Add ioctl(SG_SET_GET_EXTENDED) together with its interface: struct sg_extended_info which is 96 bytes long, only half of which is currently used. The "SET_GET" component of the name is to stress data flows towards and back from the ioctl.
That ioctl has three sections: one for getting and setting 32 bit quantities, a second section for manipulating boolean (bit) flags, and a final section for reading 32 bit quantities where a well known value is written and the corresponding value is read back. Several settings can be made in one invocation. See the webpage at: http://sg.danny.cz/sg/sg_v40.html specifically the section titled: "13 IOCTLs". Signed-off-by: Douglas Gilbert <dgilb...@interlog.com> --- drivers/scsi/sg.c | 252 +++++++++++++++++++++++++++++++++++++---- include/uapi/scsi/sg.h | 67 +++++++++++ 2 files changed, 295 insertions(+), 24 deletions(-) diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c index a261ad2c4567..c014fb24eca1 100644 --- a/drivers/scsi/sg.c +++ b/drivers/scsi/sg.c @@ -41,9 +41,9 @@ static char *sg_version_date = "20190520"; #include <linux/atomic.h> #include <linux/ratelimit.h> #include <linux/uio.h> -#include <linux/cred.h> /* for sg_check_file_access() */ +#include <linux/cred.h> /* for sg_check_file_access() */ #include <linux/bsg.h> -#include <linux/proc_fs.h> +#include <linux/proc_fs.h> /* used if CONFIG_SCSI_PROC_FS */ #include <scsi/scsi.h> #include <scsi/scsi_eh.h> @@ -120,7 +120,9 @@ enum sg_rq_state { #define SG_FFD_CMD_Q 1 /* clear: only 1 active req per fd */ #define SG_FFD_KEEP_ORPHAN 2 /* policy for this fd */ #define SG_FFD_MMAP_CALLED 3 /* mmap(2) system call made on fd */ +#define SG_FFD_TIME_IN_NS 4 /* set: time in nanoseconds, else ms */ #define SG_FFD_Q_AT_TAIL 5 /* set: queue reqs at tail of blk q */ +#define SG_FFD_NO_DURATION 9 /* don't do command duration calc */ int sg_big_buff = SG_DEF_RESERVED_SIZE; @@ -271,13 +273,12 @@ static void sg_rq_end_io(struct request *rq, blk_status_t status); static int sg_proc_init(void); static int sg_start_req(struct sg_request *srp, struct sg_comm_wr_t *cwrp, int dxfer_dir); -// static int sg_finish_rem_req(struct sg_request *srp); static void sg_finish_scsi_blk_rq(struct sg_request *srp); static int sg_mk_sgat(struct sg_request *srp, struct sg_fd *sfp, int minlen); static int sg_v3_submit(struct file *filp, struct sg_fd *sfp, struct sg_io_hdr *hp, bool sync, struct sg_request **o_srp); -static struct sg_request *sg_common_write(struct sg_comm_wr_t *cwp); +static struct sg_request *sg_common_write(struct sg_comm_wr_t *cwrp); static int sg_rd_append(struct sg_request *srp, void __user *outp, int num_xfer); static void sg_remove_sgat(struct sg_request *srp); @@ -302,6 +303,7 @@ static void sg_rep_rq_state_fail(struct sg_device *sdp, #define SZ_SG_IO_HDR ((int)sizeof(struct sg_io_hdr)) /* v3 header */ #define SZ_SG_IO_V4 ((int)sizeof(struct sg_io_v4)) /* v4 header (in bsg.h) */ #define SZ_SG_REQ_INFO ((int)sizeof(struct sg_req_info)) +#define SZ_SG_EXTENDED_INFO ((int)sizeof(struct sg_extended_info)) /* There is a assert that SZ_SG_IO_V4 >= SZ_SG_IO_HDR in first function */ @@ -440,11 +442,11 @@ static int sg_open(struct inode *inode, struct file *filp) { bool o_excl, non_block; + int res; int min_dev = iminor(inode); int op_flags = filp->f_flags; struct sg_device *sdp; struct sg_fd *sfp; - int res; nonseekable_open(inode, filp); o_excl = !!