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rapidio/tsi721: fix locking in OB_MSG processing 

- Add spinlock protection into outbound message queuing routine.

- Change outbound message interrupt handler to avoid deadlock when
  calling registered callback routine.

- Allow infinite retries for outbound messages to avoid retry threshold
  error signaling in systems with nodes that have slow message receive
  queue processing.

Signed-off-by: Alexandre Bounine <alexandre.bounine@idt.com>
Cc: Matt Porter <mporter@kernel.crashing.org>
Cc: Aurelien Jacquiot <a-jacquiot@ti.com>
Cc: Andre van Herk <andre.van.herk@prodrive-technologies.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alexandre Bounine 2016-03-22 14:26:47 -07:00 committed by Linus Torvalds
parent 9a0b062742
commit 2ece1caf66
1 changed files with 30 additions and 12 deletions
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42
drivers/rapidio/devices/tsi721.c
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@ -1453,11 +1453,14 @@ tsi721_add_outb_message(struct rio_mport *mport, struct rio_dev *rdev, int mbox,
struct tsi721_device *priv = mport->priv;
struct tsi721_omsg_desc *desc;
u32 tx_slot;
unsigned long flags;
if (!priv->omsg_init[mbox] ||
len > TSI721_MSG_MAX_SIZE || len < 8)
return -EINVAL;
spin_lock_irqsave(&priv->omsg_ring[mbox].lock, flags);
tx_slot = priv->omsg_ring[mbox].tx_slot;
/* Copy copy message into transfer buffer */
@ -1469,9 +1472,11 @@ tsi721_add_outb_message(struct rio_mport *mport, struct rio_dev *rdev, int mbox,
/* Build descriptor associated with buffer */
desc = priv->omsg_ring[mbox].omd_base;
desc[tx_slot].type_id = cpu_to_le32((DTYPE4 << 29) | rdev->destid);
#ifdef TSI721_OMSG_DESC_INT
/* Request IOF_DONE interrupt generation for each N-th frame in queue */
if (tx_slot % 4 == 0)
desc[tx_slot].type_id |= cpu_to_le32(TSI721_OMD_IOF);
#endif
desc[tx_slot].msg_info =
cpu_to_le32((mport->sys_size << 26) | (mbox << 22) |
(0xe << 12) | (len & 0xff8));
@ -1497,6 +1502,8 @@ tsi721_add_outb_message(struct rio_mport *mport, struct rio_dev *rdev, int mbox,
priv->regs + TSI721_OBDMAC_DWRCNT(mbox));
ioread32(priv->regs + TSI721_OBDMAC_DWRCNT(mbox));
spin_unlock_irqrestore(&priv->omsg_ring[mbox].lock, flags);
return 0;
}
@ -1511,6 +1518,9 @@ static void tsi721_omsg_handler(struct tsi721_device *priv, int ch)
{
u32 omsg_int;
struct rio_mport *mport = &priv->mport;
void *dev_id = NULL;
u32 tx_slot = 0xffffffff;
int do_callback = 0;
spin_lock(&priv->omsg_ring[ch].lock);
@ -1524,7 +1534,6 @@ static void tsi721_omsg_handler(struct tsi721_device *priv, int ch)
u32 srd_ptr;
u64 *sts_ptr, last_ptr = 0, prev_ptr = 0;
int i, j;
u32 tx_slot;
/*
* Find last successfully processed descriptor
@ -1574,14 +1583,19 @@ static void tsi721_omsg_handler(struct tsi721_device *priv, int ch)
goto no_sts_update;
}
if (tx_slot >= priv->omsg_ring[ch].size)
dev_dbg(&priv->pdev->dev,
"OB_MSG tx_slot=%x > size=%x",
tx_slot, priv->omsg_ring[ch].size);
WARN_ON(tx_slot >= priv->omsg_ring[ch].size);
/* Move slot index to the next message to be sent */
++tx_slot;
if (tx_slot == priv->omsg_ring[ch].size)
tx_slot = 0;
BUG_ON(tx_slot >= priv->omsg_ring[ch].size);
mport->outb_msg[ch].mcback(mport,
priv->omsg_ring[ch].dev_id, ch,
tx_slot);
dev_id = priv->omsg_ring[ch].dev_id;
do_callback = 1;
}
no_sts_update:
@ -1597,15 +1611,15 @@ no_sts_update:
iowrite32(TSI721_OBDMAC_INT_ERROR,
priv->regs + TSI721_OBDMAC_INT(ch));
iowrite32(TSI721_OBDMAC_CTL_INIT,
iowrite32(TSI721_OBDMAC_CTL_RETRY_THR | TSI721_OBDMAC_CTL_INIT,
priv->regs + TSI721_OBDMAC_CTL(ch));
ioread32(priv->regs + TSI721_OBDMAC_CTL(ch));
/* Inform upper level to clear all pending tx slots */
if (mport->outb_msg[ch].mcback)
mport->outb_msg[ch].mcback(mport,
priv->omsg_ring[ch].dev_id, ch,
priv->omsg_ring[ch].tx_slot);
dev_id = priv->omsg_ring[ch].dev_id;
tx_slot = priv->omsg_ring[ch].tx_slot;
do_callback = 1;
/* Synch tx_slot tracking */
iowrite32(priv->omsg_ring[ch].tx_slot,
priv->regs + TSI721_OBDMAC_DRDCNT(ch));
@ -1627,6 +1641,9 @@ no_sts_update:
}
spin_unlock(&priv->omsg_ring[ch].lock);
if (mport->outb_msg[ch].mcback && do_callback)
mport->outb_msg[ch].mcback(mport, dev_id, ch, tx_slot);
}
/**
@ -1768,7 +1785,8 @@ static int tsi721_open_outb_mbox(struct rio_mport *mport, void *dev_id,
mb();
/* Initialize Outbound Message engine */
iowrite32(TSI721_OBDMAC_CTL_INIT, priv->regs + TSI721_OBDMAC_CTL(mbox));
iowrite32(TSI721_OBDMAC_CTL_RETRY_THR | TSI721_OBDMAC_CTL_INIT,
priv->regs + TSI721_OBDMAC_CTL(mbox));
ioread32(priv->regs + TSI721_OBDMAC_DWRCNT(mbox));
udelay(10);