1 files changed, 576 insertions, 0 deletions

diff --git a/drivers/s390/block/dasd_int.h b/drivers/s390/block/dasd_int.h
new file mode 100644
index 000000000000..4586e0ecc526
--- /dev/null
+++ b/drivers/s390/block/dasd_int.h
@@ -0,0 +1,576 @@
+/* 
+ * File...........: linux/drivers/s390/block/dasd_int.h
+ * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
+ *                  Horst Hummel <Horst.Hummel@de.ibm.com> 
+ *                  Martin Schwidefsky <schwidefsky@de.ibm.com>
+ * Bugreports.to..: <Linux390@de.ibm.com>
+ * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
+ *
+ * $Revision: 1.63 $
+ */
+
+#ifndef DASD_INT_H
+#define DASD_INT_H
+
+#ifdef __KERNEL__
+
+/* erp debugging in dasd.c and dasd_3990_erp.c */
+#define ERP_DEBUG
+
+
+/* we keep old device allocation scheme; IOW, minors are still in 0..255 */
+#define DASD_PER_MAJOR (1U << (MINORBITS - DASD_PARTN_BITS))
+#define DASD_PARTN_MASK ((1 << DASD_PARTN_BITS) - 1)
+
+/*
+ * States a dasd device can have:
+ *   new: the dasd_device structure is allocated.
+ *   known: the discipline for the device is identified.
+ *   basic: the device can do basic i/o.
+ *   accept: the device is analysed (format is known).
+ *   ready: partition detection is done and the device is can do block io.
+ *   online: the device accepts requests from the block device queue.
+ *
+ * Things to do for startup state transitions:
+ *   new -> known: find discipline for the device and create devfs entries.
+ *   known -> basic: request irq line for the device.
+ *   basic -> ready: do the initial analysis, e.g. format detection,
+ *                   do block device setup and detect partitions.
+ *   ready -> online: schedule the device tasklet.
+ * Things to do for shutdown state transitions:
+ *   online -> ready: just set the new device state.
+ *   ready -> basic: flush requests from the block device layer, clear
+ *                   partition information and reset format information.
+ *   basic -> known: terminate all requests and free irq.
+ *   known -> new: remove devfs entries and forget discipline.
+ */
+
+#define DASD_STATE_NEW    0
+#define DASD_STATE_KNOWN  1
+#define DASD_STATE_BASIC  2
+#define DASD_STATE_READY  3
+#define DASD_STATE_ONLINE 4
+
+#include <linux/module.h>
+#include <linux/wait.h>
+#include <linux/blkdev.h>
+#include <linux/devfs_fs_kernel.h>
+#include <linux/genhd.h>
+#include <linux/hdreg.h>
+#include <linux/interrupt.h>
+#include <asm/ccwdev.h>
+#include <linux/workqueue.h>
+#include <asm/debug.h>
+#include <asm/dasd.h>
+#include <asm/idals.h>
+
+/*
+ * SECTION: Type definitions
+ */
+struct dasd_device;
+
+typedef int (*dasd_ioctl_fn_t) (struct block_device *bdev, int no, long args);
+
+struct dasd_ioctl {
+        struct list_head list;
+        struct module *owner;
+        int no;
+        dasd_ioctl_fn_t handler;
+};
+
+typedef enum {
+        dasd_era_fatal = -1,    /* no chance to recover              */
+        dasd_era_none = 0,      /* don't recover, everything alright */
+        dasd_era_msg = 1,       /* don't recover, just report...     */
+        dasd_era_recover = 2    /* recovery action recommended       */
+} dasd_era_t;
+
+/* BIT DEFINITIONS FOR SENSE DATA */
+#define DASD_SENSE_BIT_0 0x80
+#define DASD_SENSE_BIT_1 0x40
+#define DASD_SENSE_BIT_2 0x20
+#define DASD_SENSE_BIT_3 0x10
+
+/*
+ * SECTION: MACROs for klogd and s390 debug feature (dbf)
+ */
+#define DBF_DEV_EVENT(d_level, d_device, d_str, d_data...) \
+do { \
+        debug_sprintf_event(d_device->debug_area, \
+                            d_level, \
+                            d_str "\n", \
+                            d_data); \
+} while(0)
+
+#define DBF_DEV_EXC(d_level, d_device, d_str, d_data...) \
+do { \
+        debug_sprintf_exception(d_device->debug_area, \
+                                d_level, \
+                                d_str "\n", \
+                                d_data); \
+} while(0)
+
+#define DBF_EVENT(d_level, d_str, d_data...)\
+do { \
+        debug_sprintf_event(dasd_debug_area, \
+                            d_level,\
+                            d_str "\n", \
+                            d_data); \
+} while(0)
+
+#define DBF_EXC(d_level, d_str, d_data...)\
+do { \
+        debug_sprintf_exception(dasd_debug_area, \
