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![Jiandi An](/assets/img/avatar_default.png)
Ensure all reserved fields of xatp are zero before making hypervisor call to XEN in xen_map_device_mmio(). xenmem_add_to_physmap_one() in XEN fails the mapping request if extra.res reserved field in xatp is not zero for XENMAPSPACE_dev_mmio request. Signed-off-by: Jiandi An <anjiandi@codeaurora.org> Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
198 lines
4.8 KiB
C
198 lines
4.8 KiB
C
/*
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* Copyright (c) 2015, Linaro Limited, Shannon Zhao
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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
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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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 = kzalloc(sizeof(xen_pfn_t) * nr, GFP_KERNEL);
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idxs = kzalloc(sizeof(xen_ulong_t) * nr, GFP_KERNEL);
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errs = kzalloc(sizeof(int) * nr, 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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