diff options
| author | Dan Williams <dan.j.williams@intel.com> | 2009-11-19 17:07:10 -0700 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2009-11-19 17:07:10 -0700 |
| commit | 228c4f5cfbf1cda411d9aa7204a612a63c89b1e8 (patch) | |
| tree | 0920f900732ce598fef2cdc0c4899860534e837d /drivers/dma/ioat/dma_v3.c | |
| parent | e22dde9904c2d26a522f1a2b89854a8238bf0933 (diff) | |
| download | lwn-228c4f5cfbf1cda411d9aa7204a612a63c89b1e8.tar.gz lwn-228c4f5cfbf1cda411d9aa7204a612a63c89b1e8.zip | |
ioat3: dca and raid operations are incompatible
RAID operations cause a system hang on platforms with DCA
(Direct-Cache-Access) enabled. So turn off RAID capabilities in this
case.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/dma/ioat/dma_v3.c')
| -rw-r--r-- | drivers/dma/ioat/dma_v3.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/dma/ioat/dma_v3.c b/drivers/dma/ioat/dma_v3.c index 35d1e33afd5b..4f305f61f878 100644 --- a/drivers/dma/ioat/dma_v3.c +++ b/drivers/dma/ioat/dma_v3.c @@ -1117,6 +1117,7 @@ static int __devinit ioat3_dma_self_test(struct ioatdma_device *device) int __devinit ioat3_dma_probe(struct ioatdma_device *device, int dca) { struct pci_dev *pdev = device->pdev; + int dca_en = system_has_dca_enabled(pdev); struct dma_device *dma; struct dma_chan *c; struct ioat_chan_common *chan; @@ -1137,6 +1138,11 @@ int __devinit ioat3_dma_probe(struct ioatdma_device *device, int dca) dma->device_prep_dma_interrupt = ioat3_prep_interrupt_lock; cap = readl(device->reg_base + IOAT_DMA_CAP_OFFSET); + + /* dca is incompatible with raid operations */ + if (dca_en && (cap & (IOAT_CAP_XOR|IOAT_CAP_PQ))) + cap &= ~(IOAT_CAP_XOR|IOAT_CAP_PQ); + if (cap & IOAT_CAP_XOR) { is_raid_device = true; dma->max_xor = 8; |