On Thu, Jun 14, 2018 at 02:21:45PM +0200, Christian König wrote: > Resize BARs after resume to the expected size again. > > Signed-off-by: Christian König <christian.koenig@xxxxxxx> > BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=199959 > CC: stable@xxxxxxxxxxxxxxx # v4.15+ I added Fixes: d6895ad39f3b ("drm/amdgpu: resize VRAM BAR for CPU access v6") Fixes: 276b738deb5b ("PCI: Add resizable BAR infrastructure") Per the bugzilla, the bug was bisected to d6895ad39f3b, which appeared in v4.16. But 276b738deb5b appeared in v4.15, so I'm OK with the v4.15+ stable tag. > --- > drivers/pci/pci.c | 28 ++++++++++++++++++++++++++++ > 1 file changed, 28 insertions(+) > > diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c > index bd6f156dc3cf..d4685090378b 100644 > --- a/drivers/pci/pci.c > +++ b/drivers/pci/pci.c > @@ -1159,6 +1159,33 @@ static void pci_restore_config_space(struct pci_dev *pdev) > } > } > > +static void pci_restore_rebar_state(struct pci_dev *pdev) > +{ > + unsigned int pos, nbars, i; > + u32 ctrl; > + > + pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_REBAR); > + if (!pos) > + return; > + > + pci_read_config_dword(pdev, pos + PCI_REBAR_CTRL, &ctrl); > + nbars = (ctrl & PCI_REBAR_CTRL_NBAR_MASK) >> > + PCI_REBAR_CTRL_NBAR_SHIFT; > + > + for (i = 0; i < nbars; i++, pos += 8) { > + struct resource *res; > + int bar_idx, size; > + > + pci_read_config_dword(pdev, pos + PCI_REBAR_CTRL, &ctrl); > + bar_idx = ctrl & PCI_REBAR_CTRL_BAR_IDX; > + res = pdev->resource + bar_idx; > + size = order_base_2((resource_size(res) >> 20) | 1) - 1; > + ctrl &= ~PCI_REBAR_CTRL_BAR_SIZE; > + ctrl |= size << 8; > + pci_write_config_dword(pdev, pos + PCI_REBAR_CTRL, ctrl); > + } > +} > + > /** > * pci_restore_state - Restore the saved state of a PCI device > * @dev: - PCI device that we're dealing with > @@ -1174,6 +1201,7 @@ void pci_restore_state(struct pci_dev *dev) > pci_restore_pri_state(dev); > pci_restore_ats_state(dev); > pci_restore_vc_state(dev); > + pci_restore_rebar_state(dev); > > pci_cleanup_aer_error_status_regs(dev); > > -- > 2.14.1 >
