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Merge branch 'pci/errors'

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- Add PCI_ERROR_RESPONSE and related definitions for signaling and checking
  for transaction errors on PCI (Naveen Naidu)

- Fabricate PCI_ERROR_RESPONSE data (~0) in config read wrappers, instead
  of in host controller drivers, when transactions fail on PCI (Naveen
  Naidu)

- Use PCI_POSSIBLE_ERROR() to check for possible failure of config reads
  (Naveen Naidu)

* pci/errors:
  PCI: xgene: Use PCI_ERROR_RESPONSE to identify config read errors
  PCI: hv: Use PCI_ERROR_RESPONSE to identify config read errors
  PCI: keystone: Use PCI_ERROR_RESPONSE to identify config read errors
  PCI: Use PCI_ERROR_RESPONSE to identify config read errors
  PCI: cpqphp: Use PCI_POSSIBLE_ERROR() to check config reads
  PCI/PME: Use PCI_POSSIBLE_ERROR() to check config reads
  PCI/DPC: Use PCI_POSSIBLE_ERROR() to check config reads
  PCI: pciehp: Use PCI_POSSIBLE_ERROR() to check config reads
  PCI: vmd: Use PCI_POSSIBLE_ERROR() to check config reads
  PCI/ERR: Use PCI_POSSIBLE_ERROR() to check config reads
  PCI: rockchip-host: Drop error data fabrication when config read fails
  PCI: rcar-host: Drop error data fabrication when config read fails
  PCI: altera: Drop error data fabrication when config read fails
  PCI: mvebu: Drop error data fabrication when config read fails
  PCI: aardvark: Drop error data fabrication when config read fails
  PCI: kirin: Drop error data fabrication when config read fails
  PCI: histb: Drop error data fabrication when config read fails
  PCI: exynos: Drop error data fabrication when config read fails
  PCI: mediatek: Drop error data fabrication when config read fails
  PCI: iproc: Drop error data fabrication when config read fails
  PCI: thunder: Drop error data fabrication when config read fails
  PCI: Drop error data fabrication when config read fails
  PCI: Use PCI_SET_ERROR_RESPONSE() for disconnected devices
  PCI: Set error response data when config read fails
  PCI: Add PCI_ERROR_RESPONSE and related definitions
This commit is contained in:
Bjorn Helgaas 2022-01-13 09:57:52 -06:00
commit f5d3ca6fff
24 changed files with 88 additions and 120 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

