On 11/10/2019 10:06, christophe lombard wrote:
On 11/10/2019 00:34, Andrew Donnellan wrote:
On 10/10/19 2:11 am, christophe lombard wrote:
This series moves the definition and the management of scheduled
process area
(SPA) and of the templates (Transaction Layer) for an ocxl card,
using the
OCAPI interface. The code is now located in the specific arch powerpc
platform.
These patches will help for a futur implementation of the ocxl driver
in QEMU.
Could you explain more about this?
The Scheduled Processes Area and the configuration of the Transaction
Layer are specific to the AFU and more generally to the Opencapi
device.
Running the ocxl module in a guest environment, and later in several
guests in parallel, using the same Opencapi device and the same AFus,
involves to have a common code handling the SPA. This explains why these
parts of the ocxl driver will move to arch powerpc platform running on
the host.
Thanks.
Implementation of the ocxl driver running on a QEMU guest environment
will be detailed in the following patches but basically, a new ocxl vfio
driver, running in the host, will interact, in side, with the SPA, using
the pnv_ api(s) and on the other hand will interact, through ioctl
commands, with the guest(s). Ocxl, running in the guest, through hcalls
(handled by QEMU) will configure the device and interact with the vfio
through ioctl commands.
Andrew
The Open Coherently Attached Processor Interface (OCAPI) is used to
allow an Attached Functional Unit (AFU) to connect to the Processor
Chip's system bus in a high speed and cache coherent manner.
It builds on top of the existing ocxl driver.
It has been tested in a bare-metal environment using the memcpy and
the AFP AFUs.
christophe lombard (2):
powerpc/powernv: ocxl move SPA definition
powerpc/powernv: ocxl move TL definition
arch/powerpc/include/asm/pnv-ocxl.h | 30 +-
arch/powerpc/platforms/powernv/ocxl.c | 378 +++++++++++++++++++++++---
drivers/misc/ocxl/afu_irq.c | 1 -
drivers/misc/ocxl/config.c | 89 +-----
drivers/misc/ocxl/link.c | 347 +++++++----------------
drivers/misc/ocxl/ocxl_internal.h | 12 -
drivers/misc/ocxl/trace.h | 34 +--
7 files changed, 467 insertions(+), 424 deletions(-)
