[dpdk-dev] [PATCH v2 13/16] dma/idxd: add vchan idle function

[Kevin Laatz]

When testing dmadev drivers, it is useful to have the HW device in a known
state. This patch adds the implementation of the function which will wait
for the device to be idle (all jobs completed) before proceeding.

Signed-off-by: Kevin Laatz <kevin.la...@intel.com>
---
 drivers/dma/idxd/idxd_bus.c      |  1 +
 drivers/dma/idxd/idxd_common.c   | 10 ++++++++++
 drivers/dma/idxd/idxd_internal.h |  1 +
 drivers/dma/idxd/idxd_pci.c      |  1 +
 4 files changed, 13 insertions(+)

diff --git a/drivers/dma/idxd/idxd_bus.c b/drivers/dma/idxd/idxd_bus.c
index 9482dab9be..4788bbf6d7 100644
--- a/drivers/dma/idxd/idxd_bus.c
+++ b/drivers/dma/idxd/idxd_bus.c
@@ -100,6 +100,7 @@ static const struct rte_dmadev_ops idxd_vdev_ops = {
                .dev_info_get = idxd_info_get,
                .stats_get = idxd_stats_get,
                .stats_reset = idxd_stats_reset,
+               .vchan_idle = idxd_vchan_idle,
 };
 
 static void *
diff --git a/drivers/dma/idxd/idxd_common.c b/drivers/dma/idxd/idxd_common.c
index 7c72396dc8..ab43875409 100644
--- a/drivers/dma/idxd/idxd_common.c
+++ b/drivers/dma/idxd/idxd_common.c
@@ -165,6 +165,16 @@ get_comp_status(struct idxd_completion *c)
        }
 }
 
+int
+idxd_vchan_idle(const struct rte_dmadev *dev, uint16_t vchan __rte_unused)
+{
+       struct idxd_dmadev *idxd = dev->dev_private;
+       uint16_t last_batch_write = idxd->batch_idx_write == 0 ? 
idxd->max_batches :
+                       idxd->batch_idx_write - 1;
+
+       return (idxd->batch_comp_ring[last_batch_write].status != 0);
+}
+
 static __rte_always_inline int
 batch_ok(struct idxd_dmadev *idxd, uint8_t max_ops, enum rte_dma_status_code 
*status)
 {
diff --git a/drivers/dma/idxd/idxd_internal.h b/drivers/dma/idxd/idxd_internal.h
index 5079b4207d..a865ae1954 100644
--- a/drivers/dma/idxd/idxd_internal.h
+++ b/drivers/dma/idxd/idxd_internal.h
@@ -98,5 +98,6 @@ uint16_t idxd_completed_status(struct rte_dmadev *dev, 
uint16_t qid __rte_unused
 int idxd_stats_get(const struct rte_dmadev *dev, uint16_t vchan,
                struct rte_dmadev_stats *stats, uint32_t stats_sz);
 int idxd_stats_reset(struct rte_dmadev *dev, uint16_t vchan);
+int idxd_vchan_idle(const struct rte_dmadev *dev, uint16_t vchan);
 
 #endif /* _IDXD_INTERNAL_H_ */
diff --git a/drivers/dma/idxd/idxd_pci.c b/drivers/dma/idxd/idxd_pci.c
index a84232b6e9..b7a079ac52 100644
--- a/drivers/dma/idxd/idxd_pci.c
+++ b/drivers/dma/idxd/idxd_pci.c
@@ -118,6 +118,7 @@ static const struct rte_dmadev_ops idxd_pci_ops = {
        .stats_reset = idxd_stats_reset,
        .dev_start = idxd_pci_dev_start,
        .dev_stop = idxd_pci_dev_stop,
+       .vchan_idle = idxd_vchan_idle,
 };
 
 /* each portal uses 4 x 4k pages */
-- 
2.30.2