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author | 2020-11-12 14:38:05 +0100 | |
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committer | 2020-12-18 16:14:27 -0500 | |
commit | 54c6a6ba75ba4c428b659b167f87c07100ba260e (patch) | |
tree | 01993059e4bc012264e3479b4a8aead0a7c539d2 /drivers/virtio | |
parent | virtio-mem: memory block states are specific to Sub Block Mode (SBM) (diff) | |
download | linux-54c6a6ba75ba4c428b659b167f87c07100ba260e.tar.gz linux-54c6a6ba75ba4c428b659b167f87c07100ba260e.tar.bz2 linux-54c6a6ba75ba4c428b659b167f87c07100ba260e.zip |
virito-mem: subblock states are specific to Sub Block Mode (SBM)
Let's rename and move accordingly. While at it, rename sb_bitmap to
"sb_states".
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>
Link: https://lore.kernel.org/r/20201112133815.13332-20-david@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/virtio')
-rw-r--r-- | drivers/virtio/virtio_mem.c | 132 |
1 files changed, 69 insertions, 63 deletions
diff --git a/drivers/virtio/virtio_mem.c b/drivers/virtio/virtio_mem.c index c6cc301c78e1..851cddf5c606 100644 --- a/drivers/virtio/virtio_mem.c +++ b/drivers/virtio/virtio_mem.c @@ -137,17 +137,23 @@ struct virtio_mem { * memory in one 4 KiB page. */ uint8_t *mb_states; - } sbm; - /* - * $nb_sb_per_mb bit per memory block. Handled similar to sbm.mb_states. - * - * With 4MB subblocks, we manage 128GB of memory in one page. - */ - unsigned long *sb_bitmap; + /* + * Bitmap: one bit per subblock. Allocated similar to + * sbm.mb_states. + * + * A set bit means the corresponding subblock is plugged, + * otherwise it's unblocked. + * + * With 4 MiB subblocks, we manage 128 GiB of memory in one + * 4 KiB page. + */ + unsigned long *sb_states; + } sbm; /* - * Mutex that protects the sbm.mb_count, sbm.mb_states, and sb_bitmap. + * Mutex that protects the sbm.mb_count, sbm.mb_states, and + * sbm.sb_states. * * When this lock is held the pointers can't change, ONLINE and * OFFLINE blocks can't change the state and no subblocks will get @@ -323,8 +329,8 @@ static int virtio_mem_sbm_mb_states_prepare_next_mb(struct virtio_mem *vm) * Calculate the bit number in the subblock bitmap for the given subblock * inside the given memory block. */ -static int virtio_mem_sb_bitmap_bit_nr(struct virtio_mem *vm, - unsigned long mb_id, int sb_id) +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; } @@ -334,13 +340,13 @@ static int virtio_mem_sb_bitmap_bit_nr(struct virtio_mem *vm, * * Will not modify the state of the memory block. */ -static void virtio_mem_mb_set_sb_plugged(struct virtio_mem *vm, - unsigned long mb_id, int sb_id, - int count) +static void virtio_mem_sbm_set_sb_plugged(struct virtio_mem *vm, + unsigned long mb_id, int sb_id, + int count) { - const int bit = virtio_mem_sb_bitmap_bit_nr(vm, mb_id, sb_id); + const int bit = virtio_mem_sbm_sb_state_bit_nr(vm, mb_id, sb_id); - __bitmap_set(vm->sb_bitmap, bit, count); + __bitmap_set(vm->sbm.sb_states, bit, count); } /* @@ -348,86 +354,87 @@ static void virtio_mem_mb_set_sb_plugged(struct virtio_mem *vm, * * Will not modify the state of the memory block. */ -static void virtio_mem_mb_set_sb_unplugged(struct virtio_mem *vm, - unsigned long mb_id, int sb_id, - int count) +static void virtio_mem_sbm_set_sb_unplugged(struct virtio_mem *vm, + unsigned long mb_id, int sb_id, + int count) { - const int bit = virtio_mem_sb_bitmap_bit_nr(vm, mb_id, sb_id); + const int bit = virtio_mem_sbm_sb_state_bit_nr(vm, mb_id, sb_id); - __bitmap_clear(vm->sb_bitmap, bit, count); + __bitmap_clear(vm->sbm.sb_states, bit, count); } /* * Test if all selected subblocks are plugged. */ -static bool virtio_mem_mb_test_sb_plugged(struct virtio_mem *vm, - unsigned long mb_id, int sb_id, - int count) +static bool virtio_mem_sbm_test_sb_plugged(struct