36
drivers/pci/access.c
View File

@ -42,7 +42,10 @@ int noinline pci_bus_read_config_##size \
if (PCI_##size##_BAD) return PCIBIOS_BAD_REGISTER_NUMBER; \
pci_lock_config(flags); \
res = bus->ops->read(bus, devfn, pos, len, &data); \
*value = (type)data; \
if (res) \
PCI_SET_ERROR_RESPONSE(value); \
else \
*value = (type)data; \
pci_unlock_config(flags); \
return res; \
}
@ -80,10 +83,8 @@ int pci_generic_config_read(struct pci_bus *bus, unsigned int devfn,
void __iomem *addr;
addr = bus->ops->map_bus(bus, devfn, where);
if (!addr) {
*val = ~0;
if (!addr)
return PCIBIOS_DEVICE_NOT_FOUND;
}
if (size == 1)
*val = readb(addr);
@ -122,10 +123,8 @@ int pci_generic_config_read32(struct pci_bus *bus, unsigned int devfn,
void __iomem *addr;
addr = bus->ops->map_bus(bus, devfn, where & ~0x3);
if (!addr) {
*val = ~0;
if (!addr)
return PCIBIOS_DEVICE_NOT_FOUND;
}
*val = readl(addr);
@ -228,7 +227,10 @@ int pci_user_read_config_##size \
ret = dev->bus->ops->read(dev->bus, dev->devfn, \
pos, sizeof(type), &data); \
raw_spin_unlock_irq(&pci_lock); \
*val = (type)data; \
if (ret) \
PCI_SET_ERROR_RESPONSE(val); \
else \
*val = (type)data; \
return pcibios_err_to_errno(ret); \
} \
EXPORT_SYMBOL_GPL(pci_user_read_config_##size);
@ -410,9 +412,9 @@ int pcie_capability_read_word(struct pci_dev *dev, int pos, u16 *val)
if (pcie_capability_reg_implemented(dev, pos)) {
ret = pci_read_config_word(dev, pci_pcie_cap(dev) + pos, val);
/*
* Reset *val to 0 if pci_read_config_word() fails, it may
* have been written as 0xFFFF if hardware error happens
* during pci_read_config_word().
* Reset *val to 0 if pci_read_config_word() fails; it may
* have been written as 0xFFFF (PCI_ERROR_RESPONSE) if the
* config read failed on PCI.
*/
if (ret)
*val = 0;
@ -445,9 +447,9 @@ int pcie_capability_read_dword(struct pci_dev *dev, int pos, u32 *val)
if (pcie_capability_reg_implemented(dev, pos)) {
ret = pci_read_config_dword(dev, pci_pcie_cap(dev) + pos, val);
/*
* Reset *val to 0 if pci_read_config_dword() fails, it may
* have been written as 0xFFFFFFFF if hardware error happens
* during pci_read_config_dword().
* Reset *val to 0 if pci_read_config_dword() fails; it may
* have been written as 0xFFFFFFFF (PCI_ERROR_RESPONSE) if
* the config read failed on PCI.
*/
if (ret)
*val = 0;
@ -523,7 +525,7 @@ EXPORT_SYMBOL(pcie_capability_clear_and_set_dword);
int pci_read_config_byte(const struct pci_dev *dev, int where, u8 *val)
{
if (pci_dev_is_disconnected(dev)) {
*val = ~0;
PCI_SET_ERROR_RESPONSE(val);
return PCIBIOS_DEVICE_NOT_FOUND;
}
return pci_bus_read_config_byte(dev->bus, dev->devfn, where, val);
@ -533,7 +535,7 @@ EXPORT_SYMBOL(pci_read_config_byte);
int pci_read_config_word(const struct pci_dev *dev, int where, u16 *val)
{
if (pci_dev_is_disconnected(dev)) {
*val = ~0;
PCI_SET_ERROR_RESPONSE(val);
return PCIBIOS_DEVICE_NOT_FOUND;
}
return pci_bus_read_config_word(dev->bus, dev->devfn, where, val);
@ -544,7 +546,7 @@ int pci_read_config_dword(const struct pci_dev *dev, int where,
u32 *val)
{
if (pci_dev_is_disconnected(dev)) {
*val = ~0;
PCI_SET_ERROR_RESPONSE(val);
return PCIBIOS_DEVICE_NOT_FOUND;
}
return pci_bus_read_config_dword(dev->bus, dev->devfn, where, val);

4
drivers/pci/controller/dwc/pci-exynos.c
View File

@ -216,10 +216,8 @@ static int exynos_pcie_rd_own_conf(struct pci_bus *bus, unsigned int devfn,
{
struct dw_pcie *pci = to_dw_pcie_from_pp(bus->sysdata);
if (PCI_SLOT(devfn)) {
*val = ~0;
if (PCI_SLOT(devfn))
return PCIBIOS_DEVICE_NOT_FOUND;
}
*val = dw_pcie_read_dbi(pci, where, size);
return PCIBIOS_SUCCESSFUL;

6
drivers/pci/controller/dwc/pci-keystone.c
View File

@ -747,9 +747,9 @@ err:
#ifdef CONFIG_ARM
/*
* When a PCI device does not exist during config cycles, keystone host gets a
* bus error instead of returning 0xffffffff. This handler always returns 0
* for this kind of faults.
* When a PCI device does not exist during config cycles, keystone host
* gets a bus error instead of returning 0xffffffff (PCI_ERROR_RESPONSE).
* This handler always returns 0 for this kind of fault.
*/
static int ks_pcie_fault(unsigned long addr, unsigned int fsr,
struct pt_regs *regs)

4
drivers/pci/controller/dwc/pcie-histb.c
View File

@ -127,10 +127,8 @@ static int histb_pcie_rd_own_conf(struct pci_bus *bus, unsigned int devfn,
{
struct dw_pcie *pci = to_dw_pcie_from_pp(bus->sysdata);
if (PCI_SLOT(devfn)) {
*val = ~0;
if (PCI_SLOT(devfn))
return PCIBIOS_DEVICE_NOT_FOUND;
}
*val = dw_pcie_read_dbi(pci, where, size);
return PCIBIOS_SUCCESSFUL;

