On Sun, 2020-11-29 at 23:07 +0000, Krzysztof Wilczyński wrote:
> Add ECAM-related constants to provide a set of standard constants
> defining memory address shift values to the byte-level address that can
> be used to access the PCI Express Configuration Space, and then move
> native PCI Express controller drivers to use the newly introduced
> definitions retiring driver-specific ones.
>
> Refactor pci_ecam_map_bus() function to use newly added constants so
> that limits to the bus, device function and offset (now limited to 4K as
> per the specification) are in place to prevent the defective or
> malicious caller from supplying incorrect configuration offset and thus
> targeting the wrong device when accessing extended configuration space.
> This refactor also allows for the ".bus_shit" initialisers to be dropped
> when the user is not using a custom value as a default value will be
> used as per the PCI Express Specification.
>
> Suggested-by: Bjorn Helgaas <bhelg...@google.com>
> Signed-off-by: Krzysztof Wilczyński <k...@linux.com>
> ---
> drivers/pci/controller/dwc/pcie-al.c | 12 ++-------
> drivers/pci/controller/dwc/pcie-hisi.c | 2 --
> drivers/pci/controller/pci-aardvark.c | 13 +++-------
> drivers/pci/controller/pci-host-generic.c | 1 -
> drivers/pci/controller/pci-thunder-ecam.c | 1 -
> drivers/pci/controller/pcie-brcmstb.c | 16 ++----------
> drivers/pci/controller/pcie-rockchip-host.c | 27 ++++++++++-----------
> drivers/pci/controller/pcie-rockchip.h | 8 +-----
> drivers/pci/controller/pcie-tango.c | 1 -
> drivers/pci/controller/pcie-xilinx-nwl.c | 9 ++-----
> drivers/pci/controller/pcie-xilinx.c | 11 ++-------
> drivers/pci/controller/vmd.c | 11 ++++-----
> drivers/pci/ecam.c | 23 ++++++++++++------
> include/linux/pci-ecam.h | 27 +++++++++++++++++++++
> 14 files changed, 73 insertions(+), 89 deletions(-)
>
> diff --git a/drivers/pci/controller/dwc/pcie-al.c
> b/drivers/pci/controller/dwc/pcie-al.c
> index f973fbca90cf..af9e51ab1af8 100644
> --- a/drivers/pci/controller/dwc/pcie-al.c
> +++ b/drivers/pci/controller/dwc/pcie-al.c
> @@ -76,7 +76,6 @@ static int al_pcie_init(struct pci_config_window *cfg)
> }
>
> const struct pci_ecam_ops al_pcie_ops = {
> - .bus_shift = 20,
> .init = al_pcie_init,
> .pci_ops = {
> .map_bus = al_pcie_map_bus,
> @@ -138,8 +137,6 @@ struct al_pcie {
> struct al_pcie_target_bus_cfg target_bus_cfg;
> };
>
> -#define PCIE_ECAM_DEVFN(x) (((x) & 0xff) << 12)
> -
> #define to_al_pcie(x) dev_get_drvdata((x)->dev)
>
> static inline u32 al_pcie_controller_readl(struct al_pcie *pcie, u32 offset)
> @@ -226,11 +223,6 @@ static void __iomem *al_pcie_conf_addr_map_bus(struct
> pci_bus *bus,
> struct al_pcie_target_bus_cfg *target_bus_cfg = &pcie->target_bus_cfg;
> unsigned int busnr_ecam = busnr & target_bus_cfg->ecam_mask;
> unsigned int busnr_reg = busnr & target_bus_cfg->reg_mask;
> - void __iomem *pci_base_addr;
> -
> - pci_base_addr = (void __iomem *)((uintptr_t)pp->va_cfg0_base +
> - (busnr_ecam << 20) +
> - PCIE_ECAM_DEVFN(devfn));
>
> if (busnr_reg != target_bus_cfg->reg_val) {
> dev_dbg(pcie->pci->dev, "Changing target bus busnum val from
> 0x%x to 0x%x\n",
> @@ -241,7 +233,7 @@ static void __iomem *al_pcie_conf_addr_map_bus(struct
> pci_bus *bus,
> target_bus_cfg->reg_mask);
> }
>
> - return pci_base_addr + where;
> + return pp->va_cfg0_base + PCIE_ECAM_OFFSET(busnr_ecam, devfn, where);
> }
>
> static struct pci_ops al_child_pci_ops = {
> @@ -264,7 +256,7 @@ static void al_pcie_config_prepare(struct al_pcie *pcie)
>
> target_bus_cfg = &pcie->target_bus_cfg;
>
> - ecam_bus_mask = (pcie->ecam_size >> 20) - 1;
> + ecam_bus_mask = (pcie->ecam_size >> PCIE_ECAM_BUS_SHIFT) - 1;
> if (ecam_bus_mask > 255) {
> dev_warn(pcie->dev, "ECAM window size is larger than 256MB.
