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WDCIronportException: Internal
From:   Atish Patra <atish.patra@wdc.com>
To:     linux-kernel@vger.kernel.org
Cc:     Atish Patra <atish.patra@wdc.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        linux-riscv@lists.infradead.org,
        Palmer Dabbelt <palmer@sifive.com>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Christoph Hellwig <hch@lst.de>, Anup Patel <Anup.Patel@wdc.com>
Subject: [PATCH v4 3/3] RISC-V: Issue a tlb page flush if possible
Date:   Thu, 22 Aug 2019 00:51:51 -0700
Message-Id: <20190822075151.24838-4-atish.patra@wdc.com>
In-Reply-To: <20190822075151.24838-1-atish.patra@wdc.com>
References: <20190822075151.24838-1-atish.patra@wdc.com>
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Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

If tlbflush request is for page only, there is no need to do a
complete local tlb shootdown.

Just do a local tlb flush for the given address.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
---
 arch/riscv/mm/tlbflush.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/riscv/mm/tlbflush.c b/arch/riscv/mm/tlbflush.c
index 8172fbf46123..b1c04751bcf1 100644
--- a/arch/riscv/mm/tlbflush.c
+++ b/arch/riscv/mm/tlbflush.c
@@ -27,7 +27,10 @@ static void __sbi_tlb_flush_range(struct cpumask *cmask, unsigned long start,
 
 	if (cpumask_any_but(cmask, cpuid) >= nr_cpu_ids) {
 		/* local cpu is the only cpu present in cpumask */
-		local_flush_tlb_all();
+		if (size <= PAGE_SIZE)
+			local_flush_tlb_page(start);
+		else
+			local_flush_tlb_all();
 	} else {
 		riscv_cpuid_to_hartid_mask(cmask, &hmask);
 		sbi_remote_sfence_vma(cpumask_bits(&hmask), start, size);
-- 
2.21.0