dmaengine: idxd: add missing callback function to support DMA_INTERRUPT

When setting DMA_INTERRUPT capability, a callback function
dma->device_prep_dma_interrupt() is needed to support this capability.
Without setting the callback, dma_async_device_register() will fail dma
capability check.

Fixes: 4e5a4eb20393 ("dmaengine: idxd: set DMA_INTERRUPT cap bit")
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/165101232637.3951447.15765792791591763119.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

diff --git a/drivers/dma/idxd/dma.c b/drivers/dma/idxd/dma.c
index d3476a5..e0874cb 100644 (file)
--- a/drivers/dma/idxd/dma.c
+++ b/drivers/dma/idxd/dma.c
@@ -87,6 +87,27 @@ static inline void idxd_prep_desc_common(struct idxd_wq *wq,
        hw->completion_addr = compl;
 }
 
+static struct dma_async_tx_descriptor *
+idxd_dma_prep_interrupt(struct dma_chan *c, unsigned long flags)
+{
+       struct idxd_wq *wq = to_idxd_wq(c);
+       u32 desc_flags;
+       struct idxd_desc *desc;
+
+       if (wq->state != IDXD_WQ_ENABLED)
+               return NULL;
+
+       op_flag_setup(flags, &desc_flags);
+       desc = idxd_alloc_desc(wq, IDXD_OP_BLOCK);
+       if (IS_ERR(desc))
+               return NULL;
+
+       idxd_prep_desc_common(wq, desc->hw, DSA_OPCODE_NOOP,
+                             0, 0, 0, desc->compl_dma, desc_flags);
+       desc->txd.flags = flags;
+       return &desc->txd;
+}
+
 static struct dma_async_tx_descriptor *
 idxd_dma_submit_memcpy(struct dma_chan *c, dma_addr_t dma_dest,
                       dma_addr_t dma_src, size_t len, unsigned long flags)
@@ -198,6 +219,7 @@ int idxd_register_dma_device(struct idxd_device *idxd)
        dma_cap_set(DMA_COMPLETION_NO_ORDER, dma->cap_mask);
        dma->device_release = idxd_dma_release;
 
+       dma->device_prep_dma_interrupt = idxd_dma_prep_interrupt;
        if (idxd->hw.opcap.bits[0] & IDXD_OPCAP_MEMMOVE) {
                dma_cap_set(DMA_MEMCPY, dma->cap_mask);
                dma->device_prep_dma_memcpy = idxd_dma_submit_memcpy;