gpu: nvgpu: Userspace POSIX support

Add support for compiling nvgpu in a POSIX compliant userspace.
This code adds all of the necessary abstraction interfaces (mostly
stubbed) to enabled extremely limited and basic functionality in
nvgpu.

The goal of this code is to facilitate unit testing of the nvgpu
common core. By doing this in userspace it is much easier to write
tests that rely on very particular states within nvgpu since a user
can very precisely control the state of nvgpu.

JIRA NVGPU-525

Change-Id: I30e95016df14997d951075777e0585f912dc5960
Signed-off-by: Alex Waterman <alexw@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1683914
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 148 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/common/posix/clk_arb.c b/drivers/gpu/nvgpu/common/posix/clk_arb.c
new file mode 100644
index 00000000..f41383cd
--- /dev/null
+++ b/drivers/gpu/nvgpu/common/posix/clk_arb.c
@@ -0,0 +1,148 @@
+/*
+ * Copyright (c) 2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <nvgpu/clk_arb.h>
+
+/**
+ * Stub imlementation of the clk_arb code. Yikes. Much of this probably could be
+ * commonized if one were to think through the implementation but that is
+ * probably weeks of work at a minimum.
+ *
+ * So for POSIX it will be stubbed.
+ */
+
+int nvgpu_clk_arb_init_arbiter(struct gk20a *g)
+{
+        return -ENOSYS;
+}
+
+int nvgpu_clk_arb_get_arbiter_clk_range(struct gk20a *g, u32 api_domain,
+                                        u16 *min_mhz, u16 *max_mhz)
+{
+        return -ENOSYS;
+}
+
+int nvgpu_clk_arb_get_arbiter_actual_mhz(struct gk20a *g,
+                                         u32 api_domain, u16 *actual_mhz)
+{
+        return -ENOSYS;
+}
+
+int nvgpu_clk_arb_get_arbiter_effective_mhz(struct gk20a *g,
+                                            u32 api_domain, u16 *effective_mhz)
+{
+        return -ENOSYS;
+}
+
+
+int nvgpu_clk_arb_get_arbiter_clk_f_points(struct gk20a *g,
+                                           u32 api_domain,
+                                           u32 *max_points, u16 *fpoints)
+{
+        return -ENOSYS;
+}
+
+u32 nvgpu_clk_arb_get_arbiter_clk_domains(struct gk20a *g)
+{
+        return 0;
+}
+
+bool nvgpu_clk_arb_is_valid_domain(struct gk20a *g, u32 api_domain)
+{
+        return false;
+}
+
+void nvgpu_clk_arb_cleanup_arbiter(struct gk20a *g)
+{
+}
+
+int nvgpu_clk_arb_install_session_fd(struct gk20a *g,
+                                     struct nvgpu_clk_session *session)
+{
+        return -ENOSYS;
+}
+
+
+int nvgpu_clk_arb_init_session(struct gk20a *g,
+                               struct nvgpu_clk_session **_session)
+{
+        return -ENOSYS;
+}
+
+void nvgpu_clk_arb_release_session(struct gk20a *g,
+                                   struct nvgpu_clk_session *session)
+{
+}
+
+int nvgpu_clk_arb_commit_request_fd(struct gk20a *g,
+                                    struct nvgpu_clk_session *session,
+                                    int request_fd)
+{
+        return -ENOSYS;
+}
+
+int nvgpu_clk_arb_set_session_target_mhz(struct nvgpu_clk_session *session,
+                                         int fd, u32 api_domain, u16 target_mhz)
+{
+        return -ENOSYS;
+}
+
+int nvgpu_clk_arb_get_session_target_mhz(struct nvgpu_clk_session *session,
+                                         u32 api_domain, u16 *target_mhz)
+{
+        return -ENOSYS;
+}
+
+int nvgpu_clk_arb_install_event_fd(struct gk20a *g,
+                                   struct nvgpu_clk_session *session,
+                                   int *event_fd, u32 alarm_mask)
+{
+        return -ENOSYS;
+}
+
+int nvgpu_clk_arb_install_request_fd(struct gk20a *g,
+                                     struct nvgpu_clk_session *session,
+                                     int *event_fd)
+{
+        return -ENOSYS;
+}
+
+void nvgpu_clk_arb_schedule_vf_table_update(struct gk20a *g)
+{
+}
+
+int nvgpu_clk_arb_get_current_pstate(struct gk20a *g)
+{
+        return -ENOSYS;
+}
+
+void nvgpu_clk_arb_pstate_change_lock(struct gk20a *g, bool lock)
+{
+}
+
+void nvgpu_clk_arb_send_thermal_alarm(struct gk20a *g)
+{
+}
+
+void nvgpu_clk_arb_schedule_alarm(struct gk20a *g, u32 alarm)
+{
+}