From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (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 AE51A358A4 for ; Fri, 27 Oct 2023 14:17:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="NCmaTBSL" Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.10]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3EF99B8; Fri, 27 Oct 2023 07:17:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1698416239; x=1729952239; h=date:from:to:cc:subject:message-id:references: mime-version:in-reply-to; bh=m6+aEYMf/hf5+wuZDssl5y6BUg7UjE4UJ94L84yPyfU=; b=NCmaTBSLn3CXBGPIloavGadDw0yXeeo3hGMHhIWLfo/HMYn3GjMICybY XkrYKjrXTPoMO3I4HU2smNpkvs6YWZHLwCFjnLfXj4KPlb/QR8q72CssT LDG6wewEqmhISY3EMCsBxIgW6LHOeGiXO5vNLpQK0PlYLhIIEjNURAlXC tT8Vvk69bNHVl9JfSsY/eb44lhtzn7vZ6mRjVUv1sgWv4IB+DxIMlGkY6 WYKwoP3ZT9BB+5820JWwfhAoI59OyOUquoc9/fPlPw+yAYkAU4X1GHVy2 LkEFUEIdfyTUjl2WViDDCgkzln1Xt0axbUXHzr+LsREQ2n8oR8XXSpt9p w==; X-IronPort-AV: E=McAfee;i="6600,9927,10876"; a="602552" X-IronPort-AV: E=Sophos;i="6.03,256,1694761200"; d="scan'208";a="602552" Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orvoesa102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Oct 2023 07:17:18 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10876"; a="794588821" X-IronPort-AV: E=Sophos;i="6.03,256,1694761200"; d="scan'208";a="794588821" Received: from black.fi.intel.com ([10.237.72.28]) by orsmga001.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Oct 2023 07:17:15 -0700 Date: Fri, 27 Oct 2023 17:17:12 +0300 From: Raag Jadav To: Mika Westerberg Cc: rafael@kernel.org, len.brown@intel.com, andriy.shevchenko@linux.intel.com, linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, mallikarjunappa.sangannavar@intel.com, bala.senthil@intel.com Subject: Re: [PATCH v2] ACPI: LPSS: use acpi_dev_uid_match() for matching _UID Message-ID: References: <20231026083335.12551-1-raag.jadav@intel.com> <20231027081855.GK3208943@black.fi.intel.com> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Fri, Oct 27, 2023 at 01:12:02PM +0300, Raag Jadav wrote: > On Fri, Oct 27, 2023 at 11:18:55AM +0300, Mika Westerberg wrote: > > On Thu, Oct 26, 2023 at 02:03:35PM +0530, Raag Jadav wrote: > > > Now that we have a standard ACPI helper, we can use acpi_dev_uid_match() > > > for matching _UID as per the original logic before commit 2a036e489eb1 > > > ("ACPI: LPSS: Refactor _UID handling to use acpi_dev_uid_to_integer()"), > > > instead of treating it as an integer. > > > > > > Signed-off-by: Raag Jadav > > > Acked-by: Mika Westerberg > > > > The change still looks good to me, however I wonder if we could maybe > > improve acpi_dev_uid_match() to support both data types possible for > > _UID? This of course is separate patch (unless there are objections). > > > > There is the _Generic() thing and I think that can be used to make > > > > acpi_dev_uid_match() > > > > which takes either u64 (or maybe even unsigned int) or const char * and > > based on that picks the correct implementation. Not sure if that's > > possible, did not check but it would allow us to use one function > > everywhere instead of acpi_dev_uid_to_integer() and > > acpi_dev_uid_match(). > > The way I see it, acpi_dev_uid_to_integer() is useful when drivers want to > parse _UID and store it in their private data, so that it is available for > making various decisions throughout the lifetime of the driver, as opposed > to acpi_dev_uid_match() which is more useful for oneshot comparisons in my > opinion. > > So I'm a bit conflicted about merging them into a single helper, unless > ofcourse there is a way to serve both purposes. Or perhaps something like, bool acpi_dev_uid_match(struct acpi_device *adev, const void *uid2, enum uid_type type) { u64 uid1_d, uid2_d; if (type == UID_TYPE_STR) { char *uid2_s = (char *)uid2; if (!(uid2_s && !kstrtou64(uid2_s, 0, &uid2_d))) return false; } else if (type == UID_TYPE_INT) { u64 *uid2_p; uid2_p = (u64 *)uid2; uid2_d = *uid2_p; } else { return false; } if (!acpi_dev_uid_to_integer(adev, &uid1_d) && uid1_d == uid2_d) return true; else return false; } Although this looks unnecessarily hideous. Raag