vfio-pci: Test device reset capabilities
Not all resets are created equal. PM reset is not very reliable, especially for GPUs, so we might want to opt for a bus reset if a standard reset will only do a D3hot->D0 transition. We can also use this to tell if the standard reset will do a bus reset (if neither has_pm_reset or has_flr is probed, but the device still supports reset). Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
parent
c7679d450e
commit
befe5176ef
|
@ -185,6 +185,8 @@ typedef struct VFIODevice {
|
|||
bool reset_works;
|
||||
bool has_vga;
|
||||
bool pci_aer;
|
||||
bool has_flr;
|
||||
bool has_pm_reset;
|
||||
} VFIODevice;
|
||||
|
||||
typedef struct VFIOGroup {
|
||||
|
@ -2513,6 +2515,42 @@ static int vfio_setup_pcie_cap(VFIODevice *vdev, int pos, uint8_t size)
|
|||
return pos;
|
||||
}
|
||||
|
||||
static void vfio_check_pcie_flr(VFIODevice *vdev, uint8_t pos)
|
||||
{
|
||||
uint32_t cap = pci_get_long(vdev->pdev.config + pos + PCI_EXP_DEVCAP);
|
||||
|
||||
if (cap & PCI_EXP_DEVCAP_FLR) {
|
||||
DPRINTF("%04x:%02x:%02x.%x Supports FLR via PCIe cap\n",
|
||||
vdev->host.domain, vdev->host.bus, vdev->host.slot,
|
||||
vdev->host.function);
|
||||
vdev->has_flr = true;
|
||||
}
|
||||
}
|
||||
|
||||
static void vfio_check_pm_reset(VFIODevice *vdev, uint8_t pos)
|
||||
{
|
||||
uint16_t csr = pci_get_word(vdev->pdev.config + pos + PCI_PM_CTRL);
|
||||
|
||||
if (!(csr & PCI_PM_CTRL_NO_SOFT_RESET)) {
|
||||
DPRINTF("%04x:%02x:%02x.%x Supports PM reset\n",
|
||||
vdev->host.domain, vdev->host.bus, vdev->host.slot,
|
||||
vdev->host.function);
|
||||
vdev->has_pm_reset = true;
|
||||
}
|
||||
}
|
||||
|
||||
static void vfio_check_af_flr(VFIODevice *vdev, uint8_t pos)
|
||||
{
|
||||
uint8_t cap = pci_get_byte(vdev->pdev.config + pos + PCI_AF_CAP);
|
||||
|
||||
if ((cap & PCI_AF_CAP_TP) && (cap & PCI_AF_CAP_FLR)) {
|
||||
DPRINTF("%04x:%02x:%02x.%x Supports FLR via AF cap\n",
|
||||
vdev->host.domain, vdev->host.bus, vdev->host.slot,
|
||||
vdev->host.function);
|
||||
vdev->has_flr = true;
|
||||
}
|
||||
}
|
||||
|
||||
static int vfio_add_std_cap(VFIODevice *vdev, uint8_t pos)
|
||||
{
|
||||
PCIDevice *pdev = &vdev->pdev;
|
||||
|
@ -2557,13 +2595,21 @@ static int vfio_add_std_cap(VFIODevice *vdev, uint8_t pos)
|
|||
ret = vfio_setup_msi(vdev, pos);
|
||||
break;
|
||||
case PCI_CAP_ID_EXP:
|
||||
vfio_check_pcie_flr(vdev, pos);
|
||||
ret = vfio_setup_pcie_cap(vdev, pos, size);
|
||||
break;
|
||||
case PCI_CAP_ID_MSIX:
|
||||
ret = vfio_setup_msix(vdev, pos);
|
||||
break;
|
||||
case PCI_CAP_ID_PM:
|
||||
vfio_check_pm_reset(vdev, pos);
|
||||
vdev->pm_cap = pos;
|
||||
ret = pci_add_capability(pdev, cap_id, pos, size);
|
||||
break;
|
||||
case PCI_CAP_ID_AF:
|
||||
vfio_check_af_flr(vdev, pos);
|
||||
ret = pci_add_capability(pdev, cap_id, pos, size);
|
||||
break;
|
||||
default:
|
||||
ret = pci_add_capability(pdev, cap_id, pos, size);
|
||||
break;
|
||||
|
|
Loading…
Reference in a new issue