Commit 8d50de9e authored by Sonic Zhang's avatar Sonic Zhang Committed by Mike Frysinger

Blackfin: SMP: fix cache flush loop

The recent commit (10774912647781) wasn't entirely correct.  While
it fixed some issues, it introduced others.  So pull in the fixes
from the public cache flush functions, and document why we need to
call things directly ourselves.
Signed-off-by: default avatarSonic Zhang <sonic.zhang@analog.com>
Signed-off-by: default avatarMike Frysinger <vapier@gentoo.org>
parent 0bf02ce6
...@@ -109,10 +109,23 @@ static void ipi_flush_icache(void *info) ...@@ -109,10 +109,23 @@ static void ipi_flush_icache(void *info)
struct blackfin_flush_data *fdata = info; struct blackfin_flush_data *fdata = info;
/* Invalidate the memory holding the bounds of the flushed region. */ /* Invalidate the memory holding the bounds of the flushed region. */
invalidate_dcache_range((unsigned long)fdata, blackfin_dcache_invalidate_range((unsigned long)fdata,
(unsigned long)fdata + sizeof(*fdata)); (unsigned long)fdata + sizeof(*fdata));
flush_icache_range(fdata->start, fdata->end); /* Make sure all write buffers in the data side of the core
* are flushed before trying to invalidate the icache. This
* needs to be after the data flush and before the icache
* flush so that the SSYNC does the right thing in preventing
* the instruction prefetcher from hitting things in cached
* memory at the wrong time -- it runs much further ahead than
* the pipeline.
*/
SSYNC();
/* ipi_flaush_icache is invoked by generic flush_icache_range,
* so call blackfin arch icache flush directly here.
*/
blackfin_icache_flush_range(fdata->start, fdata->end);
} }
static void ipi_call_function(unsigned int cpu, struct ipi_message *msg) static void ipi_call_function(unsigned int cpu, struct ipi_message *msg)
......
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