drivers/pci/pcie/err.c

Source file repositories/reference/linux-study-clean/drivers/pci/pcie/err.c

File Facts

System
Linux kernel
Corpus path
drivers/pci/pcie/err.c
Extension
.c
Size
8410 bytes
Lines
300
Domain
Representative Device Path
Bucket
PCIe NVMe Storage Path
Inferred role
Representative Device Path: operation-table or driver-model contract
Status
pattern implementation candidate

Why This File Exists

Part of the selected hardware vertical slice: PCI discovery, driver binding, NVMe queues, block requests, DMA, interrupts, and completion.

Dependency Surface

Detected Declarations

Annotated Snippet

struct pci_driver *pdrv;
	pci_ers_result_t vote;
	const struct pci_error_handlers *err_handler;

	device_lock(&dev->dev);
	pdrv = dev->driver;
	if (pci_dev_is_disconnected(dev)) {
		vote = PCI_ERS_RESULT_DISCONNECT;
	} else if (!pci_dev_set_io_state(dev, state)) {
		pci_info(dev, "can't recover (state transition %u -> %u invalid)\n",
			dev->error_state, state);
		vote = PCI_ERS_RESULT_NONE;
	} else if (!pdrv || !pdrv->err_handler ||
		   !pdrv->err_handler->error_detected) {
		/*
		 * If any device in the subtree does not have an error_detected
		 * callback, PCI_ERS_RESULT_NO_AER_DRIVER prevents subsequent
		 * error callbacks of "any" device in the subtree, and will
		 * exit in the disconnected error state.
		 */
		if (dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
			vote = PCI_ERS_RESULT_NO_AER_DRIVER;
			pci_info(dev, "can't recover (no error_detected callback)\n");
		} else {
			vote = PCI_ERS_RESULT_NONE;
		}
	} else {
		err_handler = pdrv->err_handler;
		vote = err_handler->error_detected(dev, state);
	}
	pci_uevent_ers(dev, vote);
	*result = merge_result(*result, vote);
	device_unlock(&dev->dev);
	return 0;
}

static int pci_pm_runtime_get_sync(struct pci_dev *pdev, void *data)
{
	pm_runtime_get_sync(&pdev->dev);
	return 0;
}

static int pci_pm_runtime_put(struct pci_dev *pdev, void *data)
{
	pm_runtime_put(&pdev->dev);
	return 0;
}

static int report_frozen_detected(struct pci_dev *dev, void *data)
{
	return report_error_detected(dev, pci_channel_io_frozen, data);
}

static int report_normal_detected(struct pci_dev *dev, void *data)
{
	return report_error_detected(dev, pci_channel_io_normal, data);
}

static int report_perm_failure_detected(struct pci_dev *dev, void *data)
{
	struct pci_driver *pdrv;
	const struct pci_error_handlers *err_handler;

	device_lock(&dev->dev);
	pdrv = dev->driver;
	if (!pdrv || !pdrv->err_handler || !pdrv->err_handler->error_detected)
		goto out;

	err_handler = pdrv->err_handler;
	err_handler->error_detected(dev, pci_channel_io_perm_failure);
out:
	pci_uevent_ers(dev, PCI_ERS_RESULT_DISCONNECT);
	device_unlock(&dev->dev);
	return 0;
}

static int report_mmio_enabled(struct pci_dev *dev, void *data)
{
	struct pci_driver *pdrv;
	pci_ers_result_t vote, *result = data;
	const struct pci_error_handlers *err_handler;

	device_lock(&dev->dev);
	pdrv = dev->driver;
	if (!pdrv || !pdrv->err_handler || !pdrv->err_handler->mmio_enabled)
		goto out;

	err_handler = pdrv->err_handler;
	vote = err_handler->mmio_enabled(dev);
	*result = merge_result(*result, vote);

Annotation

Implementation Notes