> Cutting off at 256\n");
> ecam_bus_mask = 255;
> diff --git a/drivers/pci/controller/dwc/pcie-hisi.c
> b/drivers/pci/controller/dwc/pcie-hisi.c
> index 5ca86796d43a..8fc5960faf28 100644
> --- a/drivers/pci/controller/dwc/pcie-hisi.c
> +++ b/drivers/pci/controller/dwc/pcie-hisi.c
> @@ -100,7 +100,6 @@ static int hisi_pcie_init(struct pci_config_window *cfg)
> }
>
> const struct pci_ecam_ops hisi_pcie_ops = {
> - .bus_shift = 20,
> .init = hisi_pcie_init,
> .pci_ops = {
> .map_bus = hisi_pcie_map_bus,
> @@ -135,7 +134,6 @@ static int hisi_pcie_platform_init(struct
> pci_config_window *cfg)
> }
>
> static const struct pci_ecam_ops hisi_pcie_platform_ops = {
> - .bus_shift = 20,
> .init = hisi_pcie_platform_init,
> .pci_ops = {
> .map_bus = hisi_pcie_map_bus,
> diff --git a/drivers/pci/controller/pci-aardvark.c
> b/drivers/pci/controller/pci-aardvark.c
> index 0be485a25327..1043e54c73bd 100644
> --- a/drivers/pci/controller/pci-aardvark.c
> +++ b/drivers/pci/controller/pci-aardvark.c
> @@ -16,6 +16,7 @@
> #include <linux/kernel.h>
> #include <linux/module.h>
> #include <linux/pci.h>
> +#include <linux/pci-ecam.h>
> #include <linux/init.h>
> #include <linux/phy/phy.h>
> #include <linux/platform_device.h>
> @@ -164,14 +165,6 @@
> #define PCIE_CONFIG_WR_TYPE0 0xa
> #define PCIE_CONFIG_WR_TYPE1 0xb
>
> -#define PCIE_CONF_BUS(bus) (((bus) & 0xff) << 20)
> -#define PCIE_CONF_DEV(dev) (((dev) & 0x1f) << 15)
> -#define PCIE_CONF_FUNC(fun) (((fun) & 0x7) << 12)
> -#define PCIE_CONF_REG(reg) ((reg) & 0xffc)
> -#define PCIE_CONF_ADDR(bus, devfn, where) \
> - (PCIE_CONF_BUS(bus) | PCIE_CONF_DEV(PCI_SLOT(devfn)) | \
> - PCIE_CONF_FUNC(PCI_FUNC(devfn)) | PCIE_CONF_REG(where))
> -
> #define PIO_RETRY_CNT 500
> #define PIO_RETRY_DELAY 2 /* 2 us*/
>
> @@ -687,7 +680,7 @@ static int advk_pcie_rd_conf(struct pci_bus *bus, u32
> devfn,
> advk_writel(pcie, reg, PIO_CTRL);
>
> /* Program the address registers */
> - reg = PCIE_CONF_ADDR(bus->number, devfn, where);
> + reg = ALIGN_DOWN(PCIE_ECAM_OFFSET(bus->number, devfn, where), 4);
> advk_writel(pcie, reg, PIO_ADDR_LS);
> advk_writel(pcie, 0, PIO_ADDR_MS);
>
> @@ -748,7 +741,7 @@ static int advk_pcie_wr_conf(struct pci_bus *bus, u32
> devfn,
> advk_writel(pcie, reg, PIO_CTRL);
>
> /* Program the address registers */
> - reg = PCIE_CONF_ADDR(bus->number, devfn, where);
> + reg = ALIGN_DOWN(PCIE_ECAM_OFFSET(bus->number, devfn, where), 4);
> advk_writel(pcie, reg, PIO_ADDR_LS);
> advk_writel(pcie, 0, PIO_ADDR_MS);
>
> diff --git a/drivers/pci/controller/pci-host-generic.c
> b/drivers/pci/controller/pci-host-generic.c
> index b51977abfdf1..63865aeb636b 100644
