This patch adds files related to memory management and here is our memory-layout: Fixmap : 0xffc02000 – 0xfffff000 (4 MB - 12KB) Pkmap : 0xff800000 – 0xffc00000 (4 MB) Vmalloc : 0xf0200000 – 0xff000000 (238 MB) Lowmem : 0x80000000 – 0xc0000000 (1GB) abiv1 CPU (CK610) is VIPT cache and it doesn't support highmem. abiv2 CPUs are all PIPT cache and they could support highmem. Lowmem is directly mapped by msa0 & msa1 reg, and we needn't setup memory page table for it. Changelog: - fixup pfn_valid(pfn) compile error for modules. - fixup compile warning for CONFIG_DEBUG_HIGHMEM. - fixup module compile error for EXPORT_SYMBOL(empty_zero_page). - dma-mapping: fix up dma_mapping error The arch_sync_dma_for_cpu()/arch_sync_dma_for_device() implementation is broken for some combinations that end up in a BUG() instead of performing the necessary flushes. - Fixup arch_sync_dma() broken when size is larger than PAGE_SIZE. Ignore the DMA_ATTR_NON_CONSISTENT, remove the BUG() and use return NULL instead. The implementation of arch should follow the following rules: map for_cpu for_device unmap TO_DEV writeback none writeback none TO_CPU invalidate invalidate* invalidate invalidate* BIDIR writeback invalidate writeback invalidate Link:https://lore.kernel.org/lkml/20180518215548.GH17671@xxxxxxxxxxxxxxxxxxxxx/ Signed-off-by: Guo Ren <ren_guo@xxxxxxxxx> Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx> --- arch/csky/abiv1/inc/abi/ckmmu.h | 75 ++++++++ arch/csky/abiv1/inc/abi/page.h | 27 +++ arch/csky/abiv1/inc/abi/pgtable-bits.h | 37 ++++ arch/csky/abiv1/mmap.c | 66 +++++++ arch/csky/abiv2/inc/abi/ckmmu.h | 87 ++++++++++ arch/csky/abiv2/inc/abi/page.h | 14 ++ arch/csky/abiv2/inc/abi/pgtable-bits.h | 37 ++++ arch/csky/include/asm/addrspace.h | 10 ++ arch/csky/include/asm/fixmap.h | 27 +++ arch/csky/include/asm/highmem.h | 51 ++++++ arch/csky/include/asm/mmu.h | 12 ++ arch/csky/include/asm/page.h | 104 +++++++++++ arch/csky/include/asm/pgalloc.h | 115 +++++++++++++ arch/csky/include/asm/pgtable.h | 306 +++++++++++++++++++++++++++++++++ arch/csky/include/asm/segment.h | 19 ++ arch/csky/include/asm/shmparam.h | 11 ++ arch/csky/mm/dma-mapping.c | 254 +++++++++++++++++++++++++++ arch/csky/mm/highmem.c | 198 +++++++++++++++++++++ arch/csky/mm/init.c | 122 +++++++++++++ arch/csky/mm/ioremap.c | 48 ++++++ 20 files changed, 1620 insertions(+) create mode 100644 arch/csky/abiv1/inc/abi/ckmmu.h create mode 100644 arch/csky/abiv1/inc/abi/page.h create mode 100644 arch/csky/abiv1/inc/abi/pgtable-bits.h create mode 100644 arch/csky/abiv1/mmap.c create mode 100644 arch/csky/abiv2/inc/abi/ckmmu.h create mode 100644 arch/csky/abiv2/inc/abi/page.h create mode 100644 arch/csky/abiv2/inc/abi/pgtable-bits.h create mode 100644 arch/csky/include/asm/addrspace.h create mode 100644 arch/csky/include/asm/fixmap.h create mode 100644 arch/csky/include/asm/highmem.h create mode 100644 arch/csky/include/asm/mmu.h create mode 100644 arch/csky/include/asm/page.h create mode 100644 arch/csky/include/asm/pgalloc.h create mode 100644 arch/csky/include/asm/pgtable.h create mode 100644 arch/csky/include/asm/segment.h create mode 100644 arch/csky/include/asm/shmparam.h create mode 100644 arch/csky/mm/dma-mapping.c create mode 100644 arch/csky/mm/highmem.c create mode 100644 arch/csky/mm/init.c create mode 100644 arch/csky/mm/ioremap.c diff --git a/arch/csky/abiv1/inc/abi/ckmmu.h b/arch/csky/abiv1/inc/abi/ckmmu.h new file mode 100644 index 0000000..3a00201 --- /dev/null +++ b/arch/csky/abiv1/inc/abi/ckmmu.h @@ -0,0 +1,75 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. + +#ifndef __ASM_CSKY_CKMMUV1_H +#define __ASM_CSKY_CKMMUV1_H +#include <abi/reg_ops.h> + +static inline int read_mmu_index(void) +{ + return cprcr("cpcr0"); +} + +static inline void write_mmu_index(int value) +{ + cpwcr("cpcr0", value); +} + +static inline int read_mmu_entrylo0(void) +{ + return cprcr("cpcr2") << 6; +} + +static inline int read_mmu_entrylo1(void) +{ + return cprcr("cpcr3") << 6; +} + +static inline void write_mmu_pagemask(int value) +{ + cpwcr("cpcr6", value); +} + +static inline int read_mmu_entryhi(void) +{ + return cprcr("cpcr4"); +} + +static inline void write_mmu_entryhi(int value) +{ + cpwcr("cpcr4", value); +} + +/* + * TLB operations. + */ +static inline void tlb_probe(void) +{ + cpwcr("cpcr8", 0x80000000); +} + +static inline void tlb_read(void) +{ + cpwcr("cpcr8", 0x40000000); +} + +static inline void tlb_invalid_all(void) +{ + cpwcr("cpcr8", 0x04000000); +} + +static inline void tlb_invalid_indexed(void) +{ + cpwcr("cpcr8", 0x02000000); +} + +static inline void setup_pgd(unsigned long pgd, bool kernel) +{ + cpwcr("cpcr29", pgd); +} + +static inline unsigned long get_pgd(void) +{ + return cprcr("cpcr29"); +} +#endif /* __ASM_CSKY_CKMMUV1_H */ diff --git a/arch/csky/abiv1/inc/abi/page.h b/arch/csky/abiv1/inc/abi/page.h new file mode 100644 index 0000000..6336e92 --- /dev/null +++ b/arch/csky/abiv1/inc/abi/page.h @@ -0,0 +1,27 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. + +extern unsigned long shm_align_mask; +extern void flush_dcache_page(struct page *page); + +static inline unsigned long pages_do_alias(unsigned long addr1, + unsigned long addr2) +{ + return (addr1 ^ addr2) & shm_align_mask; +} + +static inline void clear_user_page(void *addr, unsigned long vaddr, + struct page *page) +{ + clear_page(addr); + if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK)) + flush_dcache_page(page); +} + +static inline void copy_user_page(void *to, void *from, unsigned long vaddr, + struct page *page) +{ + copy_page(to, from); + if (pages_do_alias((unsigned long) to, vaddr & PAGE_MASK)) + flush_dcache_page(page); +} diff --git