From d5351256ff4640ae8a4e82355a5bd8c2260601ec Mon Sep 17 00:00:00 2001 From: Keith Busch Date: Mon, 27 Jul 2020 11:10:58 -0400 Subject: [PATCH 1989/2944] PCI/AER: Abstract AER interrupt handling task #29600094 commit 390e2db8248075ae2f31a7046a88eda0f9784310 upstream. Backport summary: for 4.19 kernel ICX PCIe Gen4 support. 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 Signed-off-by: Bjorn Helgaas (cherry picked from commit 390e2db8248075ae2f31a7046a88eda0f9784310) Signed-off-by: Ethan Zhao Signed-off-by: Artie Ding Acked-by: Caspar Zhang --- drivers/pci/pcie/aer.c | 3 +-- drivers/pci/pcie/aer_inject.c | 5 ++++- drivers/pci/pcie/portdrv.h | 4 ---- 3 files changed, 5 insertions(+), 7 deletions(-) diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c index 90b53ab..a90a919 100644 --- a/drivers/pci/pcie/aer.c +++ b/drivers/pci/pcie/aer.c @@ -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) { diff --git a/drivers/pci/pcie/aer_inject.c b/drivers/pci/pcie/aer_inject.c index f40ed58..726987f 100644 --- a/drivers/pci/pcie/aer_inject.c +++ b/drivers/pci/pcie/aer_inject.c @@ -14,6 +14,7 @@ #include #include +#include #include #include #include @@ -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; diff --git a/drivers/pci/pcie/portdrv.h b/drivers/pci/pcie/portdrv.h index 2498b2d..55fe9f7 100644 --- a/drivers/pci/pcie/portdrv.h +++ b/drivers/pci/pcie/portdrv.h @@ -147,10 +147,6 @@ 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); -- 1.8.3.1