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-rw-r--r--drivers/vfio/Kconfig7
-rw-r--r--drivers/vfio/Makefile1
-rw-r--r--drivers/vfio/pci/vfio_pci.c311
-rw-r--r--drivers/vfio/pci/vfio_pci_config.c30
-rw-r--r--drivers/vfio/pci/vfio_pci_intrs.c64
-rw-r--r--drivers/vfio/vfio.c200
-rw-r--r--drivers/vfio/vfio_iommu_spapr_tce.c377
-rw-r--r--drivers/vfio/vfio_iommu_type1.c855
8 files changed, 1396 insertions, 449 deletions
diff --git a/drivers/vfio/Kconfig b/drivers/vfio/Kconfig
index 7cd5dec0abd..af7b204b921 100644
--- a/drivers/vfio/Kconfig
+++ b/drivers/vfio/Kconfig
@@ -3,10 +3,17 @@ config VFIO_IOMMU_TYPE1
depends on VFIO
default n
+config VFIO_IOMMU_SPAPR_TCE
+ tristate
+ depends on VFIO && SPAPR_TCE_IOMMU
+ default n
+
menuconfig VFIO
tristate "VFIO Non-Privileged userspace driver framework"
depends on IOMMU_API
select VFIO_IOMMU_TYPE1 if X86
+ select VFIO_IOMMU_SPAPR_TCE if (PPC_POWERNV || PPC_PSERIES)
+ select ANON_INODES
help
VFIO provides a framework for secure userspace device drivers.
See Documentation/vfio.txt for more details.
diff --git a/drivers/vfio/Makefile b/drivers/vfio/Makefile
index 2398d4a0e38..72bfabc8629 100644
--- a/drivers/vfio/Makefile
+++ b/drivers/vfio/Makefile
@@ -1,3 +1,4 @@
obj-$(CONFIG_VFIO) += vfio.o
obj-$(CONFIG_VFIO_IOMMU_TYPE1) += vfio_iommu_type1.o
+obj-$(CONFIG_VFIO_IOMMU_SPAPR_TCE) += vfio_iommu_spapr_tce.o
obj-$(CONFIG_VFIO_PCI) += pci/
diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
index ac3725440d6..010e0f8b8e4 100644
--- a/drivers/vfio/pci/vfio_pci.c
+++ b/drivers/vfio/pci/vfio_pci.c
@@ -13,6 +13,7 @@
#include <linux/device.h>
#include <linux/eventfd.h>
+#include <linux/file.h>
#include <linux/interrupt.h>
#include <linux/iommu.h>
#include <linux/module.h>
@@ -56,7 +57,8 @@ static int vfio_pci_enable(struct vfio_pci_device *vdev)
ret = vfio_config_init(vdev);
if (ret) {
- pci_load_and_free_saved_state(pdev, &vdev->pci_saved_state);
+ kfree(vdev->pci_saved_state);
+ vdev->pci_saved_state = NULL;
pci_disable_device(pdev);
return ret;
}
@@ -137,8 +139,16 @@ static void vfio_pci_disable(struct vfio_pci_device *vdev)
*/
pci_write_config_word(pdev, PCI_COMMAND, PCI_COMMAND_INTX_DISABLE);
- if (vdev->reset_works)
- __pci_reset_function(pdev);
+ /*
+ * Try to reset the device. The success of this is dependent on
+ * being able to lock the device, which is not always possible.
+ */
+ if (vdev->reset_works) {
+ int ret = pci_try_reset_function(pdev);
+ if (ret)
+ pr_warn("%s: Failed to reset device %s (%d)\n",
+ __func__, dev_name(&pdev->dev), ret);
+ }
pci_restore_state(pdev);
}
@@ -187,8 +197,7 @@ static int vfio_pci_get_irq_count(struct vfio_pci_device *vdev, int irq_type)
if (pos) {
pci_read_config_word(vdev->pdev,
pos + PCI_MSI_FLAGS, &flags);
-
- return 1 << (flags & PCI_MSI_FLAGS_QMASK);
+ return 1 << ((flags & PCI_MSI_FLAGS_QMASK) >> 1);
}
} else if (irq_type == VFIO_PCI_MSIX_IRQ_INDEX) {
u8 pos;
@@ -208,6 +217,110 @@ static int vfio_pci_get_irq_count(struct vfio_pci_device *vdev, int irq_type)
return 0;
}
+static int vfio_pci_count_devs(struct pci_dev *pdev, void *data)
+{
+ (*(int *)data)++;
+ return 0;
+}
+
+struct vfio_pci_fill_info {
+ int max;
+ int cur;
+ struct vfio_pci_dependent_device *devices;
+};
+
+static int vfio_pci_fill_devs(struct pci_dev *pdev, void *data)
+{
+ struct vfio_pci_fill_info *fill = data;
+ struct iommu_group *iommu_group;
+
+ if (fill->cur == fill->max)
+ return -EAGAIN; /* Something changed, try again */
+
+ iommu_group = iommu_group_get(&pdev->dev);
+ if (!iommu_group)
+ return -EPERM; /* Cannot reset non-isolated devices */
+
+ fill->devices[fill->cur].group_id = iommu_group_id(iommu_group);
+ fill->devices[fill->cur].segment = pci_domain_nr(pdev->bus);
+ fill->devices[fill->cur].bus = pdev->bus->number;
+ fill->devices[fill->cur].devfn = pdev->devfn;
+ fill->cur++;
+ iommu_group_put(iommu_group);
+ return 0;
+}
+
+struct vfio_pci_group_entry {
+ struct vfio_group *group;
+ int id;
+};
+
+struct vfio_pci_group_info {
+ int count;
+ struct vfio_pci_group_entry *groups;
+};
+
+static int vfio_pci_validate_devs(struct pci_dev *pdev, void *data)
+{
+ struct vfio_pci_group_info *info = data;
+ struct iommu_group *group;
+ int id, i;
+
+ group = iommu_group_get(&pdev->dev);
+ if (!group)
+ return -EPERM;
+
+ id = iommu_group_id(group);
+
+ for (i = 0; i < info->count; i++)
+ if (info->groups[i].id == id)
+ break;
+
+ iommu_group_put(group);
+
+ return (i == info->count) ? -EINVAL : 0;
+}
+
+static bool vfio_pci_dev_below_slot(struct pci_dev *pdev, struct pci_slot *slot)
+{
+ for (; pdev; pdev = pdev->bus->self)
+ if (pdev->bus == slot->bus)
+ return (pdev->slot == slot);
+ return false;
+}
+
+struct vfio_pci_walk_info {
+ int (*fn)(struct pci_dev *, void *data);
+ void *data;
+ struct pci_dev *pdev;
+ bool slot;
+ int ret;
+};
+
+static int vfio_pci_walk_wrapper(struct pci_dev *pdev, void *data)
+{
+ struct vfio_pci_walk_info *walk = data;
+
+ if (!walk->slot || vfio_pci_dev_below_slot(pdev, walk->pdev->slot))
+ walk->ret = walk->fn(pdev, walk->data);
+
+ return walk->ret;
+}
+
+static int vfio_pci_for_each_slot_or_bus(struct pci_dev *pdev,
+ int (*fn)(struct pci_dev *,
+ void *data), void *data,
+ bool slot)
+{
+ struct vfio_pci_walk_info walk = {
+ .fn = fn, .data = data, .pdev = pdev, .slot = slot, .ret = 0,
+ };
+
+ pci_walk_bus(pdev->bus, vfio_pci_walk_wrapper, &walk);
+
+ return walk.ret;
+}
+
static long vfio_pci_ioctl(void *device_data,
unsigned int cmd, unsigned long arg)
{
@@ -388,9 +501,188 @@ static long vfio_pci_ioctl(void *device_data,
return ret;
- } else if (cmd == VFIO_DEVICE_RESET)
+ } else if (cmd == VFIO_DEVICE_RESET) {
return vdev->reset_works ?
- pci_reset_function(vdev->pdev) : -EINVAL;
+ pci_try_reset_function(vdev->pdev) : -EINVAL;
+
+ } else if (cmd == VFIO_DEVICE_GET_PCI_HOT_RESET_INFO) {
+ struct vfio_pci_hot_reset_info hdr;
+ struct vfio_pci_fill_info fill = { 0 };
+ struct vfio_pci_dependent_device *devices = NULL;
+ bool slot = false;
+ int ret = 0;
+
+ minsz = offsetofend(struct vfio_pci_hot_reset_info, count);
+
+ if (copy_from_user(&hdr, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (hdr.argsz < minsz)
+ return -EINVAL;
+
+ hdr.flags = 0;
+
+ /* Can we do a slot or bus reset or neither? */
+ if (!pci_probe_reset_slot(vdev->pdev->slot))
+ slot = true;
+ else if (pci_probe_reset_bus(vdev->pdev->bus))
+ return -ENODEV;
+
+ /* How many devices are affected? */
+ ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
+ vfio_pci_count_devs,
+ &fill.max, slot);
+ if (ret)
+ return ret;
+
+ WARN_ON(!fill.max); /* Should always be at least one */
+
+ /*
+ * If there's enough space, fill it now, otherwise return
+ * -ENOSPC and the number of devices affected.
+ */
+ if (hdr.argsz < sizeof(hdr) + (fill.max * sizeof(*devices))) {
+ ret = -ENOSPC;
+ hdr.count = fill.max;
+ goto reset_info_exit;
+ }
+
+ devices = kcalloc(fill.max, sizeof(*devices), GFP_KERNEL);
+ if (!devices)
+ return -ENOMEM;
+
+ fill.devices = devices;
+
+ ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
+ vfio_pci_fill_devs,
+ &fill, slot);
+
+ /*
+ * If a device was removed between counting and filling,
+ * we may come up short of fill.max. If a device was
+ * added, we'll have a return of -EAGAIN above.
