Re: [PATCH v3 3/7] mm/memory_hotplug: prepare passing flags to add_memory() and friends

From: Pankaj Gupta
Date: Thu Sep 10 2020 - 05:57:06 EST

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> We soon want to pass flags, e.g., to mark added System RAM resources.
> mergeable. Prepare for that.
>
> This patch is based on a similar patch by Oscar Salvador:
>
> https://lkml.kernel.org/r/20190625075227.15193-3-osalvador@xxxxxxx
>
> Acked-by: Wei Liu <wei.liu@xxxxxxxxxx>
> Reviewed-by: Juergen Gross <jgross@xxxxxxxx> # Xen related part
> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> Cc: Michal Hocko <mhocko@xxxxxxxx>
> Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
> Cc: Jason Gunthorpe <jgg@xxxxxxxx>
> Cc: Pankaj Gupta <pankaj.gupta.linux@xxxxxxxxx>
> Cc: Baoquan He <bhe@xxxxxxxxxx>
> Cc: Wei Yang <richardw.yang@xxxxxxxxxxxxxxx>
> Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
> Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
> Cc: Paul Mackerras <paulus@xxxxxxxxx>
> Cc: "Rafael J. Wysocki" <rjw@xxxxxxxxxxxxx>
> Cc: Len Brown <lenb@xxxxxxxxxx>
> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> Cc: Vishal Verma <vishal.l.verma@xxxxxxxxx>
> Cc: Dave Jiang <dave.jiang@xxxxxxxxx>
> Cc: "K. Y. Srinivasan" <kys@xxxxxxxxxxxxx>
> Cc: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>
> Cc: Stephen Hemminger <sthemmin@xxxxxxxxxxxxx>
> Cc: Wei Liu <wei.liu@xxxxxxxxxx>
> Cc: Heiko Carstens <hca@xxxxxxxxxxxxx>
> Cc: Vasily Gorbik <gor@xxxxxxxxxxxxx>
> Cc: Christian Borntraeger <borntraeger@xxxxxxxxxx>
> Cc: David Hildenbrand <david@xxxxxxxxxx>
> Cc: "Michael S. Tsirkin" <mst@xxxxxxxxxx>
> Cc: Jason Wang <jasowang@xxxxxxxxxx>
> Cc: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
> Cc: Juergen Gross <jgross@xxxxxxxx>
> Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>
> Cc: "Oliver O'Halloran" <oohall@xxxxxxxxx>
> Cc: Pingfan Liu <kernelfans@xxxxxxxxx>
> Cc: Nathan Lynch <nathanl@xxxxxxxxxxxxx>
> Cc: Libor Pechacek <lpechacek@xxxxxxx>
> Cc: Anton Blanchard <anton@xxxxxxxxxx>
> Cc: Leonardo Bras <leobras.c@xxxxxxxxx>
> Cc: linuxppc-dev@xxxxxxxxxxxxxxxx
> Cc: linux-acpi@xxxxxxxxxxxxxxx
> Cc: linux-nvdimm@xxxxxxxxxxxx
> Cc: linux-hyperv@xxxxxxxxxxxxxxx
> Cc: linux-s390@xxxxxxxxxxxxxxx
> Cc: virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx
> Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx
> Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
> ---
> arch/powerpc/platforms/powernv/memtrace.c | 2 +-
> arch/powerpc/platforms/pseries/hotplug-memory.c | 2 +-
> drivers/acpi/acpi_memhotplug.c | 3 ++-
> drivers/base/memory.c | 3 ++-
> drivers/dax/kmem.c | 2 +-
> drivers/hv/hv_balloon.c | 2 +-
> drivers/s390/char/sclp_cmd.c | 2 +-
> drivers/virtio/virtio_mem.c | 2 +-
> drivers/xen/balloon.c | 2 +-
> include/linux/memory_hotplug.h | 16 ++++++++++++----
> mm/memory_hotplug.c | 14 +++++++-------
> 11 files changed, 30 insertions(+), 20 deletions(-)
>
> diff --git a/arch/powerpc/platforms/powernv/memtrace.c b/arch/powerpc/platforms/powernv/memtrace.c
> index 13b369d2cc454..6828108486f83 100644
> --- a/arch/powerpc/platforms/powernv/memtrace.c
> +++ b/arch/powerpc/platforms/powernv/memtrace.c
> @@ -224,7 +224,7 @@ static int memtrace_online(void)
> ent->mem = 0;
> }
>
> - if (add_memory(ent->nid, ent->start, ent->size)) {
> + if (add_memory(ent->nid, ent->start, ent->size, MHP_NONE)) {
> pr_err("Failed to add trace memory to node %d\n",
> ent->nid);
> ret += 1;
> diff --git a/arch/powerpc/platforms/pseries/hotplug-memory.c b/arch/powerpc/platforms/pseries/hotplug-memory.c
> index 0ea976d1cac47..e1c9fa0d730f5 100644
> --- a/arch/powerpc/platforms/pseries/hotplug-memory.c
