linux-kernel - [RFC PATCH v1 2/4] riscv: mm: Introduce percpu tlb flush queue

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Message-ID: <20251030135652.63837-3-luxu.kernel@bytedance.com>
Date: Thu, 30 Oct 2025 21:56:50 +0800
From: Xu Lu <luxu.kernel@...edance.com>
To: pjw@...nel.org,
	palmer@...belt.com,
	aou@...s.berkeley.edu,
	alex@...ti.fr,
	apatel@...tanamicro.com,
	guoren@...nel.org
Cc: linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Xu Lu <luxu.kernel@...edance.com>
Subject: [RFC PATCH v1 2/4] riscv: mm: Introduce percpu tlb flush queue

The percpu tlb flush queue is used to buffer the tlb flush tasks that
each cpu needs to process.

Signed-off-by: Xu Lu <luxu.kernel@...edance.com>
---
 arch/riscv/mm/tlbflush.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/arch/riscv/mm/tlbflush.c b/arch/riscv/mm/tlbflush.c
index 8404530ec00f9..aa8f1304ae5c4 100644
--- a/arch/riscv/mm/tlbflush.c
+++ b/arch/riscv/mm/tlbflush.c
@@ -103,6 +103,18 @@ struct flush_tlb_range_data {
 	unsigned long stride;
 };
 
+#define TLB_FLUSH_QUEUE_SIZE					16
+struct tlb_flush_queue {
+	struct flush_tlb_range_data tasks[TLB_FLUSH_QUEUE_SIZE];
+	raw_spinlock_t lock;
+	unsigned int len;
+};
+
+DEFINE_PER_CPU(struct tlb_flush_queue, tlb_flush_queue) = {
+	.lock = __RAW_SPIN_LOCK_UNLOCKED(tlb_flush_queue.lock),
+	.len = 0,
+};
+
 static void __ipi_flush_tlb_range_asid(void *info)
 {
 	struct flush_tlb_range_data *d = info;
-- 
2.20.1