@@ -88,7 +88,7 @@ Code Seq#(hex) Include File Comments
and kernel/power/user.c
'8' all SNP8023 advanced NIC card
<mailto:mcr@solidum.com>
-';' 64-6F linux/vfio.h
+';' 64-72 linux/vfio.h
'@' 00-0F linux/radeonfb.h conflict!
'@' 00-0F drivers/video/aty/aty128fb.c conflict!
'A' 00-1F linux/apm_bios.h conflict!
@@ -1,6 +1,12 @@
+config VFIO_IOMMU_TYPE1
+ tristate
+ depends on VFIO
+ default n
+
menuconfig VFIO
tristate "VFIO Non-Privileged userspace driver framework"
depends on IOMMU_API
+ select VFIO_IOMMU_TYPE1 if X86
help
VFIO provides a framework for secure userspace device drivers.
See Documentation/vfio.txt for more details.
@@ -1 +1,3 @@
obj-$(CONFIG_VFIO) += vfio.o
+obj-$(CONFIG_VFIO_IOMMU_TYPE1) += vfio_iommu_type1.o
+obj-$(CONFIG_VFIO_PCI) += pci/
@@ -1378,6 +1378,13 @@ static int __init vfio_init(void)
pr_info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
+ /*
+ * Attempt to load known iommu-drivers. This gives us a working
+ * environment without the user needing to explicitly load iommu
+ * drivers.
+ */
+ request_module_nowait("vfio_iommu_type1");
+
return 0;
err_groups_cdev:
new file mode 100644
@@ -0,0 +1,754 @@
+/*
+ * VFIO: IOMMU DMA mapping support for Type1 IOMMU
+ *
+ * Copyright (C) 2012 Red Hat, Inc. All rights reserved.
+ * Author: Alex Williamson <alex.williamson@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Derived from original vfio:
+ * Copyright 2010 Cisco Systems, Inc. All rights reserved.
+ * Author: Tom Lyon, pugs@cisco.com
+ *
+ * We arbitrarily define a Type1 IOMMU as one matching the below code.
+ * It could be called the x86 IOMMU as it's designed for AMD-Vi & Intel
+ * VT-d, but that makes it harder to re-use as theoretically anyone
+ * implementing a similar IOMMU could make use of this. We expect the
+ * IOMMU to support the IOMMU API and have few to no restrictions around
+ * the IOVA range that can be mapped. The Type1 IOMMU is currently
+ * optimized for relatively static mappings of a userspace process with
+ * userpsace pages pinned into memory. We also assume devices and IOMMU
+ * domains are PCI based as the IOMMU API is still centered around a
+ * device/bus interface rather than a group interface.
+ */
+
+#include <linux/compat.h>
+#include <linux/device.h>
+#include <linux/fs.h>
+#include <linux/iommu.h>
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/pci.h> /* pci_bus_type */
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/vfio.h>
+#include <linux/workqueue.h>
+
+#define DRIVER_VERSION "0.2"
+#define DRIVER_AUTHOR "Alex Williamson <alex.williamson@redhat.com>"
+#define DRIVER_DESC "Type1 IOMMU driver for VFIO"
+
+static bool allow_unsafe_interrupts;
+module_param_named(allow_unsafe_interrupts,
+ allow_unsafe_interrupts, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(allow_unsafe_interrupts,
+ "Enable VFIO IOMMU support for on platforms without interrupt remapping support.");
+
+struct vfio_iommu {
+ struct iommu_domain *domain;
+ struct mutex lock;
+ struct list_head dma_list;
+ struct list_head group_list;
+ bool cache;
+};
+
+struct vfio_dma {
+ struct list_head next;
+ dma_addr_t iova; /* Device address */
+ unsigned long vaddr; /* Process virtual addr */
+ long npage; /* Number of pages */
+ int prot; /* IOMMU_READ/WRITE */
+};
+
+struct vfio_group {
+ struct iommu_group *iommu_group;
+ struct list_head next;
+};
+
+/*
+ * This code handles mapping and unmapping of user data buffers
+ * into DMA'ble space using the IOMMU
+ */
+
+#define NPAGE_TO_SIZE(npage) ((size_t)(npage) << PAGE_SHIFT)
+
+struct vwork {
+ struct mm_struct *mm;
+ long npage;
+ struct work_struct work;
+};
+
+/* delayed decrement/increment for locked_vm */
+static void vfio_lock_acct_bg(struct work_struct *work)
+{
+ struct vwork *vwork = container_of(work, struct vwork, work);
+ struct mm_struct *mm;
+
+ mm = vwork->mm;
+ down_write(&mm->mmap_sem);
+ mm->locked_vm += vwork->npage;
+ up_write(&mm->mmap_sem);
+ mmput(mm);
+ kfree(vwork);
+}
+
+static void vfio_lock_acct(long npage)
+{
+ struct vwork *vwork;
+ struct mm_struct *mm;
+
+ if (!current->mm)
+ return; /* process exited */
+
+ if (down_write_trylock(¤t->mm->mmap_sem)) {
+ current->mm->locked_vm += npage;
+ up_write(¤t->mm->mmap_sem);
+ return;
+ }
+
+ /*
+ * Couldn't get mmap_sem lock, so must setup to update
+ * mm->locked_vm later. If locked_vm were atomic, we
+ * wouldn't need this silliness
+ */
+ vwork = kmalloc(sizeof(struct vwork), GFP_KERNEL);
+ if (!vwork)
+ return;
+ mm = get_task_mm(current);
+ if (!mm) {
+ kfree(vwork);
+ return;
+ }
+ INIT_WORK(&vwork->work, vfio_lock_acct_bg);
+ vwork->mm = mm;
+ vwork->npage = npage;
+ schedule_work(&vwork->work);
+}
+
+/*
+ * Some mappings aren't backed by a struct page, for example an mmap'd
+ * MMIO range for our own or another device. These use a different
+ * pfn conversion and shouldn't be tracked as locked pages.
+ */
+static bool is_invalid_reserved_pfn(unsigned long pfn)
+{
+ if (pfn_valid(pfn)) {
+ bool reserved;
+ struct page *tail = pfn_to_page(pfn);
+ struct page *head = compound_trans_head(tail);
+ reserved = !!(PageReserved(head));
+ if (head != tail) {
+ /*
+ * "head" is not a dangling pointer
+ * (compound_trans_head takes care of that)
+ * but the hugepage may have been split
+ * from under us (and we may not hold a
+ * reference count on the head page so it can
+ * be reused before we run PageReferenced), so
+ * we've to check PageTail before returning
+ * what we just read.
+ */
+ smp_rmb();
+ if (PageTail(tail))
+ return reserved;
+ }
+ return PageReserved(tail);
+ }
+
+ return true;
+}
+
+static int put_pfn(unsigned long pfn, int prot)
+{
+ if (!is_invalid_reserved_pfn(pfn)) {
+ struct page *page = pfn_to_page(pfn);
+ if (prot & IOMMU_WRITE)
+ SetPageDirty(page);
+ put_page(page);
+ return 1;
+ }
+ return 0;
+}
+
+/* Unmap DMA region */
+static long __vfio_dma_do_unmap(struct vfio_iommu *iommu, dma_addr_t iova,
+ long npage, int prot)
+{
+ long i, unlocked = 0;
+
+ for (i = 0; i < npage; i++, iova += PAGE_SIZE) {
+ unsigned long pfn;
+
+ pfn = iommu_iova_to_phys(iommu->domain, iova) >> PAGE_SHIFT;
+ if (pfn) {
+ iommu_unmap(iommu->domain, iova, PAGE_SIZE);
+ unlocked += put_pfn(pfn, prot);
+ }
+ }
+ return unlocked;
+}
+
+static void vfio_dma_unmap(struct vfio_iommu *iommu, dma_addr_t iova,
+ long npage, int prot)
+{
+ long unlocked;
+
+ unlocked = __vfio_dma_do_unmap(iommu, iova, npage, prot);
+ vfio_lock_acct(-unlocked);
+}
+
+static int vaddr_get_pfn(unsigned long vaddr, int prot, unsigned long *pfn)
+{
+ struct page *page[1];
+ struct vm_area_struct *vma;
+ int ret = -EFAULT;
+
+ if (get_user_pages_fast(vaddr, 1, !!(prot & IOMMU_WRITE), page) == 1) {
+ *pfn = page_to_pfn(page[0]);
+ return 0;
+ }
+
+ down_read(¤t->mm->mmap_sem);
+
+ vma = find_vma_intersection(current->mm, vaddr, vaddr + 1);
+
+ if (vma && vma->vm_flags & VM_PFNMAP) {
+ *pfn = ((vaddr - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
+ if (is_invalid_reserved_pfn(*pfn))
+ ret = 0;
+ }
+
+ up_read(¤t->mm->mmap_sem);
+
+ return ret;
+}
+
+/* Map DMA region */
+static int __vfio_dma_map(struct vfio_iommu *iommu, dma_addr_t iova,
+ unsigned long vaddr, long npage, int prot)
+{
+ dma_addr_t start = iova;
+ long i, locked = 0;
+ int ret;
+
+ /* Verify that pages are not already mapped */
+ for (i = 0; i < npage; i++, iova += PAGE_SIZE)
+ if (iommu_iova_to_phys(iommu->domain, iova))
+ return -EBUSY;
+
+ iova = start;
+
+ if (iommu->cache)
+ prot |= IOMMU_CACHE;
+
+ /*
+ * XXX We break mappings into pages and use get_user_pages_fast to
+ * pin the pages in memory. It's been suggested that mlock might
+ * provide a more efficient mechanism, but nothing prevents the
+ * user from munlocking the pages, which could then allow the user
+ * access to random host memory. We also have no guarantee from the
+ * IOMMU API that the iommu driver can unmap sub-pages of previous
+ * mappings. This means we might lose an entire range if a single
+ * page within it is unmapped. Single page mappings are inefficient,
+ * but provide the most flexibility for now.
+ */
+ for (i = 0; i < npage; i++, iova += PAGE_SIZE, vaddr += PAGE_SIZE) {
+ unsigned long pfn = 0;
+
+ ret = vaddr_get_pfn(vaddr, prot, &pfn);
+ if (ret) {
+ __vfio_dma_do_unmap(iommu, start, i, prot);
+ return ret;
+ }
+
+ /*
+ * Only add actual locked pages to accounting
+ * XXX We're effectively marking a page locked for every
+ * IOVA page even though it's possible the user could be
+ * backing multiple IOVAs with the same vaddr. This over-
+ * penalizes the user process, but we currently have no
+ * easy way to do this properly.
+ */
+ if (!is_invalid_reserved_pfn(pfn))
+ locked++;
+
+ ret = iommu_map(iommu->domain, iova,
+ (phys_addr_t)pfn << PAGE_SHIFT,
+ PAGE_SIZE, prot);
+ if (ret) {
+ /* Back out mappings on error */
+ put_pfn(pfn, prot);
+ __vfio_dma_do_unmap(iommu, start, i, prot);
+ return ret;
+ }
+ }
+ vfio_lock_acct(locked);
+ return 0;
+}
+
+static inline bool ranges_overlap(dma_addr_t start1, size_t size1,
+ dma_addr_t start2, size_t size2)
+{
+ if (start1 < start2)
+ return (start2 - start1 < size1);
+ else if (start2 < start1)
+ return (start1 - start2 < size2);
+ return (size1 > 0 && size2 > 0);
+}
+
+static struct vfio_dma *vfio_find_dma(struct vfio_iommu *iommu,
+ dma_addr_t start, size_t size)
+{
+ struct vfio_dma *dma;
+
+ list_for_each_entry(dma, &iommu->dma_list, next) {
+ if (ranges_overlap(dma->iova, NPAGE_TO_SIZE(dma->npage),
+ start, size))
+ return dma;
+ }
+ return NULL;
+}
+
+static long vfio_remove_dma_overlap(struct vfio_iommu *iommu, dma_addr_t start,
+ size_t size, struct vfio_dma *dma)
+{
+ struct vfio_dma *split;
+ long npage_lo, npage_hi;
+
+ /* Existing dma region is completely covered, unmap all */
+ if (start <= dma->iova &&
+ start + size >= dma->iova + NPAGE_TO_SIZE(dma->npage)) {
+ vfio_dma_unmap(iommu, dma->iova, dma->npage, dma->prot);
+ list_del(&dma->next);
+ npage_lo = dma->npage;
+ kfree(dma);
+ return npage_lo;
+ }
+
+ /* Overlap low address of existing range */
+ if (start <= dma->iova) {
+ size_t overlap;
+
+ overlap = start + size - dma->iova;
+ npage_lo = overlap >> PAGE_SHIFT;
+
+ vfio_dma_unmap(iommu, dma->iova, npage_lo, dma->prot);
+ dma->iova += overlap;
+ dma->vaddr += overlap;
+ dma->npage -= npage_lo;
+ return npage_lo;
+ }
+
+ /* Overlap high address of existing range */
+ if (start + size >= dma->iova + NPAGE_TO_SIZE(dma->npage)) {
+ size_t overlap;
+
+ overlap = dma->iova + NPAGE_TO_SIZE(dma->npage) - start;
+ npage_hi = overlap >> PAGE_SHIFT;
+
+ vfio_dma_unmap(iommu, start, npage_hi, dma->prot);
+ dma->npage -= npage_hi;
+ return npage_hi;
+ }
+
+ /* Split existing */
+ npage_lo = (start - dma->iova) >> PAGE_SHIFT;
+ npage_hi = dma->npage - (size >> PAGE_SHIFT) - npage_lo;
+
+ split = kzalloc(sizeof *split, GFP_KERNEL);
+ if (!split)
+ return -ENOMEM;
+
+ vfio_dma_unmap(iommu, start, size >> PAGE_SHIFT, dma->prot);
+
+ dma->npage = npage_lo;
+
+ split->npage = npage_hi;
+ split->iova = start + size;
+ split->vaddr = dma->vaddr + NPAGE_TO_SIZE(npage_lo) + size;
+ split->prot = dma->prot;
+ list_add(&split->next, &iommu->dma_list);
+ return size >> PAGE_SHIFT;
+}
+
+static int vfio_dma_do_unmap(struct vfio_iommu *iommu,
+ struct vfio_iommu_type1_dma_unmap *unmap)
+{
+ long ret = 0, npage = unmap->size >> PAGE_SHIFT;
+ struct vfio_dma *dma, *tmp;
+ uint64_t mask;
+
+ mask = ((uint64_t)1 << __ffs(iommu->domain->ops->pgsize_bitmap)) - 1;
+
+ if (unmap->iova & mask)
+ return -EINVAL;
+ if (unmap->size & mask)
+ return -EINVAL;
+
+ /* XXX We still break these down into PAGE_SIZE */
+ WARN_ON(mask & PAGE_MASK);
+
+ mutex_lock(&iommu->lock);
+
+ list_for_each_entry_safe(dma, tmp, &iommu->dma_list, next) {
+ if (ranges_overlap(dma->iova, NPAGE_TO_SIZE(dma->npage),
+ unmap->iova, unmap->size)) {
+ ret = vfio_remove_dma_overlap(iommu, unmap->iova,
+ unmap->size, dma);
+ if (ret > 0)
+ npage -= ret;
+ if (ret < 0 || npage == 0)
+ break;
+ }
+ }
+ mutex_unlock(&iommu->lock);
+ return ret > 0 ? 0 : (int)ret;
+}
+
+static int vfio_dma_do_map(struct vfio_iommu *iommu,
+ struct vfio_iommu_type1_dma_map *map)
+{
+ struct vfio_dma *dma, *pdma = NULL;
+ dma_addr_t iova = map->iova;
+ unsigned long locked, lock_limit, vaddr = map->vaddr;
+ size_t size = map->size;
+ int ret = 0, prot = 0;
+ uint64_t mask;
+ long npage;
+
+ mask = ((uint64_t)1 << __ffs(iommu->domain->ops->pgsize_bitmap)) - 1;
+
+ /* READ/WRITE from device perspective */
+ if (map->flags & VFIO_DMA_MAP_FLAG_WRITE)
+ prot |= IOMMU_WRITE;
+ if (map->flags & VFIO_DMA_MAP_FLAG_READ)
+ prot |= IOMMU_READ;
+
+ if (!prot)
+ return -EINVAL; /* No READ/WRITE? */
+
+ if (vaddr & mask)
+ return -EINVAL;
+ if (iova & mask)
+ return -EINVAL;
+ if (size & mask)
+ return -EINVAL;
+
+ /* XXX We still break these down into PAGE_SIZE */
+ WARN_ON(mask & PAGE_MASK);
+
+ /* Don't allow IOVA wrap */
+ if (iova + size && iova + size < iova)
+ return -EINVAL;
+
+ /* Don't allow virtual address wrap */
+ if (vaddr + size && vaddr + size < vaddr)
+ return -EINVAL;
+
+ npage = size >> PAGE_SHIFT;
+ if (!npage)
+ return -EINVAL;
+
+ mutex_lock(&iommu->lock);
+
+ if (vfio_find_dma(iommu, iova, size)) {
+ ret = -EBUSY;
+ goto out_lock;
+ }
+
+ /* account for locked pages */
+ locked = current->mm->locked_vm + npage;
+ lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
+ if (locked > lock_limit && !capable(CAP_IPC_LOCK)) {
+ printk(KERN_WARNING "%s: RLIMIT_MEMLOCK (%ld) exceeded\n",
+ __func__, rlimit(RLIMIT_MEMLOCK));
+ ret = -ENOMEM;
+ goto out_lock;
+ }
+
+ ret = __vfio_dma_map(iommu, iova, vaddr, npage, prot);
+ if (ret)
+ goto out_lock;
+
+ /* Check if we abut a region below - nothing below 0 */
+ if (iova) {
+ dma = vfio_find_dma(iommu, iova - 1, 1);
+ if (dma && dma->prot == prot &&
+ dma->vaddr + NPAGE_TO_SIZE(dma->npage) == vaddr) {
+
+ dma->npage += npage;
+ iova = dma->iova;
+ vaddr = dma->vaddr;
+ npage = dma->npage;
+ size = NPAGE_TO_SIZE(npage);
+
+ pdma = dma;
+ }
+ }
+
+ /* Check if we abut a region above - nothing above ~0 + 1 */
+ if (iova + size) {
+ dma = vfio_find_dma(iommu, iova + size, 1);
+ if (dma && dma->prot == prot &&
+ dma->vaddr == vaddr + size) {
+
+ dma->npage += npage;
+ dma->iova = iova;
+ dma->vaddr = vaddr;
+
+ /*
+ * If merged above and below, remove previously
+ * merged entry. New entry covers it.
