From mboxrd@z Thu Jan 1 00:00:00 1970 Delivery-date: Mon, 04 Mar 2024 10:38:17 +0100 Received: from metis.whiteo.stw.pengutronix.de ([2a0a:edc0:2:b01:1d::104]) by lore.white.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1rh4m1-0087D1-0O for lore@lore.pengutronix.de; Mon, 04 Mar 2024 10:38:17 +0100 Received: from bombadil.infradead.org ([2607:7c80:54:3::133]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1rh4lw-0001G4-5j for lore@pengutronix.de; Mon, 04 Mar 2024 10:38:17 +0100 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:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=AyPkkb9xBtIUCkAfcA5ngjp4mf3tZwD9HxuhhKxyoxY=; b=0WSd+psA4IcflYSkN8ByPDMtEU CcxVTnZqDmuOo6cW3CQHXA6yGnWD3MOIbILEqTthM0Be3mAvu/xFXap1hDhTYdn/oL8ssOXNue+El xpC4TKeOmJvlt1kbt5Ul+CfpaJQoLbqMLfJCElW+B9GhZiAULW+Ild7sdCsEiDz7a/vl2VaDExdCa slxpGrqsKX8fu291NcC6wUof2lk9I8On3WOrOHFkhtbXlKQ19ddtseBG7nyG9XXTTWcOwxkNvfcp2 d//99/aJLnZe+N2qzRJ8YWoVKp2PdRnyvqGBTh7G3mdYT7niQpHujtiP9bSBni0srVJZwo/w/fT6C TTq/YDmw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rh4l1-00000008QQK-2kik; Mon, 04 Mar 2024 09:37:15 +0000 Received: from metis.whiteo.stw.pengutronix.de ([2a0a:edc0:2:b01:1d::104]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1rh4ky-00000008QPO-03L3 for barebox@lists.infradead.org; Mon, 04 Mar 2024 09:37:13 +0000 Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1rh4ku-00013B-RE; Mon, 04 Mar 2024 10:37:08 +0100 Received: from [2a0a:edc0:2:b01:1d::c5] (helo=pty.whiteo.stw.pengutronix.de) by drehscheibe.grey.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1rh4ks-004KAr-IX; Mon, 04 Mar 2024 10:37:06 +0100 Received: from sha by pty.whiteo.stw.pengutronix.de with local (Exim 4.96) (envelope-from ) id 1rh4ks-001qh1-1a; Mon, 04 Mar 2024 10:37:06 +0100 Date: Mon, 4 Mar 2024 10:37:06 +0100 From: Sascha Hauer To: Ahmad Fatoum Cc: barebox@lists.infradead.org Message-ID: References: <20240301130445.171385-1-a.fatoum@pengutronix.de> <20240301130445.171385-3-a.fatoum@pengutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20240301130445.171385-3-a.fatoum@pengutronix.de> X-Sent-From: Pengutronix Hildesheim X-URL: http://www.pengutronix.de/ X-Accept-Language: de,en X-Accept-Content-Type: text/plain X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240304_013712_089408_7F5089E4 X-CRM114-Status: GOOD ( 27.54 ) X-BeenThere: barebox@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "barebox" X-SA-Exim-Connect-IP: 2607:7c80:54:3::133 X-SA-Exim-Mail-From: barebox-bounces+lore=pengutronix.de@lists.infradead.org X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on metis.whiteo.stw.pengutronix.de X-Spam-Level: X-Spam-Status: No, score=-5.5 required=4.0 tests=AWL,BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED,SPF_HELO_NONE,SPF_NONE, T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.2 Subject: Re: [PATCH 2/4] of: fdt: implement fdt_machine_is_compatible X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on metis.whiteo.stw.pengutronix.de) On Fri, Mar 01, 2024 at 02:04:43PM +0100, Ahmad Fatoum wrote: > When finding compatible bootloader spec files, barebox will unflatten > each DTB in turn, allocating objects for each property and node, only to > compare a single property and then free all the allocations again. > > Given that this operation is repeated for every device tree until a > match is found, it's a good idea to be able to compare machine > (top-level) compatibles without having to unflatten the whole FDT. > > Implemnt fdt_machine_is_compatible() that does just that. This > intentionally opencodes the device tree iteration as to minimize > code and runtime size. Using libfdt without LTO would be slower > and bigger. > > Signed-off-by: Ahmad Fatoum > --- > drivers/of/fdt.c | 95 ++++++++++++++++++++++++++++++++++++++++++++++++ > include/of.h | 3 ++ > 2 files changed, 98 insertions(+) > > diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c > index 676b8a5535bf..aa3d2e967acd 100644 > --- a/drivers/of/fdt.c > +++ b/drivers/of/fdt.c > @@ -668,3 +668,98 @@ void fdt_print_reserve_map(const void *__fdt) > return; > } > } > + > +static int fdt_string_is_compatible(const char *haystack, int haystack_len, > + const char *needle, int needle_len) > +{ > + const char *p; > + int index = 0; > + > + while (haystack_len >= needle_len) { > + if (memcmp(needle, haystack, needle_len + 1) == 0) > + return OF_DEVICE_COMPATIBLE_MAX_SCORE - (index << 2); > + > + p = memchr(haystack, '\0', haystack_len); > + if (!p) > + return 0; > + haystack_len -= (p - haystack) + 1; > + haystack = p + 1; > + index++; > + } > + > + return 0; > +} > + > +bool fdt_machine_is_compatible(const struct fdt_header *fdt, size_t fdt_size, const char *compat) > +{ > + uint32_t tag; > + const struct fdt_property *fdt_prop; > + const char *name; > + uint32_t dt_struct; > + const struct fdt_node_header *fnh; > + const void *dt_strings; > + struct fdt_header f; > + int ret, len; > + int expect = FDT_BEGIN_NODE; > + int compat_len = strlen(compat); > + > + ret = fdt_parse_header(fdt, fdt_size, &f); > + if (ret < 0) > + return ERR_PTR(ret); return false here Sascha -- Pengutronix e.K. | | Steuerwalder Str. 21 | http://www.pengutronix.de/ | 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |