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Code Issues Releases Wiki Activity

PCI/DPC: Defer event handling to work queue

Browse source 
Move all event handling to the existing work queue, which will
make it simpler to pass event information to the handler.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Sinan Kaya <okaya@kernel.org>
Reviewed-by: Oza Pawandeep <poza@codeaurora.org>
This commit is contained in:
Keith Busch 2018-07-16 17:05:02 -05:00 committed by Bjorn Helgaas
parent f8d46c89c8
commit 0c27e28f77
1 changed files with 20 additions and 24 deletions
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44
drivers/pci/pcie/dpc.c
View file

@ -108,14 +108,6 @@ static pci_ers_result_t dpc_reset_link(struct pci_dev *pdev)
return PCI_ERS_RESULT_RECOVERED;
}
static void dpc_work(struct work_struct *work)
{
struct dpc_dev *dpc = container_of(work, struct dpc_dev, work);
struct pci_dev *pdev = dpc->dev->port;
/* We configure DPC so it only triggers on ERR_FATAL */
pcie_do_fatal_recovery(pdev, PCIE_PORT_SERVICE_DPC);
}
static void dpc_process_rp_pio_error(struct dpc_dev *dpc)
{
@ -174,33 +166,21 @@ static void dpc_process_rp_pio_error(struct dpc_dev *dpc)
}
}
static irqreturn_t dpc_irq(int irq, void *context)
static void dpc_work(struct work_struct *work)
{
struct dpc_dev *dpc = (struct dpc_dev *)context;
struct dpc_dev *dpc = container_of(work, struct dpc_dev, work);
struct pci_dev *pdev = dpc->dev->port;
struct device *dev = &dpc->dev->device;
u16 cap = dpc->cap_pos, status, source, reason, ext_reason;
pci_read_config_word(pdev, cap + PCI_EXP_DPC_STATUS, &status);
if (!(status & PCI_EXP_DPC_STATUS_INTERRUPT) || status == (u16)(~0))
return IRQ_NONE;
if (!(status & PCI_EXP_DPC_STATUS_TRIGGER)) {
pci_write_config_word(pdev, cap + PCI_EXP_DPC_STATUS,
PCI_EXP_DPC_STATUS_INTERRUPT);
return IRQ_HANDLED;
}
pci_read_config_word(pdev, cap + PCI_EXP_DPC_SOURCE_ID,
&source);
pci_read_config_word(pdev, cap + PCI_EXP_DPC_SOURCE_ID, &source);
dev_info(dev, "DPC containment event, status:%#06x source:%#06x\n",
status, source);
status, source);
reason = (status & PCI_EXP_DPC_STATUS_TRIGGER_RSN) >> 1;
ext_reason = (status & PCI_EXP_DPC_STATUS_TRIGGER_RSN_EXT) >> 5;
dev_warn(dev, "DPC %s detected, remove downstream devices\n",
(reason == 0) ? "unmasked uncorrectable error" :
(reason == 1) ? "ERR_NONFATAL" :
@ -208,10 +188,26 @@ static irqreturn_t dpc_irq(int irq, void *context)
(ext_reason == 0) ? "RP PIO error" :
(ext_reason == 1) ? "software trigger" :
"reserved error");
/* show RP PIO error detail information */
if (dpc->rp_extensions && reason == 3 && ext_reason == 0)
dpc_process_rp_pio_error(dpc);
/* We configure DPC so it only triggers on ERR_FATAL */
pcie_do_fatal_recovery(pdev, PCIE_PORT_SERVICE_DPC);
}
static irqreturn_t dpc_irq(int irq, void *context)
{
struct dpc_dev *dpc = (struct dpc_dev *)context;
struct pci_dev *pdev = dpc->dev->port;
u16 cap = dpc->cap_pos, status;
pci_read_config_word(pdev, cap + PCI_EXP_DPC_STATUS, &status);
if (!(status & PCI_EXP_DPC_STATUS_INTERRUPT) || status == (u16)(~0))
return IRQ_NONE;
pci_write_config_word(pdev, cap + PCI_EXP_DPC_STATUS,
PCI_EXP_DPC_STATUS_INTERRUPT);
if (status & PCI_EXP_DPC_STATUS_TRIGGER)