> --- a/drivers/pci/controller/pci-host-generic.c
> +++ b/drivers/pci/controller/pci-host-generic.c
> @@ -49,7 +49,6 @@ static void __iomem *pci_dw_ecam_map_bus(struct pci_bus
> *bus,
> }
>
> static const struct pci_ecam_ops pci_dw_ecam_bus_ops = {
> - .bus_shift = 20,
> .pci_ops = {
> .map_bus = pci_dw_ecam_map_bus,
> .read = pci_generic_config_read,
> diff --git a/drivers/pci/controller/pci-thunder-ecam.c
> b/drivers/pci/controller/pci-thunder-ecam.c
> index 7e8835fee5f7..f964fd26f7e0 100644
> --- a/drivers/pci/controller/pci-thunder-ecam.c
> +++ b/drivers/pci/controller/pci-thunder-ecam.c
> @@ -346,7 +346,6 @@ static int thunder_ecam_config_write(struct pci_bus *bus,
> unsigned int devfn,
> }
>
> const struct pci_ecam_ops pci_thunder_ecam_ops = {
> - .bus_shift = 20,
> .pci_ops = {
> .map_bus = pci_ecam_map_bus,
> .read = thunder_ecam_config_read,
> diff --git a/drivers/pci/controller/pcie-brcmstb.c
> b/drivers/pci/controller/pcie-brcmstb.c
> index bea86899bd5d..7fc80fd6f13f 100644
> --- a/drivers/pci/controller/pcie-brcmstb.c
> +++ b/drivers/pci/controller/pcie-brcmstb.c
> @@ -22,6 +22,7 @@
> #include <linux/of_pci.h>
> #include <linux/of_platform.h>
> #include <linux/pci.h>
> +#include <linux/pci-ecam.h>
> #include <linux/printk.h>
> #include <linux/reset.h>
> #include <linux/sizes.h>
> @@ -127,11 +128,7 @@
> #define MSI_INT_MASK_CLR 0x14
>
> #define PCIE_EXT_CFG_DATA 0x8000
> -
> #define PCIE_EXT_CFG_INDEX 0x9000
> -#define PCIE_EXT_BUSNUM_SHIFT 20
> -#define PCIE_EXT_SLOT_SHIFT 15
> -#define PCIE_EXT_FUNC_SHIFT 12
>
> #define PCIE_RGR1_SW_INIT_1_PERST_MASK 0x1
> #define PCIE_RGR1_SW_INIT_1_PERST_SHIFT 0x0
> @@ -695,15 +692,6 @@ static bool brcm_pcie_link_up(struct brcm_pcie *pcie)
> return dla && plu;
> }
>
> -/* Configuration space read/write support */
> -static inline int brcm_pcie_cfg_index(int busnr, int devfn, int reg)
> -{
> - return ((PCI_SLOT(devfn) & 0x1f) << PCIE_EXT_SLOT_SHIFT)
> - | ((PCI_FUNC(devfn) & 0x07) << PCIE_EXT_FUNC_SHIFT)
> - | (busnr << PCIE_EXT_BUSNUM_SHIFT)
> - | (reg & ~3);
> -}
> -
> static void __iomem *brcm_pcie_map_conf(struct pci_bus *bus, unsigned int
> devfn,
> int where)
> {
> @@ -716,7 +704,7 @@ static void __iomem *brcm_pcie_map_conf(struct pci_bus
> *bus, unsigned int devfn,
> return PCI_SLOT(devfn) ? NULL : base + where;
>
> /* For devices, write to the config space index register */
> - idx = brcm_pcie_cfg_index(bus->number, devfn, 0);
> + idx = PCIE_ECAM_OFFSET(bus->number, devfn, 0);
> writel(idx, pcie->base + PCIE_EXT_CFG_INDEX);
> return base + PCIE_EXT_CFG_DATA + where;
> }
> diff --git a/drivers/pci/controller/pcie-rockchip-host.c
