[PATCH V2 32/68] powerpc/mm/radix: Add radix callback for early init routines
Balbir Singh
bsingharora at gmail.com
Thu Apr 21 22:22:59 AEST 2016
On 09/04/16 16:13, Aneesh Kumar K.V wrote:
> This add routines for early setup w.r.t radix. We use device tree
> property ibm,processor-radix-AP-encodings to find supported page sizes.
> If we don't find above we consider 64K and 4K as supported page sizes.
>
> We do map vmemap using 2M page size if we can. Linear mapping is done
> such that we use required page size for that range. For ex: memory of
> 3.5G is mapped such that we use 1G mapping till 3G range and use 2M
> mapping for the rest.
>
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar at linux.vnet.ibm.com>
> ---
> arch/powerpc/include/asm/book3s/64/mmu.h | 17 +-
> arch/powerpc/include/asm/book3s/64/radix.h | 2 +
> arch/powerpc/mm/Makefile | 1 +
> arch/powerpc/mm/pgtable-radix.c | 344 +++++++++++++++++++++++++++++
> arch/powerpc/platforms/powernv/setup.c | 5 +-
> 5 files changed, 367 insertions(+), 2 deletions(-)
> create mode 100644 arch/powerpc/mm/pgtable-radix.c
>
> diff --git a/arch/powerpc/include/asm/book3s/64/mmu.h b/arch/powerpc/include/asm/book3s/64/mmu.h
> index a66cd3e65a33..a526642f1c02 100644
> --- a/arch/powerpc/include/asm/book3s/64/mmu.h
> +++ b/arch/powerpc/include/asm/book3s/64/mmu.h
> @@ -16,7 +16,10 @@ struct mmu_psize_def {
> int penc[MMU_PAGE_COUNT]; /* HPTE encoding */
> unsigned int tlbiel; /* tlbiel supported for that page size */
> unsigned long avpnm; /* bits to mask out in AVPN in the HPTE */
> - unsigned long sllp; /* SLB L||LP (exact mask to use in slbmte) */
> + union {
> + unsigned long sllp; /* SLB L||LP (exact mask to use in slbmte) */
> + unsigned long ap; /* Ap encoding used by PowerISA 3.0 */
> + };
> };
> extern struct mmu_psize_def mmu_psize_defs[MMU_PAGE_COUNT];
>
> @@ -98,22 +101,34 @@ extern int mmu_vmemmap_psize;
> extern int mmu_io_psize;
>
> /* MMU initialization */
> +extern void radix_init_native(void);
> extern void hlearly_init_mmu(void);
> +extern void rearly_init_mmu(void);
> static inline void early_init_mmu(void)
> {
> + if (radix_enabled())
> + return rearly_init_mmu();
rearly sounds like rear-ly, r_early_init_mmu()?
> return hlearly_init_mmu();
> }
> extern void hlearly_init_mmu_secondary(void);
> +extern void rearly_init_mmu_secondary(void);
> static inline void early_init_mmu_secondary(void)
> {
> + if (radix_enabled())
> + return rearly_init_mmu_secondary();
> return hlearly_init_mmu_secondary();
> }
>
> extern void hlsetup_initial_memory_limit(phys_addr_t first_memblock_base,
> phys_addr_t first_memblock_size);
> +extern void rsetup_initial_memory_limit(phys_addr_t first_memblock_base,
> + phys_addr_t first_memblock_size);
> static inline void setup_initial_memory_limit(phys_addr_t first_memblock_base,
> phys_addr_t first_memblock_size)
> {
> + if (radix_enabled())
> + return rsetup_initial_memory_limit(first_memblock_base,
> + first_memblock_size);
