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, 8 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/nvgpu_common.c b/drivers/gpu/nvgpu/nvgpu_common.c
index 179464d8..a1f4832b 100644
--- a/drivers/gpu/nvgpu/nvgpu_common.c
+++ b/drivers/gpu/nvgpu/nvgpu_common.c
@@ -155,6 +155,14 @@ int nvgpu_probe(struct gk20a *g,
         gk20a_create_sysfs(g->dev);
         gk20a_debug_init(g->dev, debugfs_symlink);
 
+        g->dbg_regops_tmp_buf = kzalloc(SZ_4K, GFP_KERNEL);
+        if (!g->dbg_regops_tmp_buf) {
+                dev_err(g->dev, "couldn't allocate regops tmp buf");
+                return -ENOMEM;
+        }
+        g->dbg_regops_tmp_buf_ops =
+                SZ_4K / sizeof(g->dbg_regops_tmp_buf[0]);
+
         g->remove_support = gk20a_remove_support;
 
         return 0;