[dpdk-dev] [PATCH v6 12/16] dma/idxd: add vchan status function

[Kevin Laatz <kevin.laatz@intel.com>]

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.laatz@intel.com>
Reviewed-by: Conor Walsh <conor.walsh@intel.com>

---
v3: update API name to vchan_status
---
 drivers/dma/idxd/idxd_bus.c      |  1 +
 drivers/dma/idxd/idxd_common.c   | 17 +++++++++++++++++
 drivers/dma/idxd/idxd_internal.h |  2 ++
 drivers/dma/idxd/idxd_pci.c      |  1 +
 4 files changed, 21 insertions(+)

diff --git a/drivers/dma/idxd/idxd_bus.c b/drivers/dma/idxd/idxd_bus.c
index b52ea02854..e6caa048a9 100644
--- a/drivers/dma/idxd/idxd_bus.c
+++ b/drivers/dma/idxd/idxd_bus.c
@@ -101,6 +101,7 @@ static const struct rte_dma_dev_ops idxd_bus_ops = {
 		.dev_info_get = idxd_info_get,
 		.stats_get = idxd_stats_get,
 		.stats_reset = idxd_stats_reset,
+		.vchan_status = idxd_vchan_status,
 };
 
 static void *
diff --git a/drivers/dma/idxd/idxd_common.c b/drivers/dma/idxd/idxd_common.c
index 7a3eb0a4c1..12c113a93b 100644
--- a/drivers/dma/idxd/idxd_common.c
+++ b/drivers/dma/idxd/idxd_common.c
@@ -162,6 +162,23 @@ get_comp_status(struct idxd_completion *c)
 	}
 }
 
+int
+idxd_vchan_status(const struct rte_dma_dev *dev, uint16_t vchan __rte_unused,
+		enum rte_dma_vchan_status *status)
+{
+	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;
+	uint8_t bstatus = (idxd->batch_comp_ring[last_batch_write].status != 0);
+
+	/* An IDXD device will always be either active or idle.
+	 * RTE_DMA_VCHAN_HALTED_ERROR is therefore not supported by IDXD.
+	 */
+	*status = bstatus ? RTE_DMA_VCHAN_IDLE : RTE_DMA_VCHAN_ACTIVE;
+
+	return 0;
+}
+
 static __rte_always_inline int
 batch_ok(struct idxd_dmadev *idxd, uint16_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 e2a1119ef7..a291ad26d9 100644
--- a/drivers/dma/idxd/idxd_internal.h
+++ b/drivers/dma/idxd/idxd_internal.h
@@ -101,5 +101,7 @@ uint16_t idxd_completed_status(struct rte_dma_dev *dev, uint16_t qid __rte_unuse
 int idxd_stats_get(const struct rte_dma_dev *dev, uint16_t vchan,
 		struct rte_dma_stats *stats, uint32_t stats_sz);
 int idxd_stats_reset(struct rte_dma_dev *dev, uint16_t vchan);
+int idxd_vchan_status(const struct rte_dma_dev *dev, uint16_t vchan,
+		enum rte_dma_vchan_status *status);
 
 #endif /* _IDXD_INTERNAL_H_ */
diff --git a/drivers/dma/idxd/idxd_pci.c b/drivers/dma/idxd/idxd_pci.c
index cf91eb9c5e..3152ec1289 100644
--- a/drivers/dma/idxd/idxd_pci.c
+++ b/drivers/dma/idxd/idxd_pci.c
@@ -140,6 +140,7 @@ static const struct rte_dma_dev_ops idxd_pci_ops = {
 	.stats_reset = idxd_stats_reset,
 	.dev_start = idxd_pci_dev_start,
 	.dev_stop = idxd_pci_dev_stop,
+	.vchan_status = idxd_vchan_status,
 };
 
 /* each portal uses 4 x 4k pages */
-- 
2.30.2