a/arch/csky/abiv1/inc/abi/pgtable-bits.h b/arch/csky/abiv1/inc/abi/pgtable-bits.h new file mode 100644 index 0000000..455075b --- /dev/null +++ b/arch/csky/abiv1/inc/abi/pgtable-bits.h @@ -0,0 +1,37 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. + +#ifndef __ASM_CSKY_PGTABLE_BITS_H +#define __ASM_CSKY_PGTABLE_BITS_H + +/* implemented in software */ +#define _PAGE_ACCESSED (1<<3) +#define PAGE_ACCESSED_BIT (3) + +#define _PAGE_READ (1<<1) +#define _PAGE_WRITE (1<<2) +#define _PAGE_PRESENT (1<<0) + +#define _PAGE_MODIFIED (1<<4) +#define PAGE_MODIFIED_BIT (4) + +/* implemented in hardware */ +#define _PAGE_GLOBAL (1<<6) + +#define _PAGE_VALID (1<<7) +#define PAGE_VALID_BIT (7) + +#define _PAGE_DIRTY (1<<8) +#define PAGE_DIRTY_BIT (8) + +#define _PAGE_CACHE (3<<9) +#define _PAGE_UNCACHE (2<<9) + +#define _CACHE_MASK (7<<9) + +#define _CACHE_CACHED (_PAGE_VALID | _PAGE_CACHE) +#define _CACHE_UNCACHED (_PAGE_VALID | _PAGE_UNCACHE) + +#define HAVE_ARCH_UNMAPPED_AREA + +#endif /* __ASM_CSKY_PGTABLE_BITS_H */ diff --git a/arch/csky/abiv1/mmap.c b/arch/csky/abiv1/mmap.c new file mode 100644 index 0000000..b462fd5 --- /dev/null +++ b/arch/csky/abiv1/mmap.c @@ -0,0 +1,66 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. + +#include <linux/fs.h> +#include <linux/mm.h> +#include <linux/mman.h> +#include <linux/shm.h> +#include <linux/sched.h> +#include <linux/random.h> +#include <linux/io.h> + +unsigned long shm_align_mask = (0x4000 >> 1) - 1; /* Sane caches */ + +#define COLOUR_ALIGN(addr, pgoff) \ + ((((addr) + shm_align_mask) & ~shm_align_mask) + \ + (((pgoff) << PAGE_SHIFT) & shm_align_mask)) + +unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, + unsigned long len, unsigned long pgoff, unsigned long flags) +{ + struct vm_area_struct *vmm; + int do_color_align; + + if (flags & MAP_FIXED) { + /* + * We do not accept a shared mapping if it would violate + * cache aliasing constraints. + */ + if ((flags & MAP_SHARED) && + ((addr - (pgoff << PAGE_SHIFT)) & shm_align_mask)) + return -EINVAL; + return addr; + } + + if (len > TASK_SIZE) + return -ENOMEM; + do_color_align = 0; + if (filp || (flags & MAP_SHARED)) + do_color_align = 1; + if (addr) { + if (do_color_align) + addr = COLOUR_ALIGN(addr, pgoff); + else + addr = PAGE_ALIGN(addr); + vmm = find_vma(current->mm, addr); + if (TASK_SIZE - len >= addr && + (!vmm || addr + len <= vmm->vm_start)) + return addr; + } + addr = TASK_UNMAPPED_BASE; + if (do_color_align) + addr = COLOUR_ALIGN(addr, pgoff); + else + addr = PAGE_ALIGN(addr); + + for (vmm = find_vma(current->mm, addr); ; vmm = vmm->vm_next) { + /* At this point: (!vmm || addr < vmm->vm_end). */ + if (TASK_SIZE - len < addr) + return -ENOMEM; + if (!vmm || addr + len <= vmm->vm_start) + return addr; + addr = vmm->vm_end; + if (do_color_align) + addr = COLOUR_ALIGN(addr, pgoff); + } +} diff --git a/arch/csky/abiv2/inc/abi/ckmmu.h b/arch/csky/abiv2/inc/abi/ckmmu.h new file mode 100644 index 0000000..97230ad --- /dev/null +++ b/arch/csky/abiv2/inc/abi/ckmmu.h @@ -0,0 +1,87 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. + +#ifndef __ASM_CSKY_CKMMUV2_H +#define __ASM_CSKY_CKMMUV2_H + +#include <abi/reg_ops.h> +#include <asm/barrier.h> + +static inline int read_mmu_index(void) +{ + return mfcr("cr<0, 15>"); +} + +static inline void write_mmu_index(int value) +{ + mtcr("cr<0, 15>", value); +} + +static inline int read_mmu_entrylo0(void) +{ + return mfcr("cr<2, 15>"); +} + +static inline int read_mmu_entrylo1(void) +{ + return mfcr("cr<3, 15>"); +} + +static inline void write_mmu_pagemask(int value) +{ + mtcr("cr<6, 15>", value); +} + +static inline int read_mmu_entryhi(void) +{ + return mfcr("cr<4, 15>"); +} + +static inline void write_mmu_entryhi(int value) +{ + mtcr("cr<4, 15>", value); +} + +/* + * TLB operations. + */ +static inline void tlb_probe(void) +{ + mtcr("cr<8, 15>", 0x80000000); +} + +static inline void tlb_read(void) +{ + mtcr("cr<8, 15>", 0x40000000); +} + +static inline void tlb_invalid_all(void) +{ +#ifdef CONFIG_CPU_HAS_TLBI + asm volatile("tlbi.alls\n":::"memory"); + sync_is(); +#else + mtcr("cr<8, 15>", 0x04000000); +#endif +} + +static inline void tlb_invalid_indexed(void) +{ + mtcr("cr<8, 15>", 0x02000000); +} + +/* setup hardrefil pgd */ +static inline unsigned long get_pgd(void) +{ + return mfcr("cr<29, 15>"); +} + +static inline void setup_pgd(unsigned long pgd, bool kernel) +{ + if (kernel) + mtcr("cr<28, 15>", pgd); + else + mtcr("cr<29, 15>", pgd); +} + +#endif /* __ASM_CSKY_CKMMUV2_H */ diff --git a/arch/csky/abiv2/inc/abi/page.h b/arch/csky/abiv2/inc/abi/page.h new file mode 100644 index 0000000..0a70cb5 --- /dev/null +++ b/arch/csky/abiv2/inc/abi/page.h @@ -0,0 +1,14 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. + +static inline void clear_user_page(void *addr, unsigned long vaddr, + struct page *page) +{ + clear_page(addr); +} + +static inline void copy_user_page(void *to, void *from, unsigned long vaddr, + struct page *page) +{ + copy_page(to, from); +} diff --git a/arch/csky/abiv2/inc/abi/pgtable-bits.h b/arch/csky/abiv2/inc/abi/pgtable-bits.h new file mode 100644 index 0000000..b20ae19 --- /dev/null +++ b/arch/csky/abiv2/inc/abi/pgtable-bits.h @@ -0,0 +1,37 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. + +#ifndef __ASM_CSKY_PGTABLE_BITS_H +#define __ASM_CSKY_PGTABLE_BITS_H + +/* implemented in software */ +#define _PAGE_ACCESSED (1<<7) +#define PAGE_ACCESSED_BIT (7) + +#define _PAGE_READ (1<<8) +#define _PAGE_WRITE (1<<9) +#define _PAGE_PRESENT (1<<10) + +#define _PAGE_MODIFIED (1<<11) +#define PAGE_MODIFIED_BIT (11) + +/* implemented in hardware */ +#define _PAGE_GLOBAL (1<<0) + +#define _PAGE_VALID (1<<1) +#define PAGE_VALID_BIT (1) + +#define _PAGE_DIRTY (1<<2) +#define PAGE_DIRTY_BIT (2) + +#define _PAGE_SO (1<<5) +#define _PAGE_BUF (1<<6) + +#define _PAGE_CACHE (1<<3) + +#define _CACHE_MASK _PAGE_CACHE + +#define _CACHE_CACHED (_PAGE_VALID | _PAGE_CACHE | _PAGE_BUF) +#define _CACHE_UNCACHED (_PAGE_VALID | _PAGE_SO) + +#endif /* __ASM_CSKY_PGTABLE_BITS_H */ diff --git a/arch/csky/include/asm/addrspace.h b/arch/csky/include/asm/addrspace.h new file mode 100644 index 0000000..d1c2ede --- /dev/null +++ b/arch/csky/include/asm/addrspace.h @@ -0,0 +1,10 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. + +#ifndef __ASM_CSKY_ADDRSPACE_H +#define __ASM_CSKY_ADDRSPACE_H + +#define KSEG0 0x80000000ul +#define KSEG0ADDR(a) (((unsigned long)a & 0x1fffffff) | KSEG0) + +#endif /* __ASM_CSKY_ADDRSPACE_H */ diff --git a/arch/csky/include/asm/fixmap.h b/arch/csky/include/asm/fixmap.h new file mode 100644 index 0000000..380ff0a --- /dev/null +++ b/arch/csky/include/asm/fixmap.h @@ -0,0 +1,27 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. + +#ifndef __ASM_CSKY_FIXMAP_H +#define __ASM_CSKY_FIXMAP_H + +#include <asm/page.h> +#ifdef CONFIG_HIGHMEM +#include <linux/threads.h> +#include <asm/kmap_types.h> +#endif + +enum fixed_addresses { +#ifdef CONFIG_HIGHMEM + FIX_KMAP_BEGIN, + FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_TYPE_NR * NR_CPUS) - 1, +#endif + __end_of_fixed_addresses +}; + +#define FIXADDR_TOP 0xffffc000 +#define FIXADDR_SIZE (__end_of_fixed_addresses << PAGE_SHIFT) +#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) + +#include <asm-generic/fixmap.h> + +#endif /* __ASM_CSKY_FIXMAP_H */ diff --git a/arch/csky/include/asm/highmem.h b/arch/csky/include/asm/highmem.h new file mode 100644 index 0000000..a345a2f --- /dev/null +++ b/arch/csky/include/asm/highmem.h @@ -0,0 +1,51 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. + +#ifndef __ASM_CSKY_HIGHMEM_H +#define __ASM_CSKY_HIGHMEM_H + +#ifdef __KERNEL__ + +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/uaccess.h> +#include <asm/kmap_types.h> +#include <asm/cache.h> + +/* undef for production */ +#define HIGHMEM_DEBUG 1 + +/* declarations for highmem.c */ +extern unsigned long highstart_pfn, highend_pfn; + +extern pte_t *pkmap_page_table; + +/* + * Right now we initialize only a single pte table. It can be extended + * easily, subsequent pte tables have to be allocated in one physical + * chunk of RAM. + */ +#define LAST_PKMAP 1024 +#define LAST_PKMAP_MASK (LAST_PKMAP-1) +#define PKMAP_NR(virt) ((virt-PKMAP_BASE) >> PAGE_SHIFT) +#define PKMAP_ADDR(nr) (PKMAP_BASE + ((nr) << PAGE_SHIFT)) + +extern void *kmap_high(struct page *page); +extern void kunmap_high(struct page *page); + +extern void *kmap(struct page *page); +extern void kunmap(struct page *page); +extern void *kmap_atomic(struct page *page); +extern void __kunmap_atomic(void *kvaddr); +extern void *kmap_atomic_pfn(unsigned long pfn); +extern struct page *kmap_atomic_to_page(void *ptr); + +#define flush_cache_kmaps() do {} while (0) + +extern void kmap_init(void); + +#define kmap_prot PAGE_KERNEL + +#endif /* __KERNEL__ */ + +#endif /* __ASM_CSKY_HIGHMEM_H */ diff --git a/arch/csky/include/asm/mmu.h b/arch/csky/include/asm/mmu.h new file mode 100644 index 0000000..cb34467 --- /dev/null +++ b/arch/csky/include/asm/mmu.h @@ -0,0 +1,12 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. + +#ifndef __ASM_CSKY_MMU_H +#define __ASM_CSKY_MMU_H + +typedef struct { + unsigned long asid[NR_CPUS]; + void *vdso; +} mm_context_t; + +#endif /* __ASM_CSKY_MMU_H */ diff --git a/arch/csky/include/asm/page.h b/arch/csky/include/asm/page.h new file mode 100644 index 0000000..73cf2bd --- /dev/null +++ b/arch/csky/include/asm/page.h @@ -0,0 +1,104 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#ifndef __ASM_CSKY_PAGE_H +#define __ASM_CSKY_PAGE_H + +#include <asm/setup.h> +#include <asm/cache.h> +#include <linux/const.h> + +/* + * PAGE_SHIFT determines the page size + */ +#define PAGE_SHIFT 12 +#define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT) +#define PAGE_MASK (~(PAGE_SIZE - 1)) +#define THREAD_SIZE (PAGE_SIZE * 2) +#define THREAD_MASK (~(THREAD_SIZE - 1)) +#define THREAD_SHIFT (PAGE_SHIFT + 1) + +/* + * NOTE: virtual isn't really correct, actually it should be the offset into the + * memory node, but we have no highmem, so that works for now. + * TODO: implement (fast) pfn<->pgdat_idx conversion functions, this makes lots + * of the shifts unnecessary. + */ + +#ifndef __ASSEMBLY__ + +#include <linux/pfn.h> + +#define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT) +#define pfn_to_virt(pfn) __va((pfn) << PAGE_SHIFT) + +#define virt_addr_valid(kaddr) ((void *)(kaddr) >= (void *)PAGE_OFFSET && \ + (void *)(kaddr) < high_memory) +#define pfn_valid(pfn) ((pfn) >= ARCH_PFN_OFFSET && ((pfn) - ARCH_PFN_OFFSET) < max_mapnr) + +extern void *memset(void *dest, int c, size_t l); +extern void *memcpy(void *to, const void *from, size_t l); + +#define clear_page(page) memset((page), 0, PAGE_SIZE) +#define copy_page(to, from) memcpy((to), (from), PAGE_SIZE) + +#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) +#define phys_to_page(paddr) (pfn_to_page(PFN_DOWN(paddr))) + +struct page; + +#include <abi/page.h> + +struct vm_area_struct; + +/* + * These are used to make use of C type-checking.. + */ +typedef struct { unsigned long pte_low; } pte_t; +#define pte_val(x) ((x).pte_low) + +typedef struct { unsigned long pgd; } pgd_t; +typedef struct { unsigned long pgprot; } pgprot_t; +typedef struct page *pgtable_t; + +#define pgd_val(x) ((x).pgd) +#define pgprot_val(x) ((x).pgprot) + +#define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t))) + +#define __pte(x) ((pte_t) { (x) }) +#define __pgd(x) ((pgd_t) { (x) }) +#define __pgprot(x) ((pgprot_t) { (x) }) + +#endif /* !