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https://github.com/torvalds/linux
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ad2b93123d
This patch adds per disk queue functionality to cciss. Sometime back I submitted a patch but it looks like only part of what I needed. In the 2.6 kernel if we have more than one logical volume the driver will Oops during rmmod. It seems all of the queues actually point back to the same queue. So after deleting the first volume you hit a null pointer on the second one. This has been tested in our labs. There is no difference in performance, it just fixes the Oops. Signed-off-by: Mike Miller <mike.miller@hp.com> Cc: Jens Axboe <axboe@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
266 lines
6.1 KiB
C
266 lines
6.1 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 "cciss_cmd.h"
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#define NWD 16
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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 MAJOR_NR COMPAQ_CISS_MAJOR
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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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unsigned long (*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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__u32 LunID;
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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;
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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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unsigned long io_mem_addr;
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unsigned long io_mem_length;
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CfgTable_struct __iomem *cfgtable;
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unsigned int intr;
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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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// 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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CommandList_struct *reqQ;
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CommandList_struct *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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/* 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[NWD];
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#ifdef CONFIG_CISS_SCSI_TAPE
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void *scsi_ctlr; /* ptr to structure containing scsi related stuff */
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#endif
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};
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/* Defining the diffent access_menthods */
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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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#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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/*
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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("Sending %x - down to controller\n", 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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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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/*
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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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/*
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* Returns true if an interrupt is pending..
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*/
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static unsigned long 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 unsigned long 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 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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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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};
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#define CCISS_LOCK(i) (&hba[i]->lock)
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#endif /* CCISS_H */
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