Commit 37448adf authored by Lance Ortiz's avatar Lance Ortiz Committed by Tony Luck
Browse files

aerdrv: Move cper_print_aer() call out of interrupt context 



The following warning was seen on 3.9 when a corrected PCIe error was being
handled by the AER subsystem.

WARNING: at .../drivers/pci/search.c:214 pci_get_dev_by_id+0x8a/0x90()

This occurred because a call to pci_get_domain_bus_and_slot() was added to
cper_print_pcie() to setup for the call to cper_print_aer().  The warning
showed up because cper_print_pcie() is called in an interrupt context and
pci_get* functions are not supposed to be called in that context.

The solution is to move the cper_print_aer() call out of the interrupt
context and into aer_recover_work_func() to avoid any warnings when calling
pci_get* functions.

Signed-off-by: default avatarLance Ortiz <lance.ortiz@hp.com>
Acked-by: default avatarBorislav Petkov <bp@suse.de>
Acked-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
parent e4aa937e

drivers/acpi/apei/cper.c

+0 −18
Original line number Diff line number Diff line
@@ -250,10 +250,6 @@ static const char *cper_pcie_port_type_strs[] = { 
static void cper_print_pcie(const char *pfx, const struct cper_sec_pcie *pcie,

			    const struct acpi_hest_generic_data *gdata)

{

#ifdef CONFIG_ACPI_APEI_PCIEAER

	struct pci_dev *dev;

#endif



	if (pcie->validation_bits & CPER_PCIE_VALID_PORT_TYPE)

		printk("%s""port_type: %d, %s\n", pfx, pcie->port_type,

		       pcie->port_type < ARRAY_SIZE(cper_pcie_port_type_strs) ?
@@ -285,20 +281,6 @@ static void cper_print_pcie(const char *pfx, const struct cper_sec_pcie *pcie, 
		printk(

	"%s""bridge: secondary_status: 0x%04x, control: 0x%04x\n",

	pfx, pcie->bridge.secondary_status, pcie->bridge.control);

#ifdef CONFIG_ACPI_APEI_PCIEAER

	dev = pci_get_domain_bus_and_slot(pcie->device_id.segment,

			pcie->device_id.bus, pcie->device_id.function);

	if (!dev) {

		pr_err("PCI AER Cannot get PCI device %04x:%02x:%02x.%d\n",

			pcie->device_id.segment, pcie->device_id.bus,

			pcie->device_id.slot, pcie->device_id.function);

		return;

	}

	if (pcie->validation_bits & CPER_PCIE_VALID_AER_INFO)

		cper_print_aer(pfx, dev, gdata->error_severity,

				(struct aer_capability_regs *) pcie->aer_info);

	pci_dev_put(dev);

#endif

}



static const char *apei_estatus_section_flag_strs[] = {

drivers/acpi/apei/ghes.c

+3 −1
Original line number Diff line number Diff line
@@ -454,7 +454,9 @@ static void ghes_do_proc(struct ghes *ghes, 
				aer_severity = cper_severity_to_aer(sev);

				aer_recover_queue(pcie_err->device_id.segment,

						  pcie_err->device_id.bus,

						  devfn, aer_severity);

						  devfn, aer_severity,

						  (struct aer_capability_regs *)

						  pcie_err->aer_info);

			}



		}

drivers/pci/pcie/aer/aerdrv_core.c

+4 −1
Original line number Diff line number Diff line
@@ -580,6 +580,7 @@ struct aer_recover_entry 
	u8	devfn;

	u16	domain;

	int	severity;

	struct aer_capability_regs *regs;

};



static DEFINE_KFIFO(aer_recover_ring, struct aer_recover_entry,
@@ -593,7 +594,7 @@ static DEFINE_SPINLOCK(aer_recover_ring_lock); 
static DECLARE_WORK(aer_recover_work, aer_recover_work_func);



void aer_recover_queue(int domain, unsigned int bus, unsigned int devfn,

		       int severity)

		       int severity, struct aer_capability_regs *aer_regs)

{

	unsigned long flags;

	struct aer_recover_entry entry = {
@@ -601,6 +602,7 @@ void aer_recover_queue(int domain, unsigned int bus, unsigned int devfn, 
		.devfn		= devfn,

		.domain		= domain,

		.severity	= severity,

		.regs		= aer_regs,

	};



	spin_lock_irqsave(&aer_recover_ring_lock, flags);
@@ -627,6 +629,7 @@ static void aer_recover_work_func(struct work_struct *work) 
			       PCI_SLOT(entry.devfn), PCI_FUNC(entry.devfn));

			continue;

		}

		cper_print_aer(pdev, entry.severity, entry.regs);

		do_recovery(pdev, entry.severity);

		pci_dev_put(pdev);

	}

drivers/pci/pcie/aer/aerdrv_errprint.c

+2 −2
Original line number Diff line number Diff line
@@ -220,7 +220,7 @@ int cper_severity_to_aer(int cper_severity) 
}

EXPORT_SYMBOL_GPL(cper_severity_to_aer);



void cper_print_aer(const char *prefix, struct pci_dev *dev, int cper_severity,

void cper_print_aer(struct pci_dev *dev, int cper_severity,

		    struct aer_capability_regs *aer)

{

	int aer_severity, layer, agent, status_strs_size, tlp_header_valid = 0;
@@ -244,7 +244,7 @@ void cper_print_aer(const char *prefix, struct pci_dev *dev, int cper_severity, 
	agent = AER_GET_AGENT(aer_severity, status);

	dev_err(&dev->dev, "aer_status: 0x%08x, aer_mask: 0x%08x\n",

	       status, mask);

	cper_print_bits(prefix, status, status_strs, status_strs_size);

	cper_print_bits("", status, status_strs, status_strs_size);

	dev_err(&dev->dev, "aer_layer=%s, aer_agent=%s\n",

	       aer_error_layer[layer], aer_agent_string[agent]);

	if (aer_severity != AER_CORRECTABLE)

include/linux/aer.h

+3 −2
Original line number Diff line number Diff line
@@ -49,10 +49,11 @@ static inline int pci_cleanup_aer_uncorrect_error_status(struct pci_dev *dev) 
}

#endif



extern void cper_print_aer(const char *prefix, struct pci_dev *dev,

extern void cper_print_aer(struct pci_dev *dev,

			   int cper_severity, struct aer_capability_regs *aer);

extern int cper_severity_to_aer(int cper_severity);

extern void aer_recover_queue(int domain, unsigned int bus, unsigned int devfn,

			      int severity);

			      int severity,

			      struct aer_capability_regs *aer_regs);

#endif //_AER_H_

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