cregit-Linux how code gets into the kernel

Release 4.11 drivers/gpu/drm/nouveau/nvkm/subdev/pci/pcie.c

/*
 * Copyright 2015 Karol Herbst <nouveau@karolherbst.de>
 *
 * 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 COPYRIGHT HOLDER(S) OR AUTHOR(S) 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.
 *
 * Authors: Karol Herbst <git@karolherbst.de>
 */
#include "priv.h"


static char *nvkm_pcie_speeds[] = {
	"2.5GT/s",
	"5.0GT/s",
	"8.0GT/s",
};


static enum nvkm_pcie_speed nvkm_pcie_speed(enum pci_bus_speed speed) { switch (speed) { case PCIE_SPEED_2_5GT: return NVKM_PCIE_SPEED_2_5; case PCIE_SPEED_5_0GT: return NVKM_PCIE_SPEED_5_0; case PCIE_SPEED_8_0GT: return NVKM_PCIE_SPEED_8_0; default: /* XXX 0x16 is 8_0, assume 0x17 will be 16_0 for now */ if (speed == 0x17) return NVKM_PCIE_SPEED_8_0; return -1; } }

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static int nvkm_pcie_get_version(struct nvkm_pci *pci) { if (!pci->func->pcie.version) return -ENOSYS; return pci->func->pcie.version(pci); }

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Karol Herbst38100.00%1100.00%
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static int nvkm_pcie_get_max_version(struct nvkm_pci *pci) { if (!pci->func->pcie.version_supported) return -ENOSYS; return pci->func->pcie.version_supported(pci); }

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Karol Herbst38100.00%1100.00%
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static int nvkm_pcie_set_version(struct nvkm_pci *pci, int version) { if (!pci->func->pcie.set_version) return -ENOSYS; nvkm_trace(&pci->subdev, "set to version %i\n", version); pci->func->pcie.set_version(pci, version); return nvkm_pcie_get_version(pci); }

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Karol Herbst60100.00%1100.00%
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int nvkm_pcie_oneinit(struct nvkm_pci *pci) { if (pci->func->pcie.max_speed) nvkm_debug(&pci->subdev, "pcie max speed: %s\n", nvkm_pcie_speeds[pci->func->pcie.max_speed(pci)]); return 0; }

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Karol Herbst47100.00%1100.00%
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int nvkm_pcie_init(struct nvkm_pci *pci) { struct nvkm_subdev *subdev = &pci->subdev; int ret; /* raise pcie version first */ ret = nvkm_pcie_get_version(pci); if (ret > 0) { int max_version = nvkm_pcie_get_max_version(pci); if (max_version > 0 && max_version > ret) ret = nvkm_pcie_set_version(pci, max_version); if (ret < max_version) nvkm_error(subdev, "couldn't raise version: %i\n", ret); } if (pci->func->pcie.init) pci->func->pcie.init(pci); if (pci->pcie.speed != -1) nvkm_pcie_set_link(pci, pci->pcie.speed, pci->pcie.width); return 0; }

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Karol Herbst133100.00%1100.00%
Total133100.00%1100.00%


int nvkm_pcie_set_link(struct nvkm_pci *pci, enum nvkm_pcie_speed speed, u8 width) { struct nvkm_subdev *subdev = &pci->subdev; enum nvkm_pcie_speed cur_speed, max_speed; struct pci_bus *pbus; int ret; if (!pci || !pci_is_pcie(pci->pdev)) return 0; pbus = pci->pdev->bus; if (!pci->func->pcie.set_link) return -ENOSYS; nvkm_trace(subdev, "requested %s\n", nvkm_pcie_speeds[speed]); if (pci->func->pcie.version(pci) < 2) { nvkm_error(subdev, "setting link failed due to low version\n"); return -ENODEV; } cur_speed = pci->func->pcie.cur_speed(pci); max_speed = min(nvkm_pcie_speed(pbus->max_bus_speed), pci->func->pcie.max_speed(pci)); nvkm_trace(subdev, "current speed: %s\n", nvkm_pcie_speeds[cur_speed]); if (speed > max_speed) { nvkm_debug(subdev, "%s not supported by bus or card, dropping" "requested speed to %s", nvkm_pcie_speeds[speed], nvkm_pcie_speeds[max_speed]); speed = max_speed; } pci->pcie.speed = speed; pci->pcie.width = width; if (speed == cur_speed) { nvkm_debug(subdev, "requested matches current speed\n"); return speed; } nvkm_debug(subdev, "set link to %s x%i\n", nvkm_pcie_speeds[speed], width); ret = pci->func->pcie.set_link(pci, speed, width); if (ret < 0) nvkm_error(subdev, "setting link failed: %i\n", ret); return ret; }

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Karol Herbst281100.00%2100.00%
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Karol Herbst665100.00%2100.00%
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