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Message-ID: <CAOgh=Fx5gAEFKnmsrgfOQWP13ZTKmwkhvUj0jSbyxhWisCumFA@mail.gmail.com>
Date: Tue, 28 Mar 2023 14:37:24 +0100
From: Eric Curtin <ecurtin@...hat.com>
To: Hector Martin <marcan@...can.st>
Cc: Sven Peter <sven@...npeter.dev>,
Alyssa Rosenzweig <alyssa@...enzweig.io>,
Jassi Brar <jassisinghbrar@...il.com>,
Janne Grunau <j@...nau.net>, linux-kernel@...r.kernel.org,
asahi@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 3/5] soc: apple: rtkit: Port to the internal mailbox driver
On Tue, 28 Mar 2023 at 14:21, Hector Martin <marcan@...can.st> wrote:
>
> Now that we have a mailbox driver in drivers/soc/apple, port the RTKit
> code to it. This mostly just entails replacing calls through the mailbox
> subsystem with direct calls into the driver.
>
> Signed-off-by: Hector Martin <marcan@...can.st>
Watched the stream
Acked-by: Eric Curtin <ecurtin@...hat.com>
Is mise le meas/Regards,
Eric Curtin
> ---
> drivers/soc/apple/Kconfig | 2 +-
> drivers/soc/apple/rtkit-internal.h | 8 +--
> drivers/soc/apple/rtkit.c | 101 ++++++++++---------------------------
> 3 files changed, 31 insertions(+), 80 deletions(-)
>
> diff --git a/drivers/soc/apple/Kconfig b/drivers/soc/apple/Kconfig
> index caa2cf09ff7a..d0e29bbd8c6f 100644
> --- a/drivers/soc/apple/Kconfig
> +++ b/drivers/soc/apple/Kconfig
> @@ -33,7 +33,7 @@ config APPLE_MBOX
>
> config APPLE_RTKIT
> tristate "Apple RTKit co-processor IPC protocol"
> - depends on MAILBOX
> + depends on APPLE_MBOX
> depends on ARCH_APPLE || COMPILE_TEST
> default ARCH_APPLE
> help
> diff --git a/drivers/soc/apple/rtkit-internal.h b/drivers/soc/apple/rtkit-internal.h
> index 24bd619ec5e4..27c9fa745fd5 100644
> --- a/drivers/soc/apple/rtkit-internal.h
> +++ b/drivers/soc/apple/rtkit-internal.h
> @@ -7,18 +7,17 @@
> #ifndef _APPLE_RTKIT_INTERAL_H
> #define _APPLE_RTKIT_INTERAL_H
>
> -#include <linux/apple-mailbox.h>
> #include <linux/bitfield.h>
> #include <linux/bitmap.h>
> #include <linux/completion.h>
> #include <linux/dma-mapping.h>
> #include <linux/io.h>
> #include <linux/kernel.h>
> -#include <linux/mailbox_client.h>
> #include <linux/module.h>
> #include <linux/slab.h>
> #include <linux/soc/apple/rtkit.h>
> #include <linux/workqueue.h>
> +#include "mailbox.h"
>
> #define APPLE_RTKIT_APP_ENDPOINT_START 0x20
> #define APPLE_RTKIT_MAX_ENDPOINTS 0x100
> @@ -28,10 +27,7 @@ struct apple_rtkit {
> const struct apple_rtkit_ops *ops;
> struct device *dev;
>
> - const char *mbox_name;
> - int mbox_idx;
> - struct mbox_client mbox_cl;
> - struct mbox_chan *mbox_chan;
> + struct apple_mbox *mbox;
>
> struct completion epmap_completion;
> struct completion iop_pwr_ack_completion;
> diff --git a/drivers/soc/apple/rtkit.c b/drivers/soc/apple/rtkit.c
> index 7c9b9f25bbc1..e6d940292c9f 100644
> --- a/drivers/soc/apple/rtkit.c
> +++ b/drivers/soc/apple/rtkit.c
> @@ -72,11 +72,6 @@ enum {
> #define APPLE_RTKIT_MIN_SUPPORTED_VERSION 11
