Create a benchmark for the VKMS driver. Use a KMS layout with deliberate
odd sizes to try to avoid alignment accidents and run it for FRAME_COUNT
frames flipping framebuffers in each plane.
This benchmark was suggested by Pekka Paalanen to better analyse
possible performance regression on the Virtual Kernel Modesetting(VKMS)
driver.
With this benchmark I was able to determine two performance regression:
- 322d716a3e8a ("drm/vkms: isolate pixel conversion functionality")
- cc4fd2934d41 ("drm/vkms: Isolate writeback pixel conversion functions")
Link: https://lore.kernel.org/all/20240202214527.1d97c881@ferris.localdomain/
Suggested-by: Pekka Paalanen <pekka.paalanen@xxxxxxxxxxxxx>
Acked-by: Pekka Paalanen <pekka.paalanen@xxxxxxxxxxxxx>
Signed-off-by: Arthur Grillo <arthurgrillo@xxxxxxxxxx>
---
Changes in v2:
- Zero initialize data
- Don't wrap igt_create_* functions (Juha-Pekka Heikkila)
- Add a `break;` when a pipe is found (Pekka Paalanen)
- Rename file to kms_fb_stress.c (Kamil Konieczny)
- Replace 2 by NUM_FBS (Juha-Pekka Heikkila)
- Replace license text by SPDX License (Kamil Konieczny)
- Move explanations to commit description (Kamil Konieczny)
- Require output after find_wb_output() (Pekka Paalanen & Juha-Pekka
Heikkila)
- Remove unnecessary commit (Pekka Paalanen)
- Link to v1: https://lore.kernel.org/r/20240207-bench-v1-1-7135ad426860@xxxxxxxxxx
---
benchmarks/kms_fb_stress.c | 176 +++++++++++++++++++++++++++++++++++++++++++++
benchmarks/meson.build | 1 +
2 files changed, 177 insertions(+)
diff --git a/benchmarks/kms_fb_stress.c b/benchmarks/kms_fb_stress.c
new file mode 100644
index 000000000000..af0014bed672
--- /dev/null
+++ b/benchmarks/kms_fb_stress.c
@@ -0,0 +1,176 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2024 Arthur Grillo
+ */
+
+#include "igt.h"
+
+#define FRAME_COUNT 100
+#define NUM_FBS 2
+
+struct rect_t {
+ int x, y;
+ int width, height;
+};
+
+struct plane_t {
+ igt_plane_t *base;
+ struct rect_t rect;
+ uint32_t format;
+ struct igt_fb fbs[NUM_FBS];
+};
+
+struct kms_t {
+ struct plane_t primary;
+ struct plane_t overlay_a;
+ struct plane_t overlay_b;
+ struct plane_t writeback;
+};
+
+struct data_t {
+ int fd;
+ igt_display_t display;
+ igt_output_t *wb_output;
+ drmModeModeInfo *mode;
+ struct kms_t kms;
+};
+
+static void plane_setup(struct plane_t *plane, int index)
+{
+ igt_plane_set_size(plane->base, plane->rect.width, plane->rect.height);
+ igt_plane_set_position(plane->base, plane->rect.x, plane->rect.y);
+ igt_plane_set_fb(plane->base, &plane->fbs[index]);
+}
+
+static void gen_fbs(struct data_t *data)
+{
+ struct kms_t *kms = &data->kms;
+ drmModeModeInfo *mode = igt_output_get_mode(data->wb_output);
+
+ for (int i = 0; i < NUM_FBS; i++) {
+ igt_create_color_fb(data->fd, kms->primary.rect.width, kms->primary.rect.height,
+ kms->primary.format, DRM_FORMAT_MOD_LINEAR,
+ !i, i, i,
+ &kms->primary.fbs[i]);
+
+ igt_create_color_fb(data->fd, kms->overlay_a.rect.width, kms->overlay_a.rect.height,
+ kms->overlay_a.format, DRM_FORMAT_MOD_LINEAR,
+ i, !i, i,
+ &kms->overlay_a.fbs[i]);
+
+ igt_create_color_fb(data->fd, kms->overlay_b.rect.width, kms->overlay_b.rect.height,
