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authorLinus Torvalds <torvalds@linux-foundation.org>2021-09-02 22:41:33 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2021-09-02 22:41:33 +0200
commit89b6b8cd92c068cd1bdf877ec7fb1392568ef35d (patch)
tree36d88a0da54c7a691581fd34f89ea0469d29ae02 /samples
parentMerge tag 'for-linus-5.15-rc1-tag' of git://git.kernel.org/pub/scm/linux/kern... (diff)
parentMerge branches 'v5.15/vfio/spdx-license-cleanups', 'v5.15/vfio/dma-valid-wait... (diff)
downloadlinux-89b6b8cd92c068cd1bdf877ec7fb1392568ef35d.tar.xz
linux-89b6b8cd92c068cd1bdf877ec7fb1392568ef35d.zip
Merge tag 'vfio-v5.15-rc1' of git://github.com/awilliam/linux-vfio
Pull VFIO updates from Alex Williamson: - Fix dma-valid return WAITED implementation (Anthony Yznaga) - SPDX license cleanups (Cai Huoqing) - Split vfio-pci-core from vfio-pci and enhance PCI driver matching to support future vendor provided vfio-pci variants (Yishai Hadas, Max Gurtovoy, Jason Gunthorpe) - Replace duplicated reflck with core support for managing first open, last close, and device sets (Jason Gunthorpe, Max Gurtovoy, Yishai Hadas) - Fix non-modular mdev support and don't nag about request callback support (Christoph Hellwig) - Add semaphore to protect instruction intercept handler and replace open-coded locks in vfio-ap driver (Tony Krowiak) - Convert vfio-ap to vfio_register_group_dev() API (Jason Gunthorpe) * tag 'vfio-v5.15-rc1' of git://github.com/awilliam/linux-vfio: (37 commits) vfio/pci: Introduce vfio_pci_core.ko vfio: Use kconfig if XX/endif blocks instead of repeating 'depends on' vfio: Use select for eventfd PCI / VFIO: Add 'override_only' support for VFIO PCI sub system PCI: Add 'override_only' field to struct pci_device_id vfio/pci: Move module parameters to vfio_pci.c vfio/pci: Move igd initialization to vfio_pci.c vfio/pci: Split the pci_driver code out of vfio_pci_core.c vfio/pci: Include vfio header in vfio_pci_core.h vfio/pci: Rename ops functions to fit core namings vfio/pci: Rename vfio_pci_device to vfio_pci_core_device vfio/pci: Rename vfio_pci_private.h to vfio_pci_core.h vfio/pci: Rename vfio_pci.c to vfio_pci_core.c vfio/ap_ops: Convert to use vfio_register_group_dev() s390/vfio-ap: replace open coded locks for VFIO_GROUP_NOTIFY_SET_KVM notification s390/vfio-ap: r/w lock for PQAP interception handler function pointer vfio/type1: Fix vfio_find_dma_valid return vfio-pci/zdev: Remove repeated verbose license text vfio: platform: reset: Convert to SPDX identifier vfio: Remove struct vfio_device_ops open/release ...
Diffstat (limited to 'samples')
-rw-r--r--samples/vfio-mdev/mbochs.c40
-rw-r--r--samples/vfio-mdev/mdpy.c40
-rw-r--r--samples/vfio-mdev/mtty.c40
3 files changed, 50 insertions, 70 deletions
diff --git a/samples/vfio-mdev/mbochs.c b/samples/vfio-mdev/mbochs.c
index 6c0f229db36a..c313ab4d1f4e 100644
--- a/samples/vfio-mdev/mbochs.c
+++ b/samples/vfio-mdev/mbochs.c
@@ -129,7 +129,7 @@ static dev_t mbochs_devt;
static struct class *mbochs_class;
static struct cdev mbochs_cdev;
static struct device mbochs_dev;
-static int mbochs_used_mbytes;
+static atomic_t mbochs_avail_mbytes;
static const struct vfio_device_ops mbochs_dev_ops;
struct vfio_region_info_ext {
@@ -507,18 +507,22 @@ static int mbochs_reset(struct mdev_state *mdev_state)
static int mbochs_probe(struct mdev_device *mdev)
{
+ int avail_mbytes = atomic_read(&mbochs_avail_mbytes);
const struct mbochs_type *type =
&mbochs_types[mdev_get_type_group_id(mdev)];
struct device *dev = mdev_dev(mdev);
struct mdev_state *mdev_state;
int ret = -ENOMEM;
- if (type->mbytes + mbochs_used_mbytes > max_mbytes)
- return -ENOMEM;
