Merge tag 'riscv-for-linus-6.11-mw1' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux

Pull RISC-V updates from Palmer Dabbelt: - Support for various new ISA extensions: * The Zve32[xf] and Zve64[xfd] sub-extensios of the vector extension * Zimop and Zcmop for may-be-operations * The Zca, Zcf, Zcd and Zcb sub-extensions of the C extension * Zawrs - riscv,cpu-intc is now dtschema - A handful of performance improvements and cleanups to text patching - Support for memory hot{,un}plug - The highest user-allocatable virtual address is now visible in hwprobe * tag 'riscv-for-linus-6.11-mw1' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux: (58 commits) riscv: lib: relax assembly constraints in hweight riscv: set trap vector earlier KVM: riscv: selftests: Add Zawrs extension to get-reg-list test KVM: riscv: Support guest wrs.nto riscv: hwprobe: export Zawrs ISA extension riscv: Add Zawrs support for spinlocks dt-bindings: riscv: Add Zawrs ISA extension description riscv: Provide a definition for 'pause' riscv: hwprobe: export highest virtual userspace address riscv: Improve sbi_ecall() code generation by reordering arguments riscv: Add tracepoints for SBI calls and returns riscv: Optimize crc32 with Zbc extension riscv: Enable DAX VMEMMAP optimization riscv: mm: Add support for ZONE_DEVICE virtio-mem: Enable virtio-mem for RISC-V riscv: Enable memory hotplugging for RISC-V riscv: mm: Take memory hotplug read-lock during kernel page table dump riscv: mm: Add memory hotplugging support riscv: mm: Add pfn_to_kaddr() implementation riscv: mm: Refactor create_linear_mapping_range() for memory hot add ...
2026-04-18 06:44:00 -04:00 · 2024-07-20 09:11:27 -07:00
parent d2be38b9a5 93b63f68d0
commit f557af081d
54 changed files with 1643 additions and 326 deletions
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -28,6 +28,7 @@

 #include <asm/fixmap.h>
 #include <asm/io.h>
+#include <asm/kasan.h>
 #include <asm/numa.h>
 #include <asm/pgtable.h>
 #include <asm/sections.h>
@@ -296,7 +297,7 @@ static void __init setup_bootmem(void)
 }

 #ifdef CONFIG_MMU
-struct pt_alloc_ops pt_ops __initdata;
+struct pt_alloc_ops pt_ops __meminitdata;

 pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
 pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
@@ -358,7 +359,7 @@ static inline pte_t *__init get_pte_virt_fixmap(phys_addr_t pa)
 	return (pte_t *)set_fixmap_offset(FIX_PTE, pa);
 }

-static inline pte_t *__init get_pte_virt_late(phys_addr_t pa)
+static inline pte_t *__meminit get_pte_virt_late(phys_addr_t pa)
 {
 	return (pte_t *) __va(pa);
 }
@@ -377,7 +378,7 @@ static inline phys_addr_t __init alloc_pte_fixmap(uintptr_t va)
 	return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
 }

-static phys_addr_t __init alloc_pte_late(uintptr_t va)
+static phys_addr_t __meminit alloc_pte_late(uintptr_t va)
 {
 	struct ptdesc *ptdesc = pagetable_alloc(GFP_KERNEL & ~__GFP_HIGHMEM, 0);

@@ -385,9 +386,8 @@ static phys_addr_t __init alloc_pte_late(uintptr_t va)
 	return __pa((pte_t *)ptdesc_address(ptdesc));
 }

-static void __init create_pte_mapping(pte_t *ptep,
-				      uintptr_t va, phys_addr_t pa,
-				      phys_addr_t sz, pgprot_t prot)
+static void __meminit create_pte_mapping(pte_t *ptep, uintptr_t va, phys_addr_t pa, phys_addr_t sz,
+					 pgprot_t prot)
 {
 	uintptr_t pte_idx = pte_index(va);

@@ -441,7 +441,7 @@ static pmd_t *__init get_pmd_virt_fixmap(phys_addr_t pa)
 	return (pmd_t *)set_fixmap_offset(FIX_PMD, pa);
 }

-static pmd_t *__init get_pmd_virt_late(phys_addr_t pa)
+static pmd_t *__meminit get_pmd_virt_late(phys_addr_t pa)
 {
 	return (pmd_t *) __va(pa);
 }
@@ -458,7 +458,7 @@ static phys_addr_t __init alloc_pmd_fixmap(uintptr_t va)
 	return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
 }

