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PCI/AER: Abstract AER interrupt handling

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The aer_inject module was directly calling aer_irq().  This required the
AER driver export its private IRQ handler for no other reason than to
support error injection.  A driver should not have to expose its private
interfaces, so use the IRQ subsystem to route injection to the AER driver,
and make aer_irq() a private interface.

This provides additional benefits:

First, directly calling the IRQ handler bypassed the IRQ subsytem so the
injection wasn't really synthesizing what happens if a shared AER interrupt
occurs.

The error injection had to provide the callback data directly, which may be
racing with a removal that is freeing that structure.  The IRQ subsystem
can handle that race.

Finally, using the IRQ subsystem automatically reacts to threaded IRQs,
keeping the error injection abstracted from that implementation detail.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Keith Busch 2018-10-11 12:34:11 -06:00 committed by Bjorn Helgaas
parent 0e98db259f
commit 390e2db824
3 changed files with 5 additions and 7 deletions
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3
drivers/pci/pcie/aer.c
View File

@ -1229,7 +1229,7 @@ static irqreturn_t aer_isr(int irq, void *context)
*
* Invoked when Root Port detects AER messages.
*/
irqreturn_t aer_irq(int irq, void *context)
static irqreturn_t aer_irq(int irq, void *context)
{
struct pcie_device *pdev = (struct pcie_device *)context;
struct aer_rpc *rpc = get_service_data(pdev);
@ -1249,7 +1249,6 @@ irqreturn_t aer_irq(int irq, void *context)
return IRQ_WAKE_THREAD;
}
EXPORT_SYMBOL_GPL(aer_irq);
static int set_device_error_reporting(struct pci_dev *dev, void *data)
{

5
drivers/pci/pcie/aer_inject.c
View File

@ -14,6 +14,7 @@
#include <linux/module.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/miscdevice.h>
#include <linux/pci.h>
#include <linux/slab.h>
@ -457,7 +458,9 @@ static int aer_inject(struct aer_error_inj *einj)
dev_info(&edev->device,
"aer_inject: Injecting errors %08x/%08x into device %s\n",
einj->cor_status, einj->uncor_status, pci_name(dev));
aer_irq(-1, edev);
local_irq_disable();
generic_handle_irq(edev->irq);
local_irq_enable();
} else {
pci_err(rpdev, "aer_inject: AER device not found\n");
ret = -ENODEV;

4
drivers/pci/pcie/portdrv.h
View File

@ -151,10 +151,6 @@ static inline int pcie_aer_get_firmware_first(struct pci_dev *pci_dev)
}
#endif
#ifdef CONFIG_PCIEAER
irqreturn_t aer_irq(int irq, void *context);
#endif
struct pcie_port_service_driver *pcie_port_find_service(struct pci_dev *dev,
u32 service);
struct device *pcie_port_find_device(struct pci_dev *dev, u32 service);