+                                d_level,\
+                                d_str "\n", \
+                                d_data); \
+} while(0)
+
+/* definition of dbf debug levels */
+#define DBF_EMERG       0       /* system is unusable                   */
+#define DBF_ALERT       1       /* action must be taken immediately     */
+#define DBF_CRIT        2       /* critical conditions                  */
+#define DBF_ERR         3       /* error conditions                     */
+#define DBF_WARNING     4       /* warning conditions                   */
+#define DBF_NOTICE      5       /* normal but significant condition     */
+#define DBF_INFO        6       /* informational                        */
+#define DBF_DEBUG       6       /* debug-level messages                 */
+
+/* messages to be written via klogd and dbf */
+#define DEV_MESSAGE(d_loglevel,d_device,d_string,d_args...)\
+do { \
+        printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \
+               d_device->cdev->dev.bus_id, d_args); \
+        DBF_DEV_EVENT(DBF_ALERT, d_device, d_string, d_args); \
+} while(0)
+
+#define MESSAGE(d_loglevel,d_string,d_args...)\
+do { \
+        printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \
+        DBF_EVENT(DBF_ALERT, d_string, d_args); \
+} while(0)
+
+/* messages to be written via klogd only */
+#define DEV_MESSAGE_LOG(d_loglevel,d_device,d_string,d_args...)\
+do { \
+        printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \
+               d_device->cdev->dev.bus_id, d_args); \
+} while(0)
+
+#define MESSAGE_LOG(d_loglevel,d_string,d_args...)\
+do { \
+        printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \
+} while(0)
+
+struct dasd_ccw_req {
+        unsigned int magic;             /* Eye catcher */
+        struct list_head list;          /* list_head for request queueing. */
+
+        /* Where to execute what... */
+        struct dasd_device *device;     /* device the request is for */
+        struct ccw1 *cpaddr;            /* address of channel program */
+        char status;                    /* status of this request */
+        short retries;                  /* A retry counter */
+        unsigned long flags;            /* flags of this request */
+
+        /* ... and how */
+        unsigned long starttime;        /* jiffies time of request start */
+        int expires;                    /* expiration period in jiffies */
+        char lpm;                       /* logical path mask */
+        void *data;                     /* pointer to data area */
+
+        /* these are important for recovering erroneous requests          */
+        struct irb irb;                 /* device status in case of an error */
+        struct dasd_ccw_req *refers;    /* ERP-chain queueing. */
+        void *function;                 /* originating ERP action */
+
+        /* these are for statistics only */
+        unsigned long long buildclk;    /* TOD-clock of request generation */
+        unsigned long long startclk;    /* TOD-clock of request start */
+        unsigned long long stopclk;     /* TOD-clock of request interrupt */
+        unsigned long long endclk;      /* TOD-clock of request termination */
+
+        /* Callback that is called after reaching final status. */
+        void (*callback)(struct dasd_ccw_req *, void *data);
+        void *callback_data;
+};
+
+/* 
+ * dasd_ccw_req -> status can be:
+ */
+#define DASD_CQR_FILLED   0x00  /* request is ready to be processed */
+#define DASD_CQR_QUEUED   0x01  /* request is queued to be processed */
+#define DASD_CQR_IN_IO    0x02  /* request is currently in IO */
+#define DASD_CQR_DONE     0x03  /* request is completed successfully */
+#define DASD_CQR_ERROR    0x04  /* request is completed with error */
+#define DASD_CQR_FAILED   0x05  /* request is finally failed */
+#define DASD_CQR_CLEAR    0x06  /* request is clear pending */
+
+/* per dasd_ccw_req flags */
+#define DASD_CQR_FLAGS_USE_ERP   0      /* use ERP for this request */
+
+/* Signature for error recovery functions. */
+typedef struct dasd_ccw_req *(*dasd_erp_fn_t) (struct dasd_ccw_req *);
+
+/*
+ * the struct dasd_discipline is
+ * sth like a table of virtual functions, if you think of dasd_eckd
+ * inheriting dasd...
