[PATCH v2 01/29] virtio-mem: determine nid only once using memory_add_physaddr_to_nid()

David Hildenbrand
2020-11-12T13:38:41Z

Let's determine the target nid only once in case we have none specified -
usually, we'll end up with node 0 either way.

Reviewed-by: Wei Yang <richard.weiyang@linux.alibaba.com>
Reviewed-by: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Jason Wang <jasowang@redhat.com>
Cc: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
---
drivers/virtio/virtio_mem.c | 28 +++++++++++-----------------
1 file changed, 11 insertions(+), 17 deletions(-)

diff --git a/drivers/virtio/virtio_mem.c b/drivers/virtio/virtio_mem.c
index 181e2f18beae..a37fd73588da 100644
--- a/drivers/virtio/virtio_mem.c
+++ b/drivers/virtio/virtio_mem.c
@@ -70,7 +70,7 @@ struct virtio_mem {

/* The device block size (for communicating with the device). */
uint64_t device_block_size;
- /* The translated node id. NUMA_NO_NODE in case not specified. */
+ /* The determined node id for all memory of the device. */
int nid;
/* Physical start address of the memory region. */
uint64_t addr;
@@ -406,10 +406,6 @@ static int virtio_mem_sb_bitmap_prepare_next_mb(struct virtio_mem *vm)
static int virtio_mem_mb_add(struct virtio_mem *vm, unsigned long mb_id)
{
const uint64_t addr = virtio_mem_mb_id_to_phys(mb_id);
- int nid = vm->nid;
-
- if (nid == NUMA_NO_NODE)
- nid = memory_add_physaddr_to_nid(addr);

/*
* When force-unloading the driver and we still have memory added to
@@ -423,7 +419,8 @@ 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(),
+ return add_memory_driver_managed(vm->nid, addr,
+ memory_block_size_bytes(),
vm->resource_name,
MEMHP_MERGE_RESOURCE);
}
@@ -440,13 +437,9 @@ static int virtio_mem_mb_add(struct virtio_mem *vm, unsigned long mb_id)
static int virtio_mem_mb_remove(struct virtio_mem *vm, unsigned long mb_id)
{
const uint64_t addr = virtio_mem_mb_id_to_phys(mb_id);
- int nid = vm->nid;
-
- if (nid == NUMA_NO_NODE)
- nid = memory_add_physaddr_to_nid(addr);

dev_dbg(&vm->vdev->dev, "removing memory block: %lu\n", mb_id);
- return remove_memory(nid, addr, memory_block_size_bytes());
+ return remove_memory(vm->nid, addr, memory_block_size_bytes());
}

/*
@@ -461,14 +454,11 @@ static int virtio_mem_mb_offline_and_remove(struct virtio_mem *vm,
unsigned long mb_id)
{
const uint64_t addr = virtio_mem_mb_id_to_phys(mb_id);
- int nid = vm->nid;
-
- if (nid == NUMA_NO_NODE)
- nid = memory_add_physaddr_to_nid(addr);

dev_dbg(&vm->vdev->dev, "offlining and removing memory block: %lu\n",
mb_id);
- return offline_and_remove_memory(nid, addr, memory_block_size_bytes());
+ return offline_and_remove_memory(vm->nid, addr,
+ memory_block_size_bytes());
}

/*
@@ -1659,6 +1649,10 @@ static int virtio_mem_init(struct virtio_mem *vm)
virtio_cread_le(vm->vdev, struct virtio_mem_config, region_size,
&vm->region_size);

+ /* Determine the nid for the device based on the lowest address. */
+ if (vm->nid == NUMA_NO_NODE)
+ vm->nid = memory_add_physaddr_to_nid(vm->addr);
+
/*
* We always hotplug memory in memory block granularity. This way,
* we have to wait for exactly one memory block to online.
@@ -1707,7 +1701,7 @@ static int virtio_mem_init(struct virtio_mem *vm)
memory_block_size_bytes());
dev_info(&vm->vdev->dev, "subblock size: 0x%llx",
(unsigned long long)vm->subblock_size);
- if (vm->nid != NUMA_NO_NODE)
+ if (vm->nid != NUMA_NO_NODE && IS_ENABLED(CONFIG_NUMA))
dev_info(&vm->vdev->dev, "nid: %d", vm->nid);

return 0;
--
2.26.2