diff options
| author | Mike Miller <mike.miller@hp.com> | 2006-12-06 20:35:04 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.osdl.org> | 2006-12-07 08:39:29 -0800 |
| commit | f92e2f5f889803306e50c06e17ee330403e91b8d (patch) | |
| tree | 0971abf513da37eba31de1aa8d7753aa2e5fa8b7 /drivers | |
| parent | de9239167158c0210c5b9a709d67cea1b6f8ae56 (diff) | |
[PATCH] cciss: disable DMA prefetch on P600
Unconditionally disable DMA prefetch on the P600 controller. An ASIC bug may
result in prefetching beyond the end of physical memory.
Signed-off-by: Mike Miller <mike.miller@hp.com>
Acked-by: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/block/cciss.c | 11 | ||||
| -rw-r--r-- | drivers/block/cciss_cmd.h | 1 |
2 files changed, 12 insertions, 0 deletions
diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c index 4899ab27f78..a17223c43ae 100644 --- a/drivers/block/cciss.c +++ b/drivers/block/cciss.c @@ -3003,6 +3003,17 @@ static int cciss_pci_init(ctlr_info_t *c, struct pci_dev *pdev) } #endif + /* Disabling DMA prefetch for the P600 + * An ASIC bug may result in a prefetch beyond + * physical memory. + */ + if(board_id == 0x3225103C) { + __u32 dma_prefetch; + dma_prefetch = readl(c->vaddr + I2O_DMA1_CFG); + dma_prefetch |= 0x8000; + writel(dma_prefetch, c->vaddr + I2O_DMA1_CFG); + } + #ifdef CCISS_DEBUG printk("Trying to put board into Simple mode\n"); #endif /* CCISS_DEBUG */ diff --git a/drivers/block/cciss_cmd.h b/drivers/block/cciss_cmd.h index 4af7c4c0c7a..b2147cca5ac 100644 --- a/drivers/block/cciss_cmd.h +++ b/drivers/block/cciss_cmd.h @@ -55,6 +55,7 @@ #define I2O_INT_MASK 0x34 #define I2O_IBPOST_Q 0x40 #define I2O_OBPOST_Q 0x44 +#define I2O_DMA1_CFG 0x214 //Configuration Table #define CFGTBL_ChangeReq 0x00000001l |