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author | Linus Torvalds <torvalds@linux-foundation.org> | 2021-09-02 22:41:33 +0200 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-09-02 22:41:33 +0200 |
commit | 89b6b8cd92c068cd1bdf877ec7fb1392568ef35d (patch) | |
tree | 36d88a0da54c7a691581fd34f89ea0469d29ae02 /samples | |
parent | Merge tag 'for-linus-5.15-rc1-tag' of git://git.kernel.org/pub/scm/linux/kern... (diff) | |
parent | Merge branches 'v5.15/vfio/spdx-license-cleanups', 'v5.15/vfio/dma-valid-wait... (diff) | |
download | linux-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.c | 40 | ||||
-rw-r--r-- | samples/vfio-mdev/mdpy.c | 40 | ||||
-rw-r--r-- | samples/vfio-mdev/mtty.c | 40 |
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, |