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freifunkist-firmware/target/linux/layerscape/patches-4.14/808-vfio-support-layerscape...

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From 92f0ef51270b2961f63b2e985831f5e9a6251a2f Mon Sep 17 00:00:00 2001
From: Biwen Li <biwen.li@nxp.com>
Date: Tue, 30 Oct 2018 18:29:03 +0800
Subject: [PATCH 25/40] vfio: support layerscape
This is an integrated patch of vfio for layerscape
Signed-off-by: Bharat Bhushan <Bharat.Bhushan@nxp.com>
Signed-off-by: Biwen Li <biwen.li@nxp.com>
---
drivers/vfio/Kconfig | 1 +
drivers/vfio/Makefile | 1 +
drivers/vfio/fsl-mc/Kconfig | 9 +
drivers/vfio/fsl-mc/Makefile | 2 +
drivers/vfio/fsl-mc/vfio_fsl_mc.c | 751 ++++++++++++++++++++++
drivers/vfio/fsl-mc/vfio_fsl_mc_intr.c | 199 ++++++
drivers/vfio/fsl-mc/vfio_fsl_mc_private.h | 55 ++
include/uapi/linux/vfio.h | 1 +
8 files changed, 1019 insertions(+)
create mode 100644 drivers/vfio/fsl-mc/Kconfig
create mode 100644 drivers/vfio/fsl-mc/Makefile
create mode 100644 drivers/vfio/fsl-mc/vfio_fsl_mc.c
create mode 100644 drivers/vfio/fsl-mc/vfio_fsl_mc_intr.c
create mode 100644 drivers/vfio/fsl-mc/vfio_fsl_mc_private.h
--- a/drivers/vfio/Kconfig
+++ b/drivers/vfio/Kconfig
@@ -47,4 +47,5 @@ menuconfig VFIO_NOIOMMU
source "drivers/vfio/pci/Kconfig"
source "drivers/vfio/platform/Kconfig"
source "drivers/vfio/mdev/Kconfig"
+source "drivers/vfio/fsl-mc/Kconfig"
source "virt/lib/Kconfig"
--- a/drivers/vfio/Makefile
+++ b/drivers/vfio/Makefile
@@ -9,3 +9,4 @@ obj-$(CONFIG_VFIO_SPAPR_EEH) += vfio_spa
obj-$(CONFIG_VFIO_PCI) += pci/
obj-$(CONFIG_VFIO_PLATFORM) += platform/
obj-$(CONFIG_VFIO_MDEV) += mdev/
+obj-$(CONFIG_VFIO_FSL_MC) += fsl-mc/
--- /dev/null
+++ b/drivers/vfio/fsl-mc/Kconfig
@@ -0,0 +1,9 @@
+config VFIO_FSL_MC
+ tristate "VFIO support for QorIQ DPAA2 fsl-mc bus devices"
+ depends on VFIO && FSL_MC_BUS && EVENTFD
+ help
+ Driver to enable support for the VFIO QorIQ DPAA2 fsl-mc
+ (Management Complex) devices. This is required to passthrough
+ fsl-mc bus devices using the VFIO framework.
+
+ If you don't know what to do here, say N.
--- /dev/null
+++ b/drivers/vfio/fsl-mc/Makefile
@@ -0,0 +1,2 @@
+vfio-fsl_mc-y := vfio_fsl_mc.o
+obj-$(CONFIG_VFIO_FSL_MC) += vfio_fsl_mc.o vfio_fsl_mc_intr.o
--- /dev/null
+++ b/drivers/vfio/fsl-mc/vfio_fsl_mc.c
@@ -0,0 +1,751 @@
+/*
+ * Freescale Management Complex (MC) device passthrough using VFIO
+ *
+ * Copyright (C) 2013-2016 Freescale Semiconductor, Inc.
