cxl: Add psl9 specific code
The new Coherent Accelerator Interface Architecture, level 2, for the
IBM POWER9 brings new content and features:
- POWER9 Service Layer
- Registers
- Radix mode
- Process element entry
- Dedicated-Shared Process Programming Model
- Translation Fault Handling
- CAPP
- Memory Context ID
If a valid mm_struct is found the memory context id is used for each
transaction associated with the process handle. The PSL uses the
context ID to find the corresponding process element.
Signed-off-by: Christophe Lombard <clombard@linux.vnet.ibm.com>
Acked-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
[mpe: Fixup comment formatting, unsplit long strings]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
diff --git a/Documentation/powerpc/cxl.txt b/Documentation/powerpc/cxl.txt
index d5506ba0..c5e8d50 100644
--- a/Documentation/powerpc/cxl.txt
+++ b/Documentation/powerpc/cxl.txt
@@ -21,7 +21,7 @@
Hardware overview
=================
- POWER8 FPGA
+ POWER8/9 FPGA
+----------+ +---------+
| | | |
| CPU | | AFU |
@@ -34,7 +34,7 @@
| | CAPP |<------>| |
+---+------+ PCIE +---------+
- The POWER8 chip has a Coherently Attached Processor Proxy (CAPP)
+ The POWER8/9 chip has a Coherently Attached Processor Proxy (CAPP)
unit which is part of the PCIe Host Bridge (PHB). This is managed
by Linux by calls into OPAL. Linux doesn't directly program the
CAPP.
@@ -59,6 +59,17 @@
the fault. The context to which this fault is serviced is based on
who owns that acceleration function.
+ POWER8 <-----> PSL Version 8 is compliant to the CAIA Version 1.0.
+ POWER9 <-----> PSL Version 9 is compliant to the CAIA Version 2.0.
+ This PSL Version 9 provides new features such as:
+ * Interaction with the nest MMU on the P9 chip.
+ * Native DMA support.
+ * Supports sending ASB_Notify messages for host thread wakeup.
+ * Supports Atomic operations.
+ * ....
+
+ Cards with a PSL9 won't work on a POWER8 system and cards with a
+ PSL8 won't work on a POWER9 system.
AFU Modes
=========