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powerpc/powernv/vas: Define vas_init() and vas_exit()

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Implement vas_init() and vas_exit() functions for a new VAS module.
This VAS module is essentially a library for other device drivers
and kernel users of the NX coprocessors like NX-842 and NX-GZIP.
In the future this will be extended to add support for user space
to access the NX coprocessors.

VAS is currently only supported with 64K page size.

Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Sukadev Bhattiprolu
2017-08-28 23:23:33 -07:00
committed by Michael Ellerman
parent b6622a339e
commit 4dea2d1a92
7 changed files with 217 additions and 0 deletions
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22
Documentation/devicetree/bindings/powerpc/ibm,vas.txt Normal file
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* IBM Powerpc Virtual Accelerator Switchboard (VAS)
VAS is a hardware mechanism that allows kernel subsystems and user processes
to directly submit compression and other requests to Nest accelerators (NX)
or other coprocessors functions.
Required properties:
- compatible : should be "ibm,vas".
- ibm,vas-id : A unique identifier for each instance of VAS in the system
- reg : Should contain 4 pairs of 64-bit fields specifying the Hypervisor
window context start and length, OS/User window context start and length,
"Paste address" start and length, "Paste window id" start bit and number
of bits)
Example:
vas@6019100000000 {
compatible = "ibm,vas", "ibm,power9-vas";
reg = <0x6019100000000 0x2000000 0x6019000000000 0x100000000 0x8000000000000 0x100000000 0x20 0x10>;
name = "vas";
ibm,vas-id = <0x1>;
};