From nobody Tue Nov 26 10:28:39 2024 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.17]) (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 D0D8B206E79; Fri, 18 Oct 2024 19:46:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.17 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729280796; cv=none; b=tDQlZgx4ac4jBl0RWyCBgzITC4ee5ITFjeHdB8HOiTsjoYUrR9nrIVlL39ogKCpt1NnYwEHVZW7zIM8bUkOfgEnymq8eU11ltjW6wdmUJmzeOKns5o9ceF5TWvClG7hVkyUO6XqijNyLNGkKh+TXeGkNe5L/8Lx4dOw1yoPFoPU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729280796; c=relaxed/simple; bh=3JfD/IY0gogMnjuoL9D2GLfZIVy1JrKKP7OgwHv7vxc=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=rDaErFJL4blm56hSxVSZMo1tJfDdVwe+XVc9BekFyp4iLFJiZ0eA4++9NVi1gjPG+UbiDwhAaIlkiRTCQf+jAgwBFK2OxogAfw3AZHmSYtgT/IyvEf380j89NwwKX13Qn1TSF5dkFTfMVOp6K5YZRCihsbirxq0yJpivuNbG1JM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=kdH9rCRT; arc=none smtp.client-ip=192.198.163.17 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="kdH9rCRT" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1729280794; x=1760816794; h=from:date:subject:mime-version:content-transfer-encoding: message-id:references:in-reply-to:to:cc; bh=3JfD/IY0gogMnjuoL9D2GLfZIVy1JrKKP7OgwHv7vxc=; b=kdH9rCRTO/XqyBjoClDXNZysO+Qzybzg+2qIwEf8OjqyDoT2dKlOHvbE LgfsS24n9UfzlaTLQzM7V9tTfb+Yfew+w+rIabIag+7PyX2oktUFs2LDb 8cRi/inSy1/gYxBE/0mE2Y7T3Q9+yx/sbSVwzcRavZC8K5JCXstUacEmL YftVeMlze9edBh2nGk9uvcl2gKzr6FYK6a6mM0FgzTDMS7z7nJSceEWU2 kLKf1Q/6OQ2FhMLVHYxnxREPoEiYdRYcGp0Nilkwc1JUlp0M4QT5EZJu/ O+y+zQK/H0GDJOft1IMHkqy17TNJdVT1UXP2pCeavstztyawND3C7t78F g==; X-CSE-ConnectionGUID: qP1eZmGETqyj8ztITtzC1Q== X-CSE-MsgGUID: FK/7LuH4Tyya3ob1UWegkA== X-IronPort-AV: E=McAfee;i="6700,10204,11229"; a="28704458" X-IronPort-AV: E=Sophos;i="6.11,214,1725346800"; d="scan'208";a="28704458" Received: from fmviesa008.fm.intel.com ([10.60.135.148]) by fmvoesa111.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Oct 2024 12:46:33 -0700 X-CSE-ConnectionGUID: vIC43TlMTTy+WN58dTjGmg== X-CSE-MsgGUID: i6ikMtlSRtWVSGV1UgTgDA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.11,214,1725346800"; d="scan'208";a="79017578" Received: from ldmartin-desk2.corp.intel.com (HELO localhost) ([10.125.109.148]) by fmviesa008-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Oct 2024 12:46:32 -0700 From: Ira Weiny Date: Fri, 18 Oct 2024 14:46:25 -0500 Subject: [PATCH 2/3] printf: Add print format (%pra) for struct range Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20241018-cxl-pra-v1-2-7f49ba58208b@intel.com> References: <20241018-cxl-pra-v1-0-7f49ba58208b@intel.com> In-Reply-To: <20241018-cxl-pra-v1-0-7f49ba58208b@intel.com> To: Andrew Morton , Petr Mladek , Steven Rostedt , Andy Shevchenko , Rasmus Villemoes , Sergey Senozhatsky , Jonathan Corbet , Davidlohr Bueso , Jonathan Cameron , Dave Jiang , Alison Schofield , Vishal Verma , Dan Williams Cc: Fan Ni , Bagas Sanjaya , linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-cxl@vger.kernel.org, Ira Weiny X-Mailer: b4 0.15-dev-37811 X-Developer-Signature: v=1; a=ed25519-sha256; t=1729280784; l=7710; i=ira.weiny@intel.com; s=20221211; h=from:subject:message-id; bh=3JfD/IY0gogMnjuoL9D2GLfZIVy1JrKKP7OgwHv7vxc=; b=C7e4ofwLZmWqXfjvO1KoJnpVlBhnDe2j5+Ru7sVlECe5yt+qRTunxNvxUgHvuGG7Fsn/8AV6U Wl8nn34ZSxaA2tFUDAupRUR9QS/ZHdDDzDUea2nx0wSxz8iOSFoGgso X-Developer-Key: i=ira.weiny@intel.com; a=ed25519; pk=noldbkG+Wp1qXRrrkfY1QJpDf7QsOEthbOT7vm0PqsE= The use of struct range in the CXL subsystem is growing. In particular, the addition of Dynamic Capacity devices uses struct range in a number of places which are reported in debug and error messages. To wit requiring the printing of the start/end fields in each print became cumbersome. Dan Williams mentions in [1] that it might be time to have a print specifier for struct range similar to struct resource A few alternatives were considered including '%par', '%r', and '%pn'. %pra follows that struct range is similar to struct resource (%p[rR]) but needs to be different. Based on discussions with Petr and Andy '%pra' was chosen.