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| author | Carl Vanderlip <quic_carlv@quicinc.com> | 2023-11-17 18:43:37 +0100 |
|---|---|---|
| committer | Jeffrey Hugo <quic_jhugo@quicinc.com> | 2023-12-01 18:37:06 +0100 |
| commit | 5f0a0ebca2b98eeda10715433c7d9418ef2e6d01 (patch) | |
| tree | 37ba724f17d351f05e44db2c9220ced34c33346a /Documentation | |
| parent | accel/qaic: Increase number of in_reset states (diff) | |
| download | linux-5f0a0ebca2b98eeda10715433c7d9418ef2e6d01.tar.xz linux-5f0a0ebca2b98eeda10715433c7d9418ef2e6d01.zip | |
accel/qaic: Expand DRM device lifecycle
Currently the QAIC DRM device registers itself when the MHI QAIC_CONTROL
channel becomes available. This is when the device is able to process
workloads. However, the DRM driver also provides the debugfs interface
bootlog for the device. If the device fails to boot to the QSM (which
brings up the MHI QAIC_CONTROL channel), the bootlog won't be available for
debugging why it failed to boot.
Change when the DRM device registers itself from when QAIC_CONTROL is
available to when the card is first probed on the PCI bus. Additionally,
make the DRM driver persist through reset/error cases so the driver
doesn't have to be reloaded to access the card again. Send
KOBJ_ONLINE/OFFLINE uevents so userspace can know when DRM device is
ready to handle requests.
Signed-off-by: Carl Vanderlip <quic_carlv@quicinc.com>
Reviewed-by: Pranjal Ramajor Asha Kanojiya <quic_pkanojiy@quicinc.com>
Reviewed-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
Signed-off-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
Reviewed-by: Jacek Lawrynowicz <jacek.lawrynowicz@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231117174337.20174-3-quic_jhugo@quicinc.com
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/accel/qaic/qaic.rst | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/Documentation/accel/qaic/qaic.rst b/Documentation/accel/qaic/qaic.rst index f81020736ebf..efb7771273bb 100644 --- a/Documentation/accel/qaic/qaic.rst +++ b/Documentation/accel/qaic/qaic.rst @@ -93,8 +93,15 @@ commands (does not impact QAIC). uAPI ==== +QAIC creates an accel device per phsyical PCIe device. This accel device exists +for as long as the PCIe device is known to Linux. + +The PCIe device may not be in the state to accept requests from userspace at +all times. QAIC will trigger KOBJ_ONLINE/OFFLINE uevents to advertise when the +device can accept requests (ONLINE) and when the device is no longer accepting +requests (OFFLINE) because of a reset or other state transition. + QAIC defines a number of driver specific IOCTLs as part of the userspace API. -This section describes those APIs. DRM_IOCTL_QAIC_MANAGE This IOCTL allows userspace to send a NNC request to the QSM. The call will |