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qemu-e2k/hw/arm/sysbus-fdt.c

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/*
* ARM Platform Bus device tree generation helpers
*
* Copyright (c) 2014 Linaro Limited
*
* Authors:
* Alex Graf <agraf@suse.de>
* Eric Auger <eric.auger@linaro.org>
*
* 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 or later, 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 "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"
#include "hw/platform-bus.h"
#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
*/
typedef struct PlatformBusFDTData {
void *fdt; /* device tree handle */
int irq_start; /* index of the first IRQ usable by platform bus devices */
const char *pbus_node_name; /* name of the platform bus node */
PlatformBusDevice *pbus;
} PlatformBusFDTData;
/*
* struct used when calling the machine init done notifier
* that constructs the fdt nodes of platform bus devices
*/
typedef struct PlatformBusFDTNotifierParams {
Notifier notifier;
ARMPlatformBusFDTParams *fdt_params;
} PlatformBusFDTNotifierParams;
/* struct that associates a device type name and a node creation function */
typedef struct NodeCreationPair {
const char *typename;
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 */
/**
* add_calxeda_midway_xgmac_fdt_node
*
* Generates a simple node with following properties:
* compatible string, regs, interrupts, dma-coherent
*/
static int add_calxeda_midway_xgmac_fdt_node(SysBusDevice *sbdev, void *opaque)
{
PlatformBusFDTData *data = opaque;
PlatformBusDevice *pbus = data->pbus;
void *fdt = data->fdt;
const char *parent_node = data->pbus_node_name;
int compat_str_len, i;
char *nodename;
uint32_t *irq_attr, *reg_attr;
uint64_t mmio_base, irq_number;
VFIOPlatformDevice *vdev = VFIO_PLATFORM_DEVICE(sbdev);
VFIODevice *vbasedev = &vdev->vbasedev;
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(fdt, nodename);
compat_str_len = strlen(vdev->compat) + 1;
qemu_fdt_setprop(fdt, nodename, "compatible",
vdev->compat, compat_str_len);
qemu_fdt_setprop(fdt, nodename, "dma-coherent", "", 0);
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(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);
irq_attr[3 * i + 2] = cpu_to_be32(GIC_FDT_IRQ_FLAGS_LEVEL_HI);
}
qemu_fdt_setprop(fdt, nodename, "interrupts",
irq_attr, vbasedev->num_irqs * 3 * sizeof(uint32_t));
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);
g_free(reg_attr);
g_free(nodename);
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 */
};
/* Generic Code */
/**
* add_fdt_node - add the device tree node of a dynamic sysbus device
*
* @sbdev: handle to the sysbus device
* @opaque: handle to the PlatformBusFDTData
*
* Checks the sysbus type belongs to the list of device types that
* are dynamically instantiable and if so call the node creation
* function.
*/
static void add_fdt_node(SysBusDevice *sbdev, void *opaque)
{
int i, ret;
for (i = 0; i < ARRAY_SIZE(add_fdt_node_functions); i++) {
if (!strcmp(object_get_typename(OBJECT(sbdev)),
add_fdt_node_functions[i].typename)) {
ret = add_fdt_node_functions[i].add_fdt_node_fn(sbdev, opaque);
assert(!ret);
return;
}
}
error_report("Device %s can not be dynamically instantiated",
qdev_fw_name(DEVICE(sbdev)));
exit(1);
}
/**
* add_all_platform_bus_fdt_nodes - create all the platform bus nodes
*
* builds the parent platform bus node and all the nodes of dynamic
* sysbus devices attached to it.
*/
static void add_all_platform_bus_fdt_nodes(ARMPlatformBusFDTParams *fdt_params)
{
const char platcomp[] = "qemu,platform\0simple-bus";
PlatformBusDevice *pbus;
DeviceState *dev;
gchar *node;
uint64_t addr, size;
int irq_start, dtb_size;
struct arm_boot_info *info = fdt_params->binfo;
const ARMPlatformBusSystemParams *params = fdt_params->system_params;
const char *intc = fdt_params->intc;
void *fdt = info->get_dtb(info, &dtb_size);
/*
* If the user provided a dtb, we assume the dynamic sysbus nodes
* already are integrated there. This corresponds to a use case where
* the dynamic sysbus nodes are complex and their generation is not yet
* supported. In that case the user can take charge of the guest dt
* while qemu takes charge of the qom stuff.
*/
if (info->dtb_filename) {
return;
}
assert(fdt);
node = g_strdup_printf("/platform@%"PRIx64, params->platform_bus_base);
addr = params->platform_bus_base;
size = params->platform_bus_size;
irq_start = params->platform_bus_first_irq;
/* Create a /platform node that we can put all devices into */
qemu_fdt_add_subnode(fdt, node);
qemu_fdt_setprop(fdt, node, "compatible", platcomp, sizeof(platcomp));
/* Our platform bus region is less than 32bits, so 1 cell is enough for
* address and size
*/
qemu_fdt_setprop_cells(fdt, node, "#size-cells", 1);
qemu_fdt_setprop_cells(fdt, node, "#address-cells", 1);
qemu_fdt_setprop_cells(fdt, node, "ranges", 0, addr >> 32, addr, size);
qemu_fdt_setprop_phandle(fdt, node, "interrupt-parent", intc);
dev = qdev_find_recursive(sysbus_get_default(), TYPE_PLATFORM_BUS_DEVICE);
pbus = PLATFORM_BUS_DEVICE(dev);
/* We can only create dt nodes for dynamic devices when they're ready */
assert(pbus->done_gathering);
PlatformBusFDTData data = {
.fdt = fdt,
.irq_start = irq_start,
.pbus_node_name = node,
.pbus = pbus,
};
/* Loop through all dynamic sysbus devices and create their node */
foreach_dynamic_sysbus_device(add_fdt_node, &data);
g_free(node);
}
static void platform_bus_fdt_notify(Notifier *notifier, void *data)
{
PlatformBusFDTNotifierParams *p = DO_UPCAST(PlatformBusFDTNotifierParams,
notifier, notifier);
add_all_platform_bus_fdt_nodes(p->fdt_params);
g_free(p->fdt_params);
g_free(p);
}
void arm_register_platform_bus_fdt_creator(ARMPlatformBusFDTParams *fdt_params)
{
PlatformBusFDTNotifierParams *p = g_new(PlatformBusFDTNotifierParams, 1);
p->fdt_params = fdt_params;
p->notifier.notify = platform_bus_fdt_notify;
qemu_add_machine_init_done_notifier(&p->notifier);
}
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