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SubjectRe: linux-next: build failure after merge of the slave-dma tree
On Tue, Aug 22, 2017 at 03:36:54PM +1000, Stephen Rothwell wrote:
> Hi Vinod,
>
> After merging the slave-dma tree, today's linux-next build (x86_64
> allmodconfig) failed like this:
>
> In file included from drivers/dma/dmaengine.h:9:0,
> from drivers/dma/altera-msgdma.c:27:
> drivers/dma/altera-msgdma.c: In function 'msgdma_probe':
> drivers/dma/altera-msgdma.c:946:14: error: 'DMA_SG' undeclared (first use in this function)
> dma_cap_set(DMA_SG, dma_dev->cap_mask);
> ^
> include/linux/dmaengine.h:1197:46: note: in definition of macro 'dma_cap_set'
> #define dma_cap_set(tx, mask) __dma_cap_set((tx), &(mask))
> ^
> drivers/dma/altera-msgdma.c:946:14: note: each undeclared identifier is reported only once for each function it appears in
> dma_cap_set(DMA_SG, dma_dev->cap_mask);
> ^
> include/linux/dmaengine.h:1197:46: note: in definition of macro 'dma_cap_set'
> #define dma_cap_set(tx, mask) __dma_cap_set((tx), &(mask))
> ^
> drivers/dma/altera-msgdma.c:965:9: error: 'struct dma_device' has no member named 'device_prep_dma_sg'
> dma_dev->device_prep_dma_sg = msgdma_prep_sg;
> ^
>
> Caused by commit
>
> a85c6f1b2921 ("dmaengine: Add driver for Altera / Intel mSGDMA IP core")
>
> interacting with commit
>
> c678fa66341c ("dmaengine: remove DMA_SG as it is dead code in kernel")
>
> This should have been fixed up in the merge commit
>
> 0a0ab6497093 ("Merge branch 'topic/dmatest' into next")
>
> I have used the slave-dma tree from next-20170817 for today.

Thanks Stephen for reporting, I have fixed it up by removed DMA_SG from this
driver with belo patch

-- >8 --

From: Vinod Koul <vinod.koul@intel.com>
Date: Tue, 22 Aug 2017 22:03:43 +0530
Subject: [PATCH] dmaengine: altera: remove DMA_SG

Commit c678fa66341c: ("dmaengine: remove DMA_SG as it is dead code in
kernel") removes DMA_SG from dmaengine subsystem but missed the newly added
driver, so remove it from here as well

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
---
drivers/dma/altera-msgdma.c | 94 ---------------------------------------------
1 file changed, 94 deletions(-)

diff --git a/drivers/dma/altera-msgdma.c b/drivers/dma/altera-msgdma.c
index 33b87b413793..75208b43d137 100644
--- a/drivers/dma/altera-msgdma.c
+++ b/drivers/dma/altera-msgdma.c
@@ -386,98 +386,6 @@ msgdma_prep_memcpy(struct dma_chan *dchan, dma_addr_t dma_dst,
}

/**
- * msgdma_prep_sg - prepare descriptors for a memory sg transaction
- * @dchan: DMA channel
- * @dst_sg: Destination scatter list
- * @dst_sg_len: Number of entries in destination scatter list
- * @src_sg: Source scatter list
- * @src_sg_len: Number of entries in source scatter list
- * @flags: transfer ack flags
- *
- * Return: Async transaction descriptor on success and NULL on failure
- */
-static struct dma_async_tx_descriptor *
-msgdma_prep_sg(struct dma_chan *dchan, struct scatterlist *dst_sg,
- unsigned int dst_sg_len, struct scatterlist *src_sg,
- unsigned int src_sg_len, unsigned long flags)
-{
- struct msgdma_device *mdev = to_mdev(dchan);
- struct msgdma_sw_desc *new, *first = NULL;
- void *desc = NULL;
- size_t len, dst_avail, src_avail;
- dma_addr_t dma_dst, dma_src;
- u32 desc_cnt = 0, i;
- struct scatterlist *sg;
-
- for_each_sg(src_sg, sg, src_sg_len, i)
- desc_cnt += DIV_ROUND_UP(sg_dma_len(sg), MSGDMA_MAX_TRANS_LEN);
-
- spin_lock_bh(&mdev->lock);
- 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);
-
- dst_avail = sg_dma_len(dst_sg);
- src_avail = sg_dma_len(src_sg);
-
- /* Run until we are out of scatterlist entries */
- while (true) {
- /* Allocate and populate the descriptor */
- new = msgdma_get_descriptor(mdev);
-
- desc = &new->hw_desc;
- len = min_t(size_t, src_avail, dst_avail);
- len = min_t(size_t, len, MSGDMA_MAX_TRANS_LEN);
- if (len == 0)
- goto fetch;
- dma_dst = sg_dma_address(dst_sg) + sg_dma_len(dst_sg) -
- dst_avail;
- dma_src = sg_dma_address(src_sg) + sg_dma_len(src_sg) -
- src_avail;
-
- msgdma_desc_config(desc, dma_dst, dma_src, len,
- MSGDMA_DESC_STRIDE_RW);
- dst_avail -= len;
- src_avail -= len;
-
- if (!first)
- first = new;
- else
- list_add_tail(&new->node, &first->tx_list);
-fetch:
- /* Fetch the next dst scatterlist entry */
- if (dst_avail == 0) {
- if (dst_sg_len == 0)
- break;
- dst_sg = sg_next(dst_sg);
- if (dst_sg == NULL)
- break;
- dst_sg_len--;
- dst_avail = sg_dma_len(dst_sg);
- }
- /* Fetch the next src scatterlist entry */
- if (src_avail == 0) {
- if (src_sg_len == 0)
- break;
- src_sg = sg_next(src_sg);
- if (src_sg == NULL)
- break;
- src_sg_len--;
- src_avail = sg_dma_len(src_sg);
- }
- }
-
- msgdma_desc_config_eod(desc);
- first->async_tx.flags = flags;
-
- return &first->async_tx;
-}
-
-/**
* msgdma_prep_slave_sg - prepare descriptors for a slave sg transaction
*
* @dchan: DMA channel
@@ -943,7 +851,6 @@ static int msgdma_probe(struct platform_device *pdev)
/* Set DMA capabilities */
dma_cap_zero(dma_dev->cap_mask);
dma_cap_set(DMA_MEMCPY, dma_dev->cap_mask);
- dma_cap_set(DMA_SG, dma_dev->cap_mask);
dma_cap_set(DMA_SLAVE, dma_dev->cap_mask);

dma_dev->src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
@@ -962,7 +869,6 @@ static int msgdma_probe(struct platform_device *pdev)

dma_dev->copy_align = DMAENGINE_ALIGN_4_BYTES;
dma_dev->device_prep_dma_memcpy = msgdma_prep_memcpy;
- dma_dev->device_prep_dma_sg = msgdma_prep_sg;
dma_dev->device_prep_slave_sg = msgdma_prep_slave_sg;
dma_dev->device_config = msgdma_dma_config;

--
2.7.4
--
~Vinod

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