+ do {
+ if (avail_mbytes < type->mbytes)
+ return -ENOSPC;
+ } while (!atomic_try_cmpxchg(&mbochs_avail_mbytes, &avail_mbytes,
+ avail_mbytes - type->mbytes));
mdev_state = kzalloc(sizeof(struct mdev_state), GFP_KERNEL);
if (mdev_state == NULL)
- return -ENOMEM;
+ goto err_avail;
vfio_init_group_dev(&mdev_state->vdev, &mdev->dev, &mbochs_dev_ops);
mdev_state->vconfig = kzalloc(MBOCHS_CONFIG_SPACE_SIZE, GFP_KERNEL);
@@ -549,17 +553,18 @@ static int mbochs_probe(struct mdev_device *mdev)
mbochs_create_config_space(mdev_state);
mbochs_reset(mdev_state);
- mbochs_used_mbytes += type->mbytes;
-
ret = vfio_register_group_dev(&mdev_state->vdev);
if (ret)
goto err_mem;
dev_set_drvdata(&mdev->dev, mdev_state);
return 0;
-
err_mem:
+ vfio_uninit_group_dev(&mdev_state->vdev);
+ kfree(mdev_state->pages);
kfree(mdev_state->vconfig);
kfree(mdev_state);
+err_avail:
+ atomic_add(type->mbytes, &mbochs_avail_mbytes);
return ret;
}
@@ -567,8 +572,9 @@ static void mbochs_remove(struct mdev_device *mdev)
{
struct mdev_state *mdev_state = dev_get_drvdata(&mdev->dev);
- mbochs_used_mbytes -= mdev_state->type->mbytes;
vfio_unregister_group_dev(&mdev_state->vdev);
+ vfio_uninit_group_dev(&mdev_state->vdev);
+ atomic_add(mdev_state->type->mbytes, &mbochs_avail_mbytes);
kfree(mdev_state->pages);
kfree(mdev_state->vconfig);
kfree(mdev_state);
@@ -1272,15 +1278,7 @@ static long mbochs_ioctl(struct vfio_device *vdev, unsigned int cmd,
return -ENOTTY;
}
-static int mbochs_open(struct vfio_device *vdev)
-{
- if (!try_module_get(THIS_MODULE))
- return -ENODEV;
-
- return 0;
-}
-
-static void mbochs_close(struct vfio_device *vdev)
+static void mbochs_close_device(struct vfio_device *vdev)
{
struct mdev_state *mdev_state =
container_of(vdev, struct mdev_state, vdev);
@@ -1300,7 +1298,6 @@ static void mbochs_close(struct vfio_device *vdev)
mbochs_put_pages(mdev_state);
mutex_unlock(&mdev_state->ops_lock);
- module_put(THIS_MODULE);
}
static ssize_t
@@ -1355,7 +1352,7 @@ static ssize_t available_instances_show(struct mdev_type *mtype,
{
const struct mbochs_type *type =
&mbochs_types[mtype_get_type_group_id(mtype)];
- int count = (max_mbytes - mbochs_used_mbytes) / type->mbytes;
+ int count = atomic_read(&mbochs_avail_mbytes) / type->mbytes;
return sprintf(buf, "%d\n", count);
}
@@ -1399,8 +1396,7 @@ static struct attribute_group *mdev_type_groups[] = {
};
static const struct vfio_device_ops mbochs_dev_ops = {
- .open = mbochs_open,
- .release = mbochs_close,
+ .close_device = mbochs_close_device,
.read = mbochs_read,
.write = mbochs_write,
.ioctl = mbochs_ioctl,
@@ -1437,6 +1433,8 @@ static int __init mbochs_dev_init(void)
{
int ret = 0;
+ atomic_set(&mbochs_avail_mbytes, max_mbytes);
+
ret = alloc_chrdev_region(&mbochs_devt, 0, MINORMASK + 1, MBOCHS_NAME);
if (ret < 0) {
pr_err("Error: failed to register mbochs_dev, err: %d\n", ret);
diff --git a/samples/vfio-mdev/mdpy.c b/samples/vfio-mdev/mdpy.c
index 393c9df6f6a0..8d1a80a0722a 100644
--- a/samples/vfio-mdev/mdpy.c
+++ b/samples/vfio-mdev/mdpy.c
@@ -235,17 +235,16 @@ static int mdpy_probe(struct mdev_device *mdev)
mdev_state->vconfig = kzalloc(MDPY_CONFIG_SPACE_SIZE, GFP_KERNEL);
if (mdev_state->vconfig == NULL) {
- kfree(mdev_state);
- return -ENOMEM;
+ ret = -ENOMEM;
+ goto err_state;
}
fbsize = roundup_pow_of_two(type->width * type->height * type->bytepp);
mdev_state->memblk = vmalloc_user(fbsize);
if (!mdev_state->memblk) {
- kfree(mdev_state->vconfig);
- kfree(mdev_state);
- return -ENOMEM;
+ ret = -ENOMEM;
+ goto err_vconfig;
}
dev_info(dev, "%s: %s (%dx%d)\n", __func__, type->name, type->width,
type->height);
@@ -260,13 +259,18 @@ static int mdpy_probe(struct mdev_device *mdev)
