On Fri, Oct 27, 2023 at 11:38:11AM +0300, Ilpo Järvinen wrote:
> Instead of open-coded masking and shifting with PCI_CONF1_* bitfields,
> use GENMASK() and FIELD_PREP(), and then remove the *_SHIFT defines
> that are no longer needed.
>
> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
> ---
>
> drivers/pci/pci.h | 23 ++++++++++-------------
> 1 file changed, 10 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
> index 39a8932dc340..31da9fde8aca 100644
> --- a/drivers/pci/pci.h
> +++ b/drivers/pci/pci.h
> @@ -2,6 +2,8 @@
> #ifndef DRIVERS_PCI_H
> #define DRIVERS_PCI_H
>
> +#include <linux/bitfield.h>
> +#include <linux/bits.h>
> #include <linux/pci.h>
>
> /* Number of possible devfns: 0.0 to 1f.7 inclusive */
> @@ -797,19 +799,15 @@ static inline pci_power_t mid_pci_get_power_state(struct pci_dev *pdev)
> * Section 3.2.2.3.2, Figure 3-2, p. 50.
> */
>
> -#define PCI_CONF1_BUS_SHIFT 16 /* Bus number */
> -#define PCI_CONF1_DEV_SHIFT 11 /* Device number */
> -#define PCI_CONF1_FUNC_SHIFT 8 /* Function number */
> -
> -#define PCI_CONF1_BUS_MASK 0xff
> -#define PCI_CONF1_DEV_MASK 0x1f
> -#define PCI_CONF1_FUNC_MASK 0x7
> +#define PCI_CONF1_BUS_MASK GENMASK(23, 16)
> +#define PCI_CONF1_DEV_MASK GENMASK(15, 11)
> +#define PCI_CONF1_FUNC_MASK GENMASK(10, 8)
> #define PCI_CONF1_REG_MASK 0xfc /* Limit aligned offset to a maximum of 256B */
>
> #define PCI_CONF1_ENABLE BIT(31)
> -#define PCI_CONF1_BUS(x) (((x) & PCI_CONF1_BUS_MASK) << PCI_CONF1_BUS_SHIFT)
> -#define PCI_CONF1_DEV(x) (((x) & PCI_CONF1_DEV_MASK) << PCI_CONF1_DEV_SHIFT)
> -#define PCI_CONF1_FUNC(x) (((x) & PCI_CONF1_FUNC_MASK) << PCI_CONF1_FUNC_SHIFT)
> +#define PCI_CONF1_BUS(x) FIELD_PREP(PCI_CONF1_BUS_MASK, (x))
> +#define PCI_CONF1_DEV(x) FIELD_PREP(PCI_CONF1_DEV_MASK, (x))
> +#define PCI_CONF1_FUNC(x) FIELD_PREP(PCI_CONF1_FUNC_MASK, (x))
> #define PCI_CONF1_REG(x) ((x) & PCI_CONF1_REG_MASK)
I love getting rid of the _SHIFT #defines.
I'm a dinosaur and haven't been completely converted to the wonders of
GENMASK yet. PCI_CONF1_ADDRESS is the only user of PCI_CONF1_BUS etc,
so I think this would be simpler overall:
#define PCI_CONF1_BUS 0x00ff0000
#define PCI_CONF1_DEV 0x0000f800
#define PCI_CONF1_FUNC 0x00000700
#define PCI_CONF1_REG 0x000000ff
#define PCI_CONF1_ADDRESS(bus, dev, func, reg) \
(FIELD_PREP(PCI_CONF1_BUS, (bus)) | \
FIELD_PREP(PCI_CONF1_DEV, (dev)) | \
FIELD_PREP(PCI_CONF1_FUNC, (func)) | \
FIELD_PREP(PCI_CONF1_REG, (reg & ~0x3)))
The v6.7 merge window just opened, and I won't start merging v6.8
material until v6.7-rc1 (probably Nov 12), so no hurry on this.
Bjorn
