From: Anshuman Khandual <khandual@linux.vnet.ibm.com>
To: linuxppc-dev@ozlabs.org, linux-kernel@vger.kernel.org
Cc: mikey@neuling.org
Subject: [PATCH V4 1/5] powerpc, perf: Add new BHRB related instructions for POWER8
Date: Tue, 23 Apr 2013 11:12:40 +0530 [thread overview]
Message-ID: <1366695764-3073-2-git-send-email-khandual@linux.vnet.ibm.com> (raw)
In-Reply-To: <1366695764-3073-1-git-send-email-khandual@linux.vnet.ibm.com>
This patch adds new POWER8 instruction encoding for reading
and clearing Branch History Rolling Buffer entries. The new
instruction 'mfbhrbe' (move from branch history rolling buffer
entry) is used to read BHRB buffer entries and instruction
'clrbhrb' (clear branch history rolling buffer) is used to
clear the entire buffer. The instruction 'clrbhrb' has straight
forward encoding. But the instruction encoding format for
reading the BHRB entries is like 'mfbhrbe RT, BHRBE' where it
takes two arguments, i.e the index for the BHRB buffer entry to
read and a general purpose register to put the value which was
read from the buffer entry.
Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
---
arch/powerpc/include/asm/ppc-opcode.h | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/arch/powerpc/include/asm/ppc-opcode.h b/arch/powerpc/include/asm/ppc-opcode.h
index 8752bc8..0c34e48 100644
--- a/arch/powerpc/include/asm/ppc-opcode.h
+++ b/arch/powerpc/include/asm/ppc-opcode.h
@@ -82,6 +82,8 @@
#define __REGA0_R31 31
/* sorted alphabetically */
+#define PPC_INST_BHRBE 0x7c00025c
+#define PPC_INST_CLRBHRB 0x7c00035c
#define PPC_INST_DCBA 0x7c0005ec
#define PPC_INST_DCBA_MASK 0xfc0007fe
#define PPC_INST_DCBAL 0x7c2005ec
@@ -297,6 +299,12 @@
#define PPC_NAP stringify_in_c(.long PPC_INST_NAP)
#define PPC_SLEEP stringify_in_c(.long PPC_INST_SLEEP)
+/* BHRB instructions */
+#define PPC_CLRBHRB stringify_in_c(.long PPC_INST_CLRBHRB)
+#define PPC_MFBHRBE(r, n) stringify_in_c(.long PPC_INST_BHRBE | \
+ __PPC_RT(r) | \
+ (((n) & 0x3ff) << 11))
+
/* Transactional memory instructions */
#define TRECHKPT stringify_in_c(.long PPC_INST_TRECHKPT)
#define TRECLAIM(r) stringify_in_c(.long PPC_INST_TRECLAIM \
--
1.7.11.7
next prev parent reply other threads:[~2013-04-23 5:43 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-23 5:42 [PATCH V4 0/5] powerpc, perf: BHRB based branch stack enablement on POWER8 Anshuman Khandual
2013-04-23 5:42 ` Anshuman Khandual [this message]
2013-04-23 5:42 ` [PATCH V4 2/5] powerpc, perf: Add basic assembly code to read BHRB entries " Anshuman Khandual
2013-04-23 5:42 ` [PATCH V4 3/5] powerpc, perf: Add new BHRB related generic functions, data and flags Anshuman Khandual
2013-04-23 5:42 ` [PATCH V4 4/5] powerpc, perf: Define BHRB generic functions, data and flags for POWER8 Anshuman Khandual
2013-04-23 5:42 ` [PATCH V4 5/5] powerpc, perf: Enable branch stack sampling framework Anshuman Khandual
2013-04-26 3:11 ` [PATCH V4 0/5] powerpc, perf: BHRB based branch stack enablement on POWER8 Michael Neuling
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