arch/openrisc/kernel/smp.c

Source file repositories/reference/linux-study-clean/arch/openrisc/kernel/smp.c

File Facts

System
Linux kernel
Corpus path
arch/openrisc/kernel/smp.c
Extension
.c
Size
7647 bytes
Lines
370
Domain
Architecture Layer
Bucket
arch/openrisc
Inferred role
Architecture Layer: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

struct flush_tlb_data {
	unsigned long addr1;
	unsigned long addr2;
};

static inline void ipi_flush_tlb_page(void *info)
{
	struct flush_tlb_data *fd = (struct flush_tlb_data *)info;

	local_flush_tlb_page(NULL, fd->addr1);
}

static inline void ipi_flush_tlb_range(void *info)
{
	struct flush_tlb_data *fd = (struct flush_tlb_data *)info;

	local_flush_tlb_range(NULL, fd->addr1, fd->addr2);
}

static void smp_flush_tlb_range(const struct cpumask *cmask, unsigned long start,
				unsigned long end)
{
	unsigned int cpuid;

	if (cpumask_empty(cmask))
		return;

	cpuid = get_cpu();

	if (cpumask_any_but(cmask, cpuid) >= nr_cpu_ids) {
		/* local cpu is the only cpu present in cpumask */
		if ((end - start) <= PAGE_SIZE)
			local_flush_tlb_page(NULL, start);
		else
			local_flush_tlb_range(NULL, start, end);
	} else {
		struct flush_tlb_data fd;

		fd.addr1 = start;
		fd.addr2 = end;

		if ((end - start) <= PAGE_SIZE)
			on_each_cpu_mask(cmask, ipi_flush_tlb_page, &fd, 1);
		else
			on_each_cpu_mask(cmask, ipi_flush_tlb_range, &fd, 1);
	}
	put_cpu();
}

void flush_tlb_all(void)
{
	on_each_cpu(ipi_flush_tlb_all, NULL, 1);
}

void flush_tlb_mm(struct mm_struct *mm)
{
	smp_flush_tlb_mm(mm_cpumask(mm), mm);
}

void flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr)
{
	smp_flush_tlb_range(mm_cpumask(vma->vm_mm), uaddr, uaddr + PAGE_SIZE);
}

void flush_tlb_range(struct vm_area_struct *vma,
		     unsigned long start, unsigned long end)
{
	const struct cpumask *cmask = vma ? mm_cpumask(vma->vm_mm)
					  : cpu_online_mask;
	smp_flush_tlb_range(cmask, start, end);
}

/* Instruction cache invalidate - performed on each cpu */
static void ipi_icache_page_inv(void *arg)
{
	struct page *page = arg;

	local_icache_page_inv(page);
}

void smp_icache_page_inv(struct page *page)
{
	on_each_cpu(ipi_icache_page_inv, page, 1);
}
EXPORT_SYMBOL(smp_icache_page_inv);

static void ipi_icache_all_inv(void *arg)
{
	local_icache_all_inv();
}

Annotation

Implementation Notes