> return hlsetup_initial_memory_limit(first_memblock_base,
> first_memblock_size);
> }
> diff --git a/arch/powerpc/include/asm/book3s/64/radix.h b/arch/powerpc/include/asm/book3s/64/radix.h
> index 46a5381324f5..806dc2195f85 100644
> --- a/arch/powerpc/include/asm/book3s/64/radix.h
> +++ b/arch/powerpc/include/asm/book3s/64/radix.h
> @@ -133,5 +133,7 @@ static inline int rpmd_trans_huge(pmd_t pmd)
>
> #endif
>
> +extern int map_radix_kernel_page(unsigned long ea, unsigned long pa,
> + pgprot_t flags, unsigned int psz);
> #endif /* __ASSEMBLY__ */
> #endif
> diff --git a/arch/powerpc/mm/Makefile b/arch/powerpc/mm/Makefile
> index ef778997daa9..d734934cbb1e 100644
> --- a/arch/powerpc/mm/Makefile
> +++ b/arch/powerpc/mm/Makefile
> @@ -15,6 +15,7 @@ obj-$(CONFIG_PPC_BOOK3E) += tlb_low_$(CONFIG_WORD_SIZE)e.o
> hash64-$(CONFIG_PPC_NATIVE) := hash_native_64.o
> obj-$(CONFIG_PPC_BOOK3E_64) += pgtable-book3e.o
> obj-$(CONFIG_PPC_STD_MMU_64) += pgtable-hash64.o hash_utils_64.o slb_low.o slb.o $(hash64-y)
> +obj-$(CONFIG_PPC_RADIX_MMU) += pgtable-radix.o
> obj-$(CONFIG_PPC_STD_MMU_32) += ppc_mmu_32.o hash_low_32.o
> obj-$(CONFIG_PPC_STD_MMU) += tlb_hash$(CONFIG_WORD_SIZE).o \
> mmu_context_hash$(CONFIG_WORD_SIZE).o
> diff --git a/arch/powerpc/mm/pgtable-radix.c b/arch/powerpc/mm/pgtable-radix.c
> new file mode 100644
> index 000000000000..5737769469b3
> --- /dev/null
> +++ b/arch/powerpc/mm/pgtable-radix.c
> @@ -0,0 +1,344 @@
> +/*
> + * page table handling routines for radix page table
> + *
> + * Copyright (C) 2015 Aneesh Kumar K.V <aneesh.kumar at linux.vnet.ibm.com>
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License
> + * as published by the Free Software Foundation; either version
> + * 2 of the License, or (at your option) any later version.
> + *
> + */
> +#include <linux/sched.h>
> +#include <linux/memblock.h>
> +#include <linux/of_fdt.h>
> +
> +#include <asm/pgtable.h>
> +#include <asm/pgalloc.h>
> +#include <asm/dma.h>
> +#include <asm/machdep.h>
> +#include <asm/mmu.h>
> +#include <asm/firmware.h>
> +
> +static int native_update_partition_table(u64 patb1)
> +{
> + partition_tb->patb1 = cpu_to_be64(patb1);
> + return 0;
> +}
> +
> +static __ref void *early_alloc_pgtable(unsigned long size)
> +{
> + void *pt;
> +
> + pt = __va(memblock_alloc_base(size, size, MEMBLOCK_ALLOC_ANYWHERE));
> + memset(pt, 0, size);
> +
> + return pt;
> +}
> +
> +int map_radix_kernel_page(unsigned long ea, unsigned long pa,
> + pgprot_t flags,
> + unsigned int map_page_size)
> +{
> + pgd_t *pgdp;
> + pud_t *pudp;
> + pmd_t *pmdp;
> + pte_t *ptep;
> + /*
> + * Make sure task size is correct as per the max adddr
> + */
> + BUILD_BUG_ON(TASK_SIZE_USER64 > R_PGTABLE_RANGE);
> + if (slab_is_available()) {
> + pgdp = pgd_offset_k(ea);
> + pudp = pud_alloc(&init_mm, pgdp, ea);
> + if (!pudp)
> + return -ENOMEM;
> + if (map_page_size == PUD_SIZE) {
> + ptep = (pte_t *)pudp;
> + goto set_the_pte;
> + }
> + pmdp = pmd_alloc(&init_mm, pudp, ea);
