3cc092ff06
now used for printing diagnostic messages through the kernel message buffer. this lets processes print diagnostics without sending messages to tty and log directly, simplifying the message protocol a lot and reducing difficulties with deadlocks and other situations in which diagnostics are blackholed (e.g. grants don't work). this makes DIAGNOSTICS(_S), ASYN_DIAGNOSTICS and DIAG_REPL obsolete, although tty and log still accept the codes for 'old' binaries. This also simplifies diagnostics in several servers and drivers - only tty needs its own kputc() now. . simplifications in vfs, and some effort to get the vnode references right (consistent) even during shutdown. m_mounted_on is now NULL for root filesystems (!) (the original and new root), a less awkward special case than 'm_mounted_on == m_root_node'. root now has exactly one reference, to root, if no files are open, just like all other filesystems. m_driver_e is unused.
621 lines
18 KiB
C
621 lines
18 KiB
C
/* This file contains device independent device driver interface.
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*
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* Changes:
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* Jul 25, 2005 added SYS_SIG type for signals (Jorrit N. Herder)
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* Sep 15, 2004 added SYN_ALARM type for timeouts (Jorrit N. Herder)
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* Jul 23, 2004 removed kernel dependencies (Jorrit N. Herder)
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* Apr 02, 1992 constructed from AT wini and floppy driver (Kees J. Bot)
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*
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*
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* The drivers support the following operations (using message format m2):
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*
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* m_type DEVICE IO_ENDPT COUNT POSITION ADRRESS
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* ----------------------------------------------------------------
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* | DEV_OPEN | device | proc nr | | | |
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* |------------+---------+---------+---------+---------+---------|
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* | DEV_CLOSE | device | proc nr | | | |
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* |------------+---------+---------+---------+---------+---------|
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* | DEV_READ | device | proc nr | bytes | offset | buf ptr |
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* |------------+---------+---------+---------+---------+---------|
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* | DEV_WRITE | device | proc nr | bytes | offset | buf ptr |
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* |------------+---------+---------+---------+---------+---------|
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* | DEV_GATHER | device | proc nr | iov len | offset | iov ptr |
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* |------------+---------+---------+---------+---------+---------|
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* | DEV_SCATTER| device | proc nr | iov len | offset | iov ptr |
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* |------------+---------+---------+---------+---------+---------|
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* | DEV_IOCTL | device | proc nr |func code| | buf ptr |
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* |------------+---------+---------+---------+---------+---------|
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* | CANCEL | device | proc nr | r/w | | |
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* |------------+---------+---------+---------+---------+---------|
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* | HARD_STOP | | | | | |
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* |------------+---------+---------+---------+---------+---------|
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* | DEV_*_S | variants using safecopies of above |
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* ----------------------------------------------------------------
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*
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* The file contains one entry point:
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*
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* driver_task: called by the device dependent task entry
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*/
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#include "../drivers.h"
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#include <sys/ioc_disk.h>
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#include <minix/mq.h>
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#include "driver.h"
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/* Claim space for variables. */
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u8_t *tmp_buf = NULL; /* the DMA buffer eventually */
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phys_bytes tmp_phys; /* phys address of DMA buffer */
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FORWARD _PROTOTYPE( void init_buffer, (void) );
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FORWARD _PROTOTYPE( int do_rdwt, (struct driver *dr, message *mp, int safe) );
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FORWARD _PROTOTYPE( int do_vrdwt, (struct driver *dr, message *mp, int safe) );
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_PROTOTYPE( int asynsend, (endpoint_t dst, message *mp));
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int device_caller;
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PRIVATE mq_t *queue_head = NULL;
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/*===========================================================================*
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* driver_task *
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*===========================================================================*/
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PUBLIC void driver_task(dp)
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struct driver *dp; /* Device dependent entry points. */
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{
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/* Main program of any device driver task. */
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int r, proc_nr;
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message mess, reply_mess;
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/* Init MQ library. */
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mq_init();
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/* Here is the main loop of the disk task. It waits for a message, carries
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* it out, and sends a reply.
