576 lines
13 KiB
C
576 lines
13 KiB
C
/*
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* Copyright (C) 2013 - Virtual Open Systems
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* Author: Antonios Motakis <a.motakis@virtualopensystems.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, version 2, as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/device.h>
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#include <linux/iommu.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/uaccess.h>
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#include <linux/vfio.h>
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#include "vfio_platform_private.h"
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static DEFINE_MUTEX(driver_lock);
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static const struct vfio_platform_reset_combo reset_lookup_table[] = {
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{
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.compat = "calxeda,hb-xgmac",
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.reset_function_name = "vfio_platform_calxedaxgmac_reset",
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.module_name = "vfio-platform-calxedaxgmac",
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},
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};
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static void vfio_platform_get_reset(struct vfio_platform_device *vdev,
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struct device *dev)
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{
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const char *compat;
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int (*reset)(struct vfio_platform_device *);
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int ret, i;
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ret = device_property_read_string(dev, "compatible", &compat);
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if (ret)
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return;
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for (i = 0 ; i < ARRAY_SIZE(reset_lookup_table); i++) {
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if (!strcmp(reset_lookup_table[i].compat, compat)) {
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request_module(reset_lookup_table[i].module_name);
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reset = __symbol_get(
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reset_lookup_table[i].reset_function_name);
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if (reset) {
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vdev->reset = reset;
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return;
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}
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}
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}
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}
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static void vfio_platform_put_reset(struct vfio_platform_device *vdev)
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{
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if (vdev->reset)
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symbol_put_addr(vdev->reset);
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}
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static int vfio_platform_regions_init(struct vfio_platform_device *vdev)
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{
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int cnt = 0, i;
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while (vdev->get_resource(vdev, cnt))
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cnt++;
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vdev->regions = kcalloc(cnt, sizeof(struct vfio_platform_region),
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GFP_KERNEL);
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if (!vdev->regions)
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return -ENOMEM;
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for (i = 0; i < cnt; i++) {
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struct resource *res =
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vdev->get_resource(vdev, i);
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if (!res)
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goto err;
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vdev->regions[i].addr = res->start;
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vdev->regions[i].size = resource_size(res);
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vdev->regions[i].flags = 0;
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switch (resource_type(res)) {
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case IORESOURCE_MEM:
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vdev->regions[i].type = VFIO_PLATFORM_REGION_TYPE_MMIO;
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vdev->regions[i].flags |= VFIO_REGION_INFO_FLAG_READ;
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if (!(res->flags & IORESOURCE_READONLY))
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vdev->regions[i].flags |=
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VFIO_REGION_INFO_FLAG_WRITE;
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/*
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* Only regions addressed with PAGE granularity may be
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* MMAPed securely.
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*/
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if (!(vdev->regions[i].addr & ~PAGE_MASK) &&
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!(vdev->regions[i].size & ~PAGE_MASK))
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vdev->regions[i].flags |=
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VFIO_REGION_INFO_FLAG_MMAP;
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break;
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case IORESOURCE_IO:
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vdev->regions[i].type = VFIO_PLATFORM_REGION_TYPE_PIO;
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break;
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default:
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goto err;
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}
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}
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vdev->num_regions = cnt;
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return 0;
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err:
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kfree(vdev->regions);
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return -EINVAL;
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}
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static void vfio_platform_regions_cleanup(struct vfio_platform_device *vdev)
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{
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int i;
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for (i = 0; i < vdev->num_regions; i++)
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iounmap(vdev->regions[i].ioaddr);
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vdev->num_regions = 0;
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kfree(vdev->regions);
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}
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static void vfio_platform_release(void *device_data)
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{
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struct vfio_platform_device *vdev = device_data;
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mutex_lock(&driver_lock);
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if (!(--vdev->refcnt)) {
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if (vdev->reset)
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vdev->reset(vdev);
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vfio_platform_regions_cleanup(vdev);
