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![Joe Perches](/assets/img/avatar_default.png)
Convert printks to pr_<level> (excludes printk(KERN_DEBUG...) to be more consistent throughout the xen subsystem. Add pr_fmt with KBUILD_MODNAME or "xen:" KBUILD_MODNAME Coalesce formats and add missing word spaces Add missing newlines Align arguments and reflow to 80 columns Remove DRV_NAME from formats as pr_fmt adds the same content This does change some of the prefixes of these messages but it also does make them more consistent. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
485 lines
12 KiB
C
485 lines
12 KiB
C
/*
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* Copyright (C) 2012 Intel Corporation
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* Author: Liu Jinsong <jinsong.liu@intel.com>
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* Author: Jiang Yunhong <yunhong.jiang@intel.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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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/module.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/acpi.h>
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#include <acpi/acpi_drivers.h>
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#include <xen/acpi.h>
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#include <xen/interface/platform.h>
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#include <asm/xen/hypercall.h>
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#define PREFIX "ACPI:xen_memory_hotplug:"
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struct acpi_memory_info {
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struct list_head list;
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u64 start_addr; /* Memory Range start physical addr */
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u64 length; /* Memory Range length */
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unsigned short caching; /* memory cache attribute */
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unsigned short write_protect; /* memory read/write attribute */
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/* copied from buffer getting from _CRS */
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unsigned int enabled:1;
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};
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struct acpi_memory_device {
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struct acpi_device *device;
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struct list_head res_list;
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};
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static bool acpi_hotmem_initialized __read_mostly;
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static int xen_hotadd_memory(int pxm, struct acpi_memory_info *info)
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{
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int rc;
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struct xen_platform_op op;
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op.cmd = XENPF_mem_hotadd;
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op.u.mem_add.spfn = info->start_addr >> PAGE_SHIFT;
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op.u.mem_add.epfn = (info->start_addr + info->length) >> PAGE_SHIFT;
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op.u.mem_add.pxm = pxm;
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rc = HYPERVISOR_dom0_op(&op);
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if (rc)
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pr_err(PREFIX "Xen Hotplug Memory Add failed on "
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"0x%lx -> 0x%lx, _PXM: %d, error: %d\n",
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(unsigned long)info->start_addr,
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(unsigned long)(info->start_addr + info->length),
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pxm, rc);
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return rc;
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}
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static int xen_acpi_memory_enable_device(struct acpi_memory_device *mem_device)
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{
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int pxm, result;
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int num_enabled = 0;
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struct acpi_memory_info *info;
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if (!mem_device)
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return -EINVAL;
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pxm = xen_acpi_get_pxm(mem_device->device->handle);
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if (pxm < 0)
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return pxm;
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list_for_each_entry(info, &mem_device->res_list, list) {
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if (info->enabled) { /* just sanity check...*/
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num_enabled++;
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continue;
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}
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if (!info->length)
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continue;
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result = xen_hotadd_memory(pxm, info);
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if (result)
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continue;
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info->enabled = 1;
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num_enabled++;
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}
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if (!num_enabled)
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return -ENODEV;
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return 0;
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}
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static acpi_status
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acpi_memory_get_resource(struct acpi_resource *resource, void *context)
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{
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struct acpi_memory_device *mem_device = context;
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struct acpi_resource_address64 address64;
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struct acpi_memory_info *info, *new;
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acpi_status status;
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status = acpi_resource_to_address64(resource, &address64);
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if (ACPI_FAILURE(status) ||
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(address64.resource_type != ACPI_MEMORY_RANGE))
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return AE_OK;
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list_for_each_entry(info, &mem_device->res_list, list) {
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if ((info->caching == address64.info.mem.caching) &&
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(info->write_protect == address64.info.mem.write_protect) &&
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(info->start_addr + info->length == address64.minimum)) {
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info->length += address64.address_length;
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return AE_OK;
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}
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}
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new = kzalloc(sizeof(struct acpi_memory_info), GFP_KERNEL);
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if (!new)
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return AE_ERROR;
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INIT_LIST_HEAD(&new->list);
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new->caching = address64.info.mem.caching;
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new->write_protect = address64.info.mem.write_protect;
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new->start_addr = address64.minimum;
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new->length = address64.address_length;
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list_add_tail(&new->list, &mem_device->res_list);
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return AE_OK;
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}
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static int
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acpi_memory_get_device_resources(struct acpi_memory_device *mem_device)
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{
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acpi_status status;
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struct acpi_memory_info *info, *n;
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if (!list_empty(&mem_device->res_list))
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return 0;
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status = acpi_walk_resources(mem_device->device->handle,
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METHOD_NAME__CRS, acpi_memory_get_resource, mem_device);
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if (ACPI_FAILURE(status)) {
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list_for_each_entry_safe(info, n, &mem_device->res_list, list)
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kfree(info);
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INIT_LIST_HEAD(&mem_device->res_list);
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return -EINVAL;
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}
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return 0;
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}
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static int acpi_memory_get_device(acpi_handle handle,