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*/
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while (TRUE) {
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/* Any queued messages? Oldest are at the head. */
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if(queue_head) {
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mq_t *mq;
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mq = queue_head;
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memcpy(&mess, &mq->mq_mess, sizeof(mess));
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queue_head = queue_head->mq_next;
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mq_free(mq);
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} else {
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int s;
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/* Wait for a request to read or write a disk block. */
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if ((s=receive(ANY, &mess)) != OK)
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panic((*dp->dr_name)(),"receive() failed", s);
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}
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device_caller = mess.m_source;
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proc_nr = mess.IO_ENDPT;
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#if 0
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if (mess.m_type != SYN_ALARM && mess.m_type != DEV_PING &&
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mess.m_type != 4105 /* notify from TTY */ &&
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mess.m_type != DEV_SELECT &&
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mess.m_type != DEV_READ_S &&
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mess.m_type != DIAGNOSTICS_S &&
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mess.m_type != CANCEL)
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{
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printf("libdriver_asyn`driver_task: msg %d / 0x%x from %d\n",
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mess.m_type, mess.m_type, mess.m_source);
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}
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#endif
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if (mess.m_type == DEV_SELECT)
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{
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static int first= 1;
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if (first)
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{
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first= 0;
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#if 0
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printf(
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"libdriver_asyn`driver_task: first DEV_SELECT: minor 0x%x, ops 0x%x\n",
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mess.DEVICE, mess.IO_ENDPT);
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#endif
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}
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}
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/* Now carry out the work. */
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switch(mess.m_type) {
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case DEV_OPEN: r = (*dp->dr_open)(dp, &mess); break;
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case DEV_CLOSE: r = (*dp->dr_close)(dp, &mess); break;
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#ifdef DEV_IOCTL
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case DEV_IOCTL: r = (*dp->dr_ioctl)(dp, &mess, 0); break;
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#endif
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case DEV_IOCTL_S: r = (*dp->dr_ioctl)(dp, &mess, 1); break;
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case CANCEL: r = (*dp->dr_cancel)(dp, &mess);break;
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case DEV_SELECT: r = (*dp->dr_select)(dp, &mess);break;
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#ifdef DEV_READ
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case DEV_READ:
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case DEV_WRITE: r = do_rdwt(dp, &mess, 0); break;
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#endif
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case DEV_READ_S:
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case DEV_WRITE_S: r = do_rdwt(dp, &mess, 1); break;
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#ifdef DEV_GATHER
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case DEV_GATHER:
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case DEV_SCATTER: r = do_vrdwt(dp, &mess, 0); break;
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#endif
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case DEV_GATHER_S:
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case DEV_SCATTER_S: r = do_vrdwt(dp, &mess, 1); break;
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case HARD_INT: /* leftover interrupt or expired timer. */
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if(dp->dr_hw_int) {
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(*dp->dr_hw_int)(dp, &mess);
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}
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continue;
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case PROC_EVENT:
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case SYS_SIG: (*dp->dr_signal)(dp, &mess);
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continue; /* don't reply */
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case SYN_ALARM: (*dp->dr_alarm)(dp, &mess);
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continue; /* don't reply */
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case DEV_PING: notify(mess.m_source);
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continue;
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default:
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if(dp->dr_other)
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r = (*dp->dr_other)(dp, &mess, 0);
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else
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r = EINVAL;
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break;
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}
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/* Clean up leftover state. */
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(*dp->dr_cleanup)();
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/* Finally, prepare and send the reply message. */
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if (r != EDONTREPLY) {
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if (mess.m_type == DEV_OPEN)
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{
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reply_mess.m_type = DEV_REVIVE;
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reply_mess.REP_ENDPT = proc_nr;
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reply_mess.REP_STATUS = r;
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}
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else if (mess.m_type == DEV_CLOSE)
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{
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reply_mess.m_type = DEV_CLOSE_REPL;
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reply_mess.REP_ENDPT = proc_nr;
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reply_mess.REP_STATUS = r;
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}
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else if (mess.m_type == DEV_READ_S ||
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mess.m_type == DEV_WRITE_S)
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{
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if (r == SUSPEND)
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{
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printf(
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"driver_task: reviving %d with SUSPEND\n",
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proc_nr);
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}
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reply_mess.m_type = DEV_REVIVE;
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reply_mess.REP_ENDPT = proc_nr;
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reply_mess.REP_IO_GRANT = (cp_grant_id_t)mess.ADDRESS;
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reply_mess.REP_STATUS = r;
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}
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else if (mess.m_type == CANCEL)
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{
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continue; /* The original request should send a
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* reply.
