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Merge branch 'pci/dpc' into next

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* pci/dpc:
  PCI/DPC: Wait for Root Port busy to clear
  PCI/DPC: Decode extended reasons
This commit is contained in:
Bjorn Helgaas 2017-02-15 11:56:07 -06:00
commit af3a2ab5da
2 changed files with 32 additions and 3 deletions
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34
drivers/pci/pcie/pcie-dpc.c
View File

@ -19,8 +19,28 @@ struct dpc_dev {
struct pcie_device *dev;
struct work_struct work;
int cap_pos;
bool rp;
};
static int dpc_wait_rp_inactive(struct dpc_dev *dpc)
{
unsigned long timeout = jiffies + HZ;
struct pci_dev *pdev = dpc->dev->port;
u16 status;
pci_read_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_STATUS, &status);
while (status & PCI_EXP_DPC_RP_BUSY &&
!time_after(jiffies, timeout)) {
msleep(10);
pci_read_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_STATUS, &status);
}
if (status & PCI_EXP_DPC_RP_BUSY) {
dev_warn(&pdev->dev, "DPC root port still busy\n");
return -EBUSY;
}
return 0;
}
static void dpc_wait_link_inactive(struct pci_dev *pdev)
{
unsigned long timeout = jiffies + HZ;
@ -33,7 +53,7 @@ static void dpc_wait_link_inactive(struct pci_dev *pdev)
pcie_capability_read_word(pdev, PCI_EXP_LNKSTA, &lnk_status);
}
if (lnk_status & PCI_EXP_LNKSTA_DLLLA)
dev_warn(&pdev->dev, "Link state not disabled for DPC event");
dev_warn(&pdev->dev, "Link state not disabled for DPC event\n");
}
static void interrupt_event_handler(struct work_struct *work)
@ -52,6 +72,8 @@ static void interrupt_event_handler(struct work_struct *work)
pci_unlock_rescan_remove();
dpc_wait_link_inactive(pdev);
if (dpc->rp && dpc_wait_rp_inactive(dpc))
return;
pci_write_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_STATUS,
PCI_EXP_DPC_STATUS_TRIGGER | PCI_EXP_DPC_STATUS_INTERRUPT);
}
@ -73,11 +95,15 @@ static irqreturn_t dpc_irq(int irq, void *context)
if (status & PCI_EXP_DPC_STATUS_TRIGGER) {
u16 reason = (status >> 1) & 0x3;
u16 ext_reason = (status >> 5) & 0x3;
dev_warn(&dpc->dev->device, "DPC %s triggered, remove downstream devices\n",
dev_warn(&dpc->dev->device, "DPC %s detected, remove downstream devices\n",
(reason == 0) ? "unmasked uncorrectable error" :
(reason == 1) ? "ERR_NONFATAL" :
(reason == 2) ? "ERR_FATAL" : "extended error");
(reason == 2) ? "ERR_FATAL" :
(ext_reason == 0) ? "RP PIO error" :
(ext_reason == 1) ? "software trigger" :
"reserved error");
schedule_work(&dpc->work);
}
return IRQ_HANDLED;
@ -111,6 +137,8 @@ static int dpc_probe(struct pcie_device *dev)
pci_read_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_CAP, &cap);
pci_read_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_CTL, &ctl);
dpc->rp = (cap & PCI_EXP_DPC_CAP_RP_EXT);
ctl |= PCI_EXP_DPC_CTL_EN_NONFATAL | PCI_EXP_DPC_CTL_INT_EN;
pci_write_config_word(pdev, dpc->cap_pos + PCI_EXP_DPC_CTL, ctl);

1
include/uapi/linux/pci_regs.h
View File

@ -974,6 +974,7 @@
#define PCI_EXP_DPC_STATUS 8 /* DPC Status */
#define PCI_EXP_DPC_STATUS_TRIGGER 0x01 /* Trigger Status */
#define PCI_EXP_DPC_STATUS_INTERRUPT 0x08 /* Interrupt Status */
#define PCI_EXP_DPC_RP_BUSY 0x10 /* Root Port Busy */
#define PCI_EXP_DPC_SOURCE_ID 10 /* DPC Source Identifier */