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struct acpi_memory_device **mem_device)
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{
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struct acpi_device *device = NULL;
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int result = 0;
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acpi_scan_lock_acquire();
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acpi_bus_get_device(handle, &device);
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if (device)
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goto end;
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/*
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* Now add the notified device. This creates the acpi_device
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* and invokes .add function
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*/
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result = acpi_bus_scan(handle);
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if (result) {
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pr_warn(PREFIX "ACPI namespace scan failed\n");
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result = -EINVAL;
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goto out;
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}
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result = acpi_bus_get_device(handle, &device);
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if (result) {
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pr_warn(PREFIX "Missing device object\n");
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result = -EINVAL;
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goto out;
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}
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end:
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*mem_device = acpi_driver_data(device);
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if (!(*mem_device)) {
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pr_err(PREFIX "driver data not found\n");
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result = -ENODEV;
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goto out;
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}
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out:
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acpi_scan_lock_release();
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return result;
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}
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static int acpi_memory_check_device(struct acpi_memory_device *mem_device)
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{
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unsigned long long current_status;
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/* Get device present/absent information from the _STA */
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if (ACPI_FAILURE(acpi_evaluate_integer(mem_device->device->handle,
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"_STA", NULL, ¤t_status)))
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return -ENODEV;
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/*
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* Check for device status. Device should be
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* present/enabled/functioning.
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*/
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if (!((current_status & ACPI_STA_DEVICE_PRESENT)
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&& (current_status & ACPI_STA_DEVICE_ENABLED)
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&& (current_status & ACPI_STA_DEVICE_FUNCTIONING)))
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return -ENODEV;
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return 0;
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}
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static int acpi_memory_disable_device(struct acpi_memory_device *mem_device)
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{
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pr_debug(PREFIX "Xen does not support memory hotremove\n");
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return -ENOSYS;
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}
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static void acpi_memory_device_notify(acpi_handle handle, u32 event, void *data)
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{
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struct acpi_memory_device *mem_device;
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struct acpi_device *device;
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u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
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switch (event) {
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case ACPI_NOTIFY_BUS_CHECK:
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"\nReceived BUS CHECK notification for device\n"));
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/* Fall Through */
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case ACPI_NOTIFY_DEVICE_CHECK:
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if (event == ACPI_NOTIFY_DEVICE_CHECK)
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"\nReceived DEVICE CHECK notification for device\n"));
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if (acpi_memory_get_device(handle, &mem_device)) {
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pr_err(PREFIX "Cannot find driver data\n");
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break;
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}
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ost_code = ACPI_OST_SC_SUCCESS;
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break;
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case ACPI_NOTIFY_EJECT_REQUEST:
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"\nReceived EJECT REQUEST notification for device\n"));
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acpi_scan_lock_acquire();
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if (acpi_bus_get_device(handle, &device)) {
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acpi_scan_lock_release();
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pr_err(PREFIX "Device doesn't exist\n");
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break;
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}
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mem_device = acpi_driver_data(device);
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if (!mem_device) {
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acpi_scan_lock_release();
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pr_err(PREFIX "Driver Data is NULL\n");
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break;
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}
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/*
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* TBD: implement acpi_memory_disable_device and invoke
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* acpi_bus_remove if Xen support hotremove in the future
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*/
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acpi_memory_disable_device(mem_device);
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acpi_scan_lock_release();
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break;
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default:
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Unsupported event [0x%x]\n", event));
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/* non-hotplug event; possibly handled by other handler */
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return;
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}
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(void) acpi_evaluate_hotplug_ost(handle, event, ost_code, NULL);
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return;
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}
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static int xen_acpi_memory_device_add(struct acpi_device *device)
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{
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int result;
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struct acpi_memory_device *mem_device = NULL;
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if (!device)
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return -EINVAL;
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mem_device = kzalloc(sizeof(struct acpi_memory_device), GFP_KERNEL);
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if (!mem_device)
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return -ENOMEM;
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INIT_LIST_HEAD(&mem_device->res_list);
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mem_device->device = device;
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sprintf(acpi_device_name(device), "%s", ACPI_MEMORY_DEVICE_NAME);
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sprintf(acpi_device_class(device), "%s", ACPI_MEMORY_DEVICE_CLASS);
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device->driver_data = mem_device;
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/* Get the range from the _CRS */
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result = acpi_memory_get_device_resources(mem_device);
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if (result) {
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kfree(mem_device);
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return result;
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}
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/*
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* For booting existed memory devices, early boot code has recognized
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* memory area by EFI/E820. If DSDT shows these memory devices on boot,
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* hotplug is not necessary for them.