4
drivers/pci/controller/dwc/pcie-kirin.c
View File

@ -530,10 +530,8 @@ static int kirin_pcie_rd_own_conf(struct pci_bus *bus, unsigned int devfn,
{
struct dw_pcie *pci = to_dw_pcie_from_pp(bus->sysdata);
if (PCI_SLOT(devfn)) {
*val = ~0;
if (PCI_SLOT(devfn))
return PCIBIOS_DEVICE_NOT_FOUND;
}
*val = dw_pcie_read_dbi(pci, where, size);
return PCIBIOS_SUCCESSFUL;

4
drivers/pci/controller/pci-aardvark.c
View File

@ -1037,10 +1037,8 @@ static int advk_pcie_rd_conf(struct pci_bus *bus, u32 devfn,
u32 reg;
int ret;
if (!advk_pcie_valid_device(pcie, bus, devfn)) {
*val = 0xffffffff;
if (!advk_pcie_valid_device(pcie, bus, devfn))
return PCIBIOS_DEVICE_NOT_FOUND;
}
if (pci_is_root_bus(bus))
return pci_bridge_emul_conf_read(&pcie->bridge, where,

2
drivers/pci/controller/pci-hyperv.c
View File

@ -2030,7 +2030,7 @@ static void prepopulate_bars(struct hv_pcibus_device *hbus)
* If the memory enable bit is already set, Hyper-V silently ignores
* the below BAR updates, and the related PCI device driver can not
* work, because reading from the device register(s) always returns
* 0xFFFFFFFF.
* 0xFFFFFFFF (PCI_ERROR_RESPONSE).
*/
list_for_each_entry(hpdev, &hbus->children, list_entry) {
_hv_pcifront_read_config(hpdev, PCI_COMMAND, 2, &command);

8
drivers/pci/controller/pci-mvebu.c
View File

@ -814,20 +814,16 @@ static int mvebu_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
int ret;
port = mvebu_pcie_find_port(pcie, bus, devfn);
if (!port) {
*val = 0xffffffff;
if (!port)
return PCIBIOS_DEVICE_NOT_FOUND;
}
/* Access the emulated PCI-to-PCI bridge */
if (bus->number == 0)
return pci_bridge_emul_conf_read(&port->bridge, where,
size, val);
if (!mvebu_pcie_link_up(port)) {
*val = 0xffffffff;
if (!mvebu_pcie_link_up(port))
return PCIBIOS_DEVICE_NOT_FOUND;
}
/* Access the real PCIe interface */
ret = mvebu_pcie_hw_rd_conf(port, bus, devfn,

