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From: Julien Grall <julien.grall@arm.com>
To: linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	kvmarm@lists.cs.columbia.edu
Cc: marc.zyngier@arm.com, catalin.marinas@arm.com,
	will.deacon@arm.com, Julien Grall <julien.gralL@arm.com>
Subject: [PATCH RFC 04/14] arm64/mm: Move the variable lock and tlb_flush_pending to asid_info
Date: Thu, 21 Mar 2019 16:36:13 +0000
Message-ID: <20190321163623.20219-5-julien.grall@arm.com> (raw)
In-Reply-To: <20190321163623.20219-1-julien.grall@arm.com>

The variables lock and tlb_flush_pending holds information for a given
ASID allocator. So move them to the asid_info structure.

Signed-off-by: Julien Grall <julien.gralL@arm.com>
---
 arch/arm64/mm/context.c | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/arch/arm64/mm/context.c b/arch/arm64/mm/context.c
index da17ed6c7117..e98ab348b9cb 100644
--- a/arch/arm64/mm/context.c
+++ b/arch/arm64/mm/context.c
@@ -27,8 +27,6 @@
 #include <asm/smp.h>
 #include <asm/tlbflush.h>
 
-static DEFINE_RAW_SPINLOCK(cpu_asid_lock);
-
 struct asid_info
 {
 	atomic64_t	generation;
@@ -36,6 +34,9 @@ struct asid_info
 	atomic64_t __percpu	*active;
 	u64 __percpu		*reserved;
 	u32			bits;
+	raw_spinlock_t		lock;
+	/* Which CPU requires context flush on next call */
+	cpumask_t		flush_pending;
 } asid_info;
 
 #define active_asid(info, cpu)	*per_cpu_ptr((info)->active, cpu)
@@ -44,8 +45,6 @@ struct asid_info
 static DEFINE_PER_CPU(atomic64_t, active_asids);
 static DEFINE_PER_CPU(u64, reserved_asids);
 
-static cpumask_t tlb_flush_pending;
-
 #define ASID_MASK(info)			(~GENMASK((info)->bits - 1, 0))
 #define ASID_FIRST_VERSION(info)	(1UL << ((info)->bits))
 
@@ -124,7 +123,7 @@ static void flush_context(struct asid_info *info)
 	 * Queue a TLB invalidation for each CPU to perform on next
 	 * context-switch
 	 */
-	cpumask_setall(&tlb_flush_pending);
+	cpumask_setall(&info->flush_pending);
 }
 
 static bool check_update_reserved_asid(struct asid_info *info, u64 asid,
@@ -233,7 +232,7 @@ void check_and_switch_context(struct mm_struct *mm, unsigned int cpu)
 				     old_active_asid, asid))
 		goto switch_mm_fastpath;
 
-	raw_spin_lock_irqsave(&cpu_asid_lock, flags);
+	raw_spin_lock_irqsave(&info->lock, flags);
 	/* Check that our ASID belongs to the current generation. */
 	asid = atomic64_read(&mm->context.id);
 	if ((asid ^ atomic64_read(&info->generation)) >> info->bits) {
@@ -241,11 +240,11 @@ void check_and_switch_context(struct mm_struct *mm, unsigned int cpu)
 		atomic64_set(&mm->context.id, asid);
 	}
 
-	if (cpumask_test_and_clear_cpu(cpu, &tlb_flush_pending))
+	if (cpumask_test_and_clear_cpu(cpu, &info->flush_pending))
 		local_flush_tlb_all();
 
 	atomic64_set(&active_asid(info, cpu), asid);
-	raw_spin_unlock_irqrestore(&cpu_asid_lock, flags);
+	raw_spin_unlock_irqrestore(&info->lock, flags);
 
 switch_mm_fastpath:
 
@@ -288,6 +287,8 @@ static int asids_init(void)
 	info->active = &active_asids;
 	info->reserved = &reserved_asids;
 
