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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2022-2023, Advanced Micro Devices, Inc.
*/
#include <linux/vfio.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/eventfd.h>
#include <linux/msi.h>
#include <linux/interrupt.h>
#include "linux/cdx/cdx_bus.h"
#include "private.h"
static irqreturn_t vfio_cdx_msihandler(int irq_no, void *arg)
{
struct eventfd_ctx *trigger = arg;
eventfd_signal(trigger);
return IRQ_HANDLED;
}
static int vfio_cdx_msi_enable(struct vfio_cdx_device *vdev, int nvec)
{
struct cdx_device *cdx_dev = to_cdx_device(vdev->vdev.dev);
struct device *dev = vdev->vdev.dev;
int msi_idx, ret;
vdev->cdx_irqs = kcalloc(nvec, sizeof(struct vfio_cdx_irq), GFP_KERNEL);
if (!vdev->cdx_irqs)
return -ENOMEM;
ret = cdx_enable_msi(cdx_dev);
if (ret) {
kfree(vdev->cdx_irqs);
return ret;
}
/* Allocate cdx MSIs */
ret = msi_domain_alloc_irqs(dev, MSI_DEFAULT_DOMAIN, nvec);
if (ret) {
cdx_disable_msi(cdx_dev);
kfree(vdev->cdx_irqs);
return ret;
}
for (msi_idx = 0; msi_idx < nvec; msi_idx++)
vdev->cdx_irqs[msi_idx].irq_no = msi_get_virq(dev, msi_idx);
vdev->msi_count = nvec;
vdev->config_msi = 1;
return 0;
}
static int vfio_cdx_msi_set_vector_signal(struct vfio_cdx_device *vdev,
int vector, int fd)
{
struct eventfd_ctx *trigger;
int irq_no, ret;
if (vector < 0 || vector >= vdev->msi_count)
return -EINVAL;
irq_no = vdev->cdx_irqs[vector].irq_no;
if (vdev->cdx_irqs[vector].trigger) {
free_irq(irq_no, vdev->cdx_irqs[vector].trigger);
kfree(vdev->cdx_irqs[vector].name);
eventfd_ctx_put(vdev->cdx_irqs[vector].trigger);
vdev->cdx_irqs[vector].trigger = NULL;
}
if (fd < 0)
return 0;
vdev->cdx_irqs[vector].name = kasprintf(GFP_KERNEL, "vfio-msi[%d](%s)",
vector, dev_name(vdev->vdev.dev));
if (!vdev->cdx_irqs[vector].name)
return -ENOMEM;
trigger = eventfd_ctx_fdget(fd);
if (IS_ERR(trigger)) {
kfree(vdev->cdx_irqs[vector].name);
return PTR_ERR(trigger);
}
ret = request_irq(irq_no, vfio_cdx_msihandler, 0,
vdev->cdx_irqs[vector].name, trigger);
if (ret) {
kfree(vdev->cdx_irqs[vector].name);
eventfd_ctx_put(trigger);
return ret;
}
vdev->cdx_irqs[vector].trigger = trigger;
return 0;
}
static int vfio_cdx_msi_set_block(struct vfio_cdx_device *vdev,
unsigned int start, unsigned int count,
int32_t *fds)
{
int i, j, ret = 0;
if (start >= vdev->msi_count || start + count > vdev->msi_count)
return -EINVAL;
for (i = 0, j = start; i < count && !ret; i++, j++) {
int fd = fds ? fds[i] : -1;
ret = vfio_cdx_msi_set_vector_signal(vdev, j, fd);
}
if (ret) {
for (--j; j >= (int)start; j--)
vfio_cdx_msi_set_vector_signal(vdev, j, -1);
}
return ret;
}
static void vfio_cdx_msi_disable(struct vfio_cdx_device *vdev)
{
struct cdx_device *cdx_dev = to_cdx_device(vdev->vdev.dev);
struct device *dev = vdev->vdev.dev;
vfio_cdx_msi_set_block(vdev, 0, vdev->msi_count, NULL);
if (!vdev->config_msi)
return;
msi_domain_free_irqs_all(dev, MSI_DEFAULT_DOMAIN);
cdx_disable_msi(cdx_dev);
kfree(vdev->cdx_irqs);
vdev->cdx_irqs = NULL;
vdev->msi_count = 0;
vdev->config_msi = 0;
}
static int vfio_cdx_set_msi_trigger(struct vfio_cdx_device *vdev,
unsigned int index, unsigned int start,
unsigned int count, u32 flags,
void *data)
{
struct cdx_device *cdx_dev = to_cdx_device(vdev->vdev.dev);
int i;
if (start + count > cdx_dev->num_msi)
return -EINVAL;
if (!count && (flags & VFIO_IRQ_SET_DATA_NONE)) {
vfio_cdx_msi_disable(vdev);
return 0;
}
if (flags & VFIO_IRQ_SET_DATA_EVENTFD) {
s32 *fds = data;
int ret;
if (vdev->config_msi)
return vfio_cdx_msi_set_block(vdev, start, count,
fds);
ret = vfio_cdx_msi_enable(vdev, cdx_dev->num_msi);
if (ret)
return ret;
ret = vfio_cdx_msi_set_block(vdev, start, count, fds);
if (ret)
vfio_cdx_msi_disable(vdev);
return ret;
}
for (i = start; i < start + count; i++) {
if (!vdev->cdx_irqs[i].trigger)
continue;
if (flags & VFIO_IRQ_SET_DATA_NONE) {
eventfd_signal(vdev->cdx_irqs[i].trigger);
} else if (flags & VFIO_IRQ_SET_DATA_BOOL) {
u8 *bools = data;
if (bools[i - start])
eventfd_signal(vdev->cdx_irqs[i].trigger);
}
}
return 0;
}
int vfio_cdx_set_irqs_ioctl(struct vfio_cdx_device *vdev,
u32 flags, unsigned int index,
unsigned int start, unsigned int count,
void *data)
{
if (flags & VFIO_IRQ_SET_ACTION_TRIGGER)
return vfio_cdx_set_msi_trigger(vdev, index, start,
count, flags, data);
else
return -EINVAL;
}
/* Free All IRQs for the given device */
void vfio_cdx_irqs_cleanup(struct vfio_cdx_device *vdev)
{
/*
* Device does not support any interrupt or the interrupts
* were not configured
*/
if (!vdev->cdx_irqs)
return;
vfio_cdx_set_msi_trigger(vdev, 0, 0, 0, VFIO_IRQ_SET_DATA_NONE, NULL);
}
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