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Message-ID: <59b339f6-2597-bb63-20e8-7d00cc605cb1@cn.fujitsu.com>
Date: Fri, 19 Aug 2016 08:45:23 +0800
From: Zhou Jie <zhoujie2011@...fujitsu.com>
To: <alex.williamson@...hat.com>
CC: <izumi.taku@...fujitsu.com>, <fan.chen@...ystack.cn>,
<linux-kernel@...r.kernel.org>, <qemu-devel@...gnu.org>
Subject: Re: [Qemu-devel] [PATCH v3] vfio : add aer process
ping
On 2016/8/15 10:53, Zhou Jie wrote:
> ping
>
> On 2016/8/2 11:57, Zhou Jie wrote:
>> During aer err occurs and resume do following to
>> protect device from being accessed.
>> 1. Make config space read only.
>> 2. Disable INTx/MSI Interrupt.
>> 3. Do nothing for bar regions.
>>
>> Signed-off-by: Zhou Jie <zhoujie2011@...fujitsu.com>
>> ---
>> v2-v3:
>> 1. Call init_completion() in vfio_pci_probe.
>> 2. Call reinit_completion() in vfio_pci_aer_err_detected.
>> 3. Remove unnecessary brackets.
>>
>> v1-v2:
>> 1. Add aer process to vfio driver.
>>
>> drivers/vfio/pci/vfio_pci.c | 48
>> +++++++++++++++++++++++++++++++++++++
>> drivers/vfio/pci/vfio_pci_private.h | 2 ++
>> include/uapi/linux/vfio.h | 2 ++
>> 3 files changed, 52 insertions(+)
>>
>> diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
>> index d624a52..4c246a1 100644
>> --- a/drivers/vfio/pci/vfio_pci.c
>> +++ b/drivers/vfio/pci/vfio_pci.c
>> @@ -648,6 +648,15 @@ static long vfio_pci_ioctl(void *device_data,
>> struct vfio_pci_device *vdev = device_data;
>> unsigned long minsz;
>>
>> + if (vdev->aer_error_in_progress && (cmd == VFIO_DEVICE_SET_IRQS ||
>> + cmd == VFIO_DEVICE_RESET || cmd == VFIO_DEVICE_PCI_HOT_RESET)) {
>> + int ret;
>> + ret = wait_for_completion_interruptible(
>> + &vdev->aer_error_completion);
>> + if (ret)
>> + return ret;
>> + }
>> +
>> if (cmd == VFIO_DEVICE_GET_INFO) {
>> struct vfio_device_info info;
>>
>> @@ -664,6 +673,10 @@ static long vfio_pci_ioctl(void *device_data,
>> if (vdev->reset_works)
>> info.flags |= VFIO_DEVICE_FLAGS_RESET;
>>
>> + info.flags |= VFIO_DEVICE_FLAGS_AERPROCESS;
>> + if (vdev->aer_error_in_progress)
>> + info.flags |= VFIO_DEVICE_FLAGS_INAERPROCESS;
>> +
>> info.num_regions = VFIO_PCI_NUM_REGIONS + vdev->num_regions;
>> info.num_irqs = VFIO_PCI_NUM_IRQS;
>>
>> @@ -1070,6 +1083,13 @@ static ssize_t vfio_pci_rw(void *device_data,
>> char __user *buf,
>>
>> switch (index) {
>> case VFIO_PCI_CONFIG_REGION_INDEX:
>> + if (vdev->aer_error_in_progress && iswrite) {
>> + int ret;
>> + ret = wait_for_completion_interruptible(
>> + &vdev->aer_error_completion);
>> + if (ret)
>> + return ret;
>> + }
>> return vfio_pci_config_rw(vdev, buf, count, ppos, iswrite);
>>
>> case VFIO_PCI_ROM_REGION_INDEX:
>> @@ -1228,6 +1248,7 @@ static int vfio_pci_probe(struct pci_dev *pdev,
>> const struct pci_device_id *id)
>> vdev->irq_type = VFIO_PCI_NUM_IRQS;
>> mutex_init(&vdev->igate);
