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flashrom.c: Add switch for legacy impl of erasure path

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As part of a GSoC project to optimise the erasure path in flashrom
a completely different algorithm is used to perform erasure. Therefore
we need a mechanism to have the two implementations side by side to
allow for A/B testing and easy reverts should issue arise.

Change-Id: Ib5660db0067c1c799dcb5c8e83b4a4826b236442
Signed-off-by: Edward O'Callaghan <quasisec@google.com>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/71119
Reviewed-by: Anastasia Klimchuk <aklm@chromium.org>
Reviewed-by: Thomas Heijligen <src@posteo.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
This commit is contained in:
Edward O'Callaghan 2022-12-20 10:56:20 +11:00 committed by Anastasia Klimchuk
parent a30841dfe6
commit bd90bbeccd
1 changed files with 20 additions and 2 deletions
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22
flashrom.c
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@ -34,6 +34,8 @@
#include "hwaccess_physmap.h"
#include "chipdrivers.h"
static bool use_legacy_erase_path = true;
const char flashrom_version[] = FLASHROM_VERSION;
static const struct programmer_entry *programmer = NULL;
@ -1528,13 +1530,20 @@ _free_ret:
* @return 0 on success,
* 1 if all available erase functions failed.
*/
static int erase_by_layout(struct flashctx *const flashctx)
static int erase_by_layout_legacy(struct flashctx *const flashctx)
{
struct walk_info info = { 0 };
bool all_skipped = true;
return walk_by_layout(flashctx, &info, &erase_block, &all_skipped);
}
static int erase_by_layout(struct flashctx *const flashctx)
{
if (use_legacy_erase_path)
return erase_by_layout_legacy(flashctx);
return 1; /* unimplemented. */
}
static int read_erase_write_block(struct flashctx *const flashctx,
const struct walk_info *const info, const erasefn_t erasefn,
bool *all_skipped)
@ -1643,7 +1652,7 @@ _free_ret:
* @return 0 on success,
* 1 if anything has gone wrong.
*/
static int write_by_layout(struct flashctx *const flashctx,
static int write_by_layout_legacy(struct flashctx *const flashctx,
void *const curcontents, const void *const newcontents,
bool *all_skipped)
{
@ -1653,6 +1662,15 @@ static int write_by_layout(struct flashctx *const flashctx,
return walk_by_layout(flashctx, &info, read_erase_write_block, all_skipped);
}
static int write_by_layout(struct flashctx *const flashctx,
uint8_t *const curcontents, const uint8_t *const newcontents,
bool *all_skipped)
{
if (use_legacy_erase_path)
return write_by_layout_legacy(flashctx, curcontents, newcontents, all_skipped);
return 1; /* unimplemented. */
}
/**
* @brief Compares the included layout regions with content from a buffer.
*