-static phys_addr_t __init alloc_pmd_late(uintptr_t va)
+static phys_addr_t __meminit alloc_pmd_late(uintptr_t va)
 {
 	struct ptdesc *ptdesc = pagetable_alloc(GFP_KERNEL & ~__GFP_HIGHMEM, 0);

@@ -466,9 +466,9 @@ static phys_addr_t __init alloc_pmd_late(uintptr_t va)
 	return __pa((pmd_t *)ptdesc_address(ptdesc));
 }

-static void __init create_pmd_mapping(pmd_t *pmdp,
-				      uintptr_t va, phys_addr_t pa,
-				      phys_addr_t sz, pgprot_t prot)
+static void __meminit create_pmd_mapping(pmd_t *pmdp,
+					 uintptr_t va, phys_addr_t pa,
+					 phys_addr_t sz, pgprot_t prot)
 {
 	pte_t *ptep;
 	phys_addr_t pte_phys;
@@ -504,7 +504,7 @@ static pud_t *__init get_pud_virt_fixmap(phys_addr_t pa)
 	return (pud_t *)set_fixmap_offset(FIX_PUD, pa);
 }

-static pud_t *__init get_pud_virt_late(phys_addr_t pa)
+static pud_t *__meminit get_pud_virt_late(phys_addr_t pa)
 {
 	return (pud_t *)__va(pa);
 }
@@ -522,7 +522,7 @@ static phys_addr_t __init alloc_pud_fixmap(uintptr_t va)
 	return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
 }

-static phys_addr_t alloc_pud_late(uintptr_t va)
+static phys_addr_t __meminit alloc_pud_late(uintptr_t va)
 {
 	unsigned long vaddr;

@@ -542,7 +542,7 @@ static p4d_t *__init get_p4d_virt_fixmap(phys_addr_t pa)
 	return (p4d_t *)set_fixmap_offset(FIX_P4D, pa);
 }

-static p4d_t *__init get_p4d_virt_late(phys_addr_t pa)
+static p4d_t *__meminit get_p4d_virt_late(phys_addr_t pa)
 {
 	return (p4d_t *)__va(pa);
 }
@@ -560,7 +560,7 @@ static phys_addr_t __init alloc_p4d_fixmap(uintptr_t va)
 	return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
 }

-static phys_addr_t alloc_p4d_late(uintptr_t va)
+static phys_addr_t __meminit alloc_p4d_late(uintptr_t va)
 {
 	unsigned long vaddr;

@@ -569,9 +569,8 @@ static phys_addr_t alloc_p4d_late(uintptr_t va)
 	return __pa(vaddr);
 }

-static void __init create_pud_mapping(pud_t *pudp,
-				      uintptr_t va, phys_addr_t pa,
-				      phys_addr_t sz, pgprot_t prot)
+static void __meminit create_pud_mapping(pud_t *pudp, uintptr_t va, phys_addr_t pa, phys_addr_t sz,
+					 pgprot_t prot)
 {
 	pmd_t *nextp;
 	phys_addr_t next_phys;
@@ -596,9 +595,8 @@ static void __init create_pud_mapping(pud_t *pudp,
 	create_pmd_mapping(nextp, va, pa, sz, prot);
 }

-static void __init create_p4d_mapping(p4d_t *p4dp,
-				      uintptr_t va, phys_addr_t pa,
-				      phys_addr_t sz, pgprot_t prot)
+static void __meminit create_p4d_mapping(p4d_t *p4dp, uintptr_t va, phys_addr_t pa, phys_addr_t sz,
+					 pgprot_t prot)
 {
 	pud_t *nextp;
 	phys_addr_t next_phys;
@@ -654,9 +652,8 @@ static void __init create_p4d_mapping(p4d_t *p4dp,
 #define create_pmd_mapping(__pmdp, __va, __pa, __sz, __prot) do {} while(0)
 #endif /* __PAGETABLE_PMD_FOLDED */

-void __init create_pgd_mapping(pgd_t *pgdp,
-				      uintptr_t va, phys_addr_t pa,
-				      phys_addr_t sz, pgprot_t prot)
+void __meminit create_pgd_mapping(pgd_t *pgdp, uintptr_t va, phys_addr_t pa, phys_addr_t sz,
+				  pgprot_t prot)
 {
 	pgd_next_t *nextp;
 	phys_addr_t next_phys;
@@ -681,8 +678,7 @@ void __init create_pgd_mapping(pgd_t *pgdp,
 	create_pgd_next_mapping(nextp, va, pa, sz, prot);
 }