+ * no, currently we are not planning to reimplement the driver in C++
+ */
+struct dasd_discipline {
+        struct module *owner;
+        char ebcname[8];        /* a name used for tagging and printks */
+        char name[8];           /* a name used for tagging and printks */
+        int max_blocks;         /* maximum number of blocks to be chained */
+
+        struct list_head list;  /* used for list of disciplines */
+
+        /*
+         * Device recognition functions. check_device is used to verify
+         * the sense data and the information returned by read device
+         * characteristics. It returns 0 if the discipline can be used
+         * for the device in question.
+         * do_analysis is used in the step from device state "basic" to
+         * state "accept". It returns 0 if the device can be made ready,
+         * it returns -EMEDIUMTYPE if the device can't be made ready or
+         * -EAGAIN if do_analysis started a ccw that needs to complete
+         * before the analysis may be repeated.
+         */
+        int (*check_device)(struct dasd_device *);
+        int (*do_analysis) (struct dasd_device *);
+
+        /*
+         * Device operation functions. build_cp creates a ccw chain for
+         * a block device request, start_io starts the request and
+         * term_IO cancels it (e.g. in case of a timeout). format_device
+         * returns a ccw chain to be used to format the device.
+         */
+        struct dasd_ccw_req *(*build_cp) (struct dasd_device *,
+                                          struct request *);
+        int (*start_IO) (struct dasd_ccw_req *);
+        int (*term_IO) (struct dasd_ccw_req *);
+        struct dasd_ccw_req *(*format_device) (struct dasd_device *,
+                                               struct format_data_t *);
+        int (*free_cp) (struct dasd_ccw_req *, struct request *);
+        /*
+         * Error recovery functions. examine_error() returns a value that
+         * indicates what to do for an error condition. If examine_error()
+         * returns 'dasd_era_recover' erp_action() is called to create a 
+         * special error recovery ccw. erp_postaction() is called after
+         * an error recovery ccw has finished its execution. dump_sense
+         * is called for every error condition to print the sense data
+         * to the console.