virtio_mem *vm, + unsigned long mb_id, int sb_id, + int count) { - const int bit = virtio_mem_sb_bitmap_bit_nr(vm, mb_id, sb_id); + const int bit = virtio_mem_sbm_sb_state_bit_nr(vm, mb_id, sb_id); if (count == 1) - return test_bit(bit, vm->sb_bitmap); + return test_bit(bit, vm->sbm.sb_states); /* TODO: Helper similar to bitmap_set() */ - return find_next_zero_bit(vm->sb_bitmap, bit + count, bit) >= + return find_next_zero_bit(vm->sbm.sb_states, bit + count, bit) >= bit + count; } /* * Test if all selected subblocks are unplugged. */ -static bool virtio_mem_mb_test_sb_unplugged(struct virtio_mem *vm, - unsigned long mb_id, int sb_id, - int count) +static bool virtio_mem_sbm_test_sb_unplugged(struct virtio_mem *vm, + unsigned long mb_id, int sb_id, + int count) { - const int bit = virtio_mem_sb_bitmap_bit_nr(vm, mb_id, sb_id); + const int bit = virtio_mem_sbm_sb_state_bit_nr(vm, mb_id, sb_id); /* TODO: Helper similar to bitmap_set() */ - return find_next_bit(vm->sb_bitmap, bit + count, bit) >= bit + count; + return find_next_bit(vm->sbm.sb_states, bit + count, bit) >= + bit + count; } /* * Find the first unplugged subblock. Returns vm->nb_sb_per_mb in case there is * none. */ -static int virtio_mem_mb_first_unplugged_sb(struct virtio_mem *vm, +static int virtio_mem_sbm_first_unplugged_sb(struct virtio_mem *vm, unsigned long mb_id) { - const int bit = virtio_mem_sb_bitmap_bit_nr(vm, mb_id, 0); + const int bit = virtio_mem_sbm_sb_state_bit_nr(vm, mb_id, 0); - return find_next_zero_bit(vm->sb_bitmap, bit + vm->nb_sb_per_mb, bit) - - bit; + return find_next_zero_bit(vm->sbm.sb_states, + bit + vm->nb_sb_per_mb, bit) - bit; } /* * Prepare the subblock bitmap for the next memory block. */ -static int virtio_mem_sb_bitmap_prepare_next_mb(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; 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_sb_bitmap, *old_sb_bitmap; + unsigned long *new_bitmap, *old_bitmap; - if (vm->sb_bitmap && old_pages == new_pages) + if (vm->sbm.sb_states && old_pages == new_pages) return 0; - new_sb_bitmap = vzalloc(new_pages * PAGE_SIZE); - if (!new_sb_bitmap) + new_bitmap = vzalloc(new_pages * PAGE_SIZE); + if (!new_bitmap) return -ENOMEM; mutex_lock(&vm->hotplug_mutex); - if (new_sb_bitmap) - memcpy(new_sb_bitmap, vm->sb_bitmap, old_pages * PAGE_SIZE); + if (new_bitmap) + memcpy(new_bitmap, vm->sbm.sb_states, old_pages * PAGE_SIZE); - old_sb_bitmap = vm->sb_bitmap; - vm->sb_bitmap = new_sb_bitmap; + old_bitmap = vm->sbm.sb_states; + vm->sbm.sb_states = new_bitmap; mutex_unlock(&vm->hotplug_mutex); - vfree(old_sb_bitmap); + vfree(old_bitmap); return 0; } @@ -638,7 +645,7 @@ static void virtio_mem_notify_going_offline(struct virtio_mem *vm, int sb_id; for (sb_id = 0; sb_id < vm->nb_sb_per_mb; sb_id++) { - if (virtio_mem_mb_test_sb_plugged(vm, mb_id, sb_id, 1)) + 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); @@ -654,7 +661,7 @@ static void virtio_mem_notify_cancel_offline(struct virtio_mem *vm, int sb_id; for (sb_id = 0; sb_id < vm->nb_sb_per_mb; sb_id++) { - if (virtio_mem_mb_test_sb_plugged(vm, mb_id, sb_id, 1)) + 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); @@ -944,7 +951,7 @@ static void virtio_mem_online_page_cb(struct page *page, unsigned int order) * If plugged, online the pages, otherwise, set them fake * offline (PageOffline). */ - if (virtio_mem_mb_test_sb_plugged(vm, mb_id, sb_id, 1)) + if (virtio_mem_sbm_test_sb_plugged(vm, mb_id, sb_id, 1)) generic_online_page(page, order); else virtio_mem_set_fake_offline(PFN_DOWN(addr), 1 << order, @@ -1102,7 +1109,7 @@ static int virtio_mem_mb_plug_sb(struct virtio_mem *vm, unsigned long mb_id, rc = virtio_mem_send_plug_request(vm, addr, size); if (!rc) - virtio_mem_mb_set_sb_plugged(vm, mb_id, sb_id, count); + virtio_mem_sbm_set_sb_plugged(vm, mb_id, sb_id, count); return