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vfio_platform_irq_cleanup(vdev);
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}
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mutex_unlock(&driver_lock);
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module_put(THIS_MODULE);
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}
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static int vfio_platform_open(void *device_data)
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{
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struct vfio_platform_device *vdev = device_data;
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int ret;
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if (!try_module_get(THIS_MODULE))
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return -ENODEV;
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mutex_lock(&driver_lock);
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if (!vdev->refcnt) {
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ret = vfio_platform_regions_init(vdev);
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if (ret)
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goto err_reg;
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ret = vfio_platform_irq_init(vdev);
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if (ret)
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goto err_irq;
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if (vdev->reset)
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vdev->reset(vdev);
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}
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vdev->refcnt++;
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mutex_unlock(&driver_lock);
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return 0;
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err_irq:
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vfio_platform_regions_cleanup(vdev);
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err_reg:
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mutex_unlock(&driver_lock);
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module_put(THIS_MODULE);
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return ret;
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}
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static long vfio_platform_ioctl(void *device_data,
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unsigned int cmd, unsigned long arg)
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{
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struct vfio_platform_device *vdev = device_data;
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unsigned long minsz;
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if (cmd == VFIO_DEVICE_GET_INFO) {
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struct vfio_device_info info;
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minsz = offsetofend(struct vfio_device_info, num_irqs);
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if (copy_from_user(&info, (void __user *)arg, minsz))
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return -EFAULT;
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if (info.argsz < minsz)
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return -EINVAL;
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if (vdev->reset)
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vdev->flags |= VFIO_DEVICE_FLAGS_RESET;
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info.flags = vdev->flags;
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info.num_regions = vdev->num_regions;
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info.num_irqs = vdev->num_irqs;
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return copy_to_user((void __user *)arg, &info, minsz);
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} else if (cmd == VFIO_DEVICE_GET_REGION_INFO) {
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struct vfio_region_info info;
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minsz = offsetofend(struct vfio_region_info, offset);
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if (copy_from_user(&info, (void __user *)arg, minsz))
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return -EFAULT;
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if (info.argsz < minsz)
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return -EINVAL;
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if (info.index >= vdev->num_regions)
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return -EINVAL;
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/* map offset to the physical address */
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info.offset = VFIO_PLATFORM_INDEX_TO_OFFSET(info.index);
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info.size = vdev->regions[info.index].size;
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info.flags = vdev->regions[info.index].flags;
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return copy_to_user((void __user *)arg, &info, minsz);
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} else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) {
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struct vfio_irq_info info;
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minsz = offsetofend(struct vfio_irq_info, count);
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if (copy_from_user(&info, (void __user *)arg, minsz))
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return -EFAULT;
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if (info.argsz < minsz)
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return -EINVAL;
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if (info.index >= vdev->num_irqs)
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return -EINVAL;
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info.flags = vdev->irqs[info.index].flags;
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info.count = vdev->irqs[info.index].count;
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return copy_to_user((void __user *)arg, &info, minsz);
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} else if (cmd == VFIO_DEVICE_SET_IRQS) {
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struct vfio_irq_set hdr;
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u8 *data = NULL;
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int ret = 0;
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minsz = offsetofend(struct vfio_irq_set, count);
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if (copy_from_user(&hdr, (void __user *)arg, minsz))
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return -EFAULT;
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if (hdr.argsz < minsz)
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return -EINVAL;
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if (hdr.index >= vdev->num_irqs)
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return -EINVAL;
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if (hdr.flags & ~(VFIO_IRQ_SET_DATA_TYPE_MASK |
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VFIO_IRQ_SET_ACTION_TYPE_MASK))
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return -EINVAL;
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if (!(hdr.flags & VFIO_IRQ_SET_DATA_NONE)) {
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size_t size;
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if (hdr.flags & VFIO_IRQ_SET_DATA_BOOL)
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size = sizeof(uint8_t);
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else if (hdr.flags & VFIO_IRQ_SET_DATA_EVENTFD)
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size = sizeof(int32_t);
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else
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return -EINVAL;
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if (hdr.argsz - minsz < size)
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return -EINVAL;
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data = memdup_user((void __user *)(arg + minsz), size);
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if (IS_ERR(data))
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return PTR_ERR(data);
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}
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mutex_lock(&vdev->igate);
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ret = vfio_platform_set_irqs_ioctl(vdev, hdr.flags, hdr.index,
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hdr.start, hdr.count, data);
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mutex_unlock(&vdev->igate);
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kfree(data);
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return ret;
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} else if (cmd == VFIO_DEVICE_RESET) {
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if (vdev->reset)
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return vdev->reset(vdev);
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else
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return -EINVAL;
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}
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return -ENOTTY;
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}
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static ssize_t vfio_platform_read_mmio(struct vfio_platform_region reg,
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char __user *buf, size_t count,
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loff_t off)
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{
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unsigned int done = 0;
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if (!reg.ioaddr) {
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reg.ioaddr =
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ioremap_nocache(reg.addr, reg.size);
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if (!reg.ioaddr)
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return -ENOMEM;
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}
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while (count) {
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size_t filled;
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if (count >= 4 && !(off % 4)) {
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u32 val;
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val = ioread32(reg.ioaddr + off);
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if (copy_to_user(buf, &val, 4))
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goto err;
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filled = 4;
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} else if (count >= 2 && !(off % 2)) {
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u16 val;
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val = ioread16(reg.ioaddr + off);
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if (copy_to_user(buf, &val, 2))
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goto err;
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filled = 2;
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} else {
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u8 val;
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val = ioread8(reg.ioaddr + off);
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if (copy_to_user(buf, &val, 1))
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goto err;
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filled = 1;
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}
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count -= filled;
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done += filled;
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off += filled;
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buf += filled;
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}
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return done;
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err:
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return -EFAULT;
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}
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static ssize_t vfio_platform_read(void *device_data, char __user *buf,
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size_t count, loff_t *ppos)
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{
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struct vfio_platform_device *vdev = device_data;
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unsigned int index = VFIO_PLATFORM_OFFSET_TO_INDEX(*ppos);
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loff_t off = *ppos & VFIO_PLATFORM_OFFSET_MASK;
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if (index >= vdev->num_regions)
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return -EINVAL;
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if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_READ))
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return -EINVAL;
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if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO)
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return vfio_platform_read_mmio(vdev->regions[index],
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buf, count, off);
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else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO)
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return -EINVAL; /* not implemented */
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return -EINVAL;
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}
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static ssize_t vfio_platform_write_mmio(struct vfio_platform_region reg,
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const char __user *buf, size_t count,
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loff_t off)
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{
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unsigned int done = 0;
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if (!reg.ioaddr) {
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reg.ioaddr =
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ioremap_nocache(reg.addr, reg.size);
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if (!reg.ioaddr)
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return -ENOMEM;
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}
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while (count) {
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size_t filled;
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if (count >= 4 && !(off % 4)) {
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u32 val;
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if (copy_from_user(&val, buf, 4))
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goto err;
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iowrite32(val, reg.ioaddr + off);
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filled = 4;
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} else if (count >= 2 && !(off % 2)) {
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u16 val;
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if (copy_from_user(&val, buf, 2))
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goto err;
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iowrite16(val, reg.ioaddr + off);
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filled = 2;
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} else {
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u8 val;
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if (copy_from_user(&val, buf, 1))
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goto err;
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iowrite8(val, reg.ioaddr + off);
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filled = 1;
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}
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count -= filled;
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done += filled;
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off += filled;
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buf += filled;
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}
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return done;
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err:
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return -EFAULT;
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}
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static ssize_t vfio_platform_write(void *device_data, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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struct vfio_platform_device *vdev = device_data;
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unsigned int index = VFIO_PLATFORM_OFFSET_TO_INDEX(*ppos);
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loff_t off = *ppos & VFIO_PLATFORM_OFFSET_MASK;
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if (index >= vdev->num_regions)
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return -EINVAL;
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if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_WRITE))
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return -EINVAL;
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if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO)
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return vfio_platform_write_mmio(vdev->regions[index],
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buf, count, off);
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else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO)
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return -EINVAL; /* not implemented */
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return -EINVAL;
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}
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static int vfio_platform_mmap_mmio(struct vfio_platform_region region,
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struct vm_area_struct *vma)
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{
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u64 req_len, pgoff, req_start;
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req_len = vma->vm_end - vma->vm_start;
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pgoff = vma->vm_pgoff &
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((1U << (VFIO_PLATFORM_OFFSET_SHIFT - PAGE_SHIFT)) - 1);
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req_start = pgoff << PAGE_SHIFT;
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if (region.size < PAGE_SIZE || req_start + req_len > region.size)
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return -EINVAL;
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vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
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vma->vm_pgoff = (region.addr >> PAGE_SHIFT) + pgoff;
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return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
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req_len, vma->vm_page_prot);
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}
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static int vfio_platform_mmap(void *device_data, struct vm_area_struct *vma)
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{
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struct vfio_platform_device *vdev = device_data;
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unsigned int index;
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index = vma->vm_pgoff >> (VFIO_PLATFORM_OFFSET_SHIFT - PAGE_SHIFT);
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if (vma->vm_end < vma->vm_start)
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return -EINVAL;
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if (!(vma->vm_flags & VM_SHARED))
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return -EINVAL;
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if (index >= vdev->num_regions)
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return -EINVAL;
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if (vma->vm_start & ~PAGE_MASK)
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return -EINVAL;
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if (vma->vm_end & ~PAGE_MASK)
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return -EINVAL;
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if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_MMAP))
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return -EINVAL;
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if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_READ)
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&& (vma->vm_flags & VM_READ))
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return -EINVAL;
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if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_WRITE)
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&& (vma->vm_flags & VM_WRITE))
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return -EINVAL;
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vma->vm_private_data = vdev;
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if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_MMIO)
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return vfio_platform_mmap_mmio(vdev->regions[index], vma);
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else if (vdev->regions[index].type & VFIO_PLATFORM_REGION_TYPE_PIO)
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return -EINVAL; /* not implemented */
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return -EINVAL;
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}
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static const struct vfio_device_ops vfio_platform_ops = {
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.name = "vfio-platform",
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.open = vfio_platform_open,
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.release = vfio_platform_release,
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.ioctl = vfio_platform_ioctl,
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.read = vfio_platform_read,
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.write = vfio_platform_write,
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.mmap = vfio_platform_mmap,
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};
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int vfio_platform_probe_common(struct vfio_platform_device *vdev,
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struct device *dev)
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{
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struct iommu_group *group;
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int ret;
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if (!vdev)
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return -EINVAL;
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group = iommu_group_get(dev);
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if (!group) {
|
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pr_err("VFIO: No IOMMU group for device %s\n", vdev->name);
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = vfio_add_group_dev(dev, &vfio_platform_ops, vdev);
|
|
if (ret) {
|
|
iommu_group_put(group);
|
|
return ret;
|
|
}
|
|
|
|
vfio_platform_get_reset(vdev, dev);
|
|
|
|
mutex_init(&vdev->igate);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vfio_platform_probe_common);
|
|
|
|
struct vfio_platform_device *vfio_platform_remove_common(struct device *dev)
|
|
{
|
|
struct vfio_platform_device *vdev;
|
|
|
|
vdev = vfio_del_group_dev(dev);
|
|
|
|
if (vdev) {
|
|
vfio_platform_put_reset(vdev);
|
|
iommu_group_put(dev->iommu_group);
|
|
}
|
|
|
|
return vdev;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vfio_platform_remove_common);
|