+ */
+ if (!ret)
+ hdr.count = fill.cur;
+
+reset_info_exit:
+ if (copy_to_user((void __user *)arg, &hdr, minsz))
+ ret = -EFAULT;
+
+ if (!ret) {
+ if (copy_to_user((void __user *)(arg + minsz), devices,
+ hdr.count * sizeof(*devices)))
+ ret = -EFAULT;
+ }
+
+ kfree(devices);
+ return ret;
+
+ } else if (cmd == VFIO_DEVICE_PCI_HOT_RESET) {
+ struct vfio_pci_hot_reset hdr;
+ int32_t *group_fds;
+ struct vfio_pci_group_entry *groups;
+ struct vfio_pci_group_info info;
+ bool slot = false;
+ int i, count = 0, ret = 0;
+
+ minsz = offsetofend(struct vfio_pci_hot_reset, count);
+
+ if (copy_from_user(&hdr, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (hdr.argsz < minsz || hdr.flags)
+ return -EINVAL;
+
+ /* Can we do a slot or bus reset or neither? */
+ if (!pci_probe_reset_slot(vdev->pdev->slot))
+ slot = true;
+ else if (pci_probe_reset_bus(vdev->pdev->bus))
+ return -ENODEV;
+
+ /*
+ * We can't let userspace give us an arbitrarily large
+ * buffer to copy, so verify how many we think there
+ * could be. Note groups can have multiple devices so
+ * one group per device is the max.
+ */
+ ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
+ vfio_pci_count_devs,
+ &count, slot);
+ if (ret)
+ return ret;
+
+ /* Somewhere between 1 and count is OK */
+ if (!hdr.count || hdr.count > count)
+ return -EINVAL;
+
+ group_fds = kcalloc(hdr.count, sizeof(*group_fds), GFP_KERNEL);
+ groups = kcalloc(hdr.count, sizeof(*groups), GFP_KERNEL);
+ if (!group_fds || !groups) {
+ kfree(group_fds);
+ kfree(groups);
+ return -ENOMEM;
+ }
+
+ if (copy_from_user(group_fds, (void __user *)(arg + minsz),
+ hdr.count * sizeof(*group_fds))) {
+ kfree(group_fds);
+ kfree(groups);
+ return -EFAULT;
+ }
+
+ /*
+ * For each group_fd, get the group through the vfio external
+ * user interface and store the group and iommu ID. This
+ * ensures the group is held across the reset.
+ */
+ for (i = 0; i < hdr.count; i++) {
+ struct vfio_group *group;
+ struct fd f = fdget(group_fds[i]);
+ if (!f.file) {
+ ret = -EBADF;
+ break;
+ }
+
+ group = vfio_group_get_external_user(f.file);
+ fdput(f);
+ if (IS_ERR(group)) {
+ ret = PTR_ERR(group);
+ break;
+ }
+
+ groups[i].group = group;
+ groups[i].id = vfio_external_user_iommu_id(group);
+ }
+
+ kfree(group_fds);
+
+ /* release reference to groups on error */
+ if (ret)
+ goto hot_reset_release;
+
+ info.count = hdr.count;
+ info.groups = groups;
+
+ /*
+ * Test whether all the affected devices are contained
+ * by the set of groups provided by the user.
+ */
+ ret = vfio_pci_for_each_slot_or_bus(vdev->pdev,
+ vfio_pci_validate_devs,
+ &info, slot);
+ if (!ret)
+ /* User has access, do the reset */
+ ret = slot ? pci_try_reset_slot(vdev->pdev->slot) :
+ pci_try_reset_bus(vdev->pdev->bus);
+
+hot_reset_release:
+ for (i--; i >= 0; i--)
+ vfio_group_put_external_user(groups[i].group);
+
+ kfree(groups);
+ return ret;
+ }
return -ENOTTY;
}
@@ -499,7 +791,6 @@ static int vfio_pci_mmap(void *device_data, struct vm_area_struct *vma)
}
vma->vm_private_data = vdev;
- vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
vma->vm_pgoff = (pci_resource_start(pdev, index) >> PAGE_SHIFT) + pgoff;
@@ -581,9 +872,13 @@ static pci_ers_result_t vfio_pci_aer_err_detected(struct pci_dev *pdev,
return PCI_ERS_RESULT_DISCONNECT;
}
+ mutex_lock(&vdev->igate);
+
if (vdev->err_trigger)
eventfd_signal(vdev->err_trigger, 1);
+ mutex_unlock(&vdev->igate);
+
vfio_device_put(device);
return PCI_ERS_RESULT_CAN_RECOVER;
diff --git a/drivers/vfio/pci/vfio_pci_config.c b/drivers/vfio/pci/vfio_pci_config.c
index affa34745be..e50790e91f7 100644
--- a/drivers/vfio/pci/vfio_pci_config.c
+++ b/drivers/vfio/pci/vfio_pci_config.c
@@ -975,20 +975,20 @@ static int vfio_vc_cap_len(struct vfio_pci_device *vdev, u16 pos)
int ret, evcc, phases, vc_arb;
int len = PCI_CAP_VC_BASE_SIZEOF;
- ret = pci_read_config_dword(pdev, pos + PCI_VC_PORT_REG1, &tmp);
+ ret = pci_read_config_dword(pdev, pos + PCI_VC_PORT_CAP1, &tmp);
if (ret)
return pcibios_err_to_errno(ret);
- evcc = tmp & PCI_VC_REG1_EVCC; /* extended vc count */
- ret = pci_read_config_dword(pdev, pos + PCI_VC_PORT_REG2, &tmp);
+ evcc = tmp & PCI_VC_CAP1_EVCC; /* extended vc count */
+ ret = pci_read_config_dword(pdev, pos + PCI_VC_PORT_CAP2, &tmp);
if (ret)
return pcibios_err_to_errno(ret);
- if (tmp & PCI_VC_REG2_128_PHASE)
+ if (tmp & PCI_VC_CAP2_128_PHASE)
phases = 128;
- else if (tmp & PCI_VC_REG2_64_PHASE)
+ else if (tmp & PCI_VC_CAP2_64_PHASE)
phases = 64;
- else if (tmp & PCI_VC_REG2_32_PHASE)
+ else if (tmp & PCI_VC_CAP2_32_PHASE)
phases = 32;
else
phases = 0;
@@ -1012,6 +1012,7 @@ static int vfio_vc_cap_len(struct vfio_pci_device *vdev, u16 pos)
static int vfio_cap_len(struct vfio_pci_device *vdev, u8 cap, u8 pos)
{
struct pci_dev *pdev = vdev->pdev;
+ u32 dword;
u16 word;
u8 byte;
int ret;
@@ -1025,7 +1026,9 @@ static int vfio_cap_len(struct vfio_pci_device *vdev, u8 cap, u8 pos)
return pcibios_err_to_errno(ret);
if (PCI_X_CMD_VERSION(word)) {
- vdev->extended_caps = true;
+ /* Test for extended capabilities */
+ pci_read_config_dword(pdev, PCI_CFG_SPACE_SIZE, &dword);
+ vdev->extended_caps = (dword != 0);
return PCI_CAP_PCIX_SIZEOF_V2;
} else
return PCI_CAP_PCIX_SIZEOF_V0;
@@ -1037,9 +1040,11 @@ static int vfio_cap_len(struct vfio_pci_device *vdev, u8 cap, u8 pos)
return byte;
case PCI_CAP_ID_EXP:
- /* length based on version */
- vdev->extended_caps = true;
+ /* Test for extended capabilities */
+ pci_read_config_dword(pdev, PCI_CFG_SPACE_SIZE, &dword);
+ vdev->extended_caps = (dword != 0);
+ /* length based on version */
if ((pcie_caps_reg(pdev) & PCI_EXP_FLAGS_VERS) == 1)
return PCI_CAP_EXP_ENDPOINT_SIZEOF_V1;
else
@@ -1121,8 +1126,7 @@ static int vfio_ext_cap_len(struct vfio_pci_device *vdev, u16 ecap, u16 epos)
return pcibios_err_to_errno(ret);
byte &= PCI_DPA_CAP_SUBSTATE_MASK;
- byte = round_up(byte + 1, 4);
- return PCI_DPA_BASE_SIZEOF + byte;
+ return PCI_DPA_BASE_SIZEOF + byte + 1;
case PCI_EXT_CAP_ID_TPH:
ret = pci_read_config_dword(pdev, epos + PCI_TPH_CAP, &dword);
if (ret)
@@ -1131,9 +1135,9 @@ static int vfio_ext_cap_len(struct vfio_pci_device *vdev, u16 ecap, u16 epos)
if ((dword & PCI_TPH_CAP_LOC_MASK) == PCI_TPH_LOC_CAP) {
int sts;
- sts = byte & PCI_TPH_CAP_ST_MASK;
+ sts = dword & PCI_TPH_CAP_ST_MASK;
sts >>= PCI_TPH_CAP_ST_SHIFT;
- return PCI_TPH_BASE_SIZEOF + round_up(sts * 2, 4);
+ return PCI_TPH_BASE_SIZEOF + (sts * 2) + 2;
}
return PCI_TPH_BASE_SIZEOF;
default:
diff --git a/drivers/vfio/pci/vfio_pci_intrs.c b/drivers/vfio/pci/vfio_pci_intrs.c
index 4bc704e1b7c..9dd49c9839a 100644
--- a/drivers/vfio/pci/vfio_pci_intrs.c
+++ b/drivers/vfio/pci/vfio_pci_intrs.c
@@ -130,8 +130,8 @@ static int virqfd_enable(struct vfio_pci_device *vdev,
void (*thread)(struct vfio_pci_device *, void *),
void *data, struct virqfd **pvirqfd, int fd)
{
- struct file *file = NULL;
- struct eventfd_ctx *ctx = NULL;
+ struct fd irqfd;
+ struct eventfd_ctx *ctx;
struct virqfd *virqfd;
int ret = 0;
unsigned int events;
@@ -149,16 +149,16 @@ static int virqfd_enable(struct vfio_pci_device *vdev,
INIT_WORK(&virqfd->shutdown, virqfd_shutdown);
INIT_WORK(&virqfd->inject, virqfd_inject);
- file = eventfd_fget(fd);
- if (IS_ERR(file)) {
- ret = PTR_ERR(file);
- goto fail;
+ irqfd = fdget(fd);
+ if (!irqfd.file) {
+ ret = -EBADF;
+ goto err_fd;
}
- ctx = eventfd_ctx_fileget(file);
+ ctx = eventfd_ctx_fileget(irqfd.file);
if (IS_ERR(ctx)) {
ret = PTR_ERR(ctx);
- goto fail;
+ goto err_ctx;
}
virqfd->eventfd = ctx;
@@ -174,7 +174,7 @@ static int virqfd_enable(struct vfio_pci_device *vdev,
if (*pvirqfd) {
spin_unlock_irq(&vdev->irqlock);
ret = -EBUSY;
- goto fail;
+ goto err_busy;
}
*pvirqfd = virqfd;
@@ -187,7 +187,7 @@ static int virqfd_enable(struct vfio_pci_device *vdev,
init_waitqueue_func_entry(&virqfd->wait, virqfd_wakeup);
init_poll_funcptr(&virqfd->pt, virqfd_ptable_queue_proc);
- events = file->f_op->poll(file, &virqfd->pt);
+ events = irqfd.file->f_op->poll(irqfd.file, &virqfd->pt);
/*
* Check if there was an event already pending on the eventfd
@@ -202,17 +202,14 @@ static int virqfd_enable(struct vfio_pci_device *vdev,
* Do not drop the file until the irqfd is fully initialized,
* otherwise we might race against the POLLHUP.
*/
- fput(file);
+ fdput(irqfd);
return 0;
-
-fail:
- if (ctx && !IS_ERR(ctx))
- eventfd_ctx_put(ctx);
-
- if (file && !IS_ERR(file))
- fput(file);
-
+err_busy:
+ eventfd_ctx_put(ctx);
+err_ctx:
+ fdput(irqfd);
+err_fd:
kfree(virqfd);
return ret;
@@ -485,15 +482,19 @@ static int vfio_msi_enable(struct vfio_pci_device *vdev, int nvec, bool msix)
for (i = 0; i < nvec; i++)
vdev->msix[i].entry = i;
- ret = pci_enable_msix(pdev, vdev->msix, nvec);
- if (ret) {
+ ret = pci_enable_msix_range(pdev, vdev->msix, 1, nvec);
+ if (ret < nvec) {
+ if (ret > 0)
+ pci_disable_msix(pdev);
kfree(vdev->msix);
kfree(vdev->ctx);
return ret;
}
} else {
- ret = pci_enable_msi_block(pdev, nvec);
- if (ret) {
+ ret = pci_enable_msi_range(pdev, 1, nvec);
+ if (ret < nvec) {
+ if (ret > 0)
+ pci_disable_msi(pdev);
kfree(vdev->ctx);
return ret;
}
@@ -752,54 +753,37 @@ static int vfio_pci_set_err_trigger(struct vfio_pci_device *vdev,
unsigned count, uint32_t flags, void *data)
{
int32_t fd = *(int32_t *)data;
- struct pci_dev *pdev = vdev->pdev;
if ((index != VFIO_PCI_ERR_IRQ_INDEX) ||
!(flags & VFIO_IRQ_SET_DATA_TYPE_MASK))
return -EINVAL;
- /*
- * device_lock synchronizes setting and checking of
- * err_trigger. The vfio_pci_aer_err_detected() is also
- * called with device_lock held.
- */
-
/* DATA_NONE/DATA_BOOL enables loopback testing */
-
if (flags & VFIO_IRQ_SET_DATA_NONE) {
- device_lock(&pdev->dev);
if (vdev->err_trigger)
eventfd_signal(vdev->err_trigger, 1);
- device_unlock(&pdev->dev);
return 0;
} else if (flags & VFIO_IRQ_SET_DATA_BOOL) {
uint8_t trigger = *(uint8_t *)data;
- device_lock(&pdev->dev);
if (trigger && vdev->err_trigger)
eventfd_signal(vdev->err_trigger, 1);
- device_unlock(&pdev->dev);
return 0;
}
/* Handle SET_DATA_EVENTFD */
-
if (fd == -1) {
- device_lock(&pdev->dev);
if (vdev->err_trigger)
eventfd_ctx_put(vdev->err_trigger);
vdev->err_trigger = NULL;
- device_unlock(&pdev->dev);
return 0;
} else if (fd >= 0) {
struct eventfd_ctx *efdctx;
efdctx = eventfd_ctx_fdget(fd);
if (IS_ERR(efdctx))
return PTR_ERR(efdctx);
- device_lock(&pdev->dev);
if (vdev->err_trigger)
eventfd_ctx_put(vdev->err_trigger);
vdev->err_trigger = efdctx;
- device_unlock(&pdev->dev);
return 0;
} else
return -EINVAL;
diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
index 6d78736563d..f018d8d0f97 100644
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -22,6 +22,7 @@
#include <linux/idr.h>
#include <linux/iommu.h>
#include <linux/list.h>
+#include <linux/miscdevice.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/rwsem.h>
@@ -45,9 +46,7 @@ static struct vfio {
struct idr group_idr;
struct mutex group_lock;
struct cdev group_cdev;
- struct device *dev;
- dev_t devt;
- struct cdev cdev;
+ dev_t group_devt;
wait_queue_head_t release_q;
} vfio;
@@ -76,6 +75,7 @@ struct vfio_group {
struct notifier_block nb;
struct list_head vfio_next;
struct list_head container_next;
+ atomic_t opened;
};
struct vfio_device {
@@ -141,8 +141,7 @@ EXPORT_SYMBOL_GPL(vfio_unregister_iommu_driver);
*/
static int vfio_alloc_group_minor(struct vfio_group *group)
{
- /* index 0 is used by /dev/vfio/vfio */
- return idr_alloc(&vfio.group_idr, group, 1, MINORMASK + 1, GFP_KERNEL);
+ return idr_alloc(&vfio.group_idr, group, 0, MINORMASK + 1, GFP_KERNEL);
}
static void vfio_free_group_minor(int minor)
@@ -206,6 +205,7 @@ static struct vfio_group *vfio_create_group(struct iommu_group *iommu_group)
INIT_LIST_HEAD(&group->device_list);
mutex_init(&group->device_lock);
atomic_set(&group->container_users, 0);
+ atomic_set(&group->opened, 0);
group->iommu_group = iommu_group;
group->nb.notifier_call = vfio_iommu_group_notifier;
@@ -241,7 +241,8 @@ static struct vfio_group *vfio_create_group(struct iommu_group *iommu_group)
}
}
- dev = device_create(vfio.class, NULL, MKDEV(MAJOR(vfio.devt), minor),
+ dev = device_create(vfio.class, NULL,
+ MKDEV(MAJOR(vfio.group_devt), minor),
group, "%d", iommu_group_id(iommu_group));
if (IS_ERR(dev)) {
vfio_free_group_minor(minor);
@@ -266,7 +267,7 @@ static void vfio_group_release(struct kref *kref)
WARN_ON(!list_empty(&group->device_list));
- device_destroy(vfio.class, MKDEV(MAJOR(vfio.devt), group->minor));
+ device_destroy(vfio.class, MKDEV(MAJOR(vfio.group_devt), group->minor));
list_del(&group->vfio_next);
vfio_free_group_minor(group->minor);
vfio_group_unlock_and_free(group);
@@ -348,7 +349,6 @@ struct vfio_device *vfio_group_create_device(struct vfio_group *group,
void *device_data)
{
struct vfio_device *device;
- int ret;
device = kzalloc(sizeof(*device), GFP_KERNEL);
if (!device)
@@ -359,12 +359,7 @@ struct vfio_device *vfio_group_create_device(struct vfio_group *group,
device->group = group;
device->ops = ops;
device->device_data = device_data;
-
- ret = dev_set_drvdata(dev, device);
- if (ret) {
- kfree(device);
- return ERR_PTR(ret);
- }
+ dev_set_drvdata(dev, device);
/* No need to get group_lock, caller has group reference */
vfio_group_get(group);
@@ -492,27 +487,6 @@ static int vfio_group_nb_add_dev(struct vfio_group *group, struct device *dev)
return 0;
}
-static int vfio_group_nb_del_dev(struct vfio_group *group, struct device *dev)
-{
- struct vfio_device *device;
-
- /*
- * Expect to fall out here. If a device was in use, it would
- * have been bound to a vfio sub-driver, which would have blocked
- * in .remove at vfio_del_group_dev. Sanity check that we no
- * longer track the device, so it's safe to remove.
- */
- device = vfio_group_get_device(group, dev);
- if (likely(!device))
- return 0;
-
- WARN("Device %s removed from live group %d!\n", dev_name(dev),
- iommu_group_id(group->iommu_group));
-
- vfio_device_put(device);
- return 0;
-}
-
static int vfio_group_nb_verify(struct vfio_group *group, struct device *dev)
{
/* We don't care what happens when the group isn't in use */
@@ -529,13 +503,11 @@ static int vfio_iommu_group_notifier(struct notifier_block *nb,
struct device *dev = data;
/*
- * Need to go through a group_lock lookup to get a reference or
- * we risk racing a group being removed. Leave a WARN_ON for
- * debuging, but if the group no longer exists, a spurious notify
- * is harmless.
+ * Need to go through a group_lock lookup to get a reference or we
+ * risk racing a group being removed. Ignore spurious notifies.
*/
group = vfio_group_try_get(group);
- if (WARN_ON(!group))
+ if (!group)
return NOTIFY_OK;
switch (action) {
@@ -543,7 +515,13 @@ static int vfio_iommu_group_notifier(struct notifier_block *nb,
vfio_group_nb_add_dev(group, dev);
break;
case IOMMU_GROUP_NOTIFY_DEL_DEVICE:
- vfio_group_nb_del_dev(group, dev);
+ /*
+ * Nothing to do here. If the device is in use, then the
+ * vfio sub-driver should block the remove callback until
+ * it is unused. If the device is unused or attached to a
+ * stub driver, then it should be released and we don't
+ * care that it will be going away.
+ */
break;
case IOMMU_GROUP_NOTIFY_BIND_DRIVER:
pr_debug("%s: Device %s, group %d binding to driver\n",
@@ -1124,7 +1102,7 @@ static int vfio_group_get_device_fd(struct vfio_group *group, char *buf)
* We can't use anon_inode_getfd() because we need to modify
* the f_mode flags directly to allow more than just ioctls
*/
- ret = get_unused_fd();
+ ret = get_unused_fd_flags(O_CLOEXEC);
if (ret < 0) {
device->ops->release(device->device_data);
break;
@@ -1236,12 +1214,22 @@ static long vfio_group_fops_compat_ioctl(struct file *filep,
static int vfio_group_fops_open(struct inode *inode, struct file *filep)
{
struct vfio_group *group;
+ int opened;
group = vfio_group_get_from_minor(iminor(inode));
if (!group)
return -ENODEV;
+ /* Do we need multiple instances of the group open? Seems not. */
+ opened = atomic_cmpxchg(&group->opened, 0, 1);
+ if (opened) {
+ vfio_group_put(group);
+ return -EBUSY;
+ }
+
+ /* Is something still in use from a previous open? */
if (group->container) {
+ atomic_dec(&group->opened);
vfio_group_put(group);
return -EBUSY;
}
@@ -1259,6 +1247,8 @@ static int vfio_group_fops_release(struct inode *inode, struct file *filep)
vfio_group_try_dissolve_container(group);
+ atomic_dec(&group->opened);
+
vfio_group_put(group);
return 0;
@@ -1356,16 +1346,89 @@ static const struct file_operations vfio_device_fops = {
};
/**
+ * External user API, exported by symbols to be linked dynamically.
+ *
+ * The protocol includes:
+ * 1. do normal VFIO init operation:
+ * - opening a new container;
+ * - attaching group(s) to it;
+ * - setting an IOMMU driver for a container.
+ * When IOMMU is set for a container, all groups in it are
+ * considered ready to use by an external user.
+ *
+ * 2. User space passes a group fd to an external user.
+ * The external user calls vfio_group_get_external_user()
+ * to verify that:
+ * - the group is initialized;
+ * - IOMMU is set for it.
+ * If both checks passed, vfio_group_get_external_user()
+ * increments the container user counter to prevent
+ * the VFIO group from disposal before KVM exits.
+ *
+ * 3. The external user calls vfio_external_user_iommu_id()
+ * to know an IOMMU ID.
+ *
+ * 4. When the external KVM finishes, it calls
+ * vfio_group_put_external_user() to release the VFIO group.
+ * This call decrements the container user counter.
+ */
+struct vfio_group *vfio_group_get_external_user(struct file *filep)
+{
+ struct vfio_group *group = filep->private_data;
+
+ if (filep->f_op != &vfio_group_fops)
+ return ERR_PTR(-EINVAL);
+
+ if (!atomic_inc_not_zero(&group->container_users))
+ return ERR_PTR(-EINVAL);
+
+ if (!group->container->iommu_driver ||
+ !vfio_group_viable(group)) {
+ atomic_dec(&group->container_users);
+ return ERR_PTR(-EINVAL);
+ }
+
+ vfio_group_get(group);
+
+ return group;
+}
+EXPORT_SYMBOL_GPL(vfio_group_get_external_user);
+
+void vfio_group_put_external_user(struct vfio_group *group)
+{
+ vfio_group_put(group);
+ vfio_group_try_dissolve_container(group);
+}
+EXPORT_SYMBOL_GPL(vfio_group_put_external_user);
+
+int vfio_external_user_iommu_id(struct vfio_group *group)
+{
+ return iommu_group_id(group->iommu_group);
+}
+EXPORT_SYMBOL_GPL(vfio_external_user_iommu_id);
+
+long vfio_external_check_extension(struct vfio_group *group, unsigned long arg)
+{
+ return vfio_ioctl_check_extension(group->container, arg);
+}
+EXPORT_SYMBOL_GPL(vfio_external_check_extension);
+
+/**
* Module/class support
*/
static char *vfio_devnode(struct device *dev, umode_t *mode)
{
- if (mode && (MINOR(dev->devt) == 0))
- *mode = S_IRUGO | S_IWUGO;
-
return kasprintf(GFP_KERNEL, "vfio/%s", dev_name(dev));
}
+static struct miscdevice vfio_dev = {
+ .minor = VFIO_MINOR,
+ .name = "vfio",
+ .fops = &vfio_fops,
+ .nodename = "vfio/vfio",
+ .mode = S_IRUGO | S_IWUGO,
+};
+
static int __init vfio_init(void)
{
int ret;
@@ -1377,6 +1440,13 @@ static int __init vfio_init(void)
INIT_LIST_HEAD(&vfio.iommu_drivers_list);
init_waitqueue_head(&vfio.release_q);
+ ret = misc_register(&vfio_dev);
+ if (ret) {
+ pr_err("vfio: misc device register failed\n");
+ return ret;
+ }
+
+ /* /dev/vfio/$GROUP */
vfio.class = class_create(THIS_MODULE, "vfio");
if (IS_ERR(vfio.class)) {
ret = PTR_ERR(vfio.class);
@@ -1385,27 +1455,14 @@ static int __init vfio_init(void)
vfio.class->devnode = vfio_devnode;
- ret = alloc_chrdev_region(&vfio.devt, 0, MINORMASK, "vfio");
- if (ret)
- goto err_base_chrdev;
-
- cdev_init(&vfio.cdev, &vfio_fops);
- ret = cdev_add(&vfio.cdev, vfio.devt, 1);
+ ret = alloc_chrdev_region(&vfio.group_devt, 0, MINORMASK, "vfio");
if (ret)
- goto err_base_cdev;
-
- vfio.dev = device_create(vfio.class, NULL, vfio.devt, NULL, "vfio");
- if (IS_ERR(vfio.dev)) {
- ret = PTR_ERR(vfio.dev);
- goto err_base_dev;
- }
+ goto err_alloc_chrdev;
- /* /dev/vfio/$GROUP */
cdev_init(&vfio.group_cdev, &vfio_group_fops);
- ret = cdev_add(&vfio.group_cdev,
- MKDEV(MAJOR(vfio.devt), 1), MINORMASK - 1);
+ ret = cdev_add(&vfio.group_cdev, vfio.group_devt, MINORMASK);
if (ret)
- goto err_groups_cdev;
+ goto err_cdev_add;
pr_info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
@@ -1415,19 +1472,17 @@ static int __init vfio_init(void)
* drivers.
*/
request_module_nowait("vfio_iommu_type1");
+ request_module_nowait("vfio_iommu_spapr_tce");
return 0;
-err_groups_cdev:
- device_destroy(vfio.class, vfio.devt);
-err_base_dev:
- cdev_del(&vfio.cdev);
-err_base_cdev:
- unregister_chrdev_region(vfio.devt, MINORMASK);
-err_base_chrdev:
+err_cdev_add:
+ unregister_chrdev_region(vfio.group_devt, MINORMASK);
+err_alloc_chrdev:
class_destroy(vfio.class);
vfio.class = NULL;
err_class:
+ misc_deregister(&vfio_dev);
return ret;
}
@@ -1437,11 +1492,10 @@ static void __exit vfio_cleanup(void)
idr_destroy(&vfio.group_idr);
cdev_del(&vfio.group_cdev);
- device_destroy(vfio.class, vfio.devt);
- cdev_del(&vfio.cdev);
- unregister_chrdev_region(vfio.devt, MINORMASK);
+ unregister_chrdev_region(vfio.group_devt, MINORMASK);
class_destroy(vfio.class);
vfio.class = NULL;
+ misc_deregister(&vfio_dev);
}
module_init(vfio_init);
@@ -1451,3 +1505,5 @@ MODULE_VERSION(DRIVER_VERSION);
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_ALIAS_MISCDEV(VFIO_MINOR);
+MODULE_ALIAS("devname:vfio/vfio");
diff --git a/drivers/vfio/vfio_iommu_spapr_tce.c b/drivers/vfio/vfio_iommu_spapr_tce.c
new file mode 100644
index 00000000000..a84788ba662
--- /dev/null
+++ b/drivers/vfio/vfio_iommu_spapr_tce.c
@@ -0,0 +1,377 @@
+/*
+ * VFIO: IOMMU DMA mapping support for TCE on POWER
+ *
+ * Copyright (C) 2013 IBM Corp. All rights reserved.
+ * Author: Alexey Kardashevskiy <aik@ozlabs.ru>
+ *
+ * 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_iommu_type1.c:
+ * Copyright (C) 2012 Red Hat, Inc. All rights reserved.
+ * Author: Alex Williamson <alex.williamson@redhat.com>
+ */
+
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <linux/err.h>
+#include <linux/vfio.h>
+#include <asm/iommu.h>
+#include <asm/tce.h>
+
+#define DRIVER_VERSION "0.1"
+#define DRIVER_AUTHOR "aik@ozlabs.ru"
+#define DRIVER_DESC "VFIO IOMMU SPAPR TCE"
+
+static void tce_iommu_detach_group(void *iommu_data,
+ struct iommu_group *iommu_group);
+
+/*
+ * VFIO IOMMU fd for SPAPR_TCE IOMMU implementation
+ *
+ * This code handles mapping and unmapping of user data buffers
+ * into DMA'ble space using the IOMMU
+ */
+
+/*
+ * The container descriptor supports only a single group per container.
+ * Required by the API as the container is not supplied with the IOMMU group
+ * at the moment of initialization.
+ */
+struct tce_container {
+ struct mutex lock;
+ struct iommu_table *tbl;
+ bool enabled;
+};
+
+static int tce_iommu_enable(struct tce_container *container)
+{
+ int ret = 0;
+ unsigned long locked, lock_limit, npages;
+ struct iommu_table *tbl = container->tbl;
+
+ if (!container->tbl)
+ return -ENXIO;
+
+ if (!current->mm)
+ return -ESRCH; /* process exited */
+
+ if (container->enabled)
+ return -EBUSY;
+
+ /*
+ * When userspace pages are mapped into the IOMMU, they are effectively
+ * locked memory, so, theoretically, we need to update the accounting
+ * of locked pages on each map and unmap. For powerpc, the map unmap
+ * paths can be very hot, though, and the accounting would kill
+ * performance, especially since it would be difficult to impossible
+ * to handle the accounting in real mode only.
