[src/trunk]: src/sys/dev/ata Implement d_discard for wd.

[dholland <dholland%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/9899a328e195
branches:  trunk
changeset: 797669:9899a328e195
user:      dholland <dholland%NetBSD.org@localhost>
date:      Fri Jul 25 08:22:08 2014 +0000

description:
Implement d_discard for wd.

diffstat:

 sys/dev/ata/wd.c |  67 ++++++++++++++++++++++++++++++++++++++++++++++---------
 1 files changed, 56 insertions(+), 11 deletions(-)

diffs (140 lines):

diff -r daaefebed0b6 -r 9899a328e195 sys/dev/ata/wd.c
--- a/sys/dev/ata/wd.c  Fri Jul 25 08:20:51 2014 +0000
+++ b/sys/dev/ata/wd.c  Fri Jul 25 08:22:08 2014 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: wd.c,v 1.409 2014/07/25 08:10:36 dholland Exp $ */
+/*     $NetBSD: wd.c,v 1.410 2014/07/25 08:22:08 dholland Exp $ */
 
 /*
  * Copyright (c) 1998, 2001 Manuel Bouyer.  All rights reserved.
@@ -54,7 +54,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: wd.c,v 1.409 2014/07/25 08:10:36 dholland Exp $");
+__KERNEL_RCSID(0, "$NetBSD: wd.c,v 1.410 2014/07/25 08:22:08 dholland Exp $");
 
 #include "opt_ata.h"
 
@@ -140,6 +140,7 @@
 dev_type_strategy(wdstrategy);
 dev_type_dump(wddump);
 dev_type_size(wdsize);
+static dev_type_discard(wddiscard);
 
 const struct bdevsw wd_bdevsw = {
        .d_open = wdopen,
@@ -148,7 +149,7 @@
        .d_ioctl = wdioctl,
        .d_dump = wddump,
        .d_psize = wdsize,
-       .d_discard = nodiscard,
+       .d_discard = wddiscard,
        .d_flag = D_DISK
 };
 
@@ -163,7 +164,7 @@
        .d_poll = nopoll,
        .d_mmap = nommap,
        .d_kqfilter = nokqfilter,
-       .d_discard = nodiscard,
+       .d_discard = wddiscard,
        .d_flag = D_DISK
 };
 
@@ -195,7 +196,7 @@
 void  wddone(void *);
 int   wd_get_params(struct wd_softc *, u_int8_t, struct ataparams *);
 int   wd_flushcache(struct wd_softc *, int);
-int   wd_trim(struct wd_softc *, int, struct disk_discard_range *);
+int   wd_trim(struct wd_softc *, int, daddr_t, long);
 bool  wd_shutdown(device_t, int);
 
 int   wd_getcache(struct wd_softc *, int *);
@@ -1562,8 +1563,12 @@
                aprint_debug_dev(wd->sc_dev, "TRIM maxsize %ld\n", tp->maxsize);
                return 0;
        }
-       case DIOCDISCARD:
-               return wd_trim(wd, WDPART(dev), (struct disk_discard_range *)addr);
+       case DIOCDISCARD: {
+               struct disk_discard_range *dr;
+
+               dr = addr;
+               return wd_trim(wd, WDPART(dev), dr->bno, dr->size);
+       }
 
        default:
                return ENOTTY;
@@ -1574,6 +1579,47 @@
 #endif
 }
 
+static int
+wddiscard(dev_t dev, off_t pos, off_t len)
+{
+       struct wd_softc *wd = device_lookup_private(&wd_cd, WDUNIT(dev));
+       daddr_t bno;
+       long size, done;
+       long maxatonce, amount;
+       int result;
+
+       if (!(wd->sc_params.atap_ata_major & WDC_VER_ATA7)
+           || !(wd->sc_params.support_dsm & ATA_SUPPORT_DSM_TRIM)) {
+               /* not supported; ignore request */
+               ATADEBUG_PRINT(("wddiscard (unsupported)\n"), DEBUG_FUNCS);
+               return 0;
+       }
+       maxatonce = 0xffff; /*wd->sc_params.max_dsm_blocks*/
+
+       ATADEBUG_PRINT(("wddiscard\n"), DEBUG_FUNCS);
+
+       if ((wd->sc_flags & WDF_LOADED) == 0)
+               return EIO;
+
+       /* round the start up and the end down */
+       bno = (pos + DEV_BSIZE - 1) >> DEV_BSHIFT;
+       size = ((pos + len) >> DEV_BSHIFT) - bno;
+
+       done = 0;
+       while (done < size) {
+            amount = size - done;
+            if (amount > maxatonce) {
+                    amount = maxatonce;
+            }
+            result = wd_trim(wd, WDPART(dev), bno + done, amount);
+            if (result) {
+                    return result;
+            }
+            done += amount;
+       }
+       return 0;
+}
+
 #ifdef B_FORMAT
 int
 wdformat(struct buf *bp)
@@ -1940,11 +1986,10 @@
 }
 
 int
-wd_trim(struct wd_softc *wd, int part, struct disk_discard_range *tr)
+wd_trim(struct wd_softc *wd, int part, daddr_t bno, long size)
 {
        struct ata_command ata_c;
        unsigned char *req;
-       daddr_t bno = tr->bno;
 
        if (part != RAW_PART)
                bno += wd->sc_dk.dk_label->d_partitions[part].p_offset;;
@@ -1956,8 +2001,8 @@
        req[3] = (bno >> 24) & 0xff;
        req[4] = (bno >> 32) & 0xff;
        req[5] = (bno >> 40) & 0xff;
-       req[6] = tr->size & 0xff;
-       req[7] = (tr->size >> 8) & 0xff;
+       req[6] = size & 0xff;
+       req[7] = (size >> 8) & 0xff;
 
        memset(&ata_c, 0, sizeof(struct ata_command));
        ata_c.r_command = ATA_DATA_SET_MANAGEMENT;