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Date: Fri, 16 Oct 2020 16:49:53 +0800
From: Wei Yang <richard.weiyang@...ux.alibaba.com>
To: David Hildenbrand <david@...hat.com>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
virtualization@...ts.linux-foundation.org,
Andrew Morton <akpm@...ux-foundation.org>,
"Michael S . Tsirkin" <mst@...hat.com>,
Jason Wang <jasowang@...hat.com>,
Pankaj Gupta <pankaj.gupta.linux@...il.com>
Subject: Re: [PATCH v1 19/29] virito-mem: existing (un)plug functions are
specific to Sub Block Mode (SBM)
On Mon, Oct 12, 2020 at 02:53:13PM +0200, David Hildenbrand wrote:
>Let's rename them accordingly. virtio_mem_plug_request() and
>virtio_mem_unplug_request() will be handled separately.
>
>Cc: "Michael S. Tsirkin" <mst@...hat.com>
>Cc: Jason Wang <jasowang@...hat.com>
>Cc: Pankaj Gupta <pankaj.gupta.linux@...il.com>
>Signed-off-by: David Hildenbrand <david@...hat.com>
The code is correct, while the naming is a bit long to understand...
Reviewed-by: Wei Yang <richard.weiyang@...ux.alibaba.com>
>---
> drivers/virtio/virtio_mem.c | 90 ++++++++++++++++++-------------------
> 1 file changed, 43 insertions(+), 47 deletions(-)
>
>diff --git a/drivers/virtio/virtio_mem.c b/drivers/virtio/virtio_mem.c
>index 73ff6e9ba839..fc2b1ff3beed 100644
>--- a/drivers/virtio/virtio_mem.c
>+++ b/drivers/virtio/virtio_mem.c
>@@ -1075,8 +1075,8 @@ static int virtio_mem_send_unplug_all_request(struct virtio_mem *vm)
> * Plug selected subblocks. Updates the plugged state, but not the state
> * of the memory block.
> */
>-static int virtio_mem_mb_plug_sb(struct virtio_mem *vm, unsigned long mb_id,
>- int sb_id, int count)
>+static int virtio_mem_sbm_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;
>@@ -1096,8 +1096,8 @@ static int virtio_mem_mb_plug_sb(struct virtio_mem *vm, unsigned long mb_id,
> * Unplug selected subblocks. Updates the plugged state, but not the state
> * of the memory block.
> */
>-static int virtio_mem_mb_unplug_sb(struct virtio_mem *vm, unsigned long mb_id,
>- int sb_id, int count)
>+static int virtio_mem_sbm_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;
>@@ -1122,8 +1122,8 @@ static int virtio_mem_mb_unplug_sb(struct virtio_mem *vm, unsigned long mb_id,
> *
> * Note: can fail after some subblocks were unplugged.
> */
>-static int virtio_mem_mb_unplug_any_sb(struct virtio_mem *vm,
>- unsigned long mb_id, uint64_t *nb_sb)
>+static int virtio_mem_sbm_unplug_any_sb(struct virtio_mem *vm,
>+ unsigned long mb_id, uint64_t *nb_sb)
> {
> int sb_id, count;
> int rc;
>@@ -1144,7 +1144,7 @@ static int virtio_mem_mb_unplug_any_sb(struct virtio_mem *vm,
> sb_id--;
> }
>
>- rc = virtio_mem_mb_unplug_sb(vm, mb_id, sb_id, count);
>+ rc = virtio_mem_sbm_unplug_sb(vm, mb_id, sb_id, count);
> if (rc)
> return rc;
> *nb_sb -= count;
>@@ -1161,18 +1161,18 @@ static int virtio_mem_mb_unplug_any_sb(struct virtio_mem *vm,
> *
> * Note: can fail after some subblocks were unplugged.
> */
>-static int virtio_mem_mb_unplug(struct virtio_mem *vm, unsigned long mb_id)
>+static int virtio_mem_sbm_unplug_mb(struct virtio_mem *vm, unsigned long mb_id)
> {
> uint64_t nb_sb = vm->nb_sb_per_mb;
>
>- return virtio_mem_mb_unplug_any_sb(vm, mb_id, &nb_sb);
>+ return virtio_mem_sbm_unplug_any_sb(vm, mb_id, &nb_sb);
> }
>
> /*
> * Prepare tracking data for the next memory block.
