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Drivers: hv: vmbus: Introduce {lock,unlock}_requestor()

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To abtract the lock and unlock operations on the requestor spin lock.
The helpers will come in handy in hv_pci.

No functional change.

Suggested-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Andrea Parri (Microsoft) <parri.andrea@gmail.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/20220419122325.10078-6-parri.andrea@gmail.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
This commit is contained in:
Andrea Parri (Microsoft) 2022-04-19 14:23:24 +02:00 committed by Wei Liu
parent 0aadb6a7bb
commit b91eaf7267
2 changed files with 20 additions and 6 deletions
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11
drivers/hv/channel.c
View File

@ -1252,12 +1252,12 @@ u64 vmbus_next_request_id(struct vmbus_channel *channel, u64 rqst_addr)
if (!channel->rqstor_size)
return VMBUS_NO_RQSTOR;
spin_lock_irqsave(&rqstor->req_lock, flags);
lock_requestor(channel, flags);
current_id = rqstor->next_request_id;
/* Requestor array is full */
if (current_id >= rqstor->size) {
spin_unlock_irqrestore(&rqstor->req_lock, flags);
unlock_requestor(channel, flags);
return VMBUS_RQST_ERROR;
}
@ -1267,7 +1267,7 @@ u64 vmbus_next_request_id(struct vmbus_channel *channel, u64 rqst_addr)
/* The already held spin lock provides atomicity */
bitmap_set(rqstor->req_bitmap, current_id, 1);
spin_unlock_irqrestore(&rqstor->req_lock, flags);
unlock_requestor(channel, flags);
/*
* Cannot return an ID of 0, which is reserved for an unsolicited
@ -1327,13 +1327,12 @@ EXPORT_SYMBOL_GPL(__vmbus_request_addr_match);
u64 vmbus_request_addr_match(struct vmbus_channel *channel, u64 trans_id,
u64 rqst_addr)
{
struct vmbus_requestor *rqstor = &channel->requestor;
unsigned long flags;
u64 req_addr;
spin_lock_irqsave(&rqstor->req_lock, flags);
lock_requestor(channel, flags);
req_addr = __vmbus_request_addr_match(channel, trans_id, rqst_addr);
spin_unlock_irqrestore(&rqstor->req_lock, flags);
unlock_requestor(channel, flags);
return req_addr;
}

15
include/linux/hyperv.h
View File

@ -1042,6 +1042,21 @@ struct vmbus_channel {
u32 max_pkt_size;
};
#define lock_requestor(channel, flags) \
do { \
struct vmbus_requestor *rqstor = &(channel)->requestor; \
\
spin_lock_irqsave(&rqstor->req_lock, flags); \
} while (0)
static __always_inline void unlock_requestor(struct vmbus_channel *channel,
unsigned long flags)
{
struct vmbus_requestor *rqstor = &channel->requestor;
spin_unlock_irqrestore(&rqstor->req_lock, flags);
}
u64 vmbus_next_request_id(struct vmbus_channel *channel, u64 rqst_addr);
u64 __vmbus_request_addr_match(struct vmbus_channel *channel, u64 trans_id,
u64 rqst_addr);