mdpy_count++;
ret = vfio_register_group_dev(&mdev_state->vdev);
- if (ret) {
- kfree(mdev_state->vconfig);
- kfree(mdev_state);
- return ret;
- }
+ if (ret)
+ goto err_mem;
dev_set_drvdata(&mdev->dev, mdev_state);
return 0;
+err_mem:
+ vfree(mdev_state->memblk);
+err_vconfig:
+ kfree(mdev_state->vconfig);
+err_state:
+ vfio_uninit_group_dev(&mdev_state->vdev);
+ kfree(mdev_state);
+ return ret;
}
static void mdpy_remove(struct mdev_device *mdev)
@@ -278,6 +282,7 @@ static void mdpy_remove(struct mdev_device *mdev)
vfio_unregister_group_dev(&mdev_state->vdev);
vfree(mdev_state->memblk);
kfree(mdev_state->vconfig);
+ vfio_uninit_group_dev(&mdev_state->vdev);
kfree(mdev_state);
mdpy_count--;
@@ -609,19 +614,6 @@ static long mdpy_ioctl(struct vfio_device *vdev, unsigned int cmd,
return -ENOTTY;
}
-static int mdpy_open(struct vfio_device *vdev)
-{
- if (!try_module_get(THIS_MODULE))
- return -ENODEV;
-
- return 0;
-}
-
-static void mdpy_close(struct vfio_device *vdev)
-{
- module_put(THIS_MODULE);
-}
-
static ssize_t
resolution_show(struct device *dev, struct device_attribute *attr,
char *buf)
@@ -716,8 +708,6 @@ static struct attribute_group *mdev_type_groups[] = {
};
static const struct vfio_device_ops mdpy_dev_ops = {
- .open = mdpy_open,
- .release = mdpy_close,
.read = mdpy_read,
.write = mdpy_write,
.ioctl = mdpy_ioctl,
diff --git a/samples/vfio-mdev/mtty.c b/samples/vfio-mdev/mtty.c
index 8b26fecc4afe..5983cdb16e3d 100644
--- a/samples/vfio-mdev/mtty.c
+++ b/samples/vfio-mdev/mtty.c
@@ -718,8 +718,8 @@ static int mtty_probe(struct mdev_device *mdev)
mdev_state = kzalloc(sizeof(struct mdev_state), GFP_KERNEL);
if (mdev_state == NULL) {
- atomic_add(nr_ports, &mdev_avail_ports);
- return -ENOMEM;
+ ret = -ENOMEM;
+ goto err_nr_ports;
}
vfio_init_group_dev(&mdev_state->vdev, &mdev->dev, &mtty_dev_ops);
@@ -732,9 +732,8 @@ static int mtty_probe(struct mdev_device *mdev)
mdev_state->vconfig = kzalloc(MTTY_CONFIG_SPACE_SIZE, GFP_KERNEL);
if (mdev_state->vconfig == NULL) {
- kfree(mdev_state);
- atomic_add(nr_ports, &mdev_avail_ports);
- return -ENOMEM;
+ ret = -ENOMEM;
+ goto err_state;
}
mutex_init(&mdev_state->ops_lock);
@@ -743,14 +742,19 @@ static int mtty_probe(struct mdev_device *mdev)
mtty_create_config_space(mdev_state);
ret = vfio_register_group_dev(&mdev_state->vdev);
- if (ret) {
- kfree(mdev_state);
- atomic_add(nr_ports, &mdev_avail_ports);
- return ret;
- }
-
+ if (ret)
+ goto err_vconfig;
dev_set_drvdata(&mdev->dev, mdev_state);
return 0;
+
+err_vconfig:
+ kfree(mdev_state->vconfig);
+err_state:
+ vfio_uninit_group_dev(&mdev_state->vdev);
+ kfree(mdev_state);
+err_nr_ports:
+ atomic_add(nr_ports, &mdev_avail_ports);
+ return ret;
}
static void mtty_remove(struct mdev_device *mdev)
@@ -761,6 +765,7 @@ static void mtty_remove(struct mdev_device *mdev)
vfio_unregister_group_dev(&mdev_state->vdev);
kfree(mdev_state->vconfig);
+ vfio_uninit_group_dev(&mdev_state->vdev);
kfree(mdev_state);
atomic_add(nr_ports, &mdev_avail_ports);
}
@@ -1202,17 +1207,6 @@ static long mtty_ioctl(struct vfio_device *vdev, unsigned int cmd,
return -ENOTTY;
}
-static int mtty_open(struct vfio_device *vdev)
-{
- pr_info("%s\n", __func__);
- return 0;
-}
-
-static void mtty_close(struct vfio_device *mdev)
-{
- pr_info("%s\n", __func__);
-}
-
static ssize_t
sample_mtty_dev_show(struct device *dev, struct device_attribute *attr,
char *buf)
@@ -1320,8 +1314,6 @@ static struct attribute_group *mdev_type_groups[] = {
static const struct vfio_device_ops mtty_dev_ops = {
.name = "vfio-mtty",
- .open = mtty_open,
- .release = mtty_close,
.read = mtty_read,
.write = mtty_write,
.ioctl = mtty_ioctl,