[PATCH v3 1/7] PCI: Ignore enforced alignment when kernel uses existing firmware setup
From: Yongji Xie <hidden>
Date: 2016-06-30 10:53:36
Also in:
linux-pci, lkml
Subsystem:
pci subsystem, the rest · Maintainers:
Bjorn Helgaas, Linus Torvalds
PCI resources allocator will use firmware setup and not try to reassign resource when PCI_PROBE_ONLY or IORESOURCE_PCI_FIXED is set. The enforced alignment in pci_reassigndev_resource_alignment() should be ignored in this case. Otherwise, some PCI devices' resources would be released here and not re-allocated. Signed-off-by: Yongji Xie <redacted> --- drivers/pci/pci.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index c8b4dbd..be8f72c 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c@@ -4760,6 +4760,13 @@ static resource_size_t pci_specified_resource_alignment(struct pci_dev *dev) spin_lock(&resource_alignment_lock); p = resource_alignment_param; + if (pci_has_flag(PCI_PROBE_ONLY)) { + if (*p) + printk_once(KERN_INFO "PCI: Ignore resource_alignment parameter: %s with PCI_PROBE_ONLY set\n", + p); + spin_unlock(&resource_alignment_lock); + return 0; + } while (*p) { count = 0; if (sscanf(p, "%d%n", &align_order, &count) == 1 &&
@@ -4837,6 +4844,11 @@ void pci_reassigndev_resource_alignment(struct pci_dev *dev) r = &dev->resource[i]; if (!(r->flags & IORESOURCE_MEM)) continue; + if (r->flags & IORESOURCE_PCI_FIXED) { + dev_info(&dev->dev, "No alignment for fixed BAR%d: %pR\n", + i, r); + continue; + } size = resource_size(r); if (size < align) { size = align;
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1.7.9.5