-static uintptr_t __init best_map_size(phys_addr_t pa, uintptr_t va,
-				      phys_addr_t size)
+static uintptr_t __meminit best_map_size(phys_addr_t pa, uintptr_t va, phys_addr_t size)
 {
 	if (debug_pagealloc_enabled())
 		return PAGE_SIZE;
@@ -718,7 +714,7 @@ asmlinkage void __init __copy_data(void)
 #endif

 #ifdef CONFIG_STRICT_KERNEL_RWX
-static __init pgprot_t pgprot_from_va(uintptr_t va)
+static __meminit pgprot_t pgprot_from_va(uintptr_t va)
 {
 	if (is_va_kernel_text(va))
 		return PAGE_KERNEL_READ_EXEC;
@@ -743,7 +739,7 @@ void mark_rodata_ro(void)
 				  set_memory_ro);
 }
 #else
-static __init pgprot_t pgprot_from_va(uintptr_t va)
+static __meminit pgprot_t pgprot_from_va(uintptr_t va)
 {
 	if (IS_ENABLED(CONFIG_64BIT) && !is_kernel_mapping(va))
 		return PAGE_KERNEL;
@@ -1235,9 +1231,8 @@ asmlinkage void __init setup_vm(uintptr_t dtb_pa)
 	pt_ops_set_fixmap();
 }

-static void __init create_linear_mapping_range(phys_addr_t start,
-					       phys_addr_t end,
-					       uintptr_t fixed_map_size)
+static void __meminit create_linear_mapping_range(phys_addr_t start, phys_addr_t end,
+						  uintptr_t fixed_map_size, const pgprot_t *pgprot)
 {
 	phys_addr_t pa;
 	uintptr_t va, map_size;
@@ -1248,7 +1243,7 @@ static void __init create_linear_mapping_range(phys_addr_t start,
 					    best_map_size(pa, va, end - pa);

 		create_pgd_mapping(swapper_pg_dir, va, pa, map_size,
-				   pgprot_from_va(va));
+				   pgprot ? *pgprot : pgprot_from_va(va));
 	}
 }

@@ -1292,22 +1287,19 @@ static void __init create_linear_mapping_page_table(void)
 		if (end >= __pa(PAGE_OFFSET) + memory_limit)
 			end = __pa(PAGE_OFFSET) + memory_limit;

-		create_linear_mapping_range(start, end, 0);
+		create_linear_mapping_range(start, end, 0, NULL);
 	}

 #ifdef CONFIG_STRICT_KERNEL_RWX
-	create_linear_mapping_range(ktext_start, ktext_start + ktext_size, 0);
-	create_linear_mapping_range(krodata_start,
-				    krodata_start + krodata_size, 0);
+	create_linear_mapping_range(ktext_start, ktext_start + ktext_size, 0, NULL);
+	create_linear_mapping_range(krodata_start, krodata_start + krodata_size, 0, NULL);

 	memblock_clear_nomap(ktext_start,  ktext_size);
 	memblock_clear_nomap(krodata_start, krodata_size);
 #endif

 #ifdef CONFIG_KFENCE
-	create_linear_mapping_range(kfence_pool,
-				    kfence_pool + KFENCE_POOL_SIZE,
-				    PAGE_SIZE);
+	create_linear_mapping_range(kfence_pool, kfence_pool + KFENCE_POOL_SIZE, PAGE_SIZE, NULL);

 	memblock_clear_nomap(kfence_pool, KFENCE_POOL_SIZE);
 #endif
@@ -1439,7 +1431,7 @@ int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
 	 * memory hotplug, we are not able to update all the page tables with
 	 * the new PMDs.
 	 */
-	return vmemmap_populate_hugepages(start, end, node, NULL);
+	return vmemmap_populate_hugepages(start, end, node, altmap);
 }
 #endif

@@ -1493,11 +1485,19 @@ failed:
 	panic("Failed to pre-allocate %s pages for %s area\n", lvl, area);
 }

+#define PAGE_END KASAN_SHADOW_START
+
 void __init pgtable_cache_init(void)
 {
 	preallocate_pgd_pages_range(VMALLOC_START, VMALLOC_END, "vmalloc");
 	if (IS_ENABLED(CONFIG_MODULES))
 		preallocate_pgd_pages_range(MODULES_VADDR, MODULES_END, "bpf/modules");
+	if (IS_ENABLED(CONFIG_MEMORY_HOTPLUG)) {
+		preallocate_pgd_pages_range(VMEMMAP_START, VMEMMAP_END, "vmemmap");
+		preallocate_pgd_pages_range(PAGE_OFFSET, PAGE_END, "direct map");
+		if (IS_ENABLED(CONFIG_KASAN))
+			preallocate_pgd_pages_range(KASAN_SHADOW_START, KASAN_SHADOW_END, "kasan");
+	}
 }
 #endif

