Commit 7a23c5ab authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'dmaengine-fix-4.14-rc5' of git://git.infradead.org/users/vkoul/slave-dma 

Pull dmaengine fixes from Vinod Koul:
 "Here are fixes for this round

   - fix spinlock usage amd fifo response for altera driver

   - fix ti crossbar race condition

   - fix edma memcpy align"

* tag 'dmaengine-fix-4.14-rc5' of git://git.infradead.org/users/vkoul/slave-dma:
  dmaengine: altera: fix spinlock usage
  dmaengine: altera: fix response FIFO emptying
  dmaengine: ti-dma-crossbar: Fix possible race condition with dma_inuse
  dmaengine: edma: Align the memcpy acnt array size with the transfer
parents e7a36a6e edf10919

drivers/dma/altera-msgdma.c

+22 −15
Original line number Diff line number Diff line
@@ -212,11 +212,12 @@ struct msgdma_device { 
static struct msgdma_sw_desc *msgdma_get_descriptor(struct msgdma_device *mdev)

{

	struct msgdma_sw_desc *desc;

	unsigned long flags;



	spin_lock_bh(&mdev->lock);

	spin_lock_irqsave(&mdev->lock, flags);

	desc = list_first_entry(&mdev->free_list, struct msgdma_sw_desc, node);

	list_del(&desc->node);

	spin_unlock_bh(&mdev->lock);

	spin_unlock_irqrestore(&mdev->lock, flags);



	INIT_LIST_HEAD(&desc->tx_list);
@@ -306,13 +307,14 @@ static dma_cookie_t msgdma_tx_submit(struct dma_async_tx_descriptor *tx) 
	struct msgdma_device *mdev = to_mdev(tx->chan);

	struct msgdma_sw_desc *new;

	dma_cookie_t cookie;

	unsigned long flags;



	new = tx_to_desc(tx);

	spin_lock_bh(&mdev->lock);

	spin_lock_irqsave(&mdev->lock, flags);

	cookie = dma_cookie_assign(tx);



	list_add_tail(&new->node, &mdev->pending_list);

	spin_unlock_bh(&mdev->lock);

	spin_unlock_irqrestore(&mdev->lock, flags);



	return cookie;

}
@@ -336,17 +338,18 @@ msgdma_prep_memcpy(struct dma_chan *dchan, dma_addr_t dma_dst, 
	struct msgdma_extended_desc *desc;

	size_t copy;

	u32 desc_cnt;

	unsigned long irqflags;



	desc_cnt = DIV_ROUND_UP(len, MSGDMA_MAX_TRANS_LEN);



	spin_lock_bh(&mdev->lock);

	spin_lock_irqsave(&mdev->lock, irqflags);

	if (desc_cnt > mdev->desc_free_cnt) {

		spin_unlock_bh(&mdev->lock);

		dev_dbg(mdev->dev, "mdev %p descs are not available\n", mdev);

		return NULL;

	}

	mdev->desc_free_cnt -= desc_cnt;

	spin_unlock_bh(&mdev->lock);

	spin_unlock_irqrestore(&mdev->lock, irqflags);



	do {

		/* Allocate and populate the descriptor */
@@ -397,18 +400,19 @@ msgdma_prep_slave_sg(struct dma_chan *dchan, struct scatterlist *sgl, 
	u32 desc_cnt = 0, i;

	struct scatterlist *sg;

	u32 stride;

	unsigned long irqflags;



	for_each_sg(sgl, sg, sg_len, i)

		desc_cnt += DIV_ROUND_UP(sg_dma_len(sg), MSGDMA_MAX_TRANS_LEN);



	spin_lock_bh(&mdev->lock);

	spin_lock_irqsave(&mdev->lock, irqflags);

	if (desc_cnt > mdev->desc_free_cnt) {

		spin_unlock_bh(&mdev->lock);

		dev_dbg(mdev->dev, "mdev %p descs are not available\n", mdev);

		return NULL;

	}

	mdev->desc_free_cnt -= desc_cnt;

	spin_unlock_bh(&mdev->lock);

	spin_unlock_irqrestore(&mdev->lock, irqflags);



	avail = sg_dma_len(sgl);
@@ -566,10 +570,11 @@ static void msgdma_start_transfer(struct msgdma_device *mdev) 
static void msgdma_issue_pending(struct dma_chan *chan)