> + if (!pmdp)
> + return -ENOMEM;
> + if (map_page_size == PMD_SIZE) {
> + ptep = (pte_t *)pudp;
> + goto set_the_pte;
> + }
> + ptep = pte_alloc_kernel(pmdp, ea);
> + if (!ptep)
> + return -ENOMEM;
> + } else {
> + pgdp = pgd_offset_k(ea);
> + if (pgd_none(*pgdp)) {
> + pudp = early_alloc_pgtable(PUD_TABLE_SIZE);
> + BUG_ON(pudp == NULL);
> + pgd_populate(&init_mm, pgdp, pudp);
> + }
> + pudp = pud_offset(pgdp, ea);
> + if (map_page_size == PUD_SIZE) {
> + ptep = (pte_t *)pudp;
> + goto set_the_pte;
> + }
> + if (pud_none(*pudp)) {
> + pmdp = early_alloc_pgtable(PMD_TABLE_SIZE);
> + BUG_ON(pmdp == NULL);
> + pud_populate(&init_mm, pudp, pmdp);
> + }
> + pmdp = pmd_offset(pudp, ea);
> + if (map_page_size == PMD_SIZE) {
> + ptep = (pte_t *)pudp;
> + goto set_the_pte;
> + }
> + if (!pmd_present(*pmdp)) {
> + ptep = early_alloc_pgtable(PAGE_SIZE);
> + BUG_ON(ptep == NULL);
> + pmd_populate_kernel(&init_mm, pmdp, ptep);
> + }
> + ptep = pte_offset_kernel(pmdp, ea);
> + }
> +
> +set_the_pte:
> + set_pte_at(&init_mm, ea, ptep, pfn_pte(pa >> PAGE_SHIFT, flags));
> + smp_wmb();
We got ptesync inside set_pte_at, do we need smp_wmb()?
> + return 0;
> +}
> +
> +static void __init radix_init_pgtable(void)
> +{
> + int loop_count;
> + u64 base, end, start_addr;
> + unsigned long rts_field;
> + struct memblock_region *reg;
> + unsigned long linear_page_size;
> +
> + /* We don't support slb for radix */
> + mmu_slb_size = 0;
> + /*
> + * Create the linear mapping, using standard page size for now
> + */
> + loop_count = 0;
I would call this page_size_idx
> + for_each_memblock(memory, reg) {
> +
> + start_addr = reg->base;
> +
> +redo:
> + if (loop_count < 1 && mmu_psize_defs[MMU_PAGE_1G].shift)
> + linear_page_size = PUD_SIZE;
> + else if (loop_count < 2 && mmu_psize_defs[MMU_PAGE_2M].shift)
> + linear_page_size = PMD_SIZE;
> + else
> + linear_page_size = PAGE_SIZE;
> +
> + base = _ALIGN_UP(start_addr, linear_page_size);
> + end = _ALIGN_DOWN(reg->base + reg->size, linear_page_size);
> +
> + pr_info("Mapping range 0x%lx - 0x%lx with 0x%lx\n",
> + (unsigned long)base, (unsigned long)end,
> + linear_page_size);
> +
> + while (base < end) {
> + map_radix_kernel_page((unsigned long)__va(base),
> + base, PAGE_KERNEL_X,
> + linear_page_size);
> + base += linear_page_size;
> + }
> + /*
> + * map the rest using lower page size
> + */
> + if (end < reg->base + reg->size) {
> + start_addr = end;
> + loop_count++;
> + goto redo;
> + }
Can't we do something like nr_count = reg->size / linear_page_size
then map nr_pud_count entries and use nr_remaining = reg->size % linear_page_size
Then repeat by interchaing nr_remaining with nr_count and updating linear_page_size?
> + }
> + /*
> + * Allocate Partition table and process table for the
> + * host.
> + */
> + BUILD_BUG_ON_MSG((PRTB_SIZE_SHIFT > 23), "Process table size too large.");
> + process_tb = early_alloc_pgtable(1UL << PRTB_SIZE_SHIFT);
> + /*
> + * Fill in the process table.