@@ -1534,3 +1534,270 @@ struct execmem_info __init *execmem_arch_setup(void)
 }
 #endif /* CONFIG_MMU */
 #endif /* CONFIG_EXECMEM */
+
+#ifdef CONFIG_MEMORY_HOTPLUG
+static void __meminit free_pte_table(pte_t *pte_start, pmd_t *pmd)
+{
+	struct page *page = pmd_page(*pmd);
+	struct ptdesc *ptdesc = page_ptdesc(page);
+	pte_t *pte;
+	int i;
+
+	for (i = 0; i < PTRS_PER_PTE; i++) {
+		pte = pte_start + i;
+		if (!pte_none(*pte))
+			return;
+	}
+
+	pagetable_pte_dtor(ptdesc);
+	if (PageReserved(page))
+		free_reserved_page(page);
+	else
+		pagetable_free(ptdesc);
+	pmd_clear(pmd);
+}
+
+static void __meminit free_pmd_table(pmd_t *pmd_start, pud_t *pud)
+{
+	struct page *page = pud_page(*pud);
+	struct ptdesc *ptdesc = page_ptdesc(page);
+	pmd_t *pmd;
+	int i;
+
+	for (i = 0; i < PTRS_PER_PMD; i++) {
+		pmd = pmd_start + i;
+		if (!pmd_none(*pmd))
+			return;
+	}
+
+	pagetable_pmd_dtor(ptdesc);
+	if (PageReserved(page))
+		free_reserved_page(page);
+	else
+		pagetable_free(ptdesc);
+	pud_clear(pud);
+}
+
+static void __meminit free_pud_table(pud_t *pud_start, p4d_t *p4d)
+{
+	struct page *page = p4d_page(*p4d);
+	pud_t *pud;
+	int i;
+
+	for (i = 0; i < PTRS_PER_PUD; i++) {
+		pud = pud_start + i;
+		if (!pud_none(*pud))
+			return;
+	}
+
+	if (PageReserved(page))
+		free_reserved_page(page);
+	else
+		free_pages((unsigned long)page_address(page), 0);
+	p4d_clear(p4d);
+}
+
+static void __meminit free_vmemmap_storage(struct page *page, size_t size,
+					   struct vmem_altmap *altmap)
+{
+	int order = get_order(size);
+
+	if (altmap) {
+		vmem_altmap_free(altmap, size >> PAGE_SHIFT);
+		return;
+	}
+
+	if (PageReserved(page)) {
+		unsigned int nr_pages = 1 << order;
+
+		while (nr_pages--)
+			free_reserved_page(page++);
+		return;
+	}
+
+	free_pages((unsigned long)page_address(page), order);
+}
+
+static void __meminit remove_pte_mapping(pte_t *pte_base, unsigned long addr, unsigned long end,
+					 bool is_vmemmap, struct vmem_altmap *altmap)
+{
+	unsigned long next;
+	pte_t *ptep, pte;
+
+	for (; addr < end; addr = next) {
+		next = (addr + PAGE_SIZE) & PAGE_MASK;
+		if (next > end)
+			next = end;
+
+		ptep = pte_base + pte_index(addr);
+		pte = ptep_get(ptep);
+		if (!pte_present(*ptep))
+			continue;
+
+		pte_clear(&init_mm, addr, ptep);
+		if (is_vmemmap)
+			free_vmemmap_storage(pte_page(pte), PAGE_SIZE, altmap);
+	}
+}
+
+static void __meminit remove_pmd_mapping(pmd_t *pmd_base, unsigned long addr, unsigned long end,
+					 bool is_vmemmap, struct vmem_altmap *altmap)
+{
+	unsigned long next;
+	pte_t *pte_base;
+	pmd_t *pmdp, pmd;
+
+	for (; addr < end; addr = next) {
+		next = pmd_addr_end(addr, end);
+		pmdp = pmd_base + pmd_index(addr);
+		pmd = pmdp_get(pmdp);
+		if (!pmd_present(pmd))
+			continue;
+
+		if (pmd_leaf(pmd)) {
+			pmd_clear(pmdp);
+			if (is_vmemmap)
+				free_vmemmap_storage(pmd_page(pmd), PMD_SIZE, altmap);
+			continue;
+		}
+
+		pte_base = (pte_t *)pmd_page_vaddr(*pmdp);
+		remove_pte_mapping(pte_base, addr, next, is_vmemmap, altmap);
+		free_pte_table(pte_base, pmdp);
+	}
+}
+
+static void __meminit remove_pud_mapping(pud_t *pud_base, unsigned long addr, unsigned long end,
