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| author | Bjorn Helgaas <bhelgaas@google.com> | 2015-07-20 09:24:32 -0500 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2015-08-13 15:59:58 -0500 |
| commit | a71f938f3a9a7bc879296cd34ecae9effe5edf3f (patch) | |
| tree | 87649fae821222f40fc9a15231623fc3dcdc25a9 /drivers/pci/ats.c | |
| parent | ff9bee895c4d11a519a6b2c49451376025a6af4e (diff) | |
| download | linux-a71f938f3a9a7bc879296cd34ecae9effe5edf3f.tar.gz linux-a71f938f3a9a7bc879296cd34ecae9effe5edf3f.tar.bz2 linux-a71f938f3a9a7bc879296cd34ecae9effe5edf3f.zip | |
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>
Diffstat (limited to 'drivers/pci/ats.c')
| -rw-r--r-- | drivers/pci/ats.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/drivers/pci/ats.c b/drivers/pci/ats.c index 9355f754c7c2..ceda7dc556d4 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 @@ 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); |