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git://nv-tegra.nvidia.com/linux-nvgpu.git
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d8a9b899f4
Move the code involved in nvlink probe sequence into a separate unit called "nvlink_probe" nvlink probe code is spread over both the common and OS specific nvlink files. Nvlink Probe unit would encompass code needed to initialize the nvlink software state. Nvlink software initialization involves: 1. Allocate memory for nvlink_device and nvlink_link structs 2. Read the device tree pci node to know about nvlink topology 3. Initialize nvlink function pointers needed by Tegra nvlink core-driver 4. Register nvlink_device and nvlink_link with the core-driver. nvlink probe returns -ENODEV when nvlink is not supported. Nvlink is not supported in two cases: 1. There is no nvlink IP on the Tegra SoC which is denoted by CONFIG_TEGRA_NVLINK or 2. The pci device tree node does not have "nvidia,nvlink" child node needed to describe nvlink topology. Any negative return value other than -ENODEV denotes failure in execution of nvlink probe. JIRA NVGPU-1783 Change-Id: I50011b25d88d8cc01569caac7895abe32ee38215 Signed-off-by: Tejal Kudav <tkudav@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/1994619 Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com> Reviewed-by: svc-mobile-misra <svc-mobile-misra@nvidia.com> GVS: Gerrit_Virtual_Submit Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com> Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com> Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
74 lines
2.1 KiB
C
74 lines
2.1 KiB
C
/*
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* Copyright (c) 2019, NVIDIA CORPORATION. All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#include <nvgpu/gk20a.h>
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#include <nvgpu/enabled.h>
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#include <nvgpu/nvlink_probe.h>
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int nvgpu_nvlink_probe(struct gk20a *g)
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{
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#ifdef CONFIG_TEGRA_NVLINK
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int err;
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err = nvgpu_nvlink_setup_ndev(g);
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if (err != 0)
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return err;
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err = nvgpu_nvlink_read_dt_props(g);
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if (err != 0)
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goto free_ndev;
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err = nvgpu_nvlink_init_ops(g);
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if (err != 0)
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goto free_ndev;
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/* Register device with core driver*/
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err = nvgpu_nvlink_register_device(g);
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if (err != 0) {
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nvgpu_err(g, "failed on nvlink device registration");
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goto free_ndev;
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}
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/* Register link with core driver */
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err = nvgpu_nvlink_register_link(g);
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if (err != 0) {
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nvgpu_err(g, "failed on nvlink link registration");
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goto unregister_ndev;
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}
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/* Enable NVLINK support */
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nvgpu_set_enabled(g, NVGPU_SUPPORT_NVLINK, true);
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return 0;
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unregister_ndev:
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nvgpu_nvlink_unregister_device(g);
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free_ndev:
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nvgpu_kfree(g, g->nvlink.priv);
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g->nvlink.priv = NULL;
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return err;
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#else
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return -ENODEV;
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#endif
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}
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