> #define APPLE_RTKIT_MAX_SUPPORTED_VERSION 12
>
> -struct apple_rtkit_msg {
> - struct completion *completion;
> - struct apple_mbox_msg mbox_msg;
> -};
> -
> struct apple_rtkit_rx_work {
> struct apple_rtkit *rtk;
> u8 ep;
> @@ -550,12 +545,12 @@ static void apple_rtkit_rx_work(struct work_struct *work)
> kfree(rtk_work);
> }
>
> -static void apple_rtkit_rx(struct mbox_client *cl, void *mssg)
> +static void apple_rtkit_rx(struct apple_mbox *mbox, struct apple_mbox_msg msg,
> + void *cookie)
> {
> - struct apple_rtkit *rtk = container_of(cl, struct apple_rtkit, mbox_cl);
> - struct apple_mbox_msg *msg = mssg;
> + struct apple_rtkit *rtk = cookie;
> struct apple_rtkit_rx_work *work;
> - u8 ep = msg->msg1;
> + u8 ep = msg.msg1;
>
> /*
> * The message was read from a MMIO FIFO and we have to make
> @@ -571,7 +566,7 @@ static void apple_rtkit_rx(struct mbox_client *cl, void *mssg)
>
> if (ep >= APPLE_RTKIT_APP_ENDPOINT_START &&
> rtk->ops->recv_message_early &&
> - rtk->ops->recv_message_early(rtk->cookie, ep, msg->msg0))
> + rtk->ops->recv_message_early(rtk->cookie, ep, msg.msg0))
> return;
>
> work = kzalloc(sizeof(*work), GFP_ATOMIC);
> @@ -580,30 +575,18 @@ static void apple_rtkit_rx(struct mbox_client *cl, void *mssg)
>
> work->rtk = rtk;
> work->ep = ep;
> - work->msg = msg->msg0;
> + work->msg = msg.msg0;
> INIT_WORK(&work->work, apple_rtkit_rx_work);
> queue_work(rtk->wq, &work->work);
> }
>
> -static void apple_rtkit_tx_done(struct mbox_client *cl, void *mssg, int r)
> -{
> - struct apple_rtkit_msg *msg =
> - container_of(mssg, struct apple_rtkit_msg, mbox_msg);
> -
> - if (r == -ETIME)
> - return;
> -
> - if (msg->completion)
> - complete(msg->completion);
> - kfree(msg);
> -}
> -
> int apple_rtkit_send_message(struct apple_rtkit *rtk, u8 ep, u64 message,
> struct completion *completion, bool atomic)
> {
> - struct apple_rtkit_msg *msg;
> - int ret;
> - gfp_t flags;
> + struct apple_mbox_msg msg = {
> + .msg0 = message,
> + .msg1 = ep,
> + };
>
> if (rtk->crashed)
> return -EINVAL;
> @@ -611,19 +594,6 @@ int apple_rtkit_send_message(struct apple_rtkit *rtk, u8 ep, u64 message,
> !apple_rtkit_is_running(rtk))
> return -EINVAL;
>
> - if (atomic)
> - flags = GFP_ATOMIC;
> - else
> - flags = GFP_KERNEL;
> -
> - msg = kzalloc(sizeof(*msg), flags);
> - if (!msg)
> - return -ENOMEM;
> -
> - msg->mbox_msg.msg0 = message;
> - msg->mbox_msg.msg1 = ep;
> - msg->completion = completion;
> -
> /*
> * The message will be sent with a MMIO write. We need the barrier
> * here to ensure any previous writes to buffers are visible to the
> @@ -631,19 +601,13 @@ int apple_rtkit_send_message(struct apple_rtkit *rtk, u8 ep, u64 message,
> */
> dma_wmb();
>
> - ret = mbox_send_message(rtk->mbox_chan, &msg->mbox_msg);
> - if (ret < 0) {
> - kfree(msg);
> - return ret;
> - }
> -
> - return 0;
> + return apple_mbox_send(rtk->mbox, msg, atomic);
> }
> EXPORT_SYMBOL_GPL(apple_rtkit_send_message);