+ */
+ if (pdma) {
+ list_del(&pdma->next);
+ kfree(pdma);
+ }
+ pdma = dma;
+ }
+ }
+
+ /* Isolated, new region */
+ if (!pdma) {
+ dma = kzalloc(sizeof *dma, GFP_KERNEL);
+ if (!dma) {
+ ret = -ENOMEM;
+ vfio_dma_unmap(iommu, iova, npage, prot);
+ goto out_lock;
+ }
+
+ dma->npage = npage;
+ dma->iova = iova;
+ dma->vaddr = vaddr;
+ dma->prot = prot;
+ list_add(&dma->next, &iommu->dma_list);
+ }
+
+out_lock:
+ mutex_unlock(&iommu->lock);
+ return ret;
+}
+
+static int vfio_iommu_type1_attach_group(void *iommu_data,
+ struct iommu_group *iommu_group)
+{
+ struct vfio_iommu *iommu = iommu_data;
+ struct vfio_group *group, *tmp;
+ int ret;
+
+ group = kzalloc(sizeof(*group), GFP_KERNEL);
+ if (!group)
+ return -ENOMEM;
+
+ mutex_lock(&iommu->lock);
+
+ list_for_each_entry(tmp, &iommu->group_list, next) {
+ if (tmp->iommu_group == iommu_group) {
+ mutex_unlock(&iommu->lock);
+ kfree(group);
+ return -EINVAL;
+ }
+ }
+
+ /*
+ * TODO: Domain have capabilities that might change as we add
+ * groups (see iommu->cache, currently never set). Check for
+ * them and potentially disallow groups to be attached when it
+ * would change capabilities (ugh).
+ */
+ ret = iommu_attach_group(iommu->domain, iommu_group);
+ if (ret) {
+ mutex_unlock(&iommu->lock);
+ kfree(group);
+ return ret;
+ }
+
+ group->iommu_group = iommu_group;
+ list_add(&group->next, &iommu->group_list);
+
+ mutex_unlock(&iommu->lock);
+
+ return 0;
+}
+
+static void vfio_iommu_type1_detach_group(void *iommu_data,
+ struct iommu_group *iommu_group)
+{
+ struct vfio_iommu *iommu = iommu_data;
+ struct vfio_group *group;
+
+ mutex_lock(&iommu->lock);
+
+ list_for_each_entry(group, &iommu->group_list, next) {
+ if (group->iommu_group == iommu_group) {
+ iommu_detach_group(iommu->domain, iommu_group);
+ list_del(&group->next);
+ kfree(group);
+ break;
+ }
+ }
+
+ mutex_unlock(&iommu->lock);
+}
+
+static void *vfio_iommu_type1_open(unsigned long arg)
+{
+ struct vfio_iommu *iommu;
+
+ if (arg != VFIO_TYPE1_IOMMU)
+ return ERR_PTR(-EINVAL);
+
+ iommu = kzalloc(sizeof(*iommu), GFP_KERNEL);
+ if (!iommu)
+ return ERR_PTR(-ENOMEM);
+
+ INIT_LIST_HEAD(&iommu->group_list);
+ INIT_LIST_HEAD(&iommu->dma_list);
+ mutex_init(&iommu->lock);
+
+ /*
+ * Wish we didn't have to know about bus_type here.
+ */
+ iommu->domain = iommu_domain_alloc(&pci_bus_type);
+ if (!iommu->domain) {
+ kfree(iommu);
+ return ERR_PTR(-EIO);
+ }
+
+ /*
+ * Wish we could specify required capabilities rather than create
+ * a domain, see what comes out and hope it doesn't change along
+ * the way. Fortunately we know interrupt remapping is global for
+ * our iommus.
