Quoting Abdiel Janulgue (2019-12-12 11:34:38)
> Fault handler to handle missing pages for lmem objects.
>
> v3: Add get_vm_cpu_ops, iterate over all memory regions in the
> lmem selftest, use remap_io_mapping.
>
> Signed-off-by: Abdiel Janulgue <abdiel.janulgue@xxxxxxxxxxxxxxx>
> Signed-off-by: Matthew Auld <matthew.auld@xxxxxxxxx>
> Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/gem/i915_gem_lmem.c | 40 +++++
> drivers/gpu/drm/i915/gem/i915_gem_lmem.h | 6 +
> drivers/gpu/drm/i915/gem/i915_gem_mman.c | 32 +++-
> drivers/gpu/drm/i915/gem/i915_gem_mman.h | 1 +
> .../drm/i915/gem/selftests/i915_gem_mman.c | 137 +++++++++++++++---
> 5 files changed, 188 insertions(+), 28 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_lmem.c b/drivers/gpu/drm/i915/gem/i915_gem_lmem.c
> index 0e2bf6b7e143..bbe625935005 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_lmem.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_lmem.c
> @@ -6,8 +6,36 @@
> #include "intel_memory_region.h"
> #include "gem/i915_gem_region.h"
> #include "gem/i915_gem_lmem.h"
> +#include "gem/i915_gem_mman.h"
> #include "i915_drv.h"
>
> +vm_fault_t vm_fault_iomem(struct vm_fault *vmf)
> +{
> + struct vm_area_struct *area = vmf->vma;
> + struct i915_mmap_offset *priv = area->vm_private_data;
> + struct drm_i915_gem_object *obj = priv->obj;
> + struct intel_memory_region *mem = obj->mm.region;
> + unsigned long size = area->vm_end - area->vm_start;
> + bool write = area->vm_flags & VM_WRITE;
> + int ret;
> +
> + /* Sanity check that we allow writing into this object */
> + if (i915_gem_object_is_readonly(obj) && write)
> + return VM_FAULT_SIGBUS;
> +
> + ret = i915_gem_object_pin_pages(obj);
> + if (ret)
> + return i915_error_to_vmf_fault(ret);
> +
> + ret = remap_io_mapping(area, area->vm_start,
> + i915_gem_object_lmem_io_pfn(obj, 0), size,
> + &mem->iomap);
So this implementation only works with contiguous objects, right?
if (GEM_WARN_ON(obj_noncontiguous(obj)))
return VM_FAULT_SIGBUS;
I think for future awareness.
-Chris
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