+ * Copyright 2016-2017 NXP
+ * 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/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/delay.h>
+#include <linux/fsl/mc.h>
+
+#include "vfio_fsl_mc_private.h"
+
+#define DRIVER_VERSION "0.10"
+#define DRIVER_AUTHOR "Bharat Bhushan <bharat.bhushan@nxp.com>"
+#define DRIVER_DESC "VFIO for FSL-MC devices - User Level meta-driver"
+
+static DEFINE_MUTEX(driver_lock);
+
+/* FSl-MC device regions (address and size) are aligned to 64K.
+ * While MC firmware reports size less than 64K for some objects (it actually
+ * reports size which does not include reserved space beyond valid bytes).
+ * Align the size to PAGE_SIZE for userspace to mmap.
+ */
+static size_t aligned_region_size(struct fsl_mc_device *mc_dev, int index)
+{
+ size_t size;
+
+ size = resource_size(&mc_dev->regions[index]);
+ return PAGE_ALIGN(size);
+}
+
+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 < mc_dev->obj_desc.region_count; i++) {
+ vdev->regions[i].addr = mc_dev->regions[i].start;
+ vdev->regions[i].size = aligned_region_size(mc_dev, i);
+ vdev->regions[i].type = VFIO_FSL_MC_REGION_TYPE_MMIO;
+ if (mc_dev->regions[i].flags & IORESOURCE_CACHEABLE)
+ vdev->regions[i].type |=
+ VFIO_FSL_MC_REGION_TYPE_CACHEABLE;
+ 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;
+ }
+
+ vdev->num_regions = mc_dev->obj_desc.region_count;
+ return 0;
+}
+
+static void vfio_fsl_mc_regions_cleanup(struct vfio_fsl_mc_device *vdev)
+{
+ int i;
+
+ for (i = 0; i < vdev->num_regions; i++)
+ iounmap(vdev->regions[i].ioaddr);
+
+ vdev->num_regions = 0;
+ 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(&driver_lock);
+ if (!vdev->refcnt) {
+ ret = vfio_fsl_mc_regions_init(vdev);
+ if (ret)
+ goto error_region_init;
+
+ ret = vfio_fsl_mc_irqs_init(vdev);
+ if (ret)
+ goto error_irq_init;
+ }
+
+ vdev->refcnt++;
+ mutex_unlock(&driver_lock);
+ return 0;
+
+error_irq_init:
+ vfio_fsl_mc_regions_cleanup(vdev);
+error_region_init:
+ mutex_unlock(&driver_lock);
+ if (ret)
+ module_put(THIS_MODULE);
+
+ return ret;
+}
+
+static void vfio_fsl_mc_release(void *device_data)
+{
+ struct vfio_fsl_mc_device *vdev = device_data;
+ struct fsl_mc_device *mc_dev = vdev->mc_dev;
+
+ mutex_lock(&driver_lock);
+
+ if (!(--vdev->refcnt)) {
+ vfio_fsl_mc_regions_cleanup(vdev);
+ vfio_fsl_mc_irqs_cleanup(vdev);
+ }
+
+ if (strcmp(mc_dev->obj_desc.type, "dprc") == 0)
+ dprc_reset_container(mc_dev->mc_io, 0, mc_dev->mc_handle,
+ mc_dev->obj_desc.id);
+
+ mutex_unlock(&driver_lock);
+
+ module_put(THIS_MODULE);
+}
+
+static long vfio_fsl_mc_ioctl(void *device_data, unsigned int cmd,
+ unsigned long arg)
+{
+ struct vfio_fsl_mc_device *vdev = device_data;
+ struct fsl_mc_device *mc_dev = vdev->mc_dev;
+ unsigned long minsz;
+
+ if (WARN_ON(!mc_dev))
+ return -ENODEV;
+
+ 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;
+ 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);
