linux-kernel - [101/129] ACPI, x86: Use SRAT table rev to use 8bit or 32bit PXM fields (x86/x86-64)

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Message-Id: <20120124023932.950847544@clark.kroah.org>
Date:	Mon, 23 Jan 2012 18:35:21 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, x86@...nel.org,
	Kurt Garloff <kurt@...loff.de>, Len Brown <len.brown@...el.com>
Subject: [101/129] ACPI, x86: Use SRAT table rev to use 8bit or 32bit PXM fields (x86/x86-64)

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------
Content-Length: 1483
Lines: 43

From: Kurt Garloff <kurt@...loff.de>

commit cd298f60a2451a16e0f077404bf69b62ec868733 upstream.

In SRAT v1, we had 8bit proximity domain (PXM) fields; SRAT v2 provides
32bits for these. The new fields were reserved before.
According to the ACPI spec, the OS must disregrard reserved fields.

x86/x86-64 was rather inconsistent prior to this patch; it used 8 bits
for the pxm field in cpu_affinity, but 32 bits in mem_affinity.
This patch makes it consistent: Either use 8 bits consistently (SRAT
rev 1 or lower) or 32 bits (SRAT rev 2 or higher).

cc: x86@...nel.org
Signed-off-by: Kurt Garloff <kurt@...loff.de>
Signed-off-by: Len Brown <len.brown@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 arch/x86/mm/srat.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/arch/x86/mm/srat.c
+++ b/arch/x86/mm/srat.c
@@ -104,6 +104,8 @@ acpi_numa_processor_affinity_init(struct
 	if ((pa->flags & ACPI_SRAT_CPU_ENABLED) == 0)
 		return;
 	pxm = pa->proximity_domain_lo;
+	if (acpi_srat_revision >= 2)
+		pxm |= *((unsigned int*)pa->proximity_domain_hi) << 8;
 	node = setup_node(pxm);
 	if (node < 0) {
 		printk(KERN_ERR "SRAT: Too many proximity domains %x\n", pxm);
@@ -155,6 +157,8 @@ acpi_numa_memory_affinity_init(struct ac
 	start = ma->base_address;
 	end = start + ma->length;
 	pxm = ma->proximity_domain;
+	if (acpi_srat_revision <= 1)
+		pxm &= 0xff;
 	node = setup_node(pxm);
 	if (node < 0) {
 		printk(KERN_ERR "SRAT: Too many proximity domains.\n");


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