[PATCH v2 20/29] virtio-mem: nb_sb_per_mb and subblock_size are specific to Sub Block Mode (SBM)

David Hildenbrand
2020-11-12T13:39:40Z

Let's rename to "sbs_per_mb" and "sb_size" and move accordingly.

Reviewed-by: Wei Yang <richard.weiyang@linux.alibaba.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 | 96 ++++++++++++++++++-------------------
1 file changed, 48 insertions(+), 48 deletions(-)

diff --git a/drivers/virtio/virtio_mem.c b/drivers/virtio/virtio_mem.c
index 851cddf5c606..6395c3090252 100644
--- a/drivers/virtio/virtio_mem.c
+++ b/drivers/virtio/virtio_mem.c
@@ -96,11 +96,6 @@ struct virtio_mem {
/* Maximum region size in bytes. */
uint64_t region_size;

- /* The subblock size. */
- uint64_t subblock_size;
- /* The number of subblocks per memory block. */
- uint32_t nb_sb_per_mb;
-
/* Id of the first memory block of this device. */
unsigned long first_mb_id;
/* Id of the last usable memory block of this device. */
@@ -126,6 +121,11 @@ struct virtio_mem {
uint64_t offline_threshold;

struct {
+ /* The subblock size. */
+ uint64_t sb_size;
+ /* The number of subblocks per Linux memory block. */
+ uint32_t sbs_per_mb;
+
/* Summary of all memory block states. */
unsigned long mb_count[VIRTIO_MEM_SBM_MB_COUNT];

@@ -256,7 +256,7 @@ static unsigned long virtio_mem_phys_to_sb_id(struct virtio_mem *vm,
const unsigned long mb_id = virtio_mem_phys_to_mb_id(addr);
const unsigned long mb_addr = virtio_mem_mb_id_to_phys(mb_id);

- return (addr - mb_addr) / vm->subblock_size;
+ return (addr - mb_addr) / vm->sbm.sb_size;
}

/*
@@ -332,7 +332,7 @@ static int virtio_mem_sbm_mb_states_prepare_next_mb(struct virtio_mem *vm)
static int virtio_mem_sbm_sb_state_bit_nr(struct virtio_mem *vm,
unsigned long mb_id, int sb_id)
{
- return (mb_id - vm->first_mb_id) * vm->nb_sb_per_mb + sb_id;
+ return (mb_id - vm->first_mb_id) * vm->sbm.sbs_per_mb + sb_id;
}

/*
@@ -395,7 +395,7 @@ static bool virtio_mem_sbm_test_sb_unplugged(struct virtio_mem *vm,
}

/*
- * Find the first unplugged subblock. Returns vm->nb_sb_per_mb in case there is
+ * Find the first unplugged subblock. Returns vm->sbm.sbs_per_mb in case there is
* none.
*/
static int virtio_mem_sbm_first_unplugged_sb(struct virtio_mem *vm,
@@ -404,7 +404,7 @@ static int virtio_mem_sbm_first_unplugged_sb(struct virtio_mem *vm,
const int bit = virtio_mem_sbm_sb_state_bit_nr(vm, mb_id, 0);

return find_next_zero_bit(vm->sbm.sb_states,
- bit + vm->nb_sb_per_mb, bit) - bit;
+ bit + vm->sbm.sbs_per_mb, bit) - bit;
}

/*
@@ -413,8 +413,8 @@ static int virtio_mem_sbm_first_unplugged_sb(struct virtio_mem *vm,
static int virtio_mem_sbm_sb_states_prepare_next_mb(struct virtio_mem *vm)
{
const unsigned long old_nb_mb = vm->next_mb_id - vm->first_mb_id;
- const unsigned long old_nb_bits = old_nb_mb * vm->nb_sb_per_mb;
- const unsigned long new_nb_bits = (old_nb_mb + 1) * vm->nb_sb_per_mb;
+ const unsigned long old_nb_bits = old_nb_mb * vm->sbm.sbs_per_mb;
+ const unsigned long new_nb_bits = (old_nb_mb + 1) * vm->sbm.sbs_per_mb;
int old_pages = PFN_UP(BITS_TO_LONGS(old_nb_bits) * sizeof(long));
int new_pages = PFN_UP(BITS_TO_LONGS(new_nb_bits) * sizeof(long));
unsigned long *new_bitmap, *old_bitmap;
@@ -640,15 +640,15 @@ static void virtio_mem_notify_online(struct virtio_mem *vm, unsigned long mb_id)
static void virtio_mem_notify_going_offline(struct virtio_mem *vm,
unsigned long mb_id)
{
- const unsigned long nr_pages = PFN_DOWN(vm->subblock_size);
+ const unsigned long nr_pages = PFN_DOWN(vm->sbm.sb_size);
unsigned long pfn;
int sb_id;

