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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (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 AB670C43334 for ; Wed, 1 Jun 2022 22:02:37 +0000 (UTC) Received: from localhost ([::1]:48612 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nwWQG-0004mJ-Ed for qemu-devel@archiver.kernel.org; Wed, 01 Jun 2022 18:02:36 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:41032) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nwWOm-0003nJ-5D for qemu-devel@nongnu.org; Wed, 01 Jun 2022 18:01:04 -0400 Received: from mail-oa1-x2b.google.com ([2001:4860:4864:20::2b]:46755) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1nwWOi-0000MT-BB for qemu-devel@nongnu.org; Wed, 01 Jun 2022 18:01:03 -0400 Received: by mail-oa1-x2b.google.com with SMTP id 586e51a60fabf-d39f741ba0so4455313fac.13 for ; Wed, 01 Jun 2022 15:00:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mvista.com; s=google; h=date:from:to:cc:subject:message-id:reply-to:references:mime-version :in-reply-to; bh=yKIR2XAGIXB+/F2roqZ+sRhpJ+MioX1BVYAo+elJc3w=; b=cILiV5iEykBK2ogLEN2LedghnQGmWdyKSbXHFXS2WlY7KyCh1gH7mb4OxCVNbPAJW0 hnwQAx8NZ+nepi5jv0/fTFaWT0fyVpzPD5DQHlmjwJzP4fwL33wjuRihmsWg1PHFMKhr IEpIJFg0sNm4FxAmsO1r4nTKRwW+IcjcNtmts= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:from:to:cc:subject:message-id:reply-to :references:mime-version:in-reply-to; bh=yKIR2XAGIXB+/F2roqZ+sRhpJ+MioX1BVYAo+elJc3w=; b=DNxKmUjslBCj1rWlWUhmFSjMWPdj/nAEmi/H2V0jFAF5bmaO4Q9djaSidKOxd81MaV A5Hvc0HlvC3mKN2iCPscZGVobMGP8/XmOlvV4vYEKSbPiqgTT9aMrTL1nV0vGHVzcdSs egPSEuBWwr8Npuesf37ajqeim6L5EhTLGqV7DfJWEBsOswv+T2EWOpG4oV8m/C+cgny+ hzXc2jwxAnHSgCeS1EZobvgTwvM5BgmVjpoOgYdVYU4vZx6y1Z/LmBoCKMd18bp8pTw9 MMqEBaoezjlFyaz7xLOhvQlf+BaV/hsqewz6P0+O5bmmspP4SXaUclQPeNF6OlP0jDL1 VX8A== X-Gm-Message-State: AOAM532tRti+lzZdG6/2O6cCp0iHjdHba2JPapKzVxF//U2gktRuOgdg PEa13xdXiXd6qtDUEqe2DGsjRA== X-Google-Smtp-Source: ABdhPJwlu9o1BqqP6BYL5u7zsalUMMOsPL5NQjnMLvGr0ZUwoTxBOzcLgcKHgqgZTIlpsQj08KHKoA== X-Received: by 2002:a05:6870:c34a:b0:ed:d705:7a34 with SMTP id e10-20020a056870c34a00b000edd7057a34mr1001000oak.93.1654120858283; Wed, 01 Jun 2022 15:00:58 -0700 (PDT) Received: from minyard.net ([2001:470:b8f6:1b:cca5:4cab:9a61:6930]) by smtp.gmail.com with ESMTPSA id j2-20020a056870a48200b000f37c1d5072sm1193306oal.38.2022.06.01.15.00.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 01 Jun 2022 15:00:57 -0700 (PDT) Date: Wed, 1 Jun 2022 17:00:55 -0500 From: Corey Minyard To: Klaus Jensen Cc: qemu-devel@nongnu.org, Jonathan Cameron , qemu-arm@nongnu.org, Peter Delevoryas , Peter Maydell , Padmakar Kalghatgi , Damien Hedde , Andrew Jeffery , =?utf-8?Q?C=C3=A9dric?= Le Goater , Joel Stanley , Arun Kumar Kashinath Agasar , Klaus Jensen Subject: Re: [RFC PATCH v2 3/6] hw/i2c: support multiple masters Message-ID: <20220601220055.GR2554462@minyard.net> References: <20220601210831.67259-1-its@irrelevant.dk> <20220601210831.67259-4-its@irrelevant.dk> MIME-Version: 1.0 In-Reply-To: <20220601210831.67259-4-its@irrelevant.dk> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="000000000000307ef405e06a06ef" Received-SPF: pass client-ip=2001:4860:4864:20::2b; envelope-from=cminyard@mvista.com; helo=mail-oa1-x2b.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: cminyard@mvista.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" --000000000000307ef405e06a06ef Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Wed, Jun 01, 2022 at 11:08:28PM +0200, Klaus Jensen wrote: > From: Klaus Jensen > > Allow slaves to master the bus by registering a bottom halve. If the bus > is busy, the bottom halve is queued up. When a slave has succesfully ^ half > mastered the bus, the bottom halve is scheduled. ^ half "halve" is a verb that means to split something into two pieces. Yes, English is a strange language :). Also, technically from an I2C point of view, masters master the bus and slaves only respond. The way it's