(op_flags & O_EXCL); @@ -508,7 +510,6 @@ sg_open(struct inode *inode, struct file *filp) filp->private_data = sfp; sfp->tid = (current ? current->pid : -1); - sfp->tid = (current ? current->pid : -1); atomic_inc(&sdp->open_cnt); mutex_unlock(&sdp->open_rel_lock); @@ -842,7 +843,10 @@ sg_execute_cmd(struct sg_fd *sfp, struct sg_request *srp) is_v4h = test_bit(SG_FRQ_IS_V4I, srp->frq_bm); sync = test_bit(SG_FRQ_SYNC_INVOC, srp->frq_bm); SG_LOG(3, sdp, "%s: is_v4h=%d\n", __func__, (int)is_v4h); - srp->start_ns = ktime_get_boot_ns(); + if (test_bit(SG_FFD_NO_DURATION, sfp->ffd_bm)) + srp->start_ns = 0; + else + srp->start_ns = ktime_get_boot_ns(); /* assume always > 0 */ srp->duration = 0; if (!is_v4h && srp->s_hdr3.interface_id == '\0') @@ -1473,29 +1477,42 @@ sg_calc_sgat_param(struct sg_device *sdp) sdp->max_sgat_sz = sz; } +/* + * Returns duration since srp->start_ns (using boot time as an epoch). Unit + * is nanoseconds when time_in_ns==true; else it is in milliseconds. + * For backward compatibility the duration is placed in a 32 bit unsigned + * integer. This limits the maximum nanosecond duration that can be + * represented (without wrapping) to about 4.3 seconds. If that is exceeded + * return equivalent of 3.999.. secs as it is more eye catching than the real + * number. Negative durations should not be possible but if they occur set + * duration to an unlikely 2 nanosec. Stalls in a request setup will have + * ts0==U64_MAX and will return 1 for an unlikely 1 nanosecond duration. + */ static u32 -sg_calc_rq_dur(const struct sg_request *srp) +sg_calc_rq_dur(const struct sg_request *srp, bool time_in_ns) { ktime_t ts0 = srp->start_ns; ktime_t now_ts; s64 diff; - if (ts0 == 0) + if (ts0 == 0) /* only when SG_FFD_NO_DURATION is set */ return 0; if (unlikely(ts0 == U64_MAX)) /* _prior_ to issuing req */ - return 999999999; /* eye catching */ + return time_in_ns ? 1 : 999999999; now_ts = ktime_get_boot_ns(); if (unlikely(ts0 > now_ts)) - return 999999998; - /* unlikely req duration will exceed 2**32 milliseconds */ - diff = ktime_ms_delta(now_ts, ts0); + return time_in_ns ? 2 : 999999998; + if (time_in_ns) + diff = ktime_to_ns(ktime_sub(now_ts, ts0)); + else /* unlikely req duration will exceed 2**32 milliseconds */ + diff = ktime_ms_delta(now_ts, ts0); return (diff > (s64)U32_MAX) ? 