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powerpc/rfi-flush: Differentiate enabled and patched flush types

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Currently the rfi-flush messages print 'Using <type> flush' for all
enabled_flush_types, but that is not necessarily true -- as now the
fallback flush is always enabled on pseries, but the fixup function
overwrites its nop/branch slot with other flush types, if available.

So, replace the 'Using <type> flush' messages with '<type> flush is
available'.

Also, print the patched flush types in the fixup function, so users
can know what is (not) being used (e.g., the slower, fallback flush,
or no flush type at all if flush is disabled via the debugfs switch).

Suggested-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Mauricio Faria de Oliveira <mauricfo@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Mauricio Faria de Oliveira 2018-03-14 19:40:41 -03:00 committed by Michael Ellerman
parent 84749a58b6
commit 0063d61ccf
2 changed files with 11 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
arch/powerpc/kernel/setup_64.c
View File

@ -884,15 +884,15 @@ static void init_fallback_flush(void)
void setup_rfi_flush(enum l1d_flush_type types, bool enable)
{
if (types & L1D_FLUSH_FALLBACK) {
pr_info("rfi-flush: Using fallback displacement flush\n");
pr_info("rfi-flush: fallback displacement flush available\n");
init_fallback_flush();
}
if (types & L1D_FLUSH_ORI)
pr_info("rfi-flush: Using ori type flush\n");
pr_info("rfi-flush: ori type flush available\n");
if (types & L1D_FLUSH_MTTRIG)
pr_info("rfi-flush: Using mttrig type flush\n");
pr_info("rfi-flush: mttrig type flush available\n");
enabled_flush_types = types;

9
arch/powerpc/lib/feature-fixups.c
View File

@ -153,7 +153,14 @@ void do_rfi_flush_fixups(enum l1d_flush_type types)
patch_instruction(dest + 2, instrs[2]);
}
printk(KERN_DEBUG "rfi-flush: patched %d locations\n", i);
printk(KERN_DEBUG "rfi-flush: patched %d locations (%s flush)\n", i,
(types == L1D_FLUSH_NONE) ? "no" :
(types == L1D_FLUSH_FALLBACK) ? "fallback displacement" :
(types & L1D_FLUSH_ORI) ? (types & L1D_FLUSH_MTTRIG)
? "ori+mttrig type"
: "ori type" :
(types & L1D_FLUSH_MTTRIG) ? "mttrig type"
: "unknown");
}
#endif /* CONFIG_PPC_BOOK3S_64 */