[2] Andy also suggested to keep the range prints similar to struct resource though combined code. Add hex_range() to handle printing for both pointer types. Finally introduce DEFINE_RANGE() as a parallel to DEFINE_RES_*() and use it in the tests. Cc: Jonathan Corbet (maintainer:DOCUMENTATION) Cc: linux-doc@vger.kernel.org Cc: linux-kernel@vger.kernel.org (open list) Link: https://lore.kernel.org/all/663922b475e50_d54d72945b@dwillia2-xfh.jf.= intel.com.notmuch/ [1] Link: https://lore.kernel.org/all/66cea3bf3332f_f937b29424@iweiny-mobl.notm= uch/ [2] Suggested-by: "Dan Williams" Signed-off-by: Ira Weiny --- Changes: [iweiny: split from CXL patch set] [Andy: Define DEFINE_RANGE()] [Andy: rework hex_range() logic] [Andy: Don't use fallthrough] [Andy: clean up help comment] [Fan: clean up printk comment] [Rasmus: fix buf processing in hex_range()] [Rasmus: simplify buffer sizing] [Rasmus: add '[' to string] [Bagas: Clarify the start =3D=3D end print behavior] --- Documentation/core-api/printk-formats.rst | 13 +++++++ include/linux/range.h | 6 ++++ lib/test_printf.c | 17 +++++++++ lib/vsprintf.c | 57 +++++++++++++++++++++++++++= ---- 4 files changed, 87 insertions(+), 6 deletions(-) diff --git a/Documentation/core-api/printk-formats.rst b/Documentation/core= -api/printk-formats.rst index 14e093da3ccd..e1ebf0376154 100644 --- a/Documentation/core-api/printk-formats.rst +++ b/Documentation/core-api/printk-formats.rst @@ -231,6 +231,19 @@ width of the CPU data path. =20 Passed by reference. =20 +Struct Range +------------ + +:: + + %pra [range 0x0000000060000000-0x000000006fffffff] + %pra [range 0x0000000060000000] + +For printing struct range. struct range holds an arbitrary range of u64 +values. If start is equal to end only print the start value. + +Passed by reference. + DMA address types dma_addr_t ---------------------------- =20 diff --git a/include/linux/range.h b/include/linux/range.h index 6ad0b73cb7ad..1358d4b1807a 100644 --- a/include/linux/range.h +++ b/include/linux/range.h @@ -31,4 +31,10 @@ int clean_sort_range(struct range *range, int az); =20 void sort_range(struct range *range, int nr_range); =20 +#define DEFINE_RANGE(_start, _end) \ +(struct range) { \ + .start =3D (_start), \ + .end =3D (_end), \ + } + #endif diff --git a/lib/test_printf.c b/lib/test_printf.c index 5afdf5efc627..59dbe4f9a4cb 100644 --- a/lib/test_printf.c +++ b/lib/test_printf.c @@ -432,6 +432,22 @@ struct_resource(void) "%pR", &test_resource); } =20 +static void __init +struct_range(void) +{ + struct range test_range =3D DEFINE_RANGE(0xc0ffee00ba5eba11, + 0xc0ffee00ba5eba11); + test("[range 0xc0ffee00ba5eba11]", "%pra", &test_range); + + test_range =3D DEFINE_RANGE(0xc0ffee, 0xba5eba11); + test("[range 0x0000000000c0ffee-0x00000000ba5eba11]", + "%pra", &test_range); + + test_range =3D DEFINE_RANGE(0xba5eba11, 0xc0ffee); + test("[range 0x00000000ba5eba11-0x0000000000c0ffee]", + "%pra", &test_range); +} + static void __init addr(void) { @@ -807,6 +823,7 @@ test_pointer(void) symbol_ptr(); kernel_ptr(); struct_resource(); + struct_range(); addr(); escaped_str(); hex_string(); diff --git a/lib/vsprintf.c b/lib/vsprintf.c index 09f022ba1c05..f6a62f273fad 100644 --- a/lib/vsprintf.c +++ b/lib/vsprintf.c @@ -1039,6 +1039,20 @@ static const struct printf_spec default_dec04_spec = =3D { .flags =3D ZEROPAD, }; =20 +static noinline_for_stack +char *hex_range(char *buf, char *end, u64 start_val, u64 end_val, + struct printf_spec spec) +{ + buf =3D number(buf, end, start_val, spec); + if (start_val =3D=3D end_val) + return buf; + + if (buf < end) + *buf =3D '-'; + ++buf; + return number(buf, end, end_val, spec); +} + static noinline_for_stack char *resource_string(char *buf, char *end, struct resource *res, struct printf_spec spec, const char *fmt) @@ -1115,11 +1129,7 @@ char *resource_string(char *buf, char *end, struct r= esource *res, p =3D string_nocheck(p, pend, "size ", str_spec); p =3D number(p, pend, resource_size(res), *specp); } else { - p =3D number(p, pend, res->start, *specp); - if (res->start !=3D res->end) { - *p++ =3D '-'; - p =3D number(p, pend, res->end, *specp); - } + p =3D hex_range(p, pend, res->start, res->end, *specp); } if (decode) { if (res->flags & IORESOURCE_MEM_64) @@ -1140,6 +1150,31 @@ char *resource_string(char *buf, char *end, struct r= esource *res, return string_nocheck(buf, end, sym, spec); } =20 +static noinline_for_stack +char *range_string(char *buf, char *end, const struct range *range, + struct printf_spec spec, const char *fmt) +{ + char sym[sizeof("[range 0x0123456789abcdef-0x0123456789abcdef]")]; + char *p =3D sym, *pend =3D sym + sizeof(sym); + + struct printf_spec range_spec =3D { + .field_width =3D 2 + 2 * sizeof(range->start), /* 0x + 2 * 8 */ + .flags =3D SPECIAL | SMALL | ZEROPAD, + .base =3D 16, + .precision =3D -1, + }; + + if (check_pointer(&buf, end, range, spec)) + return buf; + + p =3D string_nocheck(p, pend, "[range ", default_str_spec); + p =3D hex_range(p, pend, range->start, range->end, range_spec); + *p++ =3D ']'; + *p =3D '\0'; + + return string_nocheck(buf, end, sym, spec); +} + static noinline_for_stack char *hex_string(char *buf, char *end, u8 *addr, struct printf_spec spec, const char *fmt) @@ -2229,6 +2264,15 @@ char *fwnode_string(char *buf, char *end, struct fwn= ode_handle *fwnode, return widen_string(buf, buf - buf_start, end, spec); } =20 +static noinline_for_stack +char *resource_and_range(const char *fmt, char *buf, char *end, void *ptr, + struct printf_spec spec) +{ + if (*fmt =3D=3D 'r' && fmt[1] =3D=3D 'a') + return range_string(buf, end, ptr, spec, fmt); + return resource_string(buf, end, ptr, spec, fmt); +} + int __init no_hash_pointers_enable(char *str) { if (no_hash_pointers) @@ -2277,6 +2321,7 @@ char *rust_fmt_argument(char *buf, char *end, void *p= tr); * - 'Bb' as above with module build ID (for use in backtraces) * - 'R' For decoded struct resource, e.g., [mem 0x0-0x1f 64bit pref] * - 'r' For raw struct resource, e.g., [mem 0x0-0x1f flags 0x201] + * - 'ra' For struct ranges, e.g., [range 0x0000000000000000 - 0x000000000= 00000ff] * - 'b[l]' For a bitmap, the number of bits is determined by the field * width which must be explicitly specified either as part of the * format string '%32b[l]' or through '%*b[l]', [l] selects @@ -2401,7 +2446,7 @@ char *pointer(const char *fmt, char *buf, char *end, = void *ptr, return symbol_string(buf, end, ptr, spec, fmt); case 'R': case 'r': - return resource_string(buf, end, ptr, spec, fmt); + return resource_and_range(fmt, buf, end, ptr, spec); case 'h': return hex_string(buf, end, ptr, spec, fmt); case 'b': --=20 2.47.0