__ASSEMBLY__ */ + +#define PHYS_OFFSET (CONFIG_RAM_BASE & ~(LOWMEM_LIMIT - 1)) +#define PHYS_OFFSET_OFFSET (CONFIG_RAM_BASE & (LOWMEM_LIMIT - 1)) +#define ARCH_PFN_OFFSET PFN_DOWN(CONFIG_RAM_BASE) + +#define PAGE_OFFSET 0x80000000 +#define LOWMEM_LIMIT 0x40000000 + +#define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET) +#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - \ + PHYS_OFFSET)) +#define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0)) + +#define MAP_NR(x) PFN_DOWN((unsigned long)(x) - PAGE_OFFSET - \ + PHYS_OFFSET_OFFSET) +#define virt_to_page(x) (mem_map + MAP_NR(x)) + +#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ + VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) + +/* + * main RAM and kernel working space are coincident at 0x80000000, but to make + * life more interesting, there's also an uncached virtual shadow at 0xb0000000 + * - these mappings are fixed in the MMU + */ + +#define pfn_to_kaddr(x) __va(PFN_PHYS(x)) + +#include <asm-generic/memory_model.h> +#include <asm-generic/getorder.h> + +#endif /* __ASM_CSKY_PAGE_H */ diff --git a/arch/csky/include/asm/pgalloc.h b/arch/csky/include/asm/pgalloc.h new file mode 100644 index 0000000..bf4f4a0 --- /dev/null +++ b/arch/csky/include/asm/pgalloc.h @@ -0,0 +1,115 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. + +#ifndef __ASM_CSKY_PGALLOC_H +#define __ASM_CSKY_PGALLOC_H + +#include <linux/highmem.h> +#include <linux/mm.h> +#include <linux/sched.h> + +static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, + pte_t *pte) +{ + set_pmd(pmd, __pmd(__pa(pte))); +} + +static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, + pgtable_t pte) +{ + set_pmd(pmd, __pmd(__pa(page_address(pte)))); +} + +#define pmd_pgtable(pmd) pmd_page(pmd) + +extern void pgd_init(unsigned long *p); + +static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, + unsigned long address) +{ + pte_t *pte; + unsigned long *kaddr, i; + + pte = (pte_t *) __get_free_pages(GFP_KERNEL | __GFP_RETRY_MAYFAIL, + PTE_ORDER); + kaddr = (unsigned long *)pte; + if (address & 0x80000000) + for (i = 0; i < (PAGE_SIZE/4); i++) + *(kaddr + i) = 0x1; + else + clear_page(kaddr); + + return pte; +} + +static inline struct page *pte_alloc_one(struct mm_struct *mm, + unsigned long address) +{ + struct page *pte; + unsigned long *kaddr, i; + + pte = alloc_pages(GFP_KERNEL | __GFP_RETRY_MAYFAIL, PTE_ORDER); + if (pte) { + kaddr = kmap_atomic(pte); + if (address & 0x80000000) { + for (i = 0; i < (PAGE_SIZE/4); i++) + *(kaddr + i) = 0x1; + } else + clear_page(kaddr); + kunmap_atomic(kaddr); + pgtable_page_ctor(pte); + } + return pte; +} + +static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) +{ + free_pages((unsigned long)pte, PTE_ORDER); +} + +static inline void pte_free(struct mm_struct *mm, pgtable_t pte) +{ + pgtable_page_dtor(pte); + __free_pages(pte, PTE_ORDER); +} + +static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) +{ + free_pages((unsigned long)pgd, PGD_ORDER); +} + +static inline pgd_t *pgd_alloc(struct mm_struct *mm) +{ + pgd_t *ret; + pgd_t *init; + + ret = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ORDER); + if (ret) { + init = pgd_offset(&init_mm, 0UL); + pgd_init((unsigned long *)ret); + memcpy(ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD, + (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t)); + /* prevent out of order excute */ + smp_mb(); +#ifdef CONFIG_CPU_NEED_TLBSYNC + dcache_wb_range((unsigned int)ret, + (unsigned int)(ret + PTRS_PER_PGD)); +#endif + } + + return ret; +} + +#define __pte_free_tlb(tlb, pte, address) \ +do { \ + pgtable_page_dtor(pte); \ + tlb_remove_page(tlb, pte); \ +} while (0) + +#define check_pgt_cache() do {} while (0) + +extern void pagetable_init(void); +extern void pre_mmu_init(void); +extern void pre_trap_init(void); + +#endif /* __ASM_CSKY_PGALLOC_H */ diff --git a/arch/csky/include/asm/pgtable.h b/arch/csky/include/asm/pgtable.h new file mode 100644 index 0000000..edfcbb2 --- /dev/null +++ b/arch/csky/include/asm/pgtable.h @@ -0,0 +1,306 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. + +#ifndef __ASM_CSKY_PGTABLE_H +#define __ASM_CSKY_PGTABLE_H + +#include <asm/fixmap.h> +#include <asm/addrspace.h> +#include <abi/pgtable-bits.h> +#include <asm-generic/pgtable-nopmd.h> + +#define PGDIR_SHIFT 22 +#define PGDIR_SIZE (1UL << PGDIR_SHIFT) +#define PGDIR_MASK (~(PGDIR_SIZE-1)) + +#define USER_PTRS_PER_PGD (0x80000000UL/PGDIR_SIZE) +#define FIRST_USER_ADDRESS 0UL + +#define PKMAP_BASE (0xff800000) + +#define VMALLOC_START (0xc0008000) +#define VMALLOC_END (PKMAP_BASE - 2*PAGE_SIZE) + +/* + * C-SKY is two-level paging structure: + */ +#define PGD_ORDER 0 +#define PTE_ORDER 0 + +#define PTRS_PER_PGD ((PAGE_SIZE << PGD_ORDER) / sizeof(pgd_t)) +#define PTRS_PER_PMD 1 +#define PTRS_PER_PTE ((PAGE_SIZE << PTE_ORDER) / sizeof(pte_t)) + +#define pte_ERROR(e) \ + pr_err("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, (e).pte_low) +#define pgd_ERROR(e) \ + pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) + +/* Find an entry in the third-level page table.. */ +#define __pte_offset_t(address) \ + (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) +#define pte_offset_kernel(dir, address) \ + (pmd_page_vaddr(*(dir)) + __pte_offset_t(address)) +#define pte_offset_map(dir, address) \ + ((pte_t *)page_address(pmd_page(*(dir))) + __pte_offset_t(address)) +#define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT)) +#define pte_clear(mm, addr, ptep) set_pte((ptep), \ + (((unsigned int)addr&0x80000000)?__pte(1):__pte(0))) +#define pte_none(pte) (!