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Wong" , Randy Dunlap , Jeff Layton , Amir Goldstein , Jonathan Cameron , Stefan Hajnoczi , Joanne Koong , Josef Bacik , Bagas Sanjaya , Chen Linxuan , James Morse , Fuad Tabba , Sean Christopherson , Shivank Garg , Ackerley Tng , Gregory Price , Aravind Ramesh , Ajay Joshi , venkataravis@micron.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, nvdimm@lists.linux.dev, linux-cxl@vger.kernel.org, linux-fsdevel@vger.kernel.org, John Groves Subject: [PATCH V3 03/21] dax: Save the kva from memremap Date: Wed, 7 Jan 2026 09:33:12 -0600 Message-ID: <20260107153332.64727-4-john@groves.net> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20260107153332.64727-1-john@groves.net> References: <20260107153244.64703-1-john@groves.net> <20260107153332.64727-1-john@groves.net> Precedence: bulk X-Mailing-List: linux-cxl@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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. (also fill in missing kerneldoc comment fields for struct dev_dax) Signed-off-by: John Groves --- drivers/dax/dax-private.h | 4 ++++ drivers/dax/fsdev.c | 1 + 2 files changed, 5 insertions(+) diff --git a/drivers/dax/dax-private.h b/drivers/dax/dax-private.h index 0867115aeef2..1bb1631af485 100644 --- a/drivers/dax/dax-private.h +++ b/drivers/dax/dax-private.h @@ -69,18 +69,22 @@ 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 + * @align - alignment of this instance * @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 * @ida: mapping id allocator * @dev - device core * @pgmap - pgmap for memmap setup / lifetime (driver owned) + * @memmap_on_memory - allow kmem to put the memmap in the memory * @nr_range: size of @ranges * @ranges: range tuples of memory used */ 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 2a3249d1529c..c5c660b193e5 100644 --- a/drivers/dax/fsdev.c +++ b/drivers/dax/fsdev.c @@ -235,6 +235,7 @@ 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; -- 2.49.0