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path: root/drivers/pci/probe.c
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Diffstat (limited to 'drivers/pci/probe.c')
-rw-r--r--drivers/pci/probe.c372
1 files changed, 235 insertions, 137 deletions
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 14e0ea1ff38b..ef5377438a1e 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
/*
* probe.c - PCI detection and setup code
*/
@@ -69,8 +70,8 @@ static int find_anything(struct device *dev, void *data)
}
/*
- * Some device drivers need know if pci is initiated.
- * Basically, we think pci is not initiated when there
+ * Some device drivers need know if PCI is initiated.
+ * Basically, we think PCI is not initiated when there
* is no device to be found on the pci_bus_type.
*/
int no_pci_devices(void)
@@ -116,12 +117,16 @@ static u64 pci_size(u64 base, u64 maxbase, u64 mask)
if (!size)
return 0;
- /* Get the lowest of them to find the decode size, and
- from that the extent. */
+ /*
+ * Get the lowest of them to find the decode size, and from that
+ * the extent.
+ */
size = (size & ~(size-1)) - 1;
- /* base == maxbase can be valid only if the BAR has
- already been programmed with all 1s. */
+ /*
+ * base == maxbase can be valid only if the BAR has already been
+ * programmed with all 1s.
+ */
if (base == maxbase && ((base | size) & mask) != mask)
return 0;
@@ -164,7 +169,7 @@ static inline unsigned long decode_bar(struct pci_dev *dev, u32 bar)
#define PCI_COMMAND_DECODE_ENABLE (PCI_COMMAND_MEMORY | PCI_COMMAND_IO)
/**
- * pci_read_base - read a PCI BAR
+ * pci_read_base - Read a PCI BAR
* @dev: the PCI device
* @type: type of the BAR
* @res: resource buffer to be filled in
@@ -253,7 +258,7 @@ int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
sz64 = pci_size(l64, sz64, mask64);
if (!sz64) {
- dev_info(&dev->dev, FW_BUG "reg 0x%x: invalid BAR (can't size)\n",
+ pci_info(dev, FW_BUG "reg 0x%x: invalid BAR (can't size)\n",
pos);
goto fail;
}
@@ -264,7 +269,7 @@ int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
res->flags |= IORESOURCE_UNSET | IORESOURCE_DISABLED;
res->start = 0;
res->end = 0;
- dev_err(&dev->dev, "reg 0x%x: can't handle BAR larger than 4GB (size %#010llx)\n",
+ pci_err(dev, "reg 0x%x: can't handle BAR larger than 4GB (size %#010llx)\n",
pos, (unsigned long long)sz64);
goto out;
}
@@ -274,7 +279,7 @@ int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
res->flags |= IORESOURCE_UNSET;
res->start = 0;
res->end = sz64;
- dev_info(&dev->dev, "reg 0x%x: can't handle BAR above 4GB (bus address %#010llx)\n",
+ pci_info(dev, "reg 0x%x: can't handle BAR above 4GB (bus address %#010llx)\n",
pos, (unsigned long long)l64);
goto out;
}
@@ -301,7 +306,7 @@ int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
res->flags |= IORESOURCE_UNSET;
res->start = 0;
res->end = region.end - region.start;
- dev_info(&dev->dev, "reg 0x%x: initial BAR value %#010llx invalid\n",
+ pci_info(dev, "reg 0x%x: initial BAR value %#010llx invalid\n",
pos, (unsigned long long)region.start);
}
@@ -312,7 +317,7 @@ fail:
res->flags = 0;
out:
if (res->flags)
- dev_printk(KERN_DEBUG, &dev->dev, "reg 0x%x: %pR\n", pos, res);
+ pci_printk(KERN_DEBUG, dev, "reg 0x%x: %pR\n", pos, res);
return (res->flags & IORESOURCE_MEM_64) ? 1 : 0;
}
@@ -375,7 +380,7 @@ static void pci_read_bridge_io(struct pci_bus *child)
region.start = base;
region.end = limit + io_granularity - 1;
pcibios_bus_to_resource(dev->bus, res, &region);
- dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
+ pci_printk(KERN_DEBUG, dev, " bridge window %pR\n", res);
}
}
@@ -397,7 +402,7 @@ static void pci_read_bridge_mmio(struct pci_bus *child)
region.start = base;
region.end = limit + 0xfffff;
pcibios_bus_to_resource(dev->bus, res, &region);
- dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
+ pci_printk(KERN_DEBUG, dev, " bridge window %pR\n", res);
}
}
@@ -437,7 +442,7 @@ static void pci_read_bridge_mmio_pref(struct pci_bus *child)
limit = (pci_bus_addr_t) limit64;
if (base != base64) {
- dev_err(&dev->dev, "can't handle bridge window above 4GB (bus address %#010llx)\n",
+ pci_err(dev, "can't handle bridge window above 4GB (bus address %#010llx)\n",
(unsigned long long) base64);
return;
}
@@ -450,7 +455,7 @@ static void pci_read_bridge_mmio_pref(struct pci_bus *child)
region.start = base;
region.end = limit + 0xfffff;
pcibios_bus_to_resource(dev->bus, res, &region);
