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Lin" , Singo Chang , "Nancy Lin" , , , , Subject: [PATCH 1/2] mailbox: Add power_get/power_put API to mbox_chan_ops Date: Fri, 14 Jun 2024 12:01:32 +0800 Message-ID: <20240614040133.24967-2-jason-jh.lin@mediatek.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20240614040133.24967-1-jason-jh.lin@mediatek.com> References: <20240614040133.24967-1-jason-jh.lin@mediatek.com> MIME-Version: 1.0 X-TM-AS-Product-Ver: SMEX-14.0.0.3152-9.1.1006-23728.005 X-TM-AS-Result: No-10--5.890200-8.000000 X-TMASE-MatchedRID: +MT4sN6PwkkpDniSMR+7FVz+axQLnAVBsuIso71Vk6Is/uUAk6xP7PlY oV6p/cSxYZon4ysgRFozZkzSKaTDyzWBtSWZ+bE6tw+xHnsmQjM2UosmN5oMuL/A+0D1to6PddB i3uMAVYvJpEwYgGDKGNWPKFYziUDIOVzKEd+ERcpIcJTn2HkqsTtSuYjPEOig2+mPn502VC/Irl nIALCsEkeSgWObrJ9MSHd+RjLgi2MYB2fOueQzjxRFJJyf5BJe3QfwsVk0UbtuRXh7bFKB7lnBE Jr8G5ea7U/yd1J/CA0ZGZ1zIaaRD2avzr9xB9L8aAZk0sEcY14= X-TM-AS-User-Approved-Sender: No X-TM-AS-User-Blocked-Sender: No X-TMASE-Result: 10--5.890200-8.000000 X-TMASE-Version: SMEX-14.0.0.3152-9.1.1006-23728.005 X-TM-SNTS-SMTP: BF68BF4C9A3210864A913116E970F109AD5F2EDC8CDFB3354B6315FD3C8B6D502000:8 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240613_210216_297071_C1407671 X-CRM114-Status: GOOD ( 15.86 ) 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org To avoid pm_runtime APIs calling sleep in all the atomic context APIs in mbox_chan_ops, we add power_get/power_put API to let the controllers implement them with pm_runtime APIs outside the other atomic context APIs in mbox_chan_ops. Signed-off-by: Jason-JH.Lin --- drivers/mailbox/mailbox.c | 55 ++++++++++++++++++++++++++++++ include/linux/mailbox_controller.h | 11 ++++++ 2 files changed, 66 insertions(+) diff --git a/drivers/mailbox/mailbox.c b/drivers/mailbox/mailbox.c index ebff3baf3045..bafcc7b0c0b8 100644 --- a/drivers/mailbox/mailbox.c +++ b/drivers/mailbox/mailbox.c @@ -58,6 +58,12 @@ static void msg_submit(struct mbox_chan *chan) void *data; int err = -EBUSY; + if (chan->mbox->ops->power_get) { + err = chan->mbox->ops->power_get(chan); + if (err < 0) + return; + } + spin_lock_irqsave(&chan->lock, flags); if (!chan->msg_count || chan->active_req) @@ -89,12 +95,16 @@ static void msg_submit(struct mbox_chan *chan) hrtimer_start(&chan->mbox->poll_hrt, 0, HRTIMER_MODE_REL); spin_unlock_irqrestore(&chan->mbox->poll_hrt_lock, flags); } + + if (chan->mbox->ops->power_put) + chan->mbox->ops->power_put(chan); } static void tx_tick(struct mbox_chan *chan, int r) { unsigned long flags; void *mssg; + int ret; spin_lock_irqsave(&chan->lock, flags); mssg = chan->active_req; @@ -107,10 +117,19 @@ static void tx_tick(struct mbox_chan *chan, int r) if (!mssg) return; + if (chan->mbox->ops->power_get) { + ret = chan->mbox->ops->power_get(chan); + if (ret < 0) + return; + } + /* Notify the client */ if (chan->cl->tx_done) chan->cl->tx_done(chan->cl, mssg, r); + if (chan->mbox->ops->power_put) + chan->mbox->ops->power_put(chan); + if (r != -ETIME && chan->cl->tx_block) complete(&chan->tx_complete); } @@ -223,9 +242,16 @@ EXPORT_SYMBOL_GPL(mbox_client_txdone); */ bool mbox_client_peek_data(struct mbox_chan *chan) { + if (chan->mbox->ops->power_get) + if (chan->mbox->ops->power_get(chan) < 0) + return false; + if (chan->mbox->ops->peek_data) return chan->mbox->ops->peek_data(chan); + if (chan->mbox->ops->power_put) + chan->mbox->ops->power_put(chan); + return false; } EXPORT_SYMBOL_GPL(mbox_client_peek_data); @@ -310,10 +336,19 @@ int mbox_flush(struct mbox_chan *chan, unsigned long timeout) if (!chan->mbox->ops->flush) return -ENOTSUPP; + if (chan->mbox->ops->power_get) { + ret = chan->mbox->ops->power_get(chan); + if (ret < 0) + return ret; + } + ret = chan->mbox->ops->flush(chan, timeout); if (ret < 0) tx_tick(chan, ret); + if (chan->mbox->ops->power_put) + chan->mbox->ops->power_put(chan); + return ret; } EXPORT_SYMBOL_GPL(mbox_flush); @@ -341,6 +376,12 @@ static int __mbox_bind_client(struct mbox_chan *chan, struct mbox_client *cl) spin_unlock_irqrestore(&chan->lock, flags); + if (chan->mbox->ops->power_get) { + ret = chan->mbox->ops->power_get(chan); + if (ret < 0) + return ERR_PTR(ret); + } + if (chan->mbox->ops->startup) { ret = chan->mbox->ops->startup(chan); @@ -441,7 +482,11 @@ struct mbox_chan *mbox_request_channel(struct mbox_client *cl, int index) if (ret) chan = ERR_PTR(ret); + if (chan->mbox->ops->power_put) + chan->mbox->ops->power_put(chan); + mutex_unlock(&con_mutex); + return chan; } EXPORT_SYMBOL_GPL(mbox_request_channel); @@ -485,13 +530,23 @@ EXPORT_SYMBOL_GPL(mbox_request_channel_byname); void mbox_free_channel(struct mbox_chan *chan) { unsigned long flags; + int ret; if (!chan || !chan->cl) return; + if (chan->mbox->ops->power_get) { + ret = chan->mbox->ops->power_get(chan); + if (ret < 0) + return; + } + if (chan->mbox->ops->shutdown) chan->mbox->ops->shutdown(chan); + if (chan->mbox->ops->power_put) + chan->mbox->ops->power_put(chan); + /* The queued TX requests are simply aborted, no callbacks are made */ spin_lock_irqsave(&chan->lock, flags); chan->cl = NULL; diff --git a/include/linux/mailbox_controller.h b/include/linux/mailbox_controller.h index 6fee33cb52f5..e8f26e7dabfd 100644 --- a/include/linux/mailbox_controller.h +++ b/include/linux/mailbox_controller.h @@ -42,6 +42,15 @@ struct mbox_chan; * Used only if txdone_poll:=true && txdone_irq:=false * @peek_data: Atomic check for any received data. Return true if controller * has some data to push to the client. False otherwise. + * @power_get: Called when the controller need to get the reference to keep + * the power on for the device of mailbox controller. It is + * optional to implement this function with pm_runtime APIs or + * more complicated operation. + * Return 0 is success, otherwise are fail. + * @power_put: Called when the controller need to put the reference to release + * the power for the device of mailbox controller. It is optional + * to implement this function with pm_runtime APIs or more + * complicated operation. */ struct mbox_chan_ops { int (*send_data)(struct mbox_chan *chan, void *data); @@ -50,6 +59,8 @@ struct mbox_chan_ops { void (*shutdown)(struct mbox_chan *chan); bool (*last_tx_done)(struct mbox_chan *chan); bool (*peek_data)(struct mbox_chan *chan); + int (*power_get)(struct mbox_chan *chan); + void (*power_put)(struct mbox_chan *chan); }; /**