[Qemu-arm] [RESEND RFC 6/6] hw/arm/sysbus-fdt: enable amd-xgbe dynamic instantiation

[Eric Auger]

This patch allows the instantiation of the vfio-amd-xgbe device
from the QEMU command line (-device vfio-amd-xgbe,host="<device>").

The guest is exposed with a device tree node that combines the description
of both XGBE and PHY (representation supported from 4.2 onwards kernel):
Documentation/devicetree/bindings/net/amd-xgbe.txt.

There are 5 register regions, 6 interrupts including 4 optional
edge-sensitive per-channel interrupts.

Property values are inherited from host device tree. It is mandated
host uses device tree, dtc binary is installed, and the host also uses a
combined XGBE/PHY representation (>= 4.2 host kernel).

2 clock nodes (dma and ptp) also are created. It is mandated those clocks
are fixed on host side.

Signed-off-by: Eric Auger <address@hidden>
---
 hw/arm/sysbus-fdt.c | 171 ++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 167 insertions(+), 4 deletions(-)

diff --git a/hw/arm/sysbus-fdt.c b/hw/arm/sysbus-fdt.c
index 22e5801..b13d380 100644
--- a/hw/arm/sysbus-fdt.c
+++ b/hw/arm/sysbus-fdt.c
@@ -22,6 +22,7 @@
  */
 
 #include <libfdt.h>
+#include <linux/vfio.h>
 #include "hw/arm/sysbus-fdt.h"
 #include "qemu/error-report.h"
 #include "sysemu/device_tree.h"
@@ -29,8 +30,10 @@
 #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"
 
+
 /*
  * internal struct that contains the information to create dynamic
  * sysbus device node
@@ -120,10 +123,7 @@ static HostProperty clock_inherited_properties[] = {
  * host_phandle: phandle of the clock in host device tree
  * guest_phandle: phandle to assign to the guest node
  */
-int fdt_build_clock_node(void *host_fdt, void *guest_fdt,
-                                uint32_t host_phandle,
-                                uint32_t guest_phandle);
-int fdt_build_clock_node(void *host_fdt, void *guest_fdt,
+static int fdt_build_clock_node(void *host_fdt, void *guest_fdt,
                                 uint32_t host_phandle,
                                 uint32_t guest_phandle)
 {
@@ -166,6 +166,21 @@ out:
     return ret;
 }
 
+/**
+ * sysfs_to_dt_name
+ *
+ * convert the name found in sysfs into the node name
+ * for instance e0900000.xgmac is converted into address@hidden
+ */
+static char *sysfs_to_dt_name(const char *sysfs_name)
+{
+    gchar **substrings =  g_strsplit(sysfs_name, ".", 2);
+    char *dt_name;
+
+    dt_name = g_strdup_printf("address@hidden", substrings[1], substrings[0]);
+    return dt_name;
+}
+
 /* Device Specific Code */
 
 /**
@@ -233,9 +248,157 @@ fail_reg:
     return ret;
 }
 
+
+/* AMD xgbe properties whose values are copied/pasted from host */
+static HostProperty amd_xgbe_inherited_properties[] = {
+    {"compatible", 0},
+    {"dma-coherent", 1},
+    {"amd,per-channel-interrupt", 1},
+    {"phy-mode", 0},
+    {"mac-address", 1},
+    {"amd,speed-set", 0},
+    {"amd,serdes-blwc", 1},
+    {"amd,serdes-cdr-rate", 1},
+    {"amd,serdes-pq-skew", 1},
+    {"amd,serdes-tx-amp", 1},
+    {"amd,serdes-dfe-tap-config", 1},
+    {"amd,serdes-dfe-tap-enable", 1},
+    {"clock-names", 0},
+};
+
+/**
+ * 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)
+ */
+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, ret = -1, 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();
+    if (!host_fdt) {
+        goto stop;
+    }
+    dt_name = sysfs_to_dt_name(vbasedev->name);
+    ret = qemu_fdt_node_path(host_fdt, dt_name, vdev->compat, &node_path);
+    g_free(dt_name);
+
+    if (ret) {
+        goto stop;
+    }
+
+    /* generate nodes for DMA_CLK and PTP_CLK */
+    r = qemu_fdt_getprop(host_fdt, node_path, "clocks", &prop_len);
+    if (prop_len != 8) {
+        goto stop;
+    }
+    host_clock_phandles = (uint32_t *)r;
+    host_clock_phandles[0] = be32_to_cpu(host_clock_phandles[0]);
+    host_clock_phandles[1] = be32_to_cpu(host_clock_phandles[1]);
+    guest_clock_phandles[0] = qemu_fdt_alloc_phandle(guest_fdt);
+    guest_clock_phandles[1] = qemu_fdt_alloc_phandle(guest_fdt);
+
+    ret = fdt_build_clock_node(host_fdt, guest_fdt,
+                               host_clock_phandles[0],
+                               guest_clock_phandles[0]);
+    if (ret) {
+        goto stop;
+    }
+
+    ret = fdt_build_clock_node(host_fdt, guest_fdt,
+                               host_clock_phandles[1],
+                               guest_clock_phandles[1]);
+    if (ret) {
+        goto stop;
+    }
+
+    /* combined XGBE/PHY node */
+    mmio_base = platform_bus_get_mmio_addr(pbus, sbdev, 0);
+    nodename = g_strdup_printf("%s/address@hidden" PRIx64, parent_node,
+                               vbasedev->name, mmio_base);
+    qemu_fdt_add_subnode(guest_fdt, nodename);
+
+    inherit_properties(amd_xgbe_inherited_properties,
+                       ARRAY_SIZE(amd_xgbe_inherited_properties),
+                       host_fdt, guest_fdt,
+                       node_path, 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));
+    }
+    ret = qemu_fdt_setprop(guest_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;
+    }
+
+    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-negociation 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);
+        }
+    }
+    ret = qemu_fdt_setprop(guest_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(host_fdt);
+    g_free(node_path);
+    g_free(irq_attr);
+fail_reg:
+    g_free(reg_attr);
+    g_free(nodename);
+    return ret;
+stop:
+    exit(1);
+}
+
 /* list of supported dynamic sysbus devices */
 static const NodeCreationPair add_fdt_node_functions[] = {
     {TYPE_VFIO_CALXEDA_XGMAC, add_calxeda_midway_xgmac_fdt_node},
+    {TYPE_VFIO_AMD_XGBE, add_amd_xgbe_fdt_node},
     {"", NULL}, /* last element */
 };
 
-- 
1.8.3.2