aboutsummaryrefslogtreecommitdiff
path: root/hw/arm/sysbus-fdt.c
blob: 57f94e6581b6199f70af0f33c95ed975ef8922de (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
/*
 * 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 "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/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 */

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_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);
}