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*/
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}
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else if (mess.m_type == DEV_SELECT)
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{
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reply_mess.m_type = DEV_SEL_REPL1;
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reply_mess.DEV_MINOR = mess.DEVICE;
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reply_mess.DEV_SEL_OPS = r;
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}
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else
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{
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#if 0
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printf("driver_task: TASK_REPLY to req %d\n",
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mess.m_type);
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#endif
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reply_mess.m_type = TASK_REPLY;
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reply_mess.REP_ENDPT = proc_nr;
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/* Status is # of bytes transferred or error code. */
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reply_mess.REP_STATUS = r;
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}
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r= asynsend(device_caller, &reply_mess);
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if (r != OK)
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{
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printf("driver_task: unable to asynsend to %d: %d\n",
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device_caller, r);
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}
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}
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}
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}
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/*===========================================================================*
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* init_buffer *
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*===========================================================================*/
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PRIVATE void init_buffer()
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{
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/* Select a buffer that can safely be used for DMA transfers. It may also
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* be used to read partition tables and such. Its absolute address is
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* 'tmp_phys', the normal address is 'tmp_buf'.
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*/
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unsigned left;
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if(!(tmp_buf = alloc_contig(2*DMA_BUF_SIZE, 0, &tmp_phys))) {
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panic(__FILE__, "can't allocate tmp_buf", NO_NUM);
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}
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}
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/*===========================================================================*
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* do_rdwt *
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*===========================================================================*/
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PRIVATE int do_rdwt(dp, mp, safe)
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struct driver *dp; /* device dependent entry points */
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message *mp; /* pointer to read or write message */
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int safe; /* use safecopies? */
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{
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/* Carry out a single read or write request. */
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iovec_t iovec1;
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int r, opcode;
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phys_bytes phys_addr;
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u64_t position;
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/* Disk address? Address and length of the user buffer? */
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if (mp->COUNT < 0) return(EINVAL);
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/* Check the user buffer (not relevant for safe copies). */
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if(!safe) {
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sys_umap(mp->IO_ENDPT, D, (vir_bytes) mp->ADDRESS, mp->COUNT, &phys_addr);
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if (phys_addr == 0) return(EFAULT);
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}
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/* Prepare for I/O. */
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if ((*dp->dr_prepare)(mp->DEVICE) == NIL_DEV) return(ENXIO);
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/* Create a one element scatter/gather vector for the buffer. */
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if(
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#ifdef DEV_READ
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mp->m_type == DEV_READ ||
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#endif
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mp->m_type == DEV_READ_S) opcode = DEV_GATHER_S;
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else opcode = DEV_SCATTER_S;
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iovec1.iov_addr = (vir_bytes) mp->ADDRESS;
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iovec1.iov_size = mp->COUNT;
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/* Transfer bytes from/to the device. */
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position= make64(mp->POSITION, mp->HIGHPOS);
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r = (*dp->dr_transfer)(mp->IO_ENDPT, opcode, position, &iovec1, 1, safe);
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/* Return the number of bytes transferred or an error code. */
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return(r == OK ? (mp->COUNT - iovec1.iov_size) : r);
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}
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/*==========================================================================*
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* do_vrdwt *
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*==========================================================================*/
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PRIVATE int do_vrdwt(dp, mp, safe)
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struct driver *dp; /* device dependent entry points */
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message *mp; /* pointer to read or write message */
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int safe; /* use safecopies? */
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{
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/* Carry out an device read or write to/from a vector of user addresses.
