1 // SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
3 * Copyright 2013-2016 Freescale Semiconductor Inc.
7 #include <linux/vfio.h>
8 #include <linux/slab.h>
9 #include <linux/types.h>
10 #include <linux/eventfd.h>
11 #include <linux/msi.h>
13 #include "linux/fsl/mc.h"
14 #include "vfio_fsl_mc_private.h"
16 static int vfio_fsl_mc_irqs_allocate(struct vfio_fsl_mc_device *vdev)
18 struct fsl_mc_device *mc_dev = vdev->mc_dev;
19 struct vfio_fsl_mc_irq *mc_irq;
23 /* Device does not support any interrupt */
24 if (mc_dev->obj_desc.irq_count == 0)
27 /* interrupts were already allocated for this device */
31 irq_count = mc_dev->obj_desc.irq_count;
33 mc_irq = kcalloc(irq_count, sizeof(*mc_irq), GFP_KERNEL);
38 ret = fsl_mc_allocate_irqs(mc_dev);
44 for (i = 0; i < irq_count; i++) {
46 mc_irq[i].flags = VFIO_IRQ_INFO_EVENTFD;
49 vdev->mc_irqs = mc_irq;
54 static irqreturn_t vfio_fsl_mc_irq_handler(int irq_num, void *arg)
56 struct vfio_fsl_mc_irq *mc_irq = (struct vfio_fsl_mc_irq *)arg;
58 eventfd_signal(mc_irq->trigger, 1);
62 static int vfio_set_trigger(struct vfio_fsl_mc_device *vdev,
65 struct vfio_fsl_mc_irq *irq = &vdev->mc_irqs[index];
66 struct eventfd_ctx *trigger;
70 hwirq = vdev->mc_dev->irqs[index]->msi_desc->irq;
74 eventfd_ctx_put(irq->trigger);
78 if (fd < 0) /* Disable only */
81 irq->name = kasprintf(GFP_KERNEL, "vfio-irq[%d](%s)",
82 hwirq, dev_name(&vdev->mc_dev->dev));
86 trigger = eventfd_ctx_fdget(fd);
87 if (IS_ERR(trigger)) {
89 return PTR_ERR(trigger);
92 irq->trigger = trigger;
94 ret = request_irq(hwirq, vfio_fsl_mc_irq_handler, 0,
98 eventfd_ctx_put(trigger);
106 static int vfio_fsl_mc_set_irq_trigger(struct vfio_fsl_mc_device *vdev,
107 unsigned int index, unsigned int start,
108 unsigned int count, u32 flags,
111 struct fsl_mc_device *mc_dev = vdev->mc_dev;
113 struct vfio_fsl_mc_irq *irq;
114 struct device *cont_dev = fsl_mc_cont_dev(&mc_dev->dev);
115 struct fsl_mc_device *mc_cont = to_fsl_mc_device(cont_dev);
117 if (!count && (flags & VFIO_IRQ_SET_DATA_NONE))
118 return vfio_set_trigger(vdev, index, -1);
120 if (start != 0 || count != 1)
123 mutex_lock(&vdev->reflck->lock);
124 ret = fsl_mc_populate_irq_pool(mc_cont,
125 FSL_MC_IRQ_POOL_MAX_TOTAL_IRQS);
129 ret = vfio_fsl_mc_irqs_allocate(vdev);
132 mutex_unlock(&vdev->reflck->lock);
134 if (flags & VFIO_IRQ_SET_DATA_EVENTFD) {
135 s32 fd = *(s32 *)data;
137 return vfio_set_trigger(vdev, index, fd);
140 hwirq = vdev->mc_dev->irqs[index]->msi_desc->irq;
142 irq = &vdev->mc_irqs[index];
144 if (flags & VFIO_IRQ_SET_DATA_NONE) {
145 vfio_fsl_mc_irq_handler(hwirq, irq);
147 } else if (flags & VFIO_IRQ_SET_DATA_BOOL) {
148 u8 trigger = *(u8 *)data;
151 vfio_fsl_mc_irq_handler(hwirq, irq);
157 mutex_unlock(&vdev->reflck->lock);
162 int vfio_fsl_mc_set_irqs_ioctl(struct vfio_fsl_mc_device *vdev,
163 u32 flags, unsigned int index,
164 unsigned int start, unsigned int count,
167 if (flags & VFIO_IRQ_SET_ACTION_TRIGGER)
168 return vfio_fsl_mc_set_irq_trigger(vdev, index, start,
174 /* Free All IRQs for the given MC object */
175 void vfio_fsl_mc_irqs_cleanup(struct vfio_fsl_mc_device *vdev)
177 struct fsl_mc_device *mc_dev = vdev->mc_dev;
178 int irq_count = mc_dev->obj_desc.irq_count;
182 * Device does not support any interrupt or the interrupts
183 * were not configured
188 for (i = 0; i < irq_count; i++)
189 vfio_set_trigger(vdev, i, -1);
191 fsl_mc_free_irqs(mc_dev);
192 kfree(vdev->mc_irqs);
193 vdev->mc_irqs = NULL;