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>
This commit is contained in:
Lina Iyer 2018-06-20 18:57:05 +05:30 коммит произвёл Andy Gross
Родитель 600513dfee
Коммит 564b5e24cc
3 изменённых файлов: 60 добавлений и 0 удалений

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@ -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;
};
/**

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@ -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
*

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@ -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; }