From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (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 EB34832253C; Mon, 18 Aug 2025 15:52:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755532368; cv=none; b=GjLLHjzXum/SgN510CNm+KH1r4PXMgxkFPOq3KM6b9/Rhk0CPbfMys9G5bZs0X6YshjmntQACS7bHjyfuAVMtI4+M8w0094dWpOTrEljqmZ81F6kU3YGt6//4rp+Qua3pdsDTJWchwfeo3flk+oGLCqqAPeK7C661E9FqGa7+G0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755532368; c=relaxed/simple; bh=ueK0eGjGBvHaOske4O4HcgW8ofFdjgjE1ClcA4KMarU=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=lVXWURnazDBe0E9Gr3J5cwvoUIqNPxevb5AeJeCPnyRffXe4iPWqlxYeR4yOtXugnrYdofYTdacWoVFX32kG5xxZN16GSu56wpTdLuC+2N2cWmZyi1cLGF5Sce8j35qPfaEcu2b6s/oAqBLVKtNuRPUBLyn8GAE8hqQWUqQgcmE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=casper.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=jXNo8u8X; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=casper.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="jXNo8u8X" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=QYGzmgGNKxSTHKvcy9fQp+KsMkSGQinyb1trgkR3MMw=; b=jXNo8u8Xif4IH01+71pZYkIwjE OfyX0mF+/UizCTWiFaKYjPiQkxpDE8eSwP17iE1xUwO3GeDVx9mg2BOQhdDAK2Qfn7NaSFr1YQrdf JKSLKW1m4QkhSsE6ZhP3fYGi4Yick3IGcZIsZcE4qPdUuM846fiZ9/zyu0/clqY/d37sMNH104VIY v/20fO15T8tc4pbTFnkdpNsFqx2ERV7Jby/m9Ea1pNHRh127Ot3kGoXjsMtNg9Qknl2lyGuqTL1kR +Sy4Tqso27o+ZdJMQRwDjen4++Vpv7SjG5OjeAT47L/NUQ5rv2/n2wqBlBfCp0vmowbQ6G8iFOD7O NAH0Jyrg==; Received: from 54-240-197-233.amazon.com ([54.240.197.233] helo=u09cd745991455d.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.98.2 #2 (Red Hat Linux)) id 1uo29u-000000086Af-3HDs; Mon, 18 Aug 2025 15:52:31 +0000 Message-ID: Subject: Re: [PATCH v4 28/34] x86/cacheinfo: Use parsed CPUID(0x80000005) and CPUID(0x80000006) From: David Woodhouse To: Dave Hansen , "Ahmed S. Darwish" , Borislav Petkov , Ingo Molnar , Dave Hansen Cc: Thomas Gleixner , Andrew Cooper , "H. Peter Anvin" , Sean Christopherson , Peter Zijlstra , Sohil Mehta , John Ogness , x86@kernel.org, x86-cpuid@lists.linux.dev, LKML Date: Mon, 18 Aug 2025 16:52:30 +0100 In-Reply-To: <4a680b7d-2ecb-4579-a5ea-b612c08ebefa@intel.com> References: <20250815070227.19981-1-darwi@linutronix.de> <20250815070227.19981-29-darwi@linutronix.de> <4a680b7d-2ecb-4579-a5ea-b612c08ebefa@intel.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-XOyzBf32LZ6qIdEehbzo" User-Agent: Evolution 3.52.3-0ubuntu1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html --=-XOyzBf32LZ6qIdEehbzo Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2025-08-15 at 08:25 -0700, Dave Hansen wrote: > On 8/15/25 00:02, Ahmed S. Darwish wrote: > > +static void legacy_amd_cpuid4(struct cpuinfo_x86 *c, int index, > > struct leaf_0x4_0 *regs) > > =C2=A0 { > > - unsigned int dummy, line_size, lines_per_tag, assoc, > > size_in_kb; > > - union l1_cache l1i, l1d, *l1; > > - union l2_cache l2; > > - union l3_cache l3; > > + const struct leaf_0x80000005_0 *el5 =3D cpuid_leaf(c, > > 0x80000005); > > + const struct leaf_0x80000006_0 *el6 =3D cpuid_leaf(c, > > 0x80000006); > > + const struct cpuid_regs *el5_raw =3D (const struct > > cpuid_regs *)el5; >=20 > Is there any way we could get rid of the casts? The lack of type > safety > on those always worries me. Maybe a helper like this: >=20 > =C2=A0=C2=A0=C2=A0 const struct cpuid_regs *el5_raw =3D cpuid_leaf_raw(c,= 0x80000006); >=20 > (although that would probably just do casts internally). The other > way > would be to rig the macros up so that each 'struct leaf_$FOO' had a: >=20 > union { > struct leaf_0x80000005_0 l; > struct cpuid_regs raw; > }; >=20 > and then the macros just selected one of the two. How about automatically building the cast into the macro invocation... #define cpuid_leaf(c, l) ((struct cpuid_leaf_ ## l *)__cpuid_leaf(c, l) #define cpuid_lead_index(c, l, i) ((struct cpuid_leaf_ ## l ## _ ## i) __cp= uid_leaf_index(c, l, i) That's a bit ugly unless we can canonicalise the leaf and index values though. It even forces us to use raw numbers instead of names. 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