Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
From:   David Hildenbrand <david@redhat.com>
To:     linux-kernel@vger.kernel.org
Cc:     linux-mm@kvack.org, virtualization@lists.linux-foundation.org,
        Andrew Morton <akpm@linux-foundation.org>,
        "Michael S . Tsirkin" <mst@redhat.com>,
        David Hildenbrand <david@redhat.com>,
        Jason Wang <jasowang@redhat.com>,
        Pankaj Gupta <pankaj.gupta.linux@gmail.com>
Subject: [PATCH v1 20/29] virtio-mem: nb_sb_per_mb and subblock_size are specific to Sub Block Mode (SBM)
Date:   Mon, 12 Oct 2020 14:53:14 +0200
Message-Id: <20201012125323.17509-21-david@redhat.com>
In-Reply-To: <20201012125323.17509-1-david@redhat.com>
References: <20201012125323.17509-1-david@redhat.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

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

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 fc2b1ff3beed..3a772714fec9 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;
 }
 
 /*
@@ -334,7 +334,7 @@ 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;
 }
 
 /*
@@ -397,7 +397,7 @@ 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,
@@ -406,7 +406,7 @@ 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;
 }
 
 /*
@@ -415,8 +415,8 @@ 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;
@@ -642,15 +642,15 @@ 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);
 	}
 }
@@ -658,15 +658,15 @@ 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);
 	}
 }
@@ -1079,8 +1079,8 @@ 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;
-	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;
 
 	dev_dbg(&vm->vdev->dev, "plugging memory block: %lu : %i - %i\n", mb_id,
@@ -1100,8 +1100,8 @@ 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;
-	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;
 
 	dev_dbg(&vm->vdev->dev, "unplugging memory block: %lu : %i - %i\n",
@@ -1128,7 +1128,7 @@ static int virtio_mem_sbm_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 &&
@@ -1163,7 +1163,7 @@ static int virtio_mem_sbm_unplug_any_sb(struct virtio_mem *vm,
  */
 static int virtio_mem_sbm_unplug_mb(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_sbm_unplug_any_sb(vm, mb_id, &nb_sb);
 }
@@ -1203,7 +1203,7 @@ static int virtio_mem_sbm_prepare_next_mb(struct virtio_mem *vm,
 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);
+	const int count = min_t(int, *nb_sb, vm->sbm.sbs_per_mb);
 	int rc;
 
 	if (WARN_ON_ONCE(!count))
@@ -1221,7 +1221,7 @@ static int virtio_mem_sbm_plug_and_add_mb(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
@@ -1271,11 +1271,11 @@ static int virtio_mem_sbm_plug_any_sb(struct virtio_mem *vm,
 
 	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++;
 
@@ -1288,12 +1288,12 @@ static int virtio_mem_sbm_plug_any_sb(struct virtio_mem *vm,
 
 		/* 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);
@@ -1310,7 +1310,7 @@ static int virtio_mem_sbm_plug_any_sb(struct virtio_mem *vm,
  */
 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;
 
@@ -1393,13 +1393,13 @@ static int virtio_mem_sbm_unplug_any_sb_offline(struct virtio_mem *vm,
 	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))
+	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
@@ -1426,12 +1426,12 @@ 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;
+	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)
@@ -1467,19 +1467,19 @@ static int virtio_mem_sbm_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_sbm_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))
@@ -1501,7 +1501,7 @@ static int virtio_mem_sbm_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);
@@ -1518,7 +1518,7 @@ static int virtio_mem_sbm_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;
 
@@ -1805,11 +1805,11 @@ 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 +
@@ -1827,7 +1827,7 @@ 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