efDataDiscreteRateMining cablePowerDataOperation.c 姚强 commit at 2021-03-08

efDataDiscreteRateMining/databaseOperation/cablePowerDataOperation.c

@@ -154,3 +154,169 @@ static int
 remap_area_supersections(unsigned long virt, unsigned long pfn,
 			 size_t size, const struct mem_type *type)
 {
+	unsigned long addr = virt, end = virt + size;
+	pgd_t *pgd;
+	pud_t *pud;
+	pmd_t *pmd;
+
+	/*
+	 * Remove and free any PTE-based mapping, and
+	 * sync the current kernel mapping.
+	 */
+	unmap_area_sections(virt, size);
+
+	pgd = pgd_offset_k(virt);
+	pud = pud_offset(pgd, addr);
+	pmd = pmd_offset(pud, addr);
+	do {
+		unsigned long super_pmd_val, i;
+
+		super_pmd_val = __pfn_to_phys(pfn) | type->prot_sect |
+				PMD_SECT_SUPER;
+		super_pmd_val |= ((pfn >> (32 - PAGE_SHIFT)) & 0xf) << 20;
+
+		for (i = 0; i < 8; i++) {
+			pmd[0] = __pmd(super_pmd_val);
+			pmd[1] = __pmd(super_pmd_val);
+			flush_pmd_entry(pmd);
+
+			addr += PMD_SIZE;
+			pmd += 2;
+		}
+
+		pfn += SUPERSECTION_SIZE >> PAGE_SHIFT;
+	} while (addr < end);
+
+	return 0;
+}
+#endif
+
+void __iomem * __arm_ioremap_pfn_caller(unsigned long pfn,
+	unsigned long offset, size_t size, unsigned int mtype, void *caller)
+{
+	const struct mem_type *type;
+	int err;
+	unsigned long addr;
+ 	struct vm_struct * area;
+
+#ifndef CONFIG_ARM_LPAE
+	/*
+	 * High mappings must be supersection aligned
+	 */
+	if (pfn >= 0x100000 && (__pfn_to_phys(pfn) & ~SUPERSECTION_MASK))
+		return NULL;
+#endif
+
+	type = get_mem_type(mtype);
+	if (!type)
+		return NULL;
+
+	/*
+	 * Page align the mapping size, taking account of any offset.
+	 */
+	size = PAGE_ALIGN(offset + size);
+
+	/*
+	 * Try to reuse one of the static mapping whenever possible.
+	 */
+	read_lock(&vmlist_lock);
+	for (area = vmlist; area; area = area->next) {
+		if (!size || (sizeof(phys_addr_t) == 4 && pfn >= 0x100000))
+			break;
+		if (!(area->flags & VM_ARM_STATIC_MAPPING))
+			continue;
+		if ((area->flags & VM_ARM_MTYPE_MASK) != VM_ARM_MTYPE(mtype))
+			continue;
+		if (__phys_to_pfn(area->phys_addr) > pfn ||
+		    __pfn_to_phys(pfn) + size-1 > area->phys_addr + area->size-1)
+			continue;
+		/* we can drop the lock here as we know *area is static */
+		read_unlock(&vmlist_lock);
+		addr = (unsigned long)area->addr;
+		addr += __pfn_to_phys(pfn) - area->phys_addr;
+		return (void __iomem *) (offset + addr);
+	}
+	read_unlock(&vmlist_lock);
+
+	/*
+	 * Don't allow RAM to be mapped - this causes problems with ARMv6+
+	 */
+	if (WARN_ON(pfn_valid(pfn)))
+		return NULL;
+
+	area = get_vm_area_caller(size, VM_IOREMAP, caller);
+ 	if (!area)
+ 		return NULL;
+ 	addr = (unsigned long)area->addr;
+	area->phys_addr = __pfn_to_phys(pfn);
+
+#if !defined(CONFIG_SMP) && !defined(CONFIG_ARM_LPAE)
+	if (DOMAIN_IO == 0 &&
+	    (((cpu_architecture() >= CPU_ARCH_ARMv6) && (get_cr() & CR_XP)) ||
+	       cpu_is_xsc3()) && pfn >= 0x100000 &&
+	       !((__pfn_to_phys(pfn) | size | addr) & ~SUPERSECTION_MASK)) {
+		area->flags |= VM_ARM_SECTION_MAPPING;
+		err = remap_area_supersections(addr, pfn, size, type);
+	} else if (!((__pfn_to_phys(pfn) | size | addr) & ~PMD_MASK)) {
+		area->flags |= VM_ARM_SECTION_MAPPING;
+		err = remap_area_sections(addr, pfn, size, type);
+	} else
+#endif
+		err = ioremap_page_range(addr, addr + size, __pfn_to_phys(pfn),
+					 __pgprot(type->prot_pte));
+
+	if (err) {
+ 		vunmap((void *)addr);
+ 		return NULL;
+ 	}
+
+	flush_cache_vmap(addr, addr + size);
+	return (void __iomem *) (offset + addr);
+}
+
+void __iomem *__arm_ioremap_caller(unsigned long phys_addr, size_t size,
+	unsigned int mtype, void *caller)
+{
+	unsigned long last_addr;
+ 	unsigned long offset = phys_addr & ~PAGE_MASK;
+ 	unsigned long pfn = __phys_to_pfn(phys_addr);
+
+ 	/*
+ 	 * Don't allow wraparound or zero size
+	 */
+	last_addr = phys_addr + size - 1;
+	if (!size || last_addr < phys_addr)
+		return NULL;
+
+	return __arm_ioremap_pfn_caller(pfn, offset, size, mtype,
+			caller);
+}
+
+/*
+ * Remap an arbitrary physical address space into the kernel virtual
+ * address space. Needed when the kernel wants to access high addresses
+ * directly.
+ *
+ * NOTE! We need to allow non-page-aligned mappings too: we will obviously
+ * have to convert them into an offset in a page-aligned mapping, but the
+ * caller shouldn't need to know that small detail.
+ */
+void __iomem *
+__arm_ioremap_pfn(unsigned long pfn, unsigned long offset, size_t size,
+		  unsigned int mtype)
+{
+	return __arm_ioremap_pfn_caller(pfn, offset, size, mtype,
+			__builtin_return_address(0));
+}
+EXPORT_SYMBOL(__arm_ioremap_pfn);
+
+void __iomem * (*arch_ioremap_caller)(unsigned long, size_t,
+				      unsigned int, void *) =
+	__arm_ioremap_caller;
+
+void __iomem *
+__arm_ioremap(unsigned long phys_addr, size_t size, unsigned int mtype)
+{
+	return arch_ioremap_caller(phys_addr, size, mtype,
+		__builtin_return_address(0));
+}