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, 11 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/vgpu/vgpu.c b/drivers/gpu/nvgpu/vgpu/vgpu.c
index bd332583..213f6bbb 100644
--- a/drivers/gpu/nvgpu/vgpu/vgpu.c
+++ b/drivers/gpu/nvgpu/vgpu/vgpu.c
@@ -191,6 +191,9 @@ static void vgpu_remove_support(struct device *dev)
         struct tegra_vgpu_intr_msg msg;
         int err;
 
+        if (g->dbg_regops_tmp_buf)
+                kfree(g->dbg_regops_tmp_buf);
+
         if (g->pmu.remove_support)
                 g->pmu.remove_support(&g->pmu);
 
@@ -242,6 +245,14 @@ static int vgpu_init_support(struct platform_device *pdev)
         mutex_init(&g->client_lock);
         mutex_init(&g->ch_wdt_lock);
 
+        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 = vgpu_remove_support;
         return 0;