[dpdk-dev] [PATCH v7 04/16] dma/idxd: create dmadev instances on bus probe

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

When a suitable device is found during the bus scan/probe, create a dmadev
instance for each HW queue. Internal structures required for device
creation are also added.

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
Signed-off-by: Kevin Laatz <kevin.laatz@intel.com>
Reviewed-by: Conor Walsh <conor.walsh@intel.com>
---
 drivers/dma/idxd/idxd_bus.c      | 19 +++++++++
 drivers/dma/idxd/idxd_common.c   | 72 ++++++++++++++++++++++++++++++++
 drivers/dma/idxd/idxd_internal.h | 40 ++++++++++++++++++
 drivers/dma/idxd/meson.build     |  1 +
 4 files changed, 132 insertions(+)
 create mode 100644 drivers/dma/idxd/idxd_common.c

diff --git a/drivers/dma/idxd/idxd_bus.c b/drivers/dma/idxd/idxd_bus.c
index ef589af30e..b48fa954ed 100644
--- a/drivers/dma/idxd/idxd_bus.c
+++ b/drivers/dma/idxd/idxd_bus.c
@@ -85,6 +85,18 @@ dsa_get_sysfs_path(void)
 	return path ? path : DSA_SYSFS_PATH;
 }
 
+static int
+idxd_dev_close(struct rte_dma_dev *dev)
+{
+	struct idxd_dmadev *idxd = dev->data->dev_private;
+	munmap(idxd->portal, 0x1000);
+	return 0;
+}
+
+static const struct rte_dma_dev_ops idxd_bus_ops = {
+		.dev_close = idxd_dev_close,
+};
+
 static void *
 idxd_bus_mmap_wq(struct rte_dsa_device *dev)
 {
@@ -206,6 +218,7 @@ idxd_probe_dsa(struct rte_dsa_device *dev)
 		return -1;
 	idxd.max_batch_size = ret;
 	idxd.qid = dev->addr.wq_id;
+	idxd.u.bus.dsa_id = dev->addr.device_id;
 	idxd.sva_support = 1;
 
 	idxd.portal = idxd_bus_mmap_wq(dev);
@@ -214,6 +227,12 @@ idxd_probe_dsa(struct rte_dsa_device *dev)
 		return -ENOENT;
 	}
 
+	ret = idxd_dmadev_create(dev->wq_name, &dev->device, &idxd, &idxd_bus_ops);
+	if (ret) {
+		IDXD_PMD_ERR("Failed to create rawdev %s", dev->wq_name);
+		return ret;
+	}
+
 	return 0;
 }
 
