[PATCH V7 04/19] dax: Save the kva from memremap
From: John Groves <hidden>
Date: 2026-01-18 22:31:46
Also in:
linux-cxl, linux-fsdevel, lkml, nvdimm
Subsystem:
device direct access (dax), device direct access (dax) [fsdev_dax], the rest · Maintainers:
Dan Williams, Vishal Verma, Dave Jiang, Alison Schofield, John Groves, Linus Torvalds
From: John Groves <john@groves.net> Save the kva from memremap because we need it for iomap rw support. Prior to famfs, there were no iomap users of /dev/dax - so the virtual address from memremap was not needed. Signed-off-by: John Groves <john@groves.net> --- drivers/dax/dax-private.h | 2 ++ drivers/dax/fsdev.c | 1 + 2 files changed, 3 insertions(+)
diff --git a/drivers/dax/dax-private.h b/drivers/dax/dax-private.h
index 0867115aeef2..4ae4d829d3ee 100644
--- a/drivers/dax/dax-private.h
+++ b/drivers/dax/dax-private.h@@ -69,6 +69,7 @@ struct dev_dax_range { * data while the device is activated in the driver. * @region - parent region * @dax_dev - core dax functionality + * @virt_addr: kva from memremap; used by fsdev_dax * @target_node: effective numa node if dev_dax memory range is onlined * @dyn_id: is this a dynamic or statically created instance * @id: ida allocated id when the dax_region is not static
@@ -81,6 +82,7 @@ struct dev_dax_range { struct dev_dax { struct dax_region *region; struct dax_device *dax_dev; + void *virt_addr; unsigned int align; int target_node; bool dyn_id;
diff --git a/drivers/dax/fsdev.c b/drivers/dax/fsdev.c
index 29b7345f65b1..72f78f606e06 100644
--- a/drivers/dax/fsdev.c
+++ b/drivers/dax/fsdev.c@@ -201,6 +201,7 @@ static int fsdev_dax_probe(struct dev_dax *dev_dax) pr_debug("%s: offset detected phys=%llx pgmap_phys=%llx offset=%llx\n", __func__, phys, pgmap_phys, data_offset); } + dev_dax->virt_addr = addr + data_offset; inode = dax_inode(dax_dev); cdev = inode->i_cdev;
--
2.52.0