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Date: Fri, 9 Aug 2019 18:43:09 -0700 Message-Id: <20190810014309.20838-1-atish.patra@wdc.com> X-Mailer: git-send-email 2.21.0 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190809_184317_400676_BA58D79D X-CRM114-Status: GOOD ( 10.45 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Albert Ou , Alexios Zavras , Greg Kroah-Hartman , Palmer Dabbelt , Atish Patra , Anup Patel , Paul Walmsley , linux-riscv@lists.infradead.org, Allison Randal Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+infradead-linux-riscv=archiver.kernel.org@lists.infradead.org In RISC-V, tlb flush happens via SBI which is expensive. If the target cpumask contains a local hartid, some cost can be saved by issuing a local tlb flush as we do that in OpenSBI anyways. Signed-off-by: Atish Patra --- arch/riscv/include/asm/tlbflush.h | 33 +++++++++++++++++++++++++++---- 1 file changed, 29 insertions(+), 4 deletions(-) diff --git a/arch/riscv/include/asm/tlbflush.h b/arch/riscv/include/asm/tlbflush.h index 687dd19735a7..b32ba4fa5888 100644 --- a/arch/riscv/include/asm/tlbflush.h +++ b/arch/riscv/include/asm/tlbflush.h @@ -8,6 +8,7 @@ #define _ASM_RISCV_TLBFLUSH_H #include +#include #include /* @@ -46,14 +47,38 @@ static inline void remote_sfence_vma(struct cpumask *cmask, unsigned long start, unsigned long size) { struct cpumask hmask; + struct cpumask tmask; + int cpuid = smp_processor_id(); cpumask_clear(&hmask); - riscv_cpuid_to_hartid_mask(cmask, &hmask); - sbi_remote_sfence_vma(hmask.bits, start, size); + cpumask_clear(&tmask); + + if (cmask) + cpumask_copy(&tmask, cmask); + else + cpumask_copy(&tmask, cpu_online_mask); + + if (cpumask_test_cpu(cpuid, &tmask)) { + /* Save trap cost by issuing a local tlb flush here */ + if ((start == 0 && size == -1) || (size > PAGE_SIZE)) + local_flush_tlb_all(); + else if (size == PAGE_SIZE) + local_flush_tlb_page(start); + cpumask_clear_cpu(cpuid, &tmask); + } else if (cpumask_empty(&tmask)) { + /* cpumask is empty. So just do a local flush */ + local_flush_tlb_all(); + return; + } + + if (!cpumask_empty(&tmask)) { + riscv_cpuid_to_hartid_mask(&tmask, &hmask); + sbi_remote_sfence_vma(hmask.bits, start, size); + } } -#define flush_tlb_all() sbi_remote_sfence_vma(NULL, 0, -1) -#define flush_tlb_page(vma, addr) flush_tlb_range(vma, addr, 0) +#define flush_tlb_all() remote_sfence_vma(NULL, 0, -1) +#define flush_tlb_page(vma, addr) flush_tlb_range(vma, addr, (addr) + PAGE_SIZE) #define flush_tlb_range(vma, start, end) \ remote_sfence_vma(mm_cpumask((vma)->vm_mm), start, (end) - (start)) #define flush_tlb_mm(mm) \ -- 2.21.0 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv