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| author | Haren Myneni <haren@linux.vnet.ibm.com> | 2019-10-26 01:47:35 -0700 |
|---|---|---|
| committer | Oliver O'Halloran <oohall@gmail.com> | 2019-11-05 19:39:16 +1100 |
| commit | ad8cdd0f83bf55e9717326afb7af6eeedb33e031 (patch) | |
| tree | c1751e19b530eb692712c6ab6db2ebef2aa2f322 /doc | |
| parent | c3bfa320955967c943348dc526828de3d278fdbc (diff) | |
| download | skiboot-ad8cdd0f83bf55e9717326afb7af6eeedb33e031.zip skiboot-ad8cdd0f83bf55e9717326afb7af6eeedb33e031.tar.gz skiboot-ad8cdd0f83bf55e9717326afb7af6eeedb33e031.tar.bz2 | |
VAS: Alloc IRQ and port address for each VAS instance
Setup IRQ and trigger port for each VAS instance. Export these
values through device-tree with 'interrupts' and 'ibm,vas-port'
properties in each VAS device node. Kernel setup IRQ and register
port address for each send window.
Enable 'vas-user-space' NVRAM config to allocate IRQ sources and
provide 'interrupts' property.
nvram -p ibm,skiboot --update-config vas-user-space=enable
Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Signed-off-by: Haren Myneni <haren@us.ibm.com>
Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/device-tree/vas.rst | 6 | ||||
| -rw-r--r-- | doc/vas.rst | 15 |
2 files changed, 21 insertions, 0 deletions
diff --git a/doc/device-tree/vas.rst b/doc/device-tree/vas.rst index 438e45f..7c11c78 100644 --- a/doc/device-tree/vas.rst +++ b/doc/device-tree/vas.rst @@ -18,6 +18,12 @@ Each VAS node contains: :: ibm,vas-id: unique identifier for each instance of VAS in the system. + ibm,vas-port: Port address for the interrupt. + + interrupts: <IRQ# level> for this VAS instance. + + interrupt-parent: Interrupt controller phandle. + reg: contains 8 64-bit fields. Fields [0] and [1] represent the Hypervisor window context BAR diff --git a/doc/vas.rst b/doc/vas.rst new file mode 100644 index 0000000..5ec6593 --- /dev/null +++ b/doc/vas.rst @@ -0,0 +1,15 @@ +Virtual Accelerator Switchboard (VAS) + +This document provides information about using VAS from user space. +Applications send NX requests using COPY/PASTE instructions. NX raises +an interrupt when it sees fault on the request buffer. Kernel handles +the interrupt and process the fault. + +Skiboot allocates the IRQ and exports it with interrupts property. To +provide backward compatibility for older kernels, enable VAS user space +support with NVRAM command. + + nvram -p ibm,skiboot --update-config vas-user-space=enable + +This nvram config update is temporary and can be removed in future if +not needed. |