arch/parisc/kernel/pdt.c

Source file repositories/reference/linux-study-clean/arch/parisc/kernel/pdt.c

File Facts

System
Linux kernel
Corpus path
arch/parisc/kernel/pdt.c
Extension
.c
Size
9270 bytes
Lines
364
Domain
Architecture Layer
Bucket
arch/parisc
Inferred role
Architecture Layer: implementation source
Status
source 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

switch (pdt_type) {
		case PDT_PAT_NEW:
			ret = get_info_pat_new();
			break;
		case PDT_PAT_CELL:
			ret = get_info_pat_cell();
			break;
		default:
			ret = pdc_mem_pdt_info(&pdt_status);
			break;
		}

		if (ret != PDC_OK) {
			pr_warn("PDT: unexpected failure %d\n", ret);
			return -EINVAL;
		}

		/* if no new PDT entries, just wait again */
		num = pdt_status.pdt_entries - old_num_entries;
		if (num <= 0)
			continue;

		/* decrease poll interval in case we found memory errors */
		if (pdt_status.pdt_entries &&
			pdt_poll_interval == PDT_POLL_INTERVAL_DEFAULT)
			pdt_poll_interval = PDT_POLL_INTERVAL_SHORT;

		/* limit entries to get */
		if (num > MAX_PDT_ENTRIES) {
			num = MAX_PDT_ENTRIES;
			pdt_status.pdt_entries = old_num_entries + num;
		}

		/* get new entries */
		switch (pdt_type) {
#ifdef CONFIG_64BIT
		case PDT_PAT_CELL:
			if (pdt_status.pdt_entries > MAX_PDT_ENTRIES) {
				pr_crit("PDT: too many entries.\n");
				return -ENOMEM;
			}
			ret = pdc_pat_mem_read_cell_pdt(&pat_pret, pdt_entry,
				MAX_PDT_ENTRIES);
			bad_mem_ptr = &pdt_entry[old_num_entries];
			break;
		case PDT_PAT_NEW:
			ret = pdc_pat_mem_read_pd_pdt(&pat_pret,
				pdt_entry,
				num * sizeof(unsigned long),
				old_num_entries * sizeof(unsigned long));
			bad_mem_ptr = &pdt_entry[0];
			break;
#endif
		default:
			ret = pdc_mem_pdt_read_entries(&pdt_read_ret,
				pdt_entry);
			bad_mem_ptr = &pdt_entry[old_num_entries];
			break;
		}

		/* report and mark memory broken */
		while (num--) {
			unsigned long pde = *bad_mem_ptr++;

			report_mem_err(pde);

#ifdef CONFIG_MEMORY_FAILURE
			if ((pde & PDT_ADDR_PERM_ERR) ||
			    ((pde & PDT_ADDR_SINGLE_ERR) == 0))
				memory_failure(pde >> PAGE_SHIFT, 0);
			else
				soft_offline_page(pde >> PAGE_SHIFT, 0);
#else
			pr_crit("PDT: memory error at 0x%lx ignored.\n"
				"Rebuild kernel with CONFIG_MEMORY_FAILURE=y "
				"for real handling.\n",
				pde & PDT_ADDR_PHYS_MASK);
#endif

		}
	}

	return 0;
}


static int __init pdt_initcall(void)
{
	struct task_struct *kpdtd_task;

Annotation

Implementation Notes