From: Noam Camus <noamc@ezchip.com>
To: <linux-snps-arc@lists.infradead.org>
Cc: <linux-kernel@vger.kernel.org>, <cmetcalf@ezchip.com>,
<daniel.lezcano@linaro.org>, Noam Camus <noamc@ezchip.com>
Subject: [PATCH v4 16/19] ARC: [plat-eznps] Use dedicated identity auxiliary register.
Date: Wed, 16 Dec 2015 03:10:35 +0200 [thread overview]
Message-ID: <1450228238-4499-17-git-send-email-noamc@ezchip.com> (raw)
In-Reply-To: <1450228238-4499-1-git-send-email-noamc@ezchip.com>
From: Noam Camus <noamc@ezchip.com>
With generic "identity" num of CPUs is limited to 256 (8 bit).
We use our alternative AUX register GLOBAL_ID (12 bit).
Now we can support up to 4096 CPUs.
Signed-off-by: Noam Camus <noamc@ezchip.com>
---
arch/arc/include/asm/entry-compact.h | 8 ++++++++
arch/arc/kernel/ctx_sw.c | 13 +++++++++++++
2 files changed, 21 insertions(+), 0 deletions(-)
diff --git a/arch/arc/include/asm/entry-compact.h b/arch/arc/include/asm/entry-compact.h
index 1aff3be..bf9a6a1 100644
--- a/arch/arc/include/asm/entry-compact.h
+++ b/arch/arc/include/asm/entry-compact.h
@@ -35,6 +35,7 @@
#include <asm/asm-offsets.h>
#include <asm/irqflags-compact.h>
#include <asm/thread_info.h> /* For THREAD_SIZE */
+#include <plat/ctop.h>
/*--------------------------------------------------------------
* Switch to Kernel Mode stack if SP points to User Mode stack
@@ -298,9 +299,16 @@
/* Get CPU-ID of this core */
.macro GET_CPU_ID reg
+#ifdef CONFIG_ARC_PLAT_EZNPS
+ lr \reg, [CTOP_AUX_LOGIC_GLOBAL_ID]
+#ifndef CONFIG_EZNPS_MTM_EXT
+ lsr \reg, \reg, 4
+#endif
+#else
lr \reg, [identity]
lsr \reg, \reg, 8
bmsk \reg, \reg, 7
+#endif
.endm
#endif /* __ASM_ARC_ENTRY_COMPACT_H */
diff --git a/arch/arc/kernel/ctx_sw.c b/arch/arc/kernel/ctx_sw.c
index 5d446df..6f4cb0d 100644
--- a/arch/arc/kernel/ctx_sw.c
+++ b/arch/arc/kernel/ctx_sw.c
@@ -16,6 +16,9 @@
#include <asm/asm-offsets.h>
#include <linux/sched.h>
+#ifdef CONFIG_ARC_PLAT_EZNPS
+#include <plat/ctop.h>
+#endif
#define KSP_WORD_OFF ((TASK_THREAD + THREAD_KSP) / 4)
@@ -67,9 +70,16 @@ __switch_to(struct task_struct *prev_task, struct task_struct *next_task)
#ifndef CONFIG_SMP
"st %2, [@_current_task] \n\t"
#else
+#ifdef CONFIG_ARC_PLAT_EZNPS
+ "lr r24, [%4] \n\t"
+#ifndef CONFIG_EZNPS_MTM_EXT
+ "lsr r24, r24, 4 \n\t"
+#endif
+#else
"lr r24, [identity] \n\t"
"lsr r24, r24, 8 \n\t"
"bmsk r24, r24, 7 \n\t"
+#endif
"add2 r24, @_current_task, r24 \n\t"
"st %2, [r24] \n\t"
#endif
@@ -107,6 +117,9 @@ __switch_to(struct task_struct *prev_task, struct task_struct *next_task)
: "=r"(tmp)
: "n"(KSP_WORD_OFF), "r"(next), "r"(prev)
+#ifdef CONFIG_ARC_PLAT_EZNPS
+ , "i"(CTOP_AUX_LOGIC_GLOBAL_ID)
+#endif
: "blink"
);
--
1.7.1
next prev parent reply other threads:[~2015-12-16 1:16 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-16 1:10 [PATCH v4 00/19] Adding plat-eznps to ARC Noam Camus
2015-12-16 1:10 ` [PATCH v4 01/19] Documentation: Add EZchip vendor to binding list Noam Camus
2015-12-16 1:10 ` [PATCH v4 02/19] soc: Support for EZchip SoC Noam Camus
2015-12-16 1:10 ` [PATCH v4 03/19] ARC: [plat-eznps] define IPI_IRQ Noam Camus
2015-12-16 1:10 ` [PATCH v4 04/19] clocksource: Add NPS400 timers driver Noam Camus
2015-12-17 13:12 ` Daniel Lezcano
2015-12-16 1:10 ` [PATCH v4 05/19] irqchip: add nps Internal and external irqchips Noam Camus
2015-12-16 9:30 ` Marc Zyngier
2015-12-18 10:37 ` Noam Camus
2015-12-18 11:21 ` Marc Zyngier
2015-12-18 14:29 ` Noam Camus
2015-12-18 16:31 ` Marc Zyngier
2015-12-19 9:30 ` Noam Camus
2015-12-30 11:35 ` Vineet Gupta
2016-01-12 7:00 ` Vineet Gupta
2016-01-12 8:48 ` Marc Zyngier
2016-01-12 9:12 ` Vineet Gupta
2016-01-12 9:28 ` Marc Zyngier
2016-01-25 13:08 ` Vineet Gupta
2016-01-29 16:37 ` Noam Camus
2015-12-16 1:10 ` [PATCH v4 06/19] ARC: Set vmalloc size from configuration Noam Camus
2015-12-16 1:10 ` [PATCH v4 07/19] ARC: rwlock: disable interrupts in !LLSC variant Noam Camus
2015-12-16 1:10 ` [PATCH v4 08/19] ARC: rename smp operation init_irq_cpu() to init_per_cpu() Noam Camus
2015-12-16 1:10 ` [PATCH v4 09/19] ARC: Mark secondary cpu online only after all HW setup is done Noam Camus
2015-12-16 1:10 ` [PATCH v4 10/19] ARC: Add clock from device tree to time_init() Noam Camus
2015-12-16 1:10 ` [PATCH v4 11/19] ARC: [plat-eznps] Add eznps board defconfig and dts Noam Camus
2015-12-16 1:10 ` [PATCH v4 12/19] ARC: [plat-eznps] Add eznps platform Noam Camus
2015-12-16 1:10 ` [PATCH v4 13/19] ARC: [plat-eznps] Use dedicated user stack top Noam Camus
2015-12-16 1:10 ` [PATCH v4 14/19] ARC: [plat-eznps] Use dedicated atomic/bitops/cmpxchg Noam Camus
2015-12-16 1:10 ` [PATCH v4 15/19] ARC: [plat-eznps] Use dedicated SMP barriers Noam Camus
2015-12-16 1:10 ` Noam Camus [this message]
2015-12-16 1:10 ` [PATCH v4 17/19] ARC: [plat-eznps] Use dedicated cpu_relax() Noam Camus
2015-12-16 1:10 ` [PATCH v4 18/19] ARC: [plat-eznps] Use dedicated COMMAND_LINE_SIZE Noam Camus
2015-12-16 1:10 ` [PATCH v4 19/19] ARC: Add eznps platform to Kconfig and Makefile Noam Camus
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