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>
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@ -20,16 +20,12 @@
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void pci_ats_init(struct pci_dev *dev)
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{
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int pos;
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u16 cap;
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pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ATS);
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if (!pos)
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return;
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dev->ats_cap = pos;
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pci_read_config_word(dev, dev->ats_cap + PCI_ATS_CAP, &cap);
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dev->ats_qdep = PCI_ATS_CAP_QDEP(cap) ? PCI_ATS_CAP_QDEP(cap) :
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PCI_ATS_MAX_QDEP;
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}
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/**
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@ -131,13 +127,16 @@ EXPORT_SYMBOL_GPL(pci_restore_ats_state);
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*/
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int pci_ats_queue_depth(struct pci_dev *dev)
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{
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u16 cap;
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if (!dev->ats_cap)
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return -EINVAL;
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if (dev->is_virtfn)
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return 0;
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return dev->ats_qdep;
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pci_read_config_word(dev, dev->ats_cap + PCI_ATS_CAP, &cap);
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return PCI_ATS_CAP_QDEP(cap) ? PCI_ATS_CAP_QDEP(cap) : PCI_ATS_MAX_QDEP;
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}
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EXPORT_SYMBOL_GPL(pci_ats_queue_depth);
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@ -378,7 +378,6 @@ struct pci_dev {
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};
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u16 ats_cap; /* ATS Capability offset */
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u8 ats_stu; /* ATS Smallest Translation Unit */
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u8 ats_qdep; /* ATS Invalidate Queue Depth */
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atomic_t ats_ref_cnt; /* number of VFs with ATS enabled */
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#endif
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phys_addr_t rom; /* Physical address of ROM if it's not from the BAR */
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