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sdnvme: collect useful smart/health info and report via ctl

--- a/sys/src/9/port/sdnvme.c

+++ b/sys/src/9/port/sdnvme.c

@@ -348,6 +348,10 @@

 {

 	Ctlr *ctlr;

 	char *e, *s;

+	u8int *data;

+	u32int *q;

+	u64int n;

+	WS ws;

 	if((ctlr = u->dev->ctlr) == nil || ctlr->ident == nil)

 		return 0;

@@ -359,6 +363,37 @@

 	p = seprint(p, e, "serial\t%.20s\n", (char*)ctlr->ident+4);

 	p = seprint(p, e, "firm\t%.8s\n", (char*)ctlr->ident+64);

 	p = seprint(p, e, "geometry %llud %lud\n", u->sectors, u->secsize);

+

+	/* SMART/health */

+	if((data = mallocalign(0x1000, ctlr->mps, 0, 0)) != nil){

+		q = qcmd(&ws, ctlr, 1, 0x02, 0xffffffff, data, 0x1000);

+		q[10] = (512/4)<<16 | 0x2;

+		q[11] = 0;

+		q[12] = 0;

+		q[13] = 0;

+		q[14] = 0;

+		if(wcmd(&ws, q) == 0){

+			dmaflush(0, data, 0x1000);

+			p = seprint(p, e, "temperature\t%d\n", (data[2]<<8 | data[1]) - 273);

+			p = seprint(p, e, "spare\t%d%%\n", data[3]);

+			p = seprint(p, e, "used\t%d%%\n", data[5]);

+			/* 16 bytes long, ignore the upper half */

+			n = data[144]<<0 | data[145]<<8 | data[146]<<16 | data[147]<<24

+				| (u64int)data[148]<<32

+				| (u64int)data[149]<<40

+				| (u64int)data[150]<<48

+				| (u64int)data[151]<<56;

+			p = seprint(p, e, "unsafe shutdowns\t%llud\n", n);

+			/* 16 bytes long, ignore the upper half */

+			n = data[160]<<0 | data[161]<<8 | data[162]<<16 | data[163]<<24

+				| (u64int)data[164]<<32

+				| (u64int)data[165]<<40

+				| (u64int)data[166]<<48

+				| (u64int)data[167]<<56;

+			p = seprint(p, e, "integrity errors\t%llud\n", n);

+		}

+		free(data);

+	}

 	return p-s;

 }