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 3BC3DC27C5E for ; Mon, 10 Jun 2024 20:49:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=dZXTdPRnGHSUZ4XlSK39Bsh1q2Rrf1DKTxXLrQFrAgA=; b=pzThAMYK7De4LK ch2LweXe8PK9XoL9gUEQgs9cV63dwly4goLEy5D+JKruHiZpUHbkvwxlW5rieSlAgIsu8pwYmrpra XVq1eEBzwVozTd2RL9DMPqIoh7zUEzpC9Gcs1YCJduAxm+wB5OXG5xNnHl2+rkNH587sgi2X4GagL u0ULxh/NRuf359z9zIbGi0TQl5F5Sk+/5TjGZPnOa8OT3gLIfbCRKZOeUZXcBGUjekD+U+WD+YFDZ 3RB6J4FaGDd/5MRggvaLD46T6lSeo6UdKw6W9uLdjbLPnRtgEAgWvdNqnL2PBILGrJ1Bkhx5rGnMS MNQ0X+bZktyaaS/KmBBg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sGlws-00000006R71-0zin; Mon, 10 Jun 2024 20:49:02 +0000 Received: from dfw.source.kernel.org ([139.178.84.217]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sGlwj-00000006R0F-2X45 for linux-arm-kernel@lists.infradead.org; Mon, 10 Jun 2024 20:48:55 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id DD87C60C2D; Mon, 10 Jun 2024 20:48:52 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6F8FAC4AF1C; Mon, 10 Jun 2024 20:48:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1718052532; bh=7f3f228SGMKS0WITa2x2BowrmDUER/1fLEQ+DyBwzuw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=YPwqi78XF8g+oefGjk6SWIu9gETbsXAcfc1xuXxesUVODbHxG6F+Ihl/hQS8A6wHG h+h5f5IcE9LJ94AoyVcNT9TRaIM1jZTVmlB+cNNR9Ws/oUpeqTbhAiEgblNqzvHmGB V1scnDa858xxUlqxCoLdiKtjB+7xyFKKBoIeCoB0= From: Linus Torvalds To: Peter Anvin , Ingo Molnar , Borislav Petkov , Thomas Gleixner , Rasmus Villemoes , Josh Poimboeuf , Catalin Marinas , Will Deacon Cc: Linux Kernel Mailing List , the arch/x86 maintainers , linux-arm-kernel@lists.infradead.org, linux-arch , Linus Torvalds Subject: [PATCH 4/7] arm64: add 'runtime constant' support Date: Mon, 10 Jun 2024 13:48:18 -0700 Message-ID: <20240610204821.230388-5-torvalds@linux-foundation.org> X-Mailer: git-send-email 2.45.1.209.gc6f12300df In-Reply-To: <20240610204821.230388-1-torvalds@linux-foundation.org> References: <20240610204821.230388-1-torvalds@linux-foundation.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240610_134853_835921_925FDC18 X-CRM114-Status: GOOD ( 15.82 ) 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="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org This implements the runtime constant infrastructure for arm64, allowing the dcache d_hash() function to be generated using as a constant for hash table address followed by shift by a constant of the hash index. Signed-off-by: Linus Torvalds --- arch/arm64/include/asm/runtime-const.h | 75 ++++++++++++++++++++++++++ arch/arm64/kernel/vmlinux.lds.S | 3 ++ 2 files changed, 78 insertions(+) create mode 100644 arch/arm64/include/asm/runtime-const.h diff --git a/arch/arm64/include/asm/runtime-const.h b/arch/arm64/include/asm/runtime-const.h new file mode 100644 index 000000000000..02462b2cb6f9 --- /dev/null +++ b/arch/arm64/include/asm/runtime-const.h @@ -0,0 +1,75 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_RUNTIME_CONST_H +#define _ASM_RUNTIME_CONST_H + +#define runtime_const_ptr(sym) ({ \ + typeof(sym) __ret; \ + asm_inline("1:\t" \ + "movz %0, #0xcdef\n\t" \ + "movk %0, #0x89ab, lsl #16\n\t" \ + "movk %0, #0x4567, lsl #32\n\t" \ + "movk %0, #0x0123, lsl #48\n\t" \ + ".pushsection runtime_ptr_" #sym ",\"a\"\n\t" \ + ".long 1b - .\n\t" \ + ".popsection" \ + :"=r" (__ret)); \ + __ret; }) + +#define runtime_const_shift_right_32(val, sym) ({ \ + unsigned long __ret; \ + asm_inline("1:\t" \ + "lsr %w0,%w1,#12\n\t" \ + ".pushsection runtime_shift_" #sym ",\"a\"\n\t" \ + ".long 1b - .\n\t" \ + ".popsection" \ + :"=r" (__ret) \ + :"r" (0u+(val))); \ + __ret; }) + +#define runtime_const_init(type, sym) do { \ + extern s32 __start_runtime_##type##_##sym[]; \ + extern s32 __stop_runtime_##type##_##sym[]; \ + runtime_const_fixup(__runtime_fixup_##type, \ + (unsigned long)(sym), \ + __start_runtime_##type##_##sym, \ + __stop_runtime_##type##_##sym); \ +} while (0) + +// 16-bit immediate for wide move (movz and movk) in bits 5..20 +static inline void __runtime_fixup_16(unsigned int *p, unsigned int val) +{ + unsigned int insn = *p; + insn &= 0xffe0001f; + insn |= (val & 0xffff) << 5; + *p = insn; +} + +static inline void __runtime_fixup_ptr(void *where, unsigned long val) +{ + unsigned int *p = lm_alias(where); + __runtime_fixup_16(p, val); + __runtime_fixup_16(p+1, val >> 16); + __runtime_fixup_16(p+2, val >> 32); + __runtime_fixup_16(p+3, val >> 48); +} + +// Immediate value is 5 bits starting at bit #16 +static inline void __runtime_fixup_shift(void *where, unsigned long val) +{ + unsigned int *p = lm_alias(where); + unsigned int insn = *p; + insn &= 0xffc0ffff; + insn |= (val & 63) << 16; + *p = insn; +} + +static inline void runtime_const_fixup(void (*fn)(void *, unsigned long), + unsigned long val, s32 *start, s32 *end) +{ + while (start < end) { + fn(*start + (void *)start, val); + start++; + } +} + +#endif diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S index 755a22d4f840..55a8e310ea12 100644 --- a/arch/arm64/kernel/vmlinux.lds.S +++ b/arch/arm64/kernel/vmlinux.lds.S @@ -264,6 +264,9 @@ SECTIONS EXIT_DATA } + RUNTIME_CONST(shift, d_hash_shift) + RUNTIME_CONST(ptr, dentry_hashtable) + PERCPU_SECTION(L1_CACHE_BYTES) HYPERVISOR_PERCPU_SECTION -- 2.45.1.209.gc6f12300df _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel