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Mon, 05 Jun 2023 12:47:44 -0700 (PDT) Received: from [172.22.22.28] ([98.61.227.136]) by smtp.gmail.com with ESMTPSA id l9-20020a02a889000000b00408b3bc8061sm2451565jam.43.2023.06.05.12.47.43 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 05 Jun 2023 12:47:44 -0700 (PDT) Message-ID: Date: Mon, 5 Jun 2023 14:47:42 -0500 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.11.0 From: Alex Elder Subject: Re: [PATCH v13 05/24] mailbox: Add Gunyah message queue mailbox To: Elliot Berman , Srinivas Kandagatla , Prakruthi Deepak Heragu , Jonathan Corbet , Jassi Brar Cc: Murali Nalajala , Trilok Soni , Srivatsa Vaddagiri , Carl van Schaik , Dmitry Baryshkov , Bjorn Andersson , Konrad Dybcio , Arnd Bergmann , Greg Kroah-Hartman , Rob Herring , Krzysztof Kozlowski , Bagas Sanjaya , Will Deacon , Andy Gross , Catalin Marinas , linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-arm-kernel@lists.infradead.org References: <20230509204801.2824351-1-quic_eberman@quicinc.com> <20230509204801.2824351-6-quic_eberman@quicinc.com> Content-Language: en-US In-Reply-To: <20230509204801.2824351-6-quic_eberman@quicinc.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230605_124745_229936_A4369742 X-CRM114-Status: GOOD ( 33.85 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 5/9/23 3:47 PM, Elliot Berman wrote: > Gunyah message queues are a unidirectional inter-VM pipe for messages up > to 1024 bytes. This driver supports pairing a receiver message queue and > a transmitter message queue to expose a single mailbox channel. > > Signed-off-by: Elliot Berman This patch does not apply properly, because it updates "message-queue.rst", which does not currently exist. I'm going to ignore that for now, though. I'm generally OK with giving you my "Reviewed-by" on this but I'll wait until you send v14 with the full content of "message-queue.rst". Also, I suggest below that you update all your SPDX tags to no longer use the deprecated "GPL-2.0" identifier. -Alex > --- > Documentation/virt/gunyah/message-queue.rst | 8 + > drivers/mailbox/Makefile | 2 + > drivers/mailbox/gunyah-msgq.c | 212 ++++++++++++++++++++ > include/linux/gunyah.h | 57 ++++++ > 4 files changed, 279 insertions(+) > create mode 100644 drivers/mailbox/gunyah-msgq.c > > diff --git a/Documentation/virt/gunyah/message-queue.rst b/Documentation/virt/gunyah/message-queue.rst > index b352918ae54b..70d82a4ef32d 100644 > --- a/Documentation/virt/gunyah/message-queue.rst > +++ b/Documentation/virt/gunyah/message-queue.rst > @@ -61,3 +61,11 @@ vIRQ: two TX message queues will have two vIRQs (and two capability IDs). > | | | | | | > | | | | | | > +---------------+ +-----------------+ +---------------+ > + > +Gunyah message queues are exposed as mailboxes. To create the mailbox, create > +a mbox_client and call `gh_msgq_init()`. On receipt of the RX_READY interrupt, > +all messages in the RX message queue are read and pushed via the `rx_callback` > +of the registered mbox_client. > + > +.. kernel-doc:: drivers/mailbox/gunyah-msgq.c > + :identifiers: gh_msgq_init > diff --git a/drivers/mailbox/Makefile b/drivers/mailbox/Makefile > index fc9376117111..5f929bb55e9a 100644 > --- a/drivers/mailbox/Makefile > +++ b/drivers/mailbox/Makefile > @@ -55,6 +55,8 @@ obj-$(CONFIG_MTK_CMDQ_MBOX) += mtk-cmdq-mailbox.o > > obj-$(CONFIG_ZYNQMP_IPI_MBOX) += zynqmp-ipi-mailbox.o > > +obj-$(CONFIG_GUNYAH) += gunyah-msgq.o > + > obj-$(CONFIG_SUN6I_MSGBOX) += sun6i-msgbox.o > > obj-$(CONFIG_SPRD_MBOX) += sprd-mailbox.o > diff --git a/drivers/mailbox/gunyah-msgq.c b/drivers/mailbox/gunyah-msgq.c > new file mode 100644 > index 000000000000..b7a54f233680 > --- /dev/null > +++ b/drivers/mailbox/gunyah-msgq.c > @@ -0,0 +1,212 @@ > +// SPDX-License-Identifier: GPL-2.0-only After seeing this tag I looked into it, and see that SPDX has deprecated "GPL-2.0" in favor of "GPL-2.0-only". Please update all SPDX licenses that use "GPL-2.0" to use this new tag instead. > +/* > + * Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved. > + */ > + > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > + > +#define mbox_chan_to_msgq(chan) (container_of(chan->mbox, struct gh_msgq, mbox)) Parentheses are not needed around a container_of() call. > + > +static irqreturn_t gh_msgq_rx_irq_handler(int irq, void *data) > +{ > + struct gh_msgq *msgq = data; > + struct gh_msgq_rx_data rx_data; > + enum gh_error gh_error; > + bool ready = true; > + > + while (ready) { > + gh_error = gh_hypercall_msgq_recv(msgq->rx_ghrsc->capid, > + &rx_data.data, sizeof(rx_data.data), > + &rx_data.length, &ready); > + if (gh_error != GH_ERROR_OK) { > + if (gh_error != GH_ERROR_MSGQUEUE_EMPTY) > + dev_warn(msgq->mbox.dev, "Failed to receive data: %d\n", gh_error); > + break; > + } > + if (likely(gh_msgq_chan(msgq)->cl)) > + mbox_chan_received_data(gh_msgq_chan(msgq), &rx_data); > + } > + > + return IRQ_HANDLED; > +} > + > +/* Fired when message queue transitions from "full" to "space available" to send messages */ > +static irqreturn_t gh_msgq_tx_irq_handler(int irq, void *data) > +{ > + struct gh_msgq *msgq = data; > + > + mbox_chan_txdone(gh_msgq_chan(msgq), 0); > + > + return IRQ_HANDLED; > +} > + > +/* Fired after sending message and hypercall told us there was more space available. */ > +static void gh_msgq_txdone_tasklet(struct tasklet_struct *tasklet) > +{ > + struct gh_msgq *msgq = container_of(tasklet, struct gh_msgq, txdone_tasklet); > + > + mbox_chan_txdone(gh_msgq_chan(msgq), msgq->last_ret); > +} > + > +static int gh_msgq_send_data(struct mbox_chan *chan, void *data) > +{ > + struct gh_msgq *msgq = mbox_chan_to_msgq(chan); > + struct gh_msgq_tx_data *msgq_data = data; > + u64 tx_flags = 0; > + enum gh_error gh_error; > + bool ready; > + > + if (!msgq->tx_ghrsc) > + return -EOPNOTSUPP; > + > + if (msgq_data->push) > + tx_flags |= GH_HYPERCALL_MSGQ_TX_FLAGS_PUSH; > + > + gh_error = gh_hypercall_msgq_send(msgq->tx_ghrsc->capid, msgq_data->length, msgq_data->data, > + tx_flags, &ready); > + > + /** > + * unlikely because Linux tracks state of msgq and should not try to > + * send message when msgq is full. > + */ > + if (unlikely(gh_error == GH_ERROR_MSGQUEUE_FULL)) > + return -EAGAIN; > + > + /** > + * Propagate all other errors to client. If we return error to mailbox > + * framework, then no other messages can be sent and nobody will know > + * to retry this message. > + */ > + msgq->last_ret = gh_error_remap(gh_error); > + > + /** > + * This message was successfully sent, but message queue isn't ready to > + * accept more messages because it's now full. Mailbox framework > + * requires that we only report that message was transmitted when > + * we're ready to transmit another message. We'll get that in the form > + * of tx IRQ once the other side starts to drain the msgq. > + */ > + if (gh_error == GH_ERROR_OK) { > + if (!ready) > + return 0; > + } else Standard style would add curly braces to the else block. } else { > + dev_err(msgq->mbox.dev, "Failed to send data: %d (%d)\n", gh_error, msgq->last_ret); > + > + /** > + * We can send more messages. Mailbox framework requires that tx done > + * happens asynchronously to sending the message. Gunyah message queues > + * tell us right away on the hypercall return whether we can send more > + * messages. To work around this, defer the txdone to a tasklet. > + */ > + tasklet_schedule(&msgq->txdone_tasklet); > + > + return 0; > +} . . . _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel