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path: root/drivers/vfio/fsl-mc
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-rw-r--r--drivers/vfio/fsl-mc/Kconfig9
-rw-r--r--drivers/vfio/fsl-mc/Makefile4
-rw-r--r--drivers/vfio/fsl-mc/vfio_fsl_mc.c683
-rw-r--r--drivers/vfio/fsl-mc/vfio_fsl_mc_intr.c194
-rw-r--r--drivers/vfio/fsl-mc/vfio_fsl_mc_private.h55
5 files changed, 945 insertions, 0 deletions
diff --git a/drivers/vfio/fsl-mc/Kconfig b/drivers/vfio/fsl-mc/Kconfig
new file mode 100644
index 000000000000..b1a527d6b6f2
--- /dev/null
+++ b/drivers/vfio/fsl-mc/Kconfig
@@ -0,0 +1,9 @@
+config VFIO_FSL_MC
+ tristate "VFIO support for QorIQ DPAA2 fsl-mc bus devices"
+ depends on VFIO && FSL_MC_BUS && EVENTFD
+ help
+ Driver to enable support for the VFIO QorIQ DPAA2 fsl-mc
+ (Management Complex) devices. This is required to passthrough
+ fsl-mc bus devices using the VFIO framework.
+
+ If you don't know what to do here, say N.
diff --git a/drivers/vfio/fsl-mc/Makefile b/drivers/vfio/fsl-mc/Makefile
new file mode 100644
index 000000000000..cad6dbf0b735
--- /dev/null
+++ b/drivers/vfio/fsl-mc/Makefile
@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
+
+vfio-fsl-mc-y := vfio_fsl_mc.o vfio_fsl_mc_intr.o
+obj-$(CONFIG_VFIO_FSL_MC) += vfio-fsl-mc.o
diff --git a/drivers/vfio/fsl-mc/vfio_fsl_mc.c b/drivers/vfio/fsl-mc/vfio_fsl_mc.c
new file mode 100644
index 000000000000..0113a980f974
--- /dev/null
+++ b/drivers/vfio/fsl-mc/vfio_fsl_mc.c
@@ -0,0 +1,683 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
+/*
+ * Copyright 2013-2016 Freescale Semiconductor Inc.
+ * Copyright 2016-2017,2019-2020 NXP
+ */
+
+#include <linux/device.h>
+#include <linux/iommu.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/vfio.h>
+#include <linux/fsl/mc.h>
+#include <linux/delay.h>
+#include <linux/io-64-nonatomic-hi-lo.h>
+
+#include "vfio_fsl_mc_private.h"
+
+static struct fsl_mc_driver vfio_fsl_mc_driver;
+
+static DEFINE_MUTEX(reflck_lock);
+
+static void vfio_fsl_mc_reflck_get(struct vfio_fsl_mc_reflck *reflck)
+{
+ kref_get(&reflck->kref);
+}
+
+static void vfio_fsl_mc_reflck_release(struct kref *kref)
+{
+ struct vfio_fsl_mc_reflck *reflck = container_of(kref,
+ struct vfio_fsl_mc_reflck,
+ kref);
+
+ mutex_destroy(&reflck->lock);
+ kfree(reflck);
+ mutex_unlock(&reflck_lock);
+}
+
+static void vfio_fsl_mc_reflck_put(struct vfio_fsl_mc_reflck *reflck)
+{
+ kref_put_mutex(&reflck->kref, vfio_fsl_mc_reflck_release, &reflck_lock);
+}
+
+static struct vfio_fsl_mc_reflck *vfio_fsl_mc_reflck_alloc(void)
+{
+ struct vfio_fsl_mc_reflck *reflck;
+
+ reflck = kzalloc(sizeof(*reflck), GFP_KERNEL);
+ if (!reflck)
+ return ERR_PTR(-ENOMEM);
+
+ kref_init(&reflck->kref);
+ mutex_init(&reflck->lock);
+
+ return reflck;
+}
+
+static int vfio_fsl_mc_reflck_attach(struct vfio_fsl_mc_device *vdev)
+{
+ int ret = 0;
+
+ mutex_lock(&reflck_lock);
+ if (is_fsl_mc_bus_dprc(vdev->mc_dev)) {
+ vdev->reflck = vfio_fsl_mc_reflck_alloc();
+ ret = PTR_ERR_OR_ZERO(vdev->reflck);
+ } else {
+ struct device *mc_cont_dev = vdev->mc_dev->dev.parent;
+ struct vfio_device *device;
+ struct vfio_fsl_mc_device *cont_vdev;
+
+ device = vfio_device_get_from_dev(mc_cont_dev);
+ if (!device) {
+ ret = -ENODEV;
+ goto unlock;
+ }
+
+ cont_vdev = vfio_device_data(device);
+ if (!cont_vdev || !cont_vdev->reflck) {
+ vfio_device_put(device);
+ ret = -ENODEV;
+ goto unlock;
+ }
+ vfio_fsl_mc_reflck_get(cont_vdev->reflck);
+ vdev->reflck = cont_vdev->reflck;
+ vfio_device_put(device);
+ }
+
+unlock:
+ mutex_unlock(&reflck_lock);
+ return ret;
+}
+
+static int vfio_fsl_mc_regions_init(struct vfio_fsl_mc_device *vdev)
+{
+ struct fsl_mc_device *mc_dev = vdev->mc_dev;
+ int count = mc_dev->obj_desc.region_count;
+ int i;
+
+ vdev->regions = kcalloc(count, sizeof(struct vfio_fsl_mc_region),
+ GFP_KERNEL);
+ if (!vdev->regions)
+ return -ENOMEM;
+
+ for (i = 0; i < count; i++) {
+ struct resource *res = &mc_dev->regions[i];
+ int no_mmap = is_fsl_mc_bus_dprc(mc_dev);
+
+ vdev->regions[i].addr = res->start;
+ vdev->regions[i].size = resource_size(res);
+ vdev->regions[i].type = mc_dev->regions[i].flags & IORESOURCE_BITS;
+ /*
+ * Only regions addressed with PAGE granularity may be
+ * MMAPed securely.
+ */
+ if (!no_mmap && !(vdev->regions[i].addr & ~PAGE_MASK) &&
+ !(vdev->regions[i].size & ~PAGE_MASK))
+ vdev->regions[i].flags |=
+ VFIO_REGION_INFO_FLAG_MMAP;
+ vdev->regions[i].flags |= VFIO_REGION_INFO_FLAG_READ;
+ if (!(mc_dev->regions[i].flags & IORESOURCE_READONLY))
+ vdev->regions[i].flags |= VFIO_REGION_INFO_FLAG_WRITE;
+ }
+
+ return 0;
+}
+
+static void vfio_fsl_mc_regions_cleanup(struct vfio_fsl_mc_device *vdev)
+{
+ struct fsl_mc_device *mc_dev = vdev->mc_dev;
+ int i;
+
+ for (i = 0; i < mc_dev->obj_desc.region_count; i++)
+ iounmap(vdev->regions[i].ioaddr);
+ kfree(vdev->regions);
+}
+
+static int vfio_fsl_mc_open(void *device_data)
+{
+ struct vfio_fsl_mc_device *vdev = device_data;
+ int ret;
+
+ if (!try_module_get(THIS_MODULE))
+ return -ENODEV;
+
+ mutex_lock(&vdev->reflck->lock);
+ if (!vdev->refcnt) {
+ ret = vfio_fsl_mc_regions_init(vdev);
+ if (ret)
+ goto err_reg_init;
+ }
+ vdev->refcnt++;
+
+ mutex_unlock(&vdev->reflck->lock);
+
+ return 0;
+
+err_reg_init:
+ mutex_unlock(&vdev->reflck->lock);
+ module_put(THIS_MODULE);
+ return ret;
+}
+
+static void vfio_fsl_mc_release(void *device_data)
+{
+ struct vfio_fsl_mc_device *vdev = device_data;
+ int ret;
+
+ mutex_lock(&vdev->reflck->lock);
+
+ if (!(--vdev->refcnt)) {
+ struct fsl_mc_device *mc_dev = vdev->mc_dev;
+ struct device *cont_dev = fsl_mc_cont_dev(&mc_dev->dev);
+ struct fsl_mc_device *mc_cont = to_fsl_mc_device(cont_dev);
+
+ vfio_fsl_mc_regions_cleanup(vdev);
+
+ /* reset the device before cleaning up the interrupts */
+ ret = dprc_reset_container(mc_cont->mc_io, 0,
+ mc_cont->mc_handle,
+ mc_cont->obj_desc.id,
+ DPRC_RESET_OPTION_NON_RECURSIVE);
+
+ if (ret) {
+ dev_warn(&mc_cont->dev, "VFIO_FLS_MC: reset device has failed (%d)\n",
+ ret);
+ WARN_ON(1);
+ }
+
+ vfio_fsl_mc_irqs_cleanup(vdev);
+
+ fsl_mc_cleanup_irq_pool(mc_cont);
+ }
+
+ mutex_unlock(&vdev->reflck->lock);
+
+ module_put(THIS_MODULE);
+}
+
+static long vfio_fsl_mc_ioctl(void *device_data, unsigned int cmd,
+ unsigned long arg)
+{
+ unsigned long minsz;
+ struct vfio_fsl_mc_device *vdev = device_data;
+ struct fsl_mc_device *mc_dev = vdev->mc_dev;
+
+ switch (cmd) {
+ case VFIO_DEVICE_GET_INFO:
+ {
+ struct vfio_device_info info;
+
+ minsz = offsetofend(struct vfio_device_info, num_irqs);
+
+ if (copy_from_user(&info, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (info.argsz < minsz)
+ return -EINVAL;
+
+ info.flags = VFIO_DEVICE_FLAGS_FSL_MC;
+
+ if (is_fsl_mc_bus_dprc(mc_dev))
+ info.flags |= VFIO_DEVICE_FLAGS_RESET;
+
+ info.num_regions = mc_dev->obj_desc.region_count;
+ info.num_irqs = mc_dev->obj_desc.irq_count;
+
+ return copy_to_user((void __user *)arg, &info, minsz) ?
+ -EFAULT : 0;
+ }
+ case VFIO_DEVICE_GET_REGION_INFO:
+ {
+ struct vfio_region_info info;
+
+ minsz = offsetofend(struct vfio_region_info, offset);
+
+ if (copy_from_user(&info, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (info.argsz < minsz)
+ return -EINVAL;
+
+ if (info.index >= mc_dev->obj_desc.region_count)
+ return -EINVAL;
+
+ /* map offset to the physical address */
+ info.offset = VFIO_FSL_MC_INDEX_TO_OFFSET(info.index);
+ info.size = vdev->regions[info.index].size;
+ info.flags = vdev->regions[info.index].flags;
+
+ return copy_to_user((void __user *)arg, &info, minsz);
+ }
+ case VFIO_DEVICE_GET_IRQ_INFO:
+ {
+ struct vfio_irq_info info;
+
+ minsz = offsetofend(struct vfio_irq_info, count);
+ if (copy_from_user(&info, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (info.argsz < minsz)
+ return -EINVAL;
+
+ if (info.index >= mc_dev->obj_desc.irq_count)
+ return -EINVAL;
+
+ info.flags = VFIO_IRQ_INFO_EVENTFD;
+ info.count = 1;
+
+ return copy_to_user((void __user *)arg, &info, minsz);
+ }
+ case VFIO_DEVICE_SET_IRQS:
+ {
+ struct vfio_irq_set hdr;
+ u8 *data = NULL;
+ int ret = 0;
+ size_t data_size = 0;
+
+ minsz = offsetofend(struct vfio_irq_set, count);
+
+ if (copy_from_user(&hdr, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ ret = vfio_set_irqs_validate_and_prepare(&hdr, mc_dev->obj_desc.irq_count,
+ mc_dev->obj_desc.irq_count, &data_size);
+ if (ret)
+ return ret;
+
+ if (data_size) {
+ data = memdup_user((void __user *)(arg + minsz),
+ data_size);
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+ }
+
+ mutex_lock(&vdev->igate);
+ ret = vfio_fsl_mc_set_irqs_ioctl(vdev, hdr.flags,
+ hdr.index, hdr.start,
+ hdr.count, data);
+ mutex_unlock(&vdev->igate);
+ kfree(data);
+
+ return ret;
+ }
+ case VFIO_DEVICE_RESET:
+ {
+ int ret;
+ struct fsl_mc_device *mc_dev = vdev->mc_dev;
+
+ /* reset is supported only for the DPRC */
+ if (!is_fsl_mc_bus_dprc(mc_dev))
+ return -ENOTTY;
+
+ ret = dprc_reset_container(mc_dev->mc_io, 0,
+ mc_dev->mc_handle,
+ mc_dev->obj_desc.id,
+ DPRC_RESET_OPTION_NON_RECURSIVE);
+ return ret;
+
+ }
+ default:
+ return -ENOTTY;
+ }
+}
+
+static ssize_t vfio_fsl_mc_read(void *device_data, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct vfio_fsl_mc_device *vdev = device_data;
+ unsigned int index = VFIO_FSL_MC_OFFSET_TO_INDEX(*ppos);
+ loff_t off = *ppos & VFIO_FSL_MC_OFFSET_MASK;
+ struct fsl_mc_device *mc_dev = vdev->mc_dev;
+ struct vfio_fsl_mc_region *region;
+ u64 data[8];
+ int i;
+
+ if (index >= mc_dev->obj_desc.region_count)
+ return -EINVAL;
+
+ region = &vdev->regions[index];
+
+ if (!(region->flags & VFIO_REGION_INFO_FLAG_READ))
+ return -EINVAL;
+
+ if (!region->ioaddr) {
+ region->ioaddr = ioremap(region->addr, region->size);
+ if (!region->ioaddr)
+ return -ENOMEM;
+ }
+
+ if (count != 64 || off != 0)
+ return -EINVAL;
+
+ for (i = 7; i >= 0; i--)
+ data[i] = readq(region->ioaddr + i * sizeof(uint64_t));
+
+ if (copy_to_user(buf, data, 64))
+ return -EFAULT;
+
+ return count;
+}
+
+#define MC_CMD_COMPLETION_TIMEOUT_MS 5000
+#define MC_CMD_COMPLETION_POLLING_MAX_SLEEP_USECS 500
+
+static int vfio_fsl_mc_send_command(void __iomem *ioaddr, uint64_t *cmd_data)
+{
+ int i;
+ enum mc_cmd_status status;
+ unsigned long timeout_usecs = MC_CMD_COMPLETION_TIMEOUT_MS * 1000;
+
+ /* Write at command parameter into portal */
+ for (i = 7; i >= 1; i--)
+ writeq_relaxed(cmd_data[i], ioaddr + i * sizeof(uint64_t));
+
+ /* Write command header in the end */
+ writeq(cmd_data[0], ioaddr);
+
+ /* Wait for response before returning to user-space
+ * This can be optimized in future to even prepare response
+ * before returning to user-space and avoid read ioctl.
+ */
+ for (;;) {
+ u64 header;
+ struct mc_cmd_header *resp_hdr;
+
+ header = cpu_to_le64(readq_relaxed(ioaddr));
+
+ resp_hdr = (struct mc_cmd_header *)&header;
+ status = (enum mc_cmd_status)resp_hdr->status;
+ if (status != MC_CMD_STATUS_READY)
+ break;
+
+ udelay(MC_CMD_COMPLETION_POLLING_MAX_SLEEP_USECS);
+ timeout_usecs -= MC_CMD_COMPLETION_POLLING_MAX_SLEEP_USECS;
+ if (timeout_usecs == 0)
+ return -ETIMEDOUT;
+ }
+
+ return 0;
+}
+
+static ssize_t vfio_fsl_mc_write(void *device_data, const char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ struct vfio_fsl_mc_device *vdev = device_data;
+ unsigned int index = VFIO_FSL_MC_OFFSET_TO_INDEX(*ppos);
+ loff_t off = *ppos & VFIO_FSL_MC_OFFSET_MASK;
+ struct fsl_mc_device *mc_dev = vdev->mc_dev;
+ struct vfio_fsl_mc_region *region;
+ u64 data[8];
+ int ret;
+
+ if (index >= mc_dev->obj_desc.region_count)
+ return -EINVAL;
+
+ region = &vdev->regions[index];
+
+ if (!(region->flags & VFIO_REGION_INFO_FLAG_WRITE))
+ return -EINVAL;
+
+ if (!region->ioaddr) {
+ region->ioaddr = ioremap(region->addr, region->size);
+ if (!region->ioaddr)
+ return -ENOMEM;
+ }
+
+ if (count != 64 || off != 0)
+ return -EINVAL;
+
+ if (copy_from_user(&data, buf, 64))
+ return -EFAULT;
+
+ ret = vfio_fsl_mc_send_command(region->ioaddr, data);
+ if (ret)
+ return ret;
+
+ return count;
+
+}
+
+static int vfio_fsl_mc_mmap_mmio(struct vfio_fsl_mc_region region,
+ struct vm_area_struct *vma)
+{
+ u64 size = vma->vm_end - vma->vm_start;
+ u64 pgoff, base;
+ u8 region_cacheable;
+
+ pgoff = vma->vm_pgoff &
+ ((1U << (VFIO_FSL_MC_OFFSET_SHIFT - PAGE_SHIFT)) - 1);
+ base = pgoff << PAGE_SHIFT;
+
+ if (region.size < PAGE_SIZE || base + size > region.size)
+ return -EINVAL;
+
+ region_cacheable = (region.type & FSL_MC_REGION_CACHEABLE) &&
+ (region.type & FSL_MC_REGION_SHAREABLE);
+ if (!region_cacheable)
+ vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+
+ vma->vm_pgoff = (region.addr >> PAGE_SHIFT) + pgoff;
+
+ return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
+ size, vma->vm_page_prot);
+}
+
+static int vfio_fsl_mc_mmap(void *device_data, struct vm_area_struct *vma)
+{
+ struct vfio_fsl_mc_device *vdev = device_data;
+ struct fsl_mc_device *mc_dev = vdev->mc_dev;
+ int index;
+
+ index = vma->vm_pgoff >> (VFIO_FSL_MC_OFFSET_SHIFT - PAGE_SHIFT);
+
+ if (vma->vm_end < vma->vm_start)
+ return -EINVAL;
+ if (vma->vm_start & ~PAGE_MASK)
+ return -EINVAL;
+ if (vma->vm_end & ~PAGE_MASK)
+ return -EINVAL;
+ if (!(vma->vm_flags & VM_SHARED))
+ return -EINVAL;
+ if (index >= mc_dev->obj_desc.region_count)
+ return -EINVAL;
+
+ if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_MMAP))
+ return -EINVAL;
+
+ if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_READ)
+ && (vma->vm_flags & VM_READ))
+ return -EINVAL;
+
+ if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_WRITE)
+ && (vma->vm_flags & VM_WRITE))
+ return -EINVAL;
+
+ vma->vm_private_data = mc_dev;
+
+ return vfio_fsl_mc_mmap_mmio(vdev->regions[index], vma);
+}
+
+static const struct vfio_device_ops vfio_fsl_mc_ops = {
+ .name = "vfio-fsl-mc",
+ .open = vfio_fsl_mc_open,
+ .release = vfio_fsl_mc_release,
+ .ioctl = vfio_fsl_mc_ioctl,
+ .read = vfio_fsl_mc_read,
+ .write = vfio_fsl_mc_write,
+ .mmap = vfio_fsl_mc_mmap,
+};
+
+static int vfio_fsl_mc_bus_notifier(struct notifier_block *nb,
+ unsigned long action, void *data)
+{
+ struct vfio_fsl_mc_device *vdev = container_of(nb,
+ struct vfio_fsl_mc_device, nb);
+ struct device *dev = data;
+ struct fsl_mc_device *mc_dev = to_fsl_mc_device(dev);
+ struct fsl_mc_device *mc_cont = to_fsl_mc_device(mc_dev->dev.parent);
+
+ if (action == BUS_NOTIFY_ADD_DEVICE &&
+ vdev->mc_dev == mc_cont) {
+ mc_dev->driver_override = kasprintf(GFP_KERNEL, "%s",
+ vfio_fsl_mc_ops.name);
+ if (!mc_dev->driver_override)
+ dev_warn(dev, "VFIO_FSL_MC: Setting driver override for device in dprc %s failed\n",
+ dev_name(&mc_cont->dev));
+ else
+ dev_info(dev, "VFIO_FSL_MC: Setting driver override for device in dprc %s\n",
+ dev_name(&mc_cont->dev));
+ } else if (action == BUS_NOTIFY_BOUND_DRIVER &&
+ vdev->mc_dev == mc_cont) {
+ struct fsl_mc_driver *mc_drv = to_fsl_mc_driver(dev->driver);
+
+ if (mc_drv && mc_drv != &vfio_fsl_mc_driver)
+ dev_warn(dev, "VFIO_FSL_MC: Object %s bound to driver %s while DPRC bound to vfio-fsl-mc\n",
+ dev_name(dev), mc_drv->driver.name);
+ }
+
+ return 0;
+}
+
+static int vfio_fsl_mc_init_device(struct vfio_fsl_mc_device *vdev)
+{
+ struct fsl_mc_device *mc_dev = vdev->mc_dev;
+ int ret;
+
+ /* Non-dprc devices share mc_io from parent */
+ if (!is_fsl_mc_bus_dprc(mc_dev)) {
+ struct fsl_mc_device *mc_cont = to_fsl_mc_device(mc_dev->dev.parent);
+
+ mc_dev->mc_io = mc_cont->mc_io;
+ return 0;
+ }
+
+ vdev->nb.notifier_call = vfio_fsl_mc_bus_notifier;
+ ret = bus_register_notifier(&fsl_mc_bus_type, &vdev->nb);
+ if (ret)
+ return ret;
+
+ /* open DPRC, allocate a MC portal */
+ ret = dprc_setup(mc_dev);
+ if (ret) {
+ dev_err(&mc_dev->dev, "VFIO_FSL_MC: Failed to setup DPRC (%d)\n", ret);
+ goto out_nc_unreg;
+ }
+
+ ret = dprc_scan_container(mc_dev, false);
+ if (ret) {
+ dev_err(&mc_dev->dev, "VFIO_FSL_MC: Container scanning failed (%d)\n", ret);
+ goto out_dprc_cleanup;
+ }
+
+ return 0;
+
+out_dprc_cleanup:
+ dprc_remove_devices(mc_dev, NULL, 0);
+ dprc_cleanup(mc_dev);
+out_nc_unreg:
+ bus_unregister_notifier(&fsl_mc_bus_type, &vdev->nb);
+ vdev->nb.notifier_call = NULL;
+
+ return ret;
+}
+
+static int vfio_fsl_mc_probe(struct fsl_mc_device *mc_dev)
+{
+ struct iommu_group *group;
+ struct vfio_fsl_mc_device *vdev;
+ struct device *dev = &mc_dev->dev;
+ int ret;
+
+ group = vfio_iommu_group_get(dev);
+ if (!group) {
+ dev_err(dev, "VFIO_FSL_MC: No IOMMU group\n");
+ return -EINVAL;
+ }
+
+ vdev = devm_kzalloc(dev, sizeof(*vdev), GFP_KERNEL);
+ if (!vdev) {
+ ret = -ENOMEM;
+ goto out_group_put;
+ }
+
+ vdev->mc_dev = mc_dev;
+
+ ret = vfio_add_group_dev(dev, &vfio_fsl_mc_ops, vdev);
+ if (ret) {
+ dev_err(dev, "VFIO_FSL_MC: Failed to add to vfio group\n");
+ goto out_group_put;
+ }
+
+ ret = vfio_fsl_mc_reflck_attach(vdev);
+ if (ret)
+ goto out_group_dev;
+
+ ret = vfio_fsl_mc_init_device(vdev);
+ if (ret)
+ goto out_reflck;
+
+ mutex_init(&vdev->igate);
+
+ return 0;
+
+out_reflck:
+ vfio_fsl_mc_reflck_put(vdev->reflck);
+out_group_dev:
+ vfio_del_group_dev(dev);
+out_group_put:
+ vfio_iommu_group_put(group, dev);
+ return ret;
+}
+
+static int vfio_fsl_mc_remove(struct fsl_mc_device *mc_dev)
+{
+ struct vfio_fsl_mc_device *vdev;
+ struct device *dev = &mc_dev->dev;
+
+ vdev = vfio_del_group_dev(dev);
+ if (!vdev)
+ return -EINVAL;
+
+ mutex_destroy(&vdev->igate);
+
+ vfio_fsl_mc_reflck_put(vdev->reflck);
+
+ if (is_fsl_mc_bus_dprc(mc_dev)) {
+ dprc_remove_devices(mc_dev, NULL, 0);
+ dprc_cleanup(mc_dev);
+ }
+
+ if (vdev->nb.notifier_call)
+ bus_unregister_notifier(&fsl_mc_bus_type, &vdev->nb);
+
+ vfio_iommu_group_put(mc_dev->dev.iommu_group, dev);
+
+ return 0;
+}
+
+static struct fsl_mc_driver vfio_fsl_mc_driver = {
+ .probe = vfio_fsl_mc_probe,
+ .remove = vfio_fsl_mc_remove,
+ .driver = {
+ .name = "vfio-fsl-mc",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init vfio_fsl_mc_driver_init(void)
+{
+ return fsl_mc_driver_register(&vfio_fsl_mc_driver);
+}
+
+static void __exit vfio_fsl_mc_driver_exit(void)
+{
+ fsl_mc_driver_unregister(&vfio_fsl_mc_driver);
+}
+
+module_init(vfio_fsl_mc_driver_init);
+module_exit(vfio_fsl_mc_driver_exit);
+
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_DESCRIPTION("VFIO for FSL-MC devices - User Level meta-driver");
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 000000000000..c80dceb46f79
--- /dev/null
+++ b/drivers/vfio/fsl-mc/vfio_fsl_mc_intr.c
@@ -0,0 +1,194 @@
+// 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"
+
+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]->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;
+}
+
+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->reflck->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->reflck->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]->msi_desc->irq;
+
+ 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->reflck->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;
+}
diff --git a/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h b/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h
new file mode 100644
index 000000000000..a97ee691ed47
--- /dev/null
+++ b/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h
@@ -0,0 +1,55 @@
+/* SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause) */
+/*
+ * Copyright 2013-2016 Freescale Semiconductor Inc.
+ * Copyright 2016,2019-2020 NXP
+ */
+
+#ifndef VFIO_FSL_MC_PRIVATE_H
+#define VFIO_FSL_MC_PRIVATE_H
+
+#define VFIO_FSL_MC_OFFSET_SHIFT 40
+#define VFIO_FSL_MC_OFFSET_MASK (((u64)(1) << VFIO_FSL_MC_OFFSET_SHIFT) - 1)
+
+#define VFIO_FSL_MC_OFFSET_TO_INDEX(off) ((off) >> VFIO_FSL_MC_OFFSET_SHIFT)
+
+#define VFIO_FSL_MC_INDEX_TO_OFFSET(index) \
+ ((u64)(index) << VFIO_FSL_MC_OFFSET_SHIFT)
+
+struct vfio_fsl_mc_irq {
+ u32 flags;
+ u32 count;
+ struct eventfd_ctx *trigger;
+ char *name;
+};
+
+struct vfio_fsl_mc_reflck {
+ struct kref kref;
+ struct mutex lock;
+};
+
+struct vfio_fsl_mc_region {
+ u32 flags;
+ u32 type;
+ u64 addr;
+ resource_size_t size;
+ void __iomem *ioaddr;
+};
+
+struct vfio_fsl_mc_device {
+ struct fsl_mc_device *mc_dev;
+ struct notifier_block nb;
+ int refcnt;
+ struct vfio_fsl_mc_region *regions;
+ struct vfio_fsl_mc_reflck *reflck;
+ struct mutex igate;
+ struct vfio_fsl_mc_irq *mc_irqs;
+};
+
+extern 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);
+
+void vfio_fsl_mc_irqs_cleanup(struct vfio_fsl_mc_device *vdev);
+
+#endif /* VFIO_FSL_MC_PRIVATE_H */
generated by cgit (git 2.34.1) at 2024-06-09 22:43:10 +0000