- dev_printk(KERN_DEBUG, &dev->dev, " bridge window %pR\n", res);
+ pci_printk(KERN_DEBUG, dev, " bridge window %pR\n", res);
}
}
@@ -463,7 +468,7 @@ void pci_read_bridge_bases(struct pci_bus *child)
if (pci_is_root_bus(child)) /* It's a host bus, nothing to read */
return;
- dev_info(&dev->dev, "PCI bridge to %pR%s\n",
+ pci_info(dev, "PCI bridge to %pR%s\n",
&child->busn_res,
dev->transparent ? " (subtractive decode)" : "");
@@ -480,7 +485,7 @@ void pci_read_bridge_bases(struct pci_bus *child)
if (res && res->flags) {
pci_bus_add_resource(child, res,
PCI_SUBTRACTIVE_DECODE);
- dev_printk(KERN_DEBUG, &dev->dev,
+ pci_printk(KERN_DEBUG, dev,
" bridge window %pR (subtractive decode)\n",
res);
}
@@ -764,7 +769,7 @@ static int pci_register_host_bridge(struct pci_host_bridge *bridge)
bridge->bus = bus;
- /* temporarily move resources off the list */
+ /* Temporarily move resources off the list */
list_splice_init(&bridge->windows, &resources);
bus->sysdata = bridge->sysdata;
bus->msi = bridge->msi;
@@ -776,7 +781,7 @@ static int pci_register_host_bridge(struct pci_host_bridge *bridge)
b = pci_find_bus(pci_domain_nr(bus), bridge->busnr);
if (b) {
- /* If we already got to this bus through a different bridge, ignore it */
+ /* Ignore it if we already got here via a different bridge */
dev_dbg(&b->dev, "bus already known\n");
err = -EEXIST;
goto free;
@@ -869,9 +874,7 @@ static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
int i;
int ret;
- /*
- * Allocate a new bus, and inherit stuff from the parent..
- */
+ /* Allocate a new bus and inherit stuff from the parent */
child = pci_alloc_bus(parent);
if (!child)
return NULL;
@@ -882,16 +885,14 @@ static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
child->sysdata = parent->sysdata;
child->bus_flags = parent->bus_flags;
- /* initialize some portions of the bus device, but don't register it
- * now as the parent is not properly set up yet.
+ /*
+ * Initialize some portions of the bus device, but don't register
+ * it now as the parent is not properly set up yet.
*/
child->dev.class = &pcibus_class;
dev_set_name(&child->dev, "%04x:%02x", pci_domain_nr(child), busnr);
- /*
- * Set up the primary, secondary and subordinate
- * bus numbers.
- */
+ /* Set up the primary, secondary and subordinate bus numbers */
child->number = child->busn_res.start = busnr;
child->primary = parent->busn_res.start;
child->busn_res.end = 0xff;
@@ -907,7 +908,7 @@ static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
pci_set_bus_of_node(child);
pci_set_bus_speed(child);
- /* Set up default resource pointers and names.. */
+ /* Set up default resource pointers and names */
for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++) {
child->resource[i] = &bridge->resource[PCI_BRIDGE_RESOURCES+i];
child->resource[i]->name = child->name;
@@ -1005,11 +1006,11 @@ static int pci_scan_bridge_extend(struct pci_bus *bus, struct pci_dev *dev,
secondary = (buses >> 8) & 0xFF;
subordinate = (buses >> 16) & 0xFF;
- dev_dbg(&dev->dev, "scanning [bus %02x-%02x] behind bridge, pass %d\n",
+ pci_dbg(dev, "scanning [bus %02x-%02x] behind bridge, pass %d\n",
secondary, subordinate, pass);
if (!primary && (primary != bus->number) && secondary && subordinate) {
- dev_warn(&dev->dev, "Primary bus is hard wired to 0\n");
+ pci_warn(dev, "Primary bus is hard wired to 0\n");
primary = bus->number;
}
@@ -1017,13 +1018,15 @@ static int pci_scan_bridge_extend(struct pci_bus *bus, struct pci_dev *dev,
if (!pass &&
(primary != bus->number || secondary <= bus->number ||
secondary > subordinate)) {
- dev_info(&dev->dev, "bridge configuration invalid ([bus %02x-%02x]), reconfiguring\n",
+ pci_info(dev, "bridge configuration invalid ([bus %02x-%02x]), reconfiguring\n",
secondary, subordinate);
broken = 1;
}
- /* Disable MasterAbortMode during probing to avoid reporting
- of bus errors (in some architectures) */
+ /*
+ * Disable Master-Abort Mode during probing to avoid reporting of
+ * bus errors in some architectures.
+ */
pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &bctl);
pci_write_config_word(dev, PCI_BRIDGE_CONTROL,
bctl & ~PCI_BRIDGE_CTL_MASTER_ABORT);
@@ -1033,18 +1036,19 @@ static int pci_scan_bridge_extend(struct pci_bus *bus, struct pci_dev *dev,
if ((secondary || subordinate) && !pcibios_assign_all_busses() &&
!is_cardbus && !broken) {
unsigned int cmax;
+
/*
- * Bus already configured by firmware, process it in the first
- * pass and just note the configuration.