+         */
+        dasd_era_t(*examine_error) (struct dasd_ccw_req *, struct irb *);
+        dasd_erp_fn_t(*erp_action) (struct dasd_ccw_req *);
+        dasd_erp_fn_t(*erp_postaction) (struct dasd_ccw_req *);
+        void (*dump_sense) (struct dasd_device *, struct dasd_ccw_req *,
+                            struct irb *);
+
+        /* i/o control functions. */
+        int (*fill_geometry) (struct dasd_device *, struct hd_geometry *);
+        int (*fill_info) (struct dasd_device *, struct dasd_information2_t *);
+};
+
+extern struct dasd_discipline *dasd_diag_discipline_pointer;
+
+struct dasd_device {
+        /* Block device stuff. */
+        struct gendisk *gdp;
+        request_queue_t *request_queue;
+        spinlock_t request_queue_lock;
+        struct block_device *bdev;
+        unsigned int devindex;
+        unsigned long blocks;           /* size of volume in blocks */
+        unsigned int bp_block;          /* bytes per block */
+        unsigned int s2b_shift;         /* log2 (bp_block/512) */
+        unsigned long flags;            /* per device flags */
+
+        /* Device discipline stuff. */
+        struct dasd_discipline *discipline;
+        char *private;
+
+        /* Device state and target state. */
+        int state, target;
+        int stopped;            /* device (ccw_device_start) was stopped */
+
+        /* Open and reference count. */
+        atomic_t ref_count;
+        atomic_t open_count;
+
+        /* ccw queue and memory for static ccw/erp buffers. */
+        struct list_head ccw_queue;
+        spinlock_t mem_lock;
+        void *ccw_mem;
+        void *erp_mem;
+        struct list_head ccw_chunks;
+        struct list_head erp_chunks;
+
+        atomic_t tasklet_scheduled;
+        struct tasklet_struct tasklet;
+        struct work_struct kick_work;
+        struct timer_list timer;
+
+        debug_info_t *debug_area;
+
+        struct ccw_device *cdev;
+
+#ifdef CONFIG_DASD_PROFILE
+        struct dasd_profile_info_t profile;
+#endif
+};
+
+/* reasons why device (ccw_device_start) was stopped */
+#define DASD_STOPPED_NOT_ACC 1         /* not accessible */
+#define DASD_STOPPED_QUIESCE 2         /* Quiesced */
+#define DASD_STOPPED_PENDING 4         /* long busy */
+#define DASD_STOPPED_DC_WAIT 8         /* disconnected, wait */
+#define DASD_STOPPED_DC_EIO  16        /* disconnected, return -EIO */
+
+/* per device flags */
+#define DASD_FLAG_RO            0       /* device is read-only */
+#define DASD_FLAG_USE_DIAG      1       /* use diag disciplnie */
+#define DASD_FLAG_DSC_ERROR     2       /* return -EIO when disconnected */
+#define DASD_FLAG_OFFLINE       3       /* device is in offline processing */
+
+void dasd_put_device_wake(struct dasd_device *);
+
+/*
+ * Reference count inliners
+ */
+static inline void
+dasd_get_device(struct dasd_device *device)
+{
+        atomic_inc(&device->ref_count);
+}
+
+static inline void
+dasd_put_device(struct dasd_device *device)
+{
+        if (atomic_dec_return(&device->ref_count) == 0)
+                dasd_put_device_wake(device);
+}
+
+/*
+ * The static memory in ccw_mem and erp_mem is managed by a sorted
+ * list of free memory chunks.
