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PCI: Unify ECAM constants in native PCI Express drivers

Browse Source 
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_shift" 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.

Thanks to Qian Cai <qcai@redhat.com>, Michael Walle <michael@walle.cc>,
and Vladimir Oltean <olteanv@gmail.com> for reporting a pci_ecam_create()
issue with .bus_shift and to Vladimir for proposing the fix.

[bhelgaas: incorporate Vladimir's fix, update commit log]
Suggested-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://lore.kernel.org/r/20201129230743.3006978-2-kw@linux.com
Tested-by: Michael Walle <michael@walle.cc>
Signed-off-by: Krzysztof Wilczyński <kw@linux.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Jon Derrick <jonathan.derrick@intel.com>
Reviewed-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Krzysztof Wilczyński 2020-11-29 23:07:39 +00:00 committed by Bjorn Helgaas
parent f8394f232b
commit e7708f5b10
14 changed files with 80 additions and 91 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/pci/controller/dwc/pcie-al.c
View File

@ -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;

2
drivers/pci/controller/dwc/pcie-hisi.c
View File

@ -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,

13
drivers/pci/controller/pci-aardvark.c
View File

@ -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);

1
drivers/pci/controller/pci-host-generic.c
View File

@ -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,

1
drivers/pci/controller/pci-thunder-ecam.c
View File

@ -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,

16
drivers/pci/controller/pcie-brcmstb.c
View File

@ -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;
}

27
drivers/pci/controller/pcie-rockchip-host.c
View File

@ -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;

8
drivers/pci/controller/pcie-rockchip.h
View File

@ -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) \

1
drivers/pci/controller/pcie-tango.c
View File

@ -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,

9
drivers/pci/controller/pcie-xilinx-nwl.c
View File

@ -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 */

11
drivers/pci/controller/pcie-xilinx.c
View File

@ -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 */

11
drivers/pci/controller/vmd.c
View File

@ -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;
}
/*

32
drivers/pci/ecam.c
View File

@ -28,6 +28,7 @@ struct pci_config_window *pci_ecam_create(struct device *dev,
struct resource *cfgres, struct resource *busr,
const struct pci_ecam_ops *ops)
{
unsigned int bus_shift = ops->bus_shift;
struct pci_config_window *cfg;
unsigned int bus_range, bus_range_max, bsz;
struct resource *conflict;
@ -40,20 +41,24 @@ struct pci_config_window *pci_ecam_create(struct device *dev,
if (!cfg)
return ERR_PTR(-ENOMEM);
/* ECAM-compliant platforms need not supply ops->bus_shift */
if (!bus_shift)
bus_shift = PCIE_ECAM_BUS_SHIFT;
cfg->parent = dev;
cfg->ops = ops;
cfg->busr.start = busr->start;
cfg->busr.end = busr->end;
cfg->busr.flags = IORESOURCE_BUS;
bus_range = resource_size(&cfg->busr);
bus_range_max = resource_size(cfgres) >> ops->bus_shift;
bus_range_max = resource_size(cfgres) >> bus_shift;
if (bus_range > bus_range_max) {
bus_range = bus_range_max;
cfg->busr.end = busr->start + bus_range - 1;
dev_warn(dev, "ECAM area %pR can only accommodate %pR (reduced from %pR desired)\n",
cfgres, &cfg->busr, busr);
}
bsz = 1 << ops->bus_shift;
bsz = 1 << bus_shift;
cfg->res.start = cfgres->start;
cfg->res.end = cfgres->end;
@ -131,25 +136,36 @@ 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 +177,6 @@ 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 +186,6 @@ 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,

27
include/linux/pci-ecam.h
View File

@ -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.