Hi Gavin,
On 2016/7/1 8:28, Gavin Shan wrote:
On Thu, Jun 30, 2016 at 06:53:07PM +0800, Yongji Xie wrote:
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 <xyjxie@xxxxxxxxxxxxxxxxxx>
---
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);
We don't have to print @resource_alignment as it's ignored completely.
The content included in it doesn't mean anything:
pr_info_once("PCI: resource_alignment ignored with PCI_PROBE_ONLY\n");
OK. It looks simpler now.
+ spin_unlock(&resource_alignment_lock);
+ return 0;
+ }
A empty line is needed here.
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);
The message would be like below to match PCI code style. I'm thinking it probably
uses dev_dbg() instead dev_info(), but not sure for 100%.
dev_info(&dev->dev, "BAR %d: fixed %pR, no alignment\n", i, r);
Maybe dev_info() is OK.:-)
+ continue;
+ }
A empty line is needed here.
size = resource_size(r);
if (size < align) {
size = align;
Thanks,
Gavin
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