> + * we support 52 bits, hence 52-28 = 24, 11000
> + */
> + rts_field = 3ull << PPC_BITLSHIFT(2);
> + process_tb->prtb0 = cpu_to_be64(rts_field | __pa(init_mm.pgd) | R_PGD_INDEX_SIZE);
> + /*
> + * Fill in the partition table. We are suppose to use effective address
> + * of process table here. But our linear mapping also enable us to use
> + * physical address here.
> + */
> + ppc_md.update_partition_table(__pa(process_tb) | (PRTB_SIZE_SHIFT - 12) | PATB_GR);
Is this for guest radix?
> + pr_info("Process table %p and radix root for kernel: %p\n", process_tb, init_mm.pgd);
> +}
> +
> +static void __init radix_init_partition_table(void)
> +{
> + unsigned long rts_field;
> + /*
> + * we support 52 bits, hence 52-28 = 24, 11000
> + */
> + rts_field = 3ull << PPC_BITLSHIFT(2);
> +
> + BUILD_BUG_ON_MSG((PATB_SIZE_SHIFT > 24), "Partition table size too large.");
> + partition_tb = early_alloc_pgtable(1UL << PATB_SIZE_SHIFT);
> + partition_tb->patb0 = cpu_to_be64(rts_field | __pa(init_mm.pgd) |
> + R_PGD_INDEX_SIZE | PATB_HR);
> + printk("Partition table %p\n", partition_tb);
> +
> + memblock_set_current_limit(MEMBLOCK_ALLOC_ANYWHERE);
> + /*
> + * update partition table control register,
> + * 64 K size.
> + */
> + mtspr(SPRN_PTCR, __pa(partition_tb) | (PATB_SIZE_SHIFT - 12));
> +}
> +
> +void __init radix_init_native(void)
> +{
> + ppc_md.update_partition_table = native_update_partition_table;
> +}
> +
> +static int __init get_idx_from_shift(unsigned int shift)
> +{
> + int idx = -1;
> +
> + switch (shift) {
> + case 0xc:
> + idx = MMU_PAGE_4K;
> + break;
> + case 0x10:
> + idx = MMU_PAGE_64K;
> + break;
> + case 0x15:
> + idx = MMU_PAGE_2M;
> + break;
> + case 0x1e:
> + idx = MMU_PAGE_1G;
> + break;
> + }
> + return idx;
> +}
> +
> +static int __init radix_dt_scan_page_sizes(unsigned long node,
> + const char *uname, int depth,
> + void *data)
> +{
> + int size = 0;
Assignment is not required, since we get &size in of_get_flat_dt_prop
> + int shift, idx;
> + unsigned int ap;
> + const __be32 *prop;
> + const char *type = of_get_flat_dt_prop(node, "device_type", NULL);
> +
> + /* We are scanning "cpu" nodes only */
> + if (type == NULL || strcmp(type, "cpu") != 0)
> + return 0;
> +
> + prop = of_get_flat_dt_prop(node, "ibm,processor-radix-AP-encodings", &size);
> + if (!prop)
> + return 0;
> +
> + pr_info("Page sizes from device-tree:\n");
> + for (; size >= 4; size -= 4, ++prop) {
> +
> + struct mmu_psize_def *def;
> +
> + /* top 3 bit is AP encoding */
> + shift = be32_to_cpu(prop[0]) & ~(0xe << 28);
> + ap = be32_to_cpu(prop[0]) >> 29;
Can we get more meaningful names for 4, 0xe, 28, 29?