+ * Bus already configured by firmware, process it in the
+ * first pass and just note the configuration.
*/
if (pass)
goto out;
/*
- * The bus might already exist for two reasons: Either we are
- * rescanning the bus or the bus is reachable through more than
- * one bridge. The second case can happen with the i450NX
- * chipset.
+ * The bus might already exist for two reasons: Either we
+ * are rescanning the bus or the bus is reachable through
+ * more than one bridge. The second case can happen with
+ * the i450NX chipset.
*/
child = pci_find_bus(pci_domain_nr(bus), secondary);
if (!child) {
@@ -1058,24 +1062,29 @@ static int pci_scan_bridge_extend(struct pci_bus *bus, struct pci_dev *dev,
cmax = pci_scan_child_bus(child);
if (cmax > subordinate)
- dev_warn(&dev->dev, "bridge has subordinate %02x but max busn %02x\n",
+ pci_warn(dev, "bridge has subordinate %02x but max busn %02x\n",
subordinate, cmax);
- /* subordinate should equal child->busn_res.end */
+
+ /* Subordinate should equal child->busn_res.end */
if (subordinate > max)
max = subordinate;
} else {
+
/*
* We need to assign a number to this bus which we always
* do in the second pass.
*/
if (!pass) {
if (pcibios_assign_all_busses() || broken || is_cardbus)
- /* Temporarily disable forwarding of the
- configuration cycles on all bridges in
- this bus segment to avoid possible
- conflicts in the second pass between two
- bridges programmed with overlapping
- bus ranges. */
+
+ /*
+ * Temporarily disable forwarding of the
+ * configuration cycles on all bridges in
+ * this bus segment to avoid possible
+ * conflicts in the second pass between two
+ * bridges programmed with overlapping bus
+ * ranges.
+ */
pci_write_config_dword(dev, PCI_PRIMARY_BUS,
buses & ~0xffffff);
goto out;
@@ -1084,9 +1093,11 @@ static int pci_scan_bridge_extend(struct pci_bus *bus, struct pci_dev *dev,
/* Clear errors */
pci_write_config_word(dev, PCI_STATUS, 0xffff);
- /* Prevent assigning a bus number that already exists.
- * This can happen when a bridge is hot-plugged, so in
- * this case we only re-scan this bus. */
+ /*
+ * Prevent assigning a bus number that already exists.
+ * This can happen when a bridge is hot-plugged, so in this
+ * case we only re-scan this bus.
+ */
child = pci_find_bus(pci_domain_nr(bus), max+1);
if (!child) {
child = pci_add_new_bus(bus, dev, max+1);
@@ -1113,19 +1124,18 @@ static int pci_scan_bridge_extend(struct pci_bus *bus, struct pci_dev *dev,
buses |= CARDBUS_LATENCY_TIMER << 24;
}
- /*
- * We need to blast all three values with a single write.
- */
+ /* We need to blast all three values with a single write */
pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses);
if (!is_cardbus) {
child->bridge_ctl = bctl;
max = pci_scan_child_bus_extend(child, available_buses);
} else {
+
/*
- * For CardBus bridges, we leave 4 bus numbers
- * as cards with a PCI-to-PCI bridge can be
- * inserted later.
+ * For CardBus bridges, we leave 4 bus numbers as
+ * cards with a PCI-to-PCI bridge can be inserted
+ * later.
*/
for (i = 0; i < CARDBUS_RESERVE_BUSNR; i++) {
struct pci_bus *parent = bus;
@@ -1141,10 +1151,11 @@ static int pci_scan_bridge_extend(struct pci_bus *bus, struct pci_dev *dev,
parent = parent->parent;
}
if (j) {
+
/*
- * Often, there are two cardbus bridges
- * -- try to leave one valid bus number
- * for each one.
+ * Often, there are two CardBus
+ * bridges -- try to leave one
+ * valid bus number for each one.
*/
i /= 2;
break;
@@ -1152,9 +1163,8 @@ static int pci_scan_bridge_extend(struct pci_bus *bus, struct pci_dev *dev,
}
max += i;
}
- /*
- * Set the subordinate bus number to its real value.
- */
+
+ /* Set subordinate bus number to its real value */
pci_bus_update_busn_res_end(child, max);
pci_write_config_byte(dev, PCI_SUBORDINATE_BUS, max);
}
@@ -1295,7 +1305,7 @@ static void set_pcie_thunderbolt(struct pci_dev *dev)
}
/**
- * pci_ext_cfg_is_aliased - is ext config space just an alias of std config?
+ * pci_ext_cfg_is_aliased - Is ext config space just an alias of std config?
* @dev: PCI device
*
* PCI Express to PCI/PCI-X Bridge Specification, rev 1.0, 4.1.4 says that
@@ -1332,7 +1342,7 @@ static bool pci_ext_cfg_is_aliased(struct pci_dev *dev)
}
/**
- * pci_cfg_space_size - get the configuration space size of the PCI device.