- for (sb_id = 0; sb_id < vm->nb_sb_per_mb; sb_id++) {
+ for (sb_id = 0; sb_id < vm->sbm.sbs_per_mb; sb_id++) {
if (virtio_mem_sbm_test_sb_plugged(vm, mb_id, sb_id, 1))
continue;
pfn = PFN_DOWN(virtio_mem_mb_id_to_phys(mb_id) +
- sb_id * vm->subblock_size);
+ sb_id * vm->sbm.sb_size);
virtio_mem_fake_offline_going_offline(pfn, nr_pages);
}
}
@@ -656,15 +656,15 @@ static void virtio_mem_notify_going_offline(struct virtio_mem *vm,
static void virtio_mem_notify_cancel_offline(struct virtio_mem *vm,
unsigned long mb_id)
{
- const unsigned long nr_pages = PFN_DOWN(vm->subblock_size);
+ const unsigned long nr_pages = PFN_DOWN(vm->sbm.sb_size);
unsigned long pfn;
int sb_id;

- for (sb_id = 0; sb_id < vm->nb_sb_per_mb; sb_id++) {
+ for (sb_id = 0; sb_id < vm->sbm.sbs_per_mb; sb_id++) {
if (virtio_mem_sbm_test_sb_plugged(vm, mb_id, sb_id, 1))
continue;
pfn = PFN_DOWN(virtio_mem_mb_id_to_phys(mb_id) +
- sb_id * vm->subblock_size);
+ sb_id * vm->sbm.sb_size);
virtio_mem_fake_offline_cancel_offline(pfn, nr_pages);
}
}
@@ -1103,8 +1103,8 @@ static int virtio_mem_mb_plug_sb(struct virtio_mem *vm, unsigned long mb_id,
int sb_id, int count)
{
const uint64_t addr = virtio_mem_mb_id_to_phys(mb_id) +
- sb_id * vm->subblock_size;
- const uint64_t size = count * vm->subblock_size;
+ sb_id * vm->sbm.sb_size;
+ const uint64_t size = count * vm->sbm.sb_size;
int rc;

rc = virtio_mem_send_plug_request(vm, addr, size);
@@ -1121,8 +1121,8 @@ static int virtio_mem_mb_unplug_sb(struct virtio_mem *vm, unsigned long mb_id,
int sb_id, int count)
{
const uint64_t addr = virtio_mem_mb_id_to_phys(mb_id) +
- sb_id * vm->subblock_size;
- const uint64_t size = count * vm->subblock_size;
+ sb_id * vm->sbm.sb_size;
+ const uint64_t size = count * vm->sbm.sb_size;
int rc;

rc = virtio_mem_send_unplug_request(vm, addr, size);
@@ -1146,7 +1146,7 @@ static int virtio_mem_mb_unplug_any_sb(struct virtio_mem *vm,
int sb_id, count;
int rc;

- sb_id = vm->nb_sb_per_mb - 1;
+ sb_id = vm->sbm.sbs_per_mb - 1;
while (*nb_sb) {
/* Find the next candidate subblock */
while (sb_id >= 0 &&
@@ -1181,7 +1181,7 @@ static int virtio_mem_mb_unplug_any_sb(struct virtio_mem *vm,
*/
static int virtio_mem_mb_unplug(struct virtio_mem *vm, unsigned long mb_id)
{
- uint64_t nb_sb = vm->nb_sb_per_mb;
+ uint64_t nb_sb = vm->sbm.sbs_per_mb;

return virtio_mem_mb_unplug_any_sb(vm, mb_id, &nb_sb);
}
@@ -1222,7 +1222,7 @@ static int virtio_mem_mb_plug_and_add(struct virtio_mem *vm,
unsigned long mb_id,
uint64_t *nb_sb)
{
- const int count = min_t(int, *nb_sb, vm->nb_sb_per_mb);
+ const int count = min_t(int, *nb_sb, vm->sbm.sbs_per_mb);
int rc;

