[dpdk-dev] [PATCH v3 08/27] common/octeontx2: introduce irq handling functions

[<jerinj@marvell.com>]

From: Jerin Jacob <jerinj@marvell.com>

All PCIe drivers(ethdev, mempool, cryptodev and eventdev) in octeontx2,
needs to handle interrupt for mailbox and error handling.
Create a helper function over rte interrupt API to register,
unregister, disable interrupts.

Signed-off-by: Jerin Jacob <jerinj@marvell.com>
Signed-off-by: Vamsi Attunuru <vattunuru@marvell.com>
Signed-off-by: Krzysztof Kanas <kkanas@marvell.com>
---
 drivers/common/octeontx2/Makefile             |   1 +
 drivers/common/octeontx2/meson.build          |   1 +
 drivers/common/octeontx2/otx2_irq.c           | 254 ++++++++++++++++++
 drivers/common/octeontx2/otx2_irq.h           |   6 +
 .../rte_common_octeontx2_version.map          |   4 +
 5 files changed, 266 insertions(+)
 create mode 100644 drivers/common/octeontx2/otx2_irq.c

diff --git a/drivers/common/octeontx2/Makefile b/drivers/common/octeontx2/Makefile
index a6f94553d..78243e555 100644
--- a/drivers/common/octeontx2/Makefile
+++ b/drivers/common/octeontx2/Makefile
@@ -26,6 +26,7 @@ LIBABIVER := 1
 # all source are stored in SRCS-y
 #
 SRCS-y += otx2_dev.c
+SRCS-y += otx2_irq.c
 SRCS-y += otx2_mbox.c
 SRCS-y += otx2_common.c
 
diff --git a/drivers/common/octeontx2/meson.build b/drivers/common/octeontx2/meson.build
index feaf75d92..44ac90085 100644
--- a/drivers/common/octeontx2/meson.build
+++ b/drivers/common/octeontx2/meson.build
@@ -3,6 +3,7 @@
 #
 