+ */
+struct dasd_mchunk
+{
+        struct list_head list;
+        unsigned long size;
+} __attribute__ ((aligned(8)));
+
+static inline void
+dasd_init_chunklist(struct list_head *chunk_list, void *mem,
+                    unsigned long size)
+{
+        struct dasd_mchunk *chunk;
+
+        INIT_LIST_HEAD(chunk_list);
+        chunk = (struct dasd_mchunk *) mem;
+        chunk->size = size - sizeof(struct dasd_mchunk);
+        list_add(&chunk->list, chunk_list);
+}
+
+static inline void *
+dasd_alloc_chunk(struct list_head *chunk_list, unsigned long size)
+{
+        struct dasd_mchunk *chunk, *tmp;
+
+        size = (size + 7L) & -8L;
+        list_for_each_entry(chunk, chunk_list, list) {
+                if (chunk->size < size)
+                        continue;
+                if (chunk->size > size + sizeof(struct dasd_mchunk)) {
+                        char *endaddr = (char *) (chunk + 1) + chunk->size;
+                        tmp = (struct dasd_mchunk *) (endaddr - size) - 1;
+                        tmp->size = size;
+                        chunk->size -= size + sizeof(struct dasd_mchunk);
+                        chunk = tmp;
+                } else
+                        list_del(&chunk->list);
+                return (void *) (chunk + 1);
+        }
+        return NULL;
+}
+
+static inline void
+dasd_free_chunk(struct list_head *chunk_list, void *mem)
+{
+        struct dasd_mchunk *chunk, *tmp;
+        struct list_head *p, *left;
+
+        chunk = (struct dasd_mchunk *)
+                ((char *) mem - sizeof(struct dasd_mchunk));
+        /* Find out the left neighbour in chunk_list. */
+        left = chunk_list;
+        list_for_each(p, chunk_list) {
+                if (list_entry(p, struct dasd_mchunk, list) > chunk)
+                        break;
+                left = p;
+        }
+        /* Try to merge with right neighbour = next element from left. */
+        if (left->next != chunk_list) {
+                tmp = list_entry(left->next, struct dasd_mchunk, list);
+                if ((char *) (chunk + 1) + chunk->size == (char *) tmp) {
+                        list_del(&tmp->list);
+                        chunk->size += tmp->size + sizeof(struct dasd_mchunk);
+                }
+        }
+        /* Try to merge with left neighbour. */
+        if (left != chunk_list) {
+                tmp = list_entry(left, struct dasd_mchunk, list);
+                if ((char *) (tmp + 1) + tmp->size == (char *) chunk) {
+                        tmp->size += chunk->size + sizeof(struct dasd_mchunk);
+                        return;
+                }
+        }
+        __list_add(&chunk->list, left, left->next);
+}
+
+/*
+ * Check if bsize is in { 512, 1024, 2048, 4096 }
+ */
+static inline int
+dasd_check_blocksize(int bsize)
+{
+        if (bsize < 512 || bsize > 4096 || (bsize & (bsize - 1)) != 0)
+                return -EMEDIUMTYPE;
+        return 0;
+}
+
+/* externals in dasd.c */
+#define DASD_PROFILE_ON  1
+#define DASD_PROFILE_OFF 0
+
+extern debug_info_t *dasd_debug_area;
+extern struct dasd_profile_info_t dasd_global_profile;
+extern unsigned int dasd_profile_level;
+extern struct block_device_operations dasd_device_operations;
+
+extern kmem_cache_t *dasd_page_cache;
+
+struct dasd_ccw_req *
+dasd_kmalloc_request(char *, int, int, struct dasd_device *);
+struct dasd_ccw_req *
+dasd_smalloc_request(char *, int, int, struct dasd_device *);
+void dasd_kfree_request(struct dasd_ccw_req *, struct dasd_device *);
+void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *);
+
+static inline int
+dasd_kmalloc_set_cda(struct ccw1 *ccw, void *cda, struct dasd_device *device)
+{
+        return set_normalized_cda(ccw, cda);
+}
+
+struct dasd_device *dasd_alloc_device(void);