+ }
+ 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 >= vdev->num_regions)
+ 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;
+
+ if (vdev->mc_irqs != NULL) {
+ info.flags = vdev->mc_irqs[info.index].flags;
+ info.count = vdev->mc_irqs[info.index].count;
+ } else {
+ /*
+ * If IRQs are not initialized then these can not
+ * be configuted and used by user-space/
+ */
+ info.flags = 0;
+ info.count = 0;
+ }
+
+ 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;
+
+ minsz = offsetofend(struct vfio_irq_set, count);
+
+ if (copy_from_user(&hdr, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (hdr.argsz < minsz)
+ return -EINVAL;
+
+ if (hdr.index >= mc_dev->obj_desc.irq_count)
+ return -EINVAL;
+
+ if (hdr.start != 0 || hdr.count > 1)
+ return -EINVAL;
+
+ if (hdr.count == 0 &&
+ (!(hdr.flags & VFIO_IRQ_SET_DATA_NONE) ||
+ !(hdr.flags & VFIO_IRQ_SET_ACTION_TRIGGER)))
+ return -EINVAL;
+
+ if (hdr.flags & ~(VFIO_IRQ_SET_DATA_TYPE_MASK |
+ VFIO_IRQ_SET_ACTION_TYPE_MASK))
+ return -EINVAL;
+
+ if (!(hdr.flags & VFIO_IRQ_SET_DATA_NONE)) {
+ size_t size;
+
+ if (hdr.flags & VFIO_IRQ_SET_DATA_BOOL)
+ size = sizeof(uint8_t);
+ else if (hdr.flags & VFIO_IRQ_SET_DATA_EVENTFD)
+ size = sizeof(int32_t);
+ else
+ return -EINVAL;
+
+ if (hdr.argsz - minsz < hdr.count * size)
+ return -EINVAL;
+
+ data = memdup_user((void __user *)(arg + minsz),
+ hdr.count * size);
+ if (IS_ERR(data))
+ return PTR_ERR(data);
+ }
+
+ ret = vfio_fsl_mc_set_irqs_ioctl(vdev, hdr.flags,
+ hdr.index, hdr.start,
+ hdr.count, data);
+ return ret;
+ }
+ case VFIO_DEVICE_RESET:
+ {
+ return -EINVAL;
+ }
+ default:
+ return -EINVAL;
+ }
+}
+
+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 vfio_fsl_mc_region *region;
+ uint64_t data[8];
+ int i;
+
+ /* Read ioctl supported only for DPRC and DPMCP device */
+ if (strcmp(vdev->mc_dev->obj_desc.type, "dprc") &&
+ strcmp(vdev->mc_dev->obj_desc.type, "dpmcp"))
+ return -EINVAL;
+
+ if (index >= vdev->num_regions)
+ return -EINVAL;
+
+ region = &vdev->regions[index];
+
+ if (!(region->flags & VFIO_REGION_INFO_FLAG_READ))
+ return -EINVAL;
+
+ if (!region->type & VFIO_FSL_MC_REGION_TYPE_MMIO)
+ return -EINVAL;
+
+ if (!region->ioaddr) {
+ region->ioaddr = ioremap_nocache(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_dprc_wait_for_response(void __iomem *ioaddr)
+{
+ enum mc_cmd_status status;
+ unsigned long timeout_usecs = MC_CMD_COMPLETION_TIMEOUT_MS * 1000;
+
+ for (;;) {
+ u64 header;
+ struct mc_cmd_header *resp_hdr;
+
+ __iormb();
+ header = readq(ioaddr);
+ __iormb();
+
+ 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 int vfio_fsl_mc_send_command(void __iomem *ioaddr, uint64_t *cmd_data)
+{
+ int i;
+
+ /* Write at command header in the end */
+ for (i = 7; i >= 0; i--)
+ writeq(cmd_data[i], ioaddr + i * sizeof(uint64_t));
+
+ /* 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.
+ */
+ return vfio_fsl_mc_dprc_wait_for_response(ioaddr);
+}
+
+static int vfio_handle_dprc_commands(void __iomem *ioaddr, uint64_t *cmd_data)
+{
+ uint64_t cmd_hdr = cmd_data[0];
+ int cmd = (cmd_hdr >> 52) & 0xfff;
+
+ switch (cmd) {
+ case DPRC_CMDID_OPEN:
+ default:
+ return vfio_fsl_mc_send_command(ioaddr, cmd_data);
+ }
+
+ 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 vfio_fsl_mc_region *region;
+ uint64_t data[8];
+ int ret;
+
+ /* Write ioctl supported only for DPRC and DPMCP device */
+ if (strcmp(vdev->mc_dev->obj_desc.type, "dprc") &&
+ strcmp(vdev->mc_dev->obj_desc.type, "dpmcp"))
+ return -EINVAL;
+
+ if (index >= vdev->num_regions)
+ return -EINVAL;
+
+ region = &vdev->regions[index];
+
+ if (!(region->flags & VFIO_REGION_INFO_FLAG_WRITE))
+ return -EINVAL;
+
+ if (!region->type & VFIO_FSL_MC_REGION_TYPE_MMIO)
+ return -EINVAL;
+
+ if (!region->ioaddr) {
+ region->ioaddr = ioremap_nocache(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_handle_dprc_commands(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;
+
+ 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;
+ /*
+ * Set the REGION_TYPE_CACHEABLE (QBman CENA regs) to be the
+ * cache inhibited area of the portal to avoid coherency issues
+ * if a user migrates to another core.
+ */
+ if (region.type & VFIO_FSL_MC_REGION_TYPE_CACHEABLE)
+ vma->vm_page_prot = pgprot_cached_ns(vma->vm_page_prot);
+ else
+ 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);
+}
+
+/* Allows mmaping fsl_mc device regions in assigned DPRC */
+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;
+ unsigned long size, addr;
+ 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 >= vdev->num_regions)
+ 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;
+
+ addr = vdev->regions[index].addr;
+ size = vdev->regions[index].size;
+
+ vma->vm_private_data = mc_dev;
+
+ if (vdev->regions[index].type & VFIO_FSL_MC_REGION_TYPE_MMIO)
+ return vfio_fsl_mc_mmap_mmio(vdev->regions[index], vma);
+
+ return -EFAULT;
+}
+
+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_initialize_dprc(struct vfio_fsl_mc_device *vdev)
+{
+ struct device *root_dprc_dev;
+ struct fsl_mc_device *mc_dev = vdev->mc_dev;
+ struct device *dev = &mc_dev->dev;
+ struct fsl_mc_bus *mc_bus;
+ struct irq_domain *mc_msi_domain;
+ unsigned int irq_count;
+ int ret;
+
+ /* device must be DPRC */
+ if (strcmp(mc_dev->obj_desc.type, "dprc"))
+ return -EINVAL;
+
+ /* mc_io must be un-initialized */
+ WARN_ON(mc_dev->mc_io);
+
+ /* allocate a portal from the root DPRC for vfio use */
+ fsl_mc_get_root_dprc(dev, &root_dprc_dev);
+ if (WARN_ON(!root_dprc_dev))
+ return -EINVAL;
+
+ ret = fsl_mc_portal_allocate(to_fsl_mc_device(root_dprc_dev),
+ FSL_MC_IO_ATOMIC_CONTEXT_PORTAL,
+ &mc_dev->mc_io);
+ if (ret < 0)
+ goto clean_msi_domain;
+
+ /* Reset MCP before move on */
+ ret = fsl_mc_portal_reset(mc_dev->mc_io);
+ if (ret < 0) {
