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Date: Mon, 28 Nov 2022 11:11:58 +0800
From: Longfang Liu <liulongfang@...wei.com>
To: <alex.williamson@...hat.com>, <jgg@...dia.com>,
<shameerali.kolothum.thodi@...wei.com>, <john.garry@...wei.com>
CC: <cohuck@...hat.com>, <linux-kernel@...r.kernel.org>,
<linuxarm@...neuler.org>, <liulongfang@...wei.com>
Subject: [PATCH v3 3/5] hisi_acc_vfio_pci: register debugfs for hisilicon migration driver
On the debugfs framework of VFIO, register the debug function
for the live migration driver of the hisilicon accelerator device.
Signed-off-by: Longfang Liu <liulongfang@...wei.com>
---
.../vfio/pci/hisilicon/hisi_acc_vfio_pci.c | 168 ++++++++++++++++++
.../vfio/pci/hisilicon/hisi_acc_vfio_pci.h | 6 +
2 files changed, 174 insertions(+)
diff --git a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
index eb18edffbd5f..d683d48911d1 100644
--- a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
+++ b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
@@ -15,6 +15,7 @@
#include <linux/anon_inodes.h>
#include "hisi_acc_vfio_pci.h"
+#include "../vfio_pci_debugfs.h"
/* Return 0 on VM acc device ready, -ETIMEDOUT hardware timeout */
static int qm_wait_dev_not_ready(struct hisi_qm *qm)
@@ -609,6 +610,18 @@ hisi_acc_check_int_state(struct hisi_acc_vf_core_device *hisi_acc_vdev)
}
}
+static void hisi_acc_vf_migf_save(struct hisi_acc_vf_migration_file *src_migf,
+ struct hisi_acc_vf_migration_file *dst_migf)
+{
+ if (!dst_migf)
+ return;
+
+ dst_migf->disabled = false;
+ dst_migf->total_length = src_migf->total_length;
+ memcpy(&dst_migf->vf_data, &src_migf->vf_data,
+ sizeof(struct acc_vf_data));
+}
+
static void hisi_acc_vf_disable_fd(struct hisi_acc_vf_migration_file *migf)
{
mutex_lock(&migf->lock);
@@ -620,13 +633,19 @@ static void hisi_acc_vf_disable_fd(struct hisi_acc_vf_migration_file *migf)
static void hisi_acc_vf_disable_fds(struct hisi_acc_vf_core_device *hisi_acc_vdev)
{
+ struct vfio_device *vdev = &hisi_acc_vdev->core_device.vdev;
+
if (hisi_acc_vdev->resuming_migf) {
+ hisi_acc_vf_migf_save(hisi_acc_vdev->resuming_migf,
+ vdev->vf_migration_file);
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_vf_migf_save(hisi_acc_vdev->saving_migf,
+ vdev->vf_migration_file);
hisi_acc_vf_disable_fd(hisi_acc_vdev->saving_migf);
fput(hisi_acc_vdev->saving_migf->filp);
hisi_acc_vdev->saving_migf = NULL;
@@ -1188,6 +1207,145 @@ 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_io(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;
+ struct device *dev = vdev->dev;
+ u64 data;
+ int ret;
+
+ data = readl(vf_qm->io_base + QM_MB_CMD_SEND_BASE);
+ dev_info(dev, "debug mailbox val: 0x%llx\n", data);
+
+ ret = qm_wait_dev_not_ready(vf_qm);
+ if (ret)
+ dev_err(dev, "VF device not ready!\n");
+
+ return ret;
+}
+
+static int hisi_acc_vf_debug_resume(struct vfio_device *vdev)
+{
+ struct hisi_acc_vf_core_device *hisi_acc_vdev = hisi_acc_get_vf_dev(vdev);
+ struct hisi_acc_vf_migration_file *migf =
+ (struct hisi_acc_vf_migration_file *)vdev->vf_migration_file;
+ struct device *dev = vdev->dev;
+ int ret;
+
+ ret = vf_qm_state_save(hisi_acc_vdev, migf);
+ if (ret) {
+ dev_err(dev, "failed to save device data!\n");
+ return -EINVAL;
+ }
+
+ ret = vf_qm_check_match(hisi_acc_vdev, migf);
+ if (ret) {
+ dev_err(dev, "failed to match the VF!\n");
+ return -EINVAL;
+ }
+
+ ret = vf_qm_load_data(hisi_acc_vdev, migf);
+ if (ret) {
+ dev_err(dev, "failed to recover the VF!\n");
+ return -EINVAL;
+ }
+
+ vf_qm_fun_reset(&hisi_acc_vdev->vf_qm);
+ dev_info(dev, "successful to resume device data!\n");
+
+ return 0;
+}
+
+static int hisi_acc_vf_debug_save(struct vfio_device *vdev)
+{
+ struct hisi_acc_vf_core_device *hisi_acc_vdev = hisi_acc_get_vf_dev(vdev);
+ struct hisi_acc_vf_migration_file *migf =
+ (struct hisi_acc_vf_migration_file *)vdev->vf_migration_file;
+ struct device *dev = vdev->dev;
+ int ret;
+
+ ret = vf_qm_state_save(hisi_acc_vdev, migf);
+ if (ret) {
+ dev_err(dev, "failed to save device data!\n");
