summaryrefslogtreecommitdiff
path: root/drivers/pci/search.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/pci/search.c')
-rw-r--r--drivers/pci/search.c122
1 files changed, 98 insertions, 24 deletions
diff --git a/drivers/pci/search.c b/drivers/pci/search.c
index 2b5f720862d3..e6e84dc62e82 100644
--- a/drivers/pci/search.c
+++ b/drivers/pci/search.c
@@ -15,7 +15,6 @@
#include "pci.h"
DECLARE_RWSEM(pci_bus_sem);
-EXPORT_SYMBOL_GPL(pci_bus_sem);
/*
* pci_for_each_dma_alias - Iterate over DMA aliases for a device
@@ -33,7 +32,13 @@ int pci_for_each_dma_alias(struct pci_dev *pdev,
struct pci_bus *bus;
int ret;
- ret = fn(pdev, PCI_DEVID(pdev->bus->number, pdev->devfn), data);
+ /*
+ * The device may have an explicit alias requester ID for DMA where the
+ * requester is on another PCI bus.
+ */
+ pdev = pci_real_dma_dev(pdev);
+
+ ret = fn(pdev, pci_dev_id(pdev), data);
if (ret)
return ret;
@@ -42,9 +47,9 @@ int pci_for_each_dma_alias(struct pci_dev *pdev,
* DMA, iterate over that too.
*/
if (unlikely(pdev->dma_alias_mask)) {
- u8 devfn;
+ unsigned int devfn;
- for_each_set_bit(devfn, pdev->dma_alias_mask, U8_MAX) {
+ for_each_set_bit(devfn, pdev->dma_alias_mask, MAX_NR_DEVFNS) {
ret = fn(pdev, PCI_DEVID(pdev->bus->number, devfn),
data);
if (ret)
@@ -88,9 +93,7 @@ int pci_for_each_dma_alias(struct pci_dev *pdev,
return ret;
continue;
case PCI_EXP_TYPE_PCIE_BRIDGE:
- ret = fn(tmp,
- PCI_DEVID(tmp->bus->number,
- tmp->devfn), data);
+ ret = fn(tmp, pci_dev_id(tmp), data);
if (ret)
return ret;
continue;
@@ -101,9 +104,7 @@ int pci_for_each_dma_alias(struct pci_dev *pdev,
PCI_DEVID(tmp->subordinate->number,
PCI_DEVFN(0, 0)), data);
else
- ret = fn(tmp,
- PCI_DEVID(tmp->bus->number,
- tmp->devfn), data);
+ ret = fn(tmp, pci_dev_id(tmp), data);
if (ret)
return ret;
}
@@ -167,7 +168,6 @@ struct pci_bus *pci_find_next_bus(const struct pci_bus *from)
struct list_head *n;
struct pci_bus *b = NULL;
- WARN_ON(in_interrupt());
down_read(&pci_bus_sem);
n = from ? from->node.next : pci_root_buses.next;
if (n != &pci_root_buses)
@@ -195,7 +195,6 @@ struct pci_dev *pci_get_slot(struct pci_bus *bus, unsigned int devfn)
{
struct pci_dev *dev;
- WARN_ON(in_interrupt());
down_read(&pci_bus_sem);
list_for_each_entry(dev, &bus->devices, bus_list) {
@@ -240,10 +239,10 @@ struct pci_dev *pci_get_domain_bus_and_slot(int domain, unsigned int bus,
}
EXPORT_SYMBOL(pci_get_domain_bus_and_slot);
-static int match_pci_dev_by_id(struct device *dev, void *data)
+static int match_pci_dev_by_id(struct device *dev, const void *data)
{
struct pci_dev *pdev = to_pci_dev(dev);
- struct pci_device_id *id = data;
+ const struct pci_device_id *id = data;
if (pci_match_one_device(id, pdev))
return 1;
@@ -273,7 +272,6 @@ static struct pci_dev *pci_get_dev_by_id(const struct pci_device_id *id,
struct device *dev_start = NULL;
struct pci_dev *pdev = NULL;
- WARN_ON(in_interrupt());
if (from)
dev_start = &from->dev;
dev = bus_find_device(&pci_bus_type, dev_start, (void *)id,
@@ -284,6 +282,45 @@ static struct pci_dev *pci_get_dev_by_id(const struct pci_device_id *id,
return pdev;
}
+static struct pci_dev *pci_get_dev_by_id_reverse(const struct pci_device_id *id,
+ struct pci_dev *from)
+{
+ struct device *dev;
+ struct device *dev_start = NULL;
+ struct pci_dev *pdev = NULL;
+
+ if (from)
+ dev_start = &from->dev;
+ dev = bus_find_device_reverse(&pci_bus_type, dev_start, (void *)id,
+ match_pci_dev_by_id);
+ if (dev)
+ pdev = to_pci_dev(dev);
+ pci_dev_put(from);
+ return pdev;
+}
+
+enum pci_search_direction {
+ PCI_SEARCH_FORWARD,