> +++ b/arch/powerpc/platforms/pseries/hotplug-memory.c
> @@ -615,7 +615,7 @@ static int dlpar_add_lmb(struct drmem_lmb *lmb)
> nid = memory_add_physaddr_to_nid(lmb->base_addr);
>
> /* Add the memory */
> - rc = __add_memory(nid, lmb->base_addr, block_sz);
> + rc = __add_memory(nid, lmb->base_addr, block_sz, MHP_NONE);
> if (rc) {
> invalidate_lmb_associativity_index(lmb);
> return rc;
> diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c
> index e294f44a78504..2067c3bc55763 100644
> --- a/drivers/acpi/acpi_memhotplug.c
> +++ b/drivers/acpi/acpi_memhotplug.c
> @@ -207,7 +207,8 @@ static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
> if (node < 0)
> node = memory_add_physaddr_to_nid(info->start_addr);
>
> - result = __add_memory(node, info->start_addr, info->length);
> + result = __add_memory(node, info->start_addr, info->length,
> + MHP_NONE);
>
> /*
> * If the memory block has been used by the kernel, add_memory()
> diff --git a/drivers/base/memory.c b/drivers/base/memory.c
> index 4db3c660de831..b4c297dd04755 100644
> --- a/drivers/base/memory.c
> +++ b/drivers/base/memory.c
> @@ -432,7 +432,8 @@ static ssize_t probe_store(struct device *dev, struct device_attribute *attr,
>
> nid = memory_add_physaddr_to_nid(phys_addr);
> ret = __add_memory(nid, phys_addr,
> - MIN_MEMORY_BLOCK_SIZE * sections_per_block);
> + MIN_MEMORY_BLOCK_SIZE * sections_per_block,
> + MHP_NONE);
>
> if (ret)
> goto out;
> diff --git a/drivers/dax/kmem.c b/drivers/dax/kmem.c
> index 7dcb2902e9b1b..896cb9444e727 100644
> --- a/drivers/dax/kmem.c
> +++ b/drivers/dax/kmem.c
> @@ -95,7 +95,7 @@ int dev_dax_kmem_probe(struct dev_dax *dev_dax)
> * this as RAM automatically.
> */
> rc = add_memory_driver_managed(numa_node, range.start,
> - range_len(&range), kmem_name);
> + range_len(&range), kmem_name, MHP_NONE);
>
> res->flags |= IORESOURCE_BUSY;
> if (rc) {
> diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c
> index 32e3bc0aa665a..3c0d52e244520 100644
> --- a/drivers/hv/hv_balloon.c
> +++ b/drivers/hv/hv_balloon.c
> @@ -726,7 +726,7 @@ static void hv_mem_hot_add(unsigned long start, unsigned long size,
>
> nid = memory_add_physaddr_to_nid(PFN_PHYS(start_pfn));
> ret = add_memory(nid, PFN_PHYS((start_pfn)),
> - (HA_CHUNK << PAGE_SHIFT));
> + (HA_CHUNK << PAGE_SHIFT), MHP_NONE);
>
> if (ret) {
> pr_err("hot_add memory failed error is %d\n", ret);
> diff --git a/drivers/s390/char/sclp_cmd.c b/drivers/s390/char/sclp_cmd.c
> index a864b21af602a..f6e97f0830f64 100644
> --- a/drivers/s390/char/sclp_cmd.c
> +++ b/drivers/s390/char/sclp_cmd.c
> @@ -406,7 +406,7 @@ static void __init add_memory_merged(u16 rn)
> if (!size)
> goto skip_add;
> for (addr = start; addr < start + size; addr += block_size)
> - add_memory(0, addr, block_size);
> + add_memory(0, addr, block_size, MHP_NONE);
> skip_add:
> first_rn = rn;
> num = 1;
> diff --git a/drivers/virtio/virtio_mem.c b/drivers/virtio/virtio_mem.c
> index 834b7c13ef3dc..ed99e43354010 100644
> --- a/drivers/virtio/virtio_mem.c
> +++ b/drivers/virtio/virtio_mem.c
> @@ -424,7 +424,7 @@ static int virtio_mem_mb_add(struct virtio_mem *vm, unsigned long mb_id)
>
> dev_dbg(&vm->vdev->dev, "adding memory block: %lu\n", mb_id);
> return add_memory_driver_managed(nid, addr, memory_block_size_bytes(),
> - vm->resource_name);
> + vm->resource_name, MHP_NONE);
> }
>
> /*
> diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
> index 51427c752b37b..9f40a294d398d 100644
> --- a/drivers/xen/balloon.c
> +++ b/drivers/xen/balloon.c
> @@ -331,7 +331,7 @@ static enum bp_state reserve_additional_memory(void)
> mutex_unlock(&balloon_mutex);
> /* add_memory_resource() requires the device_hotplug lock */
> lock_device_hotplug();