 sources= files('otx2_dev.c',
+		'otx2_irq.c',
 		'otx2_mbox.c',
 		'otx2_common.c',
 	       )
diff --git a/drivers/common/octeontx2/otx2_irq.c b/drivers/common/octeontx2/otx2_irq.c
new file mode 100644
index 000000000..fa3206af5
--- /dev/null
+++ b/drivers/common/octeontx2/otx2_irq.c
@@ -0,0 +1,254 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(C) 2019 Marvell International Ltd.
+ */
+
+#include <rte_alarm.h>
+#include <rte_common.h>
+#include <rte_eal.h>
+#include <rte_interrupts.h>
+
+#include "otx2_common.h"
+#include "otx2_irq.h"
+
+#ifdef RTE_EAL_VFIO
+
+#include <inttypes.h>
+#include <linux/vfio.h>
+#include <sys/eventfd.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
+
+#define MAX_INTR_VEC_ID RTE_MAX_RXTX_INTR_VEC_ID
+#define MSIX_IRQ_SET_BUF_LEN (sizeof(struct vfio_irq_set) + \
+			      sizeof(int) * (MAX_INTR_VEC_ID))
+
+static int
+irq_get_info(struct rte_intr_handle *intr_handle)
+{
+	struct vfio_irq_info irq = { .argsz = sizeof(irq) };
+	int rc;
+
+	irq.index = VFIO_PCI_MSIX_IRQ_INDEX;
+
+	rc = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_GET_IRQ_INFO, &irq);
+	if (rc < 0) {
+		otx2_err("Failed to get IRQ info rc=%d errno=%d", rc, errno);
+		return rc;
+	}
+
+	otx2_base_dbg("Flags=0x%x index=0x%x count=0x%x max_intr_vec_id=0x%x",
+		      irq.flags, irq.index, irq.count, MAX_INTR_VEC_ID);
+
+	if (irq.count > MAX_INTR_VEC_ID) {
+		otx2_err("HW max=%d > MAX_INTR_VEC_ID: %d",
+			 intr_handle->max_intr, MAX_INTR_VEC_ID);
+		intr_handle->max_intr = MAX_INTR_VEC_ID;
+	} else {
+		intr_handle->max_intr = irq.count;
+	}
+
+	return 0;
+}
+
+static int
+irq_config(struct rte_intr_handle *intr_handle, unsigned int vec)
+{
+	char irq_set_buf[MSIX_IRQ_SET_BUF_LEN];
+	struct vfio_irq_set *irq_set;
+	int32_t *fd_ptr;
+	int len, rc;
+
+	if (vec > intr_handle->max_intr) {
+		otx2_err("vector=%d greater than max_intr=%d", vec,
+				intr_handle->max_intr);
+		return -EINVAL;
+	}
+
+	len = sizeof(struct vfio_irq_set) + sizeof(int32_t);
+
+	irq_set = (struct vfio_irq_set *)irq_set_buf;
+	irq_set->argsz = len;
+
+	irq_set->start = vec;
+	irq_set->count = 1;
+	irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD |
+			VFIO_IRQ_SET_ACTION_TRIGGER;
+	irq_set->index = VFIO_PCI_MSIX_IRQ_INDEX;
+
+	/* Use vec fd to set interrupt vectors */
+	fd_ptr = (int32_t *)&irq_set->data[0];
+	fd_ptr[0] = intr_handle->efds[vec];
+
+	rc = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
+	if (rc)
+		otx2_err("Failed to set_irqs vector=0x%x rc=%d", vec, rc);
+
+	return rc;
+}
+
+static int
+irq_init(struct rte_intr_handle *intr_handle)
+{
+	char irq_set_buf[MSIX_IRQ_SET_BUF_LEN];
+	struct vfio_irq_set *irq_set;
+	int32_t *fd_ptr;
+	int len, rc;
+	uint32_t i;
+
+	if (intr_handle->max_intr > MAX_INTR_VEC_ID) {
+		otx2_err("Max_intr=%d greater than MAX_INTR_VEC_ID=%d",
+				intr_handle->max_intr, MAX_INTR_VEC_ID);
+		return -ERANGE;
+	}
+
+	len = sizeof(struct vfio_irq_set) +
+		sizeof(int32_t) * intr_handle->max_intr;
+
+	irq_set = (struct vfio_irq_set *)irq_set_buf;
+	irq_set->argsz = len;
+	irq_set->start = 0;
+	irq_set->count = intr_handle->max_intr;
+	irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD |
+			VFIO_IRQ_SET_ACTION_TRIGGER;
+	irq_set->index = VFIO_PCI_MSIX_IRQ_INDEX;
+
+	fd_ptr = (int32_t *)&irq_set->data[0];
+	for (i = 0; i < irq_set->count; i++)
+		fd_ptr[i] = -1;
+
+	rc = ioctl(intr_handle->vfio_dev_fd, VFIO_DEVICE_SET_IRQS, irq_set);
+	if (rc)
+		otx2_err("Failed to set irqs vector rc=%d", rc);
+
+	return rc;
+}
+
+/**
+ * @internal
+ * Disable IRQ
+ */
+int
+otx2_disable_irqs(struct rte_intr_handle *intr_handle)
+{
+	/* Clear max_intr to indicate re-init next time */
+	intr_handle->max_intr = 0;
+	return rte_intr_disable(intr_handle);
+}
+
+/**
+ * @internal
+ * Register IRQ
+ */
+int
+otx2_register_irq(struct rte_intr_handle *intr_handle,
