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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/drivers/soc/qcom/rpmh.c
..
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@@ -9,6 +9,7 @@
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9
 #include <linux/jiffies.h>
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 #include <linux/kernel.h>
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11
 #include <linux/list.h>
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+#include <linux/lockdep.h>
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 #include <linux/module.h>
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 #include <linux/of.h>
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 #include <linux/platform_device.h>
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@@ -23,7 +24,7 @@
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24
 
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 #define RPMH_TIMEOUT_MS			msecs_to_jiffies(10000)
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26
 
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-#define DEFINE_RPMH_MSG_ONSTACK(dev, s, q, name)	\
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+#define DEFINE_RPMH_MSG_ONSTACK(device, s, q, name)	\
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 	struct rpmh_request name = {			\
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 		.msg = {				\
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 			.state = s,			\
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@@ -33,7 +34,7 @@
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 		},					\
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 		.cmd = { { 0 } },			\
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 		.completion = q,			\
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-		.dev = dev,				\
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+		.dev = device,				\
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 		.needs_free = false,				\
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 	}
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40
 
..
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@@ -195,9 +196,8 @@
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 		WARN_ON(irqs_disabled());
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 		ret = rpmh_rsc_send_data(ctrlr_to_drv(ctrlr), &rpm_msg->msg);
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 	} else {
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-		ret = rpmh_rsc_write_ctrl_data(ctrlr_to_drv(ctrlr),
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-				&rpm_msg->msg);
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 		/* Clean up our call by spoofing tx_done */
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+		ret = 0;
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 		rpmh_tx_done(&rpm_msg->msg, ret);
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 	}
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203
 
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@@ -298,12 +298,10 @@
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 {
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 	struct batch_cache_req *req;
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 	const struct rpmh_request *rpm_msg;
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-	unsigned long flags;
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 	int ret = 0;
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 	int i;
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303
 
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 	/* Send Sleep/Wake requests to the controller, expect no response */
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-	spin_lock_irqsave(&ctrlr->cache_lock, flags);
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 	list_for_each_entry(req, &ctrlr->batch_cache, list) {
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 		for (i = 0; i < req->count; i++) {
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 			rpm_msg = req->rpm_msgs + i;
..
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@@ -313,7 +311,6 @@
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 				break;
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 		}
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 	}
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-	spin_unlock_irqrestore(&ctrlr->cache_lock, flags);
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314
 
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 	return ret;
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 }
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@@ -419,11 +416,10 @@
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 		req->sleep_val != req->wake_val);
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 }
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418
 
422
-static int send_single(const struct device *dev, enum rpmh_state state,
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+static int send_single(struct rpmh_ctrlr *ctrlr, enum rpmh_state state,
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420
 		       u32 addr, u32 data)
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421
 {
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-	DEFINE_RPMH_MSG_ONSTACK(dev, state, NULL, rpm_msg);
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-	struct rpmh_ctrlr *ctrlr = get_rpmh_ctrlr(dev);
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+	DEFINE_RPMH_MSG_ONSTACK(NULL, state, NULL, rpm_msg);
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423
 
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 	/* Wake sets are always complete and sleep sets are not */
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 	rpm_msg.msg.wait_for_compl = (state == RPMH_WAKE_ONLY_STATE);
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@@ -435,64 +431,64 @@
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 }
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432
 
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 /**
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- * rpmh_flush: Flushes the buffered active and sleep sets to TCS
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+ * rpmh_flush() - Flushes the buffered sleep and wake sets to TCSes
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  *
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- * @dev: The device making the request
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+ * @ctrlr: Controller making request to flush cached data
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  *
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- * Return: -EBUSY if the controller is busy, probably waiting on a response
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- * to a RPMH request sent earlier.
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- *
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- * This function is always called from the sleep code from the last CPU
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- * that is powering down the entire system. Since no other RPMH API would be
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- * executing at this time, it is safe to run lockless.
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+ * Return:
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+ * * 0          - Success
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+ * * Error code - Otherwise
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  */
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-int rpmh_flush(const struct device *dev)
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+int rpmh_flush(struct rpmh_ctrlr *ctrlr)
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 {
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 	struct cache_req *p;
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-	struct rpmh_ctrlr *ctrlr = get_rpmh_ctrlr(dev);
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-	int ret;
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+	int ret = 0;
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+
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+	lockdep_assert_irqs_disabled();
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+
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+	/*
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+	 * Currently rpmh_flush() is only called when we think we're running
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+	 * on the last processor.  If the lock is busy it means another
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+	 * processor is up and it's better to abort than spin.
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+	 */
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+	if (!spin_trylock(&ctrlr->cache_lock))
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+		return -EBUSY;
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456
 
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 	if (!ctrlr->dirty) {
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 		pr_debug("Skipping flush, TCS has latest data.\n");
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-		return 0;
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+		goto exit;
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 	}
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461
 
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 	/* Invalidate the TCSes first to avoid stale data */
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-	do {
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-		ret = rpmh_rsc_invalidate(ctrlr_to_drv(ctrlr));
463
-	} while (ret == -EAGAIN);
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-	if (ret)
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-		return ret;
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+	rpmh_rsc_invalidate(ctrlr_to_drv(ctrlr));
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464
 
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 	/* First flush the cached batch requests */
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 	ret = flush_batch(ctrlr);
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 	if (ret)
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-		return ret;
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+		goto exit;
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-	/*
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-	 * Nobody else should be calling this function other than system PM,
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-	 * hence we can run without locks.
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-	 */
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 	list_for_each_entry(p, &ctrlr->cache, list) {
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 		if (!is_req_valid(p)) {
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 			pr_debug("%s: skipping RPMH req: a:%#x s:%#x w:%#x",
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 				 __func__, p->addr, p->sleep_val, p->wake_val);
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 			continue;
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 		}
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-		ret = send_single(dev, RPMH_SLEEP_STATE, p->addr, p->sleep_val);
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+		ret = send_single(ctrlr, RPMH_SLEEP_STATE, p->addr,
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+				  p->sleep_val);
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 		if (ret)
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-			return ret;
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-		ret = send_single(dev, RPMH_WAKE_ONLY_STATE,
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-				  p->addr, p->wake_val);
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+			goto exit;
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+		ret = send_single(ctrlr, RPMH_WAKE_ONLY_STATE, p->addr,
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+				  p->wake_val);
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 		if (ret)
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-			return ret;
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+			goto exit;
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 	}
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485
 
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 	ctrlr->dirty = false;
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487
 
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-	return 0;
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+exit:
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+	spin_unlock(&ctrlr->cache_lock);
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+	return ret;
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491
 }
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-EXPORT_SYMBOL(rpmh_flush);
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492
 
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 /**
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  * rpmh_invalidate: Invalidate sleep and wake sets in batch_cache
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@@ -501,7 +497,7 @@
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  *
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  * Invalidate the sleep and wake values in batch_cache.
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499
  */
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-int rpmh_invalidate(const struct device *dev)
500
+void rpmh_invalidate(const struct device *dev)
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 {
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 	struct rpmh_ctrlr *ctrlr = get_rpmh_ctrlr(dev);
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 	struct batch_cache_req *req, *tmp;
..
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@@ -513,7 +509,5 @@
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 	INIT_LIST_HEAD(&ctrlr->batch_cache);
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 	ctrlr->dirty = true;
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 	spin_unlock_irqrestore(&ctrlr->cache_lock, flags);
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-
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-	return 0;
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 }
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 EXPORT_SYMBOL(rpmh_invalidate);