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* The "user addresses" are assumed to be safe, i.e. FS transferring to/from
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* its own buffers, so they are not checked.
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*/
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static iovec_t iovec[NR_IOREQS];
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iovec_t *iov;
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phys_bytes iovec_size;
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unsigned nr_req;
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int r, j, opcode;
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u64_t position;
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nr_req = mp->COUNT; /* Length of I/O vector */
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{
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/* Copy the vector from the caller to kernel space. */
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if (nr_req > NR_IOREQS) nr_req = NR_IOREQS;
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iovec_size = (phys_bytes) (nr_req * sizeof(iovec[0]));
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if(safe) {
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if (OK != sys_safecopyfrom(mp->m_source, (vir_bytes) mp->IO_GRANT,
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0, (vir_bytes) iovec, iovec_size, D)) {
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panic((*dp->dr_name)(),"bad (safe) I/O vector by", mp->m_source);
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}
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} else {
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if (OK != sys_datacopy(mp->m_source, (vir_bytes) mp->ADDRESS,
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SELF, (vir_bytes) iovec, iovec_size)) {
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panic((*dp->dr_name)(),"bad I/O vector by", mp->m_source);
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}
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}
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iov = iovec;
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}
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|
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/* Prepare for I/O. */
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if ((*dp->dr_prepare)(mp->DEVICE) == NIL_DEV) return(ENXIO);
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|
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/* Transfer bytes from/to the device. */
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opcode = mp->m_type;
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position= make64(mp->POSITION, mp->HIGHPOS);
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r = (*dp->dr_transfer)(mp->IO_ENDPT, opcode, position, iov,
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nr_req, safe);
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/* Copy the I/O vector back to the caller. */
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if(safe) {
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if (OK != sys_safecopyto(mp->m_source, (vir_bytes) mp->IO_GRANT,
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0, (vir_bytes) iovec, iovec_size, D)) {
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panic((*dp->dr_name)(),"couldn't return I/O vector", mp->m_source);
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}
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} else {
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sys_datacopy(SELF, (vir_bytes) iovec,
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mp->m_source, (vir_bytes) mp->ADDRESS, iovec_size);
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}
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return(r);
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}
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|
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/*===========================================================================*
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* no_name *
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*===========================================================================*/
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PUBLIC char *no_name()
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{
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/* Use this default name if there is no specific name for the device. This was
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* originally done by fetching the name from the task table for this process:
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* "return(tasktab[proc_number(proc_ptr) + NR_TASKS].name);", but currently a
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* real "noname" is returned. Perhaps, some system information service can be
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* queried for a name at a later time.