+ *
+ * To address that, rather than precisely accounting every page, we
+ * instead account for a worst case on locked memory when the iommu is
+ * enabled and disabled. The worst case upper bound on locked memory
+ * is the size of the whole iommu window, which is usually relatively
+ * small (compared to total memory sizes) on POWER hardware.
+ *
+ * Also we don't have a nice way to fail on H_PUT_TCE due to ulimits,
+ * that would effectively kill the guest at random points, much better
+ * enforcing the limit based on the max that the guest can map.
+ */
+ down_write(&current->mm->mmap_sem);
+ npages = (tbl->it_size << IOMMU_PAGE_SHIFT_4K) >> PAGE_SHIFT;
+ locked = current->mm->locked_vm + npages;
+ lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
+ if (locked > lock_limit && !capable(CAP_IPC_LOCK)) {
+ pr_warn("RLIMIT_MEMLOCK (%ld) exceeded\n",
+ rlimit(RLIMIT_MEMLOCK));
+ ret = -ENOMEM;
+ } else {
+
+ current->mm->locked_vm += npages;
+ container->enabled = true;
+ }
+ up_write(&current->mm->mmap_sem);
+
+ return ret;
+}
+
+static void tce_iommu_disable(struct tce_container *container)
+{
+ if (!container->enabled)
+ return;
+
+ container->enabled = false;
+
+ if (!container->tbl || !current->mm)
+ return;
+
+ down_write(&current->mm->mmap_sem);
+ current->mm->locked_vm -= (container->tbl->it_size <<
+ IOMMU_PAGE_SHIFT_4K) >> PAGE_SHIFT;
+ up_write(&current->mm->mmap_sem);
+}
+
+static void *tce_iommu_open(unsigned long arg)
+{
+ struct tce_container *container;
+
+ if (arg != VFIO_SPAPR_TCE_IOMMU) {
+ pr_err("tce_vfio: Wrong IOMMU type\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ container = kzalloc(sizeof(*container), GFP_KERNEL);
+ if (!container)
+ return ERR_PTR(-ENOMEM);
+
+ mutex_init(&container->lock);
+
+ return container;
+}
+
+static void tce_iommu_release(void *iommu_data)
+{
+ struct tce_container *container = iommu_data;
+
+ WARN_ON(container->tbl && !container->tbl->it_group);
+ tce_iommu_disable(container);
+
+ if (container->tbl && container->tbl->it_group)
+ tce_iommu_detach_group(iommu_data, container->tbl->it_group);
+
+ mutex_destroy(&container->lock);
+
+ kfree(container);
+}
+
+static long tce_iommu_ioctl(void *iommu_data,
+ unsigned int cmd, unsigned long arg)
+{
+ struct tce_container *container = iommu_data;
+ unsigned long minsz;
+ long ret;
+
+ switch (cmd) {
+ case VFIO_CHECK_EXTENSION:
+ return (arg == VFIO_SPAPR_TCE_IOMMU) ? 1 : 0;
+
+ case VFIO_IOMMU_SPAPR_TCE_GET_INFO: {
+ struct vfio_iommu_spapr_tce_info info;
+ struct iommu_table *tbl = container->tbl;
+
+ if (WARN_ON(!tbl))
+ return -ENXIO;
+
+ minsz = offsetofend(struct vfio_iommu_spapr_tce_info,
+ dma32_window_size);
+
+ if (copy_from_user(&info, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (info.argsz < minsz)
+ return -EINVAL;
+
+ info.dma32_window_start = tbl->it_offset << IOMMU_PAGE_SHIFT_4K;
+ info.dma32_window_size = tbl->it_size << IOMMU_PAGE_SHIFT_4K;
+ info.flags = 0;
+
+ if (copy_to_user((void __user *)arg, &info, minsz))
+ return -EFAULT;
+
+ return 0;
+ }
+ case VFIO_IOMMU_MAP_DMA: {
+ struct vfio_iommu_type1_dma_map param;
+ struct iommu_table *tbl = container->tbl;
+ unsigned long tce, i;
+
+ if (!tbl)
+ return -ENXIO;
+
+ BUG_ON(!tbl->it_group);
+
+ minsz = offsetofend(struct vfio_iommu_type1_dma_map, size);
+
+ if (copy_from_user(&param, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (param.argsz < minsz)
+ return -EINVAL;
+
+ if (param.flags & ~(VFIO_DMA_MAP_FLAG_READ |
+ VFIO_DMA_MAP_FLAG_WRITE))
+ return -EINVAL;
+
+ if ((param.size & ~IOMMU_PAGE_MASK_4K) ||
+ (param.vaddr & ~IOMMU_PAGE_MASK_4K))
+ return -EINVAL;
+
+ /* iova is checked by the IOMMU API */
+ tce = param.vaddr;
+ if (param.flags & VFIO_DMA_MAP_FLAG_READ)
+ tce |= TCE_PCI_READ;
+ if (param.flags & VFIO_DMA_MAP_FLAG_WRITE)
+ tce |= TCE_PCI_WRITE;
+
+ ret = iommu_tce_put_param_check(tbl, param.iova, tce);
+ if (ret)
+ return ret;
+
+ for (i = 0; i < (param.size >> IOMMU_PAGE_SHIFT_4K); ++i) {
+ ret = iommu_put_tce_user_mode(tbl,
+ (param.iova >> IOMMU_PAGE_SHIFT_4K) + i,
+ tce);
+ if (ret)
+ break;
+ tce += IOMMU_PAGE_SIZE_4K;
+ }
+ if (ret)
+ iommu_clear_tces_and_put_pages(tbl,
+ param.iova >> IOMMU_PAGE_SHIFT_4K, i);
+
+ iommu_flush_tce(tbl);
+
+ return ret;
+ }
+ case VFIO_IOMMU_UNMAP_DMA: {
+ struct vfio_iommu_type1_dma_unmap param;
+ struct iommu_table *tbl = container->tbl;
+
+ if (WARN_ON(!tbl))
+ return -ENXIO;
+
+ minsz = offsetofend(struct vfio_iommu_type1_dma_unmap,
+ size);
+
+ if (copy_from_user(&param, (void __user *)arg, minsz))
+ return -EFAULT;
+
+ if (param.argsz < minsz)
+ return -EINVAL;
+
+ /* No flag is supported now */
+ if (param.flags)
+ return -EINVAL;
+
+ if (param.size & ~IOMMU_PAGE_MASK_4K)
+ return -EINVAL;
+
+ ret = iommu_tce_clear_param_check(tbl, param.iova, 0,
+ param.size >> IOMMU_PAGE_SHIFT_4K);
+ if (ret)
+ return ret;
+
+ ret = iommu_clear_tces_and_put_pages(tbl,
+ param.iova >> IOMMU_PAGE_SHIFT_4K,
+ param.size >> IOMMU_PAGE_SHIFT_4K);
+ iommu_flush_tce(tbl);
+
+ return ret;
+ }
+ case VFIO_IOMMU_ENABLE:
+ mutex_lock(&container->lock);
+ ret = tce_iommu_enable(container);
+ mutex_unlock(&container->lock);
+ return ret;
+
+
+ case VFIO_IOMMU_DISABLE:
+ mutex_lock(&container->lock);
+ tce_iommu_disable(container);
+ mutex_unlock(&container->lock);
+ return 0;
+ }
+
+ return -ENOTTY;
+}
+
+static int tce_iommu_attach_group(void *iommu_data,
+ struct iommu_group *iommu_group)
+{
+ int ret;
+ struct tce_container *container = iommu_data;
+ struct iommu_table *tbl = iommu_group_get_iommudata(iommu_group);
+
+ BUG_ON(!tbl);
+ mutex_lock(&container->lock);
+
+ /* pr_debug("tce_vfio: Attaching group #%u to iommu %p\n",
+ iommu_group_id(iommu_group), iommu_group); */
+ if (container->tbl) {
+ pr_warn("tce_vfio: Only one group per IOMMU container is allowed, existing id=%d, attaching id=%d\n",
+ iommu_group_id(container->tbl->it_group),
+ iommu_group_id(iommu_group));
+ ret = -EBUSY;
+ } else if (container->enabled) {
+ pr_err("tce_vfio: attaching group #%u to enabled container\n",
+ iommu_group_id(iommu_group));
+ ret = -EBUSY;
+ } else {
+ ret = iommu_take_ownership(tbl);
+ if (!ret)
+ container->tbl = tbl;
+ }
+
+ mutex_unlock(&container->lock);
+
+ return ret;
+}
+
+static void tce_iommu_detach_group(void *iommu_data,
+ struct iommu_group *iommu_group)
+{
+ struct tce_container *container = iommu_data;
+ struct iommu_table *tbl = iommu_group_get_iommudata(iommu_group);
+
+ BUG_ON(!tbl);
+ mutex_lock(&container->lock);
+ if (tbl != container->tbl) {
+ pr_warn("tce_vfio: detaching group #%u, expected group is #%u\n",
+ iommu_group_id(iommu_group),
+ iommu_group_id(tbl->it_group));
+ } else {
+ if (container->enabled) {
+ pr_warn("tce_vfio: detaching group #%u from enabled container, forcing disable\n",
+ iommu_group_id(tbl->it_group));
+ tce_iommu_disable(container);
+ }
+
+ /* pr_debug("tce_vfio: detaching group #%u from iommu %p\n",
+ iommu_group_id(iommu_group), iommu_group); */
+ container->tbl = NULL;
+ iommu_release_ownership(tbl);
+ }
+ mutex_unlock(&container->lock);
+}
+
+const struct vfio_iommu_driver_ops tce_iommu_driver_ops = {
+ .name = "iommu-vfio-powerpc",
