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From: Frederic Weisbecker <frederic@kernel.org>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Frederic Weisbecker <frederic@kernel.org>,
	Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
	Peter Zijlstra <peterz@infradead.org>,
	"David S . Miller" <davem@davemloft.net>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Mauro Carvalho Chehab <mchehab+samsung@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	"Paul E . McKenney" <paulmck@linux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@gmail.com>,
	Pavan Kondeti <pkondeti@codeaurora.org>,
	Ingo Molnar <mingo@kernel.org>,
	Joel Fernandes <joel@joelfernandes.org>
Subject: [PATCH 20/37] softirq: Introduce disabled softirq vectors bits
Date: Thu, 28 Feb 2019 18:12:25 +0100	[thread overview]
Message-ID: <20190228171242.32144-21-frederic@kernel.org> (raw)
In-Reply-To: <20190228171242.32144-1-frederic@kernel.org>

Disabling the softirqs is currently an all-or-nothing operation: either
all softirqs are enabled or none of them. However we plan to introduce a
per vector granularity of this ability to improve latency response and
make each softirq vector interruptible by the others.

The first step carried here is to provide the necessary APIs to control
the per-vector enable bits.

Reviewed-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Cc: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Cc: Joel Fernandes <joel@joelfernandes.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Pavan Kondeti <pkondeti@codeaurora.org>
Cc: Paul E . McKenney <paulmck@linux.vnet.ibm.com>
Cc: David S . Miller <davem@davemloft.net>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
---
 arch/s390/include/asm/hardirq.h |  9 ++++--
 include/linux/interrupt.h       | 55 ++++++++++++++++++++++++++++++---
 2 files changed, 57 insertions(+), 7 deletions(-)

diff --git a/arch/s390/include/asm/hardirq.h b/arch/s390/include/asm/hardirq.h
index 54e81f520175..13c57289e7ec 100644
--- a/arch/s390/include/asm/hardirq.h
+++ b/arch/s390/include/asm/hardirq.h
@@ -13,9 +13,14 @@
 
 #include <asm/lowcore.h>
 
-#define local_softirq_pending() (S390_lowcore.softirq_data)
-#define softirq_pending_clear_mask(x) (S390_lowcore.softirq_data &= ~(x))
+#define local_softirq_data() (S390_lowcore.softirq_data)
+#define local_softirq_pending() (local_softirq_data() & SOFTIRQ_PENDING_MASK)
+#define local_softirq_enabled() (local_softirq_data() >> SOFTIRQ_ENABLED_SHIFT)
+#define softirq_enabled_set_mask(x) (S390_lowcore.softirq_data |= ((x) << SOFTIRQ_ENABLED_SHIFT))
+#define softirq_enabled_clear_mask(x) (S390_lowcore.softirq_data &= ~((x) << SOFTIRQ_ENABLED_SHIFT))
+#define softirq_enabled_set(x) (S390_lowcore.softirq_data = local_softirq_pending() | ((x) << SOFTIRQ_ENABLED_SHIFT))
 #define softirq_pending_set_mask(x)  (S390_lowcore.softirq_data |= (x))
+#define softirq_pending_clear_mask(x) (S390_lowcore.softirq_data &= ~(x))
 
 #define __ARCH_IRQ_STAT
 #define __ARCH_HAS_DO_SOFTIRQ
diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
index c402770ae45b..0c3590e4fcac 100644
--- a/include/linux/interrupt.h
+++ b/include/linux/interrupt.h
@@ -474,17 +474,62 @@ enum
 #define SOFTIRQ_STOP_IDLE_MASK (~(1 << RCU_SOFTIRQ))
 #define SOFTIRQ_ALL_MASK (BIT(NR_SOFTIRQS) - 1)
 
-#ifndef local_softirq_pending
+#define SOFTIRQ_ENABLED_SHIFT 16
+#define SOFTIRQ_PENDING_MASK (BIT(SOFTIRQ_ENABLED_SHIFT) - 1)
+
+
+#ifndef local_softirq_data
 
