diff options
author | Dave Jiang <dave.jiang@intel.com> | 2015-08-26 22:17:30 +0200 |
---|---|---|
committer | Vinod Koul <vinod.koul@intel.com> | 2015-09-21 17:40:05 +0200 |
commit | 4222a9074339fccc59526cbf30d8d2ec41468574 (patch) | |
tree | 60c072474058d21babc7d7ee86e66efe78844d7b /drivers/dma | |
parent | dmaengine: ioatdma: adding shutdown support (diff) | |
download | linux-4222a9074339fccc59526cbf30d8d2ec41468574.tar.xz linux-4222a9074339fccc59526cbf30d8d2ec41468574.zip |
dmaengine: ioatdma: add PCIe AER handlers
Adding AER handlers in order to handle any PCIe errors.
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma')
-rw-r--r-- | drivers/dma/ioat/init.c | 88 |
1 files changed, 86 insertions, 2 deletions
diff --git a/drivers/dma/ioat/init.c b/drivers/dma/ioat/init.c index 793c5dd6a0e7..4ef0c5e07912 100644 --- a/drivers/dma/ioat/init.c +++ b/drivers/dma/ioat/init.c @@ -27,6 +27,7 @@ #include <linux/workqueue.h> #include <linux/prefetch.h> #include <linux/dca.h> +#include <linux/aer.h> #include "dma.h" #include "registers.h" #include "hw.h" @@ -1211,14 +1212,91 @@ static void ioat_shutdown(struct pci_dev *pdev) ioat_disable_interrupts(ioat_dma); } +void ioat_resume(struct ioatdma_device *ioat_dma) +{ + struct ioatdma_chan *ioat_chan; + u32 chanerr; + int i; + + for (i = 0; i < IOAT_MAX_CHANS; i++) { + ioat_chan = ioat_dma->idx[i]; + if (!ioat_chan) + continue; + + spin_lock_bh(&ioat_chan->prep_lock); + clear_bit(IOAT_CHAN_DOWN, &ioat_chan->state); + spin_unlock_bh(&ioat_chan->prep_lock); + + chanerr = readl(ioat_chan->reg_base + IOAT_CHANERR_OFFSET); + writel(chanerr, ioat_chan->reg_base + IOAT_CHANERR_OFFSET); + + /* no need to reset as shutdown already did that */ + } +} + #define DRV_NAME "ioatdma" +static pci_ers_result_t ioat_pcie_error_detected(struct pci_dev *pdev, + enum pci_channel_state error) +{ + dev_dbg(&pdev->dev, "%s: PCIe AER error %d\n", DRV_NAME, error); + + /* quiesce and block I/O */ + ioat_shutdown(pdev); + + return PCI_ERS_RESULT_NEED_RESET; +} + +static pci_ers_result_t ioat_pcie_error_slot_reset(struct pci_dev *pdev) +{ + pci_ers_result_t result = PCI_ERS_RESULT_RECOVERED; + int err; + + dev_dbg(&pdev->dev, "%s post reset handling\n", DRV_NAME); + + if (pci_enable_device_mem(pdev) < 0) { + dev_err(&pdev->dev, + "Failed to enable PCIe device after reset.\n"); + result = PCI_ERS_RESULT_DISCONNECT; + } else { + pci_set_master(pdev); + pci_restore_state(pdev); + pci_save_state(pdev); + pci_wake_from_d3(pdev, false); + } + + err = pci_cleanup_aer_uncorrect_error_status(pdev); + if (err) { + dev_err(&pdev->dev, + "AER uncorrect error status clear failed: %#x\n", err); + } + + return result; +} + +static void ioat_pcie_error_resume(struct pci_dev *pdev) +{ + struct ioatdma_device *ioat_dma = pci_get_drvdata(pdev); + + dev_dbg(&pdev->dev, "%s: AER handling resuming\n", DRV_NAME); + + /* initialize and bring everything back */ + ioat_resume(ioat_dma); +} + +static const struct pci_error_handlers ioat_err_handler = { + .error_detected = ioat_pcie_error_detected, + .slot_reset = ioat_pcie_error_slot_reset, + .resume = ioat_pcie_error_resume, +}; + static struct pci_driver ioat_pci_driver = { .name = DRV_NAME, .id_table = ioat_pci_tbl, .probe = ioat_pci_probe, .remove = ioat_remove, .shutdown = ioat_shutdown, + .err_handler = &ioat_err_handler, }; static struct ioatdma_device * @@ -1271,13 +1349,17 @@ static int ioat_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) pci_set_drvdata(pdev, device); device->version = readb(device->reg_base + IOAT_VER_OFFSET); - if (device->version >= IOAT_VER_3_0) + if (device->version >= IOAT_VER_3_0) { err = ioat3_dma_probe(device, ioat_dca_enabled); - else + + if (device->version >= IOAT_VER_3_3) + pci_enable_pcie_error_reporting(pdev); + } else return -ENODEV; if (err) { dev_err(dev, "Intel(R) I/OAT DMA Engine init failed\n"); + pci_disable_pcie_error_reporting(pdev); return -ENODEV; } @@ -1297,6 +1379,8 @@ static void ioat_remove(struct pci_dev *pdev) free_dca_provider(device->dca); device->dca = NULL; } + + pci_disable_pcie_error_reporting(pdev); ioat_dma_remove(device); } |