summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorNoam Camus <noamc@ezchip.com>2017-06-15 11:43:59 +0300
committerVineet Gupta <vgupta@synopsys.com>2017-08-29 01:17:36 +0300
commit5b2189ab6ee0717babac912f779dcd440e942173 (patch)
treebbca2deb857ba309aa67aa71d7d74700d823290a
parent3f9cd874dcc8705b53c03431f0ae46c94e572349 (diff)
downloadlinux-5b2189ab6ee0717babac912f779dcd440e942173.tar.xz
ARC: [plat-eznps] handle extra aux regs #1: save/restore on context switch
save EFLAGS, and GPA1 auxiliary registers during context switch, since they may be changed by the new task in kernel mode, while using atomic ops e.g. cmpxchg. Signed-off-by: Noam Camus <noamc@ezchip.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
-rw-r--r--arch/arc/include/asm/processor.h10
-rw-r--r--arch/arc/include/asm/switch_to.h9
-rw-r--r--arch/arc/plat-eznps/Makefile2
-rw-r--r--arch/arc/plat-eznps/ctop.c32
4 files changed, 52 insertions, 1 deletions
diff --git a/arch/arc/include/asm/processor.h b/arch/arc/include/asm/processor.h
index 4104a0839214..d400a2161935 100644
--- a/arch/arc/include/asm/processor.h
+++ b/arch/arc/include/asm/processor.h
@@ -27,6 +27,13 @@ struct arc_fpu {
};
#endif
+#ifdef CONFIG_ARC_PLAT_EZNPS
+struct eznps_dp {
+ unsigned int eflags;
+ unsigned int gpa1;
+};
+#endif
+
/* Arch specific stuff which needs to be saved per task.
* However these items are not so important so as to earn a place in
* struct thread_info
@@ -38,6 +45,9 @@ struct thread_struct {
#ifdef CONFIG_ARC_FPU_SAVE_RESTORE
struct arc_fpu fpu;
#endif
+#ifdef CONFIG_ARC_PLAT_EZNPS
+ struct eznps_dp dp;
+#endif
};
#define INIT_THREAD { \
diff --git a/arch/arc/include/asm/switch_to.h b/arch/arc/include/asm/switch_to.h
index 1b171ab5fec0..f7d07feeea61 100644
--- a/arch/arc/include/asm/switch_to.h
+++ b/arch/arc/include/asm/switch_to.h
@@ -26,10 +26,19 @@ extern void fpu_save_restore(struct task_struct *p, struct task_struct *n);
#endif /* !CONFIG_ARC_FPU_SAVE_RESTORE */
+#ifdef CONFIG_ARC_PLAT_EZNPS
+extern void dp_save_restore(struct task_struct *p, struct task_struct *n);
+#define ARC_EZNPS_DP_PREV(p, n) dp_save_restore(p, n)
+#else
+#define ARC_EZNPS_DP_PREV(p, n)
+
+#endif /* !CONFIG_ARC_PLAT_EZNPS */
+
struct task_struct *__switch_to(struct task_struct *p, struct task_struct *n);
#define switch_to(prev, next, last) \
do { \
+ ARC_EZNPS_DP_PREV(prev, next); \
ARC_FPU_PREV(prev, next); \
last = __switch_to(prev, next);\
ARC_FPU_NEXT(next); \
diff --git a/arch/arc/plat-eznps/Makefile b/arch/arc/plat-eznps/Makefile
index 21091b199df0..8d4371706b2f 100644
--- a/arch/arc/plat-eznps/Makefile
+++ b/arch/arc/plat-eznps/Makefile
@@ -2,6 +2,6 @@
# Makefile for the linux kernel.
#
-obj-y := entry.o platform.o
+obj-y := entry.o platform.o ctop.o
obj-$(CONFIG_SMP) += smp.o
obj-$(CONFIG_EZNPS_MTM_EXT) += mtm.o
diff --git a/arch/arc/plat-eznps/ctop.c b/arch/arc/plat-eznps/ctop.c
new file mode 100644
index 000000000000..030bcd070a1b
--- /dev/null
+++ b/arch/arc/plat-eznps/ctop.c
@@ -0,0 +1,32 @@
+/*
+ * Copyright(c) 2015 EZchip Technologies.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * The full GNU General Public License is included in this distribution in
+ * the file called "COPYING".
+ */
+
+#include <linux/sched.h>
+#include <asm/processor.h>
+#include <plat/ctop.h>
+
+void dp_save_restore(struct task_struct *prev, struct task_struct *next)
+{
+ struct eznps_dp *prev_task_dp = &prev->thread.dp;
+ struct eznps_dp *next_task_dp = &next->thread.dp;
+
+ /* Here we save all Data Plane related auxiliary registers */
+ prev_task_dp->eflags = read_aux_reg(CTOP_AUX_EFLAGS);
+ write_aux_reg(CTOP_AUX_EFLAGS, next_task_dp->eflags);
+
+ prev_task_dp->gpa1 = read_aux_reg(CTOP_AUX_GPA1);
+ write_aux_reg(CTOP_AUX_GPA1, next_task_dp->gpa1);
+}