linux-kernel - [PATCH] xtensa: report trax and perf counters in cpuinfo

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Message-Id: <20230609154306.1911894-1-jcmvbkbc@gmail.com>
Date:   Fri,  9 Jun 2023 08:43:06 -0700
From:   Max Filippov <jcmvbkbc@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     Chris Zankel <chris@...kel.net>, Max Filippov <jcmvbkbc@...il.com>
Subject: [PATCH] xtensa: report trax and perf counters in cpuinfo

Add 'trax' to the list of CPU features when xtensa core is configured
with TRAX.
Add 'perf' to the list of CPU features when xtensa core is configured
with perf counters and show the number of configured perf counters.

Signed-off-by: Max Filippov <jcmvbkbc@...il.com>
---
 arch/xtensa/include/asm/core.h |  8 ++++++++
 arch/xtensa/kernel/setup.c     | 12 ++++++++++--
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/arch/xtensa/include/asm/core.h b/arch/xtensa/include/asm/core.h
index f856d2bcb9f3..0e1bb6f019d6 100644
--- a/arch/xtensa/include/asm/core.h
+++ b/arch/xtensa/include/asm/core.h
@@ -26,6 +26,14 @@
 #define XCHAL_SPANNING_WAY 0
 #endif
 
+#ifndef XCHAL_HAVE_TRAX
+#define XCHAL_HAVE_TRAX 0
+#endif
+
+#ifndef XCHAL_NUM_PERF_COUNTERS
+#define XCHAL_NUM_PERF_COUNTERS 0
+#endif
+
 #if XCHAL_HAVE_WINDOWED
 #if defined(CONFIG_USER_ABI_DEFAULT) || defined(CONFIG_USER_ABI_CALL0_PROBE)
 /* Whether windowed ABI is supported in userspace. */
diff --git a/arch/xtensa/kernel/setup.c b/arch/xtensa/kernel/setup.c
index ba20c6800fd4..357e7b0dff09 100644
--- a/arch/xtensa/kernel/setup.c
+++ b/arch/xtensa/kernel/setup.c
@@ -587,6 +587,12 @@ c_show(struct seq_file *f, void *slot)
 # if XCHAL_HAVE_OCD
 		     "ocd "
 # endif
+#if XCHAL_HAVE_TRAX
+		     "trax "
+#endif
+#if XCHAL_NUM_PERF_COUNTERS
+		     "perf "
+#endif
 #endif
 #if XCHAL_HAVE_DENSITY
 	    	     "density "
@@ -636,11 +642,13 @@ c_show(struct seq_file *f, void *slot)
 	seq_printf(f,"physical aregs\t: %d\n"
 		     "misc regs\t: %d\n"
 		     "ibreak\t\t: %d\n"
-		     "dbreak\t\t: %d\n",
+		     "dbreak\t\t: %d\n"
+		     "perf counters\t: %d\n",
 		     XCHAL_NUM_AREGS,
 		     XCHAL_NUM_MISC_REGS,
 		     XCHAL_NUM_IBREAK,
-		     XCHAL_NUM_DBREAK);
+		     XCHAL_NUM_DBREAK,
+		     XCHAL_NUM_PERF_COUNTERS);
 
 
 	/* Interrupt. */
-- 
2.30.2