDEV(adapter);
mraid_mmadp_t adp;
scb_t *scb;
mbox_ccb_t *ccb;
int rval;
int i;
// Allocate memory for the base list of scb for management module.
adapter->uscb_list = kmalloc(sizeof(scb_t) * MBOX_MAX_USER_CMDS,
GFP_KERNEL);
if (adapter->uscb_list == NULL) {
con_log(CL_ANN, (KERN_WARNING
"megaraid: out of memory, %s %d\n", __FUNCTION__,
__LINE__));
return -1;
}
memset(adapter->uscb_list, 0, sizeof(scb_t) * MBOX_MAX_USER_CMDS);
// Initialize the synchronization parameters for resources for
// commands for management module
INIT_LIST_HEAD(&adapter->uscb_pool);
spin_lock_init(USER_FREE_LIST_LOCK(adapter));
// link all the packets. Note, CCB for commands, coming from the
// commom management module, mailbox physical address are already
// setup by it. We just need placeholder for that in our local command
// control blocks
for (i = 0; i < MBOX_MAX_USER_CMDS; i++) {
scb = adapter->uscb_list + i;
ccb = raid_dev->uccb_list + i;
scb->ccb = (caddr_t)ccb;
ccb->mbox64 = raid_dev->umbox64 + i;
ccb->mbox = &ccb->mbox64->mbox32;
ccb->raw_mbox = (uint8_t *)ccb->mbox;
scb->gp = 0;
// COMMAND ID 0 - (MBOX_MAX_SCSI_CMDS-1) ARE RESERVED FOR
// COMMANDS COMING FROM IO SUBSYSTEM (MID-LAYER)
scb->sno = i + MBOX_MAX_SCSI_CMDS;
scb->scp = NULL;
scb->state = SCB_FREE;
scb->dma_direction = PCI_DMA_NONE;
scb->dma_type = MRAID_DMA_NONE;
scb->dev_channel = -1;
scb->dev_target = -1;
// put scb in the free pool
list_add_tail(&scb->list, &adapter->uscb_pool);
}
adp.unique_id = adapter->unique_id;
adp.drvr_type = DRVRTYPE_MBOX;
adp.drvr_data = (unsigned long)adapter;
adp.pdev = adapter->pdev;
adp.issue_uioc = megaraid_mbox_mm_handler;
adp.timeout = 300;
adp.max_kioc = MBOX_MAX_USER_CMDS;
if ((rval = mraid_mm_register_adp(&adp)) != 0) {
con_log(CL_ANN, (KERN_WARNING
"megaraid mbox: did not register with CMM\n"));
kfree(adapter->uscb_list);
}
return rval;
}
/**
* megaraid_cmm_unregister - un-register with the mangement module
* @param adapter : HBA soft state
*
* Un-register with the management module.
* FIXME: mgmt module must return failure for unregister if it has pending
* commands in LLD
*/
static int
megaraid_cmm_unregister(adapter_t *adapter)
{
kfree(adapter->uscb_list);
mraid_mm_unregister_adp(adapter->unique_id);
return 0;
}
/**
* megaraid_mbox_mm_handler - interface for CMM to issue commands to LLD
* @param drvr_data : LLD specific data
* @param kioc : CMM interface packet
* @param action : command action
*
* This routine is invoked whenever the Common Mangement Module (CMM) has a
* command for us. The 'action' parameter specifies if this is a new command
* or otherwise.
*/
static int
megaraid_mbox_mm_handler(unsigned long drvr_data, uioc_t *kioc, uint32_t action)
{
adapter_t *adapter;
if (action != IOCTL_ISSUE) {
con_log(CL_ANN, (KERN_WARNING
"megaraid: unsupported management action:%#2x\n",
action));
return (-ENOTSUPP);
}
adapter = (adapter_t *)drvr_data;
// make sure this adapter is not being detached right now.
