gpu: nvgpu: gk20a: Allow regops lists longer than 128

Process long regops lists in 4-kB fragments, overcoming the overly
low limit of 128 reg ops per IOCTL call. Bump the list limit to 1024
and report the limit in GPU characteristics.

Bug 200248726

Change-Id: I3ad49139409f32aea8b1226d6562e88edccc8053
Signed-off-by: Sami Kiminki <skiminki@nvidia.com>
Reviewed-on: http://git-master/r/1253716
(cherry picked from commit 22314619b28f52610cb8769cd4c3f9eb01904eab)
Reviewed-on: http://git-master/r/1266652
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/include/uapi/linux/nvgpu.h b/include/uapi/linux/nvgpu.h
index 052bebc8..e844a205 100644
--- a/include/uapi/linux/nvgpu.h
+++ b/include/uapi/linux/nvgpu.h
@@ -220,6 +220,11 @@ struct nvgpu_gpu_characteristics {
         __u8  vbios_oem_version;
         __u32 vbios_version;
 
+        /* NVGPU_DBG_GPU_IOCTL_REG_OPS: the upper limit for the number
+         * of regops */
+        __u32 reg_ops_limit;
+        __u32 reserved1;
+
         /* Notes:
            - This struct can be safely appended with new fields. However, always
              keep the structure size multiple of 8 and make sure that the binary