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scsi: mpt3sas: Lockless access for chain buffers.

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Introduces Chain lookup table/tracker and implements accessing chain
buffer using smid.  Removed link list based access of chain buffer which
requires lock and allocated as many chains needed.

Signed-off-by: Chaitra P B <chaitra.basappa@broadcom.com>
Signed-off-by: Suganath Prabu S <suganath-prabu.subramani@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Chaitra P B
2018-04-24 05:28:32 -04:00
committed by Martin K. Petersen
parent cd33223b59
commit 93204b782a
2 changed files with 64 additions and 53 deletions
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8
drivers/scsi/mpt3sas/mpt3sas_base.h
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@@ -770,7 +770,11 @@ struct pcie_sg_list {
struct chain_tracker {
void *chain_buffer;
dma_addr_t chain_buffer_dma;
struct list_head tracker_list;
};
struct chain_lookup {
struct chain_tracker *chains_per_smid;
atomic_t chain_offset;
};
/**
@@ -1261,7 +1265,7 @@ struct MPT3SAS_ADAPTER {
u32 page_size;
/* chain */
struct chain_tracker *chain_lookup;
struct chain_lookup *chain_lookup;
struct list_head free_chain_list;
struct dma_pool *chain_dma_pool;
ulong chain_pages;