+ * pci_cfg_space_size - Get the configuration space size of the PCI device
* @dev: PCI device
*
* Regular PCI devices have 256 bytes, but PCI-X 2 and PCI Express devices
@@ -1398,7 +1408,7 @@ static void pci_msi_setup_pci_dev(struct pci_dev *dev)
}
/**
- * pci_intx_mask_broken - test PCI_COMMAND_INTX_DISABLE writability
+ * pci_intx_mask_broken - Test PCI_COMMAND_INTX_DISABLE writability
* @dev: PCI device
*
* Test whether PCI_COMMAND_INTX_DISABLE is writable for @dev. Check this
@@ -1426,11 +1436,11 @@ static int pci_intx_mask_broken(struct pci_dev *dev)
}
/**
- * pci_setup_device - fill in class and map information of a device
+ * pci_setup_device - Fill in class and map information of a device
* @dev: the device structure to fill
*
* Initialize the device structure with information about the device's
- * vendor,class,memory and IO-space addresses,IRQ lines etc.
+ * vendor,class,memory and IO-space addresses, IRQ lines etc.
* Called at initialisation of the PCI subsystem and by CardBus services.
* Returns 0 on success and negative if unknown type of device (not normal,
* bridge or CardBus).
@@ -1456,8 +1466,11 @@ int pci_setup_device(struct pci_dev *dev)
set_pcie_port_type(dev);
pci_dev_assign_slot(dev);
- /* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer)
- set this higher, assuming the system even supports it. */
+
+ /*
+ * Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer)
+ * set this higher, assuming the system even supports it.
+ */
dev->dma_mask = 0xffffffff;
dev_set_name(&dev->dev, "%04x:%02x:%02x.%d", pci_domain_nr(dev->bus),
@@ -1468,13 +1481,13 @@ int pci_setup_device(struct pci_dev *dev)
dev->revision = class & 0xff;
dev->class = class >> 8; /* upper 3 bytes */
- dev_printk(KERN_DEBUG, &dev->dev, "[%04x:%04x] type %02x class %#08x\n",
+ pci_printk(KERN_DEBUG, dev, "[%04x:%04x] type %02x class %#08x\n",
dev->vendor, dev->device, dev->hdr_type, dev->class);
- /* need to have dev->class ready */
+ /* Need to have dev->class ready */
dev->cfg_size = pci_cfg_space_size(dev);
- /* need to have dev->cfg_size ready */
+ /* Need to have dev->cfg_size ready */
set_pcie_thunderbolt(dev);
/* "Unknown power state" */
@@ -1482,13 +1495,14 @@ int pci_setup_device(struct pci_dev *dev)
/* Early fixups, before probing the BARs */
pci_fixup_device(pci_fixup_early, dev);
- /* device class may be changed after fixup */
+
+ /* Device class may be changed after fixup */
class = dev->class >> 8;
if (dev->non_compliant_bars) {
pci_read_config_word(dev, PCI_COMMAND, &cmd);
if (cmd & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) {
- dev_info(&dev->dev, "device has non-compliant BARs; disabling IO/MEM decoding\n");
+ pci_info(dev, "device has non-compliant BARs; disabling IO/MEM decoding\n");
cmd &= ~PCI_COMMAND_IO;
cmd &= ~PCI_COMMAND_MEMORY;
pci_write_config_word(dev, PCI_COMMAND, cmd);
@@ -1521,14 +1535,14 @@ int pci_setup_device(struct pci_dev *dev)
res = &dev->resource[0];
res->flags = LEGACY_IO_RESOURCE;
pcibios_bus_to_resource(dev->bus, res, &region);
- dev_info(&dev->dev, "legacy IDE quirk: reg 0x10: %pR\n",
+ pci_info(dev, "legacy IDE quirk: reg 0x10: %pR\n",
res);
region.start = 0x3F6;
region.end = 0x3F6;
res = &dev->resource[1];
res->flags = LEGACY_IO_RESOURCE;
pcibios_bus_to_resource(dev->bus, res, &region);
- dev_info(&dev->dev, "legacy IDE quirk: reg 0x14: %pR\n",
+ pci_info(dev, "legacy IDE quirk: reg 0x14: %pR\n",
res);
}
if ((progif & 4) == 0) {
@@ -1537,14 +1551,14 @@ int pci_setup_device(struct pci_dev *dev)
res = &dev->resource[2];
res->flags = LEGACY_IO_RESOURCE;
pcibios_bus_to_resource(dev->bus, res, &region);
- dev_info(&dev->dev, "legacy IDE quirk: reg 0x18: %pR\n",
+ pci_info(dev, "legacy IDE quirk: reg 0x18: %pR\n",
res);
region.start = 0x376;
region.end = 0x376;
res = &dev->resource[3];
res->flags = LEGACY_IO_RESOURCE;
pcibios_bus_to_resource(dev->bus, res, &region);
- dev_info(&dev->dev, "legacy IDE quirk: reg 0x1c: %pR\n",
+ pci_info(dev, "legacy IDE quirk: reg 0x1c: %pR\n",
res);
}
}
@@ -1553,9 +1567,12 @@ int pci_setup_device(struct pci_dev *dev)
case PCI_HEADER_TYPE_BRIDGE: /* bridge header */
if (class != PCI_CLASS_BRIDGE_PCI)
goto bad;
- /* The PCI-to-PCI bridge spec requires that subtractive
- decoding (i.e. transparent) bridge must have programming
- interface code of 0x01. */
+
+ /*
+ * The PCI-to-PCI bridge spec requires that subtractive
+ * decoding (i.e. transparent) bridge must have programming
+ * interface code of 0x01.