> */
>-static int virtio_mem_prepare_next_mb(struct virtio_mem *vm,
>- unsigned long *mb_id)
>+static int virtio_mem_sbm_prepare_next_mb(struct virtio_mem *vm,
>+ unsigned long *mb_id)
> {
> int rc;
>
>@@ -1200,9 +1200,8 @@ static int virtio_mem_prepare_next_mb(struct virtio_mem *vm,
> *
> * Will modify the state of the memory block.
> */
>-static int virtio_mem_mb_plug_and_add(struct virtio_mem *vm,
>- unsigned long mb_id,
>- uint64_t *nb_sb)
>+static int virtio_mem_sbm_plug_and_add_mb(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);
> int rc;
>@@ -1214,7 +1213,7 @@ static int virtio_mem_mb_plug_and_add(struct virtio_mem *vm,
> * Plug the requested number of subblocks before adding it to linux,
> * so that onlining will directly online all plugged subblocks.
> */
>- rc = virtio_mem_mb_plug_sb(vm, mb_id, 0, count);
>+ rc = virtio_mem_sbm_plug_sb(vm, mb_id, 0, count);
> if (rc)
> return rc;
>
>@@ -1241,7 +1240,7 @@ static int virtio_mem_mb_plug_and_add(struct virtio_mem *vm,
> * TODO: Linux MM does not properly clean up yet in all cases
> * where adding of memory failed - especially on -ENOMEM.
> */
>- if (virtio_mem_mb_unplug_sb(vm, mb_id, 0, count))
>+ if (virtio_mem_sbm_unplug_sb(vm, mb_id, 0, count))
> new_state = VIRTIO_MEM_SBM_MB_PLUGGED;
> virtio_mem_sbm_set_mb_state(vm, mb_id, new_state);
> return rc;
>@@ -1259,8 +1258,9 @@ static int virtio_mem_mb_plug_and_add(struct virtio_mem *vm,
> *
> * Note: Can fail after some subblocks were successfully plugged.
> */
>-static int virtio_mem_mb_plug_any_sb(struct virtio_mem *vm, unsigned long mb_id,
>- uint64_t *nb_sb, bool online)
>+static int virtio_mem_sbm_plug_any_sb(struct virtio_mem *vm,
>+ unsigned long mb_id, uint64_t *nb_sb,
>+ bool online)
> {
> unsigned long pfn, nr_pages;
> int sb_id, count;
>@@ -1279,7 +1279,7 @@ static int virtio_mem_mb_plug_any_sb(struct virtio_mem *vm, unsigned long mb_id,
> !virtio_mem_sbm_test_sb_plugged(vm, mb_id, sb_id + count, 1))
> count++;
>
>- rc = virtio_mem_mb_plug_sb(vm, mb_id, sb_id, count);
>+ rc = virtio_mem_sbm_plug_sb(vm, mb_id, sb_id, count);
> if (rc)
> return rc;
> *nb_sb -= count;
>@@ -1323,7 +1323,7 @@ static int virtio_mem_plug_request(struct virtio_mem *vm, uint64_t diff)
> /* Try to plug subblocks of partially plugged online blocks. */
> virtio_mem_sbm_for_each_mb(vm, mb_id,
> VIRTIO_MEM_SBM_MB_ONLINE_PARTIAL) {
>- rc = virtio_mem_mb_plug_any_sb(vm, mb_id, &nb_sb, true);
>+ rc = virtio_mem_sbm_plug_any_sb(vm, mb_id, &nb_sb, true);
> if (rc || !nb_sb)
> goto out_unlock;
> cond_resched();
>@@ -1332,7 +1332,7 @@ static int virtio_mem_plug_request(struct virtio_mem *vm, uint64_t diff)