phrased here and elsewhere sounds a little strange from that point of view. I'm ok with this patch. It's straightforward. > > Signed-off-by: Klaus Jensen > --- > hw/i2c/core.c | 34 +++++++++++++++++++++++++++++++++- > include/hw/i2c/i2c.h | 14 ++++++++++++++ > 2 files changed, 47 insertions(+), 1 deletion(-) > > diff --git a/hw/i2c/core.c b/hw/i2c/core.c > index d0cb2d32fa44..145dce60782a 100644 > --- a/hw/i2c/core.c > +++ b/hw/i2c/core.c > @@ -13,6 +13,7 @@ > #include "migration/vmstate.h" > #include "qapi/error.h" > #include "qemu/module.h" > +#include "qemu/main-loop.h" > #include "trace.h" > > #define I2C_BROADCAST 0x00 > @@ -62,6 +63,7 @@ I2CBus *i2c_init_bus(DeviceState *parent, const char *name) > > bus = I2C_BUS(qbus_new(TYPE_I2C_BUS, parent, name)); > QLIST_INIT(&bus->current_devs); > + QSIMPLEQ_INIT(&bus->pending_masters); > vmstate_register(NULL, VMSTATE_INSTANCE_ID_ANY, &vmstate_i2c_bus, bus); > return bus; > } > @@ -74,7 +76,7 @@ void i2c_slave_set_address(I2CSlave *dev, uint8_t address) > /* Return nonzero if bus is busy. */ > int i2c_bus_busy(I2CBus *bus) > { > - return !QLIST_EMPTY(&bus->current_devs); > + return !QLIST_EMPTY(&bus->current_devs) || bus->bh; > } > > bool i2c_scan_bus(I2CBus *bus, uint8_t address, bool broadcast, > @@ -180,6 +182,26 @@ int i2c_start_transfer(I2CBus *bus, uint8_t address, bool is_recv) > : I2C_START_SEND); > } > > +void i2c_bus_master(I2CBus *bus, QEMUBH *bh) > +{ > + if (i2c_bus_busy(bus)) { > + I2CPendingMaster *node = g_new(struct I2CPendingMaster, 1); > + node->bh = bh; > + > + QSIMPLEQ_INSERT_TAIL(&bus->pending_masters, node, entry); > + > + return; > + } > + > + bus->bh = bh; > + qemu_bh_schedule(bus->bh); > +} > + > +void i2c_bus_release(I2CBus *bus) > +{ > + bus->bh = NULL; > +} > + > int i2c_start_recv(I2CBus *bus, uint8_t address) > { > return i2c_do_start_transfer(bus, address, I2C_START_RECV); > @@ -206,6 +228,16 @@ void i2c_end_transfer(I2CBus *bus) > g_free(node); > } > bus->broadcast = false; > + > + if (!QSIMPLEQ_EMPTY(&bus->pending_masters)) { > + I2CPendingMaster *node = QSIMPLEQ_FIRST(&bus->pending_masters); > + bus->bh = node->bh; > + > + QSIMPLEQ_REMOVE_HEAD(&bus->pending_masters, entry); > + g_free(node); > + > + qemu_bh_schedule(bus->bh); > + } > } > > int i2c_send(I2CBus *bus, uint8_t data) > diff --git a/include/hw/i2c/i2c.h b/include/hw/i2c/i2c.h > index 5ca3b708c0be..be8bb8b78a60 100644 > --- a/include/hw/i2c/i2c.h > +++ b/include/hw/i2c/i2c.h > @@ -69,13 +69,25 @@ struct I2CNode { > QLIST_ENTRY(I2CNode) next; > }; > > +typedef struct I2CPendingMaster I2CPendingMaster; > + > +struct I2CPendingMaster { > + QEMUBH *bh; > + QSIMPLEQ_ENTRY(I2CPendingMaster) entry; > +}; > + > typedef QLIST_HEAD(I2CNodeList, I2CNode) I2CNodeList; > +typedef QSIMPLEQ_HEAD(I2CPendingMasters, I2CPendingMaster) I2CPendingMasters; > > struct I2CBus { > BusState qbus; > I2CNodeList current_devs; > + I2CPendingMasters pending_masters; > uint8_t saved_address; > bool broadcast; > + > + /* Set from slave currently mastering the bus. */ > + QEMUBH *bh; > }; > > I2CBus *i2c_init_bus(DeviceState *parent, const char *name); > @@ -117,6 +129,8 @@ int i2c_start_send(I2CBus *bus, uint8_t address); > > void i2c_end_transfer(I2CBus *bus); > void i2c_nack(I2CBus *bus); > +void i2c_bus_master(I2CBus *bus, QEMUBH *bh); > +void i2c_bus_release(I2CBus *bus); > int i2c_send(I2CBus *bus, uint8_t data); > uint8_t i2c_recv(I2CBus *bus); > bool i2c_scan_bus(I2CBus *bus, uint8_t address, bool broadcast, > -- > 2.36.1 > --000000000000307ef405e06a06ef Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIIQ6AYJKoZIhvcNAQcCoIIQ2TCCENUCAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg gg4sMIIFXzCCBEegAwIBAgIQD/rh8xorQzw9muFtZDtYizANBgkqhkiG9w0BAQsFADBlMQswCQYD VQQGEwJVUzEVMBMGA1UEChMMRGlnaUNlcnQgSW5jMRkwFwYDVQQLExB3d3cuZGlnaWNlcnQuY29t MSQwIgYDVQQDExtEaWdpQ2VydCBBc3N1cmVkIElEIFJvb3QgRzIwHhcNMTkwOTIzMTIyNTMyWhcN 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