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MIPS: Print segment physical address when EU=1 

Currently the debugfs interface to print the segment configuration
refuses to print the physical address of mapped segments. However if the
EU bit is set these become unmapped at error level (when
CP0_Status.ERL=1), so the physical address is still relevant.

Update the logic to print the physical address of mapped segments when
the EU bit is set, while still hiding the Cache Coherency Attribute
(since EU overrides that to uncached when ERL=1 too).

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/13833/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
James Hogan 2016-07-27 16:07:54 +01:00 committed by Ralf Baechle
parent 2f8f8c04e8
commit 5573f6ad3e
1 changed files with 8 additions and 5 deletions
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13
arch/mips/kernel/segment.c
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@ -26,17 +26,20 @@ static void build_segment_config(char *str, unsigned int cfg)
/* /*
* Access modes MK, MSK and MUSK are mapped segments. Therefore * Access modes MK, MSK and MUSK are mapped segments. Therefore
* there is no direct physical address mapping. * there is no direct physical address mapping unless it becomes
* unmapped uncached at error level due to EU.
*/ */
if ((am == 0) || (am > 3)) { if ((am == 0) || (am > 3) || (cfg & MIPS_SEGCFG_EU))
str += sprintf(str, " %03lx", str += sprintf(str, " %03lx",
((cfg & MIPS_SEGCFG_PA) >> MIPS_SEGCFG_PA_SHIFT)); ((cfg & MIPS_SEGCFG_PA) >> MIPS_SEGCFG_PA_SHIFT));
else
str += sprintf(str, " UND");
if ((am == 0) || (am > 3))
str += sprintf(str, " %01ld", str += sprintf(str, " %01ld",
((cfg & MIPS_SEGCFG_C) >> MIPS_SEGCFG_C_SHIFT)); ((cfg & MIPS_SEGCFG_C) >> MIPS_SEGCFG_C_SHIFT));
} else { else
str += sprintf(str, " UND");
str += sprintf(str, " U"); str += sprintf(str, " U");
}
/* Exception configuration. */ /* Exception configuration. */
str += sprintf(str, " %01ld\n", str += sprintf(str, " %01ld\n",