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1ddd504954
Under certain workloads a command may seem to get lost. IOW, the Smart Array thinks all commands have been completed but we still have commands in our completion queue. This may lead to system instability, filesystems going read-only, or even panics depending on the affected filesystem. We add an extra read to force the write to complete. Testing shows this extra read avoids the problem. Signed-off-by: Mike Miller <mike.miller@hp.com> Cc: stable@kernel.org Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
428 lines
11 KiB
C
428 lines
11 KiB
C
#ifndef CCISS_H
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#define CCISS_H
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#include <linux/genhd.h>
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#include <linux/mutex.h>
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#include "cciss_cmd.h"
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#define NWD_SHIFT 4
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#define MAX_PART (1 << NWD_SHIFT)
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#define IO_OK 0
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#define IO_ERROR 1
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#define IO_NEEDS_RETRY 3
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#define VENDOR_LEN 8
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#define MODEL_LEN 16
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#define REV_LEN 4
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struct ctlr_info;
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typedef struct ctlr_info ctlr_info_t;
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struct access_method {
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void (*submit_command)(ctlr_info_t *h, CommandList_struct *c);
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void (*set_intr_mask)(ctlr_info_t *h, unsigned long val);
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unsigned long (*fifo_full)(ctlr_info_t *h);
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bool (*intr_pending)(ctlr_info_t *h);
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unsigned long (*command_completed)(ctlr_info_t *h);
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};
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typedef struct _drive_info_struct
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{
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unsigned char LunID[8];
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int usage_count;
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struct request_queue *queue;
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sector_t nr_blocks;
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int block_size;
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int heads;
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int sectors;
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int cylinders;
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int raid_level; /* set to -1 to indicate that
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* the drive is not in use/configured
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*/
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int busy_configuring; /* This is set when a drive is being removed
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* to prevent it from being opened or it's
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* queue from being started.
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*/
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struct device dev;
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__u8 serial_no[16]; /* from inquiry page 0x83,
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* not necc. null terminated.
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*/
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char vendor[VENDOR_LEN + 1]; /* SCSI vendor string */
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char model[MODEL_LEN + 1]; /* SCSI model string */
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char rev[REV_LEN + 1]; /* SCSI revision string */
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char device_initialized; /* indicates whether dev is initialized */
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} drive_info_struct;
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struct ctlr_info
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{
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int ctlr;
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char devname[8];
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char *product_name;
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char firm_ver[4]; /* Firmware version */
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struct pci_dev *pdev;
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__u32 board_id;
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void __iomem *vaddr;
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unsigned long paddr;
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int nr_cmds; /* Number of commands allowed on this controller */
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CfgTable_struct __iomem *cfgtable;
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int interrupts_enabled;
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int major;
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int max_commands;
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int commands_outstanding;
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int max_outstanding; /* Debug */
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int num_luns;
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int highest_lun;
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int usage_count; /* number of opens all all minor devices */
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/* Need space for temp sg list
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* number of scatter/gathers supported
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* number of scatter/gathers in chained block
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*/
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struct scatterlist **scatter_list;
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int maxsgentries;
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int chainsize;
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int max_cmd_sgentries;
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SGDescriptor_struct **cmd_sg_list;
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# define PERF_MODE_INT 0
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# define DOORBELL_INT 1
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# define SIMPLE_MODE_INT 2
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# define MEMQ_MODE_INT 3
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unsigned int intr[4];
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unsigned int msix_vector;
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unsigned int msi_vector;
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int cciss_max_sectors;
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BYTE cciss_read;
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BYTE cciss_write;
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BYTE cciss_read_capacity;
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/* information about each logical volume */
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drive_info_struct *drv[CISS_MAX_LUN];
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struct access_method access;
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/* queue and queue Info */
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struct list_head reqQ;
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struct list_head cmpQ;
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unsigned int Qdepth;
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unsigned int maxQsinceinit;
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unsigned int maxSG;
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spinlock_t lock;
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/* pointers to command and error info pool */
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CommandList_struct *cmd_pool;
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dma_addr_t cmd_pool_dhandle;
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ErrorInfo_struct *errinfo_pool;
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dma_addr_t errinfo_pool_dhandle;
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unsigned long *cmd_pool_bits;
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int nr_allocs;
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int nr_frees;
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int busy_configuring;
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int busy_initializing;
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int busy_scanning;
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struct mutex busy_shutting_down;
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/* This element holds the zero based queue number of the last
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* queue to be started. It is used for fairness.
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*/
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int next_to_run;
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/* Disk structures we need to pass back */
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struct gendisk *gendisk[CISS_MAX_LUN];
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#ifdef CONFIG_CISS_SCSI_TAPE
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struct cciss_scsi_adapter_data_t *scsi_ctlr;
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#endif
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unsigned char alive;
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struct list_head scan_list;
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struct completion scan_wait;
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struct device dev;
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/*
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* Performant mode tables.
