patch 'eal/x86: add AMD vendor check for TSC calibration' has been queued to stable release 23.11.1

[Xueming Li]

Hi,

FYI, your patch has been queued to stable release 23.11.1

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 03/31/24. So please
shout if anyone has objections.

Also note that after the patch there's a diff of the upstream commit vs the
patch applied to the branch. This will indicate if there was any rebasing
needed to apply to the stable branch. If there were code changes for rebasing
(ie: not only metadata diffs), please double check that the rebase was
correctly done.

Queued patches are on a temporary branch at:
https://git.dpdk.org/dpdk-stable/log/?h=23.11-staging

This queued commit can be viewed at:
https://git.dpdk.org/dpdk-stable/commit/?h=23.11-staging&id=5f30c47cc54f320a4f7bffdd06abcbe6cc2bc7d0

Thanks.

Xueming Li <xuemingl at nvidia.com>

---
>From 5f30c47cc54f320a4f7bffdd06abcbe6cc2bc7d0 Mon Sep 17 00:00:00 2001
From: Sivaprasad Tummala <sivaprasad.tummala at amd.com>
Date: Wed, 22 Nov 2023 23:27:30 -0800
Subject: [PATCH] eal/x86: add AMD vendor check for TSC calibration
Cc: Xueming Li <xuemingl at nvidia.com>

[ upstream commit 31d72ff4dc7c057366153e9918ac92bf9123a3bc ]

AMD Epyc processors doesn't support get_tsc_freq_arch().
The patch allows graceful return to allow fallback to
alternate TSC calibration.

Fixes: 3dbc565e81a0 ("timer: honor arch-specific TSC frequency query")

Signed-off-by: Sivaprasad Tummala <sivaprasad.tummala at amd.com>
Acked-by: Ferruh Yigit <ferruh.yigit at amd.com>
---
 lib/eal/x86/rte_cycles.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/lib/eal/x86/rte_cycles.c b/lib/eal/x86/rte_cycles.c
index 69ed59b4f0..f147a5231d 100644
--- a/lib/eal/x86/rte_cycles.c
+++ b/lib/eal/x86/rte_cycles.c
@@ -10,6 +10,10 @@
 #include <cpuid.h>
 #endif

+#define x86_vendor_amd(t1, t2, t3)        \
+	((t1 == 0x68747541) && /* htuA */   \
+	 (t2 == 0x444d4163) && /* DMAc */   \
+	 (t3 == 0x69746e65))   /* itne */

 #include "eal_private.h"

@@ -110,6 +114,18 @@ get_tsc_freq_arch(void)
 	uint8_t mult, model;
 	int32_t ret;

+#ifdef RTE_TOOLCHAIN_MSVC
+	__cpuid(cpuinfo, 0);
+	a = cpuinfo[0];
+	b = cpuinfo[1];
+	c = cpuinfo[2];
+	d = cpuinfo[3];
+#else
+	__cpuid(0, a, b, c, d);
+#endif
+	if (x86_vendor_amd(b, c, d))
+		return 0;
+
 	/*
 	 * Time Stamp Counter and Nominal Core Crystal Clock
 	 * Information Leaf
--
2.34.1

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2024-03-05 17:39:31.808571927 +0800
+++ 0024-eal-x86-add-AMD-vendor-check-for-TSC-calibration.patch	2024-03-05 17:39:30.703566491 +0800
@@ -1 +1 @@
-From 31d72ff4dc7c057366153e9918ac92bf9123a3bc Mon Sep 17 00:00:00 2001
+From 5f30c47cc54f320a4f7bffdd06abcbe6cc2bc7d0 Mon Sep 17 00:00:00 2001
@@ -4,0 +5,3 @@
+Cc: Xueming Li <xuemingl at nvidia.com>
+
+[ upstream commit 31d72ff4dc7c057366153e9918ac92bf9123a3bc ]
@@ -11 +13,0 @@
-Cc: stable at dpdk.org