On Wed, Mar 25, 2015 at 9:04 AM, Christoph Hellwig <hch@xxxxxx> wrote:
> Various recent bioses support NVDIMMs or ADR using a non-standard
> e820 memory type, and Intel supplied reference Linux code using this
> type to various vendors.
>
> Wire this e820 table type up to export platform devices for the pmem
> driver so that we can use it in Linux, and also provide a memmap=
> argument to manually tag memory as protected, which can be used
> if the bios doesn't use the standard nonstandard interface, or
> we just want to test the pmem driver with regular memory.
>
> Based on an earlier patch from Dave Jiang <dave.jiang@xxxxxxxxx>
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
> ---
[..]
> +static __init int register_pmem_devices(void)
> +{
> + int i;
> +
> + for (i = 0; i < e820.nr_map; i++) {
> + struct e820entry *ei = &e820.map[i];
> +
> + if (ei->type == E820_PROTECTED_KERN) {
> + struct resource res = {
> + .flags = IORESOURCE_MEM,
> + .start = ei->addr,
> + .end = ei->addr + ei->size - 1,
> + };
> + register_pmem_device(&res);
> + }
> + }
> +
> + return 0;
> +}
Aside from the s/E820_PROTECTED_KERN/E820_PMEM/ suggestion this looks
ok to me. The "vaporware" new way can be a superset of this
mechanism.
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