Endpoints can now support a single dynamic ram partition following the
persistent memory partition.
Expand the mode to allow a decoder to point to the first dynamic ram
partition.
Signed-off-by: Ira Weiny <ira.we...@intel.com>
---
Changes:
[iweiny: completely re-written]
---
Documentation/ABI/testing/sysfs-bus-cxl | 18 +++++++++---------
drivers/cxl/core/port.c | 4 ++++
2 files changed, 13 insertions(+), 9 deletions(-)
diff --git a/Documentation/ABI/testing/sysfs-bus-cxl
b/Documentation/ABI/testing/sysfs-bus-cxl
index 2b59041bb410..b2754e6047ca 100644
--- a/Documentation/ABI/testing/sysfs-bus-cxl
+++ b/Documentation/ABI/testing/sysfs-bus-cxl
@@ -358,22 +358,22 @@ Description:
What: /sys/bus/cxl/devices/decoderX.Y/mode
-Date: May, 2022
-KernelVersion: v6.0
+Date: May, 2022, May 2025
+KernelVersion: v6.0, v6.16 (dynamic_ram_a)
Contact: linux-...@vger.kernel.org
Description:
(RW) When a CXL decoder is of devtype "cxl_decoder_endpoint" it
translates from a host physical address range, to a device
local address range. Device-local address ranges are further
- split into a 'ram' (volatile memory) range and 'pmem'
- (persistent memory) range. The 'mode' attribute emits one of
- 'ram', 'pmem', or 'none'. The 'none' indicates the decoder is
- not actively decoding, or no DPA allocation policy has been
- set.
+ split into a 'ram' (volatile memory) range, 'pmem' (persistent
+ memory), and 'dynamic_ram_a' (first Dynamic RAM) range. The
+ 'mode' attribute emits one of 'ram', 'pmem', 'dynamic_ram_a' or
+ 'none'. The 'none' indicates the decoder is not actively
+ decoding, or no DPA allocation policy has been set.
'mode' can be written, when the decoder is in the 'disabled'
- state, with either 'ram' or 'pmem' to set the boundaries for the
- next allocation.
+ state, with either 'ram', 'pmem', or 'dynamic_ram_a' to set the
+ boundaries for the next allocation.
What: /sys/bus/cxl/devices/decoderX.Y/dpa_resource
diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c
index 0fd6646c1a2e..e98605bd39b4 100644
--- a/drivers/cxl/core/port.c
+++ b/drivers/cxl/core/port.c
@@ -125,6 +125,7 @@ static DEVICE_ATTR_RO(name)
CXL_DECODER_FLAG_ATTR(cap_pmem, CXL_DECODER_F_PMEM);
CXL_DECODER_FLAG_ATTR(cap_ram, CXL_DECODER_F_RAM);
+CXL_DECODER_FLAG_ATTR(cap_dynamic_ram_a, CXL_DECODER_F_RAM);
CXL_DECODER_FLAG_ATTR(cap_type2, CXL_DECODER_F_TYPE2);
CXL_DECODER_FLAG_ATTR(cap_type3, CXL_DECODER_F_TYPE3);
CXL_DECODER_FLAG_ATTR(locked, CXL_DECODER_F_LOCK);
@@ -219,6 +220,8 @@ static ssize_t mode_store(struct device *dev, struct
device_attribute *attr,
mode = CXL_PARTMODE_PMEM;
else if (sysfs_streq(buf, "ram"))
mode = CXL_PARTMODE_RAM;
+ else if (sysfs_streq(buf, "dynamic_ram_a"))
+ mode = CXL_PARTMODE_DYNAMIC_RAM_A;
else
return -EINVAL;
@@ -324,6 +327,7 @@ static struct attribute_group
cxl_decoder_base_attribute_group = {
static struct attribute *cxl_decoder_root_attrs[] = {
&dev_attr_cap_pmem.attr,
&dev_attr_cap_ram.attr,
+ &dev_attr_cap_dynamic_ram_a.attr,
&dev_attr_cap_type2.attr,
&dev_attr_cap_type3.attr,
&dev_attr_target_list.attr,
--
2.49.0