+ return -EINVAL;
+ }
+ dev_info(dev, "successful to save device data!\n");
+
+ return 0;
+}
+
+static int
+hisi_acc_vfio_pci_debug_operate(struct vfio_device *vdev, unsigned int cmd)
+{
+ int ret;
+
+ switch (cmd) {
+ case STATE_SAVE:
+ ret = hisi_acc_vf_debug_save(vdev);
+ if (ret)
+ return ret;
+ break;
+ case STATE_RESUME:
+ ret = hisi_acc_vf_debug_resume(vdev);
+ if (ret)
+ return ret;
+ break;
+ case RW_IO_TEST:
+ ret = hisi_acc_vf_debug_io(vdev);
+ if (ret)
+ return ret;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int
+hisi_acc_vfio_pci_get_device_data(struct vfio_device *vdev, char *buff)
+{
+ struct hisi_acc_vf_migration_file *debug_migf =
+ (struct hisi_acc_vf_migration_file *)vdev->vf_migration_file;
+ size_t vf_data_sz = offsetofend(struct acc_vf_data, padding);
+ struct device *dev = vdev->dev;
+
+ if (debug_migf && debug_migf->total_length) {
+ memcpy(buff, &debug_migf->vf_data, vf_data_sz);
+ return vf_data_sz;
+ }
+ dev_info(dev, "device not migrated!\n");
+
+ return 0;
+}
+
+static int
+hisi_acc_vfio_pci_get_device_attr(struct vfio_device *vdev, char *buff)
+{
+ struct hisi_acc_vf_core_device *hisi_acc_vdev = hisi_acc_get_vf_dev(vdev);
+ struct hisi_acc_vf_migration_file *debug_migf =
+ (struct hisi_acc_vf_migration_file *)vdev->vf_migration_file;
+ struct device *dev = vdev->dev;
+
+ if (debug_migf && debug_migf->total_length) {
+ scnprintf(buff, PAGE_SIZE,
+ "acc device:\n"
+ "device state: %d\n"
+ "device ready: %u\n"
+ "data valid: %d\n"
+ "data size: %lu\n",
+ hisi_acc_vdev->mig_state,
+ hisi_acc_vdev->vf_qm_state,
+ debug_migf->disabled,
+ debug_migf->total_length);
+ return PAGE_SIZE;
+ }
+ dev_info(dev, "device not migrated!\n");
+
+ 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);
@@ -1224,6 +1382,9 @@ static const struct vfio_migration_ops hisi_acc_vfio_pci_migrn_state_ops = {
.migration_set_state = hisi_acc_vfio_pci_set_device_state,
.migration_get_state = hisi_acc_vfio_pci_get_device_state,
.migration_get_data_size = hisi_acc_vfio_pci_get_data_size,
+ .migration_get_data = hisi_acc_vfio_pci_get_device_data,
+ .migration_get_attr = hisi_acc_vfio_pci_get_device_attr,
+ .migration_debug_operate = hisi_acc_vfio_pci_debug_operate,
};
static int hisi_acc_vfio_pci_migrn_init_dev(struct vfio_device *core_vdev)
@@ -1295,6 +1456,10 @@ static int hisi_acc_vfio_pci_probe(struct pci_dev *pdev, const struct pci_device
if (IS_ERR(hisi_acc_vdev))
return PTR_ERR(hisi_acc_vdev);
+ if (ops == &hisi_acc_vfio_pci_migrn_ops)
+ vfio_pci_vf_debugfs_init(&hisi_acc_vdev->core_device.vdev,
+ sizeof(struct hisi_acc_vf_migration_file));
+
dev_set_drvdata(&pdev->dev, &hisi_acc_vdev->core_device);
ret = vfio_pci_core_register_device(&hisi_acc_vdev->core_device);
if (ret)
@@ -1302,6 +1467,8 @@ static int hisi_acc_vfio_pci_probe(struct pci_dev *pdev, const struct pci_device
return 0;
out_put_vdev:
+ if (ops == &hisi_acc_vfio_pci_migrn_ops)
+ vfio_pci_vf_debugfs_exit(&hisi_acc_vdev->core_device.vdev);
vfio_put_device(&hisi_acc_vdev->core_device.vdev);
return ret;
}
@@ -1310,6 +1477,7 @@ static void hisi_acc_vfio_pci_remove(struct pci_dev *pdev)
{
struct hisi_acc_vf_core_device *hisi_acc_vdev = hisi_acc_drvdata(pdev);
+ vfio_pci_vf_debugfs_exit(&hisi_acc_vdev->core_device.vdev);
vfio_pci_core_unregister_device(&hisi_acc_vdev->core_device);
vfio_put_device(&hisi_acc_vdev->core_device.vdev);
}
diff --git a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.h b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.h
index 67343325b320..64b52fed69f2 100644
--- a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.h
+++ b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.h
@@ -49,6 +49,12 @@
#define QM_EQC_DW0 0X8000
#define QM_AEQC_DW0 0X8020
+enum mig_debug_cmd {
+ STATE_SAVE,
+ STATE_RESUME,
+ RW_IO_TEST,
+};
+
struct acc_vf_data {
#define QM_MATCH_SIZE offsetofend(struct acc_vf_data, qm_rsv_state)
/* QM match information */
--
2.24.0
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