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[PATCH v11 02/27] powerpc/process: Add the function flush_tmregs_to_thread

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From: Anshuman Khandual <khandual@linux.vnet.ibm.com>

This patch creates a function flush_tmregs_to_thread which
will then be used by subsequent patches in this series. The
function checks for self tracing ptrace interface attempts
while in the TM context and logs appropriate warning message.

Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Shuah Khan <shuahkh@osg.samsung.com>
Cc: Anton Blanchard <anton@samba.org>
Cc: Cyril Bur <cyrilbur@gmail.com>
Cc: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Cc: Simon Guo <wei.guo.simon@gmail.com>
Cc: Ulrich Weigand <ulrich.weigand@de.ibm.com>
Cc: Michael Neuling <mikey@neuling.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Rashmica Gupta <rashmicy@gmail.com>
Cc: Khem Raj <raj.khem@gmail.com>
Cc: Jessica Yu <jeyu@redhat.com>
Cc: Jiri Kosina <jkosina@suse.cz>
Cc: Miroslav Benes <mbenes@suse.cz>
Cc: Suraj Jitindar Singh <sjitindarsingh@gmail.com>
Cc: Chris Smart <chris@distroguy.com>
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-kselftest@vger.kernel.org
Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
---
 arch/powerpc/include/asm/switch_to.h |  8 ++++++++
 arch/powerpc/kernel/process.c        | 20 ++++++++++++++++++++
 2 files changed, 28 insertions(+)

diff --git a/arch/powerpc/include/asm/switch_to.h b/arch/powerpc/include/asm/switch_to.h
index 17c8380..0a74ebe 100644
--- a/arch/powerpc/include/asm/switch_to.h
+++ b/arch/powerpc/include/asm/switch_to.h
@@ -75,6 +75,14 @@ static inline void disable_kernel_spe(void)
 static inline void __giveup_spe(struct task_struct *t) { }
 #endif
 
+#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
+extern void flush_tmregs_to_thread(struct task_struct *);
+#else
+static inline void flush_tmregs_to_thread(struct task_struct *t)
+{
+}
+#endif
+
 static inline void clear_task_ebb(struct task_struct *t)
 {
 #ifdef CONFIG_PPC_BOOK3S_64
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 852f257..36d44ec 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -1027,6 +1027,26 @@ static inline void restore_sprs(struct thread_struct *old_thread,
 #endif
 }
 
+#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
+void flush_tmregs_to_thread(struct task_struct *tsk)
+{
+	/*
+	 * Process self tracing is not yet supported through
+	 * ptrace interface. Ptrace generic code should have
+	 * prevented this from happening in the first place.
+	 * Warn once here with the message, if some how it
+	 * is attempted.
+	 */
+	WARN_ONCE(tsk == current,
+		"Not expecting ptrace on self: TM regs may be incorrect\n");
+
+	/*
+	 * If task is not current, it should have been flushed
+	 * already to it's thread_struct during __switch_to().
+	 */
+}
+#endif
+
 struct task_struct *__switch_to(struct task_struct *prev,
 	struct task_struct *new)
 {
-- 
1.8.3.1

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[PATCH v11 00/27] Add new powerpc specific ELF core notes wei.guo.simon@gmail.com - 2016-07-17 04:10 +0200
  [PATCH v11 05/27] powerpc/ptrace: Enable support for NT_PPC_CFPR wei.guo.simon@gmail.com - 2016-07-17 04:10 +0200
  [PATCH v11 25/27] selftests/powerpc: Add ptrace tests for TM SPR registers wei.guo.simon@gmail.com - 2016-07-17 04:10 +0200
  [PATCH v11 11/27] powerpc/ptrace: Enable support for EBB registers wei.guo.simon@gmail.com - 2016-07-17 04:10 +0200
  [PATCH v11 18/27] selftests/powerpc: Add ptrace tests for GPR/FPR registers in suspended TM wei.guo.simon@gmail.com - 2016-07-17 04:10 +0200
  [PATCH v11 27/27] selftests/powerpc: Fix a build issue wei.guo.simon@gmail.com - 2016-07-17 04:10 +0200
  [PATCH v11 26/27] selftests/powerpc: Add .gitignore file for ptrace executables wei.guo.simon@gmail.com - 2016-07-17 04:10 +0200
  [PATCH v11 02/27] powerpc/process: Add the function flush_tmregs_to_thread wei.guo.simon@gmail.com - 2016-07-17 04:10 +0200
  [PATCH v11 03/27] powerpc/ptrace: Adapt gpr32_get, gpr32_set functions for transaction wei.guo.simon@gmail.com - 2016-07-17 04:10 +0200
  [PATCH v11 07/27] powerpc/ptrace: Enable support for NT_PPC_CVSX wei.guo.simon@gmail.com - 2016-07-17 04:10 +0200
  [PATCH v11 19/27] selftests/powerpc: Add ptrace tests for TAR, PPR, DSCR registers wei.guo.simon@gmail.com - 2016-07-17 04:10 +0200
  [PATCH v11 10/27] powerpc/ptrace: Enable support for NT_PPPC_TAR, NT_PPC_PPR, NT_PPC_DSCR wei.guo.simon@gmail.com - 2016-07-17 04:10 +0200
  [PATCH v11 21/27] selftests/powerpc: Add ptrace tests for TAR, PPR, DSCR in suspended TM wei.guo.simon@gmail.com - 2016-07-17 04:10 +0200
  [PATCH v11 16/27] selftests/powerpc: Add ptrace tests for GPR/FPR registers wei.guo.simon@gmail.com - 2016-07-17 04:10 +0200
  [PATCH v11 14/27] selftests/powerpc: Use the new SPRN_DSCR_PRIV definiton wei.guo.simon@gmail.com - 2016-07-17 04:10 +0200

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