PCI: Reduce size of ATS structure elements (67930995) · Commits · 戴 / test

The extended capabilities list is linked with 12-bit pointers, and the ATS Smallest Translation Unit and Invalidate Queue Depth fields are both 5 bits. Use u16 and u8 to hold the extended capability address and the stu and qdep values. No functional change. Signed-off-by:

Bjorn Helgaas <bhelgaas@google.com> Reviewed-by:

Joerg Roedel <jroedel@suse.de>

include/linux/pci.h

+3 −3

Original line number	Diff line number	Diff line
		@@ -376,9 +376,9 @@ struct pci_dev {
		struct pci_sriov sriov; / SR-IOV capability related */
		struct pci_dev physfn; / the PF this VF is associated with */
		};
		int ats_cap; /* ATS Capability offset */
		int ats_stu; /* ATS Smallest Translation Unit */
		int ats_qdep; /* ATS Invalidate Queue Depth */
		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 */

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