+		  rte_intr_callback_fn cb, void *data, unsigned int vec)
+{
+	struct rte_intr_handle tmp_handle;
+	int rc;
+
+	/* If no max_intr read from VFIO */
+	if (intr_handle->max_intr == 0) {
+		irq_get_info(intr_handle);
+		irq_init(intr_handle);
+	}
+
+	if (vec > intr_handle->max_intr) {
+		otx2_err("Vector=%d greater than max_intr=%d", vec,
+				 intr_handle->max_intr);
+		return -EINVAL;
+	}
+
+	tmp_handle = *intr_handle;
+	/* Create new eventfd for interrupt vector */
+	tmp_handle.fd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
+	if (tmp_handle.fd == -1)
+		return -ENODEV;
+
+	/* Register vector interrupt callback */
+	rc = rte_intr_callback_register(&tmp_handle, cb, data);
+	if (rc) {
+		otx2_err("Failed to register vector:0x%x irq callback.", vec);
+		return rc;
+	}
+
+	intr_handle->efds[vec] = tmp_handle.fd;
+	intr_handle->nb_efd = (vec > intr_handle->nb_efd) ?
+			vec : intr_handle->nb_efd;
+	if ((intr_handle->nb_efd + 1) > intr_handle->max_intr)
+		intr_handle->max_intr = intr_handle->nb_efd + 1;
+
+	otx2_base_dbg("Enable vector:0x%x for vfio (efds: %d, max:%d)",
+		vec, intr_handle->nb_efd, intr_handle->max_intr);
+
+	/* Enable MSIX vectors to VFIO */
+	return irq_config(intr_handle, vec);
+}
+
+/**
+ * @internal
+ * Unregister IRQ
+ */
+void
+otx2_unregister_irq(struct rte_intr_handle *intr_handle,
+		    rte_intr_callback_fn cb, void *data, unsigned int vec)
+{
+	struct rte_intr_handle tmp_handle;
+
+	if (vec > intr_handle->max_intr) {
+		otx2_err("Error unregistering MSI-X interrupts vec:%d > %d",
+			vec, intr_handle->max_intr);
+		return;
+	}
+
+	tmp_handle = *intr_handle;
+	tmp_handle.fd = intr_handle->efds[vec];
+	if (tmp_handle.fd == -1)
+		return;
+
+	/* Un-register callback func from eal lib */
+	rte_intr_callback_unregister(&tmp_handle, cb, data);
+
+	otx2_base_dbg("Disable vector:0x%x for vfio (efds: %d, max:%d)",
+			vec, intr_handle->nb_efd, intr_handle->max_intr);
+
+	if (intr_handle->efds[vec] != -1)
+		close(intr_handle->efds[vec]);
+	/* Disable MSIX vectors from VFIO */
+	intr_handle->efds[vec] = -1;
+	irq_config(intr_handle, vec);
+}
+
+#else
+
+/**
+ * @internal
+ * Register IRQ
+ */
+int otx2_register_irq(__rte_unused struct rte_intr_handle *intr_handle,
+		      __rte_unused rte_intr_callback_fn cb,
+		      __rte_unused void *data, __rte_unused unsigned int vec)
+{
+	return -ENOTSUP;
+}
+
+
+/**
+ * @internal
+ * Unregister IRQ
+ */
+void otx2_unregister_irq(__rte_unused struct rte_intr_handle *intr_handle,
+			 __rte_unused rte_intr_callback_fn cb,
+			 __rte_unused void *data, __rte_unused unsigned int vec)
+{
+}
+
+/**
+ * @internal
+ * Disable IRQ
+ */
+int otx2_disable_irqs(__rte_unused struct rte_intr_handle *intr_handle)
+{
+	return -ENOTSUP;
+}
+
+#endif /* RTE_EAL_VFIO */
diff --git a/drivers/common/octeontx2/otx2_irq.h b/drivers/common/octeontx2/otx2_irq.h
index df44ddfba..9d326276e 100644
--- a/drivers/common/octeontx2/otx2_irq.h
+++ b/drivers/common/octeontx2/otx2_irq.h
@@ -16,4 +16,10 @@ typedef struct {
 	uint64_t bits[MAX_VFPF_DWORD_BITS];
 } otx2_intr_t;
 
+int otx2_register_irq(struct rte_intr_handle *intr_handle,
+		      rte_intr_callback_fn cb, void *data, unsigned int vec);
+void otx2_unregister_irq(struct rte_intr_handle *intr_handle,
+			 rte_intr_callback_fn cb, void *data, unsigned int vec);
+int otx2_disable_irqs(struct rte_intr_handle *intr_handle);
+
 #endif /* _OTX2_IRQ_H_ */
diff --git a/drivers/common/octeontx2/rte_common_octeontx2_version.map b/drivers/common/octeontx2/rte_common_octeontx2_version.map
index 4d9879899..007649a48 100644
--- a/drivers/common/octeontx2/rte_common_octeontx2_version.map
+++ b/drivers/common/octeontx2/rte_common_octeontx2_version.map
@@ -21,5 +21,9 @@ DPDK_19.08 {
 	otx2_mbox_msg_send;
 	otx2_mbox_wait_for_rsp;
 
+	otx2_disable_irqs;
+	otx2_unregister_irq;
+	otx2_register_irq;
+
 	local: *;
 };
-- 
2.21.0