1 files changed, 309 insertions, 14 deletions

diff --git a/qemu/hw/arm/sysbus-fdt.c b/qemu/hw/arm/sysbus-fdt.c
index 9d28797c8..5debb3348 100644
--- a/qemu/hw/arm/sysbus-fdt.c
+++ b/qemu/hw/arm/sysbus-fdt.c
@@ -21,6 +21,13 @@
  *
  */
 
+#include "qemu/osdep.h"
+#include "qapi/error.h"
+#include <libfdt.h>
+#include "qemu-common.h"
+#ifdef CONFIG_LINUX
+#include <linux/vfio.h>
+#endif
 #include "hw/arm/sysbus-fdt.h"
 #include "qemu/error-report.h"
 #include "sysemu/device_tree.h"
@@ -28,6 +35,7 @@
 #include "sysemu/sysemu.h"
 #include "hw/vfio/vfio-platform.h"
 #include "hw/vfio/vfio-calxeda-xgmac.h"
+#include "hw/vfio/vfio-amd-xgbe.h"
 #include "hw/arm/fdt.h"
 
 /*
@@ -56,6 +64,146 @@ typedef struct NodeCreationPair {
     int (*add_fdt_node_fn)(SysBusDevice *sbdev, void *opaque);
 } NodeCreationPair;
 
+/* helpers */
+
+typedef struct HostProperty {
+    const char *name;
+    bool optional;
+} HostProperty;
+
+#ifdef CONFIG_LINUX
+
+/**
+ * copy_properties_from_host
+ *
+ * copies properties listed in an array from host device tree to
+ * guest device tree. If a non optional property is not found, the
+ * function asserts. An optional property is ignored if not found
+ * in the host device tree.
+ * @props: array of HostProperty to copy
+ * @nb_props: number of properties in the array
+ * @host_dt: host device tree blob
+ * @guest_dt: guest device tree blob
+ * @node_path: host dt node path where the property is supposed to be
+              found
+ * @nodename: guest node name the properties should be added to
+ */
+static void copy_properties_from_host(HostProperty *props, int nb_props,
+                                      void *host_fdt, void *guest_fdt,
+                                      char *node_path, char *nodename)
+{
+    int i, prop_len;
+    const void *r;
+    Error *err = NULL;
+
+    for (i = 0; i < nb_props; i++) {
+        r = qemu_fdt_getprop(host_fdt, node_path,
+                             props[i].name,
+                             &prop_len,
+                             props[i].optional ? &err : &error_fatal);
+        if (r) {
+            qemu_fdt_setprop(guest_fdt, nodename,
+                             props[i].name, r, prop_len);
+        } else {
+            if (prop_len != -FDT_ERR_NOTFOUND) {
+                /* optional property not returned although property exists */
+                error_report_err(err);
+            } else {
+                error_free(err);
+            }
+        }
+    }
+}
+
+/* clock properties whose values are copied/pasted from host */
+static HostProperty clock_copied_properties[] = {
+    {"compatible", false},
+    {"#clock-cells", false},
+    {"clock-frequency", true},
+    {"clock-output-names", true},
+};
+
+/**
+ * fdt_build_clock_node
+ *
+ * Build a guest clock node, used as a dependency from a passthrough'ed
+ * device. Most information are retrieved from the host clock node.
+ * Also check the host clock is a fixed one.
+ *
+ * @host_fdt: host device tree blob from which info are retrieved
+ * @guest_fdt: guest device tree blob where the clock node is added
+ * @host_phandle: phandle of the clock in host device tree
+ * @guest_phandle: phandle to assign to the guest node
+ */
+static void fdt_build_clock_node(void *host_fdt, void *guest_fdt,
+                                uint32_t host_phandle,
+                                uint32_t guest_phandle)
+{
+    char *node_path = NULL;
+    char *nodename;
+    const void *r;
+    int ret, node_offset, prop_len, path_len = 16;
+
+    node_offset = fdt_node_offset_by_phandle(host_fdt, host_phandle);
+    if (node_offset <= 0) {
+        error_setg(&error_fatal,
+                   "not able to locate clock handle %d in host device tree",
+                   host_phandle);
+    }
+    node_path = g_malloc(path_len);
+    while ((ret = fdt_get_path(host_fdt, node_offset, node_path, path_len))
+            == -FDT_ERR_NOSPACE) {
+        path_len += 16;
+        node_path = g_realloc(node_path, path_len);
+    }
+    if (ret < 0) {
+        error_setg(&error_fatal,
+                   "not able to retrieve node path for clock handle %d",
+                   host_phandle);
+    }
+
+    r = qemu_fdt_getprop(host_fdt, node_path, "compatible", &prop_len,
+                         &error_fatal);
+    if (strcmp(r, "fixed-clock")) {
+        error_setg(&error_fatal,
+                   "clock handle %d is not a fixed clock", host_phandle);
+    }
+
+    nodename = strrchr(node_path, '/');
+    qemu_fdt_add_subnode(guest_fdt, nodename);
+
+    copy_properties_from_host(clock_copied_properties,
+                              ARRAY_SIZE(clock_copied_properties),
+                              host_fdt, guest_fdt,
+                              node_path, nodename);
+
+    qemu_fdt_setprop_cell(guest_fdt, nodename, "phandle", guest_phandle);
+
+    g_free(node_path);
+}
+
+/**
+ * sysfs_to_dt_name: convert the name found in sysfs into the node name
+ * for instance e0900000.xgmac is converted into xgmac@e0900000
+ * @sysfs_name: directory name in sysfs
+ *
+ * returns the device tree name upon success or NULL in case the sysfs name
+ * does not match the expected format
+ */
+static char *sysfs_to_dt_name(const char *sysfs_name)
+{
+    gchar **substrings =  g_strsplit(sysfs_name, ".", 2);
+    char *dt_name = NULL;
+
+    if (!substrings || !substrings[0] || !substrings[1]) {
+        goto out;
+    }
+    dt_name = g_strdup_printf("%s@%s", substrings[1], substrings[0]);
+out:
+    g_strfreev(substrings);
+    return dt_name;
+}
+
 /* Device Specific Code */
 
