From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9A58E13D244; Fri, 26 Apr 2024 12:14:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714133641; cv=none; b=Tc/ZvjntiZB0FYtJl1/e/Zx9Es/4JDb0FHdlQGYFkD1hA/nX7Ewn+NSXoayR962KyDHjB80RcHn8hqo4pHTkIENI3kel/Yff9efQUeXmUFkRDBbokPZSMYJ/9ryQnMFVkk6SE71H/pufjQGkBO0kc2jBDX4GjzO+wOPQxuNqEC4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1714133641; c=relaxed/simple; bh=DxBgaKwTefQF1Qh6WVIH65YwLhtzYLsdLbNUCj6Cxbw=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version:Content-Type; b=Y3PGll9sdcOoz7BGjkDTWGgdswzgmhTgS3Gtfl1/WStEgVrUGoywaiVHzFQAabHmhvKUmVmvxe1D8uUV2WalBuCSk9l+sNA2S4swqWFZe9BGn6pSD14+HeA7N20coq6yAq6T5hjwagN2ku/YwZKb7TdbSMHuHKCl3/0PdxeDXmM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=CEx9IEAU; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="CEx9IEAU" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C7A06C113CD; Fri, 26 Apr 2024 12:14:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1714133641; bh=DxBgaKwTefQF1Qh6WVIH65YwLhtzYLsdLbNUCj6Cxbw=; h=From:To:Cc:Subject:Date:From; b=CEx9IEAUBV834qasmxP80Ps5Z5rdkkglCPZFARjcKLNFuI1LOxyRoDg2urrmK0ZRT XKfc2jX1kM90tB19kZBbOfZo9A60tuFtns5uczMFYtDZd/8zhvJuRY35itosqgchSV RdOJ4pyx9OfgmRMy/1p/29fTr9mcPEI61SfU/K0DH+hvPlsWTtAjlEAyXYyDY1BCJh s9xIzWeMn4PGnGJ9zsJ8mbLhzsqu5YkeyZAHBgsQHZ6yL20j9TG+Z/bZbPQJVuEHOx 7uKMZoNcbFD4erfA9eI7com+3hQndmTPO8DQ6jAWIM1uMHIj7aBI084pFOhdZgVpzo 6lJsXa0U8gnyw== From: Puranjay Mohan To: Catalin Marinas , Will Deacon , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Zi Shen Lim , Xu Kuohai , Florent Revest , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org Cc: puranjay12@gmail.com Subject: [PATCH bpf-next v3 0/2] bpf, arm64: Support per-cpu instruction Date: Fri, 26 Apr 2024 12:13:47 +0000 Message-Id: <20240426121349.97651-1-puranjay@kernel.org> X-Mailer: git-send-email 2.40.1 Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Changes in v2 -> v3: v2: https://lore.kernel.org/all/20240424173550.16359-1-puranjay@kernel.org/ - Fixed the xlated dump of percpu mov to "r0 = &(void __percpu *)(r0)" - Made ARM64 and x86-64 use the same code for inlining. The only difference that remains is the per-cpu address of the cpu_number. Changes in v1 -> v2: v1: https://lore.kernel.org/all/20240405091707.66675-1-puranjay12@gmail.com/ - Add a patch to inline bpf_get_smp_processor_id() - Fix an issue in MRS instruction encoding as pointed out by Will - Remove CONFIG_SMP check because arm64 kernel always compiles with CONFIG_SMP This series adds the support of internal only per-CPU instructions and inlines the bpf_get_smp_processor_id() helper call for ARM64 BPF JIT. Here is an example of calls to bpf_get_smp_processor_id() and percpu_array_map_lookup_elem() before and after this series. BPF ===== BEFORE AFTER -------- ------- int cpu = bpf_get_smp_processor_id(); int cpu = bpf_get_smp_processor_id(); (85) call bpf_get_smp_processor_id#229032 (18) r0 = 0xffff800082072008 (bf) r0 = &(void __percpu *)(r0) (61) r0 = *(u32 *)(r0 +0) p = bpf_map_lookup_elem(map, &zero); p = bpf_map_lookup_elem(map, &zero); (18) r1 = map[id:78] (18) r1 = map[id:153] (18) r2 = map[id:82][0]+65536 (18) r2 = map[id:157][0]+65536 (85) call percpu_array_map_lookup_elem#313512 (07) r1 += 496 (61) r0 = *(u32 *)(r2 +0) (35) if r0 >= 0x1 goto pc+5 (67) r0 <<= 3 (0f) r0 += r1 (79) r0 = *(u64 *)(r0 +0) (bf) r0 = &(void __percpu *)(r0) (05) goto pc+1 (b7) r0 = 0 ARM64 JIT =========== BEFORE AFTER -------- ------- int cpu = bpf_get_smp_processor_id(); int cpu = bpf_get_smp_processor_id(); mov x10, #0xfffffffffffff4d0 mov x7, #0xffff8000ffffffff movk x10, #0x802b, lsl #16 movk x7, #0x8207, lsl #16 movk x10, #0x8000, lsl #32 movk x7, #0x2008 blr x10 mrs x10, tpidr_el1 add x7, x0, #0x0 add x7, x7, x10 ldr w7, [x7] p = bpf_map_lookup_elem(map, &zero); p = bpf_map_lookup_elem(map, &zero); mov x0, #0xffff0003ffffffff mov x0, #0xffff0003ffffffff movk x0, #0xce5c, lsl #16 movk x0, #0xe0f3, lsl #16 movk x0, #0xca00 movk x0, #0x7c00 mov x1, #0xffff8000ffffffff mov x1, #0xffff8000ffffffff movk x1, #0x8bdb, lsl #16 movk x1, #0xb0c7, lsl #16 movk x1, #0x6000 movk x1, #0xe000 mov x10, #0xffffffffffff3ed0 add x0, x0, #0x1f0 movk x10, #0x802d, lsl #16 ldr w7, [x1] movk x10, #0x8000, lsl #32 cmp x7, #0x1 blr x10 b.cs 0x0000000000000090 add x7, x0, #0x0 lsl x7, x7, #3 add x7, x7, x0 ldr x7, [x7] mrs x10, tpidr_el1 add x7, x7, x10 b 0x0000000000000094 mov x7, #0x0 Performance improvement found using benchmark[1] BEFORE AFTER -------- ------- glob-arr-inc : 23.817 ± 0.019M/s glob-arr-inc : 24.631 ± 0.027M/s arr-inc : 23.253 ± 0.019M/s arr-inc : 23.742 ± 0.023M/s hash-inc : 12.258 ± 0.010M/s hash-inc : 12.625 ± 0.004M/s [1] https://github.com/anakryiko/linux/commit/8dec900975ef Puranjay Mohan (2): arm64, bpf: add internal-only MOV instruction to resolve per-CPU addrs bpf, arm64: inline bpf_get_smp_processor_id() helper arch/arm64/include/asm/insn.h | 7 +++++++ arch/arm64/lib/insn.c | 11 +++++++++++ arch/arm64/net/bpf_jit.h | 6 ++++++ arch/arm64/net/bpf_jit_comp.c | 14 ++++++++++++++ kernel/bpf/verifier.c | 24 +++++++++++++++++------- 5 files changed, 55 insertions(+), 7 deletions(-) -- 2.40.1 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B7289C04FFE for ; Fri, 26 Apr 2024 12:14:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: 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Deacon , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Zi Shen Lim , Xu Kuohai , Florent Revest , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org Cc: puranjay12@gmail.com Subject: [PATCH bpf-next v3 0/2] bpf, arm64: Support per-cpu instruction Date: Fri, 26 Apr 2024 12:13:47 +0000 Message-Id: <20240426121349.97651-1-puranjay@kernel.org> X-Mailer: git-send-email 2.40.1 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240426_051402_892116_E105C797 X-CRM114-Status: GOOD ( 10.25 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: 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