diff options
| author | Ben Widawsky <bwidawsk@kernel.org> | 2022-04-11 01:26:13 +0300 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2022-07-22 03:19:25 +0300 |
| commit | 538831f1beb818c93e5879bf19de37d89ec88ed6 (patch) | |
| tree | 2d55fe7b36b3f4225ad03fbac113f581046ff843 /drivers/cxl | |
| parent | 391785859e7e6521f622ad8c965c9792767023bc (diff) | |
| download | linux-538831f1beb818c93e5879bf19de37d89ec88ed6.tar.xz | |
cxl/hdm: Add sysfs attributes for interleave ways + granularity
The region provisioning flow involves selecting interleave ways +
granularity settings for a region, and then programming the decoder
topology to meet those constraints, if possible. For example, root
decoders set the minimum interleave ways + granularity for any hosted
regions.
Given decoder programming is not atomic and collisions can occur between
multiple requesting regions userspace will be responsible for conflict
resolution and it needs these attributes to make those decisions.
Signed-off-by: Ben Widawsky <bwidawsk@kernel.org>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/165784332235.1758207.7185062713652694607.stgit@dwillia2-xfh.jf.intel.com
[djbw: reword changelog, make read-only, add sysfs ABI documentaion]
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/cxl')
| -rw-r--r-- | drivers/cxl/core/port.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c index c7f1844d58de..719563d85ce1 100644 --- a/drivers/cxl/core/port.c +++ b/drivers/cxl/core/port.c @@ -260,10 +260,33 @@ static ssize_t dpa_size_store(struct device *dev, struct device_attribute *attr, } static DEVICE_ATTR_RW(dpa_size); +static ssize_t interleave_granularity_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct cxl_decoder *cxld = to_cxl_decoder(dev); + + return sysfs_emit(buf, "%d\n", cxld->interleave_granularity); +} + +static DEVICE_ATTR_RO(interleave_granularity); + +static ssize_t interleave_ways_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct cxl_decoder *cxld = to_cxl_decoder(dev); + + return sysfs_emit(buf, "%d\n", cxld->interleave_ways); +} + +static DEVICE_ATTR_RO(interleave_ways); + static struct attribute *cxl_decoder_base_attrs[] = { &dev_attr_start.attr, &dev_attr_size.attr, &dev_attr_locked.attr, + &dev_attr_interleave_granularity.attr, + &dev_attr_interleave_ways.attr, NULL, }; |