amdkfd uses cpu_relax() in its sync_with_hw() function. Because cpu_relax() is
defined as 'REP; NOP' on x86_64, it will block the CPU from servicing
IOMMU PPR requests.
This may cause a deadlock, because sync_with_hw() won't be completed
until the PPR request has been served.
Therefore, we need to use schedule() instead of cpu_relax() as it is the
minimum requirement to allow other threads to execute.
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Oded Gabbay <oded.gabbay@amd.com>
This patch was done due to sparse warning. It changes the definition of
doorbell_ptr in queue_properties to be with __iomem attribute, so it would
match the type which the doorbell module functions are returning.
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Oded Gabbay <oded.gabbay@amd.com>
The kernel queue module enables the amdkfd to establish kernel queues, not
exposed to user space.
The kernel queues are used for HIQ (HSA Interface Queue) and DIQ (Debug
Interface Queue) operations
v3: Removed use of internal typedefs and added use of the new gart allocation
functions
v4: Fixed a miscalculation in kernel queue wrapping
v5:
Move amdkfd from drm/radeon/ to drm/amd/
Change format of mqd structure to match latest KV firmware
Add support for AQL queues creation to enable working with open-source HSA
runtime
Add define for kernel queue size
Various fixes
Signed-off-by: Ben Goz <ben.goz@amd.com>
Signed-off-by: Oded Gabbay <oded.gabbay@amd.com>
