linux-kernel - [PATCH v2 4/4] acpi_mrrm: fake for testing, do not apply!

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Message-ID: <20250227224828.306537-5-tony.luck@intel.com>
Date: Thu, 27 Feb 2025 14:48:28 -0800
From: Tony Luck <tony.luck@...el.com>
To: "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Len Brown <lenb@...nel.org>
Cc: linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	patches@...ts.linux.dev,
	Tony Luck <tony.luck@...el.com>
Subject: [PATCH v2 4/4] acpi_mrrm: fake for testing, do not apply!

Dummy MRRM table for a 2 socket system with memory map:

						LocalAccess RemoteAccess
0-3.5G		DDR on socket 0			0	    1
2G-512G		More DDR on socket 0		0	    1
512G-1T		DDR on socket 1			0	    1
1T-2T		Reserved for CXL on socket 0	2	    3
2T-3T		Reserved for CXL on socket 1	2	    3

This tags all local DDR access in region 0, remote DDR in region 1,
local CXL in region 2, and remote CXL in region 3.

Presented to user like this:

$ cd /sys/firmware/acpi
$ grep ^ memory_ranges/*/*
memory_ranges/range0/base:0x0
memory_ranges/range0/length:0xe0000000
memory_ranges/range0/local_region_id:0x0
memory_ranges/range0/remote_region_id:0x1
memory_ranges/range1/base:0x100000000
memory_ranges/range1/length:0x7f00000000
memory_ranges/range1/local_region_id:0x0
memory_ranges/range1/remote_region_id:0x1
memory_ranges/range2/base:0x8000000000
memory_ranges/range2/length:0x8000000000
memory_ranges/range2/local_region_id:0x0
memory_ranges/range2/remote_region_id:0x1
memory_ranges/range3/base:0x10000000000
memory_ranges/range3/length:0x100000000000
memory_ranges/range3/local_region_id:0x2
memory_ranges/range3/remote_region_id:0x3
memory_ranges/range4/base:0x200000000000
memory_ranges/range4/length:0x100000000000
memory_ranges/range4/local_region_id:0x2
memory_ranges/range4/remote_region_id:0x3

Signed-off-by: Tony Luck <tony.luck@...el.com>
---
 drivers/acpi/acpi_mrrm.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/acpi/acpi_mrrm.c b/drivers/acpi/acpi_mrrm.c
index 1f7d0381a628..16f0ca7072e0 100644
--- a/drivers/acpi/acpi_mrrm.c
+++ b/drivers/acpi/acpi_mrrm.c
@@ -147,11 +147,35 @@ static __init int add_boot_memory_ranges(void)
 	return ret;
 }
 
+#define FAKE 1
+#ifdef FAKE
+static const u8 fake_mrrm[] = {
+	0x4D,0x52,0x52,0x4D,0xE0,0x00,0x00,0x00,0x01,0x3A,0x49,0x4E,0x54,0x45,0x4C,0x00,
+	0x49,0x4E,0x54,0x45,0x4C,0x20,0x49,0x44,0x02,0x00,0x00,0x00,0x49,0x4E,0x54,0x4C,
+	0x12,0x12,0x24,0x20,0x04,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+	0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+	0x00,0x00,0x20,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+	0x00,0x00,0x00,0xE0,0x00,0x00,0x00,0x00,0x03,0x00,0x00,0x01,0x00,0x00,0x00,0x00,
+	0x00,0x00,0x20,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x00,0x00,0x00,
+	0x00,0x00,0x00,0x00,0x7F,0x00,0x00,0x00,0x03,0x00,0x00,0x01,0x00,0x00,0x00,0x00,
+	0x00,0x00,0x20,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0x00,0x00,0x00,
+	0x00,0x00,0x00,0x00,0x80,0x00,0x00,0x00,0x03,0x00,0x00,0x01,0x00,0x00,0x00,0x00,
+	0x00,0x00,0x20,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x00,0x00,
+	0x00,0x00,0x00,0x00,0x00,0x10,0x00,0x00,0x03,0x00,0x02,0x03,0x00,0x00,0x00,0x00,
+	0x00,0x00,0x20,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x20,0x00,0x00,
+	0x00,0x00,0x00,0x00,0x00,0x10,0x00,0x00,0x03,0x00,0x02,0x03,0x00,0x00,0x00,0x00
+};
+#endif
+
 static __init int mrrm_init(void)
 {
 	int ret;
 
+#ifdef FAKE
+	ret = acpi_parse_mrrm((struct acpi_table_header *)fake_mrrm);
+#else
 	ret = acpi_table_parse(ACPI_SIG_MRRM, acpi_parse_mrrm);
+#endif
 
 	if (ret < 0)
 		return ret;
-- 
2.48.1