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Commit e6a588d0 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 

Pull MIPS fixes from Ralf Baechle:
 "More 3.18 fixes for MIPS:

   - backtraces were not quite working on on 64-bit kernels
   - loongson needs a different cache coherency setting
   - Loongson 3 is a MIPS64 R2 version but due to erratum we treat is an
     older architecture revision.
   - fix build errors due to undefined references to __node_distances
     for certain configurations.
   - fix instruction decodig in the jump label code.
   - for certain configurations copy_{from,to}_user destroy the content
     of $3 so that register needs to be marked as clobbed by the calling
     code.
   - Hardware Table Walker fixes.
   - fill the delay slot of the last instruction of memcpy otherwise
     whatever ends up there randomly might have undesirable effects.
   - ensure get_user/__get_user always zero the variable to be read even
     in case of an error"

* 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus:
  MIPS: jump_label.c: Handle the microMIPS J instruction encoding
  MIPS: jump_label.c: Correct the span of the J instruction
  MIPS: Zero variable read by get_user / __get_user in case of an error.
  MIPS: lib: memcpy: Restore NOP on delay slot before returning to caller
  MIPS: tlb-r4k: Add missing HTW stop/start sequences
  MIPS: asm: uaccess: Add v1 register to clobber list on EVA
  MIPS: oprofile: Fix backtrace on 64-bit kernel
  MIPS: Loongson: Set Loongson-3's ISA level to MIPS64R1
  MIPS: Loongson: Fix the write-combine CCA value setting
  MIPS: IP27: Fix __node_distances undefined error
  MIPS: Loongson3: Fix __node_distances undefined error
parents 4fc82c0a 935c2dbe

arch/mips/include/asm/jump_label.h

+7 −1
Original line number Diff line number Diff line
@@ -20,9 +20,15 @@ 
#define WORD_INSN ".word"

#endif



#ifdef CONFIG_CPU_MICROMIPS

#define NOP_INSN "nop32"

#else

#define NOP_INSN "nop"

#endif



static __always_inline bool arch_static_branch(struct static_key *key)

{

	asm_volatile_goto("1:\tnop\n\t"

	asm_volatile_goto("1:\t" NOP_INSN "\n\t"

		"nop\n\t"

		".pushsection __jump_table,  \"aw\"\n\t"

		WORD_INSN " 1b, %l[l_yes], %0\n\t"

arch/mips/include/asm/mach-loongson/cpu-feature-overrides.h

+0 −2
Original line number Diff line number Diff line
@@ -41,10 +41,8 @@ 
#define cpu_has_mcheck		0

#define cpu_has_mdmx		0

#define cpu_has_mips16		0

#define cpu_has_mips32r1	0

#define cpu_has_mips32r2	0

#define cpu_has_mips3d		0

#define cpu_has_mips64r1	0

#define cpu_has_mips64r2	0

#define cpu_has_mipsmt		0

#define cpu_has_prefetch	0

arch/mips/include/asm/uaccess.h

+8 −4
Original line number Diff line number Diff line
@@ -301,7 +301,8 @@ do { \ 
			__get_kernel_common((x), size, __gu_ptr);	\

		else							\

			__get_user_common((x), size, __gu_ptr);		\

	}								\

	} else								\

		(x) = 0;						\

									\

	__gu_err;							\

})
@@ -316,6 +317,7 @@ do { \ 
	"	.insn						\n"	\

	"	.section .fixup,\"ax\"				\n"	\

	"3:	li	%0, %4					\n"	\

	"	move	%1, $0					\n"	\

	"	j	2b					\n"	\

	"	.previous					\n"	\

	"	.section __ex_table,\"a\"			\n"	\
@@ -630,6 +632,7 @@ do { \ 
	"	.insn						\n"	\

	"	.section .fixup,\"ax\"				\n"	\

	"3:	li	%0, %4					\n"	\

	"	move	%1, $0					\n"	\

	"	j	2b					\n"	\

	"	.previous					\n"	\

	"	.section __ex_table,\"a\"			\n"	\
@@ -773,10 +776,11 @@ extern void __put_user_unaligned_unknown(void); 
	"jal\t" #destination "\n\t"

#endif



#ifndef CONFIG_CPU_DADDI_WORKAROUNDS

#define DADDI_SCRATCH "$0"

#else

#if defined(CONFIG_CPU_DADDI_WORKAROUNDS) || (defined(CONFIG_EVA) &&	\

					      defined(CONFIG_CPU_HAS_PREFETCH))

#define DADDI_SCRATCH "$3"

#else

#define DADDI_SCRATCH "$0"

