static __init int register_e820_pmem(void)
{
struct platform_device *pdev;
int rc;
rc = walk_iomem_res_desc(IORES_DESC_PERSISTENT_MEMORY_LEGACY,
IORESOURCE_MEM, 0, -1, NULL, found);
if (rc <= 0)
return 0;
/*
* See drivers/nvdimm/e820.c for the implementation, this is
* simply here to trigger the module to load on demand.
*/
pdev = platform_device_alloc("e820_pmem", -1);
return platform_device_add(pdev);
}
/*
* Helper function for placing a buffer in a kexec segment. This assumes
* that kexec_mutex is held.
*/
int kexec_add_buffer(struct kimage *image, char *buffer, unsigned long bufsz,
unsigned long memsz, unsigned long buf_align,
unsigned long buf_min, unsigned long buf_max,
bool top_down, unsigned long *load_addr)
{
struct kexec_segment *ksegment;
struct kexec_buf buf, *kbuf;
int ret;
/* Currently adding segment this way is allowed only in file mode */
if (!image->file_mode)
return -EINVAL;
if (image->nr_segments >= KEXEC_SEGMENT_MAX)
return -EINVAL;
/*
* Make sure we are not trying to add buffer after allocating
* control pages. All segments need to be placed first before
* any control pages are allocated. As control page allocation
* logic goes through list of segments to make sure there are
* no destination overlaps.
*/
if (!list_empty(&image->control_pages)) {
WARN_ON(1);
return -EINVAL;
}
memset(&buf, 0, sizeof(struct kexec_buf));
kbuf = &buf;
kbuf->image = image;
kbuf->buffer = buffer;
kbuf->bufsz = bufsz;
kbuf->memsz = ALIGN(memsz, PAGE_SIZE);
kbuf->buf_align = max(buf_align, PAGE_SIZE);
kbuf->buf_min = buf_min;
kbuf->buf_max = buf_max;
kbuf->top_down = top_down;
/* Walk the RAM ranges and allocate a suitable range for the buffer */
if (image->type == KEXEC_TYPE_CRASH)
ret = walk_iomem_res_desc(crashk_res.desc,
IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY,
crashk_res.start, crashk_res.end, kbuf,
locate_mem_hole_callback);
else
ret = walk_system_ram_res(0, -1, kbuf,
locate_mem_hole_callback);
if (ret != 1) {
/* A suitable memory range could not be found for buffer */
return -EADDRNOTAVAIL;
}
/* Found a suitable memory range */
ksegment = &image->segment[image->nr_segments];
ksegment->kbuf = kbuf->buffer;
ksegment->bufsz = kbuf->bufsz;
ksegment->mem = kbuf->mem;
ksegment->memsz = kbuf->memsz;
image->nr_segments++;
*load_addr = ksegment->mem;
return 0;
}