+ .owner = THIS_MODULE,
+ .open = tce_iommu_open,
+ .release = tce_iommu_release,
+ .ioctl = tce_iommu_ioctl,
+ .attach_group = tce_iommu_attach_group,
+ .detach_group = tce_iommu_detach_group,
+};
+
+static int __init tce_iommu_init(void)
+{
+ return vfio_register_iommu_driver(&tce_iommu_driver_ops);
+}
+
+static void __exit tce_iommu_cleanup(void)
+{
+ vfio_unregister_iommu_driver(&tce_iommu_driver_ops);
+}
+
+module_init(tce_iommu_init);
+module_exit(tce_iommu_cleanup);
+
+MODULE_VERSION(DRIVER_VERSION);
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+
diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
index 6f3fbc48a6c..0734fbe5b65 100644
--- a/drivers/vfio/vfio_iommu_type1.c
+++ b/drivers/vfio/vfio_iommu_type1.c
@@ -30,7 +30,7 @@
#include <linux/iommu.h>
#include <linux/module.h>
#include <linux/mm.h>
-#include <linux/pci.h> /* pci_bus_type */
+#include <linux/rbtree.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
@@ -47,19 +47,31 @@ module_param_named(allow_unsafe_interrupts,
MODULE_PARM_DESC(allow_unsafe_interrupts,
"Enable VFIO IOMMU support for on platforms without interrupt remapping support.");
+static bool disable_hugepages;
+module_param_named(disable_hugepages,
+ disable_hugepages, bool, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(disable_hugepages,
+ "Disable VFIO IOMMU support for IOMMU hugepages.");
+
struct vfio_iommu {
- struct iommu_domain *domain;
+ struct list_head domain_list;
struct mutex lock;
- struct list_head dma_list;
+ struct rb_root dma_list;
+ bool v2;
+};
+
+struct vfio_domain {
+ struct iommu_domain *domain;
+ struct list_head next;
struct list_head group_list;
- bool cache;
+ int prot; /* IOMMU_CACHE */
};
struct vfio_dma {
- struct list_head next;
+ struct rb_node node;
dma_addr_t iova; /* Device address */
unsigned long vaddr; /* Process virtual addr */
- long npage; /* Number of pages */
+ size_t size; /* Map size (bytes) */
int prot; /* IOMMU_READ/WRITE */
};
@@ -73,7 +85,48 @@ struct vfio_group {
* into DMA'ble space using the IOMMU
*/
-#define NPAGE_TO_SIZE(npage) ((size_t)(npage) << PAGE_SHIFT)
+static struct vfio_dma *vfio_find_dma(struct vfio_iommu *iommu,
+ dma_addr_t start, size_t size)
+{
+ struct rb_node *node = iommu->dma_list.rb_node;
+
+ while (node) {
+ struct vfio_dma *dma = rb_entry(node, struct vfio_dma, node);
+
+ if (start + size <= dma->iova)
+ node = node->rb_left;
+ else if (start >= dma->iova + dma->size)
+ node = node->rb_right;
+ else
+ return dma;
+ }
+
+ return NULL;
+}
+
+static void vfio_link_dma(struct vfio_iommu *iommu, struct vfio_dma *new)
+{
+ struct rb_node **link = &iommu->dma_list.rb_node, *parent = NULL;
+ struct vfio_dma *dma;
+
+ while (*link) {
+ parent = *link;
+ dma = rb_entry(parent, struct vfio_dma, node);
+
+ if (new->iova + new->size <= dma->iova)
+ link = &(*link)->rb_left;
+ else
+ link = &(*link)->rb_right;
+ }
+
+ rb_link_node(&new->node, parent, link);
+ rb_insert_color(&new->node, &iommu->dma_list);
+}
+
+static void vfio_unlink_dma(struct vfio_iommu *iommu, struct vfio_dma *old)
+{
+ rb_erase(&old->node, &iommu->dma_list);
+}
struct vwork {
struct mm_struct *mm;
@@ -100,8 +153,8 @@ static void vfio_lock_acct(long npage)
struct vwork *vwork;
struct mm_struct *mm;
- if (!current->mm)
- return; /* process exited */
+ if (!current->mm || !npage)
+ return; /* process exited or nothing to do */
if (down_write_trylock(&current->mm->mmap_sem)) {
current->mm->locked_vm += npage;
@@ -138,12 +191,12 @@ 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);
+ struct page *head = compound_head(tail);
reserved = !!(PageReserved(head));
if (head != tail) {
/*
* "head" is not a dangling pointer
- * (compound_trans_head takes care of that)
+ * (compound_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
@@ -173,33 +226,6 @@ static int put_pfn(unsigned long pfn, int prot)
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];
@@ -226,200 +252,294 @@ static int vaddr_get_pfn(unsigned long vaddr, int prot, unsigned long *pfn)
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)
+/*
+ * Attempt to pin pages. We really don't want to track all the pfns and
+ * the iommu can only map chunks of consecutive pfns anyway, so get the
+ * first page and all consecutive pages with the same locking.
+ */
+static long vfio_pin_pages(unsigned long vaddr, long npage,
+ int prot, unsigned long *pfn_base)
{
- dma_addr_t start = iova;
- long i, locked = 0;
- int ret;
+ unsigned long limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
+ bool lock_cap = capable(CAP_IPC_LOCK);
+ long ret, i;
- /* 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;
+ if (!current->mm)
+ return -ENODEV;
- iova = start;
+ ret = vaddr_get_pfn(vaddr, prot, pfn_base);
+ if (ret)
+ return ret;
- if (iommu->cache)
- prot |= IOMMU_CACHE;
+ if (is_invalid_reserved_pfn(*pfn_base))
+ return 1;
- /*
- * 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) {
+ if (!lock_cap && current->mm->locked_vm + 1 > limit) {
+ put_pfn(*pfn_base, prot);
+ pr_warn("%s: RLIMIT_MEMLOCK (%ld) exceeded\n", __func__,
+ limit << PAGE_SHIFT);
+ return -ENOMEM;
+ }
+
+ if (unlikely(disable_hugepages)) {
+ vfio_lock_acct(1);
+ return 1;
+ }
+
+ /* Lock all the consecutive pages from pfn_base */
+ for (i = 1, vaddr += PAGE_SIZE; i < npage; i++, 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;
+ if (ret)
+ break;
+
+ if (pfn != *pfn_base + i || is_invalid_reserved_pfn(pfn)) {
+ put_pfn(pfn, prot);
+ break;
}
- /*
- * 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 */
+ if (!lock_cap && current->mm->locked_vm + i + 1 > limit) {
put_pfn(pfn, prot);
- __vfio_dma_do_unmap(iommu, start, i, prot);
- return ret;
+ pr_warn("%s: RLIMIT_MEMLOCK (%ld) exceeded\n",
+ __func__, limit << PAGE_SHIFT);
+ break;
}
}
- 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);
+ vfio_lock_acct(i);
+
+ return i;
}
-static struct vfio_dma *vfio_find_dma(struct vfio_iommu *iommu,
- dma_addr_t start, size_t size)
+static long vfio_unpin_pages(unsigned long pfn, long npage,
+ int prot, bool do_accounting)
{
- struct vfio_dma *dma;
+ unsigned long unlocked = 0;
+ long i;
- 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;
+ for (i = 0; i < npage; i++)
+ unlocked += put_pfn(pfn++, prot);
+
+ if (do_accounting)
+ vfio_lock_acct(-unlocked);
+
+ return unlocked;
}
-static long vfio_remove_dma_overlap(struct vfio_iommu *iommu, dma_addr_t start,
- size_t size, struct vfio_dma *dma)
+static void vfio_unmap_unpin(struct vfio_iommu *iommu, 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;
- }
+ dma_addr_t iova = dma->iova, end = dma->iova + dma->size;
+ struct vfio_domain *domain, *d;
+ long unlocked = 0;
- /* Overlap low address of existing range */
- if (start <= dma->iova) {
- size_t overlap;
+ if (!dma->size)
+ return;
+ /*
+ * We use the IOMMU to track the physical addresses, otherwise we'd
+ * need a much more complicated tracking system. Unfortunately that
+ * means we need to use one of the iommu domains to figure out the
+ * pfns to unpin. The rest need to be unmapped in advance so we have
+ * no iommu translations remaining when the pages are unpinned.
