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 <eric.au...@linaro.org>
---
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 xgmac@e0900000
+ */
+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("%s@%s", 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/%s@%" 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
