From: Shannon Zhao <shannon.zhao@xxxxxxxxxx> Add a bus_notifier for platform bus device in order to map the device mmio regions when DOM0 booting with ACPI. Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx> --- drivers/xen/Makefile | 1 + drivers/xen/platform.c | 104 +++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 105 insertions(+) create mode 100644 drivers/xen/platform.c diff --git a/drivers/xen/Makefile b/drivers/xen/Makefile index e293bc5..2f867e7 100644 --- a/drivers/xen/Makefile +++ b/drivers/xen/Makefile @@ -11,6 +11,7 @@ CFLAGS_features.o := $(nostackp) CFLAGS_efi.o += -fshort-wchar +dom0-$(CONFIG_ARM64) += platform.o dom0-$(CONFIG_PCI) += pci.o dom0-$(CONFIG_USB_SUPPORT) += dbgp.o dom0-$(CONFIG_XEN_ACPI) += acpi.o $(xen-pad-y) diff --git a/drivers/xen/platform.c b/drivers/xen/platform.c new file mode 100644 index 0000000..0f95e7f --- /dev/null +++ b/drivers/xen/platform.c @@ -0,0 +1,104 @@ +/* + * Copyright (c) 2015, Linaro Limited. + * + * 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, write to the Free Software Foundation, Inc., 59 Temple + * Place - Suite 330, Boston, MA 02111-1307 USA. + * + * Author: Shannon Zhao <shannon.zhao@xxxxxxxxxx> + */ + +#include <linux/platform_device.h> +#include <linux/acpi.h> +#include <xen/xen.h> +#include <xen/interface/memory.h> +#include <asm/xen/hypervisor.h> +#include <asm/xen/hypercall.h> + +static int xen_map_platform_device_mmio(struct platform_device *pdev) +{ + int i, rc = 0; + + for (i = 0; i < pdev->num_resources; i++) + { + struct resource *r = &pdev->resource[i]; + + if (resource_type(r) == IORESOURCE_MEM) + { + int j; + int nr = DIV_ROUND_UP(resource_size(r), PAGE_SIZE); + xen_pfn_t *gpfns = kmalloc(sizeof(xen_pfn_t) * nr, + GFP_KERNEL); + xen_ulong_t *idxs = kmalloc(sizeof(xen_ulong_t) * nr, + GFP_KERNEL); + int *errs = kmalloc(sizeof(int) * nr, GFP_KERNEL); + struct xen_add_to_physmap_range xatp; + + for (j = 0; j < nr; j++) { + gpfns[j] = (r->start >> PAGE_SHIFT) + j; + idxs[j] = (r->start >> PAGE_SHIFT) + j; + errs[j] = 0; + } + + xatp.domid = DOMID_SELF; + xatp.size = nr; + xatp.space = XENMAPSPACE_dev_mmio; + + set_xen_guest_handle(xatp.gpfns, gpfns); + set_xen_guest_handle(xatp.idxs, idxs); + set_xen_guest_handle(xatp.errs, errs); + + rc = HYPERVISOR_memory_op(XENMEM_add_to_physmap_range, + &xatp); + kfree(gpfns); + kfree(idxs); + kfree(errs); + if (rc != 0) + return rc; + } + } + + return rc; +} + +static int xen_platform_notifier(struct notifier_block *nb, + unsigned long action, void *data) +{ + struct platform_device *pdev = to_platform_device(data); + int r = 0; + + if (!acpi_disabled && (action == BUS_NOTIFY_ADD_DEVICE)) + r = xen_map_platform_device_mmio(pdev); + + if (r) + { + dev_err(&pdev->dev, "Failed to add_to_physmap device (%s) mmio!\n", + pdev->name); + return NOTIFY_OK; + } + + return NOTIFY_DONE; +} + +static struct notifier_block platform_device_nb = { + .notifier_call = xen_platform_notifier, +}; + +static int __init register_xen_platform_notifier(void) +{ + if (!xen_initial_domain()) + return 0; + + return bus_register_notifier(&platform_bus_type, &platform_device_nb); +} + +arch_initcall(register_xen_platform_notifier); -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe linux-efi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html