Commit 564b5e24 authored by Lina Iyer's avatar Lina Iyer Committed by Andy Gross
Browse files

drivers: qcom: rpmh: allow requests to be sent asynchronously 



Platform drivers that want to send a request but do not want to block
until the RPMH request completes have now a new API -
rpmh_write_async().

The API allocates memory and send the requests and returns the control
back to the platform driver. The tx_done callback from the controller is
handled in the context of the controller's thread and frees the
allocated memory. This API allows RPMH requests from atomic contexts as
well.

Signed-off-by: default avatarLina Iyer <ilina@codeaurora.org>
Signed-off-by: default avatarRaju P.L.S.S.S.N <rplsssn@codeaurora.org>
Signed-off-by: default avatarAndy Gross <andy.gross@linaro.org>
parent 600513df

drivers/soc/qcom/rpmh-internal.h

+2 −0
Original line number Diff line number Diff line
@@ -54,6 +54,7 @@ struct tcs_group { 
 * @completion: triggered when request is done

 * @dev: the device making the request

 * @err: err return from the controller

 * @needs_free: check to free dynamically allocated request object

 */

struct rpmh_request {

	struct tcs_request msg;
@@ -61,6 +62,7 @@ struct rpmh_request { 
	struct completion *completion;

	const struct device *dev;

	int err;

	bool needs_free;

};



/**

drivers/soc/qcom/rpmh.c

+51 −0
Original line number Diff line number Diff line
@@ -34,6 +34,7 @@ 
		.cmd = { { 0 } },			\

		.completion = q,			\

		.dev = dev,				\

		.needs_free = false,				\

	}



#define ctrlr_to_drv(ctrlr) container_of(ctrlr, struct rsc_drv, client)
@@ -75,6 +76,9 @@ void rpmh_tx_done(const struct tcs_request *msg, int r) 
	/* Signal the blocking thread we are done */

	if (compl)

		complete(compl);



	if (rpm_msg->needs_free)

		kfree(rpm_msg);

}



static struct cache_req *__find_req(struct rpmh_ctrlr *ctrlr, u32 addr)
@@ -180,6 +184,53 @@ static int __rpmh_write(const struct device *dev, enum rpmh_state state, 
	return ret;

}



static int __fill_rpmh_msg(struct rpmh_request *req, enum rpmh_state state,

		const struct tcs_cmd *cmd, u32 n)

{

	if (!cmd || !n || n > MAX_RPMH_PAYLOAD)

		return -EINVAL;



	memcpy(req->cmd, cmd, n * sizeof(*cmd));



	req->msg.state = state;

	req->msg.cmds = req->cmd;

	req->msg.num_cmds = n;



	return 0;

}



/**

 * rpmh_write_async: Write a set of RPMH commands

 *

 * @dev: The device making the request

 * @state: Active/sleep set

 * @cmd: The payload data

 * @n: The number of elements in payload

 *

 * Write a set of RPMH commands, the order of commands is maintained

 * and will be sent as a single shot.

 */

int rpmh_write_async(const struct device *dev, enum rpmh_state state,

		     const struct tcs_cmd *cmd, u32 n)

{

	struct rpmh_request *rpm_msg;

	int ret;



	rpm_msg = kzalloc(sizeof(*rpm_msg), GFP_ATOMIC);

	if (!rpm_msg)

		return -ENOMEM;

	rpm_msg->needs_free = true;



	ret = __fill_rpmh_msg(rpm_msg, state, cmd, n);

	if (ret) {

		kfree(rpm_msg);

		return ret;

	}



	return __rpmh_write(dev, state, rpm_msg);

}

EXPORT_SYMBOL(rpmh_write_async);



/**

 * rpmh_write: Write a set of RPMH commands and block until response

 *

include/soc/qcom/rpmh.h

+7 −0
Original line number Diff line number Diff line
@@ -14,6 +14,9 @@ 
int rpmh_write(const struct device *dev, enum rpmh_state state,

	       const struct tcs_cmd *cmd, u32 n);



int rpmh_write_async(const struct device *dev, enum rpmh_state state,

		     const struct tcs_cmd *cmd, u32 n);



int rpmh_flush(const struct device *dev);



int rpmh_invalidate(const struct device *dev);
@@ -24,6 +27,10 @@ static inline int rpmh_write(const struct device *dev, enum rpmh_state state, 
			     const struct tcs_cmd *cmd, u32 n)

{ return -ENODEV; }



static inline int rpmh_write_async(const struct device *dev,

				   enum rpmh_state state,

				   const struct tcs_cmd *cmd, u32 n)

{ return -ENODEV; }



static inline int rpmh_flush(const struct device *dev)

{ return -ENODEV; }

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