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[RFC,v3,09/21] PCI: Mark immovable BARs with PCI_FIXED

Message ID 20190204153601.7576-10-s.miroshnichenko@yadro.com
State Superseded
Delegated to: Bjorn Helgaas
Headers show
Series PCI: Allow BAR movement during hotplug | expand

Commit Message

Sergei Miroshnichenko Feb. 4, 2019, 3:35 p.m. UTC 
If a PCIe device driver doesn't yet have support for movable BARs,
mark device's BARs with IORESOURCE_PCI_FIXED.

Signed-off-by: Sergey Miroshnichenko <s.miroshnichenko@yadro.com>
---
 drivers/pci/probe.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
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Patch

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 7fe68b4f04bf..1f50eb556d28 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -3186,6 +3186,21 @@  static void pci_bus_rescan_prepare(struct pci_bus *bus)
 		} else if (dev->driver &&
 			   dev->driver->rescan_prepare) {
 			dev->driver->rescan_prepare(dev);
+		} else if (dev->driver || ((dev->class >> 8) == PCI_CLASS_DISPLAY_VGA)) {
+			int i;
+
+			for (i = 0; i < PCI_NUM_RESOURCES; i++) {
+				struct resource *r = &dev->resource[i];
+
+				if (!r->flags || !r->parent ||
+				    (r->flags & IORESOURCE_UNSET) ||
+				    (r->flags & IORESOURCE_PCI_FIXED))
+					continue;
+
+				r->flags |= IORESOURCE_PCI_FIXED;
+				pci_warn(dev, "%s: no support for movable BARs, mark BAR %d (%pR) as fixed\n",
+					 __func__, i, r);
+			}
 		}
 	}
 }