+ */
pci_read_irq(dev);
dev->transparent = ((dev->class & 0xff) == 1);
pci_read_bases(dev, 2, PCI_ROM_ADDRESS1);
@@ -1577,12 +1594,12 @@ int pci_setup_device(struct pci_dev *dev)
break;
default: /* unknown header */
- dev_err(&dev->dev, "unknown header type %02x, ignoring device\n",
+ pci_err(dev, "unknown header type %02x, ignoring device\n",
dev->hdr_type);
return -EIO;
bad:
- dev_err(&dev->dev, "ignoring class %#08x (doesn't match header type %02x)\n",
+ pci_err(dev, "ignoring class %#08x (doesn't match header type %02x)\n",
dev->class, dev->hdr_type);
dev->class = PCI_CLASS_NOT_DEFINED << 8;
}
@@ -1606,7 +1623,7 @@ static void pci_configure_mps(struct pci_dev *dev)
return;
if (pcie_bus_config == PCIE_BUS_TUNE_OFF) {
- dev_warn(&dev->dev, "Max Payload Size %d, but upstream %s set to %d; if necessary, use \"pci=pcie_bus_safe\" and report a bug\n",
+ pci_warn(dev, "Max Payload Size %d, but upstream %s set to %d; if necessary, use \"pci=pcie_bus_safe\" and report a bug\n",
mps, pci_name(bridge), p_mps);
return;
}
@@ -1620,12 +1637,12 @@ static void pci_configure_mps(struct pci_dev *dev)
rc = pcie_set_mps(dev, p_mps);
if (rc) {
- dev_warn(&dev->dev, "can't set Max Payload Size to %d; if necessary, use \"pci=pcie_bus_safe\" and report a bug\n",
+ pci_warn(dev, "can't set Max Payload Size to %d; if necessary, use \"pci=pcie_bus_safe\" and report a bug\n",
p_mps);
return;
}
- dev_info(&dev->dev, "Max Payload Size set to %d (was %d, max %d)\n",
+ pci_info(dev, "Max Payload Size set to %d (was %d, max %d)\n",
p_mps, mps, 128 << dev->pcie_mpss);
}
@@ -1645,8 +1662,7 @@ static void program_hpp_type0(struct pci_dev *dev, struct hpp_type0 *hpp)
hpp = &pci_default_type0;
if (hpp->revision > 1) {
- dev_warn(&dev->dev,
- "PCI settings rev %d not supported; using defaults\n",
+ pci_warn(dev, "PCI settings rev %d not supported; using defaults\n",
hpp->revision);
hpp = &pci_default_type0;
}
@@ -1684,7 +1700,7 @@ static void program_hpp_type1(struct pci_dev *dev, struct hpp_type1 *hpp)
if (!pos)
return;
- dev_warn(&dev->dev, "PCI-X settings not supported\n");
+ pci_warn(dev, "PCI-X settings not supported\n");
}
static bool pcie_root_rcb_set(struct pci_dev *dev)
@@ -1714,7 +1730,7 @@ static void program_hpp_type2(struct pci_dev *dev, struct hpp_type2 *hpp)
return;
if (hpp->revision > 1) {
- dev_warn(&dev->dev, "PCIe settings rev %d not supported\n",
+ pci_warn(dev, "PCIe settings rev %d not supported\n",
hpp->revision);
return;
}
@@ -1772,6 +1788,7 @@ static void program_hpp_type2(struct pci_dev *dev, struct hpp_type2 *hpp)
/* Initialize Advanced Error Capabilities and Control Register */
pci_read_config_dword(dev, pos + PCI_ERR_CAP, &reg32);
reg32 = (reg32 & hpp->adv_err_cap_and) | hpp->adv_err_cap_or;
+
/* Don't enable ECRC generation or checking if unsupported */
if (!(reg32 & PCI_ERR_CAP_ECRC_GENC))
reg32 &= ~PCI_ERR_CAP_ECRC_GENE;
@@ -1818,7 +1835,7 @@ int pci_configure_extended_tags(struct pci_dev *dev, void *ign)
*/
if (host->no_ext_tags) {
if (ctl & PCI_EXP_DEVCTL_EXT_TAG) {
- dev_info(&dev->dev, "disabling Extended Tags\n");
+ pci_info(dev, "disabling Extended Tags\n");
pcie_capability_clear_word(dev, PCI_EXP_DEVCTL,
PCI_EXP_DEVCTL_EXT_TAG);
}
@@ -1826,7 +1843,7 @@ int pci_configure_extended_tags(struct pci_dev *dev, void *ign)
}
if (!(ctl & PCI_EXP_DEVCTL_EXT_TAG)) {
- dev_info(&dev->dev, "enabling Extended Tags\n");
+ pci_info(dev, "enabling Extended Tags\n");
pcie_capability_set_word(dev, PCI_EXP_DEVCTL,
PCI_EXP_DEVCTL_EXT_TAG);
}
@@ -1871,10 +1888,42 @@ static void pci_configure_relaxed_ordering(struct pci_dev *dev)
if (root->dev_flags & PCI_DEV_FLAGS_NO_RELAXED_ORDERING) {
pcie_capability_clear_word(dev, PCI_EXP_DEVCTL,
PCI_EXP_DEVCTL_RELAX_EN);
- dev_info(&dev->dev, "Disable Relaxed Ordering because the Root Port didn't support it\n");
+ pci_info(dev, "Relaxed Ordering disabled because the Root Port didn't support it\n");
}
}
+static void pci_configure_ltr(struct pci_dev *dev)
+{
+#ifdef CONFIG_PCIEASPM
+ u32 cap;
+ struct pci_dev *bridge;
+
+ if (!pci_is_pcie(dev))
+ return;
+
+ pcie_capability_read_dword(dev, PCI_EXP_DEVCAP2, &cap);
+ if (!(cap & PCI_EXP_DEVCAP2_LTR))
+ return;
+
+ /*
+ * Software must not enable LTR in an Endpoint unless the Root
+ * Complex and all intermediate Switches indicate support for LTR.