(pte_val(pte)&0xfffffffe)) +#define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT) +#define pte_pfn(x) ((unsigned long)((x).pte_low >> PAGE_SHIFT)) +#define pfn_pte(pfn, prot) __pte(((unsigned long long)(pfn) << PAGE_SHIFT) \ + | pgprot_val(prot)) + +#define __READABLE (_PAGE_READ | _PAGE_VALID | _PAGE_ACCESSED) +#define __WRITEABLE (_PAGE_WRITE | _PAGE_DIRTY | _PAGE_MODIFIED) + +#define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_MODIFIED | \ + _CACHE_MASK) + +#define pte_unmap(pte) ((void)(pte)) + +#define __swp_type(x) (((x).val >> 4) & 0xff) +#define __swp_offset(x) ((x).val >> 12) +#define __swp_entry(type, offset) ((swp_entry_t) {((type) << 4) | \ + ((offset) << 12) }) +#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) +#define __swp_entry_to_pte(x) ((pte_t) { (x).val }) + +#define pte_page(x) pfn_to_page(pte_pfn(x)) +#define __mk_pte(page_nr, pgprot) __pte(((page_nr) << PAGE_SHIFT) | \ + pgprot_val(pgprot)) + +/* + * CSKY can't do page protection for execute, and considers that the same like + * read. Also, write permissions imply read permissions. This is the closest + * we can get by reasonable means.. + */ +#define PAGE_NONE __pgprot(_PAGE_PRESENT | _CACHE_CACHED) +#define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \ + _CACHE_CACHED) +#define PAGE_COPY __pgprot(_PAGE_PRESENT | _PAGE_READ | _CACHE_CACHED) +#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_READ | _CACHE_CACHED) +#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \ + _PAGE_GLOBAL | _CACHE_CACHED) +#define PAGE_USERIO __pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \ + _CACHE_CACHED) + +#define __P000 PAGE_NONE +#define __P001 PAGE_READONLY +#define __P010 PAGE_COPY +#define __P011 PAGE_COPY +#define __P100 PAGE_READONLY +#define __P101 PAGE_READONLY +#define __P110 PAGE_COPY +#define __P111 PAGE_COPY + +#define __S000 PAGE_NONE +#define __S001 PAGE_READONLY +#define __S010 PAGE_SHARED +#define __S011 PAGE_SHARED +#define __S100 PAGE_READONLY +#define __S101 PAGE_READONLY +#define __S110 PAGE_SHARED +#define __S111 PAGE_SHARED + +extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]; +#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) + +extern void load_pgd(unsigned long pg_dir); +extern pte_t invalid_pte_table[PTRS_PER_PTE]; + +static inline int pte_special(pte_t pte) { return 0; } +static inline pte_t pte_mkspecial(pte_t pte) { return pte; } + +static inline void set_pte(pte_t *p, pte_t pte) +{ + *p = pte; +#if defined(CONFIG_CPU_NEED_TLBSYNC) + dcache_wb_line((u32)p); +#endif + /* prevent out of order excution */ + smp_mb(); +} +#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval) + +static inline pte_t *pmd_page_vaddr(pmd_t pmd) +{ + unsigned long ptr; + + ptr = pmd_val(pmd); + + return __va(ptr); +} + +#define pmd_phys(pmd) pmd_val(pmd) + +static inline void set_pmd(pmd_t *p, pmd_t pmd) +{ + *p = pmd; +#if defined(CONFIG_CPU_NEED_TLBSYNC) + dcache_wb_line((u32)p); +#endif + /* prevent specul excute */ + smp_mb(); +} + + +static inline int pmd_none(pmd_t pmd) +{ + return pmd_val(pmd) == __pa(invalid_pte_table); +} + +#define pmd_bad(pmd) (pmd_val(pmd) & ~PAGE_MASK) + +static inline int pmd_present(pmd_t pmd) +{ + return (pmd_val(pmd) != __pa(invalid_pte_table)); +} + +static inline void pmd_clear(pmd_t *p) +{ + pmd_val(*p) = (__pa(invalid_pte_table)); +#if defined(CONFIG_CPU_NEED_TLBSYNC) + dcache_wb_line((u32)p); +#endif +} + +/* + * The following only work if pte_present() is true. + * Undefined behaviour if not.. + */ +static inline int pte_read(pte_t pte) +{ + return pte.pte_low & _PAGE_READ; +} + +static inline int pte_write(pte_t pte) +{ + return (pte).pte_low & _PAGE_WRITE; +} + +static inline int pte_dirty(pte_t pte) +{ + return (pte).pte_low & _PAGE_MODIFIED; +} + +static inline int pte_young(pte_t pte) +{ + return (pte).pte_low & _PAGE_ACCESSED; +} + +static inline pte_t pte_wrprotect(pte_t pte) +{ + pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_DIRTY); + return pte; +} + +static inline pte_t pte_mkclean(pte_t pte) +{ + pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_DIRTY); + return pte; +} + +static inline pte_t pte_mkold(pte_t pte) +{ + pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_VALID); + return pte; +} + +static inline pte_t pte_mkwrite(pte_t pte) +{ + pte_val(pte) |= _PAGE_WRITE; + if (pte_val(pte) & _PAGE_MODIFIED) + pte_val(pte) |= _PAGE_DIRTY; + return pte; +} + +static inline pte_t pte_mkdirty(pte_t pte) +{ + pte_val(pte) |= _PAGE_MODIFIED; + if (pte_val(pte) & _PAGE_WRITE) + pte_val(pte) |= _PAGE_DIRTY; + return pte; +} + +static inline pte_t pte_mkyoung(pte_t pte) +{ + pte_val(pte) |= _PAGE_ACCESSED; + if (pte_val(pte) & _PAGE_READ) + pte_val(pte) |= _PAGE_VALID; + return pte; +} + +#define __pgd_offset(address) pgd_index(address) +#define __pud_offset(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1)) +#define __pmd_offset(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1)) + +/* to find an entry in a kernel page-table-directory */ +#define pgd_offset_k(address) pgd_offset(&init_mm, address) + +#define pgd_index(address) ((address) >> PGDIR_SHIFT) + +/* + * Macro to make mark a page protection value as "uncacheable". Note + * that "protection" is really a misnomer here as the protection value + * contains the memory attribute bits, dirty bits, and various other + * bits as well. + */ +#define pgprot_noncached pgprot_noncached + +static inline pgprot_t pgprot_noncached(pgprot_t _prot) +{ + unsigned long prot = pgprot_val(_prot); + + prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED; + + return __pgprot(prot); +} + +/* + * Conversion functions: convert a page and protection to a page entry, + * and a