 #ifndef local_softirq_data_ref
 #define local_softirq_data_ref irq_stat.__softirq_data
 #endif
 
-#define local_softirq_pending()	(__this_cpu_read(local_softirq_data_ref))
-#define softirq_pending_clear_mask(x)	(__this_cpu_and(local_softirq_data_ref, ~(x)))
-#define softirq_pending_set_mask(x)	(__this_cpu_or(local_softirq_data_ref, (x)))
+static inline unsigned int local_softirq_data(void)
+{
+	return __this_cpu_read(local_softirq_data_ref);
+}
 
-#endif /* local_softirq_pending */
+static inline unsigned int local_softirq_enabled(void)
+{
+	return local_softirq_data() >> SOFTIRQ_ENABLED_SHIFT;
+}
+
+static inline unsigned int local_softirq_pending(void)
+{
+	return local_softirq_data() & SOFTIRQ_PENDING_MASK;
+}
+
+static inline void softirq_enabled_clear_mask(unsigned int enabled)
+{
+	enabled <<= SOFTIRQ_ENABLED_SHIFT;
+	__this_cpu_and(local_softirq_data_ref, ~enabled);
+}
+
+static inline void softirq_enabled_set_mask(unsigned int enabled)
+{
+	enabled <<= SOFTIRQ_ENABLED_SHIFT;
+	__this_cpu_or(local_softirq_data_ref, enabled);
+}
+
+static inline void softirq_enabled_set(unsigned int enabled)
+{
+	unsigned int data;
+
+	data = enabled << SOFTIRQ_ENABLED_SHIFT;
+	data |= local_softirq_pending();
+	__this_cpu_write(local_softirq_data_ref, data);
+}
+
+static inline void softirq_pending_clear_mask(unsigned int pending)
+{
+	__this_cpu_and(local_softirq_data_ref, ~pending);
+}
+
+static inline void softirq_pending_set_mask(unsigned int pending)
+{
+	__this_cpu_or(local_softirq_data_ref, pending);
+}
+#endif /* local_softirq_data */
 
 /* map softirq index to softirq name. update 'softirq_to_name' in
  * kernel/softirq.c when adding a new softirq.
-- 
2.21.0