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*/
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u32 trans_support;
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u32 trans_offset;
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struct TransTable_struct *transtable;
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unsigned long transMethod;
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/*
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* Performant mode completion buffer
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*/
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u64 *reply_pool;
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dma_addr_t reply_pool_dhandle;
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u64 *reply_pool_head;
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size_t reply_pool_size;
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unsigned char reply_pool_wraparound;
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u32 *blockFetchTable;
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};
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/* Defining the diffent access_methods
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*
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* Memory mapped FIFO interface (SMART 53xx cards)
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*/
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#define SA5_DOORBELL 0x20
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#define SA5_REQUEST_PORT_OFFSET 0x40
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#define SA5_REPLY_INTR_MASK_OFFSET 0x34
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#define SA5_REPLY_PORT_OFFSET 0x44
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#define SA5_INTR_STATUS 0x30
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#define SA5_SCRATCHPAD_OFFSET 0xB0
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#define SA5_CTCFG_OFFSET 0xB4
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#define SA5_CTMEM_OFFSET 0xB8
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#define SA5_INTR_OFF 0x08
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#define SA5B_INTR_OFF 0x04
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#define SA5_INTR_PENDING 0x08
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#define SA5B_INTR_PENDING 0x04
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#define FIFO_EMPTY 0xffffffff
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#define CCISS_FIRMWARE_READY 0xffff0000 /* value in scratchpad register */
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/* Perf. mode flags */
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#define SA5_PERF_INTR_PENDING 0x04
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#define SA5_PERF_INTR_OFF 0x05
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#define SA5_OUTDB_STATUS_PERF_BIT 0x01
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#define SA5_OUTDB_CLEAR_PERF_BIT 0x01
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#define SA5_OUTDB_CLEAR 0xA0
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#define SA5_OUTDB_CLEAR_PERF_BIT 0x01
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#define SA5_OUTDB_STATUS 0x9C
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#define CISS_ERROR_BIT 0x02
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#define CCISS_INTR_ON 1
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#define CCISS_INTR_OFF 0
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/* CCISS_BOARD_READY_WAIT_SECS is how long to wait for a board
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* to become ready, in seconds, before giving up on it.
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* CCISS_BOARD_READY_POLL_INTERVAL_MSECS * is how long to wait
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* between polling the board to see if it is ready, in
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* milliseconds. CCISS_BOARD_READY_ITERATIONS is derived
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* the above.
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*/
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#define CCISS_BOARD_READY_WAIT_SECS (120)
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#define CCISS_BOARD_NOT_READY_WAIT_SECS (10)
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#define CCISS_BOARD_READY_POLL_INTERVAL_MSECS (100)
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#define CCISS_BOARD_READY_ITERATIONS \
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((CCISS_BOARD_READY_WAIT_SECS * 1000) / \
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CCISS_BOARD_READY_POLL_INTERVAL_MSECS)
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#define CCISS_BOARD_NOT_READY_ITERATIONS \
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((CCISS_BOARD_NOT_READY_WAIT_SECS * 1000) / \
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CCISS_BOARD_READY_POLL_INTERVAL_MSECS)
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#define CCISS_POST_RESET_PAUSE_MSECS (3000)
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#define CCISS_POST_RESET_NOOP_INTERVAL_MSECS (1000)
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#define CCISS_POST_RESET_NOOP_RETRIES (12)
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/*
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Send the command to the hardware
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*/
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static void SA5_submit_command( ctlr_info_t *h, CommandList_struct *c)
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{
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#ifdef CCISS_DEBUG
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printk(KERN_WARNING "cciss%d: Sending %08x - down to controller\n",
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h->ctlr, c->busaddr);
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#endif /* CCISS_DEBUG */
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writel(c->busaddr, h->vaddr + SA5_REQUEST_PORT_OFFSET);
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readl(h->vaddr + SA5_REQUEST_PORT_OFFSET);
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h->commands_outstanding++;
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if ( h->commands_outstanding > h->max_outstanding)
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h->max_outstanding = h->commands_outstanding;
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}
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/*
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* This card is the opposite of the other cards.
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* 0 turns interrupts on...
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* 0x08 turns them off...
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*/
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static void SA5_intr_mask(ctlr_info_t *h, unsigned long val)
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{
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if (val)
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{ /* Turn interrupts on */
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h->interrupts_enabled = 1;
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writel(0, h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
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} else /* Turn them off */
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{
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h->interrupts_enabled = 0;
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writel( SA5_INTR_OFF,
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h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
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}
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}
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/*
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* This card is the opposite of the other cards.
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* 0 turns interrupts on...
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* 0x04 turns them off...
