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This adds new IOCTL that provides information for the userspace for GPU characterization. Specifically, the following items are provided: GPU arch/impl/rev, number of GPCs, L2 cache size, on-board video memory size, num of tpc:s per gpc, and bus type. The primary user of the new IOCTL will be rmapi_tegra. Bug 1392902 Change-Id: Ia7c25c83c8a07821ec60be3edd018c6e0894df0f Reviewed-on: http://git-master/r/346379 (cherry picked from commit 0b9ceca5a06d07cc8d281a92b76ebef8d4da0c92) Reviewed-on: http://git-master/r/350658 Reviewed-by: Sami Kiminki <skiminki@nvidia.com> Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com> Tested-by: Terje Bergstrom <tbergstrom@nvidia.com> Signed-off-by: Sami Kiminki <skiminki@nvidia.com>