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fsi: occ: Use a large buffer for responses

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Allocate a large buffer for each OCC to handle response data. This
removes memory allocation during an operation, and also allows for
the maximum amount of SBE FFDC.

Previously for the putsram and attn commands, only 32 words would have
been available, and for getsram, only up to the size of the transfer.
SBE FFDC might be up to 8Kb.

The SBE interface expects data to be specified in units of words (4
bytes), defined as OCC_MAX_RESP_WORDS.

This change allows the full FFDC capture to be implemented, where before
it was not available.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
Link: https://lore.kernel.org/r/20211019205307.36946-2-eajames@linux.ibm.com
Signed-off-by: Joel Stanley <joel@jms.id.au>
This commit is contained in:
Eddie James
2021-10-19 15:53:04 -05:00
committed by Joel Stanley
parent 908dbf0242
commit 008d3825a8
2 changed files with 46 additions and 66 deletions
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2
include/linux/fsi-occ.h
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@@ -19,6 +19,8 @@ struct device;
#define OCC_RESP_CRIT_OCB 0xE3
#define OCC_RESP_CRIT_HW 0xE4
#define OCC_MAX_RESP_WORDS 2048
int fsi_occ_submit(struct device *dev, const void *request, size_t req_len,
void *response, size_t *resp_len);