cregit-Linux how code gets into the kernel

Release 4.11 drivers/gpu/drm/nouveau/nvkm/subdev/mxm/base.c

/*
 * Copyright 2011 Red Hat Inc.
 *
 * 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: Ben Skeggs
 */
#include "mxms.h"

#include <core/option.h>
#include <subdev/bios.h>
#include <subdev/bios/mxm.h>
#include <subdev/i2c.h>


static bool mxm_shadow_rom_fetch(struct nvkm_i2c_bus *bus, u8 addr, u8 offset, u8 size, u8 *data) { struct i2c_msg msgs[] = { { .addr = addr, .flags = 0, .len = 1, .buf = &offset }, { .addr = addr, .flags = I2C_M_RD, .len = size, .buf = data, }, }; return i2c_transfer(&bus->i2c, msgs, 2) == 2; }

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static bool mxm_shadow_rom(struct nvkm_mxm *mxm, u8 version) { struct nvkm_device *device = mxm->subdev.device; struct nvkm_bios *bios = device->bios; struct nvkm_i2c *i2c = device->i2c; struct nvkm_i2c_bus *bus = NULL; u8 i2cidx, mxms[6], addr, size; i2cidx = mxm_ddc_map(bios, 1 /* LVDS_DDC */) & 0x0f; if (i2cidx < 0x0f) bus = nvkm_i2c_bus_find(i2c, i2cidx); if (!bus) return false; addr = 0x54; if (!mxm_shadow_rom_fetch(bus, addr, 0, 6, mxms)) { addr = 0x56; if (!mxm_shadow_rom_fetch(bus, addr, 0, 6, mxms)) return false; } mxm->mxms = mxms; size = mxms_headerlen(mxm) + mxms_structlen(mxm); mxm->mxms = kmalloc(size, GFP_KERNEL); if (mxm->mxms && mxm_shadow_rom_fetch(bus, addr, 0, size, mxm->mxms)) return true; kfree(mxm->mxms); mxm->mxms = NULL; return false; }

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#if defined(CONFIG_ACPI)
static bool mxm_shadow_dsm(struct nvkm_mxm *mxm, u8 version) { struct nvkm_subdev *subdev = &mxm->subdev; struct nvkm_device *device = subdev->device; static char muid[] = { 0x00, 0xA4, 0x04, 0x40, 0x7D, 0x91, 0xF2, 0x4C, 0xB8, 0x9C, 0x79, 0xB6, 0x2F, 0xD5, 0x56, 0x65 }; u32 mxms_args[] = { 0x00000000 }; union acpi_object argv4 = { .buffer.type = ACPI_TYPE_BUFFER, .buffer.length = sizeof(mxms_args), .buffer.pointer = (char *)mxms_args, }; union acpi_object *obj; acpi_handle handle; int rev; handle = ACPI_HANDLE(device->dev); if (!handle) return false; /* * spec says this can be zero to mean "highest revision", but * of course there's at least one bios out there which fails * unless you pass in exactly the version it supports.. */ rev = (version & 0xf0) << 4 | (version & 0x0f); obj = acpi_evaluate_dsm(handle, muid, rev, 0x00000010, &argv4); if (!obj) { nvkm_debug(subdev, "DSM MXMS failed\n"); return false; } if (obj->type == ACPI_TYPE_BUFFER) { mxm->mxms = kmemdup(obj->buffer.pointer, obj->buffer.length, GFP_KERNEL); } else if (obj->type == ACPI_TYPE_INTEGER) { nvkm_debug(subdev, "DSM MXMS returned 0x%llx\n", obj->integer.value); } ACPI_FREE(obj); return mxm->mxms != NULL; }

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#endif #if defined(CONFIG_ACPI_WMI) || defined(CONFIG_ACPI_WMI_MODULE) #define WMI_WMMX_GUID "F6CB5C3C-9CAE-4EBD-B577-931EA32A2CC0"
static u8 wmi_wmmx_mxmi(struct nvkm_mxm *mxm, u8 version) { struct nvkm_subdev *subdev = &mxm->subdev; u32 mxmi_args[] = { 0x494D584D /* MXMI */, version, 0 }; struct acpi_buffer args = { sizeof(mxmi_args), mxmi_args }; struct acpi_buffer retn = { ACPI_ALLOCATE_BUFFER, NULL }; union acpi_object *obj; acpi_status status; status = wmi_evaluate_method(WMI_WMMX_GUID, 0, 0, &args, &retn); if (ACPI_FAILURE(status)) { nvkm_debug(subdev, "WMMX MXMI returned %d\n", status); return 0x00; } obj = retn.pointer; if (obj->type == ACPI_TYPE_INTEGER) { version = obj->integer.value; nvkm_debug(subdev, "WMMX MXMI version %d.%d\n", (version >> 4), version & 0x0f); } else { version = 0; nvkm_debug(subdev, "WMMX MXMI returned non-integer\n"); } kfree(obj); return version; }

