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MIPS: Separate XPA CPU feature into LPA and MVH

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XPA (eXtended Physical Addressing) should be detected as a combination
of two architectural features:
- Large Physical Address (as per Config3.LPA). With XPA this will be set
  on MIPS32r5 cores, but it may also be set for MIPS64r2 cores too.
- MTHC0/MFHC0 instructions (as per Config5.MVH). With XPA this will be
  set, but it may also be set in VZ guest context even when Config3.LPA
  in the guest context has been cleared by the hypervisor.

As such, XPA is only usable if both bits are set. Update CPU features to
separate these two features, with cpu_has_xpa requiring both to be set.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Paul Burton <paul.burton@imgtec.com>
Cc: Maciej W. Rozycki <macro@imgtec.com>
Cc: Joshua Kinard <kumba@gentoo.org>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/13112/
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
James Hogan 2016-04-19 09:24:59 +01:00 committed by Ralf Baechle
parent ab4a92e667
commit 12822570a2
3 changed files with 11 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
arch/mips/include/asm/cpu-features.h
View File

@ -145,8 +145,14 @@
# endif
#endif
#ifndef cpu_has_lpa
#define cpu_has_lpa (cpu_data[0].options & MIPS_CPU_LPA)
#endif
#ifndef cpu_has_mvh
#define cpu_has_mvh (cpu_data[0].options & MIPS_CPU_MVH)
#endif
#ifndef cpu_has_xpa
#define cpu_has_xpa (cpu_data[0].options & MIPS_CPU_XPA)
#define cpu_has_xpa (cpu_has_lpa && cpu_has_mvh)
#endif
#ifndef cpu_has_vtag_icache
#define cpu_has_vtag_icache (cpu_data[0].icache.flags & MIPS_CACHE_VTAG)

3
arch/mips/include/asm/cpu.h
View File

@ -394,7 +394,7 @@ enum cpu_type_enum {
#define MIPS_CPU_MAAR MBIT_ULL(30) /* MAAR(I) registers are present */
#define MIPS_CPU_FRE MBIT_ULL(31) /* FRE & UFE bits implemented */
#define MIPS_CPU_RW_LLB MBIT_ULL(32) /* LLADDR/LLB writes are allowed */
#define MIPS_CPU_XPA MBIT_ULL(33) /* CPU supports Extended Physical Addressing */
#define MIPS_CPU_LPA MBIT_ULL(33) /* CPU supports Large Physical Addressing */
#define MIPS_CPU_CDMM MBIT_ULL(34) /* CPU has Common Device Memory Map */
#define MIPS_CPU_BP_GHIST MBIT_ULL(35) /* R12K+ Branch Prediction Global History */
#define MIPS_CPU_SP MBIT_ULL(36) /* Small (1KB) page support */
@ -403,6 +403,7 @@ enum cpu_type_enum {
#define MIPS_CPU_NAN_2008 MBIT_ULL(39) /* 2008 NaN implemented */
#define MIPS_CPU_VP MBIT_ULL(40) /* MIPSr6 Virtual Processors (multi-threading) */
#define MIPS_CPU_LDPTE MBIT_ULL(41) /* CPU has ldpte/lddir instructions */
#define MIPS_CPU_MVH MBIT_ULL(42) /* CPU supports MFHC0/MTHC0 */
/*
* CPU ASE encodings

2
arch/mips/kernel/cpu-probe.c
View File

@ -702,6 +702,8 @@ static inline unsigned int decode_config3(struct cpuinfo_mips *c)
c->options |= MIPS_CPU_VINT;
if (config3 & MIPS_CONF3_VEIC)
c->options |= MIPS_CPU_VEIC;
if (config3 & MIPS_CONF3_LPA)
c->options |= MIPS_CPU_LPA;
if (config3 & MIPS_CONF3_MT)
c->ases |= MIPS_ASE_MIPSMT;
if (config3 & MIPS_CONF3_ULRI)