fsldma: improve link descriptor debugging

This adds better tracking to link descriptor allocations, callbacks, and
frees. This makes it much easier to track errors with link descriptors.

Signed-off-by: Ira W. Snyder <iws@ovro.caltech.edu>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

diff --git a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c
index e535cd1..82b8e9f 100644 (file)
--- a/drivers/dma/fsldma.c
+++ b/drivers/dma/fsldma.c
@@ -420,6 +420,10 @@ static struct fsl_desc_sw *fsl_dma_alloc_descriptor(
        desc->async_tx.tx_submit = fsl_dma_tx_submit;
        desc->async_tx.phys = pdesc;
 
+#ifdef FSL_DMA_LD_DEBUG
+       chan_dbg(chan, "LD %p allocated\n", desc);
+#endif
+
        return desc;
 }
 
@@ -470,6 +474,9 @@ static void fsldma_free_desc_list(struct fsldma_chan *chan,
 
        list_for_each_entry_safe(desc, _desc, list, node) {
                list_del(&desc->node);
+#ifdef FSL_DMA_LD_DEBUG
+               chan_dbg(chan, "LD %p free\n", desc);
+#endif
                dma_pool_free(chan->desc_pool, desc, desc->async_tx.phys);
        }
 }
@@ -481,6 +488,9 @@ static void fsldma_free_desc_list_reverse(struct fsldma_chan *chan,
 
        list_for_each_entry_safe_reverse(desc, _desc, list, node) {
                list_del(&desc->node);
+#ifdef FSL_DMA_LD_DEBUG
+               chan_dbg(chan, "LD %p free\n", desc);
+#endif
                dma_pool_free(chan->desc_pool, desc, desc->async_tx.phys);
        }
 }
@@ -557,9 +567,6 @@ static struct dma_async_tx_descriptor *fsl_dma_prep_memcpy(
                        chan_err(chan, "%s\n", msg_ld_oom);
                        goto fail;
                }
-#ifdef FSL_DMA_LD_DEBUG
-               chan_dbg(chan, "new link desc alloc %p\n", new);
-#endif
 
                copy = min(len, (size_t)FSL_DMA_BCR_MAX_CNT);
 
@@ -645,9 +652,6 @@ static struct dma_async_tx_descriptor *fsl_dma_prep_sg(struct dma_chan *dchan,
                        chan_err(chan, "%s\n", msg_ld_oom);
                        goto fail;
                }
-#ifdef FSL_DMA_LD_DEBUG
-               chan_dbg(chan, "new link desc alloc %p\n", new);
-#endif
 
                set_desc_cnt(chan, &new->hw, len);
                set_desc_src(chan, &new->hw, src);
@@ -882,13 +886,18 @@ static void fsl_chan_ld_cleanup(struct fsldma_chan *chan)
                callback_param = desc->async_tx.callback_param;
                if (callback) {
                        spin_unlock_irqrestore(&chan->desc_lock, flags);
+#ifdef FSL_DMA_LD_DEBUG
                        chan_dbg(chan, "LD %p callback\n", desc);
+#endif
                        callback(callback_param);
                        spin_lock_irqsave(&chan->desc_lock, flags);
                }
 
                /* Run any dependencies, then free the descriptor */
                dma_run_dependencies(&desc->async_tx);
+#ifdef FSL_DMA_LD_DEBUG
+               chan_dbg(chan, "LD %p free\n", desc);
+#endif
                dma_pool_free(chan->desc_pool, desc, desc->async_tx.phys);
        }