[Xen-devel] [PATCH v11 06/17] Xen: ARM: Add support for mapping platform device mmio

[Shannon Zhao <zhaoshenglong@xxxxxxxxxx>]

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>
Acked-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
---
 drivers/xen/Makefile     |   1 +
 drivers/xen/arm-device.c | 153 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 154 insertions(+)
 create mode 100644 drivers/xen/arm-device.c

diff --git a/drivers/xen/Makefile b/drivers/xen/Makefile
index 9b7a35c..415f286 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..b918e8e
--- /dev/null
+++ b/drivers/xen/arm-device.c
@@ -0,0 +1,153 @@
+/*
+ * 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(const struct resource *resources,
+                                unsigned int count)
+{
+       unsigned int i, j, nr;
+       int rc = 0;
+       const struct resource *r;
+       struct xen_remove_from_physmap xrp;
+
+       for (i = 0; i < count; i++) {
+               r = &resources[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(const struct resource *resources,
+                              unsigned int count)
+{
+       unsigned int i, j, nr;
+       int rc = 0;
+       const 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 = &resources[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);
+                       rc = -ENOMEM;
+                       goto unmap;
+               }
+
+               for (j = 0; j < nr; j++) {
+                       /*
+                        * The regions are always mapped 1:1 to DOM0 and this is
+                        * fine because the memory map for DOM0 is the same as
+                        * the host (except for the RAM).
+                        */
+                       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)
+                       goto unmap;
+       }
+
+       return rc;
+
+unmap:
+       xen_unmap_device_mmio(resources, i);
+       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);
-- 
2.0.4



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