> /* Try to plug subblocks of partially plugged offline blocks. */
> virtio_mem_sbm_for_each_mb(vm, mb_id,
> VIRTIO_MEM_SBM_MB_OFFLINE_PARTIAL) {
>- rc = virtio_mem_mb_plug_any_sb(vm, mb_id, &nb_sb, false);
>+ rc = virtio_mem_sbm_plug_any_sb(vm, mb_id, &nb_sb, false);
> if (rc || !nb_sb)
> goto out_unlock;
> cond_resched();
>@@ -1349,7 +1349,7 @@ static int virtio_mem_plug_request(struct virtio_mem *vm, uint64_t diff)
> if (!virtio_mem_could_add_memory(vm, memory_block_size_bytes()))
> return -ENOSPC;
>
>- rc = virtio_mem_mb_plug_and_add(vm, mb_id, &nb_sb);
>+ rc = virtio_mem_sbm_plug_and_add_mb(vm, mb_id, &nb_sb);
> if (rc || !nb_sb)
> return rc;
> cond_resched();
>@@ -1360,10 +1360,10 @@ static int virtio_mem_plug_request(struct virtio_mem *vm, uint64_t diff)
> if (!virtio_mem_could_add_memory(vm, memory_block_size_bytes()))
> return -ENOSPC;
>
>- rc = virtio_mem_prepare_next_mb(vm, &mb_id);
>+ rc = virtio_mem_sbm_prepare_next_mb(vm, &mb_id);
> if (rc)
> return rc;
>- rc = virtio_mem_mb_plug_and_add(vm, mb_id, &nb_sb);
>+ rc = virtio_mem_sbm_plug_and_add_mb(vm, mb_id, &nb_sb);
> if (rc)
> return rc;
> cond_resched();
>@@ -1384,13 +1384,13 @@ static int virtio_mem_plug_request(struct virtio_mem *vm, uint64_t diff)
> *
> * Note: Can fail after some subblocks were successfully unplugged.
> */
>-static int virtio_mem_mb_unplug_any_sb_offline(struct virtio_mem *vm,
>- unsigned long mb_id,
>- uint64_t *nb_sb)
>+static int virtio_mem_sbm_unplug_any_sb_offline(struct virtio_mem *vm,
>+ unsigned long mb_id,
>+ uint64_t *nb_sb)
> {
> int rc;
>
>- rc = virtio_mem_mb_unplug_any_sb(vm, mb_id, nb_sb);
>+ rc = virtio_mem_sbm_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))
>@@ -1422,9 +1422,9 @@ static int virtio_mem_mb_unplug_any_sb_offline(struct virtio_mem *vm,
> *
> * Will modify the state of the memory block.
> */
>-static int virtio_mem_mb_unplug_sb_online(struct virtio_mem *vm,
>- unsigned long mb_id, int sb_id,
>- int count)
>+static int virtio_mem_sbm_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;
> unsigned long start_pfn;
>@@ -1438,7 +1438,7 @@ static int virtio_mem_mb_unplug_sb_online(struct virtio_mem *vm,
> return rc;
>
> /* Try to unplug the allocated memory */
>- rc = virtio_mem_mb_unplug_sb(vm, mb_id, sb_id, count);
>+ rc = virtio_mem_sbm_unplug_sb(vm, mb_id, sb_id, count);
> if (rc) {
> /* Return the memory to the buddy. */
> virtio_mem_fake_online(start_pfn, nr_pages);
>@@ -1460,17 +1460,17 @@ static int virtio_mem_mb_unplug_sb_online(struct virtio_mem *vm,
> * Note: Can fail after some subblocks were successfully unplugged. Can
> * return 0 even if subblocks were busy and could not get unplugged.
