> -----Original Message-----
> From: liulongfang <liulongfang@xxxxxxxxxx>
> Sent: Tuesday, November 5, 2024 3:53 AM
> To: alex.williamson@xxxxxxxxxx; jgg@xxxxxxxxxx; Shameerali Kolothum
> Thodi <shameerali.kolothum.thodi@xxxxxxxxxx>; Jonathan Cameron
> <jonathan.cameron@xxxxxxxxxx>
> Cc: kvm@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
> linuxarm@xxxxxxxxxxxxx; liulongfang <liulongfang@xxxxxxxxxx>
> Subject: [PATCH v12 3/4] hisi_acc_vfio_pci: register debugfs for hisilicon
> migration driver
Hi,
Few minor comments below. Please don't re-spin just for these yet.
Please wait for others to review as well.
Thanks,
Shameer
> diff --git a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
> b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
> index a8c53952d82e..7728c9745b9d 100644
> --- a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
> +++ b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
> @@ -627,15 +627,30 @@ static void hisi_acc_vf_disable_fd(struct
> hisi_acc_vf_migration_file *migf)
> mutex_unlock(&migf->lock);
> }
>
> +static void hisi_acc_debug_migf_copy(struct hisi_acc_vf_core_device
> *hisi_acc_vdev,
> + struct hisi_acc_vf_migration_file *src_migf)
Alignment should match open parenthesis here.
> +{
> + struct hisi_acc_vf_migration_file *dst_migf = hisi_acc_vdev-
> >debug_migf;
> +
> + if (!dst_migf)
> + return;
> +
> + dst_migf->total_length = src_migf->total_length;
> + memcpy(&dst_migf->vf_data, &src_migf->vf_data,
> + sizeof(struct acc_vf_data));
Here too, alignment not correct. It is better to run,
./scripts/checkpatch --strict on these patches if you haven't done already.
> +}
> +
> static void hisi_acc_vf_disable_fds(struct hisi_acc_vf_core_device
> *hisi_acc_vdev)
> {
> if (hisi_acc_vdev->resuming_migf) {
> + hisi_acc_debug_migf_copy(hisi_acc_vdev, hisi_acc_vdev-
> >resuming_migf);
> hisi_acc_vf_disable_fd(hisi_acc_vdev->resuming_migf);
> fput(hisi_acc_vdev->resuming_migf->filp);
> hisi_acc_vdev->resuming_migf = NULL;
> }
>
> if (hisi_acc_vdev->saving_migf) {
> + hisi_acc_debug_migf_copy(hisi_acc_vdev, hisi_acc_vdev-
> >saving_migf);
> hisi_acc_vf_disable_fd(hisi_acc_vdev->saving_migf);
> fput(hisi_acc_vdev->saving_migf->filp);
> hisi_acc_vdev->saving_migf = NULL;
> @@ -1294,6 +1309,129 @@ static long hisi_acc_vfio_pci_ioctl(struct
> vfio_device *core_vdev, unsigned int
> return vfio_pci_core_ioctl(core_vdev, cmd, arg);
> }
>
> +static int hisi_acc_vf_debug_check(struct seq_file *seq, struct vfio_device
> *vdev)
> +{
> + struct hisi_acc_vf_core_device *hisi_acc_vdev =
> hisi_acc_get_vf_dev(vdev);
> + struct hisi_qm *vf_qm = &hisi_acc_vdev->vf_qm;
> + int ret;
> +
> + lockdep_assert_held(&hisi_acc_vdev->open_mutex);
> + /*
> + * When the device is not opened, the io_base is not mapped.
> + * The driver cannot perform device read and write operations.
