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thunderbolt: Export ring handling functions to modules

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These are used by Thunderbolt services to send and receive frames over
the high-speed DMA rings.

We also put the functions to tb_ namespace to make sure we do not
collide with others and add missing kernel-doc comments for the exported
functions.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Michael Jamet <michael.jamet@intel.com>
Reviewed-by: Yehezkel Bernat <yehezkel.bernat@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Mika Westerberg
2017-10-02 13:38:37 +03:00
committed by David S. Miller
parent 9fb1e654dc
commit 3b3d9f4da9
4 changed files with 215 additions and 180 deletions
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70
drivers/thunderbolt/nhi.c
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@@ -253,7 +253,7 @@ invoke_callback:
}
}
int __ring_enqueue(struct tb_ring *ring, struct ring_frame *frame)
int __tb_ring_enqueue(struct tb_ring *ring, struct ring_frame *frame)
{
int ret = 0;
mutex_lock(&ring->lock);
@@ -266,6 +266,7 @@ int __ring_enqueue(struct tb_ring *ring, struct ring_frame *frame)
mutex_unlock(&ring->lock);
return ret;
}
EXPORT_SYMBOL_GPL(__tb_ring_enqueue);
static irqreturn_t ring_msix(int irq, void *data)
{
@@ -309,9 +310,9 @@ static void ring_release_msix(struct tb_ring *ring)
ring->irq = 0;
}
static struct tb_ring *ring_alloc(struct tb_nhi *nhi, u32 hop, int size,
bool transmit, unsigned int flags,
u16 sof_mask, u16 eof_mask)
static struct tb_ring *tb_ring_alloc(struct tb_nhi *nhi, u32 hop, int size,
bool transmit, unsigned int flags,
u16 sof_mask, u16 eof_mask)
{
struct tb_ring *ring = NULL;
dev_info(&nhi->pdev->dev, "allocating %s ring %d of size %d\n",
@@ -377,24 +378,42 @@ err:
return NULL;
}
struct tb_ring *ring_alloc_tx(struct tb_nhi *nhi, int hop, int size,
unsigned int flags)
/**
* tb_ring_alloc_tx() - Allocate DMA ring for transmit
* @nhi: Pointer to the NHI the ring is to be allocated
* @hop: HopID (ring) to allocate
* @size: Number of entries in the ring
* @flags: Flags for the ring
*/
struct tb_ring *tb_ring_alloc_tx(struct tb_nhi *nhi, int hop, int size,
unsigned int flags)
{
return ring_alloc(nhi, hop, size, true, flags, 0, 0);
}
struct tb_ring *ring_alloc_rx(struct tb_nhi *nhi, int hop, int size,
unsigned int flags, u16 sof_mask, u16 eof_mask)
{
return ring_alloc(nhi, hop, size, false, flags, sof_mask, eof_mask);
return tb_ring_alloc(nhi, hop, size, true, flags, 0, 0);
}
EXPORT_SYMBOL_GPL(tb_ring_alloc_tx);
/**
* ring_start() - enable a ring
*
* Must not be invoked in parallel with ring_stop().
* tb_ring_alloc_rx() - Allocate DMA ring for receive
* @nhi: Pointer to the NHI the ring is to be allocated
* @hop: HopID (ring) to allocate
* @size: Number of entries in the ring
* @flags: Flags for the ring
* @sof_mask: Mask of PDF values that start a frame
* @eof_mask: Mask of PDF values that end a frame
*/
void ring_start(struct tb_ring *ring)
struct tb_ring *tb_ring_alloc_rx(struct tb_nhi *nhi, int hop, int size,
unsigned int flags, u16 sof_mask, u16 eof_mask)
{
return tb_ring_alloc(nhi, hop, size, false, flags, sof_mask, eof_mask);
}
EXPORT_SYMBOL_GPL(tb_ring_alloc_rx);
/**
* tb_ring_start() - enable a ring
*
* Must not be invoked in parallel with tb_ring_stop().
*/
void tb_ring_start(struct tb_ring *ring)
{
u16 frame_size;
u32 flags;
@@ -450,21 +469,22 @@ err:
mutex_unlock(&ring->lock);
mutex_unlock(&ring->nhi->lock);
}
EXPORT_SYMBOL_GPL(tb_ring_start);
/**
* ring_stop() - shutdown a ring
* tb_ring_stop() - shutdown a ring
*
* Must not be invoked from a callback.
*
* This method will disable the ring. Further calls to ring_tx/ring_rx will
* return -ESHUTDOWN until ring_stop has been called.
* This method will disable the ring. Further calls to
* tb_ring_tx/tb_ring_rx will return -ESHUTDOWN until ring_stop has been
* called.
*
* All enqueued frames will be canceled and their callbacks will be executed
* with frame->canceled set to true (on the callback thread). This method
* returns only after all callback invocations have finished.
*/
void ring_stop(struct tb_ring *ring)
void tb_ring_stop(struct tb_ring *ring)
{
mutex_lock(&ring->nhi->lock);
mutex_lock(&ring->lock);
@@ -497,9 +517,10 @@ err:
schedule_work(&ring->work);
flush_work(&ring->work);
}
EXPORT_SYMBOL_GPL(tb_ring_stop);
/*
* ring_free() - free ring
* tb_ring_free() - free ring
*
* When this method returns all invocations of ring->callback will have
* finished.
@@ -508,7 +529,7 @@ err:
*
* Must NOT be called from ring_frame->callback!
*/
void ring_free(struct tb_ring *ring)
void tb_ring_free(struct tb_ring *ring)
{
mutex_lock(&ring->nhi->lock);
/*
@@ -550,6 +571,7 @@ void ring_free(struct tb_ring *ring)
mutex_destroy(&ring->lock);
kfree(ring);
}
EXPORT_SYMBOL_GPL(tb_ring_free);
/**
* nhi_mailbox_cmd() - Send a command through NHI mailbox