On Mon, Mar 13, 2017 at 01:41:33PM +0100, Christian König wrote: > From: Christian König <christian.koenig@xxxxxxx> > > Just the defines and helper functions to read the possible sizes of a BAR and > update it's size. s/it's/its/ > See https://pcisig.com/sites/default/files/specification_documents/ECN_Resizable-BAR_24Apr2008.pdf. It's good to have the public ECN that anybody can read, but we should also have a reference to the full spec that incorporates it, e.g., PCIe r3.1, sec 7.22. > --- a/include/linux/pci.h > +++ b/include/linux/pci.h > @@ -1946,6 +1946,9 @@ void pci_request_acs(void); > bool pci_acs_enabled(struct pci_dev *pdev, u16 acs_flags); > bool pci_acs_path_enabled(struct pci_dev *start, > struct pci_dev *end, u16 acs_flags); > +u32 pci_rbar_get_possible_sizes(struct pci_dev *pdev, int bar); > +int pci_rbar_get_current_size(struct pci_dev *pdev, int bar); > +int pci_rbar_set_size(struct pci_dev *pdev, int bar, int size); These should be declared in drivers/pci/pci.h unless they're needed outside drivers/pci. I hope they aren't needed outside, because they're not safe to use after the PCI core has claimed resources. > #define PCI_VPD_LRDT 0x80 /* Large Resource Data Type */ > #define PCI_VPD_LRDT_ID(x) ((x) | PCI_VPD_LRDT) > diff --git a/include/uapi/linux/pci_regs.h b/include/uapi/linux/pci_regs.h > index e5a2e68..6de29d6 100644 > --- a/include/uapi/linux/pci_regs.h > +++ b/include/uapi/linux/pci_regs.h > @@ -932,9 +932,16 @@ > #define PCI_SATA_SIZEOF_LONG 16 > > /* Resizable BARs */ > +#define PCI_REBAR_CAP 4 /* capability register */ > +#define PCI_REBAR_CTRL_SIZES_MASK (0xFFFFF << 4) /* mask for sizes */ > +#define PCI_REBAR_CTRL_SIZES_SHIFT 4 /* shift for sizes */ > #define PCI_REBAR_CTRL 8 /* control register */ > +#define PCI_REBAR_CTRL_BAR_IDX_MASK (7 << 0) /* mask for bar index */ > +#define PCI_REBAR_CTRL_BAR_IDX_SHIFT 0 /* shift for bar index */ > #define PCI_REBAR_CTRL_NBAR_MASK (7 << 5) /* mask for # bars */ > #define PCI_REBAR_CTRL_NBAR_SHIFT 5 /* shift for # bars */ > +#define PCI_REBAR_CTRL_BAR_SIZE_MASK (0x1F << 8) /* mask for bar size */ > +#define PCI_REBAR_CTRL_BAR_SIZE_SHIFT 8 /* shift for bar size */ s/bar/BAR/ several places above > /* Dynamic Power Allocation */ > #define PCI_DPA_CAP 4 /* capability register */ > -- > 2.7.4 >
