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PCI/DPC: Use threaded IRQ for bottom half handling

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Remove the work struct that was being used to handle a DPC event and use a
threaded IRQ instead.

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 17:05:06 -05:00 committed by Bjorn Helgaas
parent 8aefa9b0d9
commit 738c4e411d
1 changed files with 8 additions and 7 deletions
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15
drivers/pci/pcie/dpc.c
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@ -17,7 +17,6 @@
struct dpc_dev { struct dpc_dev {
struct pcie_device *dev; struct pcie_device *dev;
struct work_struct work;
u16 cap_pos; u16 cap_pos;
bool rp_extensions; bool rp_extensions;
u8 rp_log_size; u8 rp_log_size;
@ -160,10 +159,10 @@ static void dpc_process_rp_pio_error(struct dpc_dev *dpc)
pci_write_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_STATUS, status); pci_write_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_STATUS, status);
} }
static void dpc_work(struct work_struct *work) static irqreturn_t dpc_handler(int irq, void *context)
{ {
struct aer_err_info info; struct aer_err_info info;
struct dpc_dev *dpc = container_of(work, struct dpc_dev, work); struct dpc_dev *dpc = context;
struct pci_dev *pdev = dpc->dev->port; struct pci_dev *pdev = dpc->dev->port;
struct device *dev = &dpc->dev->device; struct device *dev = &dpc->dev->device;
u16 cap = dpc->cap_pos, status, source, reason, ext_reason; u16 cap = dpc->cap_pos, status, source, reason, ext_reason;
@ -194,6 +193,8 @@ static void dpc_work(struct work_struct *work)
/* We configure DPC so it only triggers on ERR_FATAL */ /* We configure DPC so it only triggers on ERR_FATAL */
pcie_do_fatal_recovery(pdev, PCIE_PORT_SERVICE_DPC); pcie_do_fatal_recovery(pdev, PCIE_PORT_SERVICE_DPC);
return IRQ_HANDLED;
} }
static irqreturn_t dpc_irq(int irq, void *context) static irqreturn_t dpc_irq(int irq, void *context)
@ -210,7 +211,7 @@ static irqreturn_t dpc_irq(int irq, void *context)
pci_write_config_word(pdev, cap + PCI_EXP_DPC_STATUS, pci_write_config_word(pdev, cap + PCI_EXP_DPC_STATUS,
PCI_EXP_DPC_STATUS_INTERRUPT); PCI_EXP_DPC_STATUS_INTERRUPT);
if (status & PCI_EXP_DPC_STATUS_TRIGGER) if (status & PCI_EXP_DPC_STATUS_TRIGGER)
schedule_work(&dpc->work); return IRQ_WAKE_THREAD;
return IRQ_HANDLED; return IRQ_HANDLED;
} }
@ -232,11 +233,11 @@ static int dpc_probe(struct pcie_device *dev)
dpc->cap_pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_DPC); dpc->cap_pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_DPC);
dpc->dev = dev; dpc->dev = dev;
INIT_WORK(&dpc->work, dpc_work);
set_service_data(dev, dpc); set_service_data(dev, dpc);
status = devm_request_irq(device, dev->irq, dpc_irq, IRQF_SHARED, status = devm_request_threaded_irq(device, dev->irq, dpc_irq,
"pcie-dpc", dpc); dpc_handler, IRQF_SHARED,
"pcie-dpc", dpc);
if (status) { if (status) {
dev_warn(device, "request IRQ%d failed: %d\n", dev->irq, dev_warn(device, "request IRQ%d failed: %d\n", dev->irq,
status); status);