>
> int apple_rtkit_poll(struct apple_rtkit *rtk)
> {
> - return mbox_client_peek_data(rtk->mbox_chan);
> + return apple_mbox_poll(rtk->mbox);
> }
> EXPORT_SYMBOL_GPL(apple_rtkit_poll);
>
> @@ -665,20 +629,6 @@ int apple_rtkit_start_ep(struct apple_rtkit *rtk, u8 endpoint)
> }
> EXPORT_SYMBOL_GPL(apple_rtkit_start_ep);
>
> -static int apple_rtkit_request_mbox_chan(struct apple_rtkit *rtk)
> -{
> - if (rtk->mbox_name)
> - rtk->mbox_chan = mbox_request_channel_byname(&rtk->mbox_cl,
> - rtk->mbox_name);
> - else
> - rtk->mbox_chan =
> - mbox_request_channel(&rtk->mbox_cl, rtk->mbox_idx);
> -
> - if (IS_ERR(rtk->mbox_chan))
> - return PTR_ERR(rtk->mbox_chan);
> - return 0;
> -}
> -
> struct apple_rtkit *apple_rtkit_init(struct device *dev, void *cookie,
> const char *mbox_name, int mbox_idx,
> const struct apple_rtkit_ops *ops)
> @@ -704,13 +654,18 @@ struct apple_rtkit *apple_rtkit_init(struct device *dev, void *cookie,
> bitmap_zero(rtk->endpoints, APPLE_RTKIT_MAX_ENDPOINTS);
> set_bit(APPLE_RTKIT_EP_MGMT, rtk->endpoints);
>
> - rtk->mbox_name = mbox_name;
> - rtk->mbox_idx = mbox_idx;
> - rtk->mbox_cl.dev = dev;
> - rtk->mbox_cl.tx_block = false;
> - rtk->mbox_cl.knows_txdone = false;
> - rtk->mbox_cl.rx_callback = &apple_rtkit_rx;
> - rtk->mbox_cl.tx_done = &apple_rtkit_tx_done;
> + if (mbox_name)
> + rtk->mbox = apple_mbox_get_byname(dev, mbox_name);
> + else
> + rtk->mbox = apple_mbox_get(dev, mbox_idx);
> +
> + if (IS_ERR(rtk->mbox)) {
> + ret = PTR_ERR(rtk->mbox);
> + goto free_rtk;
> + }
> +
> + rtk->mbox->rx = apple_rtkit_rx;
> + rtk->mbox->cookie = rtk;
>
> rtk->wq = alloc_ordered_workqueue("rtkit-%s", WQ_MEM_RECLAIM,
> dev_name(rtk->dev));
> @@ -719,7 +674,7 @@ struct apple_rtkit *apple_rtkit_init(struct device *dev, void *cookie,
> goto free_rtk;
> }
>
> - ret = apple_rtkit_request_mbox_chan(rtk);
> + ret = apple_mbox_start(rtk->mbox);
> if (ret)
> goto destroy_wq;
>
> @@ -750,7 +705,7 @@ static int apple_rtkit_wait_for_completion(struct completion *c)
> int apple_rtkit_reinit(struct apple_rtkit *rtk)
> {
> /* make sure we don't handle any messages while reinitializing */
> - mbox_free_channel(rtk->mbox_chan);
> + apple_mbox_stop(rtk->mbox);
> flush_workqueue(rtk->wq);
>
> apple_rtkit_free_buffer(rtk, &rtk->ioreport_buffer);
> @@ -774,7 +729,7 @@ int apple_rtkit_reinit(struct apple_rtkit *rtk)
> rtk->iop_power_state = APPLE_RTKIT_PWR_STATE_OFF;
> rtk->ap_power_state = APPLE_RTKIT_PWR_STATE_OFF;
>
> - return apple_rtkit_request_mbox_chan(rtk);
> + return apple_mbox_start(rtk->mbox);
> }
> EXPORT_SYMBOL_GPL(apple_rtkit_reinit);
>
> @@ -930,7 +885,7 @@ EXPORT_SYMBOL_GPL(apple_rtkit_wake);
>
> void apple_rtkit_free(struct apple_rtkit *rtk)
> {
> - mbox_free_channel(rtk->mbox_chan);
> + apple_mbox_stop(rtk->mbox);
> destroy_workqueue(rtk->wq);
>
> apple_rtkit_free_buffer(rtk, &rtk->ioreport_buffer);
>
> --
> 2.40.0
>
>
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