diff options
| author | Christophe Leroy <christophe.leroy@csgroup.eu> | 2020-05-19 08:49:14 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-05-26 15:22:21 +0300 |
| commit | 136a9a0f74d2e0d9de5515190fe80344b86b45cf (patch) | |
| tree | 504f1c7c165ea9f431ba0ca6257aeba9957b41cf /arch/powerpc/mm/nohash | |
| parent | f76c8f6d257cefda60221c83af7f97d9f74cb3ce (diff) | |
| download | linux-136a9a0f74d2e0d9de5515190fe80344b86b45cf.tar.xz | |
powerpc/8xx: Don't set IMMR map anymore at boot
Only early debug requires IMMR to be mapped early.
No need to set it up and pin it in assembly. Map it
through page tables at udbg init when necessary.
If CONFIG_PIN_TLB_IMMR is selected, pin it once we
don't need the 32 Mb pinned RAM anymore.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/13c1e8539fdf363d3146f4884e5c3c76c6c308b5.1589866984.git.christophe.leroy@csgroup.eu
Diffstat (limited to 'arch/powerpc/mm/nohash')
| -rw-r--r-- | arch/powerpc/mm/nohash/8xx.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/arch/powerpc/mm/nohash/8xx.c b/arch/powerpc/mm/nohash/8xx.c index b27017109a36..44cbde7612cb 100644 --- a/arch/powerpc/mm/nohash/8xx.c +++ b/arch/powerpc/mm/nohash/8xx.c @@ -66,7 +66,7 @@ void __init MMU_init_hw(void) if (IS_ENABLED(CONFIG_PIN_TLB_DATA)) { unsigned long ctr = mfspr(SPRN_MD_CTR) & 0xfe000000; unsigned long flags = 0xf0 | MD_SPS16K | _PAGE_SH | _PAGE_DIRTY; - int i = IS_ENABLED(CONFIG_PIN_TLB_IMMR) ? 29 : 28; + int i = 28; unsigned long addr = 0; unsigned long mem = total_lowmem; @@ -81,12 +81,19 @@ void __init MMU_init_hw(void) } } -static void __init mmu_mapin_immr(void) +static bool immr_is_mapped __initdata; + +void __init mmu_mapin_immr(void) { unsigned long p = PHYS_IMMR_BASE; unsigned long v = VIRT_IMMR_BASE; int offset; + if (immr_is_mapped) + return; + + immr_is_mapped = true; + for (offset = 0; offset < IMMR_SIZE; offset += PAGE_SIZE) map_kernel_page(v + offset, p + offset, PAGE_KERNEL_NCG); } @@ -122,9 +129,10 @@ unsigned long __init mmu_mapin_ram(unsigned long base, unsigned long top) { unsigned long mapped; + mmu_mapin_immr(); + if (__map_without_ltlbs) { mapped = 0; - mmu_mapin_immr(); if (!IS_ENABLED(CONFIG_PIN_TLB_IMMR)) patch_instruction_site(&patch__dtlbmiss_immr_jmp, ppc_inst(PPC_INST_NOP)); if (!IS_ENABLED(CONFIG_PIN_TLB_TEXT)) @@ -143,7 +151,6 @@ unsigned long __init mmu_mapin_ram(unsigned long base, unsigned long top) */ mmu_mapin_ram_chunk(0, einittext8, PAGE_KERNEL_X); mmu_mapin_ram_chunk(einittext8, mapped, PAGE_KERNEL); - mmu_mapin_immr(); } mmu_patch_cmp_limit(&patch__dtlbmiss_linmem_top, mapped); |