linux.git/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h, branch v7.2-rc2

drm/amdkfd: Let driver decide buffer size at AMDKFD_IOC_GET_DMABUF_INFO ioctl

2026-06-17T22:24:38+00:00

amdkfd driver needs allocate buffer to return bo metadata to user space. The
buffer size is controlled by user currently. It is a potential security issue
that hostile value (e.g. 2 GiB) lets any render-group user trigger order-MAX
allocation/OOM in kernel context.

This patch first finds bo metadata size. If the size is smaller than user
provided value drive can safely allocate buffer in kernel space and copy to
user space buffer. If not, driver will let user know, not allocate and copy.
User will redo with new buffer in user space.

This patch lets driver decide buffer allocation size to avoid potential hostile
size from user space.

Signed-off-by: Xiaogang Chen 
Reviewed-by: Alex Deucher 
Signed-off-by: Alex Deucher 
(cherry picked from commit f54ce9e8cbd3abe0eda3a285f54dc4f572fe589a)

drm/amdgpu: unmap all user mappings of framebuffer and doorbell before mode1 reset

2026-05-19T15:45:41+00:00

During Mode 1 reset, the ASIC undergoes a reset cycle and becomes temporarily
inaccessible via PCIe. Any attempt to access framebuffer or MMIO registers during
this window can result in uncompleted PCIe transactions, leading to NMI panics or
system hangs.

To prevent this, Unmap all of the applications mappings of the framebuffer
and doorbell BARs before mode1 reset. Also prevent new mappings from coming in
during the reset process.

v2: remove inode in kfd_dev (Christian)
v3: correct unmap offset (Felix), remove prevent new mappings part
to avoid deadlock (Christian)

Reviewed-by: Felix Kuehling 
Signed-off-by: Yifan Zhang 
Signed-off-by: Alex Deucher

drm/amdgpu: Move KFD sched stop/start into PTL control path

2026-05-11T19:55:56+00:00

Move amdgpu_amdkfd_stop/start_sched calls from kfd_ptl_control()
into amdgpu_ptl_perf_monitor_ctrl() so all PTL callers (KFD ioctl,
sysfs, GFX init) get consistent scheduling management.

Add amdgpu_amdkfd_stop/start_sched_all() wrappers to stop and
restart KFD scheduling on all nodes without assuming node ID ordering.

v3:
 * call start/stop for PTL Set Only
v2:
 * move the stop/start sched function to
   amdgpu_ptl_perf_monitor_ctrl(Lijo)
 * add wrapper amdgpu_amdkfd_stop_sched_all and
   amdgpu_amdkfd_start_sched_all (Lijo)

Signed-off-by: Perry Yuan 
Reviewed-by: Yifan Zhang 
Signed-off-by: Alex Deucher

drm/amdgpu: add psp interfaces for peak tops limiter driver

2026-05-11T19:55:55+00:00

Introduce a Peak Tops Limiter (PTL) driver that dynamically caps
engine frequency to ensure delivered TOPS never exceeds a defined
TOPS_limit. This initial implementation provides core data structures
and kernel-space interfaces (set/get, enable/disable) to manage PTL state.

PTL performs a firmware handshake to initialize its state and update
predefined format types. It supports updating these format types at
runtime while user-space tools automatically switch PTL state, and
also allows explicitly switching PTL state via newly added commands.

Signed-off-by: Perry Yuan 
Reviewed-by: Lijo Lazar 
Acked-by: Alex Deucher 
Signed-off-by: Alex Deucher

drm/amdkfd: Add domain parameter to alloc kernel BO

2026-01-14T19:28:59+00:00

To allocate kernel BO from VRAM domain for MQD in the following patch.
No functional change because kernel BO allocate all from GTT domain.

Rename amdgpu_amdkfd_alloc_gtt_mem to amdgpu_amdkfd_alloc_kernel_mem
Rename amdgpu_amdkfd_free_gtt_mem to amdgpu_amdkfd_free_kernel_mem
Rename mem_kfd_mem_obj gtt_mem to mem

Signed-off-by: Philip Yang 
Reviewed-by: Kent Russell 
Reviewed-by: Felix Kuehling 
Signed-off-by: Alex Deucher

drm/amdkfd: kfd driver supports hot unplug/replug amdgpu devices

2026-01-14T19:28:49+00:00

This patch allows kfd driver function correctly when AMD gpu devices got
unplug/replug at run time.

When an AMD gpu device got unplug kfd driver gracefully terminates existing
kfd processes after stops all queues by sending SIGBUS to user process. After
that user space can still use remaining AMD gpu devices. When all AMD gpu
devices at system got removed kfd driver will not response new requests.

Unplugged AMD gpu devices can be re-plugged. kfd driver will use added devices
to function as usual.

The purpose of this patch is having kfd driver behavior as expected during and
after AMD gpu devices unplug/replug at run time.

Signed-off-by: Xiaogang Chen 
Acked-by: Alex Deucher 
Signed-off-by: Alex Deucher

amdkfd: fence handler evict and restore a kfd process by its context id

2025-12-08T19:13:25+00:00

In fence enable signaling handler, kfd evicts
and restores the corresponding kfd_process,
this commit helps find the kfd_process by
both its mm and context id.

Signed-off-by: Zhu Lingshan 
Reviewed-by: Felix Kuehling 
Signed-off-by: Alex Deucher

amdkfd: record kfd context id in amdkfd_fence

2025-12-08T19:13:23+00:00

This commit records the context id of the
cooresponding kfd process in amdkfd_fence

Signed-off-by: Zhu Lingshan 
Reviewed-by: Felix Kuehling 
Signed-off-by: Alex Deucher

amdkfd: record kfd context id into kfd process_info

2025-12-08T18:56:43+00:00

This commit records the context id of the owner
kfd_process into a kfd process_info when
create it.

Signed-off-by: Zhu Lingshan 
Reviewed-by: Felix Kuehling 
Signed-off-by: Alex Deucher

drm/amdgpu: reduce the full gpu access time in amdgpu_device_init.

2025-12-08T18:56:38+00:00

[Why]
function "devm_memremap_pages" in function "kgd2kfd_init_zone_device",
sometimes cost too much time.

[How]
move the function "kgd2kfd_init_zone_device"
after release full gpu access(amdgpu_virt_release_full_gpu).

v2:
improve the coding style.

Signed-off-by: chong li 
Reviewed-by: Emily Deng 
Signed-off-by: Alex Deucher