+	raw_spin_lock_init(&info->lock);
+
 	pr_info("ASID allocator initialised with %lu entries\n",
 		NUM_USER_ASIDS(info));
 	return 0;
-- 
2.11.0

  parent reply index

Thread overview: 56+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-21 16:36 [PATCH RFC 00/14] kvm/arm: Align the VMID allocation with the arm64 ASID one Julien Grall
2019-03-21 16:36 ` [PATCH RFC 01/14] arm64/mm: Introduce asid_info structure and move asid_generation/asid_map to it Julien Grall
2019-03-21 17:03   ` Suzuki K Poulose
2019-03-21 17:27     ` Julien Grall
2019-03-21 16:36 ` [PATCH RFC 02/14] arm64/mm: Move active_asids and reserved_asids to asid_info Julien Grall
2019-03-21 16:36 ` [PATCH RFC 03/14] arm64/mm: Move bits " Julien Grall
2019-03-21 16:36 ` Julien Grall [this message]
2019-03-21 16:36 ` [PATCH RFC 05/14] arm64/mm: Remove dependency on MM in new_context Julien Grall
2019-03-21 16:36 ` [PATCH RFC 06/14] arm64/mm: Store the number of asid allocated per context Julien Grall
2019-03-21 16:36 ` [PATCH RFC 07/14] arm64/mm: Introduce NUM_ASIDS Julien Grall
2019-03-21 16:36 ` [PATCH RFC 08/14] arm64/mm: Split asid_inits in 2 parts Julien Grall
2019-03-21 16:36 ` [PATCH RFC 09/14] arm64/mm: Split the function check_and_switch_context in 3 parts Julien Grall
2019-03-21 16:36 ` [PATCH RFC 10/14] arm64/mm: Introduce a callback to flush the local context Julien Grall
2019-03-21 16:36 ` [PATCH RFC 11/14] arm64: Move the ASID allocator code in a separate file Julien Grall
2019-06-05 16:56   ` Julien Grall
2019-06-05 20:41     ` Palmer Dabbelt
2019-06-11  1:56       ` Gary Guo
2019-06-19  8:07     ` Guo Ren
2019-06-19  8:54       ` Julien Grall
2019-06-19  9:12         ` Will Deacon
2019-06-19 12:18           ` Guo Ren
2019-06-19 12:39             ` Will Deacon
2019-06-20  9:33               ` Guo Ren
2019-06-24 10:40                 ` Will Deacon
2019-06-25  7:25                   ` Palmer Dabbelt
2019-09-07 23:52                   ` Guo Ren
2019-09-12 14:02                     ` Will Deacon
2019-09-12 14:59                       ` Guo Ren
2019-09-13  7:13                         ` Guo Ren
2019-09-14  8:49                           ` Guo Ren
2019-09-16 12:57                           ` Jean-Philippe Brucker
2019-09-19 13:07                             ` Guo Ren
2019-09-19 15:18                               ` Jean-Philippe Brucker
2019-09-20  0:07                                 ` Guo Ren
2019-09-20  7:18                                   ` Jean-Philippe Brucker
2019-09-14 14:01                       ` Palmer Dabbelt
2019-09-15  5:03                         ` Anup Patel
2019-09-16 18:18                           ` Will Deacon
2019-09-16 18:28                             ` Palmer Dabbelt
2019-09-17  3:42                             ` Anup Patel
2019-09-19 13:36                               ` Guo Ren
2019-06-19 11:51         ` Guo Ren
2019-06-19 12:52           ` Julien Grall
2019-06-21 14:16           ` Catalin Marinas
2019-06-23 16:35             ` Guo Ren
2019-06-24 10:22               ` Will Deacon
2019-06-27  9:41                 ` qi.fuli
2019-06-27 10:26                   ` Will Deacon
2019-06-24 15:38               ` Catalin Marinas
2019-06-30  4:29                 ` Guo Ren
2019-07-01  9:17                   ` Catalin Marinas
2019-07-16  3:31                     ` Guo Ren
2019-07-22 16:38                       ` Catalin Marinas
2019-03-21 16:36 ` [PATCH RFC 12/14] arm64/lib: asid: Allow user to update the context under the lock Julien Grall
2019-03-21 16:36 ` [PATCH RFC 13/14] arm/kvm: Introduce a new VMID allocator Julien Grall
2019-03-21 16:36 ` [PATCH RFC 14/14] kvm/arm: Align the VMID allocation with the arm64 ASID one Julien Grall

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