if (atomic_read(&adapter->being_detached)) {
con_log(CL_ANN, (KERN_WARNING
"megaraid: reject management request, detaching\n"));
return (-ENODEV);
}
switch (kioc->opcode) {
case GET_ADAP_INFO:
kioc->status = gather_hbainfo(adapter, (mraid_hba_info_t *)
(unsigned long)kioc->buf_vaddr);
kioc->done(kioc);
return kioc->status;
case MBOX_CMD:
return megaraid_mbox_mm_command(adapter, kioc);
default:
kioc->status = (-EINVAL);
kioc->done(kioc);
return (-EINVAL);
}
return 0; // not reached
}
/**
* megaraid_mbox_mm_command - issues commands routed through CMM
* @param adapter : HBA soft state
* @param kioc : management command packet
*
* Issues commands, which are routed through the management module.
*/
static int
megaraid_mbox_mm_command(adapter_t *adapter, uioc_t *kioc)
{
struct list_head *head = &adapter->uscb_pool;
mbox64_t *mbox64;
uint8_t *raw_mbox;
scb_t *scb;
mbox_ccb_t *ccb;
unsigned long flags;
// detach one scb from free pool
spin_lock_irqsave(USER_FREE_LIST_LOCK(adapter), flags);
if (list_empty(head)) { // should never happen because of CMM
con_log(CL_ANN, (KERN_WARNING
"megaraid mbox: bug in cmm handler, lost resources\n"));
spin_unlock_irqrestore(USER_FREE_LIST_LOCK(adapter), flags);
return (-EINVAL);
}
scb = list_entry(head->next, scb_t, list);
list_del_init(&scb->list);
spin_unlock_irqrestore(USER_FREE_LIST_LOCK(adapter), flags);
scb->state = SCB_ACTIVE;
scb->dma_type = MRAID_DMA_NONE;
scb->dma_direction = PCI_DMA_NONE;
ccb = (mbox_ccb_t *)scb->ccb;
mbox64 = (mbox64_t *)(unsigned long)kioc->cmdbuf;
raw_mbox = (uint8_t *)&mbox64->mbox32;
memcpy(ccb->mbox64, mbox64, sizeof(mbox64_t));
scb->gp = (unsigned long)kioc;
/*
* If it is a logdrv random delete operation, we have to wait till
* there are no outstanding cmds at the fw and then issue it directly
*/
if (raw_mbox[0] == FC_DEL_LOGDRV && raw_mbox[2] == OP_DEL_LOGDRV) {
if (wait_till_fw_empty(adapter)) {
con_log(CL_ANN, (KERN_NOTICE
"megaraid mbox: LD delete, timed out\n"));
kioc->status = -ETIME;
scb->status = -1;
megaraid_mbox_mm_done(adapter, scb);
return (-ETIME);
}
INIT_LIST_HEAD(&scb->list);
scb->state = SCB_ISSUED;
if (mbox_post_cmd(adapter, scb) != 0) {
con_log(CL_ANN, (KERN_NOTICE
"megaraid mbox: LD delete, mailbox busy\n"));
kioc->status = -EBUSY;
scb->status = -1;
megaraid_mbox_mm_done(adapter, scb);
return (-EBUSY);
}
return 0;
}
// put the command on the pending list and execute
megaraid_mbox_runpendq(adapter, scb);
return 0;
}
static int
wait_till_fw_empty(adapter_t *adapter)
{
unsigned long flags = 0;
int i;
/*
* Set the quiescent flag to stop issuing cmds to FW.
*/
spin_lock_irqsave(adapter->host_lock, flags);
adapter->quiescent++;
spin_unlock_irqrestore(adapter->host_lock, flags);
/*
* Wait till there are no more cmds outstanding at FW. Try for at most
* 60 seconds
*/
for (i = 0; i < 60 && adapter->outstanding_cmds; i++) {
con_log(CL_DLEVEL1, (KERN_INFO
"megaraid: FW has %d pending commands\n",
adapter->outstanding_cmds));
msleep(1000);
}
return adapter->outstanding_cmds;
}
/**
* megaraid_mbox_mm_done - callback for CMM commands
* @adapter : HBA soft state
* @scb : completed command
*
* Callback routine for internal commands originated from the management
* module.
