On Fri, 15 Jan 2016, Shannon Zhao wrote: > 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/arm-device.c | 140 +++++++++++++++++++++++++++++++++++++++++++++++ > 2 files changed, 141 insertions(+) > create mode 100644 drivers/xen/arm-device.c > > diff --git a/drivers/xen/Makefile b/drivers/xen/Makefile > index aa8a7f7..0c087b1 100644 > --- a/drivers/xen/Makefile > +++ b/drivers/xen/Makefile > @@ -9,6 +9,7 @@ CFLAGS_features.o := $(nostackp) > > CFLAGS_efi.o += -fshort-wchar > > +dom0-$(CONFIG_ARM64) += arm-device.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/arm-device.c b/drivers/xen/arm-device.c > new file mode 100644 > index 0000000..7d902ea > --- /dev/null > +++ b/drivers/xen/arm-device.c > @@ -0,0 +1,140 @@ > +/* > + * Copyright (c) 2015, Linaro Limited, Shannon Zhao > + * > + * 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/>. > + */ > + > +#include <linux/platform_device.h> > +#include <linux/acpi.h> > +#include <xen/xen.h> > +#include <xen/page.h> > +#include <xen/interface/memory.h> > +#include <asm/xen/hypervisor.h> > +#include <asm/xen/hypercall.h> > + > +static int xen_unmap_device_mmio(struct resource *resource, unsigned int count) > +{ > + unsigned int i, j, nr; > + int rc = 0; > + struct resource *r; > + struct xen_remove_from_physmap xrp; > + > + for (i = 0; i < count; i++) { > + r = &resource[i]; > + nr = DIV_ROUND_UP(resource_size(r), XEN_PAGE_SIZE); > + if ((resource_type(r) != IORESOURCE_MEM) || (nr == 0)) > + continue; > + > + for (j = 0; j < nr; j++) { > + xrp.domid = DOMID_SELF; > + xrp.gpfn = XEN_PFN_DOWN(r->start) + j; > + rc = HYPERVISOR_memory_op(XENMEM_remove_from_physmap, > + &xrp); > + if (rc) > + return rc; > + } > + } > + > + return rc; > +} > + > +static int xen_map_device_mmio(struct resource *resource, unsigned int count) > +{ > + unsigned int i, j, nr; > + int rc = 0; > + struct resource *r; > + xen_pfn_t *gpfns; > + xen_ulong_t *idxs; > + int *errs; > + struct xen_add_to_physmap_range xatp; > + > + for (i = 0; i < count; i++) { > + r = &resource[i]; > + nr = DIV_ROUND_UP(resource_size(r), XEN_PAGE_SIZE); > + if ((resource_type(r) != IORESOURCE_MEM) || (nr == 0)) > + continue; > + > + gpfns = kzalloc(sizeof(xen_pfn_t) * nr, GFP_KERNEL); > + idxs = kzalloc(sizeof(xen_ulong_t) * nr, GFP_KERNEL); > + errs = kzalloc(sizeof(int) * nr, GFP_KERNEL); > + if (!gpfns || !idxs || !errs) { > + kfree(gpfns); > + kfree(idxs); kfree(errs)? Aside from this: Acked-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx> > + return -ENOMEM; > + } > + > + for (j = 0; j < nr; j++) { > + gpfns[j] = XEN_PFN_DOWN(r->start) + j; > + idxs[j] = XEN_PFN_DOWN(r->start) + j; > + } > + > + 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) > + 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 (pdev->num_resources == 0 || pdev->resource == NULL) > + return NOTIFY_OK; > + > + switch (action) { > + case BUS_NOTIFY_ADD_DEVICE: > + r = xen_map_device_mmio(pdev->resource, pdev->num_resources); > + break; > + case BUS_NOTIFY_DEL_DEVICE: > + r = xen_unmap_device_mmio(pdev->resource, pdev->num_resources); > + break; > + default: > + return NOTIFY_DONE; > + } > + if (r) > + dev_err(&pdev->dev, "Platform: Failed to %s device %s MMIO!\n", > + action == BUS_NOTIFY_ADD_DEVICE ? "map" : > + (action == BUS_NOTIFY_DEL_DEVICE ? "unmap" : "?"), > + pdev->name); > + > + return NOTIFY_OK; > +} > + > +static struct notifier_block platform_device_nb = { > + .notifier_call = xen_platform_notifier, > +}; > + > +static int __init register_xen_platform_notifier(void) > +{ > + if (!xen_initial_domain() || acpi_disabled) > + return 0; > + > + return bus_register_notifier(&platform_bus_type, &platform_device_nb); > +} > + > +arch_initcall(register_xen_platform_notifier); -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
