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/* SPDX-License-Identifier: BSD-3-Clause */
/* Copyright (c) 2026 Open-IOV contributors */
/* panel.c - rmtop sampling (read-only RM + /proc) and plain rendering. */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "rmtop.h"
static int pick_gpu(struct rm_ctx *ctx, struct rmtop_state *st)
{
struct rm_gpu_desc gpus[RM_MAX_GPUS];
const struct rm_gpu_desc *g = NULL;
int n, i;
n = rm_scan_gpus(gpus, RM_MAX_GPUS);
if (n <= 0) {
st->gpu_minor = ctx->gpu_minor;
return n;
}
for (i = 0; i < n; i++) {
if (gpus[i].minor == ctx->gpu_minor)
g = &gpus[i];
}
if (g == NULL)
g = &gpus[0];
st->gpu_minor = g->minor;
snprintf(st->model, sizeof(st->model), "%s", g->model);
snprintf(st->bdf, sizeof(st->bdf), "%s", g->bdf);
snprintf(st->uuid, sizeof(st->uuid), "%s", g->uuid);
return n;
}
static void read_driver_version(struct rmtop_state *st)
{
FILE *fh = fopen("/proc/driver/nvidia/version", "r");
st->driver[0] = '\0';
if (fh == NULL)
return;
if (fgets(st->driver, sizeof(st->driver), fh) != NULL)
st->driver[strcspn(st->driver, "\r\n")] = '\0';
fclose(fh);
}
int rmtop_collect(struct rm_ctx *ctx, struct rmtop_state *st)
{
NV2080_CTRL_MC_ARCH_INFO_PARAMS arch;
NV2080_CTRL_GPU_GET_ENGINES_V2_PARAMS engines;
NV2080_CTRL_TIMER_GET_TIME_PARAMS timer;
NV2080_FIFO_DEVICE_ENTRY *fifo;
NvU32 fb_indices[6] = {
NV2080_CTRL_FB_INFO_INDEX_TOTAL_RAM_SIZE,
NV2080_CTRL_FB_INFO_INDEX_USABLE_RAM_SIZE,
NV2080_CTRL_FB_INFO_INDEX_HEAP_SIZE,
NV2080_CTRL_FB_INFO_INDEX_HEAP_FREE,
NV2080_CTRL_FB_INFO_INDEX_BAR1_SIZE,
NV2080_CTRL_FB_INFO_INDEX_BAR1_AVAIL_SIZE,
};
NvU32 fb_values[6] = { 0 };
NvU32 n_fifo = 0;
unsigned int i;
memset(st, 0, sizeof(*st));
st->gpu_minor = ctx->gpu_minor;
st->sampled_at = time(NULL);
read_driver_version(st);
pick_gpu(ctx, st);
st->rm_rc = rm_ctx_open(ctx);
if (st->rm_rc != 0)
return 0;
st->have_rm = 1;
st->gpu_minor = ctx->rm.gpu_minor;
if (rm_query_name(ctx, st->rm_name, sizeof(st->rm_name)) != 0)
snprintf(st->rm_name, sizeof(st->rm_name), "%s", "-");
memset(&arch, 0, sizeof(arch));
if (rm_query_mc_arch(ctx, &arch) == 0) {
st->mc_arch = arch.architecture;
st->mc_impl = arch.implementation;
st->mc_rev = arch.revision;
st->mc_subrev = arch.subRevision;
}
if (rm_query_fb(ctx, fb_indices, fb_values, 6) == 0) {
st->vram_total_kib = fb_values[0];
st->vram_usable_kib = fb_values[1];
st->heap_size_kib = fb_values[2];
st->heap_free_kib = fb_values[3];
st->bar1_size_kib = fb_values[4];
st->bar1_avail_kib = fb_values[5];
}
memset(&timer, 0, sizeof(timer));
{
int ioctl_ret;
if (rm_control(&ctx->rm, ctx->rm.hSubdevice,
NV2080_CTRL_CMD_TIMER_GET_TIME, &timer,
sizeof(timer), &ioctl_ret) == 0 &&
ioctl_ret == 0) {
st->timer_nsec = timer.time_nsec;
st->have_timer = 1;
}
}
memset(&engines, 0, sizeof(engines));
if (rm_query_engines(ctx, &engines) == 0) {
st->engine_count = engines.engineCount;
if (st->engine_count > RMTOP_MAX_ENGINES)
st->engine_count = RMTOP_MAX_ENGINES;
for (i = 0; i < st->engine_count; i++)
st->engine_list[i] = engines.engineList[i];
}
fifo = calloc(1, sizeof(*fifo) * 512);
if (fifo != NULL) {
rm_query_fifo_table(ctx, fifo, 512, &n_fifo);