+					 bool is_vmemmap, struct vmem_altmap *altmap)
+{
+	unsigned long next;
+	pud_t *pudp, pud;
+	pmd_t *pmd_base;
+
+	for (; addr < end; addr = next) {
+		next = pud_addr_end(addr, end);
+		pudp = pud_base + pud_index(addr);
+		pud = pudp_get(pudp);
+		if (!pud_present(pud))
+			continue;
+
+		if (pud_leaf(pud)) {
+			if (pgtable_l4_enabled) {
+				pud_clear(pudp);
+				if (is_vmemmap)
+					free_vmemmap_storage(pud_page(pud), PUD_SIZE, altmap);
+			}
+			continue;
+		}
+
+		pmd_base = pmd_offset(pudp, 0);
+		remove_pmd_mapping(pmd_base, addr, next, is_vmemmap, altmap);
+
+		if (pgtable_l4_enabled)
+			free_pmd_table(pmd_base, pudp);
+	}
+}
+
+static void __meminit remove_p4d_mapping(p4d_t *p4d_base, unsigned long addr, unsigned long end,
+					 bool is_vmemmap, struct vmem_altmap *altmap)
+{
+	unsigned long next;
+	p4d_t *p4dp, p4d;
+	pud_t *pud_base;
+
+	for (; addr < end; addr = next) {
+		next = p4d_addr_end(addr, end);
+		p4dp = p4d_base + p4d_index(addr);
+		p4d = p4dp_get(p4dp);
+		if (!p4d_present(p4d))
+			continue;
+
+		if (p4d_leaf(p4d)) {
+			if (pgtable_l5_enabled) {
+				p4d_clear(p4dp);
+				if (is_vmemmap)
+					free_vmemmap_storage(p4d_page(p4d), P4D_SIZE, altmap);
+			}
+			continue;
+		}
+
+		pud_base = pud_offset(p4dp, 0);
+		remove_pud_mapping(pud_base, addr, next, is_vmemmap, altmap);
+
+		if (pgtable_l5_enabled)
+			free_pud_table(pud_base, p4dp);
+	}
+}
+
+static void __meminit remove_pgd_mapping(unsigned long va, unsigned long end, bool is_vmemmap,
+					 struct vmem_altmap *altmap)
+{
+	unsigned long addr, next;
+	p4d_t *p4d_base;
+	pgd_t *pgd;
+
+	for (addr = va; addr < end; addr = next) {
+		next = pgd_addr_end(addr, end);
+		pgd = pgd_offset_k(addr);
+
+		if (!pgd_present(*pgd))
+			continue;
+
+		if (pgd_leaf(*pgd))
+			continue;
+
+		p4d_base = p4d_offset(pgd, 0);
+		remove_p4d_mapping(p4d_base, addr, next, is_vmemmap, altmap);
+	}
+
+	flush_tlb_all();
+}
+
+static void __meminit remove_linear_mapping(phys_addr_t start, u64 size)
+{
+	unsigned long va = (unsigned long)__va(start);
+	unsigned long end = (unsigned long)__va(start + size);
+
+	remove_pgd_mapping(va, end, false, NULL);
+}
+
+struct range arch_get_mappable_range(void)
+{
+	struct range mhp_range;
+
+	mhp_range.start = __pa(PAGE_OFFSET);
+	mhp_range.end = __pa(PAGE_END - 1);
+	return mhp_range;
+}
+
+int __ref arch_add_memory(int nid, u64 start, u64 size, struct mhp_params *params)
+{
+	int ret = 0;
+
+	create_linear_mapping_range(start, start + size, 0, &params->pgprot);
+	ret = __add_pages(nid, start >> PAGE_SHIFT, size >> PAGE_SHIFT, params);
+	if (ret) {
+		remove_linear_mapping(start, size);
+		goto out;
+	}
+
+	max_pfn = PFN_UP(start + size);
+	max_low_pfn = max_pfn;
+
+ out:
+	flush_tlb_all();
+	return ret;
+}
+
+void __ref arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)
+{
+	__remove_pages(start >> PAGE_SHIFT, size >> PAGE_SHIFT, altmap);
+	remove_linear_mapping(start, size);
+	flush_tlb_all();
+}
+
+void __ref vmemmap_free(unsigned long start, unsigned long end, struct vmem_altmap *altmap)
+{
+	remove_pgd_mapping(start, end, true, altmap);
+}
+#endif /* CONFIG_MEMORY_HOTPLUG */