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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 | // SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause) /* * Copyright 2013-2016 Freescale Semiconductor Inc. * Copyright 2019 NXP */ #include <linux/vfio.h> #include <linux/slab.h> #include <linux/types.h> #include <linux/eventfd.h> #include <linux/msi.h> #include "linux/fsl/mc.h" #include "vfio_fsl_mc_private.h" static int vfio_fsl_mc_irqs_allocate(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; /* interrupts were already allocated for this device */ if (vdev->mc_irqs) return 0; irq_count = mc_dev->obj_desc.irq_count; mc_irq = kcalloc(irq_count, sizeof(*mc_irq), GFP_KERNEL); if (!mc_irq) 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; } 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_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]->virq; 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; } static int vfio_fsl_mc_set_irq_trigger(struct vfio_fsl_mc_device *vdev, unsigned int index, unsigned int start, unsigned int count, u32 flags, void *data) { struct fsl_mc_device *mc_dev = vdev->mc_dev; int ret, hwirq; struct vfio_fsl_mc_irq *irq; struct device *cont_dev = fsl_mc_cont_dev(&mc_dev->dev); struct fsl_mc_device *mc_cont = to_fsl_mc_device(cont_dev); if (!count && (flags & VFIO_IRQ_SET_DATA_NONE)) return vfio_set_trigger(vdev, index, -1); if (start != 0 || count != 1) return -EINVAL; mutex_lock(&vdev->vdev.dev_set->lock); ret = fsl_mc_populate_irq_pool(mc_cont, FSL_MC_IRQ_POOL_MAX_TOTAL_IRQS); if (ret) goto unlock; ret = vfio_fsl_mc_irqs_allocate(vdev); if (ret) goto unlock; mutex_unlock(&vdev->vdev.dev_set->lock); if (flags & VFIO_IRQ_SET_DATA_EVENTFD) { s32 fd = *(s32 *)data; return vfio_set_trigger(vdev, index, fd); } hwirq = vdev->mc_dev->irqs[index]->virq; irq = &vdev->mc_irqs[index]; if (flags & VFIO_IRQ_SET_DATA_NONE) { vfio_fsl_mc_irq_handler(hwirq, irq); } else if (flags & VFIO_IRQ_SET_DATA_BOOL) { u8 trigger = *(u8 *)data; if (trigger) vfio_fsl_mc_irq_handler(hwirq, irq); } return 0; unlock: mutex_unlock(&vdev->vdev.dev_set->lock); return ret; } int vfio_fsl_mc_set_irqs_ioctl(struct vfio_fsl_mc_device *vdev, u32 flags, unsigned int index, unsigned int start, unsigned int count, void *data) { if (flags & VFIO_IRQ_SET_ACTION_TRIGGER) return vfio_fsl_mc_set_irq_trigger(vdev, index, start, count, flags, data); else return -EINVAL; } /* 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 or the interrupts * were not configured */ if (!vdev->mc_irqs) return; for (i = 0; i < irq_count; i++) vfio_set_trigger(vdev, i, -1); fsl_mc_free_irqs(mc_dev); kfree(vdev->mc_irqs); vdev->mc_irqs = NULL; } |