> b/drivers/pci/controller/pcie-rockchip-host.c
> index 9705059523a6..f1d08a1b1591 100644
> --- a/drivers/pci/controller/pcie-rockchip-host.c
> +++ b/drivers/pci/controller/pcie-rockchip-host.c
> @@ -157,12 +157,11 @@ static int rockchip_pcie_rd_other_conf(struct
> rockchip_pcie *rockchip,
> struct pci_bus *bus, u32 devfn,
> int where, int size, u32 *val)
> {
> - u32 busdev;
> + void __iomem *addr;
>
> - busdev = PCIE_ECAM_ADDR(bus->number, PCI_SLOT(devfn),
> - PCI_FUNC(devfn), where);
> + addr = rockchip->reg_base + PCIE_ECAM_OFFSET(bus->number, devfn, where);
>
> - if (!IS_ALIGNED(busdev, size)) {
> + if (!IS_ALIGNED((uintptr_t)addr, size)) {
> *val = 0;
> return PCIBIOS_BAD_REGISTER_NUMBER;
> }
> @@ -175,11 +174,11 @@ static int rockchip_pcie_rd_other_conf(struct
> rockchip_pcie *rockchip,
> AXI_WRAPPER_TYPE1_CFG);
>
> if (size == 4) {
> - *val = readl(rockchip->reg_base + busdev);
> + *val = readl(addr);
> } else if (size == 2) {
> - *val = readw(rockchip->reg_base + busdev);
> + *val = readw(addr);
> } else if (size == 1) {
> - *val = readb(rockchip->reg_base + busdev);
> + *val = readb(addr);
> } else {
> *val = 0;
> return PCIBIOS_BAD_REGISTER_NUMBER;
> @@ -191,11 +190,11 @@ static int rockchip_pcie_wr_other_conf(struct
> rockchip_pcie *rockchip,
> struct pci_bus *bus, u32 devfn,
> int where, int size, u32 val)
> {
> - u32 busdev;
> + void __iomem *addr;
>
> - busdev = PCIE_ECAM_ADDR(bus->number, PCI_SLOT(devfn),
> - PCI_FUNC(devfn), where);
> - if (!IS_ALIGNED(busdev, size))
> + addr = rockchip->reg_base + PCIE_ECAM_OFFSET(bus->number, devfn, where);
> +
> + if (!IS_ALIGNED((uintptr_t)addr, size))
> return PCIBIOS_BAD_REGISTER_NUMBER;
>
> if (pci_is_root_bus(bus->parent))
> @@ -206,11 +205,11 @@ static int rockchip_pcie_wr_other_conf(struct
> rockchip_pcie *rockchip,
> AXI_WRAPPER_TYPE1_CFG);
>
> if (size == 4)
> - writel(val, rockchip->reg_base + busdev);
> + writel(val, addr);
> else if (size == 2)
> - writew(val, rockchip->reg_base + busdev);
> + writew(val, addr);
> else if (size == 1)
> - writeb(val, rockchip->reg_base + busdev);
> + writeb(val, addr);
> else
> return PCIBIOS_BAD_REGISTER_NUMBER;
>
> diff --git a/drivers/pci/controller/pcie-rockchip.h
> b/drivers/pci/controller/pcie-rockchip.h
> index c7d0178fc8c2..1650a5087450 100644
> --- a/drivers/pci/controller/pcie-rockchip.h
> +++ b/drivers/pci/controller/pcie-rockchip.h
> @@ -13,6 +13,7 @@
>
> #include <linux/kernel.h>
> #include <linux/pci.h>
> +#include <linux/pci-ecam.h>
>
> /*
> * The upper 16 bits of PCIE_CLIENT_CONFIG are a write mask for the lower 16
> @@ -178,13 +179,6 @@
> #define MIN_AXI_ADDR_BITS_PASSED 8