> - rc = add_memory_resource(nid, resource);
> + rc = add_memory_resource(nid, resource, MHP_NONE);
> unlock_device_hotplug();
> mutex_lock(&balloon_mutex);
>
> diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
> index 51a877fec8da8..e53d1058f3443 100644
> --- a/include/linux/memory_hotplug.h
> +++ b/include/linux/memory_hotplug.h
> @@ -57,6 +57,12 @@ enum {
> MMOP_ONLINE_MOVABLE,
> };
>
> +/* Flags for add_memory() and friends to specify memory hotplug details. */
> +typedef int __bitwise mhp_t;
> +
> +/* No special request */
> +#define MHP_NONE ((__force mhp_t)0)
> +
> /*
> * Extended parameters for memory hotplug:
> * altmap: alternative allocator for memmap array (optional)
> @@ -345,11 +351,13 @@ extern void set_zone_contiguous(struct zone *zone);
> extern void clear_zone_contiguous(struct zone *zone);
>
> extern void __ref free_area_init_core_hotplug(int nid);
> -extern int __add_memory(int nid, u64 start, u64 size);
> -extern int add_memory(int nid, u64 start, u64 size);
> -extern int add_memory_resource(int nid, struct resource *resource);
> +extern int __add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags);
> +extern int add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags);
> +extern int add_memory_resource(int nid, struct resource *resource,
> + mhp_t mhp_flags);
> extern int add_memory_driver_managed(int nid, u64 start, u64 size,
> - const char *resource_name);
> + const char *resource_name,
> + mhp_t mhp_flags);
> extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
> unsigned long nr_pages,
> struct vmem_altmap *altmap, int migratetype);
> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> index 8e1cd18b5cf14..8f0bd7c9a63a5 100644
> --- a/mm/memory_hotplug.c
> +++ b/mm/memory_hotplug.c
> @@ -1039,7 +1039,7 @@ static int online_memory_block(struct memory_block *mem, void *arg)
> *
> * we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG
> */
> -int __ref add_memory_resource(int nid, struct resource *res)
> +int __ref add_memory_resource(int nid, struct resource *res, mhp_t mhp_flags)
> {
> struct mhp_params params = { .pgprot = PAGE_KERNEL };
> u64 start, size;
> @@ -1118,7 +1118,7 @@ int __ref add_memory_resource(int nid, struct resource *res)
> }
>
> /* requires device_hotplug_lock, see add_memory_resource() */
> -int __ref __add_memory(int nid, u64 start, u64 size)
> +int __ref __add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags)
> {
> struct resource *res;
> int ret;
> @@ -1127,18 +1127,18 @@ int __ref __add_memory(int nid, u64 start, u64 size)
> if (IS_ERR(res))
> return PTR_ERR(res);
>
> - ret = add_memory_resource(nid, res);
> + ret = add_memory_resource(nid, res, mhp_flags);
> if (ret < 0)
> release_memory_resource(res);
> return ret;
> }
>
> -int add_memory(int nid, u64 start, u64 size)
> +int add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags)
> {
> int rc;
>
> lock_device_hotplug();
> - rc = __add_memory(nid, start, size);
> + rc = __add_memory(nid, start, size, mhp_flags);
> unlock_device_hotplug();
>
> return rc;
> @@ -1167,7 +1167,7 @@ EXPORT_SYMBOL_GPL(add_memory);
> * "System RAM ($DRIVER)".
> */
> int add_memory_driver_managed(int nid, u64 start, u64 size,
> - const char *resource_name)
> + const char *resource_name, mhp_t mhp_flags)
> {
> struct resource *res;
> int rc;
> @@ -1185,7 +1185,7 @@ int add_memory_driver_managed(int nid, u64 start, u64 size,
> goto out_unlock;
> }
>
> - rc = add_memory_resource(nid, res);
> + rc = add_memory_resource(nid, res, mhp_flags);
> if (rc < 0)
> release_memory_resource(res);
>
> --

Reviewed-by: Pankaj Gupta <pankaj.gupta.linux@xxxxxxxxx>

> 2.26.2
>

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