for (i = 0; i < st->engine_count; i++) {
snprintf(st->engine_names[i],
sizeof(st->engine_names[i]), "%s",
rm_engine_name(fifo, n_fifo,
st->engine_list[i]));
}
st->engine_names_ok = st->engine_count > 0;
free(fifo);
}
return 0;
}
void rmtop_render_plain(const struct rmtop_state *st, enum rm_format format)
{
struct rm_kv kv[16];
char v[16][160];
char human[32], human2[32];
char when[32];
struct tm tm;
int n = 0;
if (format != RM_FMT_TABLE)
goto build;
printf("rmtop %s - read-only GPU dashboard (one-shot)\n",
RMTOP_VERSION);
printf("sampled %s", ctime(&st->sampled_at));
build:
kv[n].key = "gpu_minor";
snprintf(v[n], sizeof(v[n]), "%d", st->gpu_minor);
kv[n].value = v[n];
n++;
kv[n].key = "model";
kv[n].value = st->model[0] ? st->model : "-";
n++;
kv[n].key = "driver";
kv[n].value = st->driver[0] ? st->driver : "-";
n++;
kv[n].key = "bus";
kv[n].value = st->bdf[0] ? st->bdf : "-";
n++;
kv[n].key = "uuid";
kv[n].value = st->uuid[0] ? st->uuid : "-";
n++;
kv[n].key = "rm_name";
kv[n].value = st->have_rm && st->rm_name[0] ? st->rm_name : "-";
n++;
kv[n].key = "rm_client";
snprintf(v[n], sizeof(v[n]), "%s",
st->have_rm ? "ok" : "unavailable");
kv[n].value = v[n];
n++;
if (st->have_rm) {
snprintf(v[n], sizeof(v[n]), "%s (0x%x/0x%x rev %u)",
rm_arch_str(st->mc_arch), st->mc_arch,
st->mc_impl, st->mc_rev);
kv[n].key = "arch";
kv[n].value = v[n];
n++;
}
rm_human_kib(st->vram_total_kib, human, sizeof(human));
rm_human_kib(st->vram_usable_kib, human2, sizeof(human2));
snprintf(v[n], sizeof(v[n]), "%u KiB (%s) / usable %u KiB (%s)",
st->vram_total_kib, human, st->vram_usable_kib, human2);
kv[n].key = "vram";
kv[n].value = v[n];
n++;
rm_human_kib(st->heap_free_kib, human, sizeof(human));
rm_human_kib(st->heap_size_kib, human2, sizeof(human2));
snprintf(v[n], sizeof(v[n]), "free %u KiB (%s) / heap %u KiB (%s)",
st->heap_free_kib, human, st->heap_size_kib, human2);
kv[n].key = "vram_free";
kv[n].value = v[n];
n++;
rm_human_kib(st->bar1_size_kib, human, sizeof(human));
rm_human_kib(st->bar1_avail_kib, human2, sizeof(human2));
snprintf(v[n], sizeof(v[n]), "size %u KiB (%s), avail %u KiB (%s)",
st->bar1_size_kib, human, st->bar1_avail_kib, human2);
kv[n].key = "bar1";
kv[n].value = v[n];
n++;
if (st->have_timer) {
time_t secs = (time_t)(st->timer_nsec / 1000000000ULL);
gmtime_r(&secs, &tm);
strftime(when, sizeof(when), "%Y-%m-%dT%H:%M:%S", &tm);
snprintf(v[n], sizeof(v[n]), "%llu ns (%s.%09lluZ)",
(unsigned long long)st->timer_nsec, when,
(unsigned long long)(st->timer_nsec % 1000000000ULL));
kv[n].key = "gpu_timer";
kv[n].value = v[n];
n++;
}
{
size_t off = 0;
unsigned int i;
v[n][0] = '\0';
for (i = 0; i < st->engine_count && off < sizeof(v[n]) - 2;
i++) {
const char *name = st->engine_names_ok ?
st->engine_names[i] : "engine";
off += (size_t)snprintf(v[n] + off,
sizeof(v[n]) - off, "%s%s",
i ? " " : "", name);
}
kv[n].key = "engines";
kv[n].value = v[n][0] ? v[n] : "-";
n++;
}
kv[n].key = "live_util_power_thermal";
kv[n].value = "n/a (read-only minimal build; see docs/17)";
n++;
rm_print_kv("rmtop", kv, n, format);
}
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