 /**
@@ -70,7 +218,7 @@ static int add_calxeda_midway_xgmac_fdt_node(SysBusDevice *sbdev, void *opaque)
     PlatformBusDevice *pbus = data->pbus;
     void *fdt = data->fdt;
     const char *parent_node = data->pbus_node_name;
-    int compat_str_len, i, ret = -1;
+    int compat_str_len, i;
     char *nodename;
     uint32_t *irq_attr, *reg_attr;
     uint64_t mmio_base, irq_number;
@@ -93,14 +241,10 @@ static int add_calxeda_midway_xgmac_fdt_node(SysBusDevice *sbdev, void *opaque)
         mmio_base = platform_bus_get_mmio_addr(pbus, sbdev, i);
         reg_attr[2 * i] = cpu_to_be32(mmio_base);
         reg_attr[2 * i + 1] = cpu_to_be32(
-                                memory_region_size(&vdev->regions[i]->mem));
-    }
-    ret = qemu_fdt_setprop(fdt, nodename, "reg", reg_attr,
-                           vbasedev->num_regions * 2 * sizeof(uint32_t));
-    if (ret) {
-        error_report("could not set reg property of node %s", nodename);
-        goto fail_reg;
+                                memory_region_size(vdev->regions[i]->mem));
     }
+    qemu_fdt_setprop(fdt, nodename, "reg", reg_attr,
+                     vbasedev->num_regions * 2 * sizeof(uint32_t));
 
     irq_attr = g_new(uint32_t, vbasedev->num_irqs * 3);
     for (i = 0; i < vbasedev->num_irqs; i++) {
@@ -110,22 +254,173 @@ static int add_calxeda_midway_xgmac_fdt_node(SysBusDevice *sbdev, void *opaque)
         irq_attr[3 * i + 1] = cpu_to_be32(irq_number);
         irq_attr[3 * i + 2] = cpu_to_be32(GIC_FDT_IRQ_FLAGS_LEVEL_HI);
     }
-    ret = qemu_fdt_setprop(fdt, nodename, "interrupts",
+    qemu_fdt_setprop(fdt, nodename, "interrupts",
                      irq_attr, vbasedev->num_irqs * 3 * sizeof(uint32_t));
-    if (ret) {
-        error_report("could not set interrupts property of node %s",
-                     nodename);
+    g_free(irq_attr);
+    g_free(reg_attr);
+    g_free(nodename);
+    return 0;
+}
+
+/* AMD xgbe properties whose values are copied/pasted from host */
+static HostProperty amd_xgbe_copied_properties[] = {
+    {"compatible", false},
+    {"dma-coherent", true},
+    {"amd,per-channel-interrupt", true},
+    {"phy-mode", false},
+    {"mac-address", true},
+    {"amd,speed-set", false},
+    {"amd,serdes-blwc", true},
+    {"amd,serdes-cdr-rate", true},
+    {"amd,serdes-pq-skew", true},
+    {"amd,serdes-tx-amp", true},
+    {"amd,serdes-dfe-tap-config", true},
+    {"amd,serdes-dfe-tap-enable", true},
+    {"clock-names", false},
+};
+
+/**
+ * add_amd_xgbe_fdt_node
+ *
+ * Generates the combined xgbe/phy node following kernel >=4.2
+ * binding documentation:
+ * Documentation/devicetree/bindings/net/amd-xgbe.txt:
+ * Also 2 clock nodes are created (dma and ptp)
+ *
+ * Asserts in case of error
+ */
+static int add_amd_xgbe_fdt_node(SysBusDevice *sbdev, void *opaque)
+{
+    PlatformBusFDTData *data = opaque;
+    PlatformBusDevice *pbus = data->pbus;
+    VFIOPlatformDevice *vdev = VFIO_PLATFORM_DEVICE(sbdev);
+    VFIODevice *vbasedev = &vdev->vbasedev;
+    VFIOINTp *intp;
+    const char *parent_node = data->pbus_node_name;
+    char **node_path, *nodename, *dt_name;
+    void *guest_fdt = data->fdt, *host_fdt;
+    const void *r;
+    int i, prop_len;
+    uint32_t *irq_attr, *reg_attr, *host_clock_phandles;
+    uint64_t mmio_base, irq_number;
+    uint32_t guest_clock_phandles[2];
+
+    host_fdt = load_device_tree_from_sysfs();
+
+    dt_name = sysfs_to_dt_name(vbasedev->name);
+    if (!dt_name) {
+        error_setg(&error_fatal, "%s incorrect sysfs device name %s",
+                    __func__, vbasedev->name);
+    }
+    node_path = qemu_fdt_node_path(host_fdt, dt_name, vdev->compat,
+                                   &error_fatal);
+    if (!node_path || !node_path[0]) {
+        error_setg(&error_fatal, "%s unable to retrieve node path for %s/%s",
+                   __func__, dt_name, vdev->compat);
     }
+
+    if (node_path[1]) {
+        error_setg(&error_fatal, "%s more than one node matching %s/%s!",
+                   __func__, dt_name, vdev->compat);
+    }
+
+    g_free(dt_name);
+
+    if (vbasedev->num_regions != 5) {
+        error_setg(&error_fatal, "%s Does the host dt node combine XGBE/PHY?",
+                   __func__);
+    }
+
+    /* generate nodes for DMA_CLK and PTP_CLK */
+    r = qemu_fdt_getprop(host_fdt, node_path[0], "clocks",
+                         &prop_len, &error_fatal);
+    if (prop_len != 8) {
+        error_setg(&error_fatal, "%s clocks property should contain 2 handles",
+                   __func__);
+    }
