A few minor things inline from a fresh read.
Other than maybe a missing header, the others are all trivial
and you can make your own minds up.
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxx>
> #endif /* __CXL_CORE_H__ */
> diff --git a/drivers/cxl/core/extent.c b/drivers/cxl/core/extent.c
> new file mode 100644
> index 0000000000000000000000000000000000000000..315aa46252c15dcefe175da87522505f8ecf537c
> --- /dev/null
> +++ b/drivers/cxl/core/extent.c
> @@ -0,0 +1,372 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/* Copyright(c) 2024 Intel Corporation. All rights reserved. */
> +
> +#include <linux/device.h>
> +#include <cxl.h>
> +static bool extents_contain(struct cxl_dax_region *cxlr_dax,
> + struct cxl_endpoint_decoder *cxled,
> + struct range *new_range)
> +{
> + struct match_data md = {
> + .cxled = cxled,
> + .new_range = new_range,
> + };
> +
> + struct device *extent_device __free(put_device)
> + = device_find_child(&cxlr_dax->dev, &md, match_contains);
> + if (!extent_device)
> + return false;
> +
> + return true;
trivial but could do.
return extent_device != NULL;
> +}
> +static bool extents_overlap(struct cxl_dax_region *cxlr_dax,
> + struct cxl_endpoint_decoder *cxled,
> + struct range *new_range)
> +{
> + struct match_data md = {
> + .cxled = cxled,
> + .new_range = new_range,
> + };
> +
> + struct device *extent_device __free(put_device)
> + = device_find_child(&cxlr_dax->dev, &md, match_overlaps);
> + if (!extent_device)
> + return false;
> +
> + return true;
As above.
> +}
> +static int cxlr_rm_extent(struct device *dev, void *data)
> +{
> + struct region_extent *region_extent = to_region_extent(dev);
> + struct range *region_hpa_range = data;
> +
> + if (!region_extent)
> + return 0;
> +
> + /*
> + * Any extent which 'touches' the released range is removed.
Maybe single line comment syntax is fine here.
> + */
> + if (range_overlaps(region_hpa_range, ®ion_extent->hpa_range)) {
> + dev_dbg(dev, "Remove region extent HPA [range 0x%016llx-0x%016llx]\n",
> + region_extent->hpa_range.start, region_extent->hpa_range.end);
> + region_rm_extent(region_extent);
> + }
> + return 0;
> +}
> +/* Callers are expected to ensure cxled has been attached to a region */
> +int cxl_add_extent(struct cxl_memdev_state *mds, struct cxl_extent *extent)
> +{
> + u64 start_dpa = le64_to_cpu(extent->start_dpa);
> + struct cxl_memdev *cxlmd = mds->cxlds.cxlmd;
> + struct cxl_endpoint_decoder *cxled;
> + struct range ed_range, ext_range;
> + struct cxl_dax_region *cxlr_dax;
> + struct cxled_extent *ed_extent;
> + struct cxl_region *cxlr;
> + struct device *dev;
> +
> + ext_range = (struct range) {
> + .start = start_dpa,
> + .end = start_dpa + le64_to_cpu(extent->length) - 1,
> + };
> +
>
> diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h
> index 16e06b59d7f04762ca73a81740b0d6b2487301af..85b30a74a6fa5de1dd99c08c8318edd204e3e19d 100644
> --- a/drivers/cxl/cxlmem.h
> +++ b/drivers/cxl/cxlmem.h
Is the xarray header included in here already?
If not it should be.
> @@ -506,6 +506,7 @@ static inline struct cxl_dev_state *mbox_to_cxlds(struct cxl_mailbox *cxl_mbox)
> * @pmem_perf: performance data entry matched to PMEM partition
> * @nr_dc_region: number of DC regions implemented in the memory device
> * @dc_region: array containing info about the DC regions