if (WARN_ON_ONCE(!count))
@@ -1240,7 +1240,7 @@ static int virtio_mem_mb_plug_and_add(struct virtio_mem *vm,
* Mark the block properly offline before adding it to Linux,
* so the memory notifiers will find the block in the right state.
*/
- if (count == vm->nb_sb_per_mb)
+ if (count == vm->sbm.sbs_per_mb)
virtio_mem_sbm_set_mb_state(vm, mb_id,
VIRTIO_MEM_SBM_MB_OFFLINE);
else
@@ -1289,11 +1289,11 @@ static int virtio_mem_mb_plug_any_sb(struct virtio_mem *vm, unsigned long mb_id,

while (*nb_sb) {
sb_id = virtio_mem_sbm_first_unplugged_sb(vm, mb_id);
- if (sb_id >= vm->nb_sb_per_mb)
+ if (sb_id >= vm->sbm.sbs_per_mb)
break;
count = 1;
while (count < *nb_sb &&
- sb_id + count < vm->nb_sb_per_mb &&
+ sb_id + count < vm->sbm.sbs_per_mb &&
!virtio_mem_sbm_test_sb_plugged(vm, mb_id, sb_id + count, 1))
count++;

@@ -1306,12 +1306,12 @@ static int virtio_mem_mb_plug_any_sb(struct virtio_mem *vm, unsigned long mb_id,

/* fake-online the pages if the memory block is online */
pfn = PFN_DOWN(virtio_mem_mb_id_to_phys(mb_id) +
- sb_id * vm->subblock_size);
- nr_pages = PFN_DOWN(count * vm->subblock_size);
+ sb_id * vm->sbm.sb_size);
+ nr_pages = PFN_DOWN(count * vm->sbm.sb_size);
virtio_mem_fake_online(pfn, nr_pages);
}

- if (virtio_mem_sbm_test_sb_plugged(vm, mb_id, 0, vm->nb_sb_per_mb)) {
+ if (virtio_mem_sbm_test_sb_plugged(vm, mb_id, 0, vm->sbm.sbs_per_mb)) {
if (online)
virtio_mem_sbm_set_mb_state(vm, mb_id,
VIRTIO_MEM_SBM_MB_ONLINE);
@@ -1328,7 +1328,7 @@ static int virtio_mem_mb_plug_any_sb(struct virtio_mem *vm, unsigned long mb_id,
*/
static int virtio_mem_plug_request(struct virtio_mem *vm, uint64_t diff)
{
- uint64_t nb_sb = diff / vm->subblock_size;
+ uint64_t nb_sb = diff / vm->sbm.sb_size;
unsigned long mb_id;
int rc;

@@ -1411,13 +1411,13 @@ static int virtio_mem_mb_unplug_any_sb_offline(struct virtio_mem *vm,
rc = virtio_mem_mb_unplug_any_sb(vm, mb_id, nb_sb);

/* some subblocks might have been unplugged even on failure */
- if (!virtio_mem_sbm_test_sb_plugged(vm, mb_id, 0, vm->nb_sb_per_mb))
+ if (!virtio_mem_sbm_test_sb_plugged(vm, mb_id, 0, vm->sbm.sbs_per_mb))
virtio_mem_sbm_set_mb_state(vm, mb_id,
VIRTIO_MEM_SBM_MB_OFFLINE_PARTIAL);
if (rc)
return rc;

- if (virtio_mem_sbm_test_sb_unplugged(vm, mb_id, 0, vm->nb_sb_per_mb)) {
+ if (virtio_mem_sbm_test_sb_unplugged(vm, mb_id, 0, vm->sbm.sbs_per_mb)) {
/*
* Remove the block from Linux - this should never fail.
* Hinder the block from getting onlined by marking it
@@ -1444,12 +1444,12 @@ static int virtio_mem_mb_unplug_sb_online(struct virtio_mem *vm,
unsigned long mb_id, int sb_id,
int count)
{
- const unsigned long nr_pages = PFN_DOWN(vm->subblock_size) * count;
+ const unsigned long nr_pages = PFN_DOWN(vm->sbm.sb_size) * count;
unsigned long start_pfn;
int rc;

start_pfn = PFN_DOWN(virtio_mem_mb_id_to_phys(mb_id) +
- sb_id * vm->subblock_size);
+ sb_id * vm->sbm.sb_size);

rc = virtio_mem_fake_offline(start_pfn, nr_pages);
if (rc)
@@ -1485,19 +1485,19 @@ static int virtio_mem_mb_unplug_any_sb_online(struct virtio_mem *vm,
int rc, sb_id;