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static bool mxm_shadow_wmi(struct nvkm_mxm *mxm, u8 version) { struct nvkm_subdev *subdev = &mxm->subdev; u32 mxms_args[] = { 0x534D584D /* MXMS */, version, 0 }; struct acpi_buffer args = { sizeof(mxms_args), mxms_args }; struct acpi_buffer retn = { ACPI_ALLOCATE_BUFFER, NULL }; union acpi_object *obj; acpi_status status; if (!wmi_has_guid(WMI_WMMX_GUID)) { nvkm_debug(subdev, "WMMX GUID not found\n"); return false; } mxms_args[1] = wmi_wmmx_mxmi(mxm, 0x00); if (!mxms_args[1]) mxms_args[1] = wmi_wmmx_mxmi(mxm, version); if (!mxms_args[1]) return false; status = wmi_evaluate_method(WMI_WMMX_GUID, 0, 0, &args, &retn); if (ACPI_FAILURE(status)) { nvkm_debug(subdev, "WMMX MXMS returned %d\n", status); return false; } obj = retn.pointer; if (obj->type == ACPI_TYPE_BUFFER) { mxm->mxms = kmemdup(obj->buffer.pointer, obj->buffer.length, GFP_KERNEL); } kfree(obj); return mxm->mxms != NULL; }

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Ben Skeggs218100.00%3100.00%
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#endif static struct mxm_shadow_h { const char *name; bool (*exec)(struct nvkm_mxm *, u8 version); } _mxm_shadow[] = { { "ROM", mxm_shadow_rom }, #if defined(CONFIG_ACPI) { "DSM", mxm_shadow_dsm }, #endif #if defined(CONFIG_ACPI_WMI) || defined(CONFIG_ACPI_WMI_MODULE) { "WMI", mxm_shadow_wmi }, #endif {} };
static int mxm_shadow(struct nvkm_mxm *mxm, u8 version) { struct mxm_shadow_h *shadow = _mxm_shadow; do { nvkm_debug(&mxm->subdev, "checking %s\n", shadow->name); if (shadow->exec(mxm, version)) { if (mxms_valid(mxm)) return 0; kfree(mxm->mxms); mxm->mxms = NULL; } } while ((++shadow)->name); return -ENOENT; }

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static const struct nvkm_subdev_func nvkm_mxm = { };
int nvkm_mxm_new_(struct nvkm_device *device, int index, struct nvkm_mxm **pmxm) { struct nvkm_bios *bios = device->bios; struct nvkm_mxm *mxm; u8 ver, len; u16 data; if (!(mxm = *pmxm = kzalloc(sizeof(*mxm), GFP_KERNEL))) return -ENOMEM; nvkm_subdev_ctor(&nvkm_mxm, device, index, &mxm->subdev); data = mxm_table(bios, &ver, &len); if (!data || !(ver = nvbios_rd08(bios, data))) { nvkm_debug(&mxm->subdev, "no VBIOS data, nothing to do\n"); return 0; } nvkm_info(&mxm->subdev, "BIOS version %d.%d\n", ver >> 4, ver & 0x0f); nvkm_debug(&mxm->subdev, "module flags: %02x\n", nvbios_rd08(bios, data + 0x01)); nvkm_debug(&mxm->subdev, "config flags: %02x\n", nvbios_rd08(bios, data + 0x02)); if (mxm_shadow(mxm, ver)) { nvkm_warn(&mxm->subdev, "failed to locate valid SIS\n"); #if 0 /* we should, perhaps, fall back to some kind of limited * mode here if the x86 vbios hasn't already done the * work for us (so we prevent loading with completely * whacked vbios tables). */ return -EINVAL; #else return 0; #endif } nvkm_debug(&mxm->subdev, "MXMS Version %d.%d\n", mxms_version(mxm) >> 8, mxms_version(mxm) & 0xff); mxms_foreach(mxm, 0, NULL, NULL); if (nvkm_boolopt(device->cfgopt, "NvMXMDCB", true)) mxm->action |= MXM_SANITISE_DCB; return 0; }

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Ben Skeggs139597.76%975.00%
Jiang Liu302.10%18.33%
Rafael J. Wysocki10.07%18.33%
Marcin Ślusarz10.07%18.33%
Total1427100.00%12100.00%
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