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 7781D101F2 for ; Mon, 27 Nov 2023 11:46:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="K16ofiBr" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DC538C433C8; Mon, 27 Nov 2023 11:46:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1701085567; bh=JfhVXgGa+qpN3Vol8ICPhIgPDpPhDkgYUrHK4QQN2mU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=K16ofiBrL0ODYGo66FMYBQnbNNFkUQeZrzMFTZkdO33r3kEX/hsrWxHMKaMS+G0jK LYH2URduq4G5pV9Bm9quYnQro7+OKaOR9AjDdSczqG8dwJ81A1+NH7h/EJ5xVR/CQq KYCk7DTwcbaGpIF+12NZqL2uCHs6gQXX23+JVExoYMES/3O6zkV2Zl+/O+iWtjajJs tnQtGq9LcolBqI7NJnTr/O5eHprkpBhqJGHz4O6pFSc8fG+VcZnQ+XNcP3KVGrSb11 xjiP18uaxKWLvYRUpFC2vMCmJ368XBs6yD8DY/IzDC8CjnRyBvoxZ1yNiebH4VH7jL fxkxiqJclEOAQ== Received: from sofa.misterjones.org ([185.219.108.64] helo=valley-girl.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.95) (envelope-from ) id 1r7a3y-00GleL-0T; Mon, 27 Nov 2023 11:46:06 +0000 From: Marc Zyngier To: linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev Cc: Catalin Marinas , Will Deacon , Mark Rutland , Ard Biesheuvel , James Morse , Suzuki K Poulose , Oliver Upton , Zenghui Yu Subject: [PATCH v3 10/13] arm64: Add MIDR-based override infrastructure Date: Mon, 27 Nov 2023 11:45:56 +0000 Message-Id: <20231127114559.990314-11-maz@kernel.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20231127114559.990314-1-maz@kernel.org> References: <20231127114559.990314-1-maz@kernel.org> Precedence: bulk X-Mailing-List: kvmarm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, catalin.marinas@arm.com, will@kernel.org, mark.rutland@arm.com, ardb@kernel.org, james.morse@arm.com, suzuki.poulose@arm.com, oliver.upton@linux.dev, yuzenghui@huawei.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false In order to be able to use the override infrastructure to "fix" CPUs that have deviated from the architecture spec, add a new pile of hacks on top of the existing one, allowing a feature to be overriden based on matching a MIDR list. Reviewed-by: Suzuki K Poulose Signed-off-by: Marc Zyngier --- arch/arm64/kernel/idreg-override.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/arch/arm64/kernel/idreg-override.c b/arch/arm64/kernel/idreg-override.c index 7b5b9dc20e6b..57c145bf50b7 100644 --- a/arch/arm64/kernel/idreg-override.c +++ b/arch/arm64/kernel/idreg-override.c @@ -321,6 +321,23 @@ static __init void parse_cmdline(void) __parse_cmdline(prop, true); } +struct midr_override_data { + const char feature[FTR_ALIAS_OPTION_LEN]; + const struct midr_range ranges[]; +}; + +static const struct midr_override_data * const midr_ovr_data[] __initconst = { +}; + +static void __init apply_midr_overrides(void) +{ + const u64 midr = read_cpuid_id(); + + for (int i = 0; i < ARRAY_SIZE(midr_ovr_data); i++) + if (is_midr_in_range_list(midr, midr_ovr_data[i]->ranges)) + __parse_cmdline(midr_ovr_data[i]->feature, false); +} + /* Keep checkers quiet */ void init_feature_override(u64 boot_status); @@ -337,6 +354,8 @@ asmlinkage void __init init_feature_override(u64 boot_status) __boot_status = boot_status; + apply_midr_overrides(); + parse_cmdline(); for (i = 0; i < ARRAY_SIZE(regs); i++) { -- 2.39.2 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 BB613C4167B for ; Mon, 27 Nov 2023 11:46:51 +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=BwGdnMLZ3fTyjGkJ7mVOjLMjRvQeadTX4ob26FQFOrI=; 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SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20231127_034608_704129_585D1451 X-CRM114-Status: GOOD ( 12.98 ) 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 In order to be able to use the override infrastructure to "fix" CPUs that have deviated from the architecture spec, add a new pile of hacks on top of the existing one, allowing a feature to be overriden based on matching a MIDR list. Reviewed-by: Suzuki K Poulose Signed-off-by: Marc Zyngier --- arch/arm64/kernel/idreg-override.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/arch/arm64/kernel/idreg-override.c b/arch/arm64/kernel/idreg-override.c index 7b5b9dc20e6b..57c145bf50b7 100644 --- a/arch/arm64/kernel/idreg-override.c +++ b/arch/arm64/kernel/idreg-override.c @@ -321,6 +321,23 @@ static __init void parse_cmdline(void) __parse_cmdline(prop, true); } +struct midr_override_data { + const char feature[FTR_ALIAS_OPTION_LEN]; + const struct midr_range ranges[]; +}; + +static const struct midr_override_data * const midr_ovr_data[] __initconst = { +}; + +static void __init apply_midr_overrides(void) +{ + const u64 midr = read_cpuid_id(); + + for (int i = 0; i < ARRAY_SIZE(midr_ovr_data); i++) + if (is_midr_in_range_list(midr, midr_ovr_data[i]->ranges)) + __parse_cmdline(midr_ovr_data[i]->feature, false); +} + /* Keep checkers quiet */ void init_feature_override(u64 boot_status); @@ -337,6 +354,8 @@ asmlinkage void __init init_feature_override(u64 boot_status) __boot_status = boot_status; + apply_midr_overrides(); + parse_cmdline(); for (i = 0; i < ARRAY_SIZE(regs); i++) { -- 2.39.2 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel