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authorLina Iyer <ilina@codeaurora.org>2018-06-20 18:57:05 +0530
committerAndy Gross <andy.gross@linaro.org>2018-07-21 13:33:27 -0500
commit564b5e24ccd4c840a7f84dfd952e5715dd9b3966 (patch)
tree63a2a1d5c80d7db7c0cc350f4512a0efb6f7365f /drivers/soc
parent600513dfeef33cb05c694d1b13d319b9e8cde536 (diff)
downloadlinux-564b5e24ccd4c840a7f84dfd952e5715dd9b3966.tar.bz2
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>
Diffstat (limited to 'drivers/soc')
-rw-r--r--drivers/soc/qcom/rpmh-internal.h2
-rw-r--r--drivers/soc/qcom/rpmh.c51
2 files changed, 53 insertions, 0 deletions
diff --git a/drivers/soc/qcom/rpmh-internal.h b/drivers/soc/qcom/rpmh-internal.h
index 101145c9db1c..6a8a4b7aeead 100644
--- a/drivers/soc/qcom/rpmh-internal.h
+++ b/drivers/soc/qcom/rpmh-internal.h
@@ -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;
};
/**
diff --git a/drivers/soc/qcom/rpmh.c b/drivers/soc/qcom/rpmh.c
index c355ba13e73f..1e3d34876af1 100644
--- a/drivers/soc/qcom/rpmh.c
+++ b/drivers/soc/qcom/rpmh.c
@@ -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
*