*/
static void
megaraid_mbox_mm_done(adapter_t *adapter, scb_t *scb)
{
uioc_t *kioc;
mbox64_t *mbox64;
uint8_t *raw_mbox;
unsigned long flags;
kioc = (uioc_t *)scb->gp;
kioc->status = 0;
mbox64 = (mbox64_t *)(unsigned long)kioc->cmdbuf;
mbox64->mbox32.status = scb->status;
raw_mbox = (uint8_t *)&mbox64->mbox32;
// put scb in the free pool
scb->state = SCB_FREE;
scb->scp = NULL;
spin_lock_irqsave(USER_FREE_LIST_LOCK(adapter), flags);
list_add(&scb->list, &adapter->uscb_pool);
spin_unlock_irqrestore(USER_FREE_LIST_LOCK(adapter), flags);
// if a delete logical drive operation succeeded, restart the
// controller
if (raw_mbox[0] == FC_DEL_LOGDRV && raw_mbox[2] == OP_DEL_LOGDRV) {
adapter->quiescent--;
megaraid_mbox_runpendq(adapter, NULL);
}
kioc->done(kioc);
return;
}
/**
* gather_hbainfo - HBA characteristics for the applications
* @param adapter : HBA soft state
* @param hinfo : pointer to the caller's host info strucuture
*/
static int
gather_hbainfo(adapter_t *adapter, mraid_hba_info_t *hinfo)
{
uint8_t dmajor;
dmajor = megaraid_mbox_version[0];
hinfo->pci_vendor_id = adapter->pdev->vendor;
hinfo->pci_device_id = adapter->pdev->device;
hinfo->subsys_vendor_id = adapter->pdev->subsystem_vendor;
hinfo->subsys_device_id = adapter->pdev->subsystem_device;
hinfo->pci_bus = adapter->pdev->bus->number;
hinfo->pci_dev_fn = adapter->pdev->devfn;
hinfo->pci_slot = PCI_SLOT(adapter->pdev->devfn);
hinfo->irq = adapter->host->irq;
hinfo->baseport = ADAP2RAIDDEV(adapter)->baseport;
hinfo->unique_id = (hinfo->pci_bus << 8) | adapter->pdev->devfn;
hinfo->host_no = adapter->host->host_no;
return 0;
}
/*
* END: Interface for the common management module
*/
/**
* megaraid_sysfs_alloc_resources - allocate sysfs related resources
*
* Allocate packets required to issue FW calls whenever the sysfs attributes
* are read. These attributes would require up-to-date information from the
* FW. Also set up resources for mutual exclusion to share these resources and
* the wait queue.
*
* @param adapter : controller's soft state
*
* @return 0 on success
* @return -ERROR_CODE on failure
*/
static int
megaraid_sysfs_alloc_resources(adapter_t *adapter)
{
mraid_device_t *raid_dev = ADAP2RAIDDEV(adapter);
int rval = 0;
raid_dev->sysfs_uioc = kmalloc(sizeof(uioc_t), GFP_KERNEL);
raid_dev->sysfs_mbox64 = kmalloc(sizeof(mbox64_t), GFP_KERNEL);
raid_dev->sysfs_buffer = pci_alloc_consistent(adapter->pdev,
PAGE_SIZE, &raid_dev->sysfs_buffer_dma);
if (!raid_dev->sysfs_uioc || !raid_dev->sysfs_mbox64 ||
!raid_dev->sysfs_buffer) {
con_log(CL_ANN, (KERN_WARNING
"megaraid: out of memory, %s %d\n", __FUNCTION__,
__LINE__));
rval = -ENOMEM;
megaraid_sysfs_free_resources(adapter);
}
sema_init(&raid_dev->sysfs_sem, 1);
init_waitqueue_head(&raid_dev->sysfs_wait_q);
return rval;
}
/**
* megaraid_sysfs_free_resources - free sysfs related resources
*
* Free packets allocated for sysfs FW commands
*
* @param adapter : controller's soft state
*/
static void
megaraid_sysfs_free_resources(adapter_t *adapter)
{
mraid_device_t *raid_dev = ADAP2RAIDDEV(adapter);
