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author | Chris Metcalf <cmetcalf@tilera.com> | 2011-05-02 19:54:32 (GMT) |
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committer | Chris Metcalf <cmetcalf@tilera.com> | 2011-05-04 18:40:46 (GMT) |
commit | dbb434214e34014dc7acb0e7811c37471df26a72 (patch) | |
tree | c7402998f41a967107fe3e7bec11b66c3b6a9afe /arch | |
parent | 43d9ebba93b4e775f89efc1eeeed3075a4ab4741 (diff) | |
download | linux-fsl-qoriq-dbb434214e34014dc7acb0e7811c37471df26a72.tar.xz |
arch/tile: disable GX prefetcher during cache flush
Otherwise, it's possible to end up with the prefetcher pulling
data into cache that the code believes has been flushed.
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Diffstat (limited to 'arch')
-rw-r--r-- | arch/tile/lib/cacheflush.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/arch/tile/lib/cacheflush.c b/arch/tile/lib/cacheflush.c index 35c1d8c..8928aac 100644 --- a/arch/tile/lib/cacheflush.c +++ b/arch/tile/lib/cacheflush.c @@ -15,6 +15,7 @@ #include <asm/page.h> #include <asm/cacheflush.h> #include <arch/icache.h> +#include <arch/spr_def.h> void __flush_icache_range(unsigned long start, unsigned long end) @@ -39,6 +40,18 @@ void finv_buffer_remote(void *buffer, size_t size, int hfh) char *p, *base; size_t step_size, load_count; const unsigned long STRIPE_WIDTH = 8192; +#ifdef __tilegx__ + /* + * On TILE-Gx, we must disable the dstream prefetcher before doing + * a cache flush; otherwise, we could end up with data in the cache + * that we don't want there. Note that normally we'd do an mf + * after the SPR write to disabling the prefetcher, but we do one + * below, before any further loads, so there's no need to do it + * here. + */ + uint_reg_t old_dstream_pf = __insn_mfspr(SPR_DSTREAM_PF); + __insn_mtspr(SPR_DSTREAM_PF, 0); +#endif /* * Flush and invalidate the buffer out of the local L1/L2 @@ -122,4 +135,9 @@ void finv_buffer_remote(void *buffer, size_t size, int hfh) /* Wait for the load+inv's (and thus finvs) to have completed. */ __insn_mf(); + +#ifdef __tilegx__ + /* Reenable the prefetcher. */ + __insn_mtspr(SPR_DSTREAM_PF, old_dstream_pf); +#endif } |