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igb_uio: issue FLR during open and release of device file

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Set UIO info device file operations open and release. Call pci reset
function inside open and release to clear device state at start and end.
Copied this behaviour from vfio_pci kernel module code. With this patch,
it is not mandatory to issue FLR by PMD's during init and close.

Bus master enable and disable are added in open and release respectively
to take care of device DMA.

Signed-off-by: Shijith Thotton <shijith.thotton@caviumnetworks.com>
Reviewed-by: Jianfeng Tan <jianfeng.tan@intel.com>
Acked-by: Ferruh Yigit <ferruh.yigit@intel.com>
Acked-by: Gregory Etelson <gregory@weka.io>
This commit is contained in:
Shijith Thotton 2017-07-07 16:43:51 +05:30 committed by Thomas Monjalon
parent a00cbb4586
commit b58eedfc7d
1 changed files with 33 additions and 0 deletions
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33
lib/librte_eal/linuxapp/igb_uio/igb_uio.c
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@ -170,6 +170,37 @@ igbuio_pci_irqhandler(int irq, struct uio_info *info)
return IRQ_HANDLED;
}
/**
* This gets called while opening uio device file.
*/
static int
igbuio_pci_open(struct uio_info *info, struct inode *inode)
{
struct rte_uio_pci_dev *udev = info->priv;
struct pci_dev *dev = udev->pdev;
pci_reset_function(dev);
/* set bus master, which was cleared by the reset function */
pci_set_master(dev);
return 0;
}
static int
igbuio_pci_release(struct uio_info *info, struct inode *inode)
{
struct rte_uio_pci_dev *udev = info->priv;
struct pci_dev *dev = udev->pdev;
/* stop the device from further DMA */
pci_clear_master(dev);
pci_reset_function(dev);
return 0;
}
#ifdef CONFIG_XEN_DOM0
static int
igbuio_dom0_mmap_phys(struct uio_info *info, struct vm_area_struct *vma)
@ -372,6 +403,8 @@ igbuio_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
udev->info.version = "0.1";
udev->info.handler = igbuio_pci_irqhandler;
udev->info.irqcontrol = igbuio_pci_irqcontrol;
udev->info.open = igbuio_pci_open;
udev->info.release = igbuio_pci_release;
#ifdef CONFIG_XEN_DOM0
/* check if the driver run on Xen Dom0 */
if (xen_initial_domain())