Let the sdmmc adapters tell the sdmmc layer how much sectors they can

transfer with one command. Build on this and the recent minphys() changes
in the sdmmc layer to crank transfers at the maximum possible size instead
of a sad DEV_BSIZE.

Depending on your controller, this can speed up sdmmc I/O up to 2.5 times.

5 files changed, 25 insertions, 16 deletions

diff --git a/sys/dev/sdmmc/sdmmc.c b/sys/dev/sdmmc/sdmmc.c
index 5398b51fab9..a710623b535 100644
--- a/sys/dev/sdmmc/sdmmc.c
+++ b/sys/dev/sdmmc/sdmmc.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: sdmmc.c,v 1.18 2009/01/09 10:58:38 jsg Exp $	*/
+/*	$OpenBSD: sdmmc.c,v 1.19 2009/02/20 19:16:35 miod Exp $	*/
 
 /*
  * Copyright (c) 2006 Uwe Stuehler <uwe@openbsd.org>
@@ -102,6 +102,8 @@ sdmmc_attach(struct device *parent, struct device *self, void *aux)
 
 	sc->sct = saa->sct;
 	sc->sch = saa->sch;
+	sc->sc_flags = saa->flags;
+	sc->sc_max_xfer = saa->max_xfer;
 
 	SIMPLEQ_INIT(&sc->sf_head);
 	TAILQ_INIT(&sc->sc_tskq);
diff --git a/sys/dev/sdmmc/sdmmc_mem.c b/sys/dev/sdmmc/sdmmc_mem.c
index 4f7246afa07..682f8e9c5bb 100644
--- a/sys/dev/sdmmc/sdmmc_mem.c
+++ b/sys/dev/sdmmc/sdmmc_mem.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: sdmmc_mem.c,v 1.10 2009/01/09 10:55:22 jsg Exp $	*/
+/*	$OpenBSD: sdmmc_mem.c,v 1.11 2009/02/20 19:16:35 miod Exp $	*/
 
 /*
  * Copyright (c) 2006 Uwe Stuehler <uwe@openbsd.org>
@@ -425,9 +425,8 @@ sdmmc_mem_read_block(struct sdmmc_function *sf, int blkno, u_char *data,
 	if (error != 0)
 		goto err;
 
-	/* XXX sdhc(4) does not need this */
-#ifdef __zaurus__
-	if (cmd.c_opcode == MMC_READ_BLOCK_MULTIPLE) {
+	if (ISSET(sc->sc_flags, SMF_STOP_AFTER_MULTIPLE) &&
+	    cmd.c_opcode == MMC_READ_BLOCK_MULTIPLE) {
 		bzero(&cmd, sizeof cmd);
 		cmd.c_opcode = MMC_STOP_TRANSMISSION;
 		cmd.c_arg = MMC_ARG_RCA(sf->rca);
@@ -436,7 +435,6 @@ sdmmc_mem_read_block(struct sdmmc_function *sf, int blkno, u_char *data,
 		if (error != 0)
 			goto err;
 	}
-#endif
 
 	do {
 		bzero(&cmd, sizeof cmd);
@@ -483,9 +481,8 @@ sdmmc_mem_write_block(struct sdmmc_function *sf, int blkno, u_char *data,
 	if (error != 0)
 		goto err;
 
-	/* XXX sdhc(4) does not need this */
-#ifdef __zaurus__
-	if (cmd.c_opcode == MMC_WRITE_BLOCK_MULTIPLE) {
+	if (ISSET(sc->sc_flags, SMF_STOP_AFTER_MULTIPLE) &&
+	    cmd.c_opcode == MMC_WRITE_BLOCK_MULTIPLE) {
 		bzero(&cmd, sizeof cmd);
 		cmd.c_opcode = MMC_STOP_TRANSMISSION;
 		cmd.c_flags = SCF_CMD_AC | SCF_RSP_R1B;
@@ -493,7 +490,6 @@ sdmmc_mem_write_block(struct sdmmc_function *sf, int blkno, u_char *data,
 		if (error != 0)
 			goto err;
 	}
-#endif
 
 	do {
 		bzero(&cmd, sizeof cmd);
diff --git a/sys/dev/sdmmc/sdmmc_scsi.c b/sys/dev/sdmmc/sdmmc_scsi.c
index 3b324b072b1..8e690ea41ee 100644
--- a/sys/dev/sdmmc/sdmmc_scsi.c
+++ b/sys/dev/sdmmc/sdmmc_scsi.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: sdmmc_scsi.c,v 1.14 2009/02/16 21:19:07 miod Exp $	*/
+/*	$OpenBSD: sdmmc_scsi.c,v 1.15 2009/02/20 19:16:35 miod Exp $	*/
 