+    host_clock_phandles = (uint32_t *)r;
+    guest_clock_phandles[0] = qemu_fdt_alloc_phandle(guest_fdt);
+    guest_clock_phandles[1] = qemu_fdt_alloc_phandle(guest_fdt);
+
+    /**
+     * clock handles fetched from host dt are in be32 layout whereas
+     * rest of the code uses cpu layout. Also guest clock handles are
+     * in cpu layout.
+     */
+    fdt_build_clock_node(host_fdt, guest_fdt,
+                         be32_to_cpu(host_clock_phandles[0]),
+                         guest_clock_phandles[0]);
+
+    fdt_build_clock_node(host_fdt, guest_fdt,
+                         be32_to_cpu(host_clock_phandles[1]),
+                         guest_clock_phandles[1]);
+
+    /* combined XGBE/PHY node */
+    mmio_base = platform_bus_get_mmio_addr(pbus, sbdev, 0);
+    nodename = g_strdup_printf("%s/%s@%" PRIx64, parent_node,
+                               vbasedev->name, mmio_base);
+    qemu_fdt_add_subnode(guest_fdt, nodename);
+
+    copy_properties_from_host(amd_xgbe_copied_properties,
+                       ARRAY_SIZE(amd_xgbe_copied_properties),
+                       host_fdt, guest_fdt,
+                       node_path[0], nodename);
+
+    qemu_fdt_setprop_cells(guest_fdt, nodename, "clocks",
+                           guest_clock_phandles[0],
+                           guest_clock_phandles[1]);
+
+    reg_attr = g_new(uint32_t, vbasedev->num_regions * 2);
+    for (i = 0; i < vbasedev->num_regions; i++) {
+        mmio_base = platform_bus_get_mmio_addr(pbus, sbdev, i);
+        reg_attr[2 * i] = cpu_to_be32(mmio_base);
+        reg_attr[2 * i + 1] = cpu_to_be32(
+                                memory_region_size(vdev->regions[i]->mem));
+    }
+    qemu_fdt_setprop(guest_fdt, nodename, "reg", reg_attr,
+                     vbasedev->num_regions * 2 * sizeof(uint32_t));
+
+    irq_attr = g_new(uint32_t, vbasedev->num_irqs * 3);
+    for (i = 0; i < vbasedev->num_irqs; i++) {
+        irq_number = platform_bus_get_irqn(pbus, sbdev , i)
+                         + data->irq_start;
+        irq_attr[3 * i] = cpu_to_be32(GIC_FDT_IRQ_TYPE_SPI);
+        irq_attr[3 * i + 1] = cpu_to_be32(irq_number);
+        /*
+          * General device interrupt and PCS auto-negotiation interrupts are
+          * level-sensitive while the 4 per-channel interrupts are edge
+          * sensitive
+          */
+        QLIST_FOREACH(intp, &vdev->intp_list, next) {
+            if (intp->pin == i) {
+                break;
+            }
+        }
+        if (intp->flags & VFIO_IRQ_INFO_AUTOMASKED) {
+            irq_attr[3 * i + 2] = cpu_to_be32(GIC_FDT_IRQ_FLAGS_LEVEL_HI);
+        } else {
+            irq_attr[3 * i + 2] = cpu_to_be32(GIC_FDT_IRQ_FLAGS_EDGE_LO_HI);
+        }
+    }
+    qemu_fdt_setprop(guest_fdt, nodename, "interrupts",
+                     irq_attr, vbasedev->num_irqs * 3 * sizeof(uint32_t));
+
+    g_free(host_fdt);
+    g_strfreev(node_path);
     g_free(irq_attr);
-fail_reg:
     g_free(reg_attr);
     g_free(nodename);
-    return ret;
+    return 0;
 }
 
+#endif /* CONFIG_LINUX */
+
 /* list of supported dynamic sysbus devices */
 static const NodeCreationPair add_fdt_node_functions[] = {
+#ifdef CONFIG_LINUX
     {TYPE_VFIO_CALXEDA_XGMAC, add_calxeda_midway_xgmac_fdt_node},
+    {TYPE_VFIO_AMD_XGBE, add_amd_xgbe_fdt_node},
+#endif
     {"", NULL}, /* last element */
 };