It walks resources registered with flags (IORESOURCE_DEVICE_BACKED_VMEMMAP | IORESOURCE_BUSY), usually used by device backed vmemmap region. currently, it only sticks to the persistent memory type since it is only one user.
CC: Andrew Morton <[email protected]> CC: Baoquan He <[email protected]> CC: Greg Kroah-Hartman <[email protected]> CC: Alison Schofield <[email protected]> CC: Dave Jiang <[email protected]> CC: Dan Williams <[email protected]> Signed-off-by: Li Zhijian <[email protected]> --- include/linux/ioport.h | 3 +++ kernel/resource.c | 13 +++++++++++++ 2 files changed, 16 insertions(+) diff --git a/include/linux/ioport.h b/include/linux/ioport.h index 3b59e924f531..10a60227d6c2 100644 --- a/include/linux/ioport.h +++ b/include/linux/ioport.h @@ -332,6 +332,9 @@ extern int walk_system_ram_res(u64 start, u64 end, void *arg, int (*func)(struct resource *, void *)); extern int +walk_device_backed_vmemmap_res(u64 start, u64 end, void *arg, + int (*func)(struct resource *, void *)); +extern int walk_system_ram_res_rev(u64 start, u64 end, void *arg, int (*func)(struct resource *, void *)); extern int diff --git a/kernel/resource.c b/kernel/resource.c index fcbca39dbc45..5f484266af07 100644 --- a/kernel/resource.c +++ b/kernel/resource.c @@ -431,6 +431,19 @@ int walk_system_ram_res(u64 start, u64 end, void *arg, func); } +/* + * This function calls the @func callback against all memory ranges, which + * are ranges marked as (IORESOURCE_DEVICE_BACKED_VMEMMAP | IORESOURCE_BUSY) + * and IORES_DESC_PERSISTENT_MEMORY. + */ +int walk_device_backed_vmemmap_res(u64 start, u64 end, void *arg, + int (*func)(struct resource *, void *)) +{ + return __walk_iomem_res_desc(start, end, + IORESOURCE_DEVICE_BACKED_VMEMMAP | IORESOURCE_BUSY, + IORES_DESC_PERSISTENT_MEMORY, arg, func); +} + /* * This function, being a variant of walk_system_ram_res(), calls the @func * callback against all memory ranges of type System RAM which are marked as -- 2.29.2