46
drivers/pci/controller/pci-thunder-ecam.c
View File

@ -41,10 +41,9 @@ static int handle_ea_bar(u32 e0, int bar, struct pci_bus *bus,
}
if (where_a == 0x4) {
addr = bus->ops->map_bus(bus, devfn, bar); /* BAR 0 */
if (!addr) {
*val = ~0;
if (!addr)
return PCIBIOS_DEVICE_NOT_FOUND;
}
v = readl(addr);
v &= ~0xf;
v |= 2; /* EA entry-1. Base-L */
@ -56,10 +55,9 @@ static int handle_ea_bar(u32 e0, int bar, struct pci_bus *bus,
u32 barl_rb;
addr = bus->ops->map_bus(bus, devfn, bar); /* BAR 0 */
if (!addr) {
*val = ~0;
if (!addr)
return PCIBIOS_DEVICE_NOT_FOUND;
}
barl_orig = readl(addr + 0);
writel(0xffffffff, addr + 0);
barl_rb = readl(addr + 0);
@ -72,10 +70,9 @@ static int handle_ea_bar(u32 e0, int bar, struct pci_bus *bus,
}
if (where_a == 0xc) {
addr = bus->ops->map_bus(bus, devfn, bar + 4); /* BAR 1 */
if (!addr) {
*val = ~0;
if (!addr)
return PCIBIOS_DEVICE_NOT_FOUND;
}
v = readl(addr); /* EA entry-3. Base-H */
set_val(v, where, size, val);
return PCIBIOS_SUCCESSFUL;
@ -104,10 +101,8 @@ static int thunder_ecam_p2_config_read(struct pci_bus *bus, unsigned int devfn,
}
addr = bus->ops->map_bus(bus, devfn, where_a);
if (!addr) {
*val = ~0;
if (!addr)
return PCIBIOS_DEVICE_NOT_FOUND;
}
v = readl(addr);
@ -135,10 +130,8 @@ static int thunder_ecam_config_read(struct pci_bus *bus, unsigned int devfn,
int where_a = where & ~3;
addr = bus->ops->map_bus(bus, devfn, 0xc);
if (!addr) {
*val = ~0;
if (!addr)
return PCIBIOS_DEVICE_NOT_FOUND;
}
v = readl(addr);
@ -146,10 +139,8 @@ static int thunder_ecam_config_read(struct pci_bus *bus, unsigned int devfn,
cfg_type = (v >> 16) & 0x7f;
addr = bus->ops->map_bus(bus, devfn, 8);
if (!addr) {
*val = ~0;
if (!addr)
return PCIBIOS_DEVICE_NOT_FOUND;
}
class_rev = readl(addr);
if (class_rev == 0xffffffff)
@ -176,10 +167,8 @@ static int thunder_ecam_config_read(struct pci_bus *bus, unsigned int devfn,
}
addr = bus->ops->map_bus(bus, devfn, 0);
if (!addr) {
*val = ~0;
if (!addr)
return PCIBIOS_DEVICE_NOT_FOUND;
}
vendor_device = readl(addr);
if (vendor_device == 0xffffffff)
@ -196,10 +185,9 @@ static int thunder_ecam_config_read(struct pci_bus *bus, unsigned int devfn,
bool is_tns = (vendor_device == 0xa01f177d);
addr = bus->ops->map_bus(bus, devfn, 0x70);
if (!addr) {
*val = ~0;
if (!addr)
return PCIBIOS_DEVICE_NOT_FOUND;
}
/* E_CAP */
v = readl(addr);
has_msix = (v & 0xff00) != 0;
@ -211,10 +199,9 @@ static int thunder_ecam_config_read(struct pci_bus *bus, unsigned int devfn,
}
if (where_a == 0xb0) {
addr = bus->ops->map_bus(bus, devfn, where_a);
if (!addr) {
*val = ~0;
if (!addr)
return PCIBIOS_DEVICE_NOT_FOUND;
}
v = readl(addr);
if (v & 0xff00)
pr_err("Bad MSIX cap header: %08x\n", v);
@ -268,10 +255,9 @@ static int thunder_ecam_config_read(struct pci_bus *bus, unsigned int devfn,
if (where_a == 0x70) {
addr = bus->ops->map_bus(bus, devfn, where_a);
if (!addr) {
*val = ~0;
if (!addr)
return PCIBIOS_DEVICE_NOT_FOUND;
}
v = readl(addr);
if (v & 0xff00)
pr_err("Bad PCIe cap header: %08x\n", v);

4
drivers/pci/controller/pci-thunder-pem.c
View File

@ -41,10 +41,8 @@ static int thunder_pem_bridge_read(struct pci_bus *bus, unsigned int devfn,
struct pci_config_window *cfg = bus->sysdata;
struct thunder_pem_pci *pem_pci = (struct thunder_pem_pci *)cfg->priv;
if (devfn != 0 || where >= 2048) {
*val = ~0;
if (devfn != 0 || where >= 2048)
return PCIBIOS_DEVICE_NOT_FOUND;
}
/*
* 32-bit accesses only. Write the address to the low order

10
drivers/pci/controller/pci-xgene.c
View File

@ -171,11 +171,11 @@ static int xgene_pcie_config_read32(struct pci_bus *bus, unsigned int devfn,
return PCIBIOS_DEVICE_NOT_FOUND;
/*
* The v1 controller has a bug in its Configuration Request
* Retry Status (CRS) logic: when CRS Software Visibility is
* enabled and we read the Vendor and Device ID of a non-existent
* device, the controller fabricates return data of 0xFFFF0001
* ("device exists but is not ready") instead of 0xFFFFFFFF
* The v1 controller has a bug in its Configuration Request Retry
* Status (CRS) logic: when CRS Software Visibility is enabled and
* we read the Vendor and Device ID of a non-existent device, the
* controller fabricates return data of 0xFFFF0001 ("device exists
* but is not ready") instead of 0xFFFFFFFF (PCI_ERROR_RESPONSE)
* ("device does not exist"). This causes the PCI core to retry
* the read until it times out. Avoid this by not claiming to
* support CRS SV.