+ * PCIe r3.1, sec 6.18.
+ */
+ if (pci_pcie_type(dev) == PCI_EXP_TYPE_ROOT_PORT)
+ dev->ltr_path = 1;
+ else {
+ bridge = pci_upstream_bridge(dev);
+ if (bridge && bridge->ltr_path)
+ dev->ltr_path = 1;
+ }
+
+ if (dev->ltr_path)
+ pcie_capability_set_word(dev, PCI_EXP_DEVCTL2,
+ PCI_EXP_DEVCTL2_LTR_EN);
+#endif
+}
+
static void pci_configure_device(struct pci_dev *dev)
{
struct hotplug_params hpp;
@@ -1883,6 +1932,7 @@ static void pci_configure_device(struct pci_dev *dev)
pci_configure_mps(dev);
pci_configure_extended_tags(dev, NULL);
pci_configure_relaxed_ordering(dev);
+ pci_configure_ltr(dev);
memset(&hpp, 0, sizeof(hpp));
ret = pci_get_hp_params(dev, &hpp);
@@ -1902,10 +1952,11 @@ static void pci_release_capabilities(struct pci_dev *dev)
}
/**
- * pci_release_dev - free a pci device structure when all users of it are finished.
+ * pci_release_dev - Free a PCI device structure when all users of it are
+ * finished
* @dev: device that's been disconnected
*
- * Will be called only by the device core when all users of this pci device are
+ * Will be called only by the device core when all users of this PCI device are
* done.
*/
static void pci_release_dev(struct device *dev)
@@ -1993,7 +2044,7 @@ bool pci_bus_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: */
+ /* Some broken boards return 0 or ~0 if a slot is empty: */
if (*l == 0xffffffff || *l == 0x00000000 ||
*l == 0x0000ffff || *l == 0xffff0000)
return false;
@@ -2006,8 +2057,8 @@ bool pci_bus_read_dev_vendor_id(struct pci_bus *bus, int devfn, u32 *l,
EXPORT_SYMBOL(pci_bus_read_dev_vendor_id);
/*
- * Read the config data for a PCI device, sanity-check it
- * and fill in the dev structure...
+ * Read the config data for a PCI device, sanity-check it,
+ * and fill in the dev structure.
*/
static struct pci_dev *pci_scan_device(struct pci_bus *bus, int devfn)
{
@@ -2073,7 +2124,7 @@ static void pci_init_capabilities(struct pci_dev *dev)
}
/*
- * This is the equivalent of pci_host_bridge_msi_domain that acts on
+ * This is the equivalent of pci_host_bridge_msi_domain() that acts on
* devices. Firmware interfaces that can select the MSI domain on a
* per-device basis should be called from here.
*/
@@ -2082,7 +2133,7 @@ static struct irq_domain *pci_dev_msi_domain(struct pci_dev *dev)
struct irq_domain *d;
/*
- * If a domain has been set through the pcibios_add_device
+ * If a domain has been set through the pcibios_add_device()
* callback, then this is the one (platform code knows best).
*/
d = dev_get_msi_domain(&dev->dev);
@@ -2136,10 +2187,10 @@ void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
/* Fix up broken headers */
pci_fixup_device(pci_fixup_header, dev);
- /* moved out from quirk header fixup code */
+ /* Moved out from quirk header fixup code */
pci_reassigndev_resource_alignment(dev);
- /* Clear the state_saved flag. */
+ /* Clear the state_saved flag */
dev->state_saved = false;
/* Initialize various capabilities */
@@ -2156,7 +2207,7 @@ void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
ret = pcibios_add_device(dev);
WARN_ON(ret < 0);
- /* Setup MSI irq domain */
+ /* Set up MSI IRQ domain */
pci_set_msi_domain(dev);
/* Notifier could use PCI capabilities */
@@ -2215,29 +2266,34 @@ static unsigned next_fn(struct pci_bus *bus, struct pci_dev *dev, unsigned fn)
static int only_one_child(struct pci_bus *bus)
{
- struct pci_dev *parent = bus->self;
+ struct pci_dev *bridge = bus->self;
- if (!parent || !pci_is_pcie(parent))
+ /*
+ * Systems with unusual topologies set PCI_SCAN_ALL_PCIE_DEVS so
+ * we scan for all possible devices, not just Device 0.