> + pr_info("Page size sift = %d AP=0x%x\n", shift, ap);
> +
> + idx = get_idx_from_shift(shift);
> + if (idx < 0)
> + continue;
> +
> + def = &mmu_psize_defs[idx];
> + def->shift = shift;
> + def->ap = ap;
> + }
> +
> + /* needed ? */
> + cur_cpu_spec->mmu_features &= ~MMU_FTR_NO_SLBIE_B;
> + return 1;
> +}
> +
> +static void __init radix_init_page_sizes(void)
> +{
> + int rc;
> +
> + /*
> + * Try to find the available page sizes in the device-tree
> + */
> + rc = of_scan_flat_dt(radix_dt_scan_page_sizes, NULL);
> + if (rc != 0) /* Found */
> + goto found;
> + /*
> + * let's assume we have page 4k and 64k support
> + */
> + mmu_psize_defs[MMU_PAGE_4K].shift = 12;
> + mmu_psize_defs[MMU_PAGE_4K].ap = 0x0;
> +
> + mmu_psize_defs[MMU_PAGE_64K].shift = 16;
> + mmu_psize_defs[MMU_PAGE_64K].ap = 0x5;
> +found:
> +#ifdef CONFIG_SPARSEMEM_VMEMMAP
> + if (mmu_psize_defs[MMU_PAGE_2M].shift) {
> + /*
> + * map vmemmap using 2M if available
> + */
> + mmu_vmemmap_psize = MMU_PAGE_2M;
Good idea!
> + }
> +#endif /* CONFIG_SPARSEMEM_VMEMMAP */
> + return;
> +}
> +
> +void __init rearly_init_mmu(void)
> +{
> +#ifdef CONFIG_PPC_64K_PAGES
> + /* PAGE_SIZE mappings */
> + mmu_virtual_psize = MMU_PAGE_64K;
> +#else
> + mmu_virtual_psize = MMU_PAGE_4K;
> +#endif
> +
> +#ifdef CONFIG_SPARSEMEM_VMEMMAP
> + /* vmemmap mapping */
> + mmu_vmemmap_psize = mmu_virtual_psize;
> +#endif
> + /*
> + * initialize page table size
> + */
> + __pte_index_size = R_PTE_INDEX_SIZE;
> + __pmd_index_size = R_PMD_INDEX_SIZE;
> + __pud_index_size = R_PUD_INDEX_SIZE;
> + __pgd_index_size = R_PGD_INDEX_SIZE;
> + __pmd_cache_index = R_PMD_INDEX_SIZE;
> + __pte_table_size = R_PTE_TABLE_SIZE;
> + __pmd_table_size = R_PMD_TABLE_SIZE;
> + __pud_table_size = R_PUD_TABLE_SIZE;
> + __pgd_table_size = R_PGD_TABLE_SIZE;
> +
> + radix_init_page_sizes();
> +
> + if (!firmware_has_feature(FW_FEATURE_LPAR))
> + radix_init_partition_table();
> +
> + radix_init_pgtable();
> +}
> +
> +void rearly_init_mmu_secondary(void)
> +{
> + /*
> + * update partition table control register, 64 K size.
> + */
> + if (!firmware_has_feature(FW_FEATURE_LPAR))
> + mtspr(SPRN_PTCR,
> + __pa(partition_tb) | (PATB_SIZE_SHIFT - 12));
> +}
> +
> +void rsetup_initial_memory_limit(phys_addr_t first_memblock_base,
> + phys_addr_t first_memblock_size)
> +{
> + /* Finally limit subsequent allocations */
> + memblock_set_current_limit(first_memblock_base + first_memblock_size);
> +}
> diff --git a/arch/powerpc/platforms/powernv/setup.c b/arch/powerpc/platforms/powernv/setup.c
> index 1acb0c72d923..ee6430bedcc3 100644
> --- a/arch/powerpc/platforms/powernv/setup.c
> +++ b/arch/powerpc/platforms/powernv/setup.c
> @@ -273,7 +273,10 @@ static int __init pnv_probe(void)
> if (!of_flat_dt_is_compatible(root, "ibm,powernv"))
> return 0;
>
> - hpte_init_native();
> + if (IS_ENABLED(CONFIG_PPC_RADIX_MMU) && radix_enabled())
> + radix_init_native();
> + else if (IS_ENABLED(CONFIG_PPC_STD_MMU_64))
> + hpte_init_native();
>
> if (firmware_has_feature(FW_FEATURE_OPAL))
> pnv_setup_machdep_opal();
>
This looks good!
Balbir Singh.
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