linux-kernel - [PATCH] firmware: dmi: Add info message for number of populated and total memory slots

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Date: Tue, 5 Mar 2024 21:55:26 +0100
From: Heiner Kallweit <hkallweit1@...il.com>
To: Jean Delvare <jdelvare@...e.com>
Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH] firmware: dmi: Add info message for number of populated and
 total memory slots

As part of adding support for calling i2c_register_spd() on muxed SMBUS
segments the same message has been removed from i2c_register_spd().
However users may find it useful, therefore reintroduce it as part of
the DMI scan code.

Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
---
 drivers/firmware/dmi_scan.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c
index 015c95a82..2c682b580 100644
--- a/drivers/firmware/dmi_scan.c
+++ b/drivers/firmware/dmi_scan.c
@@ -42,6 +42,7 @@ static struct dmi_memdev_info {
 	u8 type;		/* DDR2, DDR3, DDR4 etc */
 } *dmi_memdev;
 static int dmi_memdev_nr;
+static int dmi_memdev_populated_nr;
 
 static const char * __init dmi_string_nosave(const struct dmi_header *dm, u8 s)
 {
@@ -448,6 +449,9 @@ static void __init save_mem_devices(const struct dmi_header *dm, void *v)
 	else
 		bytes = (u64)get_unaligned((u32 *)&d[0x1C]) << 20;
 
+	if (bytes)
+		dmi_memdev_populated_nr++;
+
 	dmi_memdev[nr].size = bytes;
 	nr++;
 }
@@ -824,6 +828,8 @@ void __init dmi_setup(void)
 		return;
 
 	dmi_memdev_walk();
+	pr_info("DMI: Memory slots populated: %d/%d\n",
+		dmi_memdev_populated_nr, dmi_memdev_nr);
 	dump_stack_set_arch_desc("%s", dmi_ids_string);
 }
 
-- 
2.44.0