drm/amdkfd: Trap handler support for expert scheduling mode

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commit b7851f8c66 upstream.

The trap may be entered with dependency checking disabled.
Wait for dependency counters and save/restore scheduling mode.

v2:

Use ttmp1 instead of ttmp11. ttmp11 is not zero-initialized.
While the trap handler does zero this field before use, a user-mode
second-level trap handler could not rely on this being zero when
using an older kernel mode driver.

v3:

Use ttmp11 primarily but copy to ttmp1 before jumping to the
second level trap handler. ttmp1 is inspectable by a debugger.
Unexpected bits in the unused space may regress existing software.

Signed-off-by: Jay Cornwall <jay.cornwall@amd.com>
Reviewed-by: Lancelot Six <lancelot.six@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 4238888794)
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Jay Cornwall 2025-11-14 14:32:42 -06:00 • committed by Greg Kroah-Hartman

parent 7f26af7bf9

commit eb1494204d

2 changed files with 73 additions and 26 deletions

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62

drivers/gpu/drm/amd/amdkfd/cwsr_trap_handler.h

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37

drivers/gpu/drm/amd/amdkfd/cwsr_trap_handler_gfx12.asm

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