if (raid_dev->sysfs_uioc) kfree(raid_dev->sysfs_uioc);
if (raid_dev->sysfs_mbox64) kfree(raid_dev->sysfs_mbox64);
if (raid_dev->sysfs_buffer) {
pci_free_consistent(adapter->pdev, PAGE_SIZE,
raid_dev->sysfs_buffer, raid_dev->sysfs_buffer_dma);
}
}
/**
* megaraid_sysfs_get_ldmap_done - callback for get ldmap
*
* Callback routine called in the ISR/tasklet context for get ldmap call
*
* @param uioc : completed packet
*/
static void
megaraid_sysfs_get_ldmap_done(uioc_t *uioc)
{
adapter_t *adapter = (adapter_t *)uioc->buf_vaddr;
mraid_device_t *raid_dev = ADAP2RAIDDEV(adapter);
uioc->status = 0;
wake_up(&raid_dev->sysfs_wait_q);
}
/**
* megaraid_sysfs_get_ldmap_timeout - timeout handling for get ldmap
*
* Timeout routine to recover and return to application, in case the adapter
* has stopped responding. A timeout of 60 seconds for this command seem like
* a good value
*
* @param uioc : timed out packet
*/
static void
megaraid_sysfs_get_ldmap_timeout(unsigned long data)
{
uioc_t *uioc = (uioc_t *)data;
adapter_t *adapter = (adapter_t *)uioc->buf_vaddr;
mraid_device_t *raid_dev = ADAP2RAIDDEV(adapter);
uioc->status = -ETIME;
wake_up(&raid_dev->sysfs_wait_q);
}
/**
* megaraid_sysfs_get_ldmap - get update logical drive map
*
* This routine will be called whenever user reads the logical drive
* attributes, go get the current logical drive mapping table from the
* firmware. We use the managment API's to issue commands to the controller.
*
* NOTE: The commands issuance functionality is not generalized and
* implemented in context of "get ld map" command only. If required, the
* command issuance logical can be trivially pulled out and implemented as a
* standalone libary. For now, this should suffice since there is no other
* user of this interface.
*
* @param adapter : controller's soft state
*
* @return 0 on success
* @return -1 on failure
*/
static int
megaraid_sysfs_get_ldmap(adapter_t *adapter)
{
mraid_device_t *raid_dev = ADAP2RAIDDEV(adapter);
uioc_t *uioc;
mbox64_t *mbox64;
mbox_t *mbox;
char *raw_mbox;
struct timer_list sysfs_timer;
struct timer_list *timerp;
caddr_t ldmap;
int rval = 0;
/*
* Allow only one read at a time to go through the sysfs attributes
*/
down(&raid_dev->sysfs_sem);
uioc = raid_dev->sysfs_uioc;
mbox64 = raid_dev->sysfs_mbox64;
ldmap = raid_dev->sysfs_buffer;
memset(uioc, 0, sizeof(uioc_t));
memset(mbox64, 0, sizeof(mbox64_t));
memset(ldmap, 0, sizeof(raid_dev->curr_ldmap));
mbox = &mbox64->mbox32;
raw_mbox = (char *)mbox;
uioc->cmdbuf = (uint64_t)(unsigned long)mbox64;
uioc->buf_vaddr = (caddr_t)adapter;
uioc->status = -ENODATA;
uioc->done = megaraid_sysfs_get_ldmap_done;
/*
* Prepare the mailbox packet to get the current logical drive mapping
* table
*/
mbox->xferaddr = (uint32_t)raid_dev->sysfs_buffer_dma;
raw_mbox[0] = FC_DEL_LOGDRV;
raw_mbox[2] = OP_GET_LDID_MAP;
/*
* Setup a timer to recover from a non-responding controller
*/
timerp = &sysfs_timer;
init_timer(timerp);
timerp->function = megaraid_sysfs_get_ldmap_timeout;
timerp->data = (unsigned long)uioc;
timerp->expires = jiffies + 60 * HZ;
add_timer(timerp);