> #define PCIE_RC_SEND_PME_OFF 0x11960
> #define ROCKCHIP_VENDOR_ID 0x1d87
> -#define PCIE_ECAM_BUS(x) (((x) & 0xff) << 20)
> -#define PCIE_ECAM_DEV(x) (((x) & 0x1f) << 15)
> -#define PCIE_ECAM_FUNC(x) (((x) & 0x7) << 12)
> -#define PCIE_ECAM_REG(x) (((x) & 0xfff) << 0)
> -#define PCIE_ECAM_ADDR(bus, dev, func, reg) \
> - (PCIE_ECAM_BUS(bus) | PCIE_ECAM_DEV(dev) | \
> - PCIE_ECAM_FUNC(func) | PCIE_ECAM_REG(reg))
> #define PCIE_LINK_IS_L2(x) \
> (((x) & PCIE_CLIENT_DEBUG_LTSSM_MASK) == PCIE_CLIENT_DEBUG_LTSSM_L2)
> #define PCIE_LINK_UP(x) \
> diff --git a/drivers/pci/controller/pcie-tango.c
> b/drivers/pci/controller/pcie-tango.c
> index d093a8ce4bb1..62a061f1d62e 100644
> --- a/drivers/pci/controller/pcie-tango.c
> +++ b/drivers/pci/controller/pcie-tango.c
> @@ -208,7 +208,6 @@ static int smp8759_config_write(struct pci_bus *bus,
> unsigned int devfn,
> }
>
> static const struct pci_ecam_ops smp8759_ecam_ops = {
> - .bus_shift = 20,
> .pci_ops = {
> .map_bus = pci_ecam_map_bus,
> .read = smp8759_config_read,
> diff --git a/drivers/pci/controller/pcie-xilinx-nwl.c
> b/drivers/pci/controller/pcie-xilinx-nwl.c
> index f3cf7d61924f..7f29c2fdcd51 100644
> --- a/drivers/pci/controller/pcie-xilinx-nwl.c
> +++ b/drivers/pci/controller/pcie-xilinx-nwl.c
> @@ -18,6 +18,7 @@
> #include <linux/of_platform.h>
> #include <linux/of_irq.h>
> #include <linux/pci.h>
> +#include <linux/pci-ecam.h>
> #include <linux/platform_device.h>
> #include <linux/irqchip/chained_irq.h>
>
> @@ -124,8 +125,6 @@
> #define E_ECAM_CR_ENABLE BIT(0)
> #define E_ECAM_SIZE_LOC GENMASK(20, 16)
> #define E_ECAM_SIZE_SHIFT 16
> -#define ECAM_BUS_LOC_SHIFT 20
> -#define ECAM_DEV_LOC_SHIFT 12
> #define NWL_ECAM_VALUE_DEFAULT 12
>
> #define CFG_DMA_REG_BAR GENMASK(2, 0)
> @@ -240,15 +239,11 @@ static void __iomem *nwl_pcie_map_bus(struct pci_bus
> *bus, unsigned int devfn,
> int where)
> {
> struct nwl_pcie *pcie = bus->sysdata;
> - int relbus;
>
> if (!nwl_pcie_valid_device(bus, devfn))
> return NULL;
>
> - relbus = (bus->number << ECAM_BUS_LOC_SHIFT) |
> - (devfn << ECAM_DEV_LOC_SHIFT);
> -
> - return pcie->ecam_base + relbus + where;
> + return pcie->ecam_base + PCIE_ECAM_OFFSET(bus->number, devfn, where);
> }
>
> /* PCIe operations */
> diff --git a/drivers/pci/controller/pcie-xilinx.c
> b/drivers/pci/controller/pcie-xilinx.c
> index 8523be61bba5..fa5baeb82653 100644
> --- a/drivers/pci/controller/pcie-xilinx.c
> +++ b/drivers/pci/controller/pcie-xilinx.c
> @@ -21,6 +21,7 @@
> #include <linux/of_platform.h>
> #include <linux/of_irq.h>
> #include <linux/pci.h>
> +#include <linux/pci-ecam.h>
> #include <linux/platform_device.h>
