diff options
Diffstat (limited to 'Documentation/ABI/testing')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-bus-cxl | 37 |
1 files changed, 36 insertions, 1 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-cxl b/Documentation/ABI/testing/sysfs-bus-cxl index 0b672248d126..1ab69aca6152 100644 --- a/Documentation/ABI/testing/sysfs-bus-cxl +++ b/Documentation/ABI/testing/sysfs-bus-cxl @@ -197,7 +197,7 @@ Date: May, 2022 KernelVersion: v5.20 Contact: linux-cxl@vger.kernel.org Description: - (RO) When a CXL decoder is of devtype "cxl_decoder_endpoint" it + (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 @@ -206,3 +206,38 @@ Description: when a decoder straddles the volatile/persistent partition boundary, and '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. + + +What: /sys/bus/cxl/devices/decoderX.Y/dpa_resource +Date: May, 2022 +KernelVersion: v5.20 +Contact: linux-cxl@vger.kernel.org +Description: + (RO) When a CXL decoder is of devtype "cxl_decoder_endpoint", + and its 'dpa_size' attribute is non-zero, this attribute + indicates the device physical address (DPA) base address of the + allocation. + + +What: /sys/bus/cxl/devices/decoderX.Y/dpa_size +Date: May, 2022 +KernelVersion: v5.20 +Contact: linux-cxl@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. The range, base address plus length in bytes, of + DPA allocated to this decoder is conveyed in these 2 attributes. + Allocations can be mutated as long as the decoder is in the + disabled state. A write to 'dpa_size' releases the previous DPA + allocation and then attempts to allocate from the free capacity + in the device partition referred to by 'decoderX.Y/mode'. + Allocate and free requests can only be performed on the highest + instance number disabled decoder with non-zero size. I.e. + allocations are enforced to occur in increasing 'decoderX.Y/id' + order and frees are enforced to occur in decreasing + 'decoderX.Y/id' order. |