> + */
> + if (!hisi_acc_vdev->dev_opened) {
> + seq_printf(seq, "device not opened!\n");
> + return -EINVAL;
> + }
> +
> + ret = qm_wait_dev_not_ready(vf_qm);
> + if (ret) {
> + seq_printf(seq, "VF device not ready!\n");
> + return -EBUSY;
> + }
> +
> + return 0;
> +}
> +
> +static int hisi_acc_vf_debug_cmd(struct seq_file *seq, void *data)
> +{
> + struct device *vf_dev = seq->private;
> + struct vfio_pci_core_device *core_device =
> dev_get_drvdata(vf_dev);
> + struct vfio_device *vdev = &core_device->vdev;
> + struct hisi_acc_vf_core_device *hisi_acc_vdev =
> hisi_acc_get_vf_dev(vdev);
> + struct hisi_qm *vf_qm = &hisi_acc_vdev->vf_qm;
> + u64 value;
> + int ret;
> +
> + mutex_lock(&hisi_acc_vdev->open_mutex);
> + ret = hisi_acc_vf_debug_check(seq, vdev);
> + if (ret) {
> + mutex_unlock(&hisi_acc_vdev->open_mutex);
> + return ret;
> + }
> +
> + value = readl(vf_qm->io_base + QM_MB_CMD_SEND_BASE);
> + if (value == QM_MB_CMD_NOT_READY) {
> + mutex_unlock(&hisi_acc_vdev->open_mutex);
> + seq_printf(seq, "mailbox cmd channel not ready!\n");
> + return -EINVAL;
> + }
> + mutex_unlock(&hisi_acc_vdev->open_mutex);
> + seq_printf(seq, "mailbox cmd channel ready!\n");
> +
> + return 0;
> +}
> +
> +static int hisi_acc_vf_dev_read(struct seq_file *seq, void *data)
> +{
> + struct device *vf_dev = seq->private;
> + struct vfio_pci_core_device *core_device =
> dev_get_drvdata(vf_dev);
> + struct vfio_device *vdev = &core_device->vdev;
> + struct hisi_acc_vf_core_device *hisi_acc_vdev =
> hisi_acc_get_vf_dev(vdev);
> + size_t vf_data_sz = offsetofend(struct acc_vf_data, padding);
> + struct acc_vf_data *vf_data;
> + int ret;
> +
> + mutex_lock(&hisi_acc_vdev->open_mutex);
> + ret = hisi_acc_vf_debug_check(seq, vdev);
> + if (ret) {
> + mutex_unlock(&hisi_acc_vdev->open_mutex);
> + return ret;
> + }
> +
> + mutex_lock(&hisi_acc_vdev->state_mutex);
> + vf_data = kzalloc(sizeof(struct acc_vf_data), GFP_KERNEL);
> + if (!vf_data) {
> + ret = -ENOMEM;
> + goto mutex_release;
> + }
> +
> + vf_data->vf_qm_state = hisi_acc_vdev->vf_qm_state;
> + ret = vf_qm_read_data(&hisi_acc_vdev->vf_qm, vf_data);
> + if (ret)
> + goto migf_err;
> +
> + seq_hex_dump(seq, "Dev Data:", DUMP_PREFIX_OFFSET, 16, 1,
> + (const void *)vf_data, vf_data_sz, false);
> +
> + seq_printf(seq,
> + "guest driver load: %u\n"
> + "data size: %lu\n",
> + hisi_acc_vdev->vf_qm_state,
> + sizeof(struct acc_vf_data));
There was a suggestion to add a comment here to describe vf_qm_state better.
May be something like,
vf_qm_state here indicates whether the Guest has loaded the driver for the ACC VF
device or not.
> +
> +migf_err:
> + kfree(vf_data);
> +mutex_release:
> + mutex_unlock(&hisi_acc_vdev->state_mutex);
> + mutex_unlock(&hisi_acc_vdev->open_mutex);
> +
> + return ret;
> +}
> +
> +static int hisi_acc_vf_migf_read(struct seq_file *seq, void *data)
> +{
> + struct device *vf_dev = seq->private;
> + struct vfio_pci_core_device *core_device =
> dev_get_drvdata(vf_dev);
> + struct vfio_device *vdev = &core_device->vdev;
> + struct hisi_acc_vf_core_device *hisi_acc_vdev =
> hisi_acc_get_vf_dev(vdev);
> + size_t vf_data_sz = offsetofend(struct acc_vf_data, padding);
> + struct hisi_acc_vf_migration_file *debug_migf = hisi_acc_vdev-
> >debug_migf;
> +
> + /* Check whether the live migration operation has been performed
> */
> + if (debug_migf->total_length < QM_MATCH_SIZE) {
