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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>
This commit is contained in:
Bjorn Helgaas 2015-07-20 09:24:32 -05:00
parent ff9bee895c
commit a71f938f3a
2 changed files with 4 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/pci/ats.c
View File

@ -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 @@ EXPORT_SYMBOL_GPL(pci_restore_ats_state);
*/
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);

1
include/linux/pci.h
View File

@ -378,7 +378,6 @@ struct pci_dev {
};
u16 ats_cap; /* ATS Capability offset */
u8 ats_stu; /* ATS Smallest Translation Unit */
u8 ats_qdep; /* ATS Invalidate Queue Depth */
atomic_t ats_ref_cnt; /* number of VFs with ATS enabled */
#endif
phys_addr_t rom; /* Physical address of ROM if it's not from the BAR */