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* For hot-added memory devices during runtime, it need hypercall to
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* Xen hypervisor to add memory.
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*/
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if (!acpi_hotmem_initialized)
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return 0;
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if (!acpi_memory_check_device(mem_device))
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result = xen_acpi_memory_enable_device(mem_device);
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return result;
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}
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static int xen_acpi_memory_device_remove(struct acpi_device *device)
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{
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struct acpi_memory_device *mem_device = NULL;
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if (!device || !acpi_driver_data(device))
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return -EINVAL;
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mem_device = acpi_driver_data(device);
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kfree(mem_device);
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return 0;
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}
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/*
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* Helper function to check for memory device
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*/
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static acpi_status is_memory_device(acpi_handle handle)
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{
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char *hardware_id;
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acpi_status status;
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struct acpi_device_info *info;
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status = acpi_get_object_info(handle, &info);
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if (ACPI_FAILURE(status))
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return status;
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if (!(info->valid & ACPI_VALID_HID)) {
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kfree(info);
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return AE_ERROR;
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}
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hardware_id = info->hardware_id.string;
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if ((hardware_id == NULL) ||
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(strcmp(hardware_id, ACPI_MEMORY_DEVICE_HID)))
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status = AE_ERROR;
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kfree(info);
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return status;
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}
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static acpi_status
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acpi_memory_register_notify_handler(acpi_handle handle,
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u32 level, void *ctxt, void **retv)
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{
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acpi_status status;
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status = is_memory_device(handle);
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if (ACPI_FAILURE(status))
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return AE_OK; /* continue */
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status = acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY,
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acpi_memory_device_notify, NULL);
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/* continue */
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return AE_OK;
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}
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static acpi_status
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acpi_memory_deregister_notify_handler(acpi_handle handle,
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u32 level, void *ctxt, void **retv)
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{
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acpi_status status;
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status = is_memory_device(handle);
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if (ACPI_FAILURE(status))
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return AE_OK; /* continue */
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status = acpi_remove_notify_handler(handle,
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ACPI_SYSTEM_NOTIFY,
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acpi_memory_device_notify);
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return AE_OK; /* continue */
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}
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static const struct acpi_device_id memory_device_ids[] = {
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{ACPI_MEMORY_DEVICE_HID, 0},
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{"", 0},
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};
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MODULE_DEVICE_TABLE(acpi, memory_device_ids);
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static struct acpi_driver xen_acpi_memory_device_driver = {
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.name = "acpi_memhotplug",
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.class = ACPI_MEMORY_DEVICE_CLASS,
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.ids = memory_device_ids,
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.ops = {
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.add = xen_acpi_memory_device_add,
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.remove = xen_acpi_memory_device_remove,
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},
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};
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static int __init xen_acpi_memory_device_init(void)
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{
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int result;
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acpi_status status;
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if (!xen_initial_domain())
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return -ENODEV;
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/* unregister the stub which only used to reserve driver space */
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xen_stub_memory_device_exit();
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result = acpi_bus_register_driver(&xen_acpi_memory_device_driver);
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if (result < 0) {
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xen_stub_memory_device_init();
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return -ENODEV;
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}
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status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
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ACPI_UINT32_MAX,
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acpi_memory_register_notify_handler,
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NULL, NULL, NULL);
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if (ACPI_FAILURE(status)) {
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pr_warn(PREFIX "walk_namespace failed\n");
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acpi_bus_unregister_driver(&xen_acpi_memory_device_driver);
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xen_stub_memory_device_init();
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return -ENODEV;
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}
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acpi_hotmem_initialized = true;
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return 0;
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}
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static void __exit xen_acpi_memory_device_exit(void)
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{
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acpi_status status;
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if (!xen_initial_domain())
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return;
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status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
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ACPI_UINT32_MAX,
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acpi_memory_deregister_notify_handler,
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NULL, NULL, NULL);
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if (ACPI_FAILURE(status))
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pr_warn(PREFIX "walk_namespace failed\n");
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acpi_bus_unregister_driver(&xen_acpi_memory_device_driver);
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/*
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* stub reserve space again to prevent any chance of native
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* driver loading.
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*/
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xen_stub_memory_device_init();
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return;
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}
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module_init(xen_acpi_memory_device_init);
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module_exit(xen_acpi_memory_device_exit);
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ACPI_MODULE_NAME("xen-acpi-memhotplug");
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MODULE_AUTHOR("Liu Jinsong <jinsong.liu@intel.com>");
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MODULE_DESCRIPTION("Xen Hotplug Mem Driver");
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MODULE_LICENSE("GPL");
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