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Diffstat (limited to 'drivers/scsi/megaraid/mega_common.h')
| -rw-r--r-- | drivers/scsi/megaraid/mega_common.h | 286 |
1 files changed, 286 insertions, 0 deletions
diff --git a/drivers/scsi/megaraid/mega_common.h b/drivers/scsi/megaraid/mega_common.h new file mode 100644 index 000000000000..18969a4946b7 --- /dev/null +++ b/drivers/scsi/megaraid/mega_common.h @@ -0,0 +1,286 @@ +/* + * + * 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 : mega_common.h + * + * Libaray of common routine used by all low-level megaraid drivers + */ + +#ifndef _MEGA_COMMON_H_ +#define _MEGA_COMMON_H_ + +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/pci.h> +#include <linux/spinlock.h> +#include <linux/interrupt.h> +#include <linux/delay.h> +#include <linux/blkdev.h> +#include <linux/list.h> +#include <linux/version.h> +#include <linux/moduleparam.h> +#include <asm/semaphore.h> +#include <scsi/scsi.h> +#include <scsi/scsi_cmnd.h> +#include <scsi/scsi_device.h> +#include <scsi/scsi_host.h> + + +#define LSI_MAX_CHANNELS 16 +#define LSI_MAX_LOGICAL_DRIVES_64LD (64+1) + + +/** + * scb_t - scsi command control block + * @param ccb : command control block for individual driver + * @param list : list of control blocks + * @param gp : general purpose field for LLDs + * @param sno : all SCBs have a serial number + * @param scp : associated scsi command + * @param state : current state of scb + * @param dma_dir : direction of data transfer + * @param dma_type : transfer with sg list, buffer, or no data transfer + * @param dev_channel : actual channel on the device + * @param dev_target : actual target on the device + * @param status : completion status + * + * This is our central data structure to issue commands the each driver. + * Driver specific data structures are maintained in the ccb field. + * scb provides a field 'gp', which can be used by LLD for its own purposes + * + * dev_channel and dev_target must be initialized with the actual channel and + * target on the controller. + */ +typedef struct { + caddr_t ccb; + struct list_head list; + unsigned long gp; + unsigned int sno; + struct scsi_cmnd *scp; + uint32_t state; + uint32_t dma_direction; + uint32_t dma_type; + uint16_t dev_channel; + uint16_t dev_target; + uint32_t status; +} scb_t; + +/* + * SCB states as it transitions from one state to another + */ +#define SCB_FREE 0x0000 /* on the free list */ +#define SCB_ACTIVE 0x0001 /* off the free list */ +#define SCB_PENDQ 0x0002 /* on the pending queue */ +#define SCB_ISSUED 0x0004 /* issued - owner f/w */ +#define SCB_ABORT 0x0008 /* Got an abort for this one */ +#define SCB_RESET 0x0010 /* Got a reset for this one */ + +/* + * DMA types for scb + */ +#define MRAID_DMA_NONE 0x0000 /* no data transfer for this command */ +#define MRAID_DMA_WSG 0x0001 /* data transfer using a sg list */ +#define MRAID_DMA_WBUF 0x0002 /* data transfer using a contiguous buffer */ + + +/** + * struct adapter_t - driver's initialization structure + * @param dpc_h : tasklet handle + * @param pdev : pci configuration pointer for kernel + * @param host : pointer to host structure of mid-layer + * @param host_lock : pointer to appropriate lock + * @param lock : synchronization lock for mid-layer and driver + * @param quiescent : driver is quiescent for now. + * @param outstanding_cmds : number of commands pending in the driver + * @param kscb_list : pointer to the bulk of SCBs pointers for IO + * @param kscb_pool : pool of free scbs for IO + * @param kscb_pool_lock : lock for pool of free scbs + * @param pend_list : pending commands list + * @param pend_list_lock : exlusion lock for pending commands list + * @param completed_list : list of completed commands + * @param completed_list_lock : exclusion lock for list of completed commands + * @param sglen : max sg elements supported + * @param device_ids : to convert kernel device addr to our devices. + * @param raid_device : raid adapter specific pointer + * @param max_channel : maximum channel number supported - inclusive + * @param max_target : max target supported - inclusive + * @param max_lun : max lun supported - inclusive + * @param unique_id : unique identifier for each adapter + * @param irq : IRQ for this adapter + * @param ito : internal timeout value, (-1) means no timeout + * @param ibuf : buffer to issue internal commands + * @param ibuf_dma_h : dma handle for the above buffer + * @param uscb_list : SCB pointers for user cmds, common mgmt module + * @param uscb_pool : pool of SCBs for user commands + * @param uscb_pool_lock : exclusion lock for these SCBs + * @param max_cmds : max outstanding commands + * @param fw_version : firmware version + * @param bios_version : bios version + * @param max_cdb_sz : biggest CDB size supported. + * @param ha : is high availability present - clustering + * @param init_id : initiator ID, the default value should be 7 + * @param max_sectors : max sectors per request + * @param cmd_per_lun : max outstanding commands per LUN + * @param being_detached : set when unloading, no more mgmt calls + * + * + * mraid_setup_device_map() can be called anytime after the device map is + * available and MRAID_GET_DEVICE_MAP() can be called whenever the mapping is + * required, usually from LLD's queue entry point. The formar API sets up the + * MRAID_IS_LOGICAL(adapter_t *, struct scsi_cmnd *) to find out if the + * device in question is a logical drive. + * + * quiescent flag should be set by the driver if it is not accepting more + * commands + * + * NOTE: The fields of this structures are placed to minimize cache misses + */ + +// amount of space required to store the bios and firmware version strings +#define VERSION_SIZE 16 + +typedef struct { + struct tasklet_struct dpc_h; + struct pci_dev *pdev; + struct Scsi_Host *host; + spinlock_t *host_lock; + spinlock_t lock; + uint8_t quiescent; + int outstanding_cmds; + scb_t *kscb_list; + struct list_head kscb_pool; + spinlock_t kscb_pool_lock; + struct list_head pend_list; + spinlock_t pend_list_lock; + struct list_head completed_list; + spinlock_t completed_list_lock; + uint16_t sglen; + int device_ids[LSI_MAX_CHANNELS] + [LSI_MAX_LOGICAL_DRIVES_64LD]; + caddr_t raid_device; + uint8_t max_channel; + uint16_t max_target; + uint8_t max_lun; + + uint32_t unique_id; + uint8_t irq; + uint8_t ito; + caddr_t ibuf; + dma_addr_t ibuf_dma_h; + scb_t *uscb_list; + struct list_head uscb_pool; + spinlock_t uscb_pool_lock; + int max_cmds; + uint8_t fw_version[VERSION_SIZE]; + uint8_t bios_version[VERSION_SIZE]; + uint8_t max_cdb_sz; + uint8_t ha; + uint16_t init_id; + uint16_t max_sectors; + uint16_t cmd_per_lun; + atomic_t being_detached; +} adapter_t; + +#define SCSI_FREE_LIST_LOCK(adapter) (&adapter->kscb_pool_lock) +#define USER_FREE_LIST_LOCK(adapter) (&adapter->uscb_pool_lock) +#define PENDING_LIST_LOCK(adapter) (&adapter->pend_list_lock) +#define COMPLETED_LIST_LOCK(adapter) (&adapter->completed_list_lock) + + +// conversion from scsi command +#define SCP2HOST(scp) (scp)->device->host // to host +#define SCP2HOSTDATA(scp) SCP2HOST(scp)->hostdata // to soft state +#define SCP2CHANNEL(scp) (scp)->device->channel // to channel +#define SCP2TARGET(scp) (scp)->device->id // to target +#define SCP2LUN(scp) (scp)->device->lun // to LUN + +// generic macro to convert scsi command and host to controller's soft state +#define SCSIHOST2ADAP(host) (((caddr_t *)(host->hostdata))[0]) +#define SCP2ADAPTER(scp) (adapter_t *)SCSIHOST2ADAP(SCP2HOST(scp)) + + +/** + * MRAID_GET_DEVICE_MAP - device ids + * @param adp - Adapter's soft state + * @param scp - mid-layer scsi command pointer + * @param p_chan - physical channel on the controller + * @param target - target id of the device or logical drive number + * @param islogical - set if the command is for the logical drive + * + * Macro to retrieve information about device class, logical or physical and + * the corresponding physical channel and target or logical drive number + **/ +#define MRAID_IS_LOGICAL(adp, scp) \ + (SCP2CHANNEL(scp) == (adp)->max_channel) ? 1 : 0 + +#define MRAID_IS_LOGICAL_SDEV(adp, sdev) \ + (sdev->channel == (adp)->max_channel) ? 1 : 0 + +#define MRAID_GET_DEVICE_MAP(adp, scp, p_chan, target, islogical) \ + /* \ + * Is the request coming for the virtual channel \ + */ \ + islogical = MRAID_IS_LOGICAL(adp, scp); \ + \ + /* \ + * Get an index into our table of drive ids mapping \ + */ \ + if (islogical) { \ + p_chan = 0xFF; \ + target = \ + (adp)->device_ids[(adp)->max_channel][SCP2TARGET(scp)]; \ + } \ + else { \ + p_chan = ((adp)->device_ids[SCP2CHANNEL(scp)] \ + [SCP2TARGET(scp)] >> 8) & 0xFF; \ + target = ((adp)->device_ids[SCP2CHANNEL(scp)] \ + [SCP2TARGET(scp)] & 0xFF); \ + } + +/* + * ### Helper routines ### + */ +#define LSI_DBGLVL mraid_debug_level // each LLD must define a global + // mraid_debug_level + +#ifdef DEBUG +#if defined (_ASSERT_PANIC) +#define ASSERT_ACTION panic +#else +#define ASSERT_ACTION printk +#endif + +#define ASSERT(expression) \ + if (!(expression)) { \ + ASSERT_ACTION("assertion failed:(%s), file: %s, line: %d:%s\n", \ + #expression, __FILE__, __LINE__, __FUNCTION__); \ + } +#else +#define ASSERT(expression) +#endif + +/* + * struct mraid_pci_blk - structure holds DMA memory block info + * @param vaddr : virtual address to a memory block + * @param dma_addr : DMA handle to a memory block + * + * This structure is filled up for the caller. It is the responsibilty of the + * caller to allocate this array big enough to store addresses for all + * requested elements + */ +struct mraid_pci_blk { + caddr_t vaddr; + dma_addr_t dma_addr; +}; + +#endif // _MEGA_COMMON_H_ + +// vim: set ts=8 sw=8 tw=78: |