The first GDT descriptor is reserved as 'NULL descriptor'. As bits 0
and 1 of a segment selector, i.e., the RPL bits, are NOT used to index
GDT, selector values 0~3 all point to the NULL descriptor, thus values
0, 1, 2 and 3 are all valid NULL selector values.
When a NULL selector value is to be loaded into a segment register,
reload_segments() sets its RPL bits. Later IRET zeros ES, FS, GS, and
DS segment registers if any of them is found to have any nonzero NULL
selector value. The two operations offset each other to actually effect
a nop.
Besides, zeroing of RPL in NULL selector values is an information leak
in pre-FRED systems as userspace can spot any interrupt/exception by
loading a nonzero NULL selector, and waiting for it to become zero.
But there is nothing software can do to prevent it before FRED.
ERETU, the only legit instruction to return to userspace from kernel
under FRED, by design does NOT zero any segment register to avoid this
problem behavior.
As such, leave NULL selector values 0~3 unchanged and close the leak.
Do the same on 32-bit kernel as well.
Signed-off-by: Xin Li (Intel) <xin@zytor.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20241126184529.1607334-1-xin@zytor.com
Add support for Adreno 623 GPU found in QCS8300 chipsets.
Signed-off-by: Jie Zhang <quic_jiezh@quicinc.com>
Signed-off-by: Akhil P Oommen <quic_akhilpo@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/640056/
Signed-off-by: Rob Clark <robdclark@chromium.org>
Adreno 621 has a different memory map for GPUCC block. So update
a6xx_gpu_state code to dump the correct set of gpucc registers.
Signed-off-by: Jie Zhang <quic_jiezh@quicinc.com>
Signed-off-by: Akhil P Oommen <quic_akhilpo@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/640055/
Signed-off-by: Rob Clark <robdclark@chromium.org>
Some GPUs have different memory map for GPUCC block. So split out the
gpucc range from a6xx_gmu_cx_registers to a separate block to
accommodate those GPUs.
Signed-off-by: Jie Zhang <quic_jiezh@quicinc.com>
Signed-off-by: Akhil P Oommen <quic_akhilpo@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/640052/
Signed-off-by: Rob Clark <robdclark@chromium.org>
The SUBMIT_ERROR() macro turns the error code negative. This extra '-'
operation turns it back to positive EINVAL again. The error code is
passed to ERR_PTR() and since positive values are not an IS_ERR() it
eventually will lead to an oops. Delete the '-'.
Fixes: 866e43b945 ("drm/msm: UAPI error reporting")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/637625/
Signed-off-by: Rob Clark <robdclark@chromium.org>
They are noops on GFX12. There is no suspend/resume all support
in firmware so the function doesn't do anything. KFD already
handles its own queues and they should already be unmapped at this
point so even if this runs, it's not doing anything.
Reviewed-by: Shaoyun.liu <Shaoyun.liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
The last use of optc3_fpu_set_vrr_m_const() was removed in 2022's
commit 64f991590f ("drm/amd/display: Fix a compilation failure on PowerPC
caused by FPU code")
which removed the only caller (with a similar) name.
Remove it.
Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
DRM_ERROR() is no longer preferred. Replace DRM_ERROR() usage
with drm_err() in isp driver.
Signed-off-by: Pratap Nirujogi <pratap.nirujogi@amd.com>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
All dce command_table_helper's shares a copy-pasted collection
of copy-pasted functions, which are: phy_id_to_atom,
clock_source_id_to_atom_phy_clk_src_id, and engine_bp_to_atom.
This patch removes the multiple copy-pasted by moving them to
the command_table_helper.c and make the command_table_helper's
calls the functions implemented by the command_table_helper.c
instead.
The changes were not tested on actual hardware. I am only able
to verify that the changes keep the code compileable and do my
best to to look repeatedly if I am not actually changing any code.
This is the version 4 of the PATCH, fixed comments about
licence in the new files and the matches From email to
Signed-off-by email. Fixed comments about using
command_table_helper instead of creating a dce_common
Signed-off-by: Luan Icaro Pinto Arcanjo <luanicaro@usp.br>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
If each instance uses the same fw image, only store one
copy in the driver.