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*/
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static char name[] = "noname";
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return name;
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}
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|
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/*============================================================================*
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* do_nop *
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*============================================================================*/
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PUBLIC int do_nop(dp, mp)
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struct driver *dp;
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message *mp;
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{
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/* Nothing there, or nothing to do. */
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|
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switch (mp->m_type) {
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case DEV_OPEN: return(ENODEV);
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case DEV_CLOSE: return(OK);
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case DEV_IOCTL_S:
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#ifdef DEV_IOCTL
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case DEV_IOCTL: return(ENOTTY);
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#endif
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default: printf("nop: ignoring code %d\n", mp->m_type); return(EIO);
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}
|
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}
|
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|
|
/*============================================================================*
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* nop_ioctl *
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*============================================================================*/
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PUBLIC int nop_ioctl(dp, mp, safe)
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struct driver *dp;
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message *mp;
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int safe;
|
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{
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|
return(ENOTTY);
|
|
}
|
|
|
|
/*============================================================================*
|
|
* nop_signal *
|
|
*============================================================================*/
|
|
PUBLIC void nop_signal(dp, mp)
|
|
struct driver *dp;
|
|
message *mp;
|
|
{
|
|
/* Default action for signal is to ignore. */
|
|
}
|
|
|
|
/*============================================================================*
|
|
* nop_alarm *
|
|
*============================================================================*/
|
|
PUBLIC void nop_alarm(dp, mp)
|
|
struct driver *dp;
|
|
message *mp;
|
|
{
|
|
/* Ignore the leftover alarm. */
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* nop_prepare *
|
|
*===========================================================================*/
|
|
PUBLIC struct device *nop_prepare(device)
|
|
{
|
|
/* Nothing to prepare for. */
|
|
return(NIL_DEV);
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* nop_cleanup *
|
|
*===========================================================================*/
|
|
PUBLIC void nop_cleanup()
|
|
{
|
|
/* Nothing to clean up. */
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* nop_cancel *
|
|
*===========================================================================*/
|
|
PUBLIC int nop_cancel(struct driver *dr, message *m)
|
|
{
|
|
/* Nothing to do for cancel. */
|
|
return(OK);
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* nop_select *
|
|
*===========================================================================*/
|
|
PUBLIC int nop_select(struct driver *dr, message *m)
|
|
{
|
|
/* Nothing to do for select. */
|
|
return(OK);
|
|
}
|
|
|
|