diff --git a/drivers/dma/idxd/idxd_common.c b/drivers/dma/idxd/idxd_common.c
new file mode 100644
index 0000000000..be8f684bd5
--- /dev/null
+++ b/drivers/dma/idxd/idxd_common.c
@@ -0,0 +1,72 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright 2021 Intel Corporation
+ */
+
+#include <rte_dmadev_pmd.h>
+#include <rte_malloc.h>
+#include <rte_common.h>
+
+#include "idxd_internal.h"
+
+#define IDXD_PMD_NAME_STR "dmadev_idxd"
+
+int
+idxd_dmadev_create(const char *name, struct rte_device *dev,
+		   const struct idxd_dmadev *base_idxd,
+		   const struct rte_dma_dev_ops *ops)
+{
+	struct idxd_dmadev *idxd = NULL;
+	struct rte_dma_dev *dmadev = NULL;
+	int ret = 0;
+
+	if (!name) {
+		IDXD_PMD_ERR("Invalid name of the device!");
+		ret = -EINVAL;
+		goto cleanup;
+	}
+
+	/* Allocate device structure */
+	dmadev = rte_dma_pmd_allocate(name, dev->numa_node, sizeof(struct idxd_dmadev));
+	if (dmadev == NULL) {
+		IDXD_PMD_ERR("Unable to allocate raw device");
+		ret = -ENOMEM;
+		goto cleanup;
+	}
+	dmadev->dev_ops = ops;
+	dmadev->device = dev;
+
+	idxd = dmadev->data->dev_private;
+	*idxd = *base_idxd; /* copy over the main fields already passed in */
+	idxd->dmadev = dmadev;
+
+	/* allocate batch index ring and completion ring.
+	 * The +1 is because we can never fully use
+	 * the ring, otherwise read == write means both full and empty.
+	 */
+	idxd->batch_comp_ring = rte_zmalloc(NULL, (sizeof(idxd->batch_idx_ring[0]) +
+			sizeof(idxd->batch_comp_ring[0]))	* (idxd->max_batches + 1),
+			sizeof(idxd->batch_comp_ring[0]));
+	if (idxd->batch_comp_ring == NULL) {
+		IDXD_PMD_ERR("Unable to reserve memory for batch data\n");
+		ret = -ENOMEM;
+		goto cleanup;
+	}
+	idxd->batch_idx_ring = (void *)&idxd->batch_comp_ring[idxd->max_batches+1];
+	idxd->batch_iova = rte_mem_virt2iova(idxd->batch_comp_ring);
+
+	dmadev->fp_obj->dev_private = idxd;
+
+	idxd->dmadev->state = RTE_DMA_DEV_READY;
+
+	return 0;
+
+cleanup:
+	if (dmadev)
+		rte_dma_pmd_release(name);
+
+	return ret;
+}
+
+int idxd_pmd_logtype;
+
+RTE_LOG_REGISTER_DEFAULT(idxd_pmd_logtype, WARNING);
diff --git a/drivers/dma/idxd/idxd_internal.h b/drivers/dma/idxd/idxd_internal.h
index c6a7dcd72f..fa6f053f72 100644
--- a/drivers/dma/idxd/idxd_internal.h
+++ b/drivers/dma/idxd/idxd_internal.h
@@ -24,4 +24,44 @@ extern int idxd_pmd_logtype;
 #define IDXD_PMD_ERR(fmt, args...)    IDXD_PMD_LOG(ERR, fmt, ## args)
 #define IDXD_PMD_WARN(fmt, args...)   IDXD_PMD_LOG(WARNING, fmt, ## args)
 
+struct idxd_dmadev {
+	/* counters to track the batches */
+	unsigned short max_batches;
+	unsigned short batch_idx_read;
+	unsigned short batch_idx_write;
+
+	/* track descriptors and handles */
+	unsigned short desc_ring_mask;
+	unsigned short ids_avail; /* handles for ops completed */
+	unsigned short ids_returned; /* the read pointer for hdls/desc rings */
+	unsigned short batch_start; /* start+size == write pointer for hdls/desc */
+	unsigned short batch_size;
+
+	void *portal; /* address to write the batch descriptor */
+
+	struct idxd_completion *batch_comp_ring;
+	unsigned short *batch_idx_ring; /* store where each batch ends */
+
+	struct rte_dma_stats stats;
+
+	rte_iova_t batch_iova; /* base address of the batch comp ring */
+	rte_iova_t desc_iova; /* base address of desc ring, needed for completions */
+
+	unsigned short max_batch_size;
+
+	struct rte_dma_dev *dmadev;
+	struct rte_dma_vchan_conf qcfg;
+	uint8_t sva_support;
+	uint8_t qid;
+
+	union {
+		struct {
+			unsigned int dsa_id;
+		} bus;
+	} u;
+};
+
+int idxd_dmadev_create(const char *name, struct rte_device *dev,
+		const struct idxd_dmadev *base_idxd, const struct rte_dma_dev_ops *ops);
+
 #endif /* _IDXD_INTERNAL_H_ */
diff --git a/drivers/dma/idxd/meson.build b/drivers/dma/idxd/meson.build
index 45418077f4..da5dc2b019 100644
--- a/drivers/dma/idxd/meson.build
+++ b/drivers/dma/idxd/meson.build
@@ -8,5 +8,6 @@ endif
 deps += ['bus_pci']
 sources = files(
         'idxd_bus.c',
+        'idxd_common.c',
         'idxd_pci.c'
 )
-- 
2.30.2