3999999999U : (u32)diff; } /* Return of U32_MAX means srp is inactive or in slave waiting state */ static u32 sg_get_dur(struct sg_request *srp, const enum sg_rq_state *sr_stp, - bool *is_durp) + bool time_in_ns, bool *is_durp) { bool is_dur = false; u32 res = U32_MAX; @@ -1503,7 +1520,7 @@ sg_get_dur(struct sg_request *srp, const enum sg_rq_state *sr_stp, switch (sr_stp ? *sr_stp : atomic_read(&srp->rq_st)) { case SG_RS_INFLIGHT: case SG_RS_BUSY: - res = sg_calc_rq_dur(srp); + res = sg_calc_rq_dur(srp, time_in_ns); break; case SG_RS_AWAIT_RD: case SG_RS_DONE_RD: @@ -1525,7 +1542,8 @@ sg_fill_request_element(struct sg_fd *sfp, struct sg_request *srp, __must_hold(&sfp->rq_list_lock) { spin_lock(&srp->req_lck); - rip->duration = sg_get_dur(srp, NULL, NULL); + rip->duration = sg_get_dur(srp, NULL, test_bit(SG_FFD_TIME_IN_NS, + sfp->ffd_bm), NULL); if (rip->duration == U32_MAX) rip->duration = 0; rip->orphan = test_bit(SG_FRQ_IS_ORPHAN, srp->frq_bm); @@ -1802,6 +1820,177 @@ sg_set_reserved_sz(struct sg_fd *sfp, int want_rsv_sz) return res; } +/* + * Processing of ioctl(SG_SET_GET_EXTENDED(SG_SEIM_CTL_FLAGS)) which is a set + * of boolean flags. Access abbreviations: [rw], read-write; [ro], read-only; + * [wo], write-only; [raw], read after write; [rbw], read before write. + */ +static void +sg_extended_bool_flags(struct sg_fd *sfp, struct sg_extended_info *seip) +{ + bool flg = false; + u32 c_flgs_wm = seip->ctl_flags_wr_mask; + u32 c_flgs_rm = seip->ctl_flags_rd_mask; + u32 *c_flgsp = &seip->ctl_flags; + struct sg_device *sdp = sfp->parentdp; + + /* TIME_IN_NS boolean, [raw] time in nanoseconds (def: millisecs) */ + if (c_flgs_wm & SG_CTL_FLAGM_TIME_IN_NS) + assign_bit(SG_FFD_TIME_IN_NS, sfp->ffd_bm, + !!(*c_flgsp & SG_CTL_FLAGM_TIME_IN_NS)); + if (c_flgs_rm & SG_CTL_FLAGM_TIME_IN_NS) { + if (test_bit(SG_FFD_TIME_IN_NS, sfp->ffd_bm)) + *c_flgsp |= SG_CTL_FLAGM_TIME_IN_NS; + else + *c_flgsp &= ~SG_CTL_FLAGM_TIME_IN_NS; + } + /* OTHER_OPENS boolean, [ro] any other sg open fds on this dev? */ + if (c_flgs_rm & SG_CTL_FLAGM_OTHER_OPENS) { + if (atomic_read(&sdp->open_cnt) > 1) + *c_flgsp |= SG_CTL_FLAGM_OTHER_OPENS; + else + *c_flgsp &= ~SG_CTL_FLAGM_OTHER_OPENS; + } + /* Q_TAIL boolean, [raw] 1: queue at tail; 0: head (def: depends) */ + if (c_flgs_wm & SG_CTL_FLAGM_Q_TAIL) + assign_bit(SG_FFD_Q_AT_TAIL, sfp->ffd_bm, + !!(*c_flgsp & SG_CTL_FLAGM_Q_TAIL)); + if (c_flgs_rm & SG_CTL_FLAGM_Q_TAIL) { + if (test_bit(SG_FFD_Q_AT_TAIL, sfp->ffd_bm)) + *c_flgsp |= SG_CTL_FLAGM_Q_TAIL; + else + *c_flgsp &= ~SG_CTL_FLAGM_Q_TAIL; + } + /* NO_DURATION boolean, [rbw] */ + if (c_flgs_rm & SG_CTL_FLAGM_NO_DURATION) + flg = test_bit(SG_FFD_NO_DURATION, sfp->ffd_bm); + if (c_flgs_wm & SG_CTL_FLAGM_NO_DURATION) + assign_bit(SG_FFD_NO_DURATION, sfp->ffd_bm, + !!