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cxl/region: Add a mode attribute for regions

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In preparation for a new region type, "ram" regions, add a mode
attribute to clarify the mode of the decoders that can be added to a
region. Share the internals of mode_show() (for decoders) with the
region case.

Reviewed-by: Vishal Verma <vishal.l.verma@intel.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Gregory Price <gregory.price@memverge.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Tested-by: Fan Ni <fan.ni@samsung.com>
Link: https://lore.kernel.org/r/167601993930.1924368.4305018565539515665.stgit@dwillia2-xfh.jf.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2023-02-10 01:05:39 -08:00
parent 8752efd2c7
commit 7d505f982f
4 changed files with 36 additions and 11 deletions
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11
Documentation/ABI/testing/sysfs-bus-cxl
View File

@ -358,6 +358,17 @@ Description:
results in the same address being allocated.
What: /sys/bus/cxl/devices/regionZ/mode
Date: January, 2023
KernelVersion: v6.3
Contact: linux-cxl@vger.kernel.org
Description:
(RO) The mode of a region is established at region creation time
and dictates the mode of the endpoint decoder that comprise the
region. For more details on the possible modes see
/sys/bus/cxl/devices/decoderX.Y/mode
What: /sys/bus/cxl/devices/regionZ/resource
Date: May, 2022
KernelVersion: v6.0

12
drivers/cxl/core/port.c
View File

@ -180,17 +180,7 @@ static ssize_t mode_show(struct device *dev, struct device_attribute *attr,
{
struct cxl_endpoint_decoder *cxled = to_cxl_endpoint_decoder(dev);
switch (cxled->mode) {
case CXL_DECODER_RAM:
return sysfs_emit(buf, "ram\n");
case CXL_DECODER_PMEM:
return sysfs_emit(buf, "pmem\n");
case CXL_DECODER_NONE:
return sysfs_emit(buf, "none\n");
case CXL_DECODER_MIXED:
default:
return sysfs_emit(buf, "mixed\n");
}
return sysfs_emit(buf, "%s\n", cxl_decoder_mode_name(cxled->mode));
}
static ssize_t mode_store(struct device *dev, struct device_attribute *attr,

10
drivers/cxl/core/region.c
View File

@ -458,6 +458,15 @@ static ssize_t resource_show(struct device *dev, struct device_attribute *attr,
}
static DEVICE_ATTR_RO(resource);
static ssize_t mode_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct cxl_region *cxlr = to_cxl_region(dev);
return sysfs_emit(buf, "%s\n", cxl_decoder_mode_name(cxlr->mode));
}
static DEVICE_ATTR_RO(mode);
static int alloc_hpa(struct cxl_region *cxlr, resource_size_t size)
{
struct cxl_root_decoder *cxlrd = to_cxl_root_decoder(cxlr->dev.parent);
@ -585,6 +594,7 @@ static struct attribute *cxl_region_attrs[] = {
&dev_attr_interleave_granularity.attr,
&dev_attr_resource.attr,
&dev_attr_size.attr,
&dev_attr_mode.attr,
NULL,
};

14
drivers/cxl/cxl.h
View File

@ -320,6 +320,20 @@ enum cxl_decoder_mode {
CXL_DECODER_DEAD,
};
static inline const char *cxl_decoder_mode_name(enum cxl_decoder_mode mode)
{
static const char * const names[] = {
[CXL_DECODER_NONE] = "none",
[CXL_DECODER_RAM] = "ram",
[CXL_DECODER_PMEM] = "pmem",
[CXL_DECODER_MIXED] = "mixed",
};
if (mode >= CXL_DECODER_NONE && mode <= CXL_DECODER_MIXED)
return names[mode];
return "mixed";
}
/**
* struct cxl_endpoint_decoder - Endpoint / SPA to DPA decoder
* @cxld: base cxl_decoder_object