4
drivers/pci/controller/pcie-altera.c
View File

@ -510,10 +510,8 @@ static int altera_pcie_cfg_read(struct pci_bus *bus, unsigned int devfn,
if (altera_pcie_hide_rc_bar(bus, devfn, where))
return PCIBIOS_BAD_REGISTER_NUMBER;
if (!altera_pcie_valid_device(pcie, bus, PCI_SLOT(devfn))) {
*value = 0xffffffff;
if (!altera_pcie_valid_device(pcie, bus, PCI_SLOT(devfn)))
return PCIBIOS_DEVICE_NOT_FOUND;
}
return _altera_pcie_cfg_read(pcie, bus->number, devfn, where, size,
value);

4
drivers/pci/controller/pcie-iproc.c
View File

@ -659,10 +659,8 @@ static int iproc_pci_raw_config_read32(struct iproc_pcie *pcie,
void __iomem *addr;
addr = iproc_pcie_map_cfg_bus(pcie, 0, devfn, where & ~0x3);
if (!addr) {
*val = ~0;
if (!addr)
return PCIBIOS_DEVICE_NOT_FOUND;
}
*val = readl(addr);

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

@ -365,19 +365,12 @@ static int mtk_pcie_config_read(struct pci_bus *bus, unsigned int devfn,
{
struct mtk_pcie_port *port;
u32 bn = bus->number;
int ret;
port = mtk_pcie_find_port(bus, devfn);
if (!port) {
*val = ~0;
if (!port)
return PCIBIOS_DEVICE_NOT_FOUND;
}
ret = mtk_pcie_hw_rd_cfg(port, bn, devfn, where, size, val);
if (ret)
*val = ~0;
return ret;
return mtk_pcie_hw_rd_cfg(port, bn, devfn, where, size, val);
}
static int mtk_pcie_config_write(struct pci_bus *bus, unsigned int devfn,

4
drivers/pci/controller/pcie-rcar-host.c
View File

@ -159,10 +159,8 @@ static int rcar_pcie_read_conf(struct pci_bus *bus, unsigned int devfn,
ret = rcar_pcie_config_access(host, RCAR_PCI_ACCESS_READ,
bus, devfn, where, val);
if (ret != PCIBIOS_SUCCESSFUL) {
*val = 0xffffffff;
if (ret != PCIBIOS_SUCCESSFUL)
return ret;
}
if (size == 1)
*val = (*val >> (BITS_PER_BYTE * (where & 3))) & 0xff;

4
drivers/pci/controller/pcie-rockchip-host.c
View File

@ -221,10 +221,8 @@ static int rockchip_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
{
struct rockchip_pcie *rockchip = bus->sysdata;
if (!rockchip_pcie_valid_device(rockchip, bus, PCI_SLOT(devfn))) {
*val = 0xffffffff;
if (!rockchip_pcie_valid_device(rockchip, bus, PCI_SLOT(devfn)))
return PCIBIOS_DEVICE_NOT_FOUND;
}
if (pci_is_root_bus(bus))
return rockchip_pcie_rd_own_conf(rockchip, where, size, val);

2
drivers/pci/controller/vmd.c
View File

@ -575,7 +575,7 @@ static int vmd_get_phys_offsets(struct vmd_dev *vmd, bool native_hint,
int ret;
ret = pci_read_config_dword(dev, PCI_REG_VMLOCK, &vmlock);
if (ret || vmlock == ~0)
if (ret || PCI_POSSIBLE_ERROR(vmlock))
return -ENODEV;
if (MB2_SHADOW_EN(vmlock)) {

4
drivers/pci/hotplug/cpqphp_ctrl.c
View File

@ -2273,7 +2273,7 @@ static u32 configure_new_device(struct controller *ctrl, struct pci_func *func
while ((function < max_functions) && (!stop_it)) {
pci_bus_read_config_dword(ctrl->pci_bus, PCI_DEVFN(func->device, function), 0x00, &ID);
if (ID == 0xFFFFFFFF) {
if (PCI_POSSIBLE_ERROR(ID)) {
function++;
} else {
/* Setup slot structure. */
@ -2517,7 +2517,7 @@ static int configure_new_function(struct controller *ctrl, struct pci_func *func
pci_bus_read_config_dword(pci_bus, PCI_DEVFN(device, 0), 0x00, &ID);
pci_bus->number = func->bus;
if (ID != 0xFFFFFFFF) { /* device present */
if (!PCI_POSSIBLE_ERROR(ID)) { /* device present */
/* Setup slot structure. */
new_slot = cpqhp_slot_create(hold_bus_node->base);