+void dasd_free_device(struct dasd_device *);
+
+void dasd_enable_device(struct dasd_device *);
+void dasd_set_target_state(struct dasd_device *, int);
+void dasd_kick_device(struct dasd_device *);
+
+void dasd_add_request_head(struct dasd_ccw_req *);
+void dasd_add_request_tail(struct dasd_ccw_req *);
+int  dasd_start_IO(struct dasd_ccw_req *);
+int  dasd_term_IO(struct dasd_ccw_req *);
+void dasd_schedule_bh(struct dasd_device *);
+int  dasd_sleep_on(struct dasd_ccw_req *);
+int  dasd_sleep_on_immediatly(struct dasd_ccw_req *);
+int  dasd_sleep_on_interruptible(struct dasd_ccw_req *);
+void dasd_set_timer(struct dasd_device *, int);
+void dasd_clear_timer(struct dasd_device *);
+int  dasd_cancel_req(struct dasd_ccw_req *);
+int dasd_generic_probe (struct ccw_device *, struct dasd_discipline *);
+void dasd_generic_remove (struct ccw_device *cdev);
+int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *);
+int dasd_generic_set_offline (struct ccw_device *cdev);
+int dasd_generic_notify(struct ccw_device *, int);
+void dasd_generic_auto_online (struct ccw_driver *);
+
+/* externals in dasd_devmap.c */
+extern int dasd_max_devindex;
+extern int dasd_probeonly;
+extern int dasd_autodetect;
+
+int dasd_devmap_init(void);
+void dasd_devmap_exit(void);
+
+struct dasd_device *dasd_create_device(struct ccw_device *);
+void dasd_delete_device(struct dasd_device *);
+
+int dasd_add_sysfs_files(struct ccw_device *);
+void dasd_remove_sysfs_files(struct ccw_device *);
+
+struct dasd_device *dasd_device_from_cdev(struct ccw_device *);
+struct dasd_device *dasd_device_from_devindex(int);
+
+int dasd_parse(void);
+int dasd_busid_known(char *);
+
+/* externals in dasd_gendisk.c */
+int  dasd_gendisk_init(void);
+void dasd_gendisk_exit(void);
+int dasd_gendisk_alloc(struct dasd_device *);
+void dasd_gendisk_free(struct dasd_device *);
+int dasd_scan_partitions(struct dasd_device *);
+void dasd_destroy_partitions(struct dasd_device *);
+
+/* externals in dasd_ioctl.c */
+int  dasd_ioctl_init(void);
+void dasd_ioctl_exit(void);
+int  dasd_ioctl_no_register(struct module *, int, dasd_ioctl_fn_t);
+int  dasd_ioctl_no_unregister(struct module *, int, dasd_ioctl_fn_t);
+int  dasd_ioctl(struct inode *, struct file *, unsigned int, unsigned long);
+
+/* externals in dasd_proc.c */
+int dasd_proc_init(void);
+void dasd_proc_exit(void);
+
+/* externals in dasd_erp.c */
+struct dasd_ccw_req *dasd_default_erp_action(struct dasd_ccw_req *);
+struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *);
+struct dasd_ccw_req *dasd_alloc_erp_request(char *, int, int,
+                                            struct dasd_device *);
+void dasd_free_erp_request(struct dasd_ccw_req *, struct dasd_device *);
+void dasd_log_sense(struct dasd_ccw_req *, struct irb *);
+void dasd_log_ccw(struct dasd_ccw_req *, int, __u32);
+
+/* externals in dasd_3370_erp.c */
+dasd_era_t dasd_3370_erp_examine(struct dasd_ccw_req *, struct irb *);
+
+/* externals in dasd_3990_erp.c */
+dasd_era_t dasd_3990_erp_examine(struct dasd_ccw_req *, struct irb *);
+struct dasd_ccw_req *dasd_3990_erp_action(struct dasd_ccw_req *);
+
+/* externals in dasd_9336_erp.c */
+dasd_era_t dasd_9336_erp_examine(struct dasd_ccw_req *, struct irb *);
+
+/* externals in dasd_9336_erp.c */
+dasd_era_t dasd_9343_erp_examine(struct dasd_ccw_req *, struct irb *);
+struct dasd_ccw_req *dasd_9343_erp_action(struct dasd_ccw_req *);
+
+#endif                          /* __KERNEL__ */
+
+#endif                          /* DASD_H */
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-indent-level: 4 
+ * c-brace-imaginary-offset: 0
+ * c-brace-offset: -4
+ * c-argdecl-indent: 4
+ * c-label-offset: -4
+ * c-continued-statement-offset: 4
+ * c-continued-brace-offset: 0
+ * indent-tabs-mode: 1
+ * tab-width: 8
+ * End:
+ */