powerpc/6xx: fix setup and use of SPRN_SPRG_PGDIR for hash32

Not only the 603 but all 6xx need SPRN_SPRG_PGDIR to be initialised at
startup. This patch move it from __setup_cpu_603() to start_here()
and __secondary_start(), close to the initialisation of SPRN_THREAD.

Previously, virt addr of PGDIR was retrieved from thread struct.
Now that it is the phys addr which is stored in SPRN_SPRG_PGDIR,
hash_page() shall not convert it to phys anymore.
This patch removes the conversion.

Fixes: 93c4a162b014 ("powerpc/6xx: Store PGDIR physical address in a SPRG")
Reported-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/kernel/cpu_setup_6xx.S b/arch/powerpc/kernel/cpu_setup_6xx.S
index 6f1c11e..7534ecf 100644 (file)
--- a/arch/powerpc/kernel/cpu_setup_6xx.S
+++ b/arch/powerpc/kernel/cpu_setup_6xx.S
@@ -24,9 +24,6 @@ BEGIN_MMU_FTR_SECTION
        li      r10,0
        mtspr   SPRN_SPRG_603_LRU,r10           /* init SW LRU tracking */
 END_MMU_FTR_SECTION_IFSET(MMU_FTR_NEED_DTLB_SW_LRU)
-       lis     r10, (swapper_pg_dir - PAGE_OFFSET)@h
-       ori     r10, r10, (swapper_pg_dir - PAGE_OFFSET)@l
-       mtspr   SPRN_SPRG_PGDIR, r10
 
 BEGIN_FTR_SECTION
        bl      __init_fpu_registers

diff --git a/arch/powerpc/kernel/head_32.S b/arch/powerpc/kernel/head_32.S
index ce6a972..48051c8 100644 (file)
--- a/arch/powerpc/kernel/head_32.S
+++ b/arch/powerpc/kernel/head_32.S
@@ -855,6 +855,9 @@ __secondary_start:
        li      r3,0
        stw     r3, RTAS_SP(r4)         /* 0 => not in RTAS */
 #endif
+       lis     r4, (swapper_pg_dir - PAGE_OFFSET)@h
+       ori     r4, r4, (swapper_pg_dir - PAGE_OFFSET)@l
+       mtspr   SPRN_SPRG_PGDIR, r4
 
        /* enable MMU and jump to start_secondary */
        li      r4,MSR_KERNEL
@@ -942,6 +945,9 @@ start_here:
        li      r3,0
        stw     r3, RTAS_SP(r4)         /* 0 => not in RTAS */
 #endif
+       lis     r4, (swapper_pg_dir - PAGE_OFFSET)@h
+       ori     r4, r4, (swapper_pg_dir - PAGE_OFFSET)@l
+       mtspr   SPRN_SPRG_PGDIR, r4
 
        /* stack */
        lis     r1,init_thread_union@ha

diff --git a/arch/powerpc/mm/hash_low_32.S b/arch/powerpc/mm/hash_low_32.S
index 1f13494..a6c491f 100644 (file)
--- a/arch/powerpc/mm/hash_low_32.S
+++ b/arch/powerpc/mm/hash_low_32.S
@@ -70,12 +70,12 @@ _GLOBAL(hash_page)
        lis     r0,KERNELBASE@h         /* check if kernel address */
        cmplw   0,r4,r0
        ori     r3,r3,_PAGE_USER|_PAGE_PRESENT /* test low addresses as user */
-       mfspr   r5, SPRN_SPRG_PGDIR     /* virt page-table root */
+       mfspr   r5, SPRN_SPRG_PGDIR     /* phys page-table root */
        blt+    112f                    /* assume user more likely */
-       lis     r5,swapper_pg_dir@ha    /* if kernel address, use */
-       addi    r5,r5,swapper_pg_dir@l  /* kernel page table */
+       lis     r5, (swapper_pg_dir - PAGE_OFFSET)@ha   /* if kernel address, use */
+       addi    r5 ,r5 ,(swapper_pg_dir - PAGE_OFFSET)@l        /* kernel page table */
        rlwimi  r3,r9,32-12,29,29       /* MSR_PR -> _PAGE_USER */
-112:   tophys(r5, r5)
+112:
 #ifndef CONFIG_PTE_64BIT
        rlwimi  r5,r4,12,20,29          /* insert top 10 bits of address */
        lwz     r8,0(r5)                /* get pmd entry */