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*/
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static void SA5B_intr_mask(ctlr_info_t *h, unsigned long val)
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{
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if (val)
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{ /* Turn interrupts on */
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h->interrupts_enabled = 1;
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writel(0, h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
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} else /* Turn them off */
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{
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h->interrupts_enabled = 0;
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writel( SA5B_INTR_OFF,
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h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
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}
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}
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/* Performant mode intr_mask */
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static void SA5_performant_intr_mask(ctlr_info_t *h, unsigned long val)
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{
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if (val) { /* turn on interrupts */
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h->interrupts_enabled = 1;
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writel(0, h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
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} else {
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h->interrupts_enabled = 0;
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writel(SA5_PERF_INTR_OFF,
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h->vaddr + SA5_REPLY_INTR_MASK_OFFSET);
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}
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}
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/*
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* Returns true if fifo is full.
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*
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*/
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static unsigned long SA5_fifo_full(ctlr_info_t *h)
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{
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if( h->commands_outstanding >= h->max_commands)
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return(1);
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else
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return(0);
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}
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/*
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* returns value read from hardware.
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* returns FIFO_EMPTY if there is nothing to read
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*/
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static unsigned long SA5_completed(ctlr_info_t *h)
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{
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unsigned long register_value
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= readl(h->vaddr + SA5_REPLY_PORT_OFFSET);
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if(register_value != FIFO_EMPTY)
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{
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h->commands_outstanding--;
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#ifdef CCISS_DEBUG
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printk("cciss: Read %lx back from board\n", register_value);
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#endif /* CCISS_DEBUG */
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}
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#ifdef CCISS_DEBUG
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else
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{
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printk("cciss: FIFO Empty read\n");
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}
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#endif
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return ( register_value);
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}
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/* Performant mode command completed */
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static unsigned long SA5_performant_completed(ctlr_info_t *h)
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{
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unsigned long register_value = FIFO_EMPTY;
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/* flush the controller write of the reply queue by reading
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* outbound doorbell status register.
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*/
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register_value = readl(h->vaddr + SA5_OUTDB_STATUS);
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/* msi auto clears the interrupt pending bit. */
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if (!(h->msi_vector || h->msix_vector)) {
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writel(SA5_OUTDB_CLEAR_PERF_BIT, h->vaddr + SA5_OUTDB_CLEAR);
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/* Do a read in order to flush the write to the controller
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* (as per spec.)
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*/
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register_value = readl(h->vaddr + SA5_OUTDB_STATUS);
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}
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if ((*(h->reply_pool_head) & 1) == (h->reply_pool_wraparound)) {
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register_value = *(h->reply_pool_head);
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(h->reply_pool_head)++;
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h->commands_outstanding--;
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} else {
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register_value = FIFO_EMPTY;
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}
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/* Check for wraparound */
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if (h->reply_pool_head == (h->reply_pool + h->max_commands)) {
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h->reply_pool_head = h->reply_pool;
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h->reply_pool_wraparound ^= 1;
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}
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return register_value;
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}
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/*
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* Returns true if an interrupt is pending..
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*/
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static bool SA5_intr_pending(ctlr_info_t *h)
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{
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unsigned long register_value =
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readl(h->vaddr + SA5_INTR_STATUS);
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#ifdef CCISS_DEBUG
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printk("cciss: intr_pending %lx\n", register_value);
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#endif /* CCISS_DEBUG */
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if( register_value & SA5_INTR_PENDING)
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return 1;
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return 0 ;
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}
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/*
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* Returns true if an interrupt is pending..
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*/
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static bool SA5B_intr_pending(ctlr_info_t *h)
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{
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unsigned long register_value =
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readl(h->vaddr + SA5_INTR_STATUS);
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#ifdef CCISS_DEBUG
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printk("cciss: intr_pending %lx\n", register_value);
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#endif /* CCISS_DEBUG */
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if( register_value & SA5B_INTR_PENDING)
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return 1;
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return 0 ;
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}
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static bool SA5_performant_intr_pending(ctlr_info_t *h)
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{
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unsigned long register_value = readl(h->vaddr + SA5_INTR_STATUS);
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if (!register_value)
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return false;
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if (h->msi_vector || h->msix_vector)
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return true;
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/* Read outbound doorbell to flush */
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register_value = readl(h->vaddr + SA5_OUTDB_STATUS);
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return register_value & SA5_OUTDB_STATUS_PERF_BIT;
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}
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static struct access_method SA5_access = {
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SA5_submit_command,
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SA5_intr_mask,
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SA5_fifo_full,
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SA5_intr_pending,
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SA5_completed,
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};
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static struct access_method SA5B_access = {
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SA5_submit_command,
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SA5B_intr_mask,
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SA5_fifo_full,
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SA5B_intr_pending,
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SA5_completed,
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};
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static struct access_method SA5_performant_access = {
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SA5_submit_command,
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SA5_performant_intr_mask,
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SA5_fifo_full,
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SA5_performant_intr_pending,
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SA5_performant_completed,
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};
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struct board_type {
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__u32 board_id;
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char *product_name;
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struct access_method *access;
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int nr_cmds; /* Max cmds this kind of ctlr can handle. */
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};
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#endif /* CCISS_H */
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