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/* 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 */
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