(*c_flgsp & SG_CTL_FLAGM_NO_DURATION)); + if (c_flgs_rm & SG_CTL_FLAGM_NO_DURATION) { + if (flg) + *c_flgsp |= SG_CTL_FLAGM_NO_DURATION; + else + *c_flgsp &= ~SG_CTL_FLAGM_NO_DURATION; + } +} + +static void +sg_extended_read_value(struct sg_fd *sfp, struct sg_extended_info *seip) +{ + u32 uv; + unsigned long iflags; + struct sg_fd *a_sfp; + struct sg_device *sdp = sfp->parentdp; + struct sg_request *srp; + + switch (seip->read_value) { + case SG_SEIRV_INT_MASK: + seip->read_value = SG_SEIM_ALL_BITS; + break; + case SG_SEIRV_BOOL_MASK: + seip->read_value = SG_CTL_FLAGM_ALL_BITS; + break; + case SG_SEIRV_VERS_NUM: + seip->read_value = sg_version_num; + break; + case SG_SEIRV_FL_RQS: + uv = 0; + rcu_read_lock(); + list_for_each_entry_rcu(srp, &sfp->rq_fl, fl_entry) + ++uv; + rcu_read_unlock(); + seip->read_value = uv; + break; + case SG_SEIRV_DEV_FL_RQS: + uv = 0; + read_lock_irqsave(&sdp->sfd_llock, iflags); + list_for_each_entry(a_sfp, &sdp->sfds, sfd_entry) { + rcu_read_lock(); + list_for_each_entry_rcu(srp, &a_sfp->rq_fl, fl_entry) + ++uv; + rcu_read_unlock(); + } + read_unlock_irqrestore(&sdp->sfd_llock, iflags); + seip->read_value = uv; + break; + case SG_SEIRV_SUBMITTED: /* counts all non-blocking on active list */ + seip->read_value = (u32)atomic_read(&sfp->submitted); + break; + case SG_SEIRV_DEV_SUBMITTED: /* sum(submitted) on all fd's siblings */ + uv = 0; + read_lock_irqsave(&sdp->sfd_llock, iflags); + list_for_each_entry(a_sfp, &sdp->sfds, sfd_entry) + uv += (u32)atomic_read(&a_sfp->submitted); + read_unlock_irqrestore(&sdp->sfd_llock, iflags); + seip->read_value = uv; + break; + default: + SG_LOG(6, sdp, "%s: can't decode %d --> read_value\n", + __func__, seip->read_value); + seip->read_value = 0; + break; + } +} + +/* Called when processing ioctl(SG_SET_GET_EXTENDED) */ +static int +sg_ctl_extended(struct sg_fd *sfp, void __user *p) +{ + int result = 0; + int ret = 0; + int s_wr_mask, s_rd_mask; + u32 or_masks; + struct sg_device *sdp = sfp->parentdp; + struct sg_extended_info *seip; + struct sg_extended_info sei; + + seip = &sei; + if (copy_from_user(seip, p, SZ_SG_EXTENDED_INFO)) + return -EFAULT; + s_wr_mask = seip->sei_wr_mask; + s_rd_mask = seip->sei_rd_mask; + or_masks = s_wr_mask | s_rd_mask; + if (or_masks == 0) { + SG_LOG(2, sdp, "%s: both masks 0, do nothing\n", __func__); + return 0; + } + SG_LOG(3, sdp, "%s: wr_mask=0x%x rd_mask=0x%x\n", __func__, s_wr_mask, + s_rd_mask); + /* check all boolean flags for either wr or rd mask set in or_mask */ + if (or_masks & SG_SEIM_CTL_FLAGS) + sg_extended_bool_flags(sfp, seip); + /* yields minor_index (type: u32) [ro] */ + if (or_masks & SG_SEIM_MINOR_INDEX) { + if (s_wr_mask & SG_SEIM_MINOR_INDEX) { + SG_LOG(2, sdp, "%s: writing to minor_index ignored\n", + __func__); + } + if (s_rd_mask & SG_SEIM_MINOR_INDEX) + seip->minor_index = sdp->index; + } + if ((s_rd_mask & SG_SEIM_READ_VAL) && (s_wr_mask & SG_SEIM_READ_VAL)) + sg_extended_read_value(sfp, seip); + /* reserved_sz [raw], since may be reduced by other limits */ + if (s_wr_mask & SG_SEIM_RESERVED_SIZE) { + mutex_lock(&sfp->f_mutex); + result = sg_set_reserved_sz(sfp, (int)seip->reserved_sz); + if (ret == 0 && result) + ret = result; + mutex_unlock(&sfp->f_mutex); + } + if (s_rd_mask & SG_SEIM_RESERVED_SIZE) + seip->reserved_sz = (u32)min_t(int, + sfp->rsv_srp->sgat_h.buflen, + sdp->max_sgat_sz); + /* copy to user space if int or boolean read mask