page entry and page directory to the page they refer to. + */ +#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot)) +static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) +{ + return __pte((pte_val(pte) & _PAGE_CHG_MASK) | + (pgprot_val(newprot))); +} + +/* to find an entry in a page-table-directory */ +static inline pgd_t *pgd_offset(struct mm_struct *mm, unsigned long address) +{ + return mm->pgd + pgd_index(address); +} + +/* Find an entry in the third-level page table.. */ +static inline pte_t *pte_offset(pmd_t *dir, unsigned long address) +{ + return (pte_t *) (pmd_page_vaddr(*dir)) + + ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)); +} + +extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; +extern void paging_init(void); + +extern void show_jtlb_table(void); + +void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, + pte_t *pte); + +/* Needs to be defined here and not in linux/mm.h, as it is arch dependent */ +#define kern_addr_valid(addr) (1) + +/* + * No page table caches to initialise + */ +#define pgtable_cache_init() do {} while (0) + +#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \ + remap_pfn_range(vma, vaddr, pfn, size, prot) + +#include <asm-generic/pgtable.h> + +#endif /* __ASM_CSKY_PGTABLE_H */ diff --git a/arch/csky/include/asm/segment.h b/arch/csky/include/asm/segment.h new file mode 100644 index 0000000..ffdc4c4 --- /dev/null +++ b/arch/csky/include/asm/segment.h @@ -0,0 +1,19 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. + +#ifndef __ASM_CSKY_SEGMENT_H +#define __ASM_CSKY_SEGMENT_H + +typedef struct { + unsigned long seg; +} mm_segment_t; + +#define KERNEL_DS ((mm_segment_t) { 0xFFFFFFFF }) +#define get_ds() KERNEL_DS + +#define USER_DS ((mm_segment_t) { 0x80000000UL }) +#define get_fs() (current_thread_info()->addr_limit) +#define set_fs(x) (current_thread_info()->addr_limit = (x)) +#define segment_eq(a, b) ((a).seg == (b).seg) + +#endif /* __ASM_CSKY_SEGMENT_H */ diff --git a/arch/csky/include/asm/shmparam.h b/arch/csky/include/asm/shmparam.h new file mode 100644 index 0000000..efafe4c --- /dev/null +++ b/arch/csky/include/asm/shmparam.h @@ -0,0 +1,11 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. + +#ifndef __ASM_CSKY_SHMPARAM_H +#define __ASM_CSKY_SHMPARAM_H + +#define SHMLBA (4 * PAGE_SIZE) + +#define __ARCH_FORCE_SHMLBA + +#endif /* __ASM_CSKY_SHMPARAM_H */ diff --git a/arch/csky/mm/dma-mapping.c b/arch/csky/mm/dma-mapping.c new file mode 100644 index 0000000..85437b2 --- /dev/null +++ b/arch/csky/mm/dma-mapping.c @@ -0,0 +1,254 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. + +#include <linux/cache.h> +#include <linux/dma-mapping.h> +#include <linux/dma-contiguous.h> +#include <linux/dma-noncoherent.h> +#include <linux/genalloc.h> +#include <linux/highmem.h> +#include <linux/io.h> +#include <linux/mm.h> +#include <linux/scatterlist.h> +#include <linux/types.h> +#include <linux/version.h> +#include <asm/cache.h> + +static struct gen_pool *atomic_pool; +static size_t atomic_pool_size __initdata = SZ_256K; + +static int __init early_coherent_pool(char *p) +{ + atomic_pool_size = memparse(p, &p); + return 0; +} +early_param("coherent_pool", early_coherent_pool); + +static int __init atomic_pool_init(void) +{ + struct page *page; + size_t size = atomic_pool_size; + void *ptr; + int ret; + + atomic_pool = gen_pool_create(PAGE_SHIFT, -1); + if (!atomic_pool) + BUG(); + + page = alloc_pages(GFP_KERNEL | GFP_DMA, get_order(size)); + if (!page) + BUG(); + + ptr = dma_common_contiguous_remap(page, size, VM_ALLOC, + pgprot_noncached(PAGE_KERNEL), + __builtin_return_address(0)); + if (!ptr) + BUG(); + + ret = gen_pool_add_virt(atomic_pool, (unsigned long)ptr, + page_to_phys(page), atomic_pool_size, -1); + if (ret) + BUG(); + + gen_pool_set_algo(atomic_pool, gen_pool_first_fit_order_align, NULL); + + pr_info("DMA: preallocated %zu KiB pool for atomic coherent pool\n", + atomic_pool_size / 1024); + + pr_info("DMA: vaddr: 0x%x phy: 0x%lx,\n", (unsigned int)ptr, + page_to_phys(page)); + + return 0; +} +postcore_initcall(atomic_pool_init); + +static void *csky_dma_alloc_atomic(struct device *dev, size_t size, + dma_addr_t *dma_handle) +{ + unsigned long addr; + + addr = gen_pool_alloc(atomic_pool, size); + if (addr) + *dma_handle = gen_pool_virt_to_phys(atomic_pool, addr); + + return (void *)addr; +} + +static void csky_dma_free_atomic(struct device *dev, size_t size, void *vaddr, + dma_addr_t dma_handle, unsigned long attrs) +{ + gen_pool_free(atomic_pool, (unsigned long)vaddr, size); +} + +static void __dma_clear_buffer(struct page *page, size_t size) +{ + if (PageHighMem(page)) { + unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT; + + do { + void *ptr = kmap_atomic(page); + size_t _size = (size < PAGE_SIZE) ? size : PAGE_SIZE; + + memset(ptr, 0, _size); + dma_wbinv_range((unsigned long)ptr, + (unsigned long)ptr + _size); + + kunmap_atomic(ptr); + + page++; + size -= PAGE_SIZE; + count--; + } while (count); + } else { + void *ptr = page_address(page); + + memset(ptr, 0, size); + dma_wbinv_range((unsigned long)ptr, (unsigned long)ptr + size); + } +} + +static void *csky_dma_alloc_nonatomic(struct device *dev, size_t size, + dma_addr_t *dma_handle, gfp_t gfp, + unsigned long attrs) +{ + void *vaddr; + struct page *page; + unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT; + + if (DMA_ATTR_NON_CONSISTENT & attrs) { + pr_err("csky %s can't support DMA_ATTR_NON_CONSISTENT.\n", __func__); + return NULL; + } + + if (IS_ENABLED(CONFIG_DMA_CMA)) + page = dma_alloc_from_contiguous(dev, count, get_order(size), + gfp); + else + page = alloc_pages(gfp, get_order(size)); + + if (!page) { + pr_err("csky %s no more free pages.