From c4bb19d46e1c9121a0948fa506098cbf2f64e2a6 Mon Sep 17 00:00:00 2001 From: David Nieto Date: Fri, 7 Oct 2016 16:25:04 -0700 Subject: nvgpu: gpu: arbiter for vf switch management JIRA DNVGPU-143 The arbiter is charged with selecting the proper frequencies when multiple applications submit simultaneously clock change requests On the current implementation, the arbiter guarantees that the selected frequency will be always higher or equal to the request, as long as the request is in range. The current code is not yet realtime friendly, as requests are not pre-allocated. Summary of changes: (1) pstate/vf switch no longer selects boot frequency (2) changed mclk code change to accept input freq (3) added arbiter (4) now a single session can submit concurrent requests the last request is the one that applies for that session (5) modified locking mechanism to reduce lock contention (6) Added callback to notify the arbiter that the VF table has changed and is no longer valid (PMU/Thermals must call this when VF table is invalid) (7) changed internal API to work with MHz (8) added debugfs for stats Change-Id: I6a7b05c9447761e8536f84ef86b5ab0793164d63 Signed-off-by: David Nieto Reviewed-on: http://git-master/r/1239461 Reviewed-by: Thomas Fleury GVS: Gerrit_Virtual_Submit Reviewed-by: Terje Bergstrom Reviewed-on: http://git-master/r/1267120 Reviewed-by: Automatic_Commit_Validation_User --- drivers/gpu/nvgpu/gp106/clk_arb_gp106.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) (limited to 'drivers/gpu/nvgpu/gp106/clk_arb_gp106.c') diff --git a/drivers/gpu/nvgpu/gp106/clk_arb_gp106.c b/drivers/gpu/nvgpu/gp106/clk_arb_gp106.c index 112cb588..d1cbb32b 100644 --- a/drivers/gpu/nvgpu/gp106/clk_arb_gp106.c +++ b/drivers/gpu/nvgpu/gp106/clk_arb_gp106.c @@ -23,7 +23,7 @@ static u32 gp106_get_arbiter_clk_domains(struct gk20a *g) } static int gp106_get_arbiter_clk_range(struct gk20a *g, u32 api_domain, - u64 *min_hz, u64 *max_hz) + u16 *min_mhz, u16 *max_mhz) { enum nv_pmu_clk_clkwhich clkwhich; struct clk_set_info *p0_info; @@ -52,14 +52,14 @@ static int gp106_get_arbiter_clk_range(struct gk20a *g, u32 api_domain, if (!p0_info) return -EINVAL; - *min_hz = (u64)(p5_info->min_mhz) * (u64)MHZ; - *max_hz = (u64)(p0_info->max_mhz) * (u64)MHZ; + *min_mhz = p5_info->min_mhz; + *max_mhz = p0_info->max_mhz; return 0; } static int gp106_get_arbiter_clk_default(struct gk20a *g, u32 api_domain, - u64 *default_hz) + u16 *default_mhz) { enum nv_pmu_clk_clkwhich clkwhich; struct clk_set_info *p0_info; @@ -82,7 +82,7 @@ static int gp106_get_arbiter_clk_default(struct gk20a *g, u32 api_domain, if (!p0_info) return -EINVAL; - *default_hz = (u64)p0_info->max_mhz * (u64)MHZ; + *default_mhz = p0_info->max_mhz; return 0; } -- cgit v1.2.2