linux-kernel - [PATCH v4 12/16] arm64/mm: Introduce a callback to set reserved bits

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Message-ID: <20210414112312.13704-13-shameerali.kolothum.thodi@huawei.com>
Date:   Wed, 14 Apr 2021 12:23:08 +0100
From:   Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>
To:     <linux-arm-kernel@...ts.infradead.org>,
        <kvmarm@...ts.cs.columbia.edu>, <linux-kernel@...r.kernel.org>
CC:     <maz@...nel.org>, <will@...nel.org>, <catalin.marinas@....com>,
        <james.morse@....com>, <julien.thierry.kdev@...il.com>,
        <suzuki.poulose@....com>, <jean-philippe@...aro.org>,
        <julien@....org>, <linuxarm@...wei.com>
Subject: [PATCH v4 12/16] arm64/mm: Introduce a callback to set reserved bits

Setting the reserved asid bits will vary depending on the actual
user of the ASID allocator. Introduce a new callback.

Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>
---
 arch/arm64/mm/context.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/mm/context.c b/arch/arm64/mm/context.c
index ee446f7535a3..e9049d14f54a 100644
--- a/arch/arm64/mm/context.c
+++ b/arch/arm64/mm/context.c
@@ -34,6 +34,8 @@ static struct asid_info
 	unsigned long		nr_pinned_asids;
 	/* Callback to locally flush the context. */
 	void			(*flush_cpu_ctxt_cb)(void);
+	/* Callback to set the list of reserved ASIDs */
+	void			(*set_reserved_bits)(struct asid_info *info);
 } asid_info;
 
 #define active_asid(info, cpu)	 (*per_cpu_ptr((info)->active, cpu))
@@ -118,7 +120,8 @@ static void flush_context(struct asid_info *info)
 	u64 asid;
 
 	/* Update the list of reserved ASIDs and the ASID bitmap. */
-	set_reserved_asid_bits(info);
+	if (info->set_reserved_bits)
+		info->set_reserved_bits(info);
 
 	for_each_possible_cpu(i) {
 		asid = atomic64_xchg_relaxed(&active_asid(info, i), 0);
@@ -508,6 +511,7 @@ static int asids_init(void)
 	info->active = &active_asids;
 	info->reserved = &reserved_asids;
 	info->flush_cpu_ctxt_cb = asid_flush_cpu_ctxt;
+	info->set_reserved_bits = set_reserved_asid_bits;
 
 	/*
 	 * We cannot call set_reserved_asid_bits() here because CPU
-- 
2.17.1