> */
>-static int virtio_mem_mb_unplug_any_sb_online(struct virtio_mem *vm,
>- unsigned long mb_id,
>- uint64_t *nb_sb)
>+static int virtio_mem_sbm_unplug_any_sb_online(struct virtio_mem *vm,
>+ unsigned long mb_id,
>+ uint64_t *nb_sb)
> {
> 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)) {
>- rc = virtio_mem_mb_unplug_sb_online(vm, mb_id, 0,
>- vm->nb_sb_per_mb);
>+ rc = virtio_mem_sbm_unplug_sb_online(vm, mb_id, 0,
>+ vm->nb_sb_per_mb);
> if (!rc) {
> *nb_sb -= vm->nb_sb_per_mb;
> goto unplugged;
>@@ -1487,7 +1487,7 @@ static int virtio_mem_mb_unplug_any_sb_online(struct virtio_mem *vm,
> if (sb_id < 0)
> break;
>
>- rc = virtio_mem_mb_unplug_sb_online(vm, mb_id, sb_id, 1);
>+ rc = virtio_mem_sbm_unplug_sb_online(vm, mb_id, sb_id, 1);
> if (rc == -EBUSY)
> continue;
> else if (rc)
>@@ -1535,8 +1535,7 @@ static int virtio_mem_unplug_request(struct virtio_mem *vm, uint64_t diff)
> /* Try to unplug subblocks of partially plugged offline blocks. */
> virtio_mem_sbm_for_each_mb_rev(vm, mb_id,
> VIRTIO_MEM_SBM_MB_OFFLINE_PARTIAL) {
>- rc = virtio_mem_mb_unplug_any_sb_offline(vm, mb_id,
>- &nb_sb);
>+ rc = virtio_mem_sbm_unplug_any_sb_offline(vm, mb_id, &nb_sb);
> if (rc || !nb_sb)
> goto out_unlock;
> cond_resched();
>@@ -1544,8 +1543,7 @@ static int virtio_mem_unplug_request(struct virtio_mem *vm, uint64_t diff)
>
> /* Try to unplug subblocks of plugged offline blocks. */
> virtio_mem_sbm_for_each_mb_rev(vm, mb_id, VIRTIO_MEM_SBM_MB_OFFLINE) {
>- rc = virtio_mem_mb_unplug_any_sb_offline(vm, mb_id,
>- &nb_sb);
>+ rc = virtio_mem_sbm_unplug_any_sb_offline(vm, mb_id, &nb_sb);
> if (rc || !nb_sb)
> goto out_unlock;
> cond_resched();
>@@ -1559,8 +1557,7 @@ static int virtio_mem_unplug_request(struct virtio_mem *vm, uint64_t diff)
> /* Try to unplug subblocks of partially plugged online blocks. */
> virtio_mem_sbm_for_each_mb_rev(vm, mb_id,
> VIRTIO_MEM_SBM_MB_ONLINE_PARTIAL) {
>- rc = virtio_mem_mb_unplug_any_sb_online(vm, mb_id,
>- &nb_sb);
>+ rc = virtio_mem_sbm_unplug_any_sb_online(vm, mb_id, &nb_sb);
> if (rc || !nb_sb)
> goto out_unlock;
> mutex_unlock(&vm->hotplug_mutex);
>@@ -1570,8 +1567,7 @@ static int virtio_mem_unplug_request(struct virtio_mem *vm, uint64_t diff)
>
> /* Try to unplug subblocks of plugged online blocks. */
> virtio_mem_sbm_for_each_mb_rev(vm, mb_id, VIRTIO_MEM_SBM_MB_ONLINE) {
>- rc = virtio_mem_mb_unplug_any_sb_online(vm, mb_id,
>- &nb_sb);
>+ rc = virtio_mem_sbm_unplug_any_sb_online(vm, mb_id, &nb_sb);
> if (rc || !nb_sb)
> goto out_unlock;
> mutex_unlock(&vm->hotplug_mutex);
>@@ -1596,7 +1592,7 @@ static int virtio_mem_unplug_pending_mb(struct virtio_mem *vm)
> int rc;
>
> virtio_mem_sbm_for_each_mb(vm, mb_id, VIRTIO_MEM_SBM_MB_PLUGGED) {
>- rc = virtio_mem_mb_unplug(vm, mb_id);
>+ rc = virtio_mem_sbm_unplug_mb(vm, mb_id);
> if (rc)
> return rc;
> virtio_mem_sbm_set_mb_state(vm, mb_id,
>--
>2.26.2
--
Wei Yang
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