10
drivers/pci/hotplug/pciehp_hpc.c
View File

@ -89,7 +89,7 @@ static int pcie_poll_cmd(struct controller *ctrl, int timeout)
do {
pcie_capability_read_word(pdev, PCI_EXP_SLTSTA, &slot_status);
if (slot_status == (u16) ~0) {
if (PCI_POSSIBLE_ERROR(slot_status)) {
ctrl_info(ctrl, "%s: no response from device\n",
__func__);
return 0;
@ -165,7 +165,7 @@ static void pcie_do_write_cmd(struct controller *ctrl, u16 cmd,
pcie_wait_cmd(ctrl);
pcie_capability_read_word(pdev, PCI_EXP_SLTCTL, &slot_ctrl);
if (slot_ctrl == (u16) ~0) {
if (PCI_POSSIBLE_ERROR(slot_ctrl)) {
ctrl_info(ctrl, "%s: no response from device\n", __func__);
goto out;
}
@ -236,7 +236,7 @@ int pciehp_check_link_active(struct controller *ctrl)
int ret;
ret = pcie_capability_read_word(pdev, PCI_EXP_LNKSTA, &lnk_status);
if (ret == PCIBIOS_DEVICE_NOT_FOUND || lnk_status == (u16)~0)
if (ret == PCIBIOS_DEVICE_NOT_FOUND || PCI_POSSIBLE_ERROR(lnk_status))
return -ENODEV;
ret = !!(lnk_status & PCI_EXP_LNKSTA_DLLLA);
@ -443,7 +443,7 @@ int pciehp_card_present(struct controller *ctrl)
int ret;
ret = pcie_capability_read_word(pdev, PCI_EXP_SLTSTA, &slot_status);
if (ret == PCIBIOS_DEVICE_NOT_FOUND || slot_status == (u16)~0)
if (ret == PCIBIOS_DEVICE_NOT_FOUND || PCI_POSSIBLE_ERROR(slot_status))
return -ENODEV;
return !!(slot_status & PCI_EXP_SLTSTA_PDS);
@ -621,7 +621,7 @@ static irqreturn_t pciehp_isr(int irq, void *dev_id)
read_status:
pcie_capability_read_word(pdev, PCI_EXP_SLTSTA, &status);
if (status == (u16) ~0) {
if (PCI_POSSIBLE_ERROR(status)) {
ctrl_info(ctrl, "%s: no response from device\n", __func__);
if (parent)
pm_runtime_put(parent);

10
drivers/pci/pci.c
View File

@ -1115,7 +1115,7 @@ static int pci_raw_set_power_state(struct pci_dev *dev, pci_power_t state)
return -EIO;
pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
if (pmcsr == (u16) ~0) {
if (PCI_POSSIBLE_ERROR(pmcsr)) {
pci_err(dev, "can't change power state from %s to %s (config space inaccessible)\n",
pci_power_name(dev->current_state),
pci_power_name(state));
@ -1271,16 +1271,16 @@ static int pci_dev_wait(struct pci_dev *dev, char *reset_type, int timeout)
* After reset, the device should not silently discard config
* requests, but it may still indicate that it needs more time by
* responding to them with CRS completions. The Root Port will
* generally synthesize ~0 data to complete the read (except when
* CRS SV is enabled and the read was for the Vendor ID; in that
* case it synthesizes 0x0001 data).
* generally synthesize ~0 (PCI_ERROR_RESPONSE) data to complete
* the read (except when CRS SV is enabled and the read was for the
* Vendor ID; in that case it synthesizes 0x0001 data).
*
* Wait for the device to return a non-CRS completion. Read the
* Command register instead of Vendor ID so we don't have to
* contend with the CRS SV value.
*/
pci_read_config_dword(dev, PCI_COMMAND, &id);
while (id == ~0) {
while (PCI_POSSIBLE_ERROR(id)) {
if (delay > timeout) {
pci_warn(dev, "not ready %dms after %s; giving up\n",
delay - 1, reset_type);

