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path: root/drivers/pci/pci.c
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Diffstat (limited to 'drivers/pci/pci.c')
-rw-r--r--drivers/pci/pci.c127
1 files changed, 126 insertions, 1 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 84c757ba066..8b44cff2c17 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -744,6 +744,104 @@ int pci_enable_device(struct pci_dev *dev)
return pci_enable_device_bars(dev, (1 << PCI_NUM_RESOURCES) - 1);
}
+/*
+ * Managed PCI resources. This manages device on/off, intx/msi/msix
+ * on/off and BAR regions. pci_dev itself records msi/msix status, so
+ * there's no need to track it separately. pci_devres is initialized
+ * when a device is enabled using managed PCI device enable interface.
+ */
+struct pci_devres {
+ unsigned int disable:1;
+ unsigned int orig_intx:1;
+ unsigned int restore_intx:1;
+ u32 region_mask;
+};
+
+static void pcim_release(struct device *gendev, void *res)
+{
+ struct pci_dev *dev = container_of(gendev, struct pci_dev, dev);
+ struct pci_devres *this = res;
+ int i;
+
+ if (dev->msi_enabled)
+ pci_disable_msi(dev);
+ if (dev->msix_enabled)
+ pci_disable_msix(dev);
+
+ for (i = 0; i < DEVICE_COUNT_RESOURCE; i++)
+ if (this->region_mask & (1 << i))
+ pci_release_region(dev, i);
+
+ if (this->restore_intx)
+ pci_intx(dev, this->orig_intx);
+
+ if (this->disable)
+ pci_disable_device(dev);
+}
+
+static struct pci_devres * get_pci_dr(struct pci_dev *pdev)
+{
+ struct pci_devres *dr, *new_dr;
+
+ dr = devres_find(&pdev->dev, pcim_release, NULL, NULL);
+ if (dr)
+ return dr;
+
+ new_dr = devres_alloc(pcim_release, sizeof(*new_dr), GFP_KERNEL);
+ if (!new_dr)
+ return NULL;
+ return devres_get(&pdev->dev, new_dr, NULL, NULL);
+}
+
+static struct pci_devres * find_pci_dr(struct pci_dev *pdev)
+{
+ if (pci_is_managed(pdev))
+ return devres_find(&pdev->dev, pcim_release, NULL, NULL);
+ return NULL;
+}
+
+/**
+ * pcim_enable_device - Managed pci_enable_device()
+ * @pdev: PCI device to be initialized
+ *
+ * Managed pci_enable_device().
+ */
+int pcim_enable_device(struct pci_dev *pdev)
+{
+ struct pci_devres *dr;
+ int rc;
+
+ dr = get_pci_dr(pdev);
+ if (unlikely(!dr))
+ return -ENOMEM;
+ WARN_ON(!!dr->disable);
+
+ rc = pci_enable_device(pdev);
+ if (!rc) {
+ pdev->is_managed = 1;
+ dr->disable = 1;
+ }
+ return rc;
+}
+
+/**
+ * pcim_pin_device - Pin managed PCI device
+ * @pdev: PCI device to pin
+ *
+ * Pin managed PCI device @pdev. Pinned device won't be disabled on
+ * driver detach. @pdev must have been enabled with
+ * pcim_enable_device().
+ */
+void pcim_pin_device(struct pci_dev *pdev)
+{
+ struct pci_devres *dr;
+
+ dr = find_pci_dr(pdev);
+ WARN_ON(!dr || !dr->disable);
+ if (dr)
+ dr->disable = 0;
+}
+
/**
* pcibios_disable_device - disable arch specific PCI resources for device dev
* @dev: the PCI device to disable
@@ -767,8 +865,13 @@ void __attribute__ ((weak)) pcibios_disable_device (struct pci_dev *dev) {}
void
pci_disable_device(struct pci_dev *dev)
{
+ struct pci_devres *dr;
u16 pci_command;
+ dr = find_pci_dr(dev);
+ if (dr)
+ dr->disable = 0;
+
if (atomic_sub_return(1, &dev->enable_cnt) != 0)
return;
@@ -867,6 +970,8 @@ pci_get_interrupt_pin(struct pci_dev *dev, struct pci_dev **bridge)
*/
void pci_release_region(struct pci_dev *pdev, int bar)
{
+ struct pci_devres *dr;
+
if (pci_resource_len(pdev, bar) == 0)
return;
if (pci_resource_flags(pdev, bar) & IORESOURCE_IO)
@@ -875,6 +980,10 @@ void pci_release_region(struct pci_dev *pdev, int bar)
else if (pci_resource_flags(pdev, bar) & IORESOURCE_MEM)
release_mem_region(pci_resource_start(pdev, bar),
pci_resource_len(pdev, bar));
+
+ dr = find_pci_dr(pdev);
+ if (dr)
+ dr->region_mask &= ~(1 << bar);
}
/**
@@ -893,6 +1002,8 @@ void pci_release_region(struct pci_dev *pdev, int bar)
*/
int pci_request_region(struct pci_dev *pdev, int bar, const char *res_name)
{
+ struct pci_devres *dr;
+
if (pci_resource_len(pdev, bar) == 0)
return 0;
@@ -906,7 +1017,11 @@ int pci_request_region(struct pci_dev *pdev, int bar, const char *res_name)
pci_resource_len(pdev, bar), res_name))
goto err_out;
}
-
+
+ dr = find_pci_dr(pdev);
+ if (dr)
+ dr->region_mask |= 1 << bar;
+
return 0;
err_out:
@@ -1144,7 +1259,15 @@ pci_intx(struct pci_dev *pdev, int enable)
}
if (new != pci_command) {
+ struct pci_devres *dr;
+
pci_write_config_word(pdev, PCI_COMMAND, new);
+
+ dr = find_pci_dr(pdev);
+ if (dr && !dr->restore_intx) {
+ dr->restore_intx = 1;
+ dr->orig_intx = !enable;
+ }
}
}
@@ -1226,6 +1349,8 @@ device_initcall(pci_init);
EXPORT_SYMBOL_GPL(pci_restore_bars);
EXPORT_SYMBOL(pci_enable_device_bars);
EXPORT_SYMBOL(pci_enable_device);
+EXPORT_SYMBOL(pcim_enable_device);
+EXPORT_SYMBOL(pcim_pin_device);
EXPORT_SYMBOL(pci_disable_device);
EXPORT_SYMBOL(pci_find_capability);
EXPORT_SYMBOL(pci_bus_find_capability);