non-zero */ + if (s_rd_mask || seip->ctl_flags_rd_mask) { + if (copy_to_user(p, seip, SZ_SG_EXTENDED_INFO)) + ret = ret ? ret : -EFAULT; + } + return ret; +} + /* * For backward compatibility, output SG_MAX_QUEUE sg_req_info objects. First * fetch from the active list then, if there is still room, from the free @@ -1928,6 +2117,9 @@ sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) res = sg_ctl_abort(sdp, sfp, p); mutex_unlock(&sfp->f_mutex); return res; + case SG_SET_GET_EXTENDED: + SG_LOG(3, sdp, "%s: SG_SET_GET_EXTENDED\n", __func__); + return sg_ctl_extended(sfp, p); case SG_GET_SCSI_ID: return sg_ctl_scsi_id(sdev, sdp, p); case SG_SET_FORCE_PACK_ID: @@ -2452,7 +2644,9 @@ sg_rq_end_io(struct request *rq, blk_status_t status) SG_LOG(6, sdp, "%s: pack_id=%d, res=0x%x\n", __func__, srp->pack_id, srp->rq_result); - srp->duration = sg_calc_rq_dur(srp); + if (srp->start_ns > 0) /* zero only when SG_FFD_NO_DURATION is set */ + srp->duration = sg_calc_rq_dur(srp, test_bit(SG_FFD_TIME_IN_NS, + sfp->ffd_bm)); if (unlikely((srp->rq_result & SG_ML_RESULT_MSK) && slen > 0)) sg_check_sense(sdp, srp, slen); if (slen > 0) { @@ -3441,6 +3635,9 @@ sg_add_request(struct sg_comm_wr_t *cwrp, int dxfr_len) r_srp->frq_bm[0] = cwrp->frq_bm[0]; /* assumes <= 32 req flags */ r_srp->sgat_h.dlen = dxfr_len;/* must be <= r_srp->sgat_h.buflen */ r_srp->cmd_opcode = 0xff; /* set invalid opcode (VS), 0x0 is TUR */ + /* If setup stalls (e.g. blk_get_request()) debug shows 'elap=1 ns' */ + if (test_bit(SG_FFD_TIME_IN_NS, fp->ffd_bm)) + r_srp->start_ns = U64_MAX; if (mk_new_srp) spin_lock_irqsave(&fp->rq_list_lock, iflags); list_add_tail_rcu(&r_srp->rq_entry, &fp->rq_list); @@ -3543,6 +3740,7 @@ sg_add_sfp(struct sg_device *sdp) assign_bit(SG_FFD_FORCE_PACKID, sfp->ffd_bm, SG_DEF_FORCE_PACK_ID); assign_bit(SG_FFD_CMD_Q, sfp->ffd_bm, SG_DEF_COMMAND_Q); assign_bit(SG_FFD_KEEP_ORPHAN, sfp->ffd_bm, SG_DEF_KEEP_ORPHAN); + assign_bit(SG_FFD_TIME_IN_NS, sfp->ffd_bm, SG_DEF_TIME_UNIT); assign_bit(SG_FFD_Q_AT_TAIL, sfp->ffd_bm, SG_DEFAULT_Q_AT); atomic_set(&sfp->submitted, 0); atomic_set(&sfp->waiting, 0); @@ -3979,7 +4177,8 @@ sg_proc_seq_show_devstrs(struct seq_file *s, void *v) /* Writes debug info for one sg_request in obp buffer */ static int -sg_proc_dbg_sreq(struct sg_request *srp, int to, char *obp, int len) +sg_proc_dbg_sreq(struct sg_request *srp, int to, bool t_in_ns, char *obp, + int len) __must_hold(&srp->req_lck) { bool is_v3v4, v4, is_dur; @@ -3987,6 +4186,7 @@ sg_proc_dbg_sreq(struct sg_request *srp, int to, char *obp, int len) u32 dur; enum sg_rq_state rq_st; const char *cp; + const char *tp = t_in_ns ? "ns" : "ms"; if (len < 1) return 0; @@ -3999,15 +4199,15 @@ sg_proc_dbg_sreq(struct sg_request *srp, int to, char *obp, int len) cp = (srp->rq_info & SG_INFO_DIRECT_IO_MASK) ? " dio>> " : " "; rq_st = atomic_read(&srp->rq_st); - dur = sg_get_dur(srp, &rq_st, &is_dur); + dur = sg_get_dur(srp, &rq_st, t_in_ns, &is_dur); n += scnprintf(obp + n, len - n, "%s%s: dlen=%d/%d id=%d", cp, sg_rq_st_str(rq_st, false), srp->sgat_h.dlen, srp->sgat_h.buflen, (int)srp->pack_id); if (is_dur) /* cmd/req has completed, waiting for ... */ - n += scnprintf(obp + n, len - n, " dur=%ums", dur); + n += scnprintf(obp + n, len - n, " dur=%u%s", dur, tp); else if (dur < U32_MAX) /* in-flight or busy (so ongoing) */ - n += scnprintf(obp + n, len - n, " t_o/elap=%us/%ums", - to / 1000, dur); + n += scnprintf(obp + n, len - n, " t_o/elap=%us/%u%s", + to / 1000, dur, tp); n += scnprintf(obp + n, len - n, " sgat=%d op=0x%02x\n", srp->sgat_h.num_sgat, srp->cmd_opcode); return n; @@ -4045,7 +4245,9 @@ sg_proc_dbg_fd(struct sg_fd *fp, char *obp, int len) atomic_read(&fp->waiting), fp->tid); list_for_each_entry_rcu(srp, &fp->rq_list, rq_entry) { spin_lock(&srp->req_lck); - n += sg_proc_dbg_sreq(srp, fp->timeout, obp + n, len - n); + n += sg_proc_dbg_sreq(srp, fp->timeout, + test_bit(SG_FFD_TIME_IN_NS, fp->ffd_bm), + obp + n, len - n); spin_unlock(&srp->req_lck); } if (list_empty(&fp->rq_list)) @@ -4057,7 +4259,9 @@ sg_proc_dbg_fd(struct sg_fd *fp, char *obp, int len) first_fl = false; } spin_lock(&srp->req_lck); - n += sg_proc_dbg_sreq(srp, fp->timeout, obp + n, len - n); + n += sg_proc_dbg_sreq(srp, fp->timeout, + test_bit(SG_FFD_TIME_IN_NS, fp->ffd_bm), + obp + n, len - n); spin_unlock(&srp->req_lck); } return n; diff --git a/include/uapi/scsi/sg.h b/include/uapi/scsi/sg.h index 8181e36442a8..ca2b4819ddcd 100644 --- a/include/uapi/scsi/sg.h +++ b/include/uapi/scsi/sg.h @@ -154,6 +154,70 @@ typedef struct sg_req_info { /* used by SG_GET_REQUEST_TABLE ioctl() */ int unused; } sg_req_info_t; +/* + * The following defines are for manipulating struct sg_extended_info which + * is abbreviated to "SEI". A following "M" (i.e. "_SEIM_") indicates a + * mask. Most mask values correspond to a integer (usually a uint32_t) apart + * from SG_SEIM_CTL_FLAGS which is for boolean values packed into an integer. + * The mask values for those booleans start with "SG_CTL_FLAGM_". The scope + * of these settings, like most other ioctls, is usually that of the file + * descriptor the ioctl is executed on. The "rd:" indication means read-only, + * attempts to write to them are ignored. "rd>" means action when reading. + */ +#define SG_SEIM_CTL_FLAGS 0x1 /* ctl_flags_mask bits in ctl_flags */ +#define SG_SEIM_READ_VAL 0x2 /* write SG_SEIRV_*, read back value */ +#define SG_SEIM_RESERVED_SIZE 0x4 /* reserved_sz of reserve request */ +#define SG_SEIM_MINOR_INDEX 0x10 /* sg device minor index number */ +#define SG_SEIM_SGAT_ELEM_SZ 0x80 /* sgat element size (>= PAGE_SIZE) */ +#define SG_SEIM_ALL_BITS 0xff /* should be OR of previous items */ + +/* flag and mask values for boolean fields follow */ +#define SG_CTL_FLAGM_TIME_IN_NS 0x1 /* time: nanosecs (def: millisecs) */ +#define SG_CTL_FLAGM_OTHER_OPENS 0x4 /* rd: other sg fd_s on this dev */ +#define SG_CTL_FLAGM_ORPHANS 0x8 /* rd: orphaned requests on this fd */ +#define