+ */
+ if (pci_has_flag(PCI_SCAN_ALL_PCIE_DEVS))
return 0;
- if (pci_pcie_type(parent) == PCI_EXP_TYPE_ROOT_PORT)
- return 1;
/*
- * PCIe downstream ports are bridges that normally lead to only a
- * device 0, but if PCI_SCAN_ALL_PCIE_DEVS is set, scan all
- * possible devices, not just device 0. See PCIe spec r3.0,
- * sec 7.3.1.
+ * A PCIe Downstream Port normally leads to a Link with only Device
+ * 0 on it (PCIe spec r3.1, sec 7.3.1). As an optimization, scan
+ * only for Device 0 in that situation.
+ *
+ * Checking has_secondary_link is a hack to identify Downstream
+ * Ports because sometimes Switches are configured such that the
+ * PCIe Port Type labels are backwards.
*/
- if (parent->has_secondary_link &&
- !pci_has_flag(PCI_SCAN_ALL_PCIE_DEVS))
+ if (bridge && pci_is_pcie(bridge) && bridge->has_secondary_link)
return 1;
+
return 0;
}
/**
- * pci_scan_slot - scan a PCI slot on a bus for devices.
+ * pci_scan_slot - Scan a PCI slot on a bus for devices
* @bus: PCI bus to scan
- * @devfn: slot number to scan (must have zero function.)
+ * @devfn: slot number to scan (must have zero function)
*
* Scan a PCI slot on the specified PCI bus for devices, adding
* discovered devices to the @bus->devices list. New devices
@@ -2268,7 +2324,7 @@ int pci_scan_slot(struct pci_bus *bus, int devfn)
}
}
- /* only one slot has pcie device */
+ /* Only one slot has PCIe device */
if (bus->self && nr)
pcie_aspm_init_link_state(bus->self);
@@ -2317,7 +2373,9 @@ static void pcie_write_mps(struct pci_dev *dev, int mps)
if (pci_pcie_type(dev) != PCI_EXP_TYPE_ROOT_PORT &&
dev->bus->self)
- /* For "Performance", the assumption is made that
+
+ /*
+ * For "Performance", the assumption is made that
* downstream communication will never be larger than
* the MRRS. So, the MPS only needs to be configured
* for the upstream communication. This being the case,
@@ -2334,27 +2392,30 @@ static void pcie_write_mps(struct pci_dev *dev, int mps)
rc = pcie_set_mps(dev, mps);
if (rc)
- dev_err(&dev->dev, "Failed attempting to set the MPS\n");
+ pci_err(dev, "Failed attempting to set the MPS\n");
}
static void pcie_write_mrrs(struct pci_dev *dev)
{
int rc, mrrs;
- /* In the "safe" case, do not configure the MRRS. There appear to be
+ /*
+ * In the "safe" case, do not configure the MRRS. There appear to be
* issues with setting MRRS to 0 on a number of devices.
*/
if (pcie_bus_config != PCIE_BUS_PERFORMANCE)
return;
- /* For Max performance, the MRRS must be set to the largest supported
+ /*
+ * For max performance, the MRRS must be set to the largest supported
* value. However, it cannot be configured larger than the MPS the
* device or the bus can support. This should already be properly
- * configured by a prior call to pcie_write_mps.
+ * configured by a prior call to pcie_write_mps().
*/
mrrs = pcie_get_mps(dev);
- /* MRRS is a R/W register. Invalid values can be written, but a
+ /*
+ * MRRS is a R/W register. Invalid values can be written, but a
* subsequent read will verify if the value is acceptable or not.
* If the MRRS value provided is not acceptable (e.g., too large),
* shrink the value until it is acceptable to the HW.
@@ -2364,12 +2425,12 @@ static void pcie_write_mrrs(struct pci_dev *dev)
if (!rc)
break;
- dev_warn(&dev->dev, "Failed attempting to set the MRRS\n");
+ pci_warn(dev, "Failed attempting to set the MRRS\n");
mrrs /= 2;
}
if (mrrs < 128)
- dev_err(&dev->dev, "MRRS was unable to be configured with a safe value. If problems are experienced, try running with pci=pcie_bus_safe\n");
+ pci_err(dev, "MRRS was unable to be configured with a safe value. If problems are experienced, try running with pci=pcie_bus_safe\n");
}
static int pcie_bus_configure_set(struct pci_dev *dev, void *data)
@@ -2389,14 +2450,15 @@ static int pcie_bus_configure_set(struct pci_dev *dev, void *data)
pcie_write_mps(dev, mps);
pcie_write_mrrs(dev);
- dev_info(&dev->dev, "Max Payload Size set to %4d/%4d (was %4d), Max Read Rq %4d\n",
+ pci_info(dev, "Max Payload Size set to %4d/%4d (was %4d), Max Read Rq %4d\n",
pcie_get_mps(dev), 128 << dev->pcie_mpss,
orig_mps, pcie_get_readrq(dev));
return 0;
}
-/* pcie_bus_configure_settings requires that pci_walk_bus work in a top-down,
+/*
+ * pcie_bus_configure_settings() requires that pci_walk_bus work in a top-down,
* parents then children fashion. If this changes, then this code will not
* work as designed.