+ */
+ if (!allow_unsafe_interrupts &&
+ !iommu_domain_has_cap(iommu->domain, IOMMU_CAP_INTR_REMAP)) {
+ printk(KERN_WARNING
+ "%s: No interrupt remapping support. Use the module param \"allow_unsafe_interrupts\" to enable VFIO IOMMU support on this platform\n",
+ __func__);
+ iommu_domain_free(iommu->domain);
+ kfree(iommu);
+ return ERR_PTR(-EPERM);
+ }
+
+ return iommu;
+}
+
+static void vfio_iommu_type1_release(void *iommu_data)
+{
+ struct vfio_iommu *iommu = iommu_data;
+ struct vfio_group *group, *group_tmp;
+ struct vfio_dma *dma, *dma_tmp;
+
+ list_for_each_entry_safe(group, group_tmp, &iommu->group_list, next) {
+ iommu_detach_group(iommu->domain, group->iommu_group);
+ list_del(&group->next);
+ kfree(group);
+ }
+
+ list_for_each_entry_safe(dma, dma_tmp, &iommu->dma_list, next) {
+ vfio_dma_unmap(iommu, dma->iova, dma->npage, dma->prot);
+ list_del(&dma->next);
+ kfree(dma);
+ }
+
+ iommu_domain_free(iommu->domain);
+ iommu->domain = NULL;
+ kfree(iommu);
+}
+
+static long vfio_iommu_type1_ioctl(void *iommu_data,
+ unsigned int cmd, unsigned long arg)
+{
+ struct vfio_iommu *iommu = iommu_data;
+ unsigned long minsz;
+
+ if (cmd == VFIO_CHECK_EXTENSION) {
+ switch (arg) {
+ case VFIO_TYPE1_IOMMU:
+ return 1;
+ default:
+ return 0;
+ }
+ } else if (cmd == VFIO_IOMMU_GET_INFO) {
+ struct vfio_iommu_type1_info info;
+
+ minsz = offsetofend(struct vfio_iommu_type1_info, iova_pgsizes);
+
+ if (copy_from_user(&info, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (info.argsz < minsz)
+ return -EINVAL;
+
+ info.flags = 0;
+
+ info.iova_pgsizes = iommu->domain->ops->pgsize_bitmap;
+
+ return copy_to_user((void __user *)arg, &info, minsz);
+
+ } else if (cmd == VFIO_IOMMU_MAP_DMA) {
+ struct vfio_iommu_type1_dma_map map;
+ uint32_t mask = VFIO_DMA_MAP_FLAG_READ |
+ VFIO_DMA_MAP_FLAG_WRITE;
+
+ minsz = offsetofend(struct vfio_iommu_type1_dma_map, size);
+
+ if (copy_from_user(&map, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (map.argsz < minsz || map.flags & ~mask)
+ return -EINVAL;
+
+ return vfio_dma_do_map(iommu, &map);
+
+ } else if (cmd == VFIO_IOMMU_UNMAP_DMA) {
+ struct vfio_iommu_type1_dma_unmap unmap;
+
+ minsz = offsetofend(struct vfio_iommu_type1_dma_unmap, size);
+
+ if (copy_from_user(&unmap, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (unmap.argsz < minsz || unmap.flags)
+ return -EINVAL;
+
+ return vfio_dma_do_unmap(iommu, &unmap);
+ }
+
+ return -ENOTTY;
+}
+
+const struct vfio_iommu_driver_ops vfio_iommu_driver_ops_type1 = {
+ .name = "vfio-iommu-type1",
+ .owner = THIS_MODULE,
+ .open = vfio_iommu_type1_open,
+ .release = vfio_iommu_type1_release,
+ .ioctl = vfio_iommu_type1_ioctl,
+ .attach_group = vfio_iommu_type1_attach_group,
+ .detach_group = vfio_iommu_type1_detach_group,
+};
+
+static int __init vfio_iommu_type1_init(void)
+{
+ if (!iommu_present(&pci_bus_type))
+ return -ENODEV;
+
+ return vfio_register_iommu_driver(&vfio_iommu_driver_ops_type1);
+}
+
+static void __exit vfio_iommu_type1_cleanup(void)
+{
+ vfio_unregister_iommu_driver(&vfio_iommu_driver_ops_type1);
+}
+
+module_init(vfio_iommu_type1_init);
+module_exit(vfio_iommu_type1_cleanup);
+
+MODULE_VERSION(DRIVER_VERSION);
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
@@ -98,7 +98,7 @@ extern void vfio_unregister_iommu_driver(
/* Extensions */
-/* None yet */
+#define VFIO_TYPE1_IOMMU 1
/*
* The IOCTL interface is designed for extensibility by embedding the
@@ -364,4 +364,56 @@ struct vfio_irq_set {
*/
#define VFIO_DEVICE_RESET _IO(VFIO_TYPE, VFIO_BASE + 11)
+/* -------- API for Type1 VFIO IOMMU -------- */
+
+/**
+ * VFIO_IOMMU_GET_INFO - _IOR(VFIO_TYPE, VFIO_BASE + 12, struct vfio_iommu_info)
+ *
+ * Retrieve information about the IOMMU object. Fills in provided
+ * struct vfio_iommu_info. Caller sets argsz.
