diff options
Diffstat (limited to 'drivers/vfio/fsl-mc/vfio_fsl_mc_intr.c')
| -rw-r--r-- | drivers/vfio/fsl-mc/vfio_fsl_mc_intr.c | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/drivers/vfio/fsl-mc/vfio_fsl_mc_intr.c b/drivers/vfio/fsl-mc/vfio_fsl_mc_intr.c new file mode 100644 index 0000000..eb244bb --- /dev/null +++ b/drivers/vfio/fsl-mc/vfio_fsl_mc_intr.c @@ -0,0 +1,199 @@ +/* + * Freescale Management Complex (MC) device passthrough using VFIO + * + * Copyright (C) 2013-2016 Freescale Semiconductor, Inc. + * Author: Bharat Bhushan <bharat.bhushan@nxp.com> + * + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + */ + +#include <linux/vfio.h> +#include <linux/slab.h> +#include <linux/types.h> +#include <linux/eventfd.h> +#include <linux/msi.h> + +#include "../../staging/fsl-mc/include/mc.h" +#include "vfio_fsl_mc_private.h" + +static irqreturn_t vfio_fsl_mc_irq_handler(int irq_num, void *arg) +{ + struct vfio_fsl_mc_irq *mc_irq = (struct vfio_fsl_mc_irq *)arg; + + eventfd_signal(mc_irq->trigger, 1); + return IRQ_HANDLED; +} + +static int vfio_fsl_mc_irq_mask(struct vfio_fsl_mc_device *vdev, + unsigned int index, unsigned int start, + unsigned int count, uint32_t flags, + void *data) +{ + return -EINVAL; +} + +static int vfio_fsl_mc_irq_unmask(struct vfio_fsl_mc_device *vdev, + unsigned int index, unsigned int start, + unsigned int count, uint32_t flags, + void *data) +{ + return -EINVAL; +} + +static int vfio_set_trigger(struct vfio_fsl_mc_device *vdev, + int index, int fd) +{ + struct vfio_fsl_mc_irq *irq = &vdev->mc_irqs[index]; + struct eventfd_ctx *trigger; + int hwirq; + int ret; + + hwirq = vdev->mc_dev->irqs[index]->msi_desc->irq; + if (irq->trigger) { + free_irq(hwirq, irq); + kfree(irq->name); + eventfd_ctx_put(irq->trigger); + irq->trigger = NULL; + } + + if (fd < 0) /* Disable only */ + return 0; + + irq->name = kasprintf(GFP_KERNEL, "vfio-irq[%d](%s)", + hwirq, dev_name(&vdev->mc_dev->dev)); + if (!irq->name) + return -ENOMEM; + + trigger = eventfd_ctx_fdget(fd); + if (IS_ERR(trigger)) { + kfree(irq->name); + return PTR_ERR(trigger); + } + + irq->trigger = trigger; + + ret = request_irq(hwirq, vfio_fsl_mc_irq_handler, 0, + irq->name, irq); + if (ret) { + kfree(irq->name); + eventfd_ctx_put(trigger); + irq->trigger = NULL; + return ret; + } + + return 0; +} + +int vfio_fsl_mc_irqs_init(struct vfio_fsl_mc_device *vdev) +{ + struct fsl_mc_device *mc_dev = vdev->mc_dev; + struct vfio_fsl_mc_irq *mc_irq; + int irq_count; + int ret, i; + + /* Device does not support any interrupt */ + if (mc_dev->obj_desc.irq_count == 0) + return 0; + + irq_count = mc_dev->obj_desc.irq_count; + + mc_irq = kcalloc(irq_count, sizeof(*mc_irq), GFP_KERNEL); + if (mc_irq == NULL) + return -ENOMEM; + + /* Allocate IRQs */ + ret = fsl_mc_allocate_irqs(mc_dev); + if (ret) { + kfree(mc_irq); + return ret; + } + + for (i = 0; i < irq_count; i++) { + mc_irq[i].count = 1; + mc_irq[i].flags = VFIO_IRQ_INFO_EVENTFD; + } + + vdev->mc_irqs = mc_irq; + + return 0; +} + +/* Free All IRQs for the given MC object */ +void vfio_fsl_mc_irqs_cleanup(struct vfio_fsl_mc_device *vdev) +{ + struct fsl_mc_device *mc_dev = vdev->mc_dev; + int irq_count = mc_dev->obj_desc.irq_count; + int i; + + /* Device does not support any interrupt */ + if (mc_dev->obj_desc.irq_count == 0) + return; + + for (i = 0; i < irq_count; i++) + vfio_set_trigger(vdev, i, -1); + + fsl_mc_free_irqs(mc_dev); + kfree(vdev->mc_irqs); +} + +static int vfio_fsl_mc_set_irq_trigger(struct vfio_fsl_mc_device *vdev, + unsigned int index, unsigned int start, + unsigned int count, uint32_t flags, + void *data) +{ + struct vfio_fsl_mc_irq *irq = &vdev->mc_irqs[index]; + int hwirq; + + if (!count && (flags & VFIO_IRQ_SET_DATA_NONE)) + return vfio_set_trigger(vdev, index, -1); + + if (start != 0 || count != 1) + return -EINVAL; + + if (flags & VFIO_IRQ_SET_DATA_EVENTFD) { + int32_t fd = *(int32_t *)data; + + return vfio_set_trigger(vdev, index, fd); + } + + hwirq = vdev->mc_dev->irqs[index]->msi_desc->irq; + + if (flags & VFIO_IRQ_SET_DATA_NONE) { + vfio_fsl_mc_irq_handler(hwirq, irq); + + } else if (flags & VFIO_IRQ_SET_DATA_BOOL) { + uint8_t trigger = *(uint8_t *)data; + + if (trigger) + vfio_fsl_mc_irq_handler(hwirq, irq); + } + + return 0; +} + +int vfio_fsl_mc_set_irqs_ioctl(struct vfio_fsl_mc_device *vdev, + uint32_t flags, unsigned int index, + unsigned int start, unsigned int count, + void *data) +{ + int ret = -ENOTTY; + + switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) { + case VFIO_IRQ_SET_ACTION_MASK: + ret = vfio_fsl_mc_irq_mask(vdev, index, start, count, + flags, data); + break; + case VFIO_IRQ_SET_ACTION_UNMASK: + ret = vfio_fsl_mc_irq_unmask(vdev, index, start, count, + flags, data); + break; + case VFIO_IRQ_SET_ACTION_TRIGGER: + ret = vfio_fsl_mc_set_irq_trigger(vdev, index, start, + count, flags, data); + break; + } + + return ret; +} |