PCI: Stop caching ATS Invalidate Queue Depth
Stop caching the Invalidate Queue Depth in struct pci_dev.
pci_ats_queue_depth() is typically called only once per device, and it
returns a fixed value per-device, so callers who need the value frequently
can cache it themselves.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Joerg Roedel <jroedel@suse.de>
diff --git a/drivers/pci/ats.c b/drivers/pci/ats.c
index 9355f75..ceda7dc 100644
--- a/drivers/pci/ats.c
+++ b/drivers/pci/ats.c
@@ -20,16 +20,12 @@
void pci_ats_init(struct pci_dev *dev)
{
int pos;
- u16 cap;
pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ATS);
if (!pos)
return;
dev->ats_cap = pos;
- pci_read_config_word(dev, dev->ats_cap + PCI_ATS_CAP, &cap);
- dev->ats_qdep = PCI_ATS_CAP_QDEP(cap) ? PCI_ATS_CAP_QDEP(cap) :
- PCI_ATS_MAX_QDEP;
}
/**
@@ -131,13 +127,16 @@
*/
int pci_ats_queue_depth(struct pci_dev *dev)
{
+ u16 cap;
+
if (!dev->ats_cap)
return -EINVAL;
if (dev->is_virtfn)
return 0;
- return dev->ats_qdep;
+ pci_read_config_word(dev, dev->ats_cap + PCI_ATS_CAP, &cap);
+ return PCI_ATS_CAP_QDEP(cap) ? PCI_ATS_CAP_QDEP(cap) : PCI_ATS_MAX_QDEP;
}
EXPORT_SYMBOL_GPL(pci_ats_queue_depth);