From 131d44e083925f35f842114b6f7b6db546f28368 Mon Sep 17 00:00:00 2001 From: Arthur Hanson Rasmusson Date: Wed, 11 Nov 2026 00:23:21 -0500 Subject: vgsp: all-ones scrub release for registered waits; walk-page registration; GL frame publisher (CONT.416-417) - gsp_sema_service: merge a scanner registration arriving after the stash record instead of dropping it (a dropped registration let the next authoring pass write the blocking pair into the page the guest was polling, so the wait never ended); author the finish word all-ones for every registered record while the sema word stays put-based once real submissions were observed (CONT.416/417). - scrub_pin_qmp (host scanner): accept an unstable-but-live wait page instead of skipping it, and register the walk-resolved scrubber channel page - first the walk summary, then the per-VAS kernel row (h=0xc) when the summary path fails - so the release is armed before the guest polls (r1762/r1764 evidence). - guest-diag: add gl_frames, the direct-GL (GLX pbuffer) frame publisher; with it the stack produced the first non-black GPU-rendered frames (40/40, 640x480, animated) through pbuffer -> sysmem -> ivshmem -> host frame_reader. - gsp_rm_emulation: log the display-shim request words for triage. --- tools/guest-diag/gl_frames.c | 237 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 237 insertions(+) create mode 100644 tools/guest-diag/gl_frames.c (limited to 'tools/guest-diag/gl_frames.c') diff --git a/tools/guest-diag/gl_frames.c b/tools/guest-diag/gl_frames.c new file mode 100644 index 0000000..d442d66 --- /dev/null +++ b/tools/guest-diag/gl_frames.c @@ -0,0 +1,237 @@ +// SPDX-License-Identifier: BSD-3-Clause +/* + * gl_frames.c - render animated frames with direct GL (GLX pbuffer) on the + * guest's NVIDIA vGPU and publish them into the ivshmem (kvmfr) BAR so the + * host can see what the GL client actually rendered. + * + * This is the GL sibling of tools/cuda-ab/frame_producer.cu: the transport + * (guest GPU -> guest sysmem -> ivshmem -> host frame_reader.py) is identical, + * but the pixels come from the direct-GL client channel instead of CUDA. + * The pbuffer avoids the X window draw path that wedges the X server. + * + * Layout at BAR offset 0x100000 (same as frame_producer.cu): + * struct frame_hdr { magic, version, width, height, stride, format, seq } + * then width*height*4 bytes of RGBA8. + * + * Usage: sudo ./gl_frames [frames] [width] [height] [fps] + * Prints: FRAME seq= ms= + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define FRAME_OFFSET 0x100000UL +#define HDR_MAGIC 0x4b564d46u /* "FMVK" little-endian-ish */ +#define BAR_BYTES (128UL << 20) +#define BAR_PATH_DEF "/sys/bus/pci/devices/0000:00:04.0/resource2" + +struct frame_hdr { + uint32_t magic; + uint32_t version; + uint32_t width; + uint32_t height; + uint32_t stride; + uint32_t format; /* 0 = RGBA8 */ + uint32_t seq; + uint32_t reserved; + uint64_t timestamp_ns; +}; + +/* + * The ivshmem kvmfr device moves with the QEMU topology (it was 00:03.0 in an + * older launch, 00:04.0 in the current one). Discover the 128 MiB BAR instead + * of hardcoding a slot; GL_FRAMES_BAR overrides for debugging. + */ +static const char *find_bar(char *buf, size_t len) +{ + glob_t g; + size_t i; + const char *hit = NULL; + + if (glob("/sys/bus/pci/devices/*/resource2", 0, NULL, &g) != 0) + return NULL; + for (i = 0; i < g.gl_pathc; i++) { + struct stat st; + + if (stat(g.gl_pathv[i], &st) == 0 && + (unsigned long long)st.st_size == BAR_BYTES) { + snprintf(buf, len, "%s", g.gl_pathv[i]); + hit = buf; + break; + } + } + globfree(&g); + return hit; +} + +static uint64_t now_ns(void) +{ + struct timespec ts; + + clock_gettime(CLOCK_MONOTONIC, &ts); + return (uint64_t)ts.tv_sec * 