/*
* Send the command to the firmware
*/
rval = megaraid_mbox_mm_command(adapter, uioc);
if (rval == 0) { // command successfully issued
wait_event(raid_dev->sysfs_wait_q, (uioc->status != -ENODATA));
/*
* Check if the command timed out
*/
if (uioc->status == -ETIME) {
con_log(CL_ANN, (KERN_NOTICE
"megaraid: sysfs get ld map timed out\n"));
rval = -ETIME;
}
else {
rval = mbox->status;
}
if (rval == 0) {
memcpy(raid_dev->curr_ldmap, ldmap,
sizeof(raid_dev->curr_ldmap));
}
else {
con_log(CL_ANN, (KERN_NOTICE
"megaraid: get ld map failed with %x\n", rval));
}
}
else {
con_log(CL_ANN, (KERN_NOTICE
"megaraid: could not issue ldmap command:%x\n", rval));
}
del_timer_sync(timerp);
up(&raid_dev->sysfs_sem);
return rval;
}
/**
* megaraid_sysfs_show_app_hndl - display application handle for this adapter
*
* Display the handle used by the applications while executing management
* tasks on the adapter. We invoke a management module API to get the adapter
* handle, since we do not interface with applications directly.
*
* @param cdev : class device object representation for the host
* @param buf : buffer to send data to
*/
static ssize_t
megaraid_sysfs_show_app_hndl(struct class_device *cdev, char *buf)
{
struct Scsi_Host *shost = class_to_shost(cdev);
adapter_t *adapter = (adapter_t *)SCSIHOST2ADAP(shost);
uint32_t app_hndl;
app_hndl = mraid_mm_adapter_app_handle(adapter->unique_id);
return snprintf(buf, 8, "%u\n", app_hndl);
}
/**
* megaraid_sysfs_show_ldnum - display the logical drive number for this device
*
* Display the logical drive number for the device in question, if it a valid
* logical drive. For physical devices, "-1" is returned
* The logical drive number is displayed in following format
*
* <SCSI ID> <LD NUM> <LD STICKY ID> <APP ADAPTER HANDLE>
* <int> <int> <int> <int>
*
* @param dev : device object representation for the scsi device
* @param buf : buffer to send data to
*/
static ssize_t
megaraid_sysfs_show_ldnum(struct device *dev, struct device_attribute *attr, char *buf)
{
struct scsi_device *sdev = to_scsi_device(dev);
adapter_t *adapter = (adapter_t *)SCSIHOST2ADAP(sdev->host);
mraid_device_t *raid_dev = ADAP2RAIDDEV(adapter);
int scsi_id = -1;
int logical_drv = -1;
int ldid_map = -1;
uint32_t app_hndl = 0;
int mapped_sdev_id;
int rval;
int i;
if (raid_dev->random_del_supported &&
MRAID_IS_LOGICAL_SDEV(adapter, sdev)) {
rval = megaraid_sysfs_get_ldmap(adapter);
if (rval == 0) {
for (i = 0; i < MAX_LOGICAL_DRIVES_40LD; i++) {
mapped_sdev_id = sdev->id;
if (sdev->id > adapter->init_id) {
mapped_sdev_id -= 1;
}
if (raid_dev->curr_ldmap[i] == mapped_sdev_id) {
scsi_id = sdev->id;
logical_drv = i;
ldid_map = raid_dev->curr_ldmap[i];
app_hndl = mraid_mm_adapter_app_handle(
adapter->unique_id);
break;
}
}
}
else {
con_log(CL_ANN, (KERN_NOTICE
"megaraid: sysfs get ld map failed: %x\n",
rval));
}
}
return snprintf(buf, 36, "%d %d %d %d\n", scsi_id, logical_drv,
ldid_map, app_hndl);
}
/*
* END: Mailbox Low Level Driver
*/
module_init(megaraid_init);
module_exit(megaraid_exit);
/* vim: set ts=8 sw=8 tw=78 ai si: */