From a366002cdff09387ac8fc25e170fc269d5b757e9 Mon Sep 17 00:00:00 2001
From: Taylor R Campbell <riastradh@NetBSD.org>
Date: Sat, 13 Aug 2022 01:53:51 +0000
Subject: [PATCH] spiflash(4): Answer DIOCGPARTINFO with basic size
 information.

---
 sys/dev/spi/spiflash.c | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/sys/dev/spi/spiflash.c b/sys/dev/spi/spiflash.c
index 3332a9b0e44a..df48ee7f8339 100644
--- a/sys/dev/spi/spiflash.c
+++ b/sys/dev/spi/spiflash.c
@@ -297,12 +297,34 @@ int
 spiflash_ioctl(dev_t dev, u_long cmd, void *data, int flags, struct lwp *l)
 {
 	spiflash_handle_t sc;
+	int error;
 
 	sc = device_lookup_private(&spiflash_cd, DISKUNIT(dev));
 	if (sc == NULL)
 		return ENXIO;
 
-	return EINVAL;
+	switch (cmd) {
+	case DIOCGPARTINFO: {
+		struct partinfo *pi = data;
+		unsigned secsize;
+
+		secsize = MAX(sc->sc_write_size, sc->sc_read_size);
+		secsize = MAX(DEV_BSIZE, secsize); /* paranoia */
+
+		memset(pi, 0, sizeof(*pi));
+		pi->pi_offset = 0;
+		pi->pi_secsize = secsize;
+		pi->pi_size = sc->sc_device_size / secsize;
+		pi->pi_bsize = MAX(BLKDEV_IOSIZE, secsize);
+
+		error = 0;
+		break;
+	}
+	default:
+		error = ENOTTY;
+	}
+
+	return error;
 }
 
 void