*/
@@ -2410,7 +2472,8 @@ void pcie_bus_configure_settings(struct pci_bus *bus)
if (!pci_is_pcie(bus->self))
return;
- /* FIXME - Peer to peer DMA is possible, though the endpoint would need
+ /*
+ * FIXME - Peer to peer DMA is possible, though the endpoint would need
* to be aware of the MPS of the destination. To work around this,
* simply force the MPS of the entire system to the smallest possible.
*/
@@ -2464,7 +2527,7 @@ static unsigned int pci_scan_child_bus_extend(struct pci_bus *bus,
for (devfn = 0; devfn < 0x100; devfn += 8)
pci_scan_slot(bus, devfn);
- /* Reserve buses for SR-IOV capability. */
+ /* Reserve buses for SR-IOV capability */
used_buses = pci_iov_bus_range(bus);
max += used_buses;
@@ -2506,6 +2569,7 @@ static unsigned int pci_scan_child_bus_extend(struct pci_bus *bus,
unsigned int buses = 0;
if (!hotplug_bridges && normal_bridges == 1) {
+
/*
* There is only one bridge on the bus (upstream
* port) so it gets all available buses which it
@@ -2514,6 +2578,7 @@ static unsigned int pci_scan_child_bus_extend(struct pci_bus *bus,
*/
buses = available_buses;
} else if (dev->is_hotplug_bridge) {
+
/*
* Distribute the extra buses between hotplug
* bridges if any.
@@ -2572,8 +2637,8 @@ unsigned int pci_scan_child_bus(struct pci_bus *bus)
EXPORT_SYMBOL_GPL(pci_scan_child_bus);
/**
- * pcibios_root_bridge_prepare - Platform-specific host bridge setup.
- * @bridge: Host bridge to set up.
+ * pcibios_root_bridge_prepare - Platform-specific host bridge setup
+ * @bridge: Host bridge to set up
*
* Default empty implementation. Replace with an architecture-specific setup
* routine, if necessary.
@@ -2620,6 +2685,39 @@ err_out:
}
EXPORT_SYMBOL_GPL(pci_create_root_bus);
+int pci_host_probe(struct pci_host_bridge *bridge)
+{
+ struct pci_bus *bus, *child;
+ int ret;
+
+ ret = pci_scan_root_bus_bridge(bridge);
+ if (ret < 0) {
+ dev_err(bridge->dev.parent, "Scanning root bridge failed");
+ return ret;
+ }
+
+ bus = bridge->bus;
+
+ /*
+ * We insert PCI resources into the iomem_resource and
+ * ioport_resource trees in either pci_bus_claim_resources()
+ * or pci_bus_assign_resources().
+ */
+ if (pci_has_flag(PCI_PROBE_ONLY)) {
+ pci_bus_claim_resources(bus);
+ } else {
+ pci_bus_size_bridges(bus);
+ pci_bus_assign_resources(bus);
+
+ list_for_each_entry(child, &bus->children, node)
+ pcie_bus_configure_settings(child);
+ }
+
+ pci_bus_add_devices(bus);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(pci_host_probe);
+
int pci_bus_insert_busn_res(struct pci_bus *b, int bus, int bus_max)
{
struct resource *res = &b->busn_res;
@@ -2776,7 +2874,7 @@ struct pci_bus *pci_scan_bus(int bus, struct pci_ops *ops,
EXPORT_SYMBOL(pci_scan_bus);
/**
- * pci_rescan_bus_bridge_resize - scan a PCI bus for devices.
+ * pci_rescan_bus_bridge_resize - Scan a PCI bus for devices
* @bridge: PCI bridge for the bus to scan
*
* Scan a PCI bus and child buses for new devices, add them,
@@ -2801,11 +2899,11 @@ unsigned int pci_rescan_bus_bridge_resize(struct pci_dev *bridge)
}
/**
- * pci_rescan_bus - scan a PCI bus for devices.
+ * pci_rescan_bus - Scan a PCI bus for devices
* @bus: PCI bus to scan
*
- * Scan a PCI bus and child buses for new devices, adds them,
- * and enables them.
+ * Scan a PCI bus and child buses for new devices, add them,
+ * and enable them.
*
* Returns the max number of subordinate bus discovered.
*/
@@ -2874,7 +2972,7 @@ int pci_hp_add_bridge(struct pci_dev *dev)
break;
}
if (busnr-- > end) {
- dev_err(&dev->dev, "No bus number available for hot-added bridge\n");
+ pci_err(dev, "No bus number available for hot-added bridge\n");
return -1;
}
generated by cgit (git 2.34.1) at 2024-04-20 13:20:03 +0000