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xemu/hw/arm/sysbus-fdt.c
Eric Auger c294ac327c hw/arm/virt: vTPM support 
Let the TPM TIS SYSBUS device be dynamically instantiable
in ARM virt.  A device tree node is dynamically created
(TPM via MMIO).

The TPM Physical Presence interface (PPI) is not supported.

To run with the swtmp TPM emulator, the qemu command line must
be augmented with:

        -chardev socket,id=chrtpm,path=swtpm-sock \
        -tpmdev emulator,id=tpm0,chardev=chrtpm \
        -device tpm-tis-device,tpmdev=tpm0 \

swtpm/libtpms command line example:

swtpm socket --tpm2 -t -d --tpmstate dir=/tmp/tpm \
--ctrl type=unixio,path=swtpm-sock

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Stefan Berger <stefanb@linux.ibm.com>
Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Message-id: 20200305165149.618-7-eric.auger@redhat.com
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
2020-03-05 12:18:16 -05:00

568 lines
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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>
#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 "sysemu/tpm.h"
#include "hw/platform-bus.h"
#include "hw/vfio/vfio-platform.h"
#include "hw/vfio/vfio-calxeda-xgmac.h"
#include "hw/vfio/vfio-amd-xgbe.h"
#include "hw/display/ramfb.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 that allows to match a device and create its FDT node */
typedef struct BindingEntry {
const char *typename;
const char *compat;
int (*add_fn)(SysBusDevice *sbdev, void *opaque);
bool (*match_fn)(SysBusDevice *sbdev, const struct BindingEntry *combo);
} BindingEntry;
/* 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,
&err);
if (r) {
qemu_fdt_setprop(guest_fdt, nodename,
props[i].name, r, prop_len);
} else {
if (props[i].optional && prop_len == -FDT_ERR_NOTFOUND) {
/* optional property does not exist */
error_free(err);
} else {
error_report_err(err);
}
if (!props[i].optional) {
/* mandatory property not found: bail out */
exit(1);
}
err = NULL;
}
}
}
/* 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_report("not able to locate clock handle %d in host device tree",
host_phandle);
exit(1);
}
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_report("not able to retrieve node path for clock handle %d",
host_phandle);
exit(1);
}
r = qemu_fdt_getprop(host_fdt, node_path, "compatible", &prop_len,
&error_fatal);
if (strcmp(r, "fixed-clock")) {
error_report("clock handle %d is not a fixed clock", host_phandle);
exit(1);
}
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_report("%s incorrect sysfs device name %s",
__func__, vbasedev->name);
exit(1);
}
node_path = qemu_fdt_node_path(host_fdt, dt_name, vdev->compat,
&error_fatal);
if (!node_path || !node_path[0]) {
error_report("%s unable to retrieve node path for %s/%s",
__func__, dt_name, vdev->compat);
exit(1);
}
if (node_path[1]) {
error_report("%s more than one node matching %s/%s!",
__func__, dt_name, vdev->compat);
exit(1);
}
g_free(dt_name);
if (vbasedev->num_regions != 5) {
error_report("%s Does the host dt node combine XGBE/PHY?", __func__);
exit(1);
}
/* 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_report("%s clocks property should contain 2 handles", __func__);
exit(1);
}
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;
}
/* DT compatible matching */
static bool vfio_platform_match(SysBusDevice *sbdev,
const BindingEntry *entry)
{
VFIOPlatformDevice *vdev = VFIO_PLATFORM_DEVICE(sbdev);
const char *compat;
unsigned int n;
for (n = vdev->num_compat, compat = vdev->compat; n > 0;
n--, compat += strlen(compat) + 1) {
if (!strcmp(entry->compat, compat)) {
return true;
}
}
return false;
}
#define VFIO_PLATFORM_BINDING(compat, add_fn) \
{TYPE_VFIO_PLATFORM, (compat), (add_fn), vfio_platform_match}
#endif /* CONFIG_LINUX */
/*
* add_tpm_tis_fdt_node: Create a DT node for TPM TIS
*
* See kernel documentation:
* Documentation/devicetree/bindings/security/tpm/tpm_tis_mmio.txt
* Optional interrupt for command completion is not exposed
*/
static int add_tpm_tis_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;
char *nodename;
uint32_t reg_attr[2];
uint64_t mmio_base;
mmio_base = platform_bus_get_mmio_addr(pbus, sbdev, 0);
nodename = g_strdup_printf("%s/tpm_tis@%" PRIx64, parent_node, mmio_base);
qemu_fdt_add_subnode(fdt, nodename);
qemu_fdt_setprop_string(fdt, nodename, "compatible", "tcg,tpm-tis-mmio");
reg_attr[0] = cpu_to_be32(mmio_base);
reg_attr[1] = cpu_to_be32(0x5000);
qemu_fdt_setprop(fdt, nodename, "reg", reg_attr, 2 * sizeof(uint32_t));
g_free(nodename);
return 0;
}
static int no_fdt_node(SysBusDevice *sbdev, void *opaque)
{
return 0;
}
/* Device type based matching */
static bool type_match(SysBusDevice *sbdev, const BindingEntry *entry)
{
return !strcmp(object_get_typename(OBJECT(sbdev)), entry->typename);
}
#define TYPE_BINDING(type, add_fn) {(type), NULL, (add_fn), NULL}
/* list of supported dynamic sysbus bindings */
static const BindingEntry bindings[] = {
#ifdef CONFIG_LINUX
TYPE_BINDING(TYPE_VFIO_CALXEDA_XGMAC, add_calxeda_midway_xgmac_fdt_node),
TYPE_BINDING(TYPE_VFIO_AMD_XGBE, add_amd_xgbe_fdt_node),
VFIO_PLATFORM_BINDING("amd,xgbe-seattle-v1a", add_amd_xgbe_fdt_node),
#endif
TYPE_BINDING(TYPE_TPM_TIS_SYSBUS, add_tpm_tis_fdt_node),
TYPE_BINDING(TYPE_RAMFB_DEVICE, no_fdt_node),
TYPE_BINDING("", 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(bindings); i++) {
const BindingEntry *iter = &bindings[i];
if (type_match(sbdev, iter)) {
if (!iter->match_fn || iter->match_fn(sbdev, iter)) {
ret = iter->add_fn(sbdev, opaque);
assert(!ret);
return;
}
}
}
error_report("Device %s can not be dynamically instantiated",
qdev_fw_name(DEVICE(sbdev)));
exit(1);
}
void platform_bus_add_all_fdt_nodes(void *fdt, const char *intc, hwaddr addr,
hwaddr bus_size, int irq_start)
{
const char platcomp[] = "qemu,platform\0simple-bus";
PlatformBusDevice *pbus;
DeviceState *dev;
gchar *node;
assert(fdt);
node = g_strdup_printf("/platform@%"PRIx64, addr);
/* 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, bus_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);
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);
}
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