+ */
+ domain = d = list_first_entry(&iommu->domain_list,
+ struct vfio_domain, next);
- overlap = start + size - dma->iova;
- npage_lo = overlap >> PAGE_SHIFT;
+ list_for_each_entry_continue(d, &iommu->domain_list, next)
+ iommu_unmap(d->domain, dma->iova, dma->size);
- vfio_dma_unmap(iommu, dma->iova, npage_lo, dma->prot);
- dma->iova += overlap;
- dma->vaddr += overlap;
- dma->npage -= npage_lo;
- return npage_lo;
- }
+ while (iova < end) {
+ size_t unmapped;
+ phys_addr_t phys;
- /* Overlap high address of existing range */
- if (start + size >= dma->iova + NPAGE_TO_SIZE(dma->npage)) {
- size_t overlap;
+ phys = iommu_iova_to_phys(domain->domain, iova);
+ if (WARN_ON(!phys)) {
+ iova += PAGE_SIZE;
+ continue;
+ }
- overlap = dma->iova + NPAGE_TO_SIZE(dma->npage) - start;
- npage_hi = overlap >> PAGE_SHIFT;
+ unmapped = iommu_unmap(domain->domain, iova, PAGE_SIZE);
+ if (WARN_ON(!unmapped))
+ break;
- vfio_dma_unmap(iommu, start, npage_hi, dma->prot);
- dma->npage -= npage_hi;
- return npage_hi;
+ unlocked += vfio_unpin_pages(phys >> PAGE_SHIFT,
+ unmapped >> PAGE_SHIFT,
+ dma->prot, false);
+ iova += unmapped;
}
- /* Split existing */
- npage_lo = (start - dma->iova) >> PAGE_SHIFT;
- npage_hi = dma->npage - (size >> PAGE_SHIFT) - npage_lo;
+ vfio_lock_acct(-unlocked);
+}
- split = kzalloc(sizeof *split, GFP_KERNEL);
- if (!split)
- return -ENOMEM;
+static void vfio_remove_dma(struct vfio_iommu *iommu, struct vfio_dma *dma)
+{
+ vfio_unmap_unpin(iommu, dma);
+ vfio_unlink_dma(iommu, dma);
+ kfree(dma);
+}
- vfio_dma_unmap(iommu, start, size >> PAGE_SHIFT, dma->prot);
+static unsigned long vfio_pgsize_bitmap(struct vfio_iommu *iommu)
+{
+ struct vfio_domain *domain;
+ unsigned long bitmap = PAGE_MASK;
- dma->npage = npage_lo;
+ mutex_lock(&iommu->lock);
+ list_for_each_entry(domain, &iommu->domain_list, next)
+ bitmap &= domain->domain->ops->pgsize_bitmap;
+ mutex_unlock(&iommu->lock);
- 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;
+ return bitmap;
}
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;
+ struct vfio_dma *dma;
+ size_t unmapped = 0;
+ int ret = 0;
- mask = ((uint64_t)1 << __ffs(iommu->domain->ops->pgsize_bitmap)) - 1;
+ mask = ((uint64_t)1 << __ffs(vfio_pgsize_bitmap(iommu))) - 1;
if (unmap->iova & mask)
return -EINVAL;
- if (unmap->size & mask)
+ if (!unmap->size || 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;
+ /*
+ * vfio-iommu-type1 (v1) - User mappings were coalesced together to
+ * avoid tracking individual mappings. This means that the granularity
+ * of the original mapping was lost and the user was allowed to attempt
+ * to unmap any range. Depending on the contiguousness of physical
+ * memory and page sizes supported by the IOMMU, arbitrary unmaps may
+ * or may not have worked. We only guaranteed unmap granularity
+ * matching the original mapping; even though it was untracked here,
+ * the original mappings are reflected in IOMMU mappings. This
+ * resulted in a couple unusual behaviors. First, if a range is not
+ * able to be unmapped, ex. a set of 4k pages that was mapped as a
+ * 2M hugepage into the IOMMU, the unmap ioctl returns success but with
+ * a zero sized unmap. Also, if an unmap request overlaps the first
+ * address of a hugepage, the IOMMU will unmap the entire hugepage.
+ * This also returns success and the returned unmap size reflects the
+ * actual size unmapped.
+ *
+ * We attempt to maintain compatibility with this "v1" interface, but
+ * we take control out of the hands of the IOMMU. Therefore, an unmap
+ * request offset from the beginning of the original mapping will
+ * return success with zero sized unmap. And an unmap request covering
+ * the first iova of mapping will unmap the entire range.
+ *
+ * The v2 version of this interface intends to be more deterministic.
+ * Unmap requests must fully cover previous mappings. Multiple
+ * mappings may still be unmaped by specifying large ranges, but there
+ * must not be any previous mappings bisected by the range. An error
+ * will be returned if these conditions are not met. The v2 interface
+ * will only return success and a size of zero if there were no
+ * mappings within the range.
+ */
+ if (iommu->v2) {
+ dma = vfio_find_dma(iommu, unmap->iova, 0);
+ if (dma && dma->iova != unmap->iova) {
+ ret = -EINVAL;
+ goto unlock;
}
+ dma = vfio_find_dma(iommu, unmap->iova + unmap->size - 1, 0);
+ if (dma && dma->iova + dma->size != unmap->iova + unmap->size) {
+ ret = -EINVAL;
+ goto unlock;
+ }
+ }
+
+ while ((dma = vfio_find_dma(iommu, unmap->iova, unmap->size))) {
+ if (!iommu->v2 && unmap->iova > dma->iova)
+ break;
+ unmapped += dma->size;
+ vfio_remove_dma(iommu, dma);
}
+
+unlock:
mutex_unlock(&iommu->lock);
- return ret > 0 ? 0 : (int)ret;
+
+ /* Report how much was unmapped */
+ unmap->size = unmapped;
+
+ return ret;
+}
+
+/*
+ * Turns out AMD IOMMU has a page table bug where it won't map large pages
+ * to a region that previously mapped smaller pages. This should be fixed
+ * soon, so this is just a temporary workaround to break mappings down into
+ * PAGE_SIZE. Better to map smaller pages than nothing.
+ */
+static int map_try_harder(struct vfio_domain *domain, dma_addr_t iova,
+ unsigned long pfn, long npage, int prot)
+{
+ long i;
+ int ret;
+
+ for (i = 0; i < npage; i++, pfn++, iova += PAGE_SIZE) {
+ ret = iommu_map(domain->domain, iova,
+ (phys_addr_t)pfn << PAGE_SHIFT,
+ PAGE_SIZE, prot | domain->prot);
+ if (ret)
+ break;
+ }
+
+ for (; i < npage && i > 0; i--, iova -= PAGE_SIZE)
+ iommu_unmap(domain->domain, iova, PAGE_SIZE);
+
+ return ret;
+}
+
+static int vfio_iommu_map(struct vfio_iommu *iommu, dma_addr_t iova,
+ unsigned long pfn, long npage, int prot)
+{
+ struct vfio_domain *d;
+ int ret;
+
+ list_for_each_entry(d, &iommu->domain_list, next) {
+ ret = iommu_map(d->domain, iova, (phys_addr_t)pfn << PAGE_SHIFT,
+ npage << PAGE_SHIFT, prot | d->prot);
+ if (ret) {
+ if (ret != -EBUSY ||
+ map_try_harder(d, iova, pfn, npage, prot))
+ goto unwind;
+ }
+ }
+
+ return 0;
+
+unwind:
+ list_for_each_entry_continue_reverse(d, &iommu->domain_list, next)
+ iommu_unmap(d->domain, iova, npage << PAGE_SHIFT);
+
+ return 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;
+ unsigned long vaddr = map->vaddr;
size_t size = map->size;
+ long npage;
int ret = 0, prot = 0;
uint64_t mask;
- long npage;
+ struct vfio_dma *dma;
+ unsigned long pfn;
- mask = ((uint64_t)1 << __ffs(iommu->domain->ops->pgsize_bitmap)) - 1;
+ /* Verify that none of our __u64 fields overflow */
+ if (map->size != size || map->vaddr != vaddr || map->iova != iova)
+ return -EINVAL;
+
+ mask = ((uint64_t)1 << __ffs(vfio_pgsize_bitmap(iommu))) - 1;
+
+ WARN_ON(mask & PAGE_MASK);
/* READ/WRITE from device perspective */
if (map->flags & VFIO_DMA_MAP_FLAG_WRITE)
@@ -427,170 +547,271 @@ static int vfio_dma_do_map(struct vfio_iommu *iommu,
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)
+ if (!prot || !size || (size | iova | vaddr) & 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)
+ /* Don't allow IOVA or virtual address wrap */
+ if (iova + size - 1 < iova || vaddr + size - 1 < vaddr)
return -EINVAL;
mutex_lock(&iommu->lock);
if (vfio_find_dma(iommu, iova, size)) {
- ret = -EBUSY;
- goto out_lock;
+ mutex_unlock(&iommu->lock);
+ return -EEXIST;
}
- /* 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)) {
- pr_warn("%s: RLIMIT_MEMLOCK (%ld) exceeded\n",
- __func__, rlimit(RLIMIT_MEMLOCK));
- ret = -ENOMEM;
- goto out_lock;
+ dma = kzalloc(sizeof(*dma), GFP_KERNEL);
+ if (!dma) {
+ mutex_unlock(&iommu->lock);
+ return -ENOMEM;
}
- ret = __vfio_dma_map(iommu, iova, vaddr, npage, prot);
- if (ret)
- goto out_lock;
+ dma->iova = iova;
+ dma->vaddr = vaddr;
+ dma->prot = prot;
- /* 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) {
+ /* Insert zero-sized and grow as we map chunks of it */
+ vfio_link_dma(iommu, dma);
- dma->npage += npage;
- iova = dma->iova;
- vaddr = dma->vaddr;
- npage = dma->npage;
- size = NPAGE_TO_SIZE(npage);
+ while (size) {
+ /* Pin a contiguous chunk of memory */
+ npage = vfio_pin_pages(vaddr + dma->size,
+ size >> PAGE_SHIFT, prot, &pfn);
+ if (npage <= 0) {
+ WARN_ON(!npage);
+ ret = (int)npage;
+ break;
+ }
- pdma = dma;
+ /* Map it! */
+ ret = vfio_iommu_map(iommu, iova + dma->size, pfn, npage, prot);
+ if (ret) {
+ vfio_unpin_pages(pfn, npage, prot, true);
+ break;
}
+
+ size -= npage << PAGE_SHIFT;
+ dma->size += npage << PAGE_SHIFT;
}
- /* 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) {
+ if (ret)
+ vfio_remove_dma(iommu, dma);
+
+ mutex_unlock(&iommu->lock);
+ return ret;
+}
- dma->npage += npage;
- dma->iova = iova;
- dma->vaddr = vaddr;
+static int vfio_bus_type(struct device *dev, void *data)
+{
+ struct bus_type **bus = data;
- /*
- * If merged above and below, remove previously
- * merged entry. New entry covers it.
