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md/nvme: Enable PCI P2PDMA support for RAID0 and NVMe Multipath #834

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md/nvme: Enable PCI P2PDMA support for RAID0 and NVMe Multipath #834

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bf8d57c
block: clear BLK_FEAT_PCI_P2PDMA in blk_stack_limits() for non-suppor…
May 13, 2026
81d41f4
md: propagate BLK_FEAT_PCI_P2PDMA from member devices to RAID device
KiranModukuri May 13, 2026
1948944
nvme-multipath: enable PCI P2PDMA for multipath devices
KiranModukuri May 13, 2026
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2 changes: 2 additions & 0 deletions block/blk-settings.c
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Original file line number Diff line number Diff line change
Expand Up @@ -795,6 +795,8 @@ int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
t->features &= ~BLK_FEAT_NOWAIT;
if (!(b->features & BLK_FEAT_POLL))
t->features &= ~BLK_FEAT_POLL;
if (!(b->features & BLK_FEAT_PCI_P2PDMA))
t->features &= ~BLK_FEAT_PCI_P2PDMA;

t->flags |= (b->flags & BLK_FLAG_MISALIGNED);

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1 change: 1 addition & 0 deletions drivers/md/raid0.c
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Expand Up @@ -392,6 +392,7 @@ static int raid0_set_limits(struct mddev *mddev)
lim.io_opt = lim.io_min * mddev->raid_disks;
lim.chunk_sectors = mddev->chunk_sectors;
lim.features |= BLK_FEAT_ATOMIC_WRITES;
lim.features |= BLK_FEAT_PCI_P2PDMA;
err = mddev_stack_rdev_limits(mddev, &lim, MDDEV_STACK_INTEGRITY);
if (err)
return err;
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1 change: 1 addition & 0 deletions drivers/md/raid1.c
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Expand Up @@ -3208,6 +3208,7 @@ static int raid1_set_limits(struct mddev *mddev)
lim.max_hw_wzeroes_unmap_sectors = 0;
lim.logical_block_size = mddev->logical_block_size;
lim.features |= BLK_FEAT_ATOMIC_WRITES;
lim.features |= BLK_FEAT_PCI_P2PDMA;
err = mddev_stack_rdev_limits(mddev, &lim, MDDEV_STACK_INTEGRITY);
if (err)
return err;
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1 change: 1 addition & 0 deletions drivers/md/raid10.c
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Expand Up @@ -3941,6 +3941,7 @@ static int raid10_set_queue_limits(struct mddev *mddev)
lim.chunk_sectors = mddev->chunk_sectors;
lim.io_opt = lim.io_min * raid10_nr_stripes(conf);
lim.features |= BLK_FEAT_ATOMIC_WRITES;
lim.features |= BLK_FEAT_PCI_P2PDMA;
err = mddev_stack_rdev_limits(mddev, &lim, MDDEV_STACK_INTEGRITY);
if (err)
return err;
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2 changes: 1 addition & 1 deletion drivers/nvme/host/multipath.c
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Expand Up @@ -730,7 +730,7 @@ int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl, struct nvme_ns_head *head)
blk_set_stacking_limits(&lim);
lim.dma_alignment = 3;
lim.features |= BLK_FEAT_IO_STAT | BLK_FEAT_NOWAIT |
BLK_FEAT_POLL | BLK_FEAT_ATOMIC_WRITES;
BLK_FEAT_POLL | BLK_FEAT_ATOMIC_WRITES | BLK_FEAT_PCI_P2PDMA;
if (head->ids.csi == NVME_CSI_ZNS)
lim.features |= BLK_FEAT_ZONED;

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