On Wednesday 18 May 2022 14:23:22 Bjorn Helgaas wrote: > On Sun, Feb 20, 2022 at 08:33:32PM +0100, Marek Behún wrote: > > From: Pali Rohár <pali@xxxxxxxxxx> > > > > These macros allows to easily compose and extract Slot Power Limit and > > Physical Slot Number values from Slot Capability Register. > > > > Signed-off-by: Pali Rohár <pali@xxxxxxxxxx> > > Signed-off-by: Marek Behún <kabel@xxxxxxxxxx> > > Acked-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx> > > We talked about using FIELD_PREP() / FIELD_GET(), which I think would > remove the need for the *_SHIFT macros. But we can always do that > later. I have already done this for pci-mvebu.c driver and patch was merged: https://lore.kernel.org/linux-pci/20220412094946.27069-5-pali@xxxxxxxxxx/ IIRC we have decided to not use those *_SHIFT macros as it would flood public uapi file and from this file we cannot remove macros due to userspace backward compatibility. > > --- > > include/uapi/linux/pci_regs.h | 3 +++ > > 1 file changed, 3 insertions(+) > > > > diff --git a/include/uapi/linux/pci_regs.h b/include/uapi/linux/pci_regs.h > > index bee1a9ed6e66..d825e17e448c 100644 > > --- a/include/uapi/linux/pci_regs.h > > +++ b/include/uapi/linux/pci_regs.h > > @@ -591,10 +591,13 @@ > > #define PCI_EXP_SLTCAP_HPS 0x00000020 /* Hot-Plug Surprise */ > > #define PCI_EXP_SLTCAP_HPC 0x00000040 /* Hot-Plug Capable */ > > #define PCI_EXP_SLTCAP_SPLV 0x00007f80 /* Slot Power Limit Value */ > > +#define PCI_EXP_SLTCAP_SPLV_SHIFT 7 /* Slot Power Limit Value shift */ > > #define PCI_EXP_SLTCAP_SPLS 0x00018000 /* Slot Power Limit Scale */ > > +#define PCI_EXP_SLTCAP_SPLS_SHIFT 15 /* Slot Power Limit Scale shift */ > > #define PCI_EXP_SLTCAP_EIP 0x00020000 /* Electromechanical Interlock Present */ > > #define PCI_EXP_SLTCAP_NCCS 0x00040000 /* No Command Completed Support */ > > #define PCI_EXP_SLTCAP_PSN 0xfff80000 /* Physical Slot Number */ > > +#define PCI_EXP_SLTCAP_PSN_SHIFT 19 /* Physical Slot Number shift */ > > #define PCI_EXP_SLTCTL 0x18 /* Slot Control */ > > #define PCI_EXP_SLTCTL_ABPE 0x0001 /* Attention Button Pressed Enable */ > > #define PCI_EXP_SLTCTL_PFDE 0x0002 /* Power Fault Detected Enable */ > > -- > > 2.34.1 > >