 /*
  * Copyright (c) 2006 Uwe Stuehler <uwe@openbsd.org>
@@ -497,8 +497,15 @@ sdmmc_stimeout(void *arg)
 void
 sdmmc_scsi_minphys(struct buf *bp, struct scsi_link *sl)
 {
-	/* XXX limit to max. transfer size supported by card/host? */
-	if (bp->b_bcount > DEV_BSIZE)
-		bp->b_bcount = DEV_BSIZE;
+	struct sdmmc_softc *sc = sl->adapter_softc;
+	struct sdmmc_scsi_softc *scbus = sc->sc_scsibus;
+	struct sdmmc_scsi_target *tgt = &scbus->sc_tgt[sl->target];
+	struct sdmmc_function *sf = tgt->card;
+
+	/* limit to max. transfer size supported by card/host */
+	if (sc->sc_max_xfer != 0 &&
+	    bp->b_bcount > sf->csd.sector_size * sc->sc_max_xfer)
+		bp->b_bcount = sf->csd.sector_size * sc->sc_max_xfer;
+
 	minphys(bp);
 }
diff --git a/sys/dev/sdmmc/sdmmcchip.h b/sys/dev/sdmmc/sdmmcchip.h
index 93969149674..1846b1d192a 100644
--- a/sys/dev/sdmmc/sdmmcchip.h
+++ b/sys/dev/sdmmc/sdmmcchip.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: sdmmcchip.h,v 1.3 2007/05/31 10:09:01 uwe Exp $	*/
+/*	$OpenBSD: sdmmcchip.h,v 1.4 2009/02/20 19:16:35 miod Exp $	*/
 
 /*
  * Copyright (c) 2006 Uwe Stuehler <uwe@openbsd.org>
@@ -77,6 +77,8 @@ struct sdmmcbus_attach_args {
 	const char *saa_busname;
 	sdmmc_chipset_tag_t sct;
 	sdmmc_chipset_handle_t sch;
+	int	flags;
+	long	max_xfer;
 };
 
 void	sdmmc_needs_discover(struct device *);
diff --git a/sys/dev/sdmmc/sdmmcvar.h b/sys/dev/sdmmc/sdmmcvar.h
index a24335a4eb3..88d335f7724 100644
--- a/sys/dev/sdmmc/sdmmcvar.h
+++ b/sys/dev/sdmmc/sdmmcvar.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: sdmmcvar.h,v 1.14 2009/02/06 20:16:41 grange Exp $	*/
+/*	$OpenBSD: sdmmcvar.h,v 1.15 2009/02/20 19:16:35 miod Exp $	*/
 
 /*
  * Copyright (c) 2006 Uwe Stuehler <uwe@openbsd.org>
@@ -162,6 +162,7 @@ struct sdmmc_softc {
 #define SMF_MEM_MODE		0x0004	/* host in memory mode (SD or MMC) */
 #define SMF_CARD_PRESENT	0x0010	/* card presence noticed */
 #define SMF_CARD_ATTACHED	0x0020	/* card driver(s) attached */
+#define	SMF_STOP_AFTER_MULTIPLE	0x0040	/* send a stop after a multiple cmd */
 	int sc_function_count;		/* number of I/O functions (SDIO) */
 	struct sdmmc_function *sc_card;	/* selected card */
 	struct sdmmc_function *sc_fn0;	/* function 0, the card itself */
@@ -174,6 +175,7 @@ struct sdmmc_softc {
 	struct lock sc_lock;		/* lock around host controller */
 	void *sc_scsibus;		/* SCSI bus emulation softc */
 	TAILQ_HEAD(, sdmmc_intr_handler) sc_intrq; /* interrupt handlers */
+	long sc_max_xfer;		/* maximum transfer size */
 };
 
 /*