#endif



extern size_t __copy_user(void *__to, const void *__from, size_t __n);

arch/mips/kernel/cpu-probe.c

+5 −2
Original line number Diff line number Diff line
@@ -757,31 +757,34 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c, unsigned int cpu) 
			c->cputype = CPU_LOONGSON2;

			__cpu_name[cpu] = "ICT Loongson-2";

			set_elf_platform(cpu, "loongson2e");

			set_isa(c, MIPS_CPU_ISA_III);

			break;

		case PRID_REV_LOONGSON2F:

			c->cputype = CPU_LOONGSON2;

			__cpu_name[cpu] = "ICT Loongson-2";

			set_elf_platform(cpu, "loongson2f");

			set_isa(c, MIPS_CPU_ISA_III);

			break;

		case PRID_REV_LOONGSON3A:

			c->cputype = CPU_LOONGSON3;

			c->writecombine = _CACHE_UNCACHED_ACCELERATED;

			__cpu_name[cpu] = "ICT Loongson-3";

			set_elf_platform(cpu, "loongson3a");

			set_isa(c, MIPS_CPU_ISA_M64R1);

			break;

		case PRID_REV_LOONGSON3B_R1:

		case PRID_REV_LOONGSON3B_R2:

			c->cputype = CPU_LOONGSON3;

			__cpu_name[cpu] = "ICT Loongson-3";

			set_elf_platform(cpu, "loongson3b");

			set_isa(c, MIPS_CPU_ISA_M64R1);

			break;

		}



		set_isa(c, MIPS_CPU_ISA_III);

		c->options = R4K_OPTS |

			     MIPS_CPU_FPU | MIPS_CPU_LLSC |

			     MIPS_CPU_32FPR;

		c->tlbsize = 64;

		c->writecombine = _CACHE_UNCACHED_ACCELERATED;

		break;

	case PRID_IMP_LOONGSON_32:  /* Loongson-1 */

		decode_configs(c);

arch/mips/kernel/jump_label.c

+32 −10
Original line number Diff line number Diff line
@@ -18,30 +18,52 @@ 


#ifdef HAVE_JUMP_LABEL



#define J_RANGE_MASK ((1ul << 28) - 1)

/*

 * Define parameters for the standard MIPS and the microMIPS jump

 * instruction encoding respectively:

 *

 * - the ISA bit of the target, either 0 or 1 respectively,

 *

 * - the amount the jump target address is shifted right to fit in the

 *   immediate field of the machine instruction, either 2 or 1,

 *

 * - the mask determining the size of the jump region relative to the

 *   delay-slot instruction, either 256MB or 128MB,

 *

 * - the jump target alignment, either 4 or 2 bytes.

 */

#define J_ISA_BIT	IS_ENABLED(CONFIG_CPU_MICROMIPS)

#define J_RANGE_SHIFT	(2 - J_ISA_BIT)

#define J_RANGE_MASK	((1ul << (26 + J_RANGE_SHIFT)) - 1)

#define J_ALIGN_MASK	((1ul << J_RANGE_SHIFT) - 1)



void arch_jump_label_transform(struct jump_entry *e,

			       enum jump_label_type type)

{

	union mips_instruction *insn_p;

	union mips_instruction insn;

	union mips_instruction *insn_p =

		(union mips_instruction *)(unsigned long)e->code;



	/* Jump only works within a 256MB aligned region. */

	BUG_ON((e->target & ~J_RANGE_MASK) != (e->code & ~J_RANGE_MASK));

	insn_p = (union mips_instruction *)msk_isa16_mode(e->code);



	/* Jump only works within an aligned region its delay slot is in. */

	BUG_ON((e->target & ~J_RANGE_MASK) != ((e->code + 4) & ~J_RANGE_MASK));



	/* Target must have 4 byte alignment. */

	BUG_ON((e->target & 3) != 0);

	/* Target must have the right alignment and ISA must be preserved. */

	BUG_ON((e->target & J_ALIGN_MASK) != J_ISA_BIT);



	if (type == JUMP_LABEL_ENABLE) {

		insn.j_format.opcode = j_op;

		insn.j_format.target = (e->target & J_RANGE_MASK) >> 2;

		insn.j_format.opcode = J_ISA_BIT ? mm_j32_op : j_op;

		insn.j_format.target = e->target >> J_RANGE_SHIFT;

	} else {

		insn.word = 0; /* nop */

	}



	get_online_cpus();

	mutex_lock(&text_mutex);

	if (IS_ENABLED(CONFIG_CPU_MICROMIPS)) {

		insn_p->halfword[0] = insn.word >> 16;

		insn_p->halfword[1] = insn.word;

	} else

		*insn_p = insn;



	flush_icache_range((unsigned long)insn_p,