>> spin_lock_init(&vdev->irqlock);
>> + init_completion(&vdev->aer_error_completion);
>>
>> ret = vfio_add_group_dev(&pdev->dev, &vfio_pci_ops, vdev);
>> if (ret) {
>> @@ -1300,6 +1321,11 @@ static pci_ers_result_t
>> vfio_pci_aer_err_detected(struct pci_dev *pdev,
>>
>> mutex_lock(&vdev->igate);
>>
>> + vdev->aer_error_in_progress = true;
>> + reinit_completion(&vdev->aer_error_completion);
>> + vfio_pci_set_irqs_ioctl(vdev, VFIO_IRQ_SET_DATA_NONE |
>> + VFIO_IRQ_SET_ACTION_TRIGGER,
>> + vdev->irq_type, 0, 0, NULL);
>> if (vdev->err_trigger)
>> eventfd_signal(vdev->err_trigger, 1);
>>
>> @@ -1310,8 +1336,30 @@ static pci_ers_result_t
>> vfio_pci_aer_err_detected(struct pci_dev *pdev,
>> return PCI_ERS_RESULT_CAN_RECOVER;
>> }
>>
>> +static void vfio_pci_aer_resume(struct pci_dev *pdev)
>> +{
>> + struct vfio_pci_device *vdev;
>> + struct vfio_device *device;
>> +
>> + device = vfio_device_get_from_dev(&pdev->dev);
>> + if (device == NULL)
>> + return;
>> +
>> + vdev = vfio_device_data(device);
>> + if (vdev == NULL) {
>> + vfio_device_put(device);
>> + return;
>> + }
>> +
>> + vdev->aer_error_in_progress = false;
>> + complete_all(&vdev->aer_error_completion);
>> +
>> + vfio_device_put(device);
>> +}
>> +
>> static const struct pci_error_handlers vfio_err_handlers = {
>> .error_detected = vfio_pci_aer_err_detected,
>> + .resume = vfio_pci_aer_resume,
>> };
>>
>> static struct pci_driver vfio_pci_driver = {
>> diff --git a/drivers/vfio/pci/vfio_pci_private.h
>> b/drivers/vfio/pci/vfio_pci_private.h
>> index 2128de8..7430d92 100644
>> --- a/drivers/vfio/pci/vfio_pci_private.h
>> +++ b/drivers/vfio/pci/vfio_pci_private.h
>> @@ -91,6 +91,8 @@ struct vfio_pci_device {
>> bool has_vga;
>> bool needs_reset;
>> bool nointx;
>> + bool aer_error_in_progress;
>> + struct completion aer_error_completion;
>> struct pci_saved_state *pci_saved_state;
>> int refcnt;
>> struct eventfd_ctx *err_trigger;
>> diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
>> index 255a211..59b9cf6 100644
>> --- a/include/uapi/linux/vfio.h
>> +++ b/include/uapi/linux/vfio.h
>> @@ -198,6 +198,8 @@ struct vfio_device_info {
>> #define VFIO_DEVICE_FLAGS_PCI (1 << 1) /* vfio-pci device */
>> #define VFIO_DEVICE_FLAGS_PLATFORM (1 << 2) /* vfio-platform
>> device */
>> #define VFIO_DEVICE_FLAGS_AMBA (1 << 3) /* vfio-amba device */
>> +#define VFIO_DEVICE_FLAGS_AERPROCESS (1 << 4) /* support aer
>> error progress */
>> +#define VFIO_DEVICE_FLAGS_INAERPROCESS (1 << 5)/* status in aer
>> error progress */
>> __u32 num_regions; /* Max region index + 1 */
>> __u32 num_irqs; /* Max IRQ index + 1 */
>> };
>>
>
--
------------------------------------------------
周潔
Dept 1
No. 6 Wenzhu Road,
Nanjing, 210012, China
TEL：+86+25-86630566-8557
FUJITSU INTERNAL：7998-8557
E-Mail：zhoujie2011@...fujitsu.com
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