mirror of
https://github.com/AetherDroid/android_kernel_samsung_on5xelte.git
synced 2025-09-09 01:28:05 -04:00
Fixed MTP to work with TWRP
This commit is contained in:
awab228
commit
f6dfaef42e
50820 changed files with 20846062 additions and 0 deletions
429
drivers/hv/hv.c
Normal file
429
drivers/hv/hv.c
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@ -0,0 +1,429 @@
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/*
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* Copyright (c) 2009, Microsoft Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place - Suite 330, Boston, MA 02111-1307 USA.
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*
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* Authors:
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* Haiyang Zhang <haiyangz@microsoft.com>
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* Hank Janssen <hjanssen@microsoft.com>
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*
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/hyperv.h>
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#include <linux/version.h>
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#include <linux/interrupt.h>
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#include <asm/hyperv.h>
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#include "hyperv_vmbus.h"
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/* The one and only */
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struct hv_context hv_context = {
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.synic_initialized = false,
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.hypercall_page = NULL,
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};
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/*
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* query_hypervisor_info - Get version info of the windows hypervisor
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*/
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unsigned int host_info_eax;
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unsigned int host_info_ebx;
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unsigned int host_info_ecx;
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unsigned int host_info_edx;
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static int query_hypervisor_info(void)
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{
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unsigned int eax;
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unsigned int ebx;
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unsigned int ecx;
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unsigned int edx;
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unsigned int max_leaf;
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unsigned int op;
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/*
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* Its assumed that this is called after confirming that Viridian
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* is present. Query id and revision.
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*/
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eax = 0;
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ebx = 0;
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ecx = 0;
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edx = 0;
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op = HVCPUID_VENDOR_MAXFUNCTION;
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cpuid(op, &eax, &ebx, &ecx, &edx);
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max_leaf = eax;
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if (max_leaf >= HVCPUID_VERSION) {
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eax = 0;
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ebx = 0;
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ecx = 0;
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edx = 0;
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op = HVCPUID_VERSION;
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cpuid(op, &eax, &ebx, &ecx, &edx);
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host_info_eax = eax;
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host_info_ebx = ebx;
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host_info_ecx = ecx;
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host_info_edx = edx;
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}
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return max_leaf;
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}
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/*
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* do_hypercall- Invoke the specified hypercall
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*/
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static u64 do_hypercall(u64 control, void *input, void *output)
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{
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#ifdef CONFIG_X86_64
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u64 hv_status = 0;
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u64 input_address = (input) ? virt_to_phys(input) : 0;
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u64 output_address = (output) ? virt_to_phys(output) : 0;
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void *hypercall_page = hv_context.hypercall_page;
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__asm__ __volatile__("mov %0, %%r8" : : "r" (output_address) : "r8");
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__asm__ __volatile__("call *%3" : "=a" (hv_status) :
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"c" (control), "d" (input_address),
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"m" (hypercall_page));
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return hv_status;
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#else
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u32 control_hi = control >> 32;
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u32 control_lo = control & 0xFFFFFFFF;
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u32 hv_status_hi = 1;
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u32 hv_status_lo = 1;
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u64 input_address = (input) ? virt_to_phys(input) : 0;
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u32 input_address_hi = input_address >> 32;
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u32 input_address_lo = input_address & 0xFFFFFFFF;
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u64 output_address = (output) ? virt_to_phys(output) : 0;
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u32 output_address_hi = output_address >> 32;
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u32 output_address_lo = output_address & 0xFFFFFFFF;
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void *hypercall_page = hv_context.hypercall_page;
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__asm__ __volatile__ ("call *%8" : "=d"(hv_status_hi),
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"=a"(hv_status_lo) : "d" (control_hi),
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"a" (control_lo), "b" (input_address_hi),
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"c" (input_address_lo), "D"(output_address_hi),
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"S"(output_address_lo), "m" (hypercall_page));
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return hv_status_lo | ((u64)hv_status_hi << 32);
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#endif /* !x86_64 */
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}
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/*
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* hv_init - Main initialization routine.
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*
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* This routine must be called before any other routines in here are called
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*/
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int hv_init(void)
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{
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int max_leaf;
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union hv_x64_msr_hypercall_contents hypercall_msr;
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void *virtaddr = NULL;
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memset(hv_context.synic_event_page, 0, sizeof(void *) * NR_CPUS);
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memset(hv_context.synic_message_page, 0,
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sizeof(void *) * NR_CPUS);
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memset(hv_context.post_msg_page, 0,
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sizeof(void *) * NR_CPUS);
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memset(hv_context.vp_index, 0,
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sizeof(int) * NR_CPUS);
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memset(hv_context.event_dpc, 0,
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sizeof(void *) * NR_CPUS);
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max_leaf = query_hypervisor_info();
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/*
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* Write our OS ID.
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*/
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hv_context.guestid = generate_guest_id(0, LINUX_VERSION_CODE, 0);
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wrmsrl(HV_X64_MSR_GUEST_OS_ID, hv_context.guestid);
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/* See if the hypercall page is already set */
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rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
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virtaddr = __vmalloc(PAGE_SIZE, GFP_KERNEL, PAGE_KERNEL_EXEC);
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if (!virtaddr)
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goto cleanup;
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hypercall_msr.enable = 1;
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hypercall_msr.guest_physical_address = vmalloc_to_pfn(virtaddr);
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wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
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/* Confirm that hypercall page did get setup. */
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hypercall_msr.as_uint64 = 0;
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rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
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if (!hypercall_msr.enable)
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goto cleanup;
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hv_context.hypercall_page = virtaddr;
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return 0;
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cleanup:
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if (virtaddr) {
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if (hypercall_msr.enable) {
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hypercall_msr.as_uint64 = 0;
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wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
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}
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vfree(virtaddr);
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}
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return -ENOTSUPP;
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}
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/*
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* hv_cleanup - Cleanup routine.
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*
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* This routine is called normally during driver unloading or exiting.
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*/
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void hv_cleanup(void)
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{
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union hv_x64_msr_hypercall_contents hypercall_msr;
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/* Reset our OS id */
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wrmsrl(HV_X64_MSR_GUEST_OS_ID, 0);
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if (hv_context.hypercall_page) {
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hypercall_msr.as_uint64 = 0;
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wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
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vfree(hv_context.hypercall_page);
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hv_context.hypercall_page = NULL;
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}
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}
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/*
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* hv_post_message - Post a message using the hypervisor message IPC.
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*
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* This involves a hypercall.
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*/
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int hv_post_message(union hv_connection_id connection_id,
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enum hv_message_type message_type,
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void *payload, size_t payload_size)
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{
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struct hv_input_post_message *aligned_msg;
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u16 status;
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if (payload_size > HV_MESSAGE_PAYLOAD_BYTE_COUNT)
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return -EMSGSIZE;
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aligned_msg = (struct hv_input_post_message *)
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hv_context.post_msg_page[get_cpu()];
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aligned_msg->connectionid = connection_id;
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aligned_msg->reserved = 0;
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aligned_msg->message_type = message_type;
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aligned_msg->payload_size = payload_size;
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memcpy((void *)aligned_msg->payload, payload, payload_size);
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status = do_hypercall(HVCALL_POST_MESSAGE, aligned_msg, NULL)
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& 0xFFFF;
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put_cpu();
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return status;
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}
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/*
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* hv_signal_event -
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* Signal an event on the specified connection using the hypervisor event IPC.
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*
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* This involves a hypercall.
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*/
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u16 hv_signal_event(void *con_id)
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{
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u16 status;
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status = (do_hypercall(HVCALL_SIGNAL_EVENT, con_id, NULL) & 0xFFFF);
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return status;
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}
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int hv_synic_alloc(void)
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{
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size_t size = sizeof(struct tasklet_struct);
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int cpu;
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for_each_online_cpu(cpu) {
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hv_context.event_dpc[cpu] = kmalloc(size, GFP_ATOMIC);
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if (hv_context.event_dpc[cpu] == NULL) {
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pr_err("Unable to allocate event dpc\n");
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goto err;
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}
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tasklet_init(hv_context.event_dpc[cpu], vmbus_on_event, cpu);
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hv_context.synic_message_page[cpu] =
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(void *)get_zeroed_page(GFP_ATOMIC);
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if (hv_context.synic_message_page[cpu] == NULL) {
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pr_err("Unable to allocate SYNIC message page\n");
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goto err;
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}
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hv_context.synic_event_page[cpu] =
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(void *)get_zeroed_page(GFP_ATOMIC);
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if (hv_context.synic_event_page[cpu] == NULL) {
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pr_err("Unable to allocate SYNIC event page\n");
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goto err;
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}
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hv_context.post_msg_page[cpu] =
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(void *)get_zeroed_page(GFP_ATOMIC);
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if (hv_context.post_msg_page[cpu] == NULL) {
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pr_err("Unable to allocate post msg page\n");
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goto err;
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}
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}
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return 0;
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err:
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return -ENOMEM;
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}
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static void hv_synic_free_cpu(int cpu)
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{
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kfree(hv_context.event_dpc[cpu]);
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if (hv_context.synic_event_page[cpu])
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free_page((unsigned long)hv_context.synic_event_page[cpu]);
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if (hv_context.synic_message_page[cpu])
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free_page((unsigned long)hv_context.synic_message_page[cpu]);
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if (hv_context.post_msg_page[cpu])
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free_page((unsigned long)hv_context.post_msg_page[cpu]);
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}
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void hv_synic_free(void)
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{
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int cpu;
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for_each_online_cpu(cpu)
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hv_synic_free_cpu(cpu);
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}
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/*
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* hv_synic_init - Initialize the Synthethic Interrupt Controller.
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*
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* If it is already initialized by another entity (ie x2v shim), we need to
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* retrieve the initialized message and event pages. Otherwise, we create and
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* initialize the message and event pages.
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*/
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void hv_synic_init(void *arg)
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{
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u64 version;
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union hv_synic_simp simp;
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union hv_synic_siefp siefp;
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union hv_synic_sint shared_sint;
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union hv_synic_scontrol sctrl;
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u64 vp_index;
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int cpu = smp_processor_id();
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if (!hv_context.hypercall_page)
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return;
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/* Check the version */
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rdmsrl(HV_X64_MSR_SVERSION, version);
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/* Setup the Synic's message page */
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rdmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
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simp.simp_enabled = 1;
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simp.base_simp_gpa = virt_to_phys(hv_context.synic_message_page[cpu])
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>> PAGE_SHIFT;
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wrmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
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/* Setup the Synic's event page */
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rdmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
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siefp.siefp_enabled = 1;
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siefp.base_siefp_gpa = virt_to_phys(hv_context.synic_event_page[cpu])
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>> PAGE_SHIFT;
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wrmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
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/* Setup the shared SINT. */
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rdmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
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shared_sint.as_uint64 = 0;
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shared_sint.vector = HYPERVISOR_CALLBACK_VECTOR;
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shared_sint.masked = false;
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shared_sint.auto_eoi = true;
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wrmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
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/* Enable the global synic bit */
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rdmsrl(HV_X64_MSR_SCONTROL, sctrl.as_uint64);
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sctrl.enable = 1;
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wrmsrl(HV_X64_MSR_SCONTROL, sctrl.as_uint64);
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hv_context.synic_initialized = true;
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/*
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* Setup the mapping between Hyper-V's notion
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* of cpuid and Linux' notion of cpuid.
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* This array will be indexed using Linux cpuid.
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*/
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rdmsrl(HV_X64_MSR_VP_INDEX, vp_index);
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hv_context.vp_index[cpu] = (u32)vp_index;
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INIT_LIST_HEAD(&hv_context.percpu_list[cpu]);
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return;
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}
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/*
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* hv_synic_cleanup - Cleanup routine for hv_synic_init().
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*/
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void hv_synic_cleanup(void *arg)
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{
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union hv_synic_sint shared_sint;
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union hv_synic_simp simp;
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union hv_synic_siefp siefp;
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int cpu = smp_processor_id();
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if (!hv_context.synic_initialized)
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return;
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rdmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
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shared_sint.masked = 1;
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/* Need to correctly cleanup in the case of SMP!!! */
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/* Disable the interrupt */
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wrmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
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rdmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
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simp.simp_enabled = 0;
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simp.base_simp_gpa = 0;
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wrmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
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rdmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
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siefp.siefp_enabled = 0;
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siefp.base_siefp_gpa = 0;
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wrmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
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free_page((unsigned long)hv_context.synic_message_page[cpu]);
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free_page((unsigned long)hv_context.synic_event_page[cpu]);
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}
|
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