xtensa: enable context tracking

Put user exit context tracking call on the common kernel entry/exit path
(function calls are impossible at earlier kernel entry stages because
PS.EXCM is not cleared yet). Put user entry context tracking call on the
user exit path. Syscalls go through this common code too, so nothing
specific needs to be done for them.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

diff --git a/Documentation/features/time/context-tracking/arch-support.txt b/Documentation/features/time/context-tracking/arch-support.txt
index bb1c180..72e7aad 100644 (file)
--- a/Documentation/features/time/context-tracking/arch-support.txt
+++ b/Documentation/features/time/context-tracking/arch-support.txt
@@ -27,5 +27,5 @@
     |       sparc: |  ok  |
     |          um: | TODO |
     |         x86: |  ok  |
-    |      xtensa: | TODO |
+    |      xtensa: |  ok  |
     -----------------------

diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index bca2763..553144a 100644 (file)
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig
@@ -31,6 +31,7 @@ config XTENSA
        select HAVE_ARCH_KASAN if MMU && !XIP_KERNEL
        select HAVE_ARCH_SECCOMP_FILTER
        select HAVE_ARCH_TRACEHOOK
+       select HAVE_CONTEXT_TRACKING
        select HAVE_DEBUG_KMEMLEAK
        select HAVE_DMA_CONTIGUOUS
        select HAVE_EXIT_THREAD

diff --git a/arch/xtensa/kernel/entry.S b/arch/xtensa/kernel/entry.S
index d09f2c3..f2c789a 100644 (file)
--- a/arch/xtensa/kernel/entry.S
+++ b/arch/xtensa/kernel/entry.S
@@ -456,6 +456,12 @@ KABI_W     or      a3, a3, a2
        beqz            abi_tmp0, 1f
        abi_call        trace_hardirqs_off
 1:
+#endif
+#ifdef CONFIG_CONTEXT_TRACKING
+       l32i            abi_tmp0, a1, PT_PS
+       bbci.l          abi_tmp0, PS_UM_BIT, 1f
+       abi_call        context_tracking_user_exit
+1:
 #endif
 
        /* Go to second-level dispatcher. Set up parameters to pass to the
@@ -540,6 +546,9 @@ common_exception_return:
        j               .Lrestore_state
 
 .Lexit_tif_loop_user:
+#ifdef CONFIG_CONTEXT_TRACKING
+       abi_call        context_tracking_user_enter
+#endif
 #ifdef CONFIG_HAVE_HW_BREAKPOINT
        _bbci.l         abi_saved0, TIF_DB_DISABLED, 1f
        abi_call        restore_dbreak