FAILED: patch "[PATCH] idpf: fix PREEMPT_RT raw/bh spinlock nesting for async VC" failed to apply to 6.12-stable tree

index 113ecfc16dd7..582e0c8e9dc0 100644
@@ -287,26 +287,21 @@ int idpf_send_mb_msg(struct idpf_adapter *adapter, struct idpf_ctlq_info *asq,
 	return err;
 }
 
-/* API for virtchnl "transaction" support ("xn" for short).
- *
- * We are reusing the completion lock to serialize the accesses to the
- * transaction state for simplicity, but it could be its own separate synchro
- * as well. For now, this API is only used from within a workqueue context;
- * raw_spin_lock() is enough.
- */
+/* API for virtchnl "transaction" support ("xn" for short). */
+
 /**
  * idpf_vc_xn_lock - Request exclusive access to vc transaction
  * @xn: struct idpf_vc_xn* to access
  */
 #define idpf_vc_xn_lock(xn)			\
-	raw_spin_lock(&(xn)->completed.wait.lock)
+	spin_lock(&(xn)->lock)
 
 /**
  * idpf_vc_xn_unlock - Release exclusive access to vc transaction
  * @xn: struct idpf_vc_xn* to access
  */
 #define idpf_vc_xn_unlock(xn)		\
-	raw_spin_unlock(&(xn)->completed.wait.lock)
+	spin_unlock(&(xn)->lock)
 
 /**
  * idpf_vc_xn_release_bufs - Release reference to reply buffer(s) and

@@ -338,6 +333,7 @@ static void idpf_vc_xn_init(struct idpf_vc_xn_manager *vcxn_mngr)
 		xn->state = IDPF_VC_XN_IDLE;
 		xn->idx = i;
 		idpf_vc_xn_release_bufs(xn);
+		spin_lock_init(&xn->lock);
 		init_completion(&xn->completed);
 	}
 

index fe065911ad5a..6876e3ed9d1b 100644
@@ -42,8 +42,8 @@ typedef int (*async_vc_cb) (struct idpf_adapter *, struct idpf_vc_xn *,
  * struct idpf_vc_xn - Data structure representing virtchnl transactions
  * @completed: virtchnl event loop uses that to signal when a reply is
  *	       available, uses kernel completion API
- * @state: virtchnl event loop stores the data below, protected by the
- *	   completion's lock.
+ * @lock: protects the transaction state fields below
+ * @state: virtchnl event loop stores the data below, protected by @lock
  * @reply_sz: Original size of reply, may be > reply_buf.iov_len; it will be
  *	      truncated on its way to the receiver thread according to
  *	      reply_buf.iov_len.

@@ -58,6 +58,7 @@ typedef int (*async_vc_cb) (struct idpf_adapter *, struct idpf_vc_xn *,
  */
 struct idpf_vc_xn {
 	struct completion completed;
+	spinlock_t lock;
 	enum idpf_vc_xn_state state;
 	size_t reply_sz;
 	struct kvec reply;

index 3d80b53161a4..eeb4436ec2c9 100644
@@ -59,6 +59,7 @@ typedef int (*async_vc_cb) (struct idpf_adapter *, struct idpf_vc_xn *,
  */
 struct idpf_vc_xn {
 	struct completion completed;
+	spinlock_t lock;
 	enum idpf_vc_xn_state state;
 	size_t reply_sz;
 	struct kvec reply;

@@ -312,26 +313,21 @@ int idpf_send_mb_msg(struct idpf_adapter *adapter, u32 op,
 	return err;
 }
 
-/* API for virtchnl "transaction" support ("xn" for short).
- *
- * We are reusing the completion lock to serialize the accesses to the
- * transaction state for simplicity, but it could be its own separate synchro
- * as well. For now, this API is only used from within a workqueue context;
- * raw_spin_lock() is enough.
- */
+/* API for virtchnl "transaction" support ("xn" for short). */
+
 /**
  * idpf_vc_xn_lock - Request exclusive access to vc transaction
  * @xn: struct idpf_vc_xn* to access
  */
 #define idpf_vc_xn_lock(xn)			\
-	raw_spin_lock(&(xn)->completed.wait.lock)
+	spin_lock(&(xn)->lock)
 
