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| author | Christian König <ckoenig.leichtzumerken@gmail.com> | 2018-06-30 02:54:55 +0200 |
|---|---|---|
| committer | Bjorn Helgaas <helgaas@kernel.org> | 2018-06-30 02:54:55 +0200 |
| commit | d3252ace0bc652a1a244455556b6a549f969bf99 (patch) | |
| tree | 322c243a9e9d1a1b2394e8d36beca5cf5346dd60 /drivers/pci/pci.c | |
| parent | PCI: Clean up resource allocation in devm_of_pci_get_host_bridge_resources() (diff) | |
| download | linux-d3252ace0bc652a1a244455556b6a549f969bf99.tar.xz linux-d3252ace0bc652a1a244455556b6a549f969bf99.zip | |
PCI: Restore resized BAR state on resume
Resize BARs after resume to the expected size again.
BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=199959
Fixes: d6895ad39f3b ("drm/amdgpu: resize VRAM BAR for CPU access v6")
Fixes: 276b738deb5b ("PCI: Add resizable BAR infrastructure")
Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
CC: stable@vger.kernel.org # v4.15+
Diffstat (limited to 'drivers/pci/pci.c')
| -rw-r--r-- | drivers/pci/pci.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 97acba712e4e..44ccfb31363e 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -1171,6 +1171,33 @@ 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 @@ -1186,6 +1213,7 @@ 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); |