• Philip Yang's avatar
    drm/amdkfd: register svm range · 42de677f
    Philip Yang authored
    svm range structure stores the range start address, size, attributes,
    flags, prefetch location and gpu bitmap which indicates which GPU this
    range maps to. Same virtual address is shared by CPU and GPUs.
    Process has svm range list which uses both interval tree and list to
    store all svm ranges registered by the process. Interval tree is used by
    GPU vm fault handler and CPU page fault handler to get svm range
    structure from the specific address. List is used to scan all ranges in
    eviction restore work.
    No overlap range interval [start, last] exist in svms object interval
    tree. If process registers new range which has overlap with old range,
    the old range split into 2 ranges depending on the overlap happens at
    head or tail part of old range.
    Apply attributes preferred location, prefetch location, mapping flags,
    migration granularity to svm range, store mapping gpu index into bitmap.
    Signed-off-by: default avatarPhilip Yang <Philip.Yang@amd.com>
    Signed-off-by: default avatarAlex Sierra <alex.sierra@amd.com>
    Reviewed-by: default avatarFelix Kuehling <Felix.Kuehling@amd.com>
    Signed-off-by: default avatarFelix Kuehling <Felix.Kuehling@amd.com>
    Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>