/* If possible, try to unplug the complete block in one shot. */
- if (*nb_sb >= vm->nb_sb_per_mb &&
- virtio_mem_sbm_test_sb_plugged(vm, mb_id, 0, vm->nb_sb_per_mb)) {
+ if (*nb_sb >= vm->sbm.sbs_per_mb &&
+ virtio_mem_sbm_test_sb_plugged(vm, mb_id, 0, vm->sbm.sbs_per_mb)) {
rc = virtio_mem_mb_unplug_sb_online(vm, mb_id, 0,
- vm->nb_sb_per_mb);
+ vm->sbm.sbs_per_mb);
if (!rc) {
- *nb_sb -= vm->nb_sb_per_mb;
+ *nb_sb -= vm->sbm.sbs_per_mb;
goto unplugged;
} else if (rc != -EBUSY)
return rc;
}

/* Fallback to single subblocks. */
- for (sb_id = vm->nb_sb_per_mb - 1; sb_id >= 0 && *nb_sb; sb_id--) {
+ for (sb_id = vm->sbm.sbs_per_mb - 1; sb_id >= 0 && *nb_sb; sb_id--) {
/* Find the next candidate subblock */
while (sb_id >= 0 &&
!virtio_mem_sbm_test_sb_plugged(vm, mb_id, sb_id, 1))
@@ -1519,7 +1519,7 @@ static int virtio_mem_mb_unplug_any_sb_online(struct virtio_mem *vm,
* remove it. This will usually not fail, as no memory is in use
* anymore - however some other notifiers might NACK the request.
*/
- if (virtio_mem_sbm_test_sb_unplugged(vm, mb_id, 0, vm->nb_sb_per_mb)) {
+ if (virtio_mem_sbm_test_sb_unplugged(vm, mb_id, 0, vm->sbm.sbs_per_mb)) {
mutex_unlock(&vm->hotplug_mutex);
rc = virtio_mem_mb_offline_and_remove(vm, mb_id);
mutex_lock(&vm->hotplug_mutex);
@@ -1536,7 +1536,7 @@ static int virtio_mem_mb_unplug_any_sb_online(struct virtio_mem *vm,
*/
static int virtio_mem_unplug_request(struct virtio_mem *vm, uint64_t diff)
{
- uint64_t nb_sb = diff / vm->subblock_size;
+ uint64_t nb_sb = diff / vm->sbm.sb_size;
unsigned long mb_id;
int rc;

@@ -1827,11 +1827,11 @@ static int virtio_mem_init(struct virtio_mem *vm)
* - Is required for now for alloc_contig_range() to work reliably -
* it doesn't properly handle smaller granularity on ZONE_NORMAL.
*/
- vm->subblock_size = max_t(uint64_t, MAX_ORDER_NR_PAGES,
- pageblock_nr_pages) * PAGE_SIZE;
- vm->subblock_size = max_t(uint64_t, vm->device_block_size,
- vm->subblock_size);
- vm->nb_sb_per_mb = memory_block_size_bytes() / vm->subblock_size;
+ vm->sbm.sb_size = max_t(uint64_t, MAX_ORDER_NR_PAGES,
+ pageblock_nr_pages) * PAGE_SIZE;
+ vm->sbm.sb_size = max_t(uint64_t, vm->device_block_size,
+ vm->sbm.sb_size);
+ vm->sbm.sbs_per_mb = memory_block_size_bytes() / vm->sbm.sb_size;

/* Round up to the next full memory block */
vm->first_mb_id = virtio_mem_phys_to_mb_id(vm->addr - 1 +
@@ -1849,7 +1849,7 @@ static int virtio_mem_init(struct virtio_mem *vm)
dev_info(&vm->vdev->dev, "memory block size: 0x%lx",
memory_block_size_bytes());
dev_info(&vm->vdev->dev, "subblock size: 0x%llx",
- (unsigned long long)vm->subblock_size);
+ (unsigned long long)vm->sbm.sb_size);
if (vm->nid != NUMA_NO_NODE && IS_ENABLED(CONFIG_NUMA))
dev_info(&vm->vdev->dev, "nid: %d", vm->nid);

--
2.26.2