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authorChristian König <christian.koenig@amd.com>2017-10-24 14:40:20 -0500
committerBjorn Helgaas <bhelgaas@google.com>2017-10-24 14:40:20 -0500
commit276b738deb5bf856b9f6049fcd92a967f52643d7 (patch)
treecac0ccc12391b30c519e116c696955da34fdb8cb /drivers/pci/pci.h
parentcb21bc9469c4c8a4d38f52d779ccc11e4329f016 (diff)
downloadlinux-276b738deb5bf856b9f6049fcd92a967f52643d7.tar.bz2
PCI: Add resizable BAR infrastructure
Add resizable BAR infrastructure, including defines and helper functions to read the possible sizes of a BAR and update its size. See PCIe r3.1, sec 7.22. Link: https://pcisig.com/sites/default/files/specification_documents/ECN_Resizable-BAR_24Apr2008.pdf Signed-off-by: Christian König <christian.koenig@amd.com> [bhelgaas: rename to functions with "rebar" (to match #defines), drop shift #defines, drop "_MASK" suffixes, fix typos, fix kerneldoc] Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Diffstat (limited to 'drivers/pci/pci.h')
-rw-r--r--drivers/pci/pci.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index a6560c9baa52..33469a33738d 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -366,4 +366,12 @@ int acpi_get_rc_resources(struct device *dev, const char *hid, u16 segment,
struct resource *res);
#endif
+u32 pci_rebar_get_possible_sizes(struct pci_dev *pdev, int bar);
+int pci_rebar_get_current_size(struct pci_dev *pdev, int bar);
+int pci_rebar_set_size(struct pci_dev *pdev, int bar, int size);
+static inline u64 pci_rebar_size_to_bytes(int size)
+{
+ return 1ULL << (size + 20);
+}
+
#endif /* DRIVERS_PCI_H */