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From: Noam Camus <noamc@ezchip.com>
To: <linux-snps-arc@lists.infradead.org>
Cc: <linux-kernel@vger.kernel.org>, <cmetcalf@ezchip.com>,
	Noam Camus <noamc@ezchip.com>
Subject: [PATCH v3 15/18] ARC: [plat-eznps] Use dedicated identity auxiliary register.
Date: Tue, 1 Dec 2015 15:03:02 +0200	[thread overview]
Message-ID: <1448974985-11487-16-git-send-email-noamc@ezchip.com> (raw)
In-Reply-To: <1448974985-11487-1-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


WARNING: multiple messages have this Message-ID (diff)
From: noamc@ezchip.com (Noam Camus)
To: linux-snps-arc@lists.infradead.org
Subject: [PATCH v3 15/18] ARC: [plat-eznps] Use dedicated identity auxiliary register.
Date: Tue, 1 Dec 2015 15:03:02 +0200	[thread overview]
Message-ID: <1448974985-11487-16-git-send-email-noamc@ezchip.com> (raw)
In-Reply-To: <1448974985-11487-1-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 at 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

  parent reply	other threads:[~2015-12-01 13:09 UTC|newest]

Thread overview: 60+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-12-01 13:02 [PATCH v3 00/18] *** SUBJECT HERE *** Noam Camus
2015-12-01 13:02 ` Noam Camus
2015-12-01 13:02 ` [PATCH v3 01/18] Documentation: Add EZchip vendor to binding list Noam Camus
2015-12-01 13:02   ` Noam Camus
2015-12-04  8:07   ` Daniel Lezcano
2015-12-04  8:07     ` Daniel Lezcano
2015-12-04 11:46     ` Noam Camus
2015-12-04 11:46       ` Noam Camus
2015-12-01 13:02 ` [PATCH v3 02/18] ARC: [plat-eznps] define IPI_IRQ Noam Camus
2015-12-01 13:02   ` Noam Camus
2015-12-01 13:02 ` [PATCH v3 03/18] clocksource: Add NPS400 timers driver Noam Camus
2015-12-01 13:02   ` Noam Camus
2015-12-04  9:13   ` Daniel Lezcano
2015-12-04  9:13     ` Daniel Lezcano
2015-12-04 12:26     ` Noam Camus
2015-12-04 12:26       ` Noam Camus
2015-12-04 12:52       ` Daniel Lezcano
2015-12-04 12:52         ` Daniel Lezcano
2015-12-08 13:00     ` Noam Camus
2015-12-08 13:00       ` Noam Camus
2015-12-01 13:02 ` [PATCH v3 04/18] irqchip: add nps Internal and external irqchips Noam Camus
2015-12-01 13:02   ` Noam Camus
2015-12-01 13:29   ` Marc Zyngier
2015-12-01 13:29     ` Marc Zyngier
2015-12-02 15:08     ` Noam Camus
2015-12-02 15:08       ` Noam Camus
2015-12-03 18:33       ` Marc Zyngier
2015-12-03 18:33         ` Marc Zyngier
2015-12-07 11:19         ` Noam Camus
2015-12-07 11:19           ` Noam Camus
2015-12-11  7:58     ` Vineet Gupta
2015-12-11  7:58       ` Vineet Gupta
2015-12-01 13:02 ` [PATCH v3 05/18] ARC: Set vmalloc size from configuration Noam Camus
2015-12-01 13:02   ` Noam Camus
2015-12-01 13:02 ` [PATCH v3 06/18] ARC: rwlock: disable interrupts in !LLSC variant Noam Camus
2015-12-01 13:02   ` Noam Camus
2015-12-01 13:02 ` [PATCH v3 07/18] ARC: rename smp operation init_irq_cpu() to init_per_cpu() Noam Camus
2015-12-01 13:02   ` Noam Camus
2015-12-01 13:02 ` [PATCH v3 08/18] ARC: Mark secondary cpu online only after all HW setup is done Noam Camus
2015-12-01 13:02   ` Noam Camus
2015-12-01 13:02 ` [PATCH v3 09/18] ARC: add CONFIG_CLKSRC_OF support to time_init() Noam Camus
2015-12-01 13:02   ` Noam Camus
2015-12-01 13:02 ` [PATCH v3 10/18] ARC: [plat-eznps] Add eznps board defconfig and dts Noam Camus
2015-12-01 13:02   ` Noam Camus
2015-12-01 13:02 ` [PATCH v3 11/18] ARC: [plat-eznps] Add eznps platform Noam Camus
2015-12-01 13:02   ` Noam Camus
2015-12-01 13:02 ` [PATCH v3 12/18] ARC: [plat-eznps] Use dedicated user stack top Noam Camus
2015-12-01 13:02   ` Noam Camus
2015-12-01 13:03 ` [PATCH v3 13/18] ARC: [plat-eznps] Use dedicated atomic/bitops/cmpxchg Noam Camus
2015-12-01 13:03   ` Noam Camus
2015-12-01 13:03 ` [PATCH v3 14/18] ARC: [plat-eznps] Use dedicated SMP barriers Noam Camus
2015-12-01 13:03   ` Noam Camus
2015-12-01 13:03 ` Noam Camus [this message]
2015-12-01 13:03   ` [PATCH v3 15/18] ARC: [plat-eznps] Use dedicated identity auxiliary register Noam Camus
2015-12-01 13:03 ` [PATCH v3 16/18] ARC: [plat-eznps] Use dedicated cpu_relax() Noam Camus
2015-12-01 13:03   ` Noam Camus
2015-12-01 13:03 ` [PATCH v3 17/18] ARC: [plat-eznps] Use dedicated COMMAND_LINE_SIZE Noam Camus
2015-12-01 13:03   ` Noam Camus
2015-12-01 13:03 ` [PATCH v3 18/18] ARC: Add eznps platform to Kconfig and Makefile Noam Camus
2015-12-01 13:03   ` Noam Camus

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