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 39515CD3445 for ; Fri, 8 May 2026 16:35:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=kOBJnU9jbkauv/+GVkn9va7fbggeFPdEk5n1cVkJ1YM=; b=BNAICRCJ2qQCJZUztyfK6LLUyL KcBI2axdBYoygYEouOmroBEooBZk4GvO1exYKumhXxRNNmB/XAXIGWx0vyLnYGA+0fyLVB3ulzCnP 1qhx5VhtFZtIo0mOSGwasuyF2TDL6Qf2PYL7JnRfII9nUf9Tj3zso1/deZtq6FlPzRyqg8sFEmPQP yggShtv33HiUF6qLVUNjRgHibf48k1kzzVXCs9yjis9oS3+iIK83UUb0h8TOqcYFzEexhzQFH1ANH 8zbl5+pPcoJLUiq1jl7ZqCUM283eoZHo6Fa1vrqurJ3yC31Dicd2SN7aBVvKERTomXqCNZpLAo4Tf 0j7ma/ng==; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260508_093527_909606_825076CF X-CRM114-Status: GOOD ( 18.19 ) 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi James, On 5/8/26 17:23, James Morse wrote: > From: Zeng Heng > > In addition to updating the CPU MPAM version check, the MPAM MSC version > check also need to be updated. mpam_msc_check_aidr() is added to check > the MSC AIDR register, ensuring that both the major and minor version > numbers fall within the supported range of the MPAM architecture version. > > Signed-off-by: Zeng Heng > [ morse: changed mpam_msc_check_aidr() to accept versions like v1.2 ] > Signed-off-by: James Morse > --- > drivers/resctrl/mpam_devices.c | 23 ++++++++++++++++++++--- > 1 file changed, 20 insertions(+), 3 deletions(-) > > diff --git a/drivers/resctrl/mpam_devices.c b/drivers/resctrl/mpam_devices.c > index 916d8fd45ed5..1771e9712ca2 100644 > --- a/drivers/resctrl/mpam_devices.c > +++ b/drivers/resctrl/mpam_devices.c > @@ -224,6 +224,24 @@ static inline void _mpam_write_monsel_reg(struct mpam_msc *msc, u16 reg, u32 val > > #define mpam_write_monsel_reg(msc, reg, val) _mpam_write_monsel_reg(msc, MSMON_##reg, val) > > +static bool mpam_msc_check_aidr(struct mpam_msc *msc) > +{ > + u32 aidr = __mpam_read_reg(msc, MPAMF_AIDR); > + u32 major = FIELD_GET(MPAMF_AIDR_ARCH_MAJOR_REV, aidr); > + u32 minor = FIELD_GET(MPAMF_AIDR_ARCH_MINOR_REV, aidr); > + > + /* > + * v0.0 and >v2.x aren't supported, but anything else should be backward > + * compatible to v0.1 or v1.0. > + */ > + if (!major && !minor) > + return false; > + if (major > 1) > + return false; > + > + return true; > +} > + > static u64 mpam_msc_read_idr(struct mpam_msc *msc) > { > u64 idr_high = 0, idr_low; > @@ -951,9 +969,8 @@ static int mpam_msc_hw_probe(struct mpam_msc *msc) > > lockdep_assert_held(&msc->probe_lock); > > - idr = __mpam_read_reg(msc, MPAMF_AIDR); > - if ((idr & MPAMF_AIDR_ARCH_MAJOR_REV) != MPAM_ARCHITECTURE_V1) { nit: MPAM_ARCHITECTURE_V1 is now unused. Reviewed-by: Ben Horgan Thanks, Ben > - dev_err_once(dev, "MSC does not match MPAM architecture v1.x\n"); > + if (!mpam_msc_check_aidr(msc)) { > + dev_err_once(dev, "MSC does not match architecture v1.x\n"); > return -EIO; > } >