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drm/amdkfd: don't allow mapping the MMIO HDP page with large pages 

commit be4a2a81b6 upstream.

We don't get the right offset in that case.  The GPU has
an unused 4K area of the register BAR space into which you can
remap registers.  We remap the HDP flush registers into this
space to allow userspace (CPU or GPU) to flush the HDP when it
updates VRAM.  However, on systems with >4K pages, we end up
exposing PAGE_SIZE of MMIO space.

Fixes: d8e408a827 ("drm/amdkfd: Expose HDP registers to user space")
Reviewed-by: Felix Kuehling <felix.kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alex Deucher 2024-04-14 13:06:39 -04:00 committed by Greg Kroah-Hartman
parent c42a8c6baa
commit 89fffbdf53
1 changed files with 5 additions and 2 deletions
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7
drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
View File

@ -1106,7 +1106,7 @@ static int kfd_ioctl_alloc_memory_of_gpu(struct file *filep,
goto err_unlock;
}
offset = dev->adev->rmmio_remap.bus_addr;
if (!offset) {
if (!offset || (PAGE_SIZE > 4096)) {
err = -ENOMEM;
goto err_unlock;
}
@ -2215,7 +2215,7 @@ static int criu_restore_memory_of_gpu(struct kfd_process_device *pdd,
return -EINVAL;
}
offset = pdd->dev->adev->rmmio_remap.bus_addr;
if (!offset) {
if (!offset || (PAGE_SIZE > 4096)) {
pr_err("amdgpu_amdkfd_get_mmio_remap_phys_addr failed\n");
return -ENOMEM;
}
@ -2886,6 +2886,9 @@ static int kfd_mmio_mmap(struct kfd_dev *dev, struct kfd_process *process,
if (vma->vm_end - vma->vm_start != PAGE_SIZE)
return -EINVAL;
if (PAGE_SIZE > 4096)
return -EINVAL;
address = dev->adev->rmmio_remap.bus_addr;
vma->vm_flags |= VM_IO | VM_DONTCOPY | VM_DONTEXPAND | VM_NORESERVE |