4
drivers/pci/pcie/dpc.c
View File

@ -79,7 +79,7 @@ static bool dpc_completed(struct pci_dev *pdev)
u16 status;
pci_read_config_word(pdev, pdev->dpc_cap + PCI_EXP_DPC_STATUS, &status);
if ((status != 0xffff) && (status & PCI_EXP_DPC_STATUS_TRIGGER))
if ((!PCI_POSSIBLE_ERROR(status)) && (status & PCI_EXP_DPC_STATUS_TRIGGER))
return false;
if (test_bit(PCI_DPC_RECOVERING, &pdev->priv_flags))
@ -312,7 +312,7 @@ static irqreturn_t dpc_irq(int irq, void *context)
pci_read_config_word(pdev, cap + PCI_EXP_DPC_STATUS, &status);
if (!(status & PCI_EXP_DPC_STATUS_INTERRUPT) || status == (u16)(~0))
if (!(status & PCI_EXP_DPC_STATUS_INTERRUPT) || PCI_POSSIBLE_ERROR(status))
return IRQ_NONE;
pci_write_config_word(pdev, cap + PCI_EXP_DPC_STATUS,

4
drivers/pci/pcie/pme.c
View File

@ -224,7 +224,7 @@ static void pcie_pme_work_fn(struct work_struct *work)
break;
pcie_capability_read_dword(port, PCI_EXP_RTSTA, &rtsta);
if (rtsta == (u32) ~0)
if (PCI_POSSIBLE_ERROR(rtsta))
break;
if (rtsta & PCI_EXP_RTSTA_PME) {
@ -274,7 +274,7 @@ static irqreturn_t pcie_pme_irq(int irq, void *context)
spin_lock_irqsave(&data->lock, flags);
pcie_capability_read_dword(port, PCI_EXP_RTSTA, &rtsta);
if (rtsta == (u32) ~0 || !(rtsta & PCI_EXP_RTSTA_PME)) {
if (PCI_POSSIBLE_ERROR(rtsta) || !(rtsta & PCI_EXP_RTSTA_PME)) {
spin_unlock_irqrestore(&data->lock, flags);
return IRQ_NONE;
}

10
drivers/pci/probe.c
View File

@ -206,14 +206,14 @@ int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
* memory BAR or a ROM, bit 0 must be clear; if it's an io BAR, bit
* 1 must be clear.
*/
if (sz == 0xffffffff)
if (PCI_POSSIBLE_ERROR(sz))
sz = 0;
/*
* I don't know how l can have all bits set. Copied from old code.
* Maybe it fixes a bug on some ancient platform.
*/
if (l == 0xffffffff)
if (PCI_POSSIBLE_ERROR(l))
l = 0;
if (type == pci_bar_unknown) {
@ -1675,7 +1675,7 @@ static int pci_cfg_space_size_ext(struct pci_dev *dev)
if (pci_read_config_dword(dev, pos, &status) != PCIBIOS_SUCCESSFUL)
return PCI_CFG_SPACE_SIZE;
if (status == 0xffffffff || pci_ext_cfg_is_aliased(dev))
if (PCI_POSSIBLE_ERROR(status) || pci_ext_cfg_is_aliased(dev))
return PCI_CFG_SPACE_SIZE;
return PCI_CFG_SPACE_EXP_SIZE;
@ -2363,8 +2363,8 @@ bool pci_bus_generic_read_dev_vendor_id(struct pci_bus *bus, int devfn, u32 *l,
if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, l))
return false;
/* Some broken boards return 0 or ~0 if a slot is empty: */
if (*l == 0xffffffff || *l == 0x00000000 ||
/* Some broken boards return 0 or ~0 (PCI_ERROR_RESPONSE) if a slot is empty: */
if (PCI_POSSIBLE_ERROR(*l) || *l == 0x00000000 ||
*l == 0x0000ffff || *l == 0xffff0000)
return false;

9
include/linux/pci.h
View File

@ -154,6 +154,15 @@ enum pci_interrupt_pin {
/* The number of legacy PCI INTx interrupts */
#define PCI_NUM_INTX 4
/*
* Reading from a device that doesn't respond typically returns ~0. A
* successful read from a device may also return ~0, so you need additional
* information to reliably identify errors.
*/
#define PCI_ERROR_RESPONSE (~0ULL)
#define PCI_SET_ERROR_RESPONSE(val) (*(val) = ((typeof(*(val))) PCI_ERROR_RESPONSE))
#define PCI_POSSIBLE_ERROR(val) ((val) == ((typeof(val)) PCI_ERROR_RESPONSE))
/*
* pci_power_t values must match the bits in the Capabilities PME_Support
* and Control/Status PowerState fields in the Power Management capability.