+ *
+ * XXX Should we do these by CHECK_EXTENSION too?
+ */
+struct vfio_iommu_type1_info {
+ __u32 argsz;
+ __u32 flags;
+#define VFIO_IOMMU_INFO_PGSIZES (1 << 0) /* supported page sizes info */
+ __u64 iova_pgsizes; /* Bitmap of supported page sizes */
+};
+
+#define VFIO_IOMMU_GET_INFO _IO(VFIO_TYPE, VFIO_BASE + 12)
+
+/**
+ * VFIO_IOMMU_MAP_DMA - _IOW(VFIO_TYPE, VFIO_BASE + 13, struct vfio_dma_map)
+ *
+ * Map process virtual addresses to IO virtual addresses using the
+ * provided struct vfio_dma_map. Caller sets argsz. READ &/ WRITE required.
+ */
+struct vfio_iommu_type1_dma_map {
+ __u32 argsz;
+ __u32 flags;
+#define VFIO_DMA_MAP_FLAG_READ (1 << 0) /* readable from device */
+#define VFIO_DMA_MAP_FLAG_WRITE (1 << 1) /* writable from device */
+ __u64 vaddr; /* Process virtual address */
+ __u64 iova; /* IO virtual address */
+ __u64 size; /* Size of mapping (bytes) */
+};
+
+#define VFIO_IOMMU_MAP_DMA _IO(VFIO_TYPE, VFIO_BASE + 13)
+
+/**
+ * VFIO_IOMMU_UNMAP_DMA - _IOW(VFIO_TYPE, VFIO_BASE + 14, struct vfio_dma_unmap)
+ *
+ * Unmap IO virtual addresses using the provided struct vfio_dma_unmap.
+ * Caller sets argsz.
+ */
+struct vfio_iommu_type1_dma_unmap {
+ __u32 argsz;
+ __u32 flags;
+ __u64 iova; /* IO virtual address */
+ __u64 size; /* Size of mapping (bytes) */
+};
+
+#define VFIO_IOMMU_UNMAP_DMA _IO(VFIO_TYPE, VFIO_BASE + 14)
+
#endif /* VFIO_H */
This VFIO IOMMU backend is designed primarily for AMD-Vi and Intel VT-d hardware, but is potentially usable by anything supporting similar mapping functionality. We arbitrarily call this a Type1 backend for lack of a better name. This backend has no IOVA or host memory mapping restrictions for the user and is optimized for relatively static mappings. Mapped areas are pinned into system memory. Signed-off-by: Alex Williamson <alex.williamson@redhat.com> --- Documentation/ioctl/ioctl-number.txt | 2 drivers/vfio/Kconfig | 6 drivers/vfio/Makefile | 2 drivers/vfio/vfio.c | 7 drivers/vfio/vfio_iommu_type1.c | 754 ++++++++++++++++++++++++++++++++++ include/linux/vfio.h | 54 ++ 6 files changed, 823 insertions(+), 2 deletions(-) create mode 100644 drivers/vfio/vfio_iommu_type1.c -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html