/*============================================================================*
|
|
* do_diocntl *
|
|
*============================================================================*/
|
|
PUBLIC int do_diocntl(dp, mp, safe)
|
|
struct driver *dp;
|
|
message *mp; /* pointer to ioctl request */
|
|
int safe; /* addresses or grants? */
|
|
{
|
|
/* Carry out a partition setting/getting request. */
|
|
struct device *dv;
|
|
struct partition entry;
|
|
int s;
|
|
|
|
if (mp->REQUEST != DIOCSETP && mp->REQUEST != DIOCGETP) {
|
|
if(dp->dr_other) {
|
|
return dp->dr_other(dp, mp, safe);
|
|
} else return(ENOTTY);
|
|
}
|
|
|
|
/* Decode the message parameters. */
|
|
if ((dv = (*dp->dr_prepare)(mp->DEVICE)) == NIL_DEV) return(ENXIO);
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|
|
|
if (mp->REQUEST == DIOCSETP) {
|
|
/* Copy just this one partition table entry. */
|
|
if(safe) {
|
|
s=sys_safecopyfrom(mp->IO_ENDPT, (vir_bytes) mp->IO_GRANT,
|
|
0, (vir_bytes) &entry, sizeof(entry), D);
|
|
} else{
|
|
s=sys_datacopy(mp->IO_ENDPT, (vir_bytes) mp->ADDRESS,
|
|
SELF, (vir_bytes) &entry, sizeof(entry));
|
|
}
|
|
if(s != OK)
|
|
return s;
|
|
dv->dv_base = entry.base;
|
|
dv->dv_size = entry.size;
|
|
} else {
|
|
/* Return a partition table entry and the geometry of the drive. */
|
|
entry.base = dv->dv_base;
|
|
entry.size = dv->dv_size;
|
|
(*dp->dr_geometry)(&entry);
|
|
if(safe) {
|
|
s=sys_safecopyto(mp->IO_ENDPT, (vir_bytes) mp->IO_GRANT,
|
|
0, (vir_bytes) &entry, sizeof(entry), D);
|
|
} else {
|
|
s=sys_datacopy(SELF, (vir_bytes) &entry,
|
|
mp->IO_ENDPT, (vir_bytes) mp->ADDRESS, sizeof(entry));
|
|
}
|
|
if (OK != s)
|
|
return s;
|
|
}
|
|
return(OK);
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* mq_queue *
|
|
*===========================================================================*/
|
|
PUBLIC int mq_queue(message *m)
|
|
{
|
|
mq_t *mq, *mi;
|
|
|
|
if(!(mq = mq_get()))
|
|
panic("libdriver","mq_queue: mq_get failed", NO_NUM);
|
|
memcpy(&mq->mq_mess, m, sizeof(mq->mq_mess));
|
|
mq->mq_next = NULL;
|
|
if(!queue_head) {
|
|
queue_head = mq;
|
|
} else {
|
|
for(mi = queue_head; mi->mq_next; mi = mi->mq_next)
|
|
;
|
|
mi->mq_next = mq;
|
|
}
|
|
|
|
return OK;
|
|
}
|
|
|
|
#if 0
|
|
|
|
#define ASYN_NR 100
|
|
PRIVATE asynmsg_t msgtable[ASYN_NR];
|
|
PRIVATE int first_slot= 0, next_slot= 0;
|
|
|
|
PUBLIC int asynsend(dst, mp)
|
|
endpoint_t dst;
|
|
message *mp;
|
|
{
|
|
int r, src_ind, dst_ind;
|
|
unsigned flags;
|
|
|
|
/* Update first_slot */
|
|
for (; first_slot < next_slot; first_slot++)
|
|
{
|
|
flags= msgtable[first_slot].flags;
|
|
if ((flags & (AMF_VALID|AMF_DONE)) == (AMF_VALID|AMF_DONE))
|
|
{
|
|
if (msgtable[first_slot].result != OK)
|
|
{
|
|
printf(
|
|
"asynsend: found completed entry %d with error %d\n",
|
|
first_slot,
|
|
msgtable[first_slot].result);
|
|
}
|
|
continue;
|
|
}
|
|
if (flags != AMF_EMPTY)
|
|
break;
|
|
}
|
|
|
|
if (first_slot >= next_slot)
|
|
{
|
|
/* Reset first_slot and next_slot */
|
|
next_slot= first_slot= 0;
|
|
}
|
|
|
|
if (next_slot >= ASYN_NR)
|
|
{
|
|
/* Tell the kernel to stop processing */
|
|
r= senda(NULL, 0);
|
|
if (r != OK)
|
|
panic(__FILE__, "asynsend: senda failed", r);
|
|
|
|
dst_ind= 0;
|
|
for (src_ind= first_slot; src_ind<next_slot; src_ind++)
|
|
{
|
|
flags= msgtable[src_ind].flags;
|
|
if ((flags & (AMF_VALID|AMF_DONE)) ==
|
|
(AMF_VALID|AMF_DONE))
|
|
{
|
|
if (msgtable[src_ind].result != OK)
|
|
{
|
|
printf(
|
|
"asynsend: found completed entry %d with error %d\n",
|
|
src_ind,
|
|
msgtable[src_ind].result);
|
|
}
|
|
continue;
|
|
}
|
|
if (flags == AMF_EMPTY)
|
|
continue;
|
|
#if 0
|
|
printf("asynsend: copying entry %d to %d\n",
|
|
src_ind, dst_ind);
|
|
#endif
|
|
if (src_ind != dst_ind)
|
|
msgtable[dst_ind]= msgtable[src_ind];
|
|
dst_ind++;
|
|
}
|
|
first_slot= 0;
|
|
next_slot= dst_ind;
|
|
if (next_slot >= ASYN_NR)
|
|
panic(__FILE__, "asynsend: msgtable full", NO_NUM);
|
|
}
|
|
|
|
msgtable[next_slot].dst= dst;
|
|
msgtable[next_slot].msg= *mp;
|
|
msgtable[next_slot].flags= AMF_VALID; /* Has to be last. The kernel
|
|
* scans this table while we
|
|
* are sleeping.
|
|
*/
|
|
next_slot++;
|
|
|
|
/* Tell the kernel to rescan the table */
|
|
return senda(msgtable+first_slot, next_slot-first_slot);
|
|
}
|
|
|
|
#endif
|