{

	struct msgdma_device *mdev = to_mdev(chan);

	unsigned long flags;



	spin_lock_bh(&mdev->lock);

	spin_lock_irqsave(&mdev->lock, flags);

	msgdma_start_transfer(mdev);

	spin_unlock_bh(&mdev->lock);

	spin_unlock_irqrestore(&mdev->lock, flags);

}



/**
@@ -634,10 +639,11 @@ static void msgdma_free_descriptors(struct msgdma_device *mdev) 
static void msgdma_free_chan_resources(struct dma_chan *dchan)

{

	struct msgdma_device *mdev = to_mdev(dchan);

	unsigned long flags;



	spin_lock_bh(&mdev->lock);

	spin_lock_irqsave(&mdev->lock, flags);

	msgdma_free_descriptors(mdev);

	spin_unlock_bh(&mdev->lock);

	spin_unlock_irqrestore(&mdev->lock, flags);

	kfree(mdev->sw_desq);

}
@@ -682,8 +688,9 @@ static void msgdma_tasklet(unsigned long data) 
	u32 count;

	u32 __maybe_unused size;

	u32 __maybe_unused status;

	unsigned long flags;



	spin_lock(&mdev->lock);

	spin_lock_irqsave(&mdev->lock, flags);



	/* Read number of responses that are available */

	count = ioread32(mdev->csr + MSGDMA_CSR_RESP_FILL_LEVEL);
@@ -698,13 +705,13 @@ static void msgdma_tasklet(unsigned long data) 
		 * bits. So we need to just drop these values.

		 */

		size = ioread32(mdev->resp + MSGDMA_RESP_BYTES_TRANSFERRED);

		status = ioread32(mdev->resp - MSGDMA_RESP_STATUS);

		status = ioread32(mdev->resp + MSGDMA_RESP_STATUS);



		msgdma_complete_descriptor(mdev);

		msgdma_chan_desc_cleanup(mdev);

	}



	spin_unlock(&mdev->lock);

	spin_unlock_irqrestore(&mdev->lock, flags);

}



/**

drivers/dma/edma.c

+16 −3
Original line number Diff line number Diff line
@@ -1143,11 +1143,24 @@ static struct dma_async_tx_descriptor *edma_prep_dma_memcpy( 
	struct edma_desc *edesc;

	struct device *dev = chan->device->dev;

	struct edma_chan *echan = to_edma_chan(chan);

	unsigned int width, pset_len;

	unsigned int width, pset_len, array_size;



	if (unlikely(!echan || !len))

		return NULL;



	/* Align the array size (acnt block) with the transfer properties */

	switch (__ffs((src | dest | len))) {

	case 0:

		array_size = SZ_32K - 1;

		break;

	case 1:

		array_size = SZ_32K - 2;

		break;

	default:

		array_size = SZ_32K - 4;

		break;

	}



	if (len < SZ_64K) {

		/*

		 * Transfer size less than 64K can be handled with one paRAM
@@ -1169,7 +1182,7 @@ static struct dma_async_tx_descriptor *edma_prep_dma_memcpy( 
		 * When the full_length is multibple of 32767 one slot can be

		 * used to complete the transfer.

		 */

		width = SZ_32K - 1;

		width = array_size;

		pset_len = rounddown(len, width);

		/* One slot is enough for lengths multiple of (SZ_32K -1) */

		if (unlikely(pset_len == len))
@@ -1217,7 +1230,7 @@ static struct dma_async_tx_descriptor *edma_prep_dma_memcpy( 
		}

		dest += pset_len;

		src += pset_len;

		pset_len = width = len % (SZ_32K - 1);

		pset_len = width = len % array_size;



		ret = edma_config_pset(chan, &edesc->pset[1], src, dest, 1,

				       width, pset_len, DMA_MEM_TO_MEM);

drivers/dma/ti-dma-crossbar.c

+2 −1
Original line number Diff line number Diff line
@@ -262,13 +262,14 @@ static void *ti_dra7_xbar_route_allocate(struct of_phandle_args *dma_spec, 
	mutex_lock(&xbar->mutex);

	map->xbar_out = find_first_zero_bit(xbar->dma_inuse,

					    xbar->dma_requests);

	mutex_unlock(&xbar->mutex);

	if (map->xbar_out == xbar->dma_requests) {

		mutex_unlock(&xbar->mutex);

		dev_err(&pdev->dev, "Run out of free DMA requests\n");

		kfree(map);

		return ERR_PTR(-ENOMEM);

	}

	set_bit(map->xbar_out, xbar->dma_inuse);

	mutex_unlock(&xbar->mutex);



	map->xbar_in = (u16)dma_spec->args[0];

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