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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: 4e5a4eb203 ("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>
This commit is contained in:
Dave Jiang 2022-04-26 15:32:06 -07:00 committed by Vinod Koul
parent d84c3ad998
commit 2112b8f4fb
1 changed files with 22 additions and 0 deletions
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22
drivers/dma/idxd/dma.c
View File

@ -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;