1000000000ull + ts.tv_nsec; +} + +static void draw_frame(int f, int w, int h) +{ + float a = (float)f * 0.15f; + int i; + + glViewport(0, 0, w, h); + glClearColor(0.05f, 0.05f, 0.10f, 1.0f); + glClear(GL_COLOR_BUFFER_BIT); + + glMatrixMode(GL_PROJECTION); + glLoadIdentity(); + glOrtho(-1.0, 1.0, -1.0, 1.0, -1.0, 1.0); + glMatrixMode(GL_MODELVIEW); + glLoadIdentity(); + + for (i = 0; i < 8; i++) { + float t = a + (float)i * 0.78539816339f; + + glBegin(GL_TRIANGLES); + glColor3f(1.0f, 0.2f + 0.09f * i, 0.1f); + glVertex2f(0.0f, 0.0f); + glColor3f(0.1f, 0.9f, 0.3f); + glVertex2f(0.75f * cosf(t), 0.75f * sinf(t)); + glColor3f(0.2f, 0.3f, 1.0f); + glVertex2f(0.55f * cosf(t + 0.5f), + 0.55f * sinf(t + 0.5f)); + glEnd(); + } + glFinish(); +} + +int main(int argc, char **argv) +{ + int frames = argc > 1 ? atoi(argv[1]) : 30; + int w = argc > 2 ? atoi(argv[2]) : 640; + int h = argc > 3 ? atoi(argv[3]) : 480; + int fps = argc > 4 ? atoi(argv[4]) : 5; + static int attribs[] = { + GLX_DRAWABLE_TYPE, GLX_PBUFFER_BIT, + GLX_RENDER_TYPE, GLX_RGBA_BIT, + GLX_RED_SIZE, 8, GLX_GREEN_SIZE, 8, GLX_BLUE_SIZE, 8, + GLX_ALPHA_SIZE, 8, + None + }; + GLXFBConfig *fb; + GLXPbuffer pb; + XVisualInfo *vi; + GLXContext ctx; + Display *d; + int scr, n = 0, fd, i; + unsigned char *bar, *px; + struct frame_hdr *hdr; + volatile uint32_t *seqp; + + char found[256]; + const char *bar_path = getenv("GL_FRAMES_BAR"); + + setvbuf(stdout, NULL, _IONBF, 0); + if (!bar_path) + bar_path = find_bar(found, sizeof(found)); + if (!bar_path) + bar_path = BAR_PATH_DEF; + printf("BAR %s\n", bar_path); + fd = open(bar_path, O_RDWR | O_SYNC); + if (fd < 0) { + printf("OPEN_FAIL %s\n", bar_path); + return 1; + } + bar = (unsigned char *)mmap(NULL, BAR_BYTES, PROT_READ | PROT_WRITE, + MAP_SHARED, fd, 0); + if (bar == MAP_FAILED) { + printf("MMAP_FAIL\n"); + return 1; + } + hdr = (struct frame_hdr *)(bar + FRAME_OFFSET); + seqp = &hdr->seq; + + d = XOpenDisplay(NULL); + if (!d) { + printf("NODISPLAY\n"); + return 2; + } + scr = DefaultScreen(d); + fb = glXChooseFBConfig(d, scr, attribs, &n); + if (!fb || n < 1) { + printf("NOFBCONFIG\n"); + return 3; + } + pb = glXCreatePbuffer(d, fb[0], (int[]){ + GLX_PBUFFER_WIDTH, w, GLX_PBUFFER_HEIGHT, h, None }); + if (!pb) { + printf("NOPBUFFER\n"); + return 4; + } + vi = glXGetVisualFromFBConfig(d, fb[0]); + ctx = glXCreateContext(d, vi, NULL, True); + if (!ctx) { + printf("NOCTX\n"); + return 5; + } + if (!glXMakeCurrent(d, pb, ctx)) { + printf("MAKECURRENT_FAIL\n"); + return 6; + } + printf("GL %s | %s\n", (const char *)glGetString(GL_VENDOR), + (const char *)glGetString(GL_RENDERER)); + + px = (unsigned char *)malloc((size_t)w * h * 4); + if (!px) { + printf("HOST_ALLOC_FAIL\n"); + return 7; + } + + hdr->magic = HDR_MAGIC; + hdr->version = 1; + hdr->width = (uint32_t)w; + hdr->height = (uint32_t)h; + hdr->stride = (uint32_t)w * 4; + hdr->format = 0; + + for (i = 0; i < frames; i++) { + uint64_t t0 = now_ns(); + uint32_t seq; + + draw_frame(i, w, h); + glReadPixels(0, 0, w, h, GL_RGBA, GL_UNSIGNED_BYTE, px); + if (glGetError() != GL_NO_ERROR) + printf("GL_ERROR frame=%d\n", i); + memcpy(bar + FRAME_OFFSET + sizeof(struct frame_hdr), px, + (size_t)w * h * 4); + hdr->timestamp_ns = now_ns(); + __sync_synchronize(); + seq = (uint32_t)(i + 1); + *seqp = seq; + __sync_synchronize(); + printf("FRAME seq=%u ms=%.1f px0=%02x%02x%02x%02x\n", seq, + (double)(now_ns() - t0) / 1e6, + px[0], px[1], px[2], px[3]); + if (fps > 0) + usleep((useconds_t)(1000000 / fps)); + } + printf("FRAME_DONE frames=%d %dx%d\n", frames, w, h); + + glXMakeCurrent(d, None, NULL); + glXDestroyContext(d, ctx); + glXDestroyPbuffer(d, pb); + XCloseDisplay(d); + free(px); + munmap(bar, BAR_BYTES); + close(fd); + return 0; +} -- cgit v1.2.3