> + seq_printf(seq, "device not migrated!\n");
> + return -EAGAIN;
> + }
> +
> + seq_hex_dump(seq, "Mig Data:", DUMP_PREFIX_OFFSET, 16, 1,
> + (const void *)&debug_migf->vf_data, vf_data_sz, false);
> + seq_printf(seq, "migrate data length: %lu\n", debug_migf-
> >total_length);
> +
> + return 0;
> +}
> +
> static int hisi_acc_vfio_pci_open_device(struct vfio_device *core_vdev)
> {
> struct hisi_acc_vf_core_device *hisi_acc_vdev =
> hisi_acc_get_vf_dev(core_vdev);
> @@ -1305,12 +1443,16 @@ static int hisi_acc_vfio_pci_open_device(struct
> vfio_device *core_vdev)
> return ret;
>
> if (core_vdev->mig_ops) {
> + mutex_lock(&hisi_acc_vdev->open_mutex);
> ret = hisi_acc_vf_qm_init(hisi_acc_vdev);
> if (ret) {
> + mutex_unlock(&hisi_acc_vdev->open_mutex);
> vfio_pci_core_disable(vdev);
> return ret;
> }
> hisi_acc_vdev->mig_state = VFIO_DEVICE_STATE_RUNNING;
> + hisi_acc_vdev->dev_opened = true;
> + mutex_unlock(&hisi_acc_vdev->open_mutex);
> }
>
> vfio_pci_core_finish_enable(vdev);
> @@ -1322,7 +1464,10 @@ static void hisi_acc_vfio_pci_close_device(struct
> vfio_device *core_vdev)
> struct hisi_acc_vf_core_device *hisi_acc_vdev =
> hisi_acc_get_vf_dev(core_vdev);
> struct hisi_qm *vf_qm = &hisi_acc_vdev->vf_qm;
>
> + mutex_lock(&hisi_acc_vdev->open_mutex);
> + hisi_acc_vdev->dev_opened = false;
> iounmap(vf_qm->io_base);
> + mutex_unlock(&hisi_acc_vdev->open_mutex);
> vfio_pci_core_close_device(core_vdev);
> }
>
> @@ -1342,6 +1487,7 @@ static int hisi_acc_vfio_pci_migrn_init_dev(struct
> vfio_device *core_vdev)
> hisi_acc_vdev->pf_qm = pf_qm;
> hisi_acc_vdev->vf_dev = pdev;
> mutex_init(&hisi_acc_vdev->state_mutex);
> + mutex_init(&hisi_acc_vdev->open_mutex);
>
> core_vdev->migration_flags = VFIO_MIGRATION_STOP_COPY |
> VFIO_MIGRATION_PRE_COPY;
> core_vdev->mig_ops = &hisi_acc_vfio_pci_migrn_state_ops;
> @@ -1387,6 +1533,48 @@ static const struct vfio_device_ops
> hisi_acc_vfio_pci_ops = {
> .detach_ioas = vfio_iommufd_physical_detach_ioas,
> };
>
> +static void hisi_acc_vfio_debug_init(struct hisi_acc_vf_core_device
> *hisi_acc_vdev)
> +{
> + struct vfio_device *vdev = &hisi_acc_vdev->core_device.vdev;
> + struct dentry *vfio_dev_migration = NULL;
> + struct dentry *vfio_hisi_acc = NULL;
> + struct device *dev = vdev->dev;
> + void *migf = NULL;
> +
> + if (!debugfs_initialized() ||
> + !IS_ENABLED(CONFIG_VFIO_DEBUGFS))
> + return;
> +
> + if (vdev->ops != &hisi_acc_vfio_pci_migrn_ops)
> + return;
> +
> + vfio_dev_migration = debugfs_lookup("migration", vdev-
> >debug_root);
> + if (!vfio_dev_migration) {
> + dev_err(dev, "failed to lookup migration debugfs file!\n");
> + return;
> + }
> +
> + migf = kzalloc(sizeof(struct hisi_acc_vf_migration_file),
> GFP_KERNEL);
> + if (!migf)
> + return;
> + hisi_acc_vdev->debug_migf = migf;
> +
> + vfio_hisi_acc = debugfs_create_dir("hisi_acc", vfio_dev_migration);
> + debugfs_create_devm_seqfile(dev, "dev_data", vfio_hisi_acc,
> + hisi_acc_vf_dev_read);
> + debugfs_create_devm_seqfile(dev, "migf_data", vfio_hisi_acc,
> + hisi_acc_vf_migf_read);
> + debugfs_create_devm_seqfile(dev, "cmd_state", vfio_hisi_acc,
> + hisi_acc_vf_debug_cmd);
> +}
> +
> +static void hisi_acc_vf_debugfs_exit(struct hisi_acc_vf_core_device
> *hisi_acc_vdev)
> +{
> + /* If migrn_ops is not used, kfree(NULL) is valid */
The above comment is not required. Please remove.
> + kfree(hisi_acc_vdev->debug_migf);
> + hisi_acc_vdev->debug_migf = NULL;
> +}
> +
