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3 Commits

Author SHA1 Message Date
Anup Patel 3fbe233a15 lib: Pack struct sbi_fifo 
This patch reduces memory consumed by struct sbi_fifo by droping
redundant "head" member and using u16 in-place of "unsigned long".

Signed-off-by: Anup Patel <anup.patel@wdc.com>
 2019-04-03 13:48:38 -07:00
Anup Patel 9dc95021db lib: More improvements to sbi_fifo 
This patch does following improvements to sbi_fifo:
1. Use valid SBI_Exxxx error codes instead of -1
2. The sbi_fifo_is_full() and sbi_fifo_is_empty() did
   not acquire qlock before accessing head and tail
   hence fixed it
3. Added avail member for ease in debugging and simplifying
   head/tail updates.

Due to above changes size of sbi_fifo changes from 48 bytes
to 56 bytes.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
 2019-04-03 13:48:38 -07:00
Atish Patra 8334a88c63 lib: Add a fifo implementation. 
Implement a fifo to accomodate outstanding IPIs for a specific hart
at the same time.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
 2019-04-03 09:57:42 +05:30