Acked-by: Boyuan Zhang <Boyuan.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Use the vcn instance power gating callbacks rather than
the IP powergating callback. This limits power gating to
only the instance in use rather than all of the instances.
Reviewed-by: Boyuan Zhang <Boyuan.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This is per instance so add a new function pointer for it.
Reviewed-by: Boyuan Zhang <Boyuan.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Change it to take a vcn instance rather than adev to align
with the vcn instance changes.
TODO: clean up the function internals to use the vinst state
directly rather than accessing it indirectly via adev->vcn.inst[].
Reviewed-by: Boyuan Zhang <Boyuan.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Pass the vcn instance structure to these functions rather
than adev and the instance number.
TODO: clean up the function internals to use the vinst state
directly rather than accessing it indirectly via adev->vcn.inst[].
Reviewed-by: Boyuan Zhang <Boyuan.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Pass the vcn instance structure to these functions rather
than adev and the instance number.
TODO: clean up the function internals to use the vinst state
directly rather than accessing it indirectly via adev->vcn.inst[].
Reviewed-by: Boyuan Zhang <Boyuan.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Pass the vcn instance structure to these functions rather
than adev and the instance number.
TODO: clean up the function internals to use the vinst state
directly rather than accessing it indirectly via adev->vcn.inst[].
Reviewed-by: Boyuan Zhang <Boyuan.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Pass the vcn instance structure to these functions rather
than adev and the instance number.
TODO: clean up the function internals to use the vinst state
directly rather than accessing it indirectly via adev->vcn.inst[].
Reviewed-by: Boyuan Zhang <Boyuan.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Pass the vcn instance structure to these functions rather
than adev and the instance number.
TODO: clean up the function internals to use the vinst state
directly rather than accessing it indirectly via adev->vcn.inst[].
Reviewed-by: Boyuan Zhang <Boyuan.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Pass the vcn instance structure to these functions rather
than adev and the instance number.
TODO: clean up the function internals to use the vinst state
directly rather than accessing it indirectly via adev->vcn.inst[].
Reviewed-by: Boyuan Zhang <Boyuan.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Pass the vcn instance structure to these functions rather
than adev and the instance number.
TODO: clean up the function internals to use the vinst state
directly rather than accessing it indirectly via adev->vcn.inst[].
v2: index instances directly on vcn1.0 and 2.0 to make
it clear that they only support a single instance (Lijo)
Reviewed-by: Boyuan Zhang <Boyuan.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Pass the vcn instance structure to these functions rather
than adev and the instance number.
TODO: clean up the function internals to use the vinst state
directly rather than accessing it indirectly via adev->vcn.inst[].
Reviewed-by: Boyuan Zhang <Boyuan.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Pass the vcn instance structure to these functions rather
than adev and the instance number.
TODO: clean up the function internals to use the vinst state
directly rather than accessing it indirectly via adev->vcn.inst[].
Reviewed-by: Boyuan Zhang <Boyuan.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Move more per instance data into the per instance structure.
v2: index instances directly on vcn1.0 and 2.0 to make
it clear that they only support a single instance (Lijo)
v3: fix typo on vcn 2.5
Reviewed-by: Boyuan Zhang <Boyuan.Zhang@amd.com> (v2)
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Store it per instance so we can track it per instance.
v2: index instances directly on vcn1.0 and 2.0 to make
it clear that they only support a single instance (Lijo)
Reviewed-by: Boyuan Zhang <Boyuan.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Have a separate work handler for each VCN instance. This
paves the way for per instance VCN power gating at runtime.
v2: index instances directly on vcn1.0 and 2.0 to make
it clear that they only support a single instance (Lijo)
Reviewed-by: Boyuan Zhang <Boyuan.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Split the code on a per instance basis. This will allow
us to use the per instance functions in the future to
handle more things per instance.
Reviewed-by: Boyuan Zhang <Boyuan.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Split the code on a per instance basis. This will allow
us to use the per instance functions in the future to
handle more things per instance.
v2: squash in fix for stop() from Boyuan
Reviewed-by: Boyuan Zhang <Boyuan.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Split the code on a per instance basis. This will allow
us to use the per instance functions in the future to
handle more things per instance.
v2: squash in fix for stop() from Boyuan
Reviewed-by: Boyuan Zhang <Boyuan.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