+ kms->overlay_b.format, DRM_FORMAT_MOD_LINEAR,
+ i, i, !i,
+ &kms->overlay_b.fbs[i]);
+
+ kms->writeback.rect.width = mode->hdisplay;
+ kms->writeback.rect.height = mode->vdisplay;
+ igt_create_fb(data->fd, kms->writeback.rect.width, kms->writeback.rect.height,
+ kms->writeback.format, DRM_FORMAT_MOD_LINEAR,
+ &kms->writeback.fbs[i]);
+ }
+}
+
+static igt_output_t *find_wb_output(struct data_t *data)
+{
+ for (int i = 0; i < data->display.n_outputs; i++) {
+ igt_output_t *output = &data->display.outputs[i];
+
+ if (output->config.connector->connector_type != DRM_MODE_CONNECTOR_WRITEBACK)
+ continue;
+
+ return output;
+
+ }
+
+ return NULL;
+}
+
+static struct kms_t default_kms = {
+ .primary = {
+ .rect = {
+ .x = 101, .y = 0,
+ .width = 3639, .height = 2161,
+ },
+ .format = DRM_FORMAT_XRGB8888,
+ },
+ .overlay_a = {
+ .rect = {
+ .x = 201, .y = 199,
+ .width = 3033, .height = 1777,
+ },
+ .format = DRM_FORMAT_XRGB16161616,
+ },
+ .overlay_b = {
+ .rect = {
+ .x = 1800, .y = 250,
+ .width = 1507, .height = 1400,
+ },
+ .format = DRM_FORMAT_ARGB8888,
+ },
+ .writeback = {
+ .rect = {
+ .x = 0, .y = 0,
+ // Size is to be determined at runtime
+ },
+ .format = DRM_FORMAT_XRGB8888,
+ },
+};
+
+
+igt_simple_main
+{
+ struct data_t data = {0};
+ enum pipe pipe = PIPE_NONE;
+
+ data.kms = default_kms;
+
+ data.fd = drm_open_driver_master(DRIVER_ANY);
+
+ igt_display_require(&data.display, data.fd);
+
+ kmstest_set_vt_graphics_mode();
+
+ igt_display_require(&data.display, data.fd);
+ igt_require(data.display.is_atomic);
+
+ igt_display_require_output(&data.display);
+
+ igt_display_reset(&data.display);
+
+ data.wb_output = find_wb_output(&data);
+ igt_require(data.wb_output);
+
+ for_each_pipe(&data.display, pipe) {
+ igt_debug("Selecting pipe %s to %s\n",
+ kmstest_pipe_name(pipe),
+ igt_output_name(data.wb_output));
+ igt_output_set_pipe(data.wb_output, pipe);
+ break;
+ }
+
+ gen_fbs(&data);
+
+ data.kms.primary.base = igt_output_get_plane_type(data.wb_output, DRM_PLANE_TYPE_PRIMARY);
+ data.kms.overlay_a.base = igt_output_get_plane_type_index(data.wb_output,
+ DRM_PLANE_TYPE_OVERLAY, 0);
+ data.kms.overlay_b.base = igt_output_get_plane_type_index(data.wb_output,
+ DRM_PLANE_TYPE_OVERLAY, 1);
+
+ for (int i = 0; i < FRAME_COUNT; i++) {
+ int fb_index = i % NUM_FBS;
+
+ plane_setup(&data.kms.primary, fb_index);
+
+ plane_setup(&data.kms.overlay_a, fb_index);
+
+ plane_setup(&data.kms.overlay_b, fb_index);
+
+ igt_output_set_writeback_fb(data.wb_output, &data.kms.writeback.fbs[fb_index]);
+
+ igt_display_commit2(&data.display, COMMIT_ATOMIC);
+ }
+
+ igt_display_fini(&data.display);
+ drm_close_driver(data.fd);
+}
diff --git a/benchmarks/meson.build b/benchmarks/meson.build
index c451268bc44f..e949e6073719 100644
--- a/benchmarks/meson.build
+++ b/benchmarks/meson.build
@@ -20,6 +20,7 @@ benchmark_progs = [
'kms_vblank',
'prime_lookup',
'vgem_mmap',
+ 'kms_fb_stress',
]
benchmarksdir = join_paths(libexecdir, 'benchmarks')
---
base-commit: c58c5fb6aa1cb7d3627a15e364816a7a2add9edc
change-id: 20240207-bench-393789eaba47
Best regards,
--
Arthur Grillo <arthurgrillo@xxxxxxxxxx>