SG_CTL_FLAGM_Q_TAIL 0x10 /* used for future cmds on this fd */ +#define SG_CTL_FLAGM_NO_DURATION 0x400 /* don't calc command duration */ +#define SG_CTL_FLAGM_ALL_BITS 0xfff /* should be OR of previous items */ + +/* Write one of the following values to sg_extended_info::read_value, get... */ +#define SG_SEIRV_INT_MASK 0x0 /* get SG_SEIM_ALL_BITS */ +#define SG_SEIRV_BOOL_MASK 0x1 /* get SG_CTL_FLAGM_ALL_BITS */ +#define SG_SEIRV_VERS_NUM 0x2 /* get driver version number as int */ +#define SG_SEIRV_FL_RQS 0x3 /* number of requests in free list */ +#define SG_SEIRV_DEV_FL_RQS 0x4 /* sum(fl rqs) on all dev's fds */ +#define SG_SEIRV_SUBMITTED 0x5 /* number of mrqs submitted+unread */ +#define SG_SEIRV_DEV_SUBMITTED 0x6 /* sum(submitted) on all dev's fds */ + +/* + * A pointer to the following structure is passed as the third argument to + * ioctl(SG_SET_GET_EXTENDED). Each bit in the *_wr_mask fields causes the + * corresponding integer (e.g. reserved_sz) or bit (e.g. the + * SG_CTL_FLAG_TIME_IN_NS bit in ctl_flags) to be read from the user space + * and modify the driver. Each bit in the *_rd_mask fields causes the + * corresponding integer or bit to be fetched from the driver and written + * back to the user space. If the same bit is set in both the *_wr_mask and + * corresponding *_rd_mask fields, then which one comes first depends on the + * setting but no other operation will split the two. This structure is + * padded to 96 bytes to allow for new values to be added in the future. + */ + +/* If both sei_wr_mask and sei_rd_mask are 0, this ioctl does nothing */ +struct sg_extended_info { + __u32 sei_wr_mask; /* OR-ed SG_SEIM_* user->driver values */ + __u32 sei_rd_mask; /* OR-ed SG_SEIM_* driver->user values */ + __u32 ctl_flags_wr_mask; /* OR-ed SG_CTL_FLAGM_* values */ + __u32 ctl_flags_rd_mask; /* OR-ed SG_CTL_FLAGM_* values */ + __u32 ctl_flags; /* bit values OR-ed, see SG_CTL_FLAGM_* */ + __u32 read_value; /* write SG_SEIRV_*, read back related */ + + __u32 reserved_sz; /* data/sgl size of pre-allocated request */ + __u32 tot_fd_thresh; /* total data/sgat for this fd, 0: no limit */ + __u32 minor_index; /* rd: kernel's sg device minor number */ + __u32 share_fd; /* SHARE_FD and CHG_SHARE_FD use this */ + __u32 sgat_elem_sz; /* sgat element size (must be power of 2) */ + __u8 pad_to_96[52]; /* pad so struct is 96 bytes long */ +}; + /* * IOCTLs: Those ioctls that are relevant to the SG 3.x drivers follow. * [Those that only apply to the SG 2.x drivers are at the end of the file.] @@ -183,6 +247,9 @@ typedef struct sg_req_info { /* used by SG_GET_REQUEST_TABLE ioctl() */ */ #define SG_IOCTL_MAGIC_NUM 0x22 +#define SG_SET_GET_EXTENDED _IOWR(SG_IOCTL_MAGIC_NUM, 0x51, \ + struct sg_extended_info) + /* The following ioctl has a 'sg_scsi_id_t *' object as its 3rd argument. */ #define SG_GET_SCSI_ID 0x2276 /* Yields fd's bus, chan, dev, lun + type */ /* SCSI id information can also be obtained from SCSI_IOCTL_GET_IDLUN */ -- 2.17.1
