linux-kernel - [PATCH] soc: apple: rtkit: Add a private pointer to apple_rtkit

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Message-Id: <20230121074253.9774-1-lina@asahilina.net>
Date:   Sat, 21 Jan 2023 16:42:53 +0900
From:   Asahi Lina <lina@...hilina.net>
To:     Hector Martin <marcan@...can.st>, Sven Peter <sven@...npeter.dev>
Cc:     Alyssa Rosenzweig <alyssa@...enzweig.io>, asahi@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Asahi Lina <lina@...hilina.net>
Subject: [PATCH] soc: apple: rtkit: Add a private pointer to apple_rtkit_shmem

This allows downstream consumers to keep track of private data for shmem
mappings. In particular, the Rust abstraction will use this to safely
drop data associated with a mapping when it is unmapped.

Signed-off-by: Asahi Lina <lina@...hilina.net>
---
 include/linux/soc/apple/rtkit.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/soc/apple/rtkit.h b/include/linux/soc/apple/rtkit.h
index 62bfa37b5adb..1a9888a1797a 100644
--- a/include/linux/soc/apple/rtkit.h
+++ b/include/linux/soc/apple/rtkit.h
@@ -22,6 +22,7 @@
  * @size:      Size of the shared memory buffer.
  * @iova:      Device VA of shared memory buffer.
  * @is_mapped: Shared memory buffer is managed by the co-processor.
+ * @private:   Private data pointer for the parent driver.
  */
 
 struct apple_rtkit_shmem {
@@ -30,6 +31,7 @@ struct apple_rtkit_shmem {
 	size_t size;
 	dma_addr_t iova;
 	bool is_mapped;
+	void *private;
 };
 
 /*
-- 
2.35.1