From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AB8JxZpGuSJU1PznwpewtuAIXfDPyi7nbHZEb91uY/si6Hg44zGl/bUSeOISXFtJ/7Hdj+LgSpxj ARC-Seal: i=1; a=rsa-sha256; t=1527003408; cv=none; d=google.com; s=arc-20160816; b=tKX0G2VHzQugtbJr9zb4uHIYQPlYmtHoYdHNTozqUW1Re4AutPa4cyNLZSpQca+CHr T6NgrEWNR3fsFlUilJscw0p9FgR8atCxh2NUMBvQSXMMxdyHWlaZkdMiBRB3NTg2AKqw n+wTO763NzQFtnblxvlqZQm8hBkkOwkTuWhxFQl/y+mNNuEVYy4VbZeR6j0awrCFlcmZ 9N+u+ubuQg12PNfe5dVJLnNoCXhKOwR9f+l1LyHvxfJYcGEHOHlqCfpU/ASFkhwjnv8x cU5ZTStmafFEKqIrbWe4ApmJE+HwuECXNL525uyue8ckG7x+zS39V+3MhQd+ts9jzuNr iS3Q== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=content-transfer-encoding:content-language:in-reply-to:mime-version :user-agent:date:message-id:from:references:cc:to:subject :arc-authentication-results; bh=/w8DgRVODCU9zJNY6tj8og9adTs1gRh6Cx4OcGg2QvM=; b=a8AO7Grx6b9fUd1qV2nXX5Y0Gb8gTqpOikzaDdpixwEsNlZGwoNRQpCTmWuz90fU7a muvcyITLZgW379+M0G2Q8vNTeHajfDJ9NIkzp0gVfJQ0YHxVzUIfR2KQsK+NaaPvKDy3 pQzcJWUQe0DQYlsMPmI2o244ycoOWsK7YL9ZimbE1EU0fYd0FJrzGwrsz8qVFQKpJWxg zFn0y9PvVARFkqQScKX1em9zwLKGgBu3XGWxWpTT4OL7PH7zmWP81Ebg0nh7W2zC1UhO FoxG4MPfSeLuNLUOOrPkQur4PMyBBGR2WQiOw+WZi4qTfYyR1zOcULmj5IIq2A6gFibo jIyw== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of jonathanh@nvidia.com designates 216.228.121.64 as permitted sender) smtp.mailfrom=jonathanh@nvidia.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=nvidia.com Authentication-Results: mx.google.com; spf=pass (google.com: domain of jonathanh@nvidia.com designates 216.228.121.64 as permitted sender) smtp.mailfrom=jonathanh@nvidia.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=nvidia.com X-PGP-Universal: processed; by hqpgpgate102.nvidia.com on Tue, 22 May 2018 08:36:49 -0700 Subject: Re: [PATCH 4/8] mailbox: tegra-hsp: Refactor in preparation of mailboxes To: Mikko Perttunen , , , , , CC: , , , , , References: <20180508114403.14499-1-mperttunen@nvidia.com> <20180508114403.14499-5-mperttunen@nvidia.com> From: Jon Hunter Message-ID: <8306b033-e7f5-748c-6e6a-131dfd6a26b8@nvidia.com> Date: Tue, 22 May 2018 16:36:24 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 In-Reply-To: <20180508114403.14499-5-mperttunen@nvidia.com> X-Originating-IP: [10.124.1.5] X-ClientProxiedBy: HQMAIL105.nvidia.com (172.20.187.12) To HQMAIL101.nvidia.com (172.20.187.10) Content-Type: text/plain; charset="utf-8"; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1599896472420172969?= X-GMAIL-MSGID: =?utf-8?q?1601179125437155667?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: On 08/05/18 12:43, Mikko Perttunen wrote: > The HSP driver is currently in many places written with the assumption > of only supporting doorbells. Prepare for the addition of shared > mailbox support by removing these assumptions and cleaning up the code. > > Signed-off-by: Mikko Perttunen > --- > drivers/mailbox/tegra-hsp.c | 124 +++++++++++++++++++++++++++++--------------- > 1 file changed, 82 insertions(+), 42 deletions(-) > > diff --git a/drivers/mailbox/tegra-hsp.c b/drivers/mailbox/tegra-hsp.c > index 0cde356c11ab..16eb970f2c9f 100644 > --- a/drivers/mailbox/tegra-hsp.c > +++ b/drivers/mailbox/tegra-hsp.c > @@ -1,5 +1,5 @@ > /* > - * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved. > + * Copyright (c) 2016-2018, NVIDIA CORPORATION. All rights reserved. > * > * This program is free software; you can redistribute it and/or modify it > * under the terms and conditions of the GNU General Public License, > @@ -42,6 +42,7 @@ struct tegra_hsp_channel; > struct tegra_hsp; > > struct tegra_hsp_channel { > + unsigned int type; > struct tegra_hsp *hsp; > struct mbox_chan *chan; > void __iomem *regs; > @@ -55,6 +56,12 @@ struct tegra_hsp_doorbell { > unsigned int index; > }; > > +static inline struct tegra_hsp_doorbell * > +channel_to_doorbell(struct tegra_hsp_channel *channel) > +{ > + return container_of(channel, struct tegra_hsp_doorbell, channel); > +} > + > struct tegra_hsp_db_map { > const char *name; > unsigned int master; > @@ -69,7 +76,7 @@ struct tegra_hsp { > const struct tegra_hsp_soc *soc; > struct mbox_controller mbox; > void __iomem *regs; > - unsigned int irq; > + unsigned int doorbell_irq; > unsigned int num_sm; > unsigned int num_as; > unsigned int num_ss; > @@ -194,7 +201,7 @@ tegra_hsp_doorbell_create(struct tegra_hsp *hsp, const char *name, > if (!db) > return ERR_PTR(-ENOMEM); > > - offset = (1 + (hsp->num_sm / 2) + hsp->num_ss + hsp->num_as) << 16; > + offset = (1 + (hsp->num_sm / 2) + hsp->num_ss + hsp->num_as) * SZ_64K; > offset += index * 0x100; > > db->channel.regs = hsp->regs + offset; > @@ -218,18 +225,8 @@ static void __tegra_hsp_doorbell_destroy(struct tegra_hsp_doorbell *db) > kfree(db); > } > > -static int tegra_hsp_doorbell_send_data(struct mbox_chan *chan, void *data) > -{ > - struct tegra_hsp_doorbell *db = chan->con_priv; > - > - tegra_hsp_channel_writel(&db->channel, 1, HSP_DB_TRIGGER); > - > - return 0; > -} > - > -static int tegra_hsp_doorbell_startup(struct mbox_chan *chan) > +static int tegra_hsp_doorbell_startup(struct tegra_hsp_doorbell *db) > { > - struct tegra_hsp_doorbell *db = chan->con_priv; > struct tegra_hsp *hsp = db->channel.hsp; > struct tegra_hsp_doorbell *ccplex; > unsigned long flags; > @@ -260,9 +257,8 @@ static int tegra_hsp_doorbell_startup(struct mbox_chan *chan) > return 0; > } > > -static void tegra_hsp_doorbell_shutdown(struct mbox_chan *chan) > +static void tegra_hsp_doorbell_shutdown(struct tegra_hsp_doorbell *db) > { > - struct tegra_hsp_doorbell *db = chan->con_priv; > struct tegra_hsp *hsp = db->channel.hsp; > struct tegra_hsp_doorbell *ccplex; > unsigned long flags; > @@ -281,35 +277,61 @@ static void tegra_hsp_doorbell_shutdown(struct mbox_chan *chan) > spin_unlock_irqrestore(&hsp->lock, flags); > } > > -static const struct mbox_chan_ops tegra_hsp_doorbell_ops = { > - .send_data = tegra_hsp_doorbell_send_data, > - .startup = tegra_hsp_doorbell_startup, > - .shutdown = tegra_hsp_doorbell_shutdown, > +static int tegra_hsp_send_data(struct mbox_chan *chan, void *data) > +{ > + struct tegra_hsp_channel *channel = chan->con_priv; > + struct tegra_hsp_doorbell *db; > + > + switch (channel->type) { > + case TEGRA_HSP_MBOX_TYPE_DB: > + db = channel_to_doorbell(channel); > + tegra_hsp_channel_writel(&db->channel, 1, HSP_DB_TRIGGER); The above appears to be redundant. We go from channel to db and then end up passing channels. Do we really need the 'db' struct above? > + } > + > + return -EINVAL; Does this function always return -EINVAL? > +} > + > +static int tegra_hsp_startup(struct mbox_chan *chan) > +{ > + struct tegra_hsp_channel *channel = chan->con_priv; > + > + switch (channel->type) { > + case TEGRA_HSP_MBOX_TYPE_DB: > + return tegra_hsp_doorbell_startup(channel_to_doorbell(channel)); > + } > + > + return -EINVAL; > +} > + > +static void tegra_hsp_shutdown(struct mbox_chan *chan) > +{ > + struct tegra_hsp_channel *channel = chan->con_priv; > + > + switch (channel->type) { > + case TEGRA_HSP_MBOX_TYPE_DB: > + tegra_hsp_doorbell_shutdown(channel_to_doorbell(channel)); > + break; > + } > +} > + > +static const struct mbox_chan_ops tegra_hsp_ops = { > + .send_data = tegra_hsp_send_data, > + .startup = tegra_hsp_startup, > + .shutdown = tegra_hsp_shutdown, > }; > > -static struct mbox_chan *of_tegra_hsp_xlate(struct mbox_controller *mbox, > - const struct of_phandle_args *args) > +static struct mbox_chan *tegra_hsp_doorbell_xlate(struct tegra_hsp *hsp, > + unsigned int master) > { > struct tegra_hsp_channel *channel = ERR_PTR(-ENODEV); > - struct tegra_hsp *hsp = to_tegra_hsp(mbox); > - unsigned int type = args->args[0]; > - unsigned int master = args->args[1]; > struct tegra_hsp_doorbell *db; > struct mbox_chan *chan; > unsigned long flags; > unsigned int i; > > - switch (type) { > - case TEGRA_HSP_MBOX_TYPE_DB: > - db = tegra_hsp_doorbell_get(hsp, master); > - if (db) > - channel = &db->channel; > - > - break; > - > - default: > - break; > - } > + db = tegra_hsp_doorbell_get(hsp, master); > + if (db) > + channel = &db->channel; > > if (IS_ERR(channel)) > return ERR_CAST(channel); > @@ -321,6 +343,7 @@ static struct mbox_chan *of_tegra_hsp_xlate(struct mbox_controller *mbox, > if (!chan->con_priv) { > chan->con_priv = channel; > channel->chan = chan; > + channel->type = TEGRA_HSP_MBOX_TYPE_DB; > break; I see that you are making the above only used for doorbells, but don't we still need to set the chan->con_priv for shared mailboxes as well? Cheers Jon -- nvpublic