Re: [RESEND][PATCH 07/10][SCSI]mpt2sas: Added Reply Descriptor Post Queue (RDPQ) Array support

Martin K. Petersen
2014-07-23T19:47:10Z

>>>>> "Sreekanth" == Sreekanth Reddy <sreekanth.reddy@avagotech.com> writes:

Sreekanth,

Sreekanth> 2. As per MPI Spec, each set of 8 reply descriptor post
Sreekanth> queues must have the same value for the upper 32-bits of
Sreekanth> their memory address. So allocated set of eight queues in a
Sreekanth> single pool and added a new function is_MSB_are_same() to
Sreekanth> check whether higher 32 bits of this pool memory address are
Sreekanth> same or not. If this functions returns zero then we are
Sreekanth> saving these pools in the bad_reply_post_pool list. then
Sreekanth> releasing these pools once we get the required memory pools.

Why don't you just set pci_set_consistent_dma_mask() to DMA_BIT_MASK(32)
before you allocate the queue entries?

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Martin K. Petersen Oracle Linux Engineering