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iommu/amd: Ratelimit io-page-faults per device 

Misbehaving devices can cause an endless chain of
io-page-faults, flooding dmesg and making the system-log
unusable or even prevent the system from booting.

So ratelimit the error messages about io-page-faults on a
per-device basis.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Joerg Roedel 2017-05-15 16:25:03 +02:00
parent 2ea659a9ef
commit 30bf2df65b
1 changed files with 33 additions and 7 deletions
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40
drivers/iommu/amd_iommu.c
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@ -138,6 +138,8 @@ struct iommu_dev_data {
PPR completions */
u32 errata; /* Bitmap for errata to apply */
bool use_vapic; /* Enable device to use vapic mode */
struct ratelimit_state rs; /* Ratelimit IOPF messages */
};
/*
@ -253,6 +255,8 @@ static struct iommu_dev_data *alloc_dev_data(u16 devid)
list_add_tail(&dev_data->dev_data_list, &dev_data_list);
spin_unlock_irqrestore(&dev_data_list_lock, flags);
ratelimit_default_init(&dev_data->rs);
return dev_data;
}
@ -551,6 +555,29 @@ static void dump_command(unsigned long phys_addr)
pr_err("AMD-Vi: CMD[%d]: %08x\n", i, cmd->data[i]);
}
static void amd_iommu_report_page_fault(u16 devid, u16 domain_id,
u64 address, int flags)
{
struct iommu_dev_data *dev_data = NULL;
struct pci_dev *pdev;
pdev = pci_get_bus_and_slot(PCI_BUS_NUM(devid), devid & 0xff);
if (pdev)
dev_data = get_dev_data(&pdev->dev);
if (dev_data && __ratelimit(&dev_data->rs)) {
dev_err(&pdev->dev, "AMD-Vi: Event logged [IO_PAGE_FAULT domain=0x%04x address=0x%016llx flags=0x%04x]\n",
domain_id, address, flags);
} else if (printk_ratelimit()) {
pr_err("AMD-Vi: Event logged [IO_PAGE_FAULT device=%02x:%02x.%x domain=0x%04x address=0x%016llx flags=0x%04x]\n",
PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid),
domain_id, address, flags);
}
if (pdev)
pci_dev_put(pdev);
}
static void iommu_print_event(struct amd_iommu *iommu, void *__evt)
{
int type, devid, domid, flags;
@ -575,7 +602,12 @@ retry:
goto retry;
}
printk(KERN_ERR "AMD-Vi: Event logged [");
if (type == EVENT_TYPE_IO_FAULT) {
amd_iommu_report_page_fault(devid, domid, address, flags);
return;
} else {
printk(KERN_ERR "AMD-Vi: Event logged [");
}
switch (type) {
case EVENT_TYPE_ILL_DEV:
@ -585,12 +617,6 @@ retry:
address, flags);
dump_dte_entry(devid);
break;
case EVENT_TYPE_IO_FAULT:
printk("IO_PAGE_FAULT device=%02x:%02x.%x "
"domain=0x%04x address=0x%016llx flags=0x%04x]\n",
PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid),
domid, address, flags);
break;
case EVENT_TYPE_DEV_TAB_ERR:
printk("DEV_TAB_HARDWARE_ERROR device=%02x:%02x.%x "
"address=0x%016llx flags=0x%04x]\n",