gpu: nvgpu: add igpu support for clk_arbiter.

This patch constructs clk_arbiter specific code for gp10b as well as
gv11b and does the necessary plumbing in the clk_arbiter code. The
changes made are as follows.

1) Constructed clk_arb_gp10b.* files which add support for clk_arb
related HALS including the nvgpu_clk_arb_init and nvgpu_clk_arb_cb.
This doesn't have support for debugfs nor the VFUpdateEvent yet and
consequently no support for arb->notifications.

2) Added gpcclk specific variables corresponding to every gpc2clk in
a given clk_arb related struct.

3) Linux specific support_clk_freq_controller is assigned true in
platform_gp10b.c and platform_gv11b.c files.

4) Incremented the clk_arb_worker.put atomic variable during
worker_deinit so as to allow the worker thread to be stopped.

5) Added the flag clk_arb_events_supported as part of struct
nvgpu_clk_arb. This flag is used to selectively account for the extra
refcounting present in OS specific code i.e.
nvgpu_clk_arb_commit_request_fd. For igpus, the extra refcount is
reduced during nvgpu_clk_arb_release_completion_dev.

Bug 2061372

Change-Id: Id00acb106db2b46e55aa0324034a16a73723c078
Signed-off-by: Debarshi Dutta <ddutta@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1774281
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

3 files changed, 15 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/os/linux/ioctl_clk_arb.c b/drivers/gpu/nvgpu/os/linux/ioctl_clk_arb.c
index 501b5f93..2d9946b1 100644
--- a/drivers/gpu/nvgpu/os/linux/ioctl_clk_arb.c
+++ b/drivers/gpu/nvgpu/os/linux/ioctl_clk_arb.c
@@ -55,6 +55,13 @@ static int nvgpu_clk_arb_release_completion_dev(struct inode *inode,
 
         clk_arb_dbg(session->g, " ");
 
+        /* This is done to account for the extra refcount taken in
+         * nvgpu_clk_arb_commit_request_fd without events support in iGPU
+         */
+        if (!session->g->clk_arb->clk_arb_events_supported) {
+                nvgpu_ref_put(&dev->refcount, nvgpu_clk_arb_free_fd);
+        }
+
         nvgpu_ref_put(&session->refcount, nvgpu_clk_arb_free_session);
         nvgpu_ref_put(&dev->refcount, nvgpu_clk_arb_free_fd);
         return 0;
@@ -425,6 +432,10 @@ int nvgpu_clk_arb_commit_request_fd(struct gk20a *g,
                 err = -EINVAL;
                 goto fdput_fd;
         }
+
+        clk_arb_dbg(g, "requested target = %u\n",
+                (u32)dev->gpc2clk_target_mhz);
+
         nvgpu_ref_get(&dev->refcount);
         nvgpu_spinlock_acquire(&session->session_lock);
         nvgpu_list_add(&dev->node, &session->targets);
diff --git a/drivers/gpu/nvgpu/os/linux/platform_gp10b_tegra.c b/drivers/gpu/nvgpu/os/linux/platform_gp10b_tegra.c
index 5fdcb05c..a792bfcb 100644
--- a/drivers/gpu/nvgpu/os/linux/platform_gp10b_tegra.c
+++ b/drivers/gpu/nvgpu/os/linux/platform_gp10b_tegra.c
@@ -171,6 +171,8 @@ static int gp10b_tegra_probe(struct device *dev)
 
         nvgpu_mutex_init(&platform->clk_get_freq_lock);
 
+        platform->g->ops.clk.support_clk_freq_controller = true;
+
         return 0;
 }
 
diff --git a/drivers/gpu/nvgpu/os/linux/platform_gv11b_tegra.c b/drivers/gpu/nvgpu/os/linux/platform_gv11b_tegra.c
index b055eb6e..ec93b4c3 100644
--- a/drivers/gpu/nvgpu/os/linux/platform_gv11b_tegra.c
+++ b/drivers/gpu/nvgpu/os/linux/platform_gv11b_tegra.c
@@ -99,6 +99,8 @@ static int gv11b_tegra_probe(struct device *dev)
 
         nvgpu_mutex_init(&platform->clk_get_freq_lock);
 
+        platform->g->ops.clk.support_clk_freq_controller = true;
+
         return 0;
 }