 /**
  * idpf_vc_xn_unlock - Release exclusive access to vc transaction
  * @xn: struct idpf_vc_xn* to access
  */
 #define idpf_vc_xn_unlock(xn)		\
-	raw_spin_unlock(&(xn)->completed.wait.lock)
+	spin_unlock(&(xn)->lock)
 
 /**
  * idpf_vc_xn_release_bufs - Release reference to reply buffer(s) and

@@ -363,6 +359,7 @@ static void idpf_vc_xn_init(struct idpf_vc_xn_manager *vcxn_mngr)
 		xn->state = IDPF_VC_XN_IDLE;
 		xn->idx = i;
 		idpf_vc_xn_release_bufs(xn);
+		spin_lock_init(&xn->lock);
 		init_completion(&xn->completed);
 	}
 

index 3d80b53161a4c..946aca7a07681 100644
@@ -6,88 +6,6 @@
 #include "idpf.h"
 #include "idpf_virtchnl.h"
 
-#define IDPF_VC_XN_MIN_TIMEOUT_MSEC	2000
-#define IDPF_VC_XN_DEFAULT_TIMEOUT_MSEC	(60 * 1000)
-#define IDPF_VC_XN_IDX_M		GENMASK(7, 0)
-#define IDPF_VC_XN_SALT_M		GENMASK(15, 8)
-#define IDPF_VC_XN_RING_LEN		U8_MAX
-
-/**
- * enum idpf_vc_xn_state - Virtchnl transaction status
- * @IDPF_VC_XN_IDLE: not expecting a reply, ready to be used
- * @IDPF_VC_XN_WAITING: expecting a reply, not yet received
- * @IDPF_VC_XN_COMPLETED_SUCCESS: a reply was expected and received,
- *				  buffer updated
- * @IDPF_VC_XN_COMPLETED_FAILED: a reply was expected and received, but there
- *				 was an error, buffer not updated
- * @IDPF_VC_XN_SHUTDOWN: transaction object cannot be used, VC torn down
- * @IDPF_VC_XN_ASYNC: transaction sent asynchronously and doesn't have the
- *		      return context; a callback may be provided to handle
- *		      return
- */
-enum idpf_vc_xn_state {
-	IDPF_VC_XN_IDLE = 1,
-	IDPF_VC_XN_WAITING,
-	IDPF_VC_XN_COMPLETED_SUCCESS,
-	IDPF_VC_XN_COMPLETED_FAILED,
-	IDPF_VC_XN_SHUTDOWN,
-	IDPF_VC_XN_ASYNC,
-};
-
-struct idpf_vc_xn;
-/* Callback for asynchronous messages */
-typedef int (*async_vc_cb) (struct idpf_adapter *, struct idpf_vc_xn *,
-			    const struct idpf_ctlq_msg *);
-
-/**
- * struct idpf_vc_xn - Data structure representing virtchnl transactions
- * @completed: virtchnl event loop uses that to signal when a reply is
- *	       available, uses kernel completion API
- * @state: virtchnl event loop stores the data below, protected by the
- *	   completion's lock.
- * @reply_sz: Original size of reply, may be > reply_buf.iov_len; it will be
- *	      truncated on its way to the receiver thread according to
- *	      reply_buf.iov_len.
- * @reply: Reference to the buffer(s) where the reply data should be written
- *	   to. May be 0-length (then NULL address permitted) if the reply data
- *	   should be ignored.
- * @async_handler: if sent asynchronously, a callback can be provided to handle
- *		   the reply when it's received
- * @vc_op: corresponding opcode sent with this transaction
- * @idx: index used as retrieval on reply receive, used for cookie
- * @salt: changed every message to make unique, used for cookie
- */
-struct idpf_vc_xn {
-	struct completion completed;
-	enum idpf_vc_xn_state state;
-	size_t reply_sz;
-	struct kvec reply;
-	async_vc_cb async_handler;
-	u32 vc_op;
-	u8 idx;
-	u8 salt;
-};
-
-/**
- * struct idpf_vc_xn_params - Parameters for executing transaction
- * @send_buf: kvec for send buffer
- * @recv_buf: kvec for recv buffer, may be NULL, must then have zero length
- * @timeout_ms: timeout to wait for reply
- * @async: send message asynchronously, will not wait on completion
- * @async_handler: If sent asynchronously, optional callback handler. The user
- *		   must be careful when using async handlers as the memory for
- *		   the recv_buf _cannot_ be on stack if this is async.
- * @vc_op: virtchnl op to send
- */
-struct idpf_vc_xn_params {
-	struct kvec send_buf;
-	struct kvec recv_buf;
-	int timeout_ms;
-	bool async;
-	async_vc_cb async_handler;
-	u32 vc_op;
-};
-
 /**
  * struct idpf_vc_xn_manager - Manager for tracking transactions
  * @ring: backing and lookup for transactions