  parent reply	other threads:[~2019-02-28 17:14 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-02-28 17:12 [PATCH 00/37] softirq: Per vector masking v3 Frederic Weisbecker
2019-02-28 17:12 ` [PATCH 01/37] locking/lockdep: Move valid_state() inside CONFIG_TRACE_IRQFLAGS && CONFIG_PROVE_LOCKING Frederic Weisbecker
2019-02-28 17:12 ` [PATCH 02/37] locking/lockdep: Use expanded masks on find_usage_*() functions Frederic Weisbecker
2019-02-28 17:12 ` [PATCH 03/37] locking/lockdep: Introduce struct lock_usage Frederic Weisbecker
2019-02-28 17:12 ` [PATCH 04/37] locking/lockdep: Convert usage_mask to u64 Frederic Weisbecker
2019-02-28 17:12 ` [PATCH 05/37] locking/lockdep: Introduce lock usage mask iterator Frederic Weisbecker
2019-02-28 17:12 ` [PATCH 06/37] locking/lockdep: Test all incompatible scenario at once in check_irq_usage() Frederic Weisbecker
2019-02-28 17:12 ` [PATCH 07/37] locking/lockdep: Prepare valid_state() to handle plain masks Frederic Weisbecker
2019-02-28 17:12 ` [PATCH 08/37] locking/lockdep: Prepare check_usage_*() " Frederic Weisbecker
2019-02-28 17:12 ` [PATCH 09/37] locking/lockdep: Prepare state_verbose() to handle all softirqs Frederic Weisbecker
2019-02-28 17:12 ` [PATCH 10/37] locking/lockdep: Make mark_lock() fastpath to work with multiple usage at once Frederic Weisbecker
2019-02-28 17:12 ` [PATCH 11/37] locking/lockdep: Save stack trace for each softirq vector involved Frederic Weisbecker
2019-02-28 17:12 ` [PATCH 12/37] locking/lockdep: Report all usages on mark_lock() verbosity mode Frederic Weisbecker
2019-02-28 17:12 ` [PATCH 13/37] softirq: Macrofy softirq vectors Frederic Weisbecker
2019-02-28 17:12 ` [PATCH 14/37] locking/lockdep: Define per vector softirq lock usage states Frederic Weisbecker
2019-04-09 12:03   ` Peter Zijlstra
2019-02-28 17:12 ` [PATCH 15/37] softirq: Pass softirq vector number to lockdep on vector execution Frederic Weisbecker
2019-02-28 17:12 ` [PATCH 16/37] x86: Revert "x86/irq: Demote irq_cpustat_t::__softirq_pending to u16" Frederic Weisbecker
2019-02-28 17:12 ` [PATCH 17/37] arch/softirq: Rename softirq_pending fields to softirq_data Frederic Weisbecker
2019-02-28 17:12 ` [PATCH 18/37] softirq: Normalize softirq_pending naming scheme Frederic Weisbecker
2019-02-28 17:12 ` [PATCH 19/37] softirq: Convert softirq_pending_*() to set/clear mask scheme Frederic Weisbecker
2019-02-28 17:12 ` Frederic Weisbecker [this message]
2019-03-01 11:29   ` [PATCH 20/37] softirq: Introduce disabled softirq vectors bits Sebastian Andrzej Siewior
2019-02-28 17:12 ` [PATCH 21/37] softirq: Rename _local_bh_enable() to local_bh_enable_no_softirq() Frederic Weisbecker
2019-02-28 17:12 ` [PATCH 22/37] softirq: Move vectors bits to bottom_half.h Frederic Weisbecker
2019-02-28 17:12 ` [PATCH 23/37] x86: Init softirq enabled field Frederic Weisbecker
2019-02-28 17:12 ` [PATCH 24/37] parisc: " Frederic Weisbecker
2019-02-28 17:12 ` [PATCH 25/37] powerpc: " Frederic Weisbecker
2019-02-28 17:12 ` [PATCH 26/37] softirq: Init softirq enabled field for default irq_stat definition Frederic Weisbecker
2019-02-28 17:12 ` [PATCH 27/37] softirq: Check enabled vectors before processing Frederic Weisbecker
2019-02-28 17:12 ` [PATCH 28/37] softirq: Remove stale comment Frederic Weisbecker
2019-02-28 17:12 ` [PATCH 29/37] softirq: Uninline !CONFIG_TRACE_IRQFLAGS __local_bh_disable_ip() Frederic Weisbecker
2019-02-28 17:12 ` [PATCH 30/37] softirq: Prepare for mixing all/per-vector masking Frederic Weisbecker
2019-02-28 17:12 ` [PATCH 31/37] softirq: Support per vector masking Frederic Weisbecker
2019-02-28 17:12 ` [PATCH 32/37] locking/lockdep: Remove redundant softirqs on check Frederic Weisbecker
2019-02-28 17:12 ` [PATCH 33/37] locking/lockdep: Update check_flags() according to new layout Frederic Weisbecker
2019-02-28 17:12 ` [PATCH 34/37] locking/lockdep: Branch the new vec-finegrained softirq masking to lockdep Frederic Weisbecker
2019-02-28 17:12 ` [PATCH 35/37] softirq: Allow to soft interrupt vector-specific masked contexts Frederic Weisbecker
2019-02-28 17:12 ` [PATCH 36/37] locking: Introduce spin_[un]lock_bh_mask() Frederic Weisbecker
2019-02-28 17:12 ` [PATCH 37/37] net: Make softirq vector masking finegrained on release_sock() Frederic Weisbecker
2019-02-28 17:33 ` [PATCH 00/37] softirq: Per vector masking v3 Linus Torvalds
2019-03-01  3:45   ` Frederic Weisbecker
2019-03-01 16:51     ` Linus Torvalds
2019-03-08 15:30       ` Frederic Weisbecker

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