>
> #include "../pci.h"
> @@ -86,10 +87,6 @@
> /* Phy Status/Control Register definitions */
> #define XILINX_PCIE_REG_PSCR_LNKUP BIT(11)
>
> -/* ECAM definitions */
> -#define ECAM_BUS_NUM_SHIFT 20
> -#define ECAM_DEV_NUM_SHIFT 12
> -
> /* Number of MSI IRQs */
> #define XILINX_NUM_MSI_IRQS 128
>
> @@ -183,15 +180,11 @@ static void __iomem *xilinx_pcie_map_bus(struct pci_bus
> *bus,
> unsigned int devfn, int where)
> {
> struct xilinx_pcie_port *port = bus->sysdata;
> - int relbus;
>
> if (!xilinx_pcie_valid_device(bus, devfn))
> return NULL;
>
> - relbus = (bus->number << ECAM_BUS_NUM_SHIFT) |
> - (devfn << ECAM_DEV_NUM_SHIFT);
> -
> - return port->reg_base + relbus + where;
> + return port->reg_base + PCIE_ECAM_OFFSET(bus->number, devfn, where);
> }
>
> /* PCIe operations */
> diff --git a/drivers/pci/controller/vmd.c b/drivers/pci/controller/vmd.c
> index f375c21ceeb1..1361a79bd1e7 100644
> --- a/drivers/pci/controller/vmd.c
> +++ b/drivers/pci/controller/vmd.c
> @@ -11,6 +11,7 @@
> #include <linux/module.h>
> #include <linux/msi.h>
> #include <linux/pci.h>
> +#include <linux/pci-ecam.h>
> #include <linux/srcu.h>
> #include <linux/rculist.h>
> #include <linux/rcupdate.h>
> @@ -328,15 +329,13 @@ static void vmd_remove_irq_domain(struct vmd_dev *vmd)
> static char __iomem *vmd_cfg_addr(struct vmd_dev *vmd, struct pci_bus *bus,
> unsigned int devfn, int reg, int len)
> {
> - char __iomem *addr = vmd->cfgbar +
> - ((bus->number - vmd->busn_start) << 20) +
> - (devfn << 12) + reg;
> + unsigned int busnr_ecam = bus->number - vmd->busn_start;
> + u32 offset = PCIE_ECAM_OFFSET(busnr_ecam, devfn, reg);
>
> - if ((addr - vmd->cfgbar) + len >=
> - resource_size(&vmd->dev->resource[VMD_CFGBAR]))
> + if (offset + len >= resource_size(&vmd->dev->resource[VMD_CFGBAR]))
> return NULL;
>
> - return addr;
> + return vmd->cfgbar + offset;
> }
>
For vmd.c:
Reviewed-by: Jon Derrick <jonathan.derr...@intel.com>
Thanks
> /*
> diff --git a/drivers/pci/ecam.c b/drivers/pci/ecam.c
> index b54d32a31669..59f91d434859 100644
> --- a/drivers/pci/ecam.c
> +++ b/drivers/pci/ecam.c
> @@ -131,25 +131,36 @@ void __iomem *pci_ecam_map_bus(struct pci_bus *bus,
> unsigned int devfn,
> int where)
> {
> struct pci_config_window *cfg = bus->sysdata;
> + unsigned int bus_shift = cfg->ops->bus_shift;
> unsigned int devfn_shift = cfg->ops->bus_shift - 8;
> unsigned int busn = bus->number;
> void __iomem *base;
> + u32 bus_offset, devfn_offset;
>
> if (busn < cfg->busr.start || busn > cfg->busr.end)
> return NULL;
>
> busn -= cfg->busr.start;
> - if (per_bus_mapping)
> + if (per_bus_mapping) {
> base = cfg->winp[busn];