@@ -449,8 +367,8 @@ static void idpf_vc_xn_push_free(struct idpf_vc_xn_manager *vcxn_mngr,
  * >= @recv_buf.iov_len, but we never overflow @@recv_buf_iov_base). < 0 for
  * error.
  */
-static ssize_t idpf_vc_xn_exec(struct idpf_adapter *adapter,
-			       const struct idpf_vc_xn_params *params)
+ssize_t idpf_vc_xn_exec(struct idpf_adapter *adapter,
+			const struct idpf_vc_xn_params *params)
 {
 	const struct kvec *send_buf = &params->send_buf;
 	struct idpf_vc_xn *xn;

96 lines not on this page · raw message

index 946aca7a07681..d760d4585c1c3 100644
@@ -230,26 +230,21 @@ int idpf_send_mb_msg(struct idpf_adapter *adapter, u32 op,
 	return err;
 }
 
-/* API for virtchnl "transaction" support ("xn" for short).
- *
- * We are reusing the completion lock to serialize the accesses to the
- * transaction state for simplicity, but it could be its own separate synchro
- * as well. For now, this API is only used from within a workqueue context;
- * raw_spin_lock() is enough.
- */
+/* API for virtchnl "transaction" support ("xn" for short). */
+
 /**
  * idpf_vc_xn_lock - Request exclusive access to vc transaction
  * @xn: struct idpf_vc_xn* to access
  */
 #define idpf_vc_xn_lock(xn)			\
-	raw_spin_lock(&(xn)->completed.wait.lock)
+	spin_lock(&(xn)->lock)
 
 /**
  * idpf_vc_xn_unlock - Release exclusive access to vc transaction
  * @xn: struct idpf_vc_xn* to access
  */
 #define idpf_vc_xn_unlock(xn)		\
-	raw_spin_unlock(&(xn)->completed.wait.lock)
+	spin_unlock(&(xn)->lock)
 
 /**
  * idpf_vc_xn_release_bufs - Release reference to reply buffer(s) and

@@ -281,6 +276,7 @@ static void idpf_vc_xn_init(struct idpf_vc_xn_manager *vcxn_mngr)
 		xn->state = IDPF_VC_XN_IDLE;
 		xn->idx = i;
 		idpf_vc_xn_release_bufs(xn);
+		spin_lock_init(&xn->lock);
 		init_completion(&xn->completed);
 	}
 

index 77578206badab..a8e5f72e90f43 100644
@@ -41,8 +41,8 @@ typedef int (*async_vc_cb) (struct idpf_adapter *, struct idpf_vc_xn *,
  * struct idpf_vc_xn - Data structure representing virtchnl transactions
  * @completed: virtchnl event loop uses that to signal when a reply is
  *	       available, uses kernel completion API
- * @state: virtchnl event loop stores the data below, protected by the
- *	   completion's lock.
+ * @lock: protects the transaction state fields below
+ * @state: virtchnl event loop stores the data below, protected by @lock
  * @reply_sz: Original size of reply, may be > reply_buf.iov_len; it will be
  *	      truncated on its way to the receiver thread according to
  *	      reply_buf.iov_len.

@@ -57,6 +57,7 @@ typedef int (*async_vc_cb) (struct idpf_adapter *, struct idpf_vc_xn *,
  */
 struct idpf_vc_xn {
 	struct completion completed;
+	spinlock_t lock;
 	enum idpf_vc_xn_state state;
 	size_t reply_sz;
 	struct kvec reply;