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![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms and conditions of the gnu general public license version 2 as published by the free software foundation this program is distributed in the hope it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not see http www gnu org licenses extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 228 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Steve Winslow <swinslow@gmail.com> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190528171438.107155473@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
187 lines
4.2 KiB
C
187 lines
4.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2015, Linaro Limited, Shannon Zhao
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*/
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#include <linux/platform_device.h>
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#include <linux/acpi.h>
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#include <xen/xen.h>
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#include <xen/page.h>
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#include <xen/interface/memory.h>
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#include <asm/xen/hypervisor.h>
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#include <asm/xen/hypercall.h>
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static int xen_unmap_device_mmio(const struct resource *resources,
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unsigned int count)
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{
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unsigned int i, j, nr;
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int rc = 0;
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const struct resource *r;
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struct xen_remove_from_physmap xrp;
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for (i = 0; i < count; i++) {
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r = &resources[i];
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nr = DIV_ROUND_UP(resource_size(r), XEN_PAGE_SIZE);
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if ((resource_type(r) != IORESOURCE_MEM) || (nr == 0))
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continue;
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for (j = 0; j < nr; j++) {
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xrp.domid = DOMID_SELF;
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xrp.gpfn = XEN_PFN_DOWN(r->start) + j;
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rc = HYPERVISOR_memory_op(XENMEM_remove_from_physmap,
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&xrp);
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if (rc)
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return rc;
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}
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}
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return rc;
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}
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static int xen_map_device_mmio(const struct resource *resources,
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unsigned int count)
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{
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unsigned int i, j, nr;
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int rc = 0;
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const struct resource *r;
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xen_pfn_t *gpfns;
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xen_ulong_t *idxs;
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int *errs;
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for (i = 0; i < count; i++) {
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struct xen_add_to_physmap_range xatp = {
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.domid = DOMID_SELF,
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.space = XENMAPSPACE_dev_mmio
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};
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r = &resources[i];
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nr = DIV_ROUND_UP(resource_size(r), XEN_PAGE_SIZE);
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if ((resource_type(r) != IORESOURCE_MEM) || (nr == 0))
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continue;
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gpfns = kcalloc(nr, sizeof(xen_pfn_t), GFP_KERNEL);
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idxs = kcalloc(nr, sizeof(xen_ulong_t), GFP_KERNEL);
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errs = kcalloc(nr, sizeof(int), GFP_KERNEL);
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if (!gpfns || !idxs || !errs) {
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kfree(gpfns);
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kfree(idxs);
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kfree(errs);
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rc = -ENOMEM;
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goto unmap;
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}
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for (j = 0; j < nr; j++) {
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/*
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* The regions are always mapped 1:1 to DOM0 and this is
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* fine because the memory map for DOM0 is the same as
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* the host (except for the RAM).
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*/
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gpfns[j] = XEN_PFN_DOWN(r->start) + j;
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idxs[j] = XEN_PFN_DOWN(r->start) + j;
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}
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xatp.size = nr;
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set_xen_guest_handle(xatp.gpfns, gpfns);
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set_xen_guest_handle(xatp.idxs, idxs);
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set_xen_guest_handle(xatp.errs, errs);
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rc = HYPERVISOR_memory_op(XENMEM_add_to_physmap_range, &xatp);
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kfree(gpfns);
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kfree(idxs);
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kfree(errs);
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if (rc)
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goto unmap;
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}
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return rc;
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unmap:
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xen_unmap_device_mmio(resources, i);
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return rc;
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}
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static int xen_platform_notifier(struct notifier_block *nb,
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unsigned long action, void *data)
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{
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struct platform_device *pdev = to_platform_device(data);
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int r = 0;
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if (pdev->num_resources == 0 || pdev->resource == NULL)
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return NOTIFY_OK;
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switch (action) {
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case BUS_NOTIFY_ADD_DEVICE:
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r = xen_map_device_mmio(pdev->resource, pdev->num_resources);
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break;
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case BUS_NOTIFY_DEL_DEVICE:
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r = xen_unmap_device_mmio(pdev->resource, pdev->num_resources);
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break;
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default:
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return NOTIFY_DONE;
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}
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if (r)
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dev_err(&pdev->dev, "Platform: Failed to %s device %s MMIO!\n",
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action == BUS_NOTIFY_ADD_DEVICE ? "map" :
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(action == BUS_NOTIFY_DEL_DEVICE ? "unmap" : "?"),
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pdev->name);
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return NOTIFY_OK;
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}
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static struct notifier_block platform_device_nb = {
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.notifier_call = xen_platform_notifier,
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};
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static int __init register_xen_platform_notifier(void)
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{
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if (!xen_initial_domain() || acpi_disabled)
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return 0;
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return bus_register_notifier(&platform_bus_type, &platform_device_nb);
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}
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arch_initcall(register_xen_platform_notifier);
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#ifdef CONFIG_ARM_AMBA
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#include <linux/amba/bus.h>
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static int xen_amba_notifier(struct notifier_block *nb,
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unsigned long action, void *data)
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{
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struct amba_device *adev = to_amba_device(data);
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int r = 0;
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switch (action) {
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case BUS_NOTIFY_ADD_DEVICE:
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r = xen_map_device_mmio(&adev->res, 1);
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break;
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case BUS_NOTIFY_DEL_DEVICE:
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r = xen_unmap_device_mmio(&adev->res, 1);
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break;
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default:
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return NOTIFY_DONE;
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}
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if (r)
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dev_err(&adev->dev, "AMBA: Failed to %s device %s MMIO!\n",
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action == BUS_NOTIFY_ADD_DEVICE ? "map" :
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(action == BUS_NOTIFY_DEL_DEVICE ? "unmap" : "?"),
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adev->dev.init_name);
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return NOTIFY_OK;
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}
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static struct notifier_block amba_device_nb = {
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.notifier_call = xen_amba_notifier,
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};
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static int __init register_xen_amba_notifier(void)
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{
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if (!xen_initial_domain() || acpi_disabled)
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return 0;
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return bus_register_notifier(&amba_bustype, &amba_device_nb);
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}
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arch_initcall(register_xen_amba_notifier);
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#endif
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