> - else
> - base = cfg->win + (busn << cfg->ops->bus_shift);
> - return base + (devfn << devfn_shift) + where;
> + busn = 0;
> + } else
> + base = cfg->win;
> +
> + if (cfg->ops->bus_shift) {
> + bus_offset = (busn & PCIE_ECAM_BUS_MASK) << bus_shift;
> + devfn_offset = (devfn & PCIE_ECAM_DEVFN_MASK) << devfn_shift;
> + where &= PCIE_ECAM_REG_MASK;
> +
> + return base + (bus_offset | devfn_offset | where);
> + }
> +
> + return base + PCIE_ECAM_OFFSET(busn, devfn, where);
> }
> EXPORT_SYMBOL_GPL(pci_ecam_map_bus);
>
> /* ECAM ops */
> const struct pci_ecam_ops pci_generic_ecam_ops = {
> - .bus_shift = 20,
> .pci_ops = {
> .map_bus = pci_ecam_map_bus,
> .read = pci_generic_config_read,
> @@ -161,7 +172,6 @@ EXPORT_SYMBOL_GPL(pci_generic_ecam_ops);
> #if defined(CONFIG_ACPI) && defined(CONFIG_PCI_QUIRKS)
> /* ECAM ops for 32-bit access only (non-compliant) */
> const struct pci_ecam_ops pci_32b_ops = {
> - .bus_shift = 20,
> .pci_ops = {
> .map_bus = pci_ecam_map_bus,
> .read = pci_generic_config_read32,
> @@ -171,7 +181,6 @@ const struct pci_ecam_ops pci_32b_ops = {
>
> /* ECAM ops for 32-bit read only (non-compliant) */
> const struct pci_ecam_ops pci_32b_read_ops = {
> - .bus_shift = 20,
> .pci_ops = {
> .map_bus = pci_ecam_map_bus,
> .read = pci_generic_config_read32,
> diff --git a/include/linux/pci-ecam.h b/include/linux/pci-ecam.h
> index 033ce74f02e8..65d3d83015c3 100644
> --- a/include/linux/pci-ecam.h
> +++ b/include/linux/pci-ecam.h
> @@ -9,6 +9,33 @@
> #include <linux/kernel.h>
> #include <linux/platform_device.h>
>
> +/*
> + * Memory address shift values for the byte-level address that
> + * can be used when accessing the PCI Express Configuration Space.
> + */
> +
> +/*
> + * Enhanced Configuration Access Mechanism (ECAM)
> + *
> + * See PCI Express Base Specification, Revision 5.0, Version 1.0,
> + * Section 7.2.2, Table 7-1, p. 677.
> + */
> +#define PCIE_ECAM_BUS_SHIFT 20 /* Bus number */
> +#define PCIE_ECAM_DEVFN_SHIFT 12 /* Device and Function number */
> +
> +#define PCIE_ECAM_BUS_MASK 0xff
> +#define PCIE_ECAM_DEVFN_MASK 0xff
> +#define PCIE_ECAM_REG_MASK 0xfff /* Limit offset to a maximum of 4K */
> +
> +#define PCIE_ECAM_BUS(x) (((x) & PCIE_ECAM_BUS_MASK) <<
> PCIE_ECAM_BUS_SHIFT)
> +#define PCIE_ECAM_DEVFN(x) (((x) & PCIE_ECAM_DEVFN_MASK) <<
> PCIE_ECAM_DEVFN_SHIFT)
> +#define PCIE_ECAM_REG(x) ((x) & PCIE_ECAM_REG_MASK)
> +
> +#define PCIE_ECAM_OFFSET(bus, devfn, where) \
> + (PCIE_ECAM_BUS(bus) | \
> + PCIE_ECAM_DEVFN(devfn) | \
> + PCIE_ECAM_REG(where))
> +
> /*
> * struct to hold pci ops and bus shift of the config window
> * for a PCI controller.