\n", __func__); + return NULL; + } + + *dma_handle = page_to_phys(page); + + __dma_clear_buffer(page, size); + + if (attrs & DMA_ATTR_NO_KERNEL_MAPPING) + return page; + + vaddr = dma_common_contiguous_remap(page, PAGE_ALIGN(size), VM_USERMAP, + pgprot_noncached(PAGE_KERNEL), __builtin_return_address(0)); + if (!vaddr) + BUG(); + + return vaddr; +} + +static void csky_dma_free_nonatomic( + struct device *dev, + size_t size, + void *vaddr, + dma_addr_t dma_handle, + unsigned long attrs + ) +{ + struct page *page = phys_to_page(dma_handle); + unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT; + + if ((unsigned int)vaddr >= VMALLOC_START) + dma_common_free_remap(vaddr, size, VM_USERMAP); + + if (IS_ENABLED(CONFIG_DMA_CMA)) + dma_release_from_contiguous(dev, page, count); + else + __free_pages(page, get_order(size)); +} + +void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle, + gfp_t gfp, unsigned long attrs) +{ + if (gfpflags_allow_blocking(gfp)) + return csky_dma_alloc_nonatomic(dev, size, dma_handle, gfp, + attrs); + else + return csky_dma_alloc_atomic(dev, size, dma_handle); +} + +void arch_dma_free(struct device *dev, size_t size, void *vaddr, + dma_addr_t dma_handle, unsigned long attrs) +{ + if (!addr_in_gen_pool(atomic_pool, (unsigned int) vaddr, size)) + csky_dma_free_nonatomic(dev, size, vaddr, dma_handle, attrs); + else + csky_dma_free_atomic(dev, size, vaddr, dma_handle, attrs); +} + +static inline void cache_op(phys_addr_t paddr, size_t size, + void (*fn)(unsigned long start, unsigned long end)) +{ + struct page *page = pfn_to_page(paddr >> PAGE_SHIFT); + unsigned int offset = paddr & ~PAGE_MASK; + size_t left = size; + unsigned long start; + + do { + size_t len = left; + + if (PageHighMem(page)) { + void *addr; + + if (offset + len > PAGE_SIZE) { + if (offset >= PAGE_SIZE) { + page += offset >> PAGE_SHIFT; + offset &= ~PAGE_MASK; + } + len = PAGE_SIZE - offset; + } + + addr = kmap_atomic(page); + start = (unsigned long)(addr + offset); + fn(start, start + len); + kunmap_atomic(addr); + } else { + start = (unsigned long)phys_to_virt(paddr); + fn(start, start + size); + } + offset = 0; + page++; + left -= len; + } while (left); +} + +void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr, + size_t size, enum dma_data_direction dir) +{ + switch (dir) { + case DMA_TO_DEVICE: + cache_op(paddr, size, dma_wb_range); + break; + case DMA_FROM_DEVICE: + case DMA_BIDIRECTIONAL: + cache_op(paddr, size, dma_wbinv_range); + break; + default: + BUG(); + } +} + +void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr, + size_t size, enum dma_data_direction dir) +{ + switch (dir) { + case DMA_TO_DEVICE: + cache_op(paddr, size, dma_wb_range); + break; + case DMA_FROM_DEVICE: + case DMA_BIDIRECTIONAL: + cache_op(paddr, size, dma_wbinv_range); + break; + default: + BUG(); + } +} diff --git a/arch/csky/mm/highmem.c b/arch/csky/mm/highmem.c new file mode 100644 index 0000000..e168ac0 --- /dev/null +++ b/arch/csky/mm/highmem.c @@ -0,0 +1,198 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. + +#include <linux/module.h> +#include <linux/highmem.h> +#include <linux/smp.h> +#include <linux/bootmem.h> +#include <asm/fixmap.h> +#include <asm/tlbflush.h> +#include <asm/cacheflush.h> + +static pte_t *kmap_pte; + +unsigned long highstart_pfn, highend_pfn; + +void *kmap(struct page *page) +{ + void *addr; + + might_sleep(); + if (!PageHighMem(page)) + return page_address(page); + addr = kmap_high(page); + flush_tlb_one((unsigned long)addr); + + return addr; +} +EXPORT_SYMBOL(kmap); + +void kunmap(struct page *page) +{ + BUG_ON(in_interrupt()); + if (!PageHighMem(page)) + return; + kunmap_high(page); +} +EXPORT_SYMBOL(kunmap); + +void *kmap_atomic(struct page *page) +{ + unsigned long vaddr; + int idx, type; + + preempt_disable(); + pagefault_disable(); + if (!PageHighMem(page)) + return page_address(page); + + type = kmap_atomic_idx_push(); + idx = type + KM_TYPE_NR*smp_processor_id(); + vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); +#ifdef CONFIG_DEBUG_HIGHMEM + BUG_ON(!pte_none(*(kmap_pte - idx))); +#endif + set_pte(kmap_pte-idx, mk_pte(page, PAGE_KERNEL)); + flush_tlb_one((unsigned long)vaddr); + + return (void *)vaddr; +} +EXPORT_SYMBOL(kmap_atomic); + +void __kunmap_atomic(void *kvaddr) +{ + unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK; + int idx; + + if (vaddr < FIXADDR_START) + goto out; + +#ifdef CONFIG_DEBUG_HIGHMEM + idx = KM_TYPE_NR*smp_processor_id() + kmap_atomic_idx(); + + BUG_ON(vaddr != __fix_to_virt(FIX_KMAP_BEGIN + idx)); + + pte_clear(&init_mm, vaddr, kmap_pte - idx); + flush_tlb_one(vaddr); +#else + (void) idx; /* to kill a warning */ +#endif + kmap_atomic_idx_pop(); +out: + pagefault_enable(); + preempt_enable(); +} +EXPORT_SYMBOL(__kunmap_atomic); + +/* + * This is the same as kmap_atomic() but can map memory that doesn't + * have a struct page associated with it. + */ +void *kmap_atomic_pfn(unsigned long pfn) +{ + unsigned long vaddr; + int idx, type; + + pagefault_disable(); + + type = kmap_atomic_idx_push(); + idx = type + KM_TYPE_NR*smp_processor_id(); + vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); + set_pte(kmap_pte-idx, pfn_pte(pfn, PAGE_KERNEL)); + flush_tlb_one(vaddr); + + return (void *) vaddr; +} + +struct page *kmap_atomic_to_page(void *ptr) +{ + unsigned long idx, vaddr = (unsigned long)ptr; + pte_t *pte; + + if (vaddr < FIXADDR_START) + return virt_to_page(ptr); + + idx = virt_to_fix(vaddr); + pte = kmap_pte - (idx - FIX_KMAP_BEGIN); + return pte_page(*pte); +} + +static void __init fixrange_init(unsigned long start, unsigned long end, + pgd_t *pgd_base) +{ +#ifdef CONFIG_HIGHMEM + pgd_t *pgd; + pud_t *pud; + pmd_t *pmd; + pte_t *pte; + int i, j, k; + unsigned long vaddr; + + vaddr = start; + i = __pgd_offset(vaddr); + j = __pud_offset(vaddr); + k = __pmd_offset(vaddr); + pgd = pgd_base + i; + + for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) { + pud = (pud_t *)pgd; + for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) { + pmd = (pmd_t *)pud; + for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) { + if (pmd_none(*pmd)) { + pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE); + set_pmd(pmd, __pmd(__pa(pte))); + BUG_ON(pte != pte_offset_kernel(pmd, 0)); + } + vaddr += PMD_SIZE; + } + k = 0; + } + j = 0; + } +#endif +} + +void __init fixaddr_kmap_pages_init(void) +{ + unsigned long vaddr; + pgd_t *pgd_base; +#ifdef CONFIG_HIGHMEM + pgd_t *pgd; + pmd_t *pmd; + pud_t *pud; + pte_t *pte; +#endif + pgd_base = swapper_pg_dir; + + /* + * Fixed mappings: + */ + vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK; + fixrange_init(vaddr, 0, pgd_base); + +#ifdef CONFIG_HIGHMEM + /* + * Permanent kmaps: + */ + vaddr = PKMAP_BASE; + fixrange_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base); + + pgd = swapper_pg_dir + __pgd_offset(vaddr); + pud = (pud_t *)pgd; + pmd = pmd_offset(pud, vaddr); + pte = pte_offset_kernel(pmd, vaddr); + pkmap_page_table = pte; +#endif +} + +void __init kmap_init(void) +{ + unsigned long vaddr; + + fixaddr_kmap_pages_init(); + + vaddr = __fix_to_virt(FIX_KMAP_BEGIN); + + kmap_pte = pte_offset_kernel((pmd_t *)pgd_offset_k(vaddr), vaddr); +} diff --git a/arch/csky/mm/init.c b/arch/csky/mm/init.c new file mode 100644 index 0000000..ce2711e --- /dev/null +++ b/arch/csky/mm/init.c @@ -0,0 +1,122 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. + +#include <linux/bug.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/signal.h> +#include <linux/sched.h> +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/string.h> +#include <linux/types.h> +#include <linux/pagemap.h> +#include <linux/ptrace.h> +#include <linux/mman.h> +#include <linux/mm.h> +#include <linux/bootmem.h> +#include <linux/highmem.h> +#include <linux/memblock.h> +#include <linux/swap.h> +#include <linux/proc_fs.h> +#include <linux/pfn.h> + +#include <asm/setup.h> +#include <asm/cachectl.h> +#include <asm/dma.h> +#include <asm/pgtable.h> +#include <asm/pgalloc.h> +#include <asm/mmu_context.h> +#include <asm/sections.h> +#include <asm/tlb.h> + +pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss; +pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned_bss; +unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] + __page_aligned_bss; +EXPORT_SYMBOL(empty_zero_page); + +void __init mem_init(void) +{ +#ifdef CONFIG_HIGHMEM + unsigned long tmp; + + max_mapnr = highend_pfn; +#else + max_mapnr = max_low_pfn; +#endif + high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT); + + free_all_bootmem(); + +#ifdef CONFIG_HIGHMEM + for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) { + struct page *page = pfn_to_page(tmp); + + /* FIXME not sure about */ + if (!memblock_is_reserved(tmp << PAGE_SHIFT)) + free_highmem_page(page); + } +#endif + mem_init_print_info(NULL); +} + +#ifdef CONFIG_BLK_DEV_INITRD +void free_initrd_mem(unsigned long start, unsigned long end) +{ + if (start < end) + pr_info("Freeing initrd memory: %ldk freed\n", + (end - start) >> 10); + + for (; start < end; start += PAGE_SIZE) { + ClearPageReserved(virt_to_page(start)); + init_page_count(virt_to_page(start)); + free_page(start); + totalram_pages++; + } +} +#endif + +extern char __init_begin[], __init_end[]; + +void free_initmem(void) +{ + unsigned long addr; + + addr = (unsigned long) &__init_begin; + + while (addr < (unsigned long) &__init_end) { + ClearPageReserved(virt_to_page(addr)); + init_page_count(virt_to_page(addr)); + free_page(addr); + totalram_pages++; + addr += PAGE_SIZE; + } + + pr_info("Freeing unused kernel memory: %dk freed\n", + ((unsigned int)&__init_end - (unsigned int)&__init_begin) >> 10); +} + +void pgd_init(unsigned long *p) +{ + int i; + + for (i = 0; i < PTRS_PER_PGD; i++) + p[i] = __pa(invalid_pte_table); +} + +void __init pre_mmu_init(void) +{ + /* + * Setup page-table and enable TLB-hardrefill + */ + flush_tlb_all(); + pgd_init((unsigned long *)swapper_pg_dir); + TLBMISS_HANDLER_SETUP_PGD(swapper_pg_dir); + TLBMISS_HANDLER_SETUP_PGD_KERNEL(swapper_pg_dir); + + asid_cache(smp_processor_id()) = ASID_FIRST_VERSION; + + /* Setup page mask to 4k */ + write_mmu_pagemask(0); +} diff --git a/arch/csky/mm/ioremap.c b/arch/csky/mm/ioremap.c new file mode 100644 index 0000000..7ad3ff1 --- /dev/null +++ b/arch/csky/mm/ioremap.c @@ -0,0 +1,48 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. + +#include <linux/export.h> +#include <linux/mm.h> +#include <linux/vmalloc.h> +#include <linux/io.h> + +#include <asm/pgtable.h> + +void __iomem *ioremap(phys_addr_t addr, size_t size) +{ + phys_addr_t last_addr; + unsigned long offset, vaddr; + struct vm_struct *area; + pgprot_t prot; + + last_addr = addr + size - 1; + if (!size || last_addr < addr) + return NULL; + + offset = addr & (~PAGE_MASK); + addr &= PAGE_MASK; + size = PAGE_ALIGN(size + offset); + + area = get_vm_area_caller(size, VM_ALLOC, __builtin_return_address(0)); + if (!area) + return NULL; + + vaddr = (unsigned long)area->addr; + + prot = __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | + _PAGE_GLOBAL | _CACHE_UNCACHED); + + if (ioremap_page_range(vaddr, vaddr + size, addr, prot)) { + free_vm_area(area); + return NULL; + } + + return (void __iomem *)(vaddr + offset); +} +EXPORT_SYMBOL(ioremap); + +void iounmap(void __iomem *addr) +{ + vunmap((void *)((unsigned long)addr & PAGE_MASK)); +} +EXPORT_SYMBOL(iounmap); -- 2.7.4
