On Tue, Mar 17, 2015 at 01:28:38PM +0800, Yuan Yao wrote:
> +static int fsl_qdma_alloc_chan_resources(struct dma_chan *chan)
> +{
> + /*
> + * In QDMA mode, We don't need to do anything.
> + */
> + return 0;
> +}
Pls remove this
> +static struct fsl_qdma_comp *fsl_qdma_request_enqueue_desc(
> + struct fsl_qdma_chan *fsl_chan)
> +{
> + struct fsl_qdma_comp *comp_temp;
> + struct fsl_qdma_queue *queue = fsl_chan->queue;
> + unsigned long flags;
> +
> + spin_lock_irqsave(&queue->queue_lock, flags);
> + if (list_empty(&queue->comp_free)) {
> + spin_unlock_irqrestore(&queue->queue_lock, flags);
> + comp_temp = kzalloc(sizeof(*comp_temp), GFP_KERNEL);
this is called by prep_ APIs so should be atomic so GFP_KERNEL is wrong, you
should use GFP_NOWAIT like you did for below..
> +static int fsl_qdma_halt(struct fsl_qdma_engine *fsl_qdma)
> +{
> + void __iomem *addr = fsl_qdma->membase;
> + int i, count = 5;
> + u32 reg;
> +
> + /* Disable the command queue and wait for idle state. */
no locks held while you do this ?
> +static struct dma_async_tx_descriptor *fsl_qdma_prep_dma_sg(
> + struct dma_chan *chan,
> + struct scatterlist *dst_sg, unsigned int dst_nents,
> + struct scatterlist *src_sg, unsigned int src_nents,
> + unsigned long flags)
> +{
> + return NULL;
> +}
why is this empty?
> + dma_cap_set(DMA_PRIVATE, fsl_qdma->dma_dev.cap_mask);
> + dma_cap_set(DMA_SLAVE, fsl_qdma->dma_dev.cap_mask);
> + dma_cap_set(DMA_MEMCPY, fsl_qdma->dma_dev.cap_mask);
> +
> + fsl_qdma->dma_dev.dev = &pdev->dev;
> + fsl_qdma->dma_dev.device_alloc_chan_resources
> + = fsl_qdma_alloc_chan_resources;
> + fsl_qdma->dma_dev.device_free_chan_resources
> + = fsl_qdma_free_chan_resources;
> + fsl_qdma->dma_dev.device_tx_status = fsl_qdma_tx_status;
> + fsl_qdma->dma_dev.device_prep_dma_memcpy = fsl_qdma_prep_memcpy;
> + fsl_qdma->dma_dev.device_prep_dma_sg = fsl_qdma_prep_dma_sg;
> + fsl_qdma->dma_dev.device_issue_pending = fsl_qdma_issue_pending;
pls set direction etc fields as well
> +
> + /* Free descriptor areas */
> + for (i = 0; i < fsl_qdma->n_queues; i++) {
> + queue_temp = fsl_qdma->queue + i;
> + list_for_each_entry_safe(comp_temp, _comp_temp,
> + &queue_temp->comp_used, list) {
> + dma_pool_free(queue_temp->comp_pool,
> + comp_temp->virt_addr,
> + comp_temp->bus_addr);
> + list_del(&comp_temp->list);
> + kfree(comp_temp);
> + }
> + list_for_each_entry_safe(comp_temp, _comp_temp,
> + &queue_temp->comp_free, list) {
> + dma_pool_free(queue_temp->comp_pool,
> + comp_temp->virt_addr,
> + comp_temp->bus_addr);
> + list_del(&comp_temp->list);
> + kfree(comp_temp);
> + }
> + dma_free_coherent(&pdev->dev, sizeof(struct fsl_qdma_ccdf) *
> + queue_temp->n_cq, queue_temp->cq,
> + queue_temp->bus_addr);
> + dma_pool_destroy(queue_temp->comp_pool);
> + }
> +
> + dma_free_coherent(&pdev->dev, sizeof(struct fsl_qdma_ccdf) *
> + status->n_cq, status->cq, status->bus_addr);
and at this point you still have irq registered and enabled, so can be
invoked!
--
~Vinod
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