+ PCI_SEARCH_REVERSE,
+};
+
+static struct pci_dev *__pci_get_subsys(unsigned int vendor, unsigned int device,
+ unsigned int ss_vendor, unsigned int ss_device,
+ struct pci_dev *from, enum pci_search_direction dir)
+{
+ struct pci_device_id id = {
+ .vendor = vendor,
+ .device = device,
+ .subvendor = ss_vendor,
+ .subdevice = ss_device,
+ };
+
+ if (dir == PCI_SEARCH_FORWARD)
+ return pci_get_dev_by_id(&id, from);
+ else
+ return pci_get_dev_by_id_reverse(&id, from);
+}
+
/**
* pci_get_subsys - begin or continue searching for a PCI device by vendor/subvendor/device/subdevice id
* @vendor: PCI vendor id to match, or %PCI_ANY_ID to match all vendor ids
@@ -304,14 +341,8 @@ struct pci_dev *pci_get_subsys(unsigned int vendor, unsigned int device,
unsigned int ss_vendor, unsigned int ss_device,
struct pci_dev *from)
{
- struct pci_device_id id = {
- .vendor = vendor,
- .device = device,
- .subvendor = ss_vendor,
- .subdevice = ss_device,
- };
-
- return pci_get_dev_by_id(&id, from);
+ return __pci_get_subsys(vendor, device, ss_vendor, ss_device, from,
+ PCI_SEARCH_FORWARD);
}
EXPORT_SYMBOL(pci_get_subsys);
@@ -336,6 +367,19 @@ struct pci_dev *pci_get_device(unsigned int vendor, unsigned int device,
}
EXPORT_SYMBOL(pci_get_device);
+/*
+ * Same semantics as pci_get_device(), except walks the PCI device list
+ * in reverse discovery order.
+ */
+struct pci_dev *pci_get_device_reverse(unsigned int vendor,
+ unsigned int device,
+ struct pci_dev *from)
+{
+ return __pci_get_subsys(vendor, device, PCI_ANY_ID, PCI_ANY_ID, from,
+ PCI_SEARCH_REVERSE);
+}
+EXPORT_SYMBOL(pci_get_device_reverse);
+
/**
* pci_get_class - begin or continue searching for a PCI device by class
* @class: search for a PCI device with this class designation
@@ -366,6 +410,37 @@ struct pci_dev *pci_get_class(unsigned int class, struct pci_dev *from)
EXPORT_SYMBOL(pci_get_class);
/**
+ * pci_get_base_class - searching for a PCI device by matching against the base class code only
+ * @class: search for a PCI device with this base class code
+ * @from: Previous PCI device found in search, or %NULL for new search.
+ *
+ * Iterates through the list of known PCI devices. If a PCI device is found
+ * with a matching base class code, the reference count to the device is
+ * incremented. See pci_match_one_device() to figure out how does this works.
+ * A new search is initiated by passing %NULL as the @from argument.
+ * Otherwise if @from is not %NULL, searches continue from next device on the
+ * global list. The reference count for @from is always decremented if it is
+ * not %NULL.
+ *
+ * Returns:
+ * A pointer to a matched PCI device, %NULL Otherwise.
+ */
+struct pci_dev *pci_get_base_class(unsigned int class, struct pci_dev *from)
+{
+ struct pci_device_id id = {
+ .vendor = PCI_ANY_ID,
+ .device = PCI_ANY_ID,
+ .subvendor = PCI_ANY_ID,
+ .subdevice = PCI_ANY_ID,
+ .class_mask = 0xFF0000,
+ .class = class << 16,
+ };
+
+ return pci_get_dev_by_id(&id, from);
+}
+EXPORT_SYMBOL(pci_get_base_class);
+
+/**
* pci_dev_present - Returns 1 if device matching the device list is present, 0 if not.
* @ids: A pointer to a null terminated list of struct pci_device_id structures
* that describe the type of PCI device the caller is trying to find.
@@ -380,7 +455,6 @@ int pci_dev_present(const struct pci_device_id *ids)
{
struct pci_dev *found = NULL;
- WARN_ON(in_interrupt());
while (ids->vendor || ids->subvendor || ids->class_mask) {
found = pci_get_dev_by_id(ids, NULL);
if (found) {
generated by cgit (git 2.34.1) at 2025-12-24 22:27:33 +0000