Add support DIOC{G,S}CACHE to mfi(4). Cache of disk on mfi(4) will

be enabled by default.  Also if the controller doesn't have any RAM,
the cache on the physical disk will be enabled.

discuss with jsg tsubai
ok dlg

2 files changed, 108 insertions, 6 deletions

diff --git a/sys/dev/ic/mfi.c b/sys/dev/ic/mfi.c
index a4d355ec719..699f7458926 100644
--- a/sys/dev/ic/mfi.c
+++ b/sys/dev/ic/mfi.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: mfi.c,v 1.158 2014/12/19 07:23:57 deraadt Exp $ */
+/* $OpenBSD: mfi.c,v 1.159 2015/01/09 11:17:29 yasuoka Exp $ */
 /*
  * Copyright (c) 2006 Marco Peereboom <marco@peereboom.us>
  *
@@ -27,6 +27,7 @@
 #include <sys/malloc.h>
 #include <sys/rwlock.h>
 #include <sys/sensors.h>
+#include <sys/dkio.h>
 #include <sys/pool.h>
 
 #include <machine/bus.h>
@@ -58,6 +59,7 @@ struct cfdriver mfi_cd = {
 
 void	mfi_scsi_cmd(struct scsi_xfer *);
 int	mfi_scsi_ioctl(struct scsi_link *, u_long, caddr_t, int);
+int	mfi_ioctl_cache(struct scsi_link *, u_long,  struct dk_cache *);
 void	mfiminphys(struct buf *bp, struct scsi_link *sl);
 
 void	mfi_pd_scsi_cmd(struct scsi_xfer *);
@@ -1419,10 +1421,98 @@ mfi_scsi_ioctl(struct scsi_link *link, u_long cmd, caddr_t addr, int flag)
 
 	DNPRINTF(MFI_D_IOCTL, "%s: mfi_scsi_ioctl\n", DEVNAME(sc));
 
-	if (sc->sc_ioctl)
-		return (sc->sc_ioctl(link->adapter_softc, cmd, addr));
-	else
-		return (ENOTTY);
+	switch (cmd) {
+	case DIOCGCACHE:
+	case DIOCSCACHE:
+		return (mfi_ioctl_cache(link, cmd, (struct dk_cache *)addr));
+		break;
+
+	default:
+		if (sc->sc_ioctl)
+			return (sc->sc_ioctl(link->adapter_softc, cmd, addr));
+		break;
+	}
+
+	return (ENOTTY);
+}
+
+int
+mfi_ioctl_cache(struct scsi_link *link, u_long cmd,  struct dk_cache *dc)
+{
+	struct mfi_softc	*sc = (struct mfi_softc *)link->adapter_softc;
+	int			 rv, wrenable, rdenable;
+	struct mfi_ld_prop	 ldp;
+	uint8_t			 mbox[MFI_MBOX_SIZE];
+
+	if (mfi_get_info(sc)) {
+		rv = EIO;
+		goto done;
+	}
+
+	if (!sc->sc_ld[link->target].ld_present) {
+		rv = EIO;
+		goto done;
+	}
+
+	mbox[0] = link->target;
+	if ((rv = mfi_mgmt(sc, MR_DCMD_LD_GET_PROPERTIES, MFI_DATA_IN,
+	    sizeof(ldp), &ldp, mbox)) != 0)
+		goto done;
+
+	if (sc->sc_info.mci_memory_size > 0) {
+		wrenable = ISSET(ldp.mlp_cur_cache_policy,
+		    MR_LD_CACHE_ALLOW_WRITE_CACHE)? 1 : 0;
+		rdenable = ISSET(ldp.mlp_cur_cache_policy,
+		    MR_LD_CACHE_ALLOW_READ_CACHE)? 1 : 0;
+	} else {
+		wrenable = ISSET(ldp.mlp_diskcache_policy,
+		    MR_LD_DISK_CACHE_ENABLE)? 1 : 0;
+		rdenable = 0;
+	}
+
+	if (cmd == DIOCGCACHE) {
+		dc->wrcache = wrenable;
+		dc->rdcache = rdenable;
+		goto done;
+	} /* else DIOCSCACHE */
+
+	if (((dc->wrcache) ? 1 : 0) == wrenable &&
+	    ((dc->rdcache) ? 1 : 0) == rdenable)
+		goto done;
+
+	mbox[0] = ldp.mlp_ld.mld_target;
+	mbox[1] = ldp.mlp_ld.mld_res;
+	*(uint16_t *)&mbox[2] = ldp.mlp_ld.mld_seq;
+
+	if (sc->sc_info.mci_memory_size > 0) {
+		if (dc->rdcache)
+			SET(ldp.mlp_cur_cache_policy,
+			    MR_LD_CACHE_ALLOW_READ_CACHE);
+		else
+			CLR(ldp.mlp_cur_cache_policy,
+			    MR_LD_CACHE_ALLOW_READ_CACHE);
+		if (dc->wrcache)
+			SET(ldp.mlp_cur_cache_policy,
+			    MR_LD_CACHE_ALLOW_WRITE_CACHE);
+		else
+			CLR(ldp.mlp_cur_cache_policy,
+			    MR_LD_CACHE_ALLOW_WRITE_CACHE);
+	} else {
+		if (dc->rdcache) {
+			rv = EOPNOTSUPP;
+			goto done;
+		}
+		if (dc->wrcache)
+			ldp.mlp_diskcache_policy = MR_LD_DISK_CACHE_ENABLE;
+		else
+			ldp.mlp_diskcache_policy = MR_LD_DISK_CACHE_DISABLE;
+	}
+
+	if ((rv = mfi_mgmt(sc, MR_DCMD_LD_SET_PROPERTIES, MFI_DATA_OUT,
+	    sizeof(ldp), &ldp, mbox)) != 0)
+		goto done;
+done:
+	return (rv);
 }
 