- */
- if (pdma) {
- list_del(&pdma->next);
- kfree(pdma);
+ if (*bus && *bus != dev->bus)
+ return -EINVAL;
+
+ *bus = dev->bus;
+
+ return 0;
+}
+
+static int vfio_iommu_replay(struct vfio_iommu *iommu,
+ struct vfio_domain *domain)
+{
+ struct vfio_domain *d;
+ struct rb_node *n;
+ int ret;
+
+ /* Arbitrarily pick the first domain in the list for lookups */
+ d = list_first_entry(&iommu->domain_list, struct vfio_domain, next);
+ n = rb_first(&iommu->dma_list);
+
+ /* If there's not a domain, there better not be any mappings */
+ if (WARN_ON(n && !d))
+ return -EINVAL;
+
+ for (; n; n = rb_next(n)) {
+ struct vfio_dma *dma;
+ dma_addr_t iova;
+
+ dma = rb_entry(n, struct vfio_dma, node);
+ iova = dma->iova;
+
+ while (iova < dma->iova + dma->size) {
+ phys_addr_t phys = iommu_iova_to_phys(d->domain, iova);
+ size_t size;
+
+ if (WARN_ON(!phys)) {
+ iova += PAGE_SIZE;
+ continue;
}
- 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;
- }
+ size = PAGE_SIZE;
+
+ while (iova + size < dma->iova + dma->size &&
+ phys + size == iommu_iova_to_phys(d->domain,
+ iova + size))
+ size += PAGE_SIZE;
- dma->npage = npage;
- dma->iova = iova;
- dma->vaddr = vaddr;
- dma->prot = prot;
- list_add(&dma->next, &iommu->dma_list);
+ ret = iommu_map(domain->domain, iova, phys,
+ size, dma->prot | domain->prot);
+ if (ret)
+ return ret;
+
+ iova += size;
+ }
}
-out_lock:
- mutex_unlock(&iommu->lock);
- return ret;
+ return 0;
}
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;
+ struct vfio_group *group, *g;
+ struct vfio_domain *domain, *d;
+ struct bus_type *bus = NULL;
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) {
+ list_for_each_entry(d, &iommu->domain_list, next) {
+ list_for_each_entry(g, &d->group_list, next) {
+ if (g->iommu_group != iommu_group)
+ continue;
+
mutex_unlock(&iommu->lock);
- kfree(group);
return -EINVAL;
}
}
+ group = kzalloc(sizeof(*group), GFP_KERNEL);
+ domain = kzalloc(sizeof(*domain), GFP_KERNEL);
+ if (!group || !domain) {
+ ret = -ENOMEM;
+ goto out_free;
+ }
+
+ group->iommu_group = iommu_group;
+
+ /* Determine bus_type in order to allocate a domain */
+ ret = iommu_group_for_each_dev(iommu_group, &bus, vfio_bus_type);
+ if (ret)
+ goto out_free;
+
+ domain->domain = iommu_domain_alloc(bus);
+ if (!domain->domain) {
+ ret = -EIO;
+ goto out_free;
+ }
+
+ ret = iommu_attach_group(domain->domain, iommu_group);
+ if (ret)
+ goto out_domain;
+
+ INIT_LIST_HEAD(&domain->group_list);
+ list_add(&group->next, &domain->group_list);
+
+ if (!allow_unsafe_interrupts &&
+ !iommu_domain_has_cap(domain->domain, IOMMU_CAP_INTR_REMAP)) {
+ pr_warn("%s: No interrupt remapping support. Use the module param \"allow_unsafe_interrupts\" to enable VFIO IOMMU support on this platform\n",
+ __func__);
+ ret = -EPERM;
+ goto out_detach;
+ }
+
+ if (iommu_domain_has_cap(domain->domain, IOMMU_CAP_CACHE_COHERENCY))
+ domain->prot |= IOMMU_CACHE;
+
/*
- * 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).
+ * Try to match an existing compatible domain. We don't want to
+ * preclude an IOMMU driver supporting multiple bus_types and being
+ * able to include different bus_types in the same IOMMU domain, so
+ * we test whether the domains use the same iommu_ops rather than
+ * testing if they're on the same bus_type.
*/
- ret = iommu_attach_group(iommu->domain, iommu_group);
- if (ret) {
- mutex_unlock(&iommu->lock);
- kfree(group);
- return ret;
+ list_for_each_entry(d, &iommu->domain_list, next) {
+ if (d->domain->ops == domain->domain->ops &&
+ d->prot == domain->prot) {
+ iommu_detach_group(domain->domain, iommu_group);
+ if (!iommu_attach_group(d->domain, iommu_group)) {
+ list_add(&group->next, &d->group_list);
+ iommu_domain_free(domain->domain);
+ kfree(domain);
+ mutex_unlock(&iommu->lock);
+ return 0;
+ }
+
+ ret = iommu_attach_group(domain->domain, iommu_group);
+ if (ret)
+ goto out_domain;
+ }
}
- group->iommu_group = iommu_group;
- list_add(&group->next, &iommu->group_list);
+ /* replay mappings on new domains */
+ ret = vfio_iommu_replay(iommu, domain);
+ if (ret)
+ goto out_detach;
+
+ list_add(&domain->next, &iommu->domain_list);
mutex_unlock(&iommu->lock);
return 0;
+
+out_detach:
+ iommu_detach_group(domain->domain, iommu_group);
+out_domain:
+ iommu_domain_free(domain->domain);
+out_free:
+ kfree(domain);
+ kfree(group);
+ mutex_unlock(&iommu->lock);
+ return ret;
+}
+
+static void vfio_iommu_unmap_unpin_all(struct vfio_iommu *iommu)
+{
+ struct rb_node *node;
+
+ while ((node = rb_first(&iommu->dma_list)))
+ vfio_remove_dma(iommu, rb_entry(node, struct vfio_dma, node));
}
static void vfio_iommu_type1_detach_group(void *iommu_data,
struct iommu_group *iommu_group)
{
struct vfio_iommu *iommu = iommu_data;
+ struct vfio_domain *domain;
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_for_each_entry(domain, &iommu->domain_list, next) {
+ list_for_each_entry(group, &domain->group_list, next) {
+ if (group->iommu_group != iommu_group)
+ continue;
+
+ iommu_detach_group(domain->domain, iommu_group);
list_del(&group->next);
kfree(group);
- break;
+ /*
+ * Group ownership provides privilege, if the group
+ * list is empty, the domain goes away. If it's the
+ * last domain, then all the mappings go away too.
+ */
+ if (list_empty(&domain->group_list)) {
+ if (list_is_singular(&iommu->domain_list))
+ vfio_iommu_unmap_unpin_all(iommu);
+ iommu_domain_free(domain->domain);
+ list_del(&domain->next);
+ kfree(domain);
+ }
+ goto done;
}
}
+done:
mutex_unlock(&iommu->lock);
}
@@ -598,40 +819,17 @@ static void *vfio_iommu_type1_open(unsigned long arg)
{
struct vfio_iommu *iommu;
- if (arg != VFIO_TYPE1_IOMMU)
+ if (arg != VFIO_TYPE1_IOMMU && arg != VFIO_TYPE1v2_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);
+ INIT_LIST_HEAD(&iommu->domain_list);
+ iommu->dma_list = RB_ROOT;
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)) {
- pr_warn("%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);
- }
+ iommu->v2 = (arg == VFIO_TYPE1v2_IOMMU);
return iommu;
}
@@ -639,26 +837,44 @@ static void *vfio_iommu_type1_open(unsigned long arg)
static void vfio_iommu_type1_release(void *iommu_data)
{
struct vfio_iommu *iommu = iommu_data;
+ struct vfio_domain *domain, *domain_tmp;
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);
- }
+ vfio_iommu_unmap_unpin_all(iommu);
- 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);
+ list_for_each_entry_safe(domain, domain_tmp,
+ &iommu->domain_list, next) {
+ list_for_each_entry_safe(group, group_tmp,
+ &domain->group_list, next) {
+ iommu_detach_group(domain->domain, group->iommu_group);
+ list_del(&group->next);
+ kfree(group);
+ }
+ iommu_domain_free(domain->domain);
+ list_del(&domain->next);
+ kfree(domain);
}
- iommu_domain_free(iommu->domain);
- iommu->domain = NULL;
kfree(iommu);
}
+static int vfio_domains_have_iommu_cache(struct vfio_iommu *iommu)
+{
+ struct vfio_domain *domain;
+ int ret = 1;
+
+ mutex_lock(&iommu->lock);
+ list_for_each_entry(domain, &iommu->domain_list, next) {
+ if (!(domain->prot & IOMMU_CACHE)) {
+ ret = 0;
+ break;
+ }
+ }
+ mutex_unlock(&iommu->lock);
+
+ return ret;
+}
+
static long vfio_iommu_type1_ioctl(void *iommu_data,
unsigned int cmd, unsigned long arg)
{
@@ -668,7 +884,12 @@ static long vfio_iommu_type1_ioctl(void *iommu_data,
if (cmd == VFIO_CHECK_EXTENSION) {
switch (arg) {
case VFIO_TYPE1_IOMMU:
+ case VFIO_TYPE1v2_IOMMU:
return 1;
+ case VFIO_DMA_CC_IOMMU:
+ if (!iommu)
+ return 0;
+ return vfio_domains_have_iommu_cache(iommu);
default:
return 0;
}
@@ -685,7 +906,7 @@ static long vfio_iommu_type1_ioctl(void *iommu_data,
info.flags = 0;
- info.iova_pgsizes = iommu->domain->ops->pgsize_bitmap;
+ info.iova_pgsizes = vfio_pgsize_bitmap(iommu);
return copy_to_user((void __user *)arg, &info, minsz);
@@ -706,6 +927,7 @@ static long vfio_iommu_type1_ioctl(void *iommu_data,
} else if (cmd == VFIO_IOMMU_UNMAP_DMA) {
struct vfio_iommu_type1_dma_unmap unmap;
+ long ret;
minsz = offsetofend(struct vfio_iommu_type1_dma_unmap, size);
@@ -715,7 +937,11 @@ static long vfio_iommu_type1_ioctl(void *iommu_data,
if (unmap.argsz < minsz || unmap.flags)
return -EINVAL;
- return vfio_dma_do_unmap(iommu, &unmap);
+ ret = vfio_dma_do_unmap(iommu, &unmap);
+ if (ret)
+ return ret;
+
+ return copy_to_user((void __user *)arg, &unmap, minsz);
}
return -ENOTTY;
@@ -733,9 +959,6 @@ static const struct vfio_iommu_driver_ops vfio_iommu_driver_ops_type1 = {
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);
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-09 19:16:56 +0000