rc; } @@ -1120,7 +1127,7 @@ static int virtio_mem_mb_unplug_sb(struct virtio_mem *vm, unsigned long mb_id, rc = virtio_mem_send_unplug_request(vm, addr, size); if (!rc) - virtio_mem_mb_set_sb_unplugged(vm, mb_id, sb_id, count); + virtio_mem_sbm_set_sb_unplugged(vm, mb_id, sb_id, count); return rc; } @@ -1143,14 +1150,14 @@ static int virtio_mem_mb_unplug_any_sb(struct virtio_mem *vm, while (*nb_sb) { /* Find the next candidate subblock */ while (sb_id >= 0 && - virtio_mem_mb_test_sb_unplugged(vm, mb_id, sb_id, 1)) + virtio_mem_sbm_test_sb_unplugged(vm, mb_id, sb_id, 1)) sb_id--; if (sb_id < 0) break; /* Try to unplug multiple subblocks at a time */ count = 1; while (count < *nb_sb && sb_id > 0 && - virtio_mem_mb_test_sb_plugged(vm, mb_id, sb_id - 1, 1)) { + virtio_mem_sbm_test_sb_plugged(vm, mb_id, sb_id - 1, 1)) { count++; sb_id--; } @@ -1196,7 +1203,7 @@ static int virtio_mem_prepare_next_mb(struct virtio_mem *vm, return rc; /* Resize the subblock bitmap if required. */ - rc = virtio_mem_sb_bitmap_prepare_next_mb(vm); + rc = virtio_mem_sbm_sb_states_prepare_next_mb(vm); if (rc) return rc; @@ -1281,14 +1288,13 @@ static int virtio_mem_mb_plug_any_sb(struct virtio_mem *vm, unsigned long mb_id, return -EINVAL; while (*nb_sb) { - sb_id = virtio_mem_mb_first_unplugged_sb(vm, mb_id); + sb_id = virtio_mem_sbm_first_unplugged_sb(vm, mb_id); if (sb_id >= vm->nb_sb_per_mb) break; count = 1; while (count < *nb_sb && sb_id + count < vm->nb_sb_per_mb && - !virtio_mem_mb_test_sb_plugged(vm, mb_id, sb_id + count, - 1)) + !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); @@ -1305,7 +1311,7 @@ static int virtio_mem_mb_plug_any_sb(struct virtio_mem *vm, unsigned long mb_id, virtio_mem_fake_online(pfn, nr_pages); } - if (virtio_mem_mb_test_sb_plugged(vm, mb_id, 0, vm->nb_sb_per_mb)) { + if (virtio_mem_sbm_test_sb_plugged(vm, mb_id, 0, vm->nb_sb_per_mb)) { if (online) virtio_mem_sbm_set_mb_state(vm, mb_id, VIRTIO_MEM_SBM_MB_ONLINE); @@ -1405,13 +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_mb_test_sb_plugged(vm, mb_id, 0, vm->nb_sb_per_mb)) + if (!virtio_mem_sbm_test_sb_plugged(vm, mb_id, 0, vm->nb_sb_per_mb)) virtio_mem_sbm_set_mb_state(vm, mb_id, VIRTIO_MEM_SBM_MB_OFFLINE_PARTIAL); if (rc) return rc; - if (virtio_mem_mb_test_sb_unplugged(vm, mb_id, 0, vm->nb_sb_per_mb)) { + if (virtio_mem_sbm_test_sb_unplugged(vm, mb_id, 0, vm->nb_sb_per_mb)) { /* * Remove the block from Linux - this should never fail. * Hinder the block from getting onlined by marking it @@ -1480,7 +1486,7 @@ static int virtio_mem_mb_unplug_any_sb_online(struct virtio_mem *vm, /* If possible, try to unplug the complete block in one shot. */ if (*nb_sb >= vm->nb_sb_per_mb && - virtio_mem_mb_test_sb_plugged(vm, mb_id, 0, 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); if (!rc) { @@ -1494,7 +1500,7 @@ static int virtio_mem_mb_unplug_any_sb_online(struct virtio_mem *vm, for (sb_id = vm->nb_sb_per_mb - 1; sb_id >= 0 && *nb_sb; sb_id--) { /* Find the next candidate subblock */ while (sb_id >= 0 && - !virtio_mem_mb_test_sb_plugged(vm, mb_id, sb_id, 1)) + !virtio_mem_sbm_test_sb_plugged(vm, mb_id, sb_id, 1)) sb_id--; if (sb_id < 0) break; @@ -1513,7 +1519,7 @@ unplugged: * 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_mb_test_sb_unplugged(vm, mb_id, 0, vm->nb_sb_per_mb)) { + if (virtio_mem_sbm_test_sb_unplugged(vm, mb_id, 0, vm->nb_sb_per_mb)) { mutex_unlock(&vm->hotplug_mutex); rc = virtio_mem_mb_offline_and_remove(vm, mb_id); mutex_lock(&vm->hotplug_mutex); @@ -2035,7 +2041,7 @@ static void virtio_mem_remove(struct virtio_device *vdev) /* remove all tracking data - no locking needed */ vfree(vm->sbm.mb_states); - vfree(vm->sb_bitmap); + vfree(vm->sbm.sb_states); /* reset the device and cleanup the queues */ vdev->config->reset(vdev); |