+ dev_err(dev, "dprc portal reset failed: error = %d\n", ret);
+ goto free_mc_portal;
+ }
+
+ /* MSI domain set up */
+ ret = fsl_mc_find_msi_domain(root_dprc_dev->parent, &mc_msi_domain);
+ if (ret < 0)
+ goto free_mc_portal;
+
+ dev_set_msi_domain(&mc_dev->dev, mc_msi_domain);
+
+ ret = dprc_open(mc_dev->mc_io, 0, mc_dev->obj_desc.id,
+ &mc_dev->mc_handle);
+ if (ret) {
+ dev_err(dev, "dprc_open() failed: error = %d\n", ret);
+ goto free_mc_portal;
+ }
+
+ /* Initialize resource pool */
+ fsl_mc_init_all_resource_pools(mc_dev);
+
+ mc_bus = to_fsl_mc_bus(mc_dev);
+
+ if (!mc_bus->irq_resources) {
+ irq_count = FSL_MC_IRQ_POOL_MAX_TOTAL_IRQS;
+ ret = fsl_mc_populate_irq_pool(mc_bus, irq_count);
+ if (ret < 0) {
+ dev_err(dev, "%s: Failed to init irq-pool\n", __func__);
+ goto clean_resource_pool;
+ }
+ }
+
+ mutex_init(&mc_bus->scan_mutex);
+
+ mutex_lock(&mc_bus->scan_mutex);
+ ret = dprc_scan_objects(mc_dev, mc_dev->driver_override,
+ &irq_count);
+ mutex_unlock(&mc_bus->scan_mutex);
+ if (ret) {
+ dev_err(dev, "dprc_scan_objects() fails (%d)\n", ret);
+ goto clean_irq_pool;
+ }
+
+ if (irq_count > FSL_MC_IRQ_POOL_MAX_TOTAL_IRQS) {
+ dev_warn(&mc_dev->dev,
+ "IRQs needed (%u) exceed IRQs preallocated (%u)\n",
+ irq_count, FSL_MC_IRQ_POOL_MAX_TOTAL_IRQS);
+ }
+
+ return 0;
+
+clean_irq_pool:
+ fsl_mc_cleanup_irq_pool(mc_bus);
+
+clean_resource_pool:
+ fsl_mc_cleanup_all_resource_pools(mc_dev);
+ dprc_close(mc_dev->mc_io, 0, mc_dev->mc_handle);
+
+free_mc_portal:
+ fsl_mc_portal_free(mc_dev->mc_io);
+
+clean_msi_domain:
+ dev_set_msi_domain(&mc_dev->dev, NULL);
+
+ return ret;
+}
+
+static int vfio_fsl_mc_device_remove(struct device *dev, void *data)
+{
+ struct fsl_mc_device *mc_dev;
+
+ WARN_ON(dev == NULL);
+
+ mc_dev = to_fsl_mc_device(dev);
+ if (WARN_ON(mc_dev == NULL))
+ return -ENODEV;
+
+ fsl_mc_device_remove(mc_dev);
+ return 0;
+}
+
+static void vfio_fsl_mc_cleanup_dprc(struct vfio_fsl_mc_device *vdev)
+{
+ struct fsl_mc_device *mc_dev = vdev->mc_dev;
+ struct fsl_mc_bus *mc_bus;
+
+ /* device must be DPRC */
+ if (strcmp(mc_dev->obj_desc.type, "dprc"))
+ return;
+
+ device_for_each_child(&mc_dev->dev, NULL, vfio_fsl_mc_device_remove);
+
+ mc_bus = to_fsl_mc_bus(mc_dev);
+ if (dev_get_msi_domain(&mc_dev->dev))
+ fsl_mc_cleanup_irq_pool(mc_bus);
+
+ dev_set_msi_domain(&mc_dev->dev, NULL);
+
+ fsl_mc_cleanup_all_resource_pools(mc_dev);
+ dprc_close(mc_dev->mc_io, 0, mc_dev->mc_handle);
+ fsl_mc_portal_free(mc_dev->mc_io);
+}
+
+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, "%s: VFIO: No IOMMU group\n", __func__);
+ return -EINVAL;
+ }
+
+ vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
+ if (!vdev) {
+ vfio_iommu_group_put(group, dev);
+ return -ENOMEM;
+ }
+
+ vdev->mc_dev = mc_dev;
+
+ ret = vfio_add_group_dev(dev, &vfio_fsl_mc_ops, vdev);
+ if (ret) {
+ dev_err(dev, "%s: Failed to add to vfio group\n", __func__);
+ goto free_vfio_device;
+ }
+
