diff options
Diffstat (limited to 'arch/powerpc/mm/hash_utils_64.c')
| -rw-r--r-- | arch/powerpc/mm/hash_utils_64.c | 96 |
1 files changed, 69 insertions, 27 deletions
diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c index 78dabf065ba9..12d679df50bd 100644 --- a/arch/powerpc/mm/hash_utils_64.c +++ b/arch/powerpc/mm/hash_utils_64.c @@ -35,14 +35,16 @@ #include <linux/memblock.h> #include <linux/context_tracking.h> #include <linux/libfdt.h> +#include <linux/debugfs.h> +#include <asm/debug.h> #include <asm/processor.h> #include <asm/pgtable.h> #include <asm/mmu.h> #include <asm/mmu_context.h> #include <asm/page.h> #include <asm/types.h> -#include <asm/uaccess.h> +#include <linux/uaccess.h> #include <asm/machdep.h> #include <asm/prom.h> #include <asm/tlbflush.h> @@ -747,7 +749,36 @@ static unsigned long __init htab_get_table_size(void) } #ifdef CONFIG_MEMORY_HOTPLUG -int create_section_mapping(unsigned long start, unsigned long end) +void resize_hpt_for_hotplug(unsigned long new_mem_size) +{ + unsigned target_hpt_shift; + + if (!mmu_hash_ops.resize_hpt) + return; + + target_hpt_shift = htab_shift_for_mem_size(new_mem_size); + + /* + * To avoid lots of HPT resizes if memory size is fluctuating + * across a boundary, we deliberately have some hysterisis + * here: we immediately increase the HPT size if the target + * shift exceeds the current shift, but we won't attempt to + * reduce unless the target shift is at least 2 below the + * current shift + */ + if ((target_hpt_shift > ppc64_pft_size) + || (target_hpt_shift < (ppc64_pft_size - 1))) { + int rc; + + rc = mmu_hash_ops.resize_hpt(target_hpt_shift); + if (rc) + printk(KERN_WARNING + "Unable to resize hash page table to target order %d: %d\n", + target_hpt_shift, rc); + } +} + +int hash__create_section_mapping(unsigned long start, unsigned long end) { int rc = htab_bolt_mapping(start, end, __pa(start), pgprot_val(PAGE_KERNEL), mmu_linear_psize, @@ -761,7 +792,7 @@ int create_section_mapping(unsigned long start, unsigned long end) return rc; } -int remove_section_mapping(unsigned long start, unsigned long end) +int hash__remove_section_mapping(unsigned long start, unsigned long end) { int rc = htab_remove_mapping(start, end, mmu_linear_psize, mmu_kernel_ssize); @@ -796,37 +827,17 @@ static void update_hid_for_hash(void) static void __init hash_init_partition_table(phys_addr_t hash_table, unsigned long htab_size) { - unsigned long ps_field; - unsigned long patb_size = 1UL << PATB_SIZE_SHIFT; + mmu_partition_table_init(); /* - * slb llp encoding for the page size used in VPM real mode. - * We can ignore that for lpid 0 + * PS field (VRMA page size) is not used for LPID 0, hence set to 0. + * For now, UPRT is 0 and we have no segment table. */ - ps_field = 0; htab_size = __ilog2(htab_size) - 18; - - BUILD_BUG_ON_MSG((PATB_SIZE_SHIFT > 24), "Partition table size too large."); - partition_tb = __va(memblock_alloc_base(patb_size, patb_size, - MEMBLOCK_ALLOC_ANYWHERE)); - - /* Initialize the Partition Table with no entries */ - memset((void *)partition_tb, 0, patb_size); - partition_tb->patb0 = cpu_to_be64(ps_field | hash_table | htab_size); - /* - * FIXME!! This should be done via update_partition table - * For now UPRT is 0 for us. - */ - partition_tb->patb1 = 0; + mmu_partition_table_set_entry(0, hash_table | htab_size, 0); pr_info("Partition table %p\n", partition_tb); if (cpu_has_feature(CPU_FTR_POWER9_DD1)) update_hid_for_hash(); - /* - * update partition table control register, - * 64 K size. - */ - mtspr(SPRN_PTCR, __pa(partition_tb) | (PATB_SIZE_SHIFT - 12)); - } static void __init htab_initialize(void) @@ -1815,3 +1826,34 @@ void hash__setup_initial_memory_limit(phys_addr_t first_memblock_base, /* Finally limit subsequent allocations */ memblock_set_current_limit(ppc64_rma_size); } + +#ifdef CONFIG_DEBUG_FS + +static int hpt_order_get(void *data, u64 *val) +{ + *val = ppc64_pft_size; + return 0; +} + +static int hpt_order_set(void *data, u64 val) +{ + if (!mmu_hash_ops.resize_hpt) + return -ENODEV; + + return mmu_hash_ops.resize_hpt(val); +} + +DEFINE_SIMPLE_ATTRIBUTE(fops_hpt_order, hpt_order_get, hpt_order_set, "%llu\n"); + +static int __init hash64_debugfs(void) +{ + if (!debugfs_create_file("hpt_order", 0600, powerpc_debugfs_root, + NULL, &fops_hpt_order)) { + pr_err("lpar: unable to create hpt_order debugsfs file\n"); + } + + return 0; +} +machine_device_initcall(pseries, hash64_debugfs); + +#endif /* CONFIG_DEBUG_FS */ |