From 14d0f0b063f5363984dd305a792854f9c23e9e97 Mon Sep 17 00:00:00 2001 From: "Kashyap, Desai" Date: Fri, 29 May 2009 16:37:04 +0530 Subject: [SCSI] mpt fusion: Fixing 1078 data corruption issue for 36GB memory region The reason for this change is there is a data corruption when four different physical memory regions in the 36GB to 37GB region are accessed. This is only affecting 1078. The solution is we need to use different addressing when filling in the scatter gather table for the effected memory regions. So instead of snooping on all four different memory holes, we treat any physical addresses in the 36GB address with the same algorithm. The fix is explained below 1) Ensure that the message frames are NOT located in the trouble region. There is no remapping available for message frames, they must be allocated outside the problem region. 2) Ensure that Sense buffers are NOT in the trouble region. There is no remapping available. 3) Walk through the SGE entries and if any are inside the trouble region then they need to be remapped as discussed below. 1) Set the Local Address bit in the SGE Flags field. MPI_SGE_FLAGS_LOCAL_ADDRESS 2) Ensure we are using 64-bit SGEs 3) Set MSb (Bit 63) of the 64-bit address, this will indicate buffer location is Host Memory. Signed-off-by: Kashyap Desai Signed-off-by: James Bottomley --- drivers/message/fusion/mptfc.c | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-) (limited to 'drivers/message/fusion/mptfc.c') diff --git a/drivers/message/fusion/mptfc.c b/drivers/message/fusion/mptfc.c index c3c24fdf9fb6..da16b47a3f32 100644 --- a/drivers/message/fusion/mptfc.c +++ b/drivers/message/fusion/mptfc.c @@ -1251,17 +1251,15 @@ mptfc_probe(struct pci_dev *pdev, const struct pci_device_id *id) * A slightly different algorithm is required for * 64bit SGEs. */ - scale = ioc->req_sz/(sizeof(dma_addr_t) + sizeof(u32)); - if (sizeof(dma_addr_t) == sizeof(u64)) { + scale = ioc->req_sz/ioc->SGE_size; + if (ioc->sg_addr_size == sizeof(u64)) { numSGE = (scale - 1) * (ioc->facts.MaxChainDepth-1) + scale + - (ioc->req_sz - 60) / (sizeof(dma_addr_t) + - sizeof(u32)); + (ioc->req_sz - 60) / ioc->SGE_size; } else { numSGE = 1 + (scale - 1) * (ioc->facts.MaxChainDepth-1) + scale + - (ioc->req_sz - 64) / (sizeof(dma_addr_t) + - sizeof(u32)); + (ioc->req_sz - 64) / ioc->SGE_size; } if (numSGE < sh->sg_tablesize) { -- cgit v1.2.2