+ /* DPRC container scanned and it's chilren bound with vfio driver */
+ if (strcmp(mc_dev->obj_desc.type, "dprc") == 0) {
+ ret = vfio_fsl_mc_initialize_dprc(vdev);
+ if (ret) {
+ vfio_del_group_dev(dev);
+ goto free_vfio_device;
+ }
+ } else {
+ struct fsl_mc_device *mc_bus_dev;
+
+ /* Non-dprc devices share mc_io from the parent dprc */
+ mc_bus_dev = to_fsl_mc_device(mc_dev->dev.parent);
+ if (mc_bus_dev == NULL) {
+ vfio_del_group_dev(dev);
+ goto free_vfio_device;
+ }
+
+ mc_dev->mc_io = mc_bus_dev->mc_io;
+
+ /* Inherit parent MSI domain */
+ dev_set_msi_domain(&mc_dev->dev,
+ dev_get_msi_domain(mc_dev->dev.parent));
+ }
+ return 0;
+
+free_vfio_device:
+ kfree(vdev);
+ 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;
+
+ if (strcmp(mc_dev->obj_desc.type, "dprc") == 0)
+ vfio_fsl_mc_cleanup_dprc(vdev);
+ else
+ dev_set_msi_domain(&mc_dev->dev, NULL);
+
+ mc_dev->mc_io = NULL;
+
+ vfio_iommu_group_put(mc_dev->dev.iommu_group, dev);
+ kfree(vdev);
+
+ return 0;
+}
+
+/*
+ * vfio-fsl_mc is a meta-driver, so use driver_override interface to
+ * bind a fsl_mc container with this driver and match_id_table is NULL.
+ */
+static struct fsl_mc_driver vfio_fsl_mc_driver = {
+ .probe = vfio_fsl_mc_probe,
+ .remove = vfio_fsl_mc_remove,
+ .match_id_table = NULL,
+ .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_VERSION(DRIVER_VERSION);
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
--- /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 "linux/fsl/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;
+}
--- /dev/null
+++ b/drivers/vfio/fsl-mc/vfio_fsl_mc_private.h
@@ -0,0 +1,55 @@
+/*
+ * Freescale Management Complex VFIO private declarations
+ *
+ * Copyright (C) 2013-2016 Freescale Semiconductor, Inc.
+ * Copyright 2016 NXP
+ * 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.
+ */
+
+#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_region {
+ u32 flags;
+#define VFIO_FSL_MC_REGION_TYPE_MMIO 1
+#define VFIO_FSL_MC_REGION_TYPE_CACHEABLE 2
+ u32 type;
+ u64 addr;
+ resource_size_t size;
+ void __iomem *ioaddr;
+};
+
+struct vfio_fsl_mc_device {
+ struct fsl_mc_device *mc_dev;
+ int refcnt;
+ u32 num_regions;
+ struct vfio_fsl_mc_region *regions;
+ struct vfio_fsl_mc_irq *mc_irqs;
+};
+
+int vfio_fsl_mc_irqs_init(struct vfio_fsl_mc_device *vdev);
+void vfio_fsl_mc_irqs_cleanup(struct vfio_fsl_mc_device *vdev);
+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);
+#endif /* VFIO_PCI_PRIVATE_H */
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h
@@ -200,6 +200,7 @@ struct vfio_device_info {
#define VFIO_DEVICE_FLAGS_PLATFORM (1 << 2) /* vfio-platform device */
#define VFIO_DEVICE_FLAGS_AMBA (1 << 3) /* vfio-amba device */
#define VFIO_DEVICE_FLAGS_CCW (1 << 4) /* vfio-ccw device */
+#define VFIO_DEVICE_FLAGS_FSL_MC (1 << 5) /* vfio-fsl-mc device */
__u32 num_regions; /* Max region index + 1 */
__u32 num_irqs; /* Max IRQ index + 1 */
};