> 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 >
