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: Lina Iyer <ilina@codeaurora.org> Signed-off-by: Raju P.L.S.S.S.N <rplsssn@codeaurora.org> Signed-off-by: Andy Gross <andy.gross@linaro.org>
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Коммит
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@ -54,6 +54,7 @@ struct tcs_group {
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* @completion: triggered when request is done
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* @dev: the device making the request
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* @err: err return from the controller
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* @needs_free: check to free dynamically allocated request object
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*/
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struct rpmh_request {
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struct tcs_request msg;
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@ -61,6 +62,7 @@ struct rpmh_request {
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struct completion *completion;
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const struct device *dev;
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int err;
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bool needs_free;
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};
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/**
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@ -34,6 +34,7 @@
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.cmd = { { 0 } }, \
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.completion = q, \
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.dev = dev, \
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.needs_free = false, \
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}
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#define ctrlr_to_drv(ctrlr) container_of(ctrlr, struct rsc_drv, client)
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@ -75,6 +76,9 @@ void rpmh_tx_done(const struct tcs_request *msg, int r)
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/* Signal the blocking thread we are done */
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if (compl)
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complete(compl);
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if (rpm_msg->needs_free)
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kfree(rpm_msg);
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}
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static struct cache_req *__find_req(struct rpmh_ctrlr *ctrlr, u32 addr)
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@ -180,6 +184,53 @@ static int __rpmh_write(const struct device *dev, enum rpmh_state state,
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return ret;
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}
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static int __fill_rpmh_msg(struct rpmh_request *req, enum rpmh_state state,
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const struct tcs_cmd *cmd, u32 n)
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{
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if (!cmd || !n || n > MAX_RPMH_PAYLOAD)
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return -EINVAL;
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memcpy(req->cmd, cmd, n * sizeof(*cmd));
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req->msg.state = state;
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req->msg.cmds = req->cmd;
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req->msg.num_cmds = n;
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return 0;
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}
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/**
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* rpmh_write_async: Write a set of RPMH commands
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*
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* @dev: The device making the request
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* @state: Active/sleep set
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* @cmd: The payload data
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* @n: The number of elements in payload
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*
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* Write a set of RPMH commands, the order of commands is maintained
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* and will be sent as a single shot.
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*/
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int rpmh_write_async(const struct device *dev, enum rpmh_state state,
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const struct tcs_cmd *cmd, u32 n)
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{
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struct rpmh_request *rpm_msg;
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int ret;
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rpm_msg = kzalloc(sizeof(*rpm_msg), GFP_ATOMIC);
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if (!rpm_msg)
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return -ENOMEM;
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rpm_msg->needs_free = true;
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ret = __fill_rpmh_msg(rpm_msg, state, cmd, n);
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if (ret) {
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kfree(rpm_msg);
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return ret;
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}
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return __rpmh_write(dev, state, rpm_msg);
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}
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EXPORT_SYMBOL(rpmh_write_async);
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/**
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* rpmh_write: Write a set of RPMH commands and block until response
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*
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@ -14,6 +14,9 @@
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int rpmh_write(const struct device *dev, enum rpmh_state state,
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const struct tcs_cmd *cmd, u32 n);
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int rpmh_write_async(const struct device *dev, enum rpmh_state state,
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const struct tcs_cmd *cmd, u32 n);
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int rpmh_flush(const struct device *dev);
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int rpmh_invalidate(const struct device *dev);
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@ -24,6 +27,10 @@ static inline int rpmh_write(const struct device *dev, enum rpmh_state state,
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const struct tcs_cmd *cmd, u32 n)
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{ return -ENODEV; }
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static inline int rpmh_write_async(const struct device *dev,
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enum rpmh_state state,
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const struct tcs_cmd *cmd, u32 n)
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{ return -ENODEV; }
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static inline int rpmh_flush(const struct device *dev)
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{ return -ENODEV; }
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