 #if NBIO > 0
diff --git a/sys/dev/ic/mfireg.h b/sys/dev/ic/mfireg.h
index d2a762ea89f..64fb22f34dc 100644
--- a/sys/dev/ic/mfireg.h
+++ b/sys/dev/ic/mfireg.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: mfireg.h,v 1.41 2014/08/15 02:27:02 yasuoka Exp $ */
+/* $OpenBSD: mfireg.h,v 1.42 2015/01/09 11:17:29 yasuoka Exp $ */
 /*
  * Copyright (c) 2006 Marco Peereboom <marco@peereboom.us>
  *
@@ -119,6 +119,7 @@
 #define MR_DCMD_LD_GET_LIST			0x03010000
 #define MR_DCMD_LD_GET_INFO			0x03020000
 #define MR_DCMD_LD_GET_PROPERTIES		0x03030000
+#define MR_DCMD_LD_SET_PROPERTIES		0x03040000
 #define MR_DCMD_CONF_GET			0x04010000
 #define MR_DCMD_BBU_GET_STATUS			0x05010000
 #define MR_DCMD_BBU_GET_CAPACITY_INFO		0x05020000
@@ -136,6 +137,17 @@
 #define MR_DCMD_SPEAKER_SILENCE			0x01030400
 #define MR_DCMD_SPEAKER_TEST			0x01030500
 
+#define MR_LD_CACHE_WRITE_BACK			0x01
+#define MR_LD_CACHE_WRITE_ADAPTIVE		0x02
+#define MR_LD_CACHE_READ_AHEAD	       		0x04
+#define MR_LD_CACHE_READ_ADAPTIVE		0x08
+#define MR_LD_CACHE_WRITE_CACHE_BAD_BBU		0x10
+#define MR_LD_CACHE_ALLOW_WRITE_CACHE		0x20
+#define MR_LD_CACHE_ALLOW_READ_CACHE		0x40
+
+#define MR_LD_DISK_CACHE_ENABLE			0x01
+#define MR_LD_DISK_CACHE_DISABLE		0x02
+
 /* mailbox bytes in direct command */
 #define MFI_MBOX_SIZE				12