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, 4 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/gk20a.c b/drivers/gpu/nvgpu/gk20a/gk20a.c
index e314d6cd..ca2f7b33 100644
--- a/drivers/gpu/nvgpu/gk20a/gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/gk20a.c
@@ -700,6 +700,8 @@ void gk20a_remove_support(struct device *dev)
 #ifdef CONFIG_TEGRA_COMMON
         tegra_unregister_idle_unidle();
 #endif
+        if (g->dbg_regops_tmp_buf)
+                kfree(g->dbg_regops_tmp_buf);
 
         if (g->pmu.remove_support)
                 g->pmu.remove_support(&g->pmu);
@@ -2170,6 +2172,8 @@ int gk20a_init_gpu_characteristics(struct gk20a *g)
         gpu->pci_class = g->pci_class;
         gpu->pci_revision = g->pci_revision;
 
+        gpu->reg_ops_limit = 1024;
+
         return 0;
 }