From: Jeff McGee <jeff.mcgee@xxxxxxxxx>
New test pm_sseu is intended for any subtest related to the
slice/subslice/EU power gating feature. The sole initial subtest,
'full-enable', confirms that the slice/subslice/EU state is at
full enablement when the render engine is active. Starting with
Gen9 SKL, the render power gating feature can leave SSEU in a
partially enabled state upon resumption of render work unless
explicit action is taken.
v2: Add test description and apply recommendations of igt.cocci
(Thomas Wood).
v3: Skip instead of fail if debugfs entry i915_sseu_status is not
available.
Signed-off-by: Jeff McGee <jeff.mcgee@xxxxxxxxx>
---
tests/.gitignore | 1 +
tests/Makefile.sources | 1 +
tests/pm_sseu.c | 376 +++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 378 insertions(+)
create mode 100644 tests/pm_sseu.c
diff --git a/tests/.gitignore b/tests/.gitignore
index 402e062..35b3289 100644
--- a/tests/.gitignore
+++ b/tests/.gitignore
@@ -146,6 +146,7 @@ pm_lpsp
pm_rc6_residency
pm_rpm
pm_rps
+pm_sseu
prime_nv_api
prime_nv_pcopy
prime_nv_test
diff --git a/tests/Makefile.sources b/tests/Makefile.sources
index a165978..798cb75 100644
--- a/tests/Makefile.sources
+++ b/tests/Makefile.sources
@@ -86,6 +86,7 @@ TESTS_progs_M = \
pm_rpm \
pm_rps \
pm_rc6_residency \
+ pm_sseu \
prime_self_import \
template \
$(NULL)
diff --git a/tests/pm_sseu.c b/tests/pm_sseu.c
new file mode 100644
index 0000000..34465db
--- /dev/null
+++ b/tests/pm_sseu.c
@@ -0,0 +1,376 @@
+/*
+ * Copyright © 2015 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ * Authors:
+ * Jeff McGee <jeff.mcgee@xxxxxxxxx>
+ */
+
+#include <fcntl.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <time.h>
+#include "drmtest.h"
+#include "i915_drm.h"
+#include "intel_io.h"
+#include "intel_bufmgr.h"
+#include "intel_batchbuffer.h"
+#include "intel_chipset.h"
+#include "ioctl_wrappers.h"
+#include "igt_debugfs.h"
+#include "media_spin.h"
+
+IGT_TEST_DESCRIPTION("Tests slice/subslice/EU power gating functionality.\n");
+
+static double
+to_dt(const struct timespec *start, const struct timespec *end)
+{
+ double dt;
+
+ dt = (end->tv_sec - start->tv_sec) * 1e3;
+ dt += (end->tv_nsec - start->tv_nsec) * 1e-6;
+
+ return dt;
+}
+
+struct status {
+ struct {
+ int slice_total;
+ int subslice_total;
+ int subslice_per;
+ int eu_total;
+ int eu_per;
+ bool has_slice_pg;
+ bool has_subslice_pg;
+ bool has_eu_pg;
+ } info;
+ struct {
+ int slice_total;
+ int subslice_total;
+ int subslice_per;
+ int eu_total;
+ int eu_per;
+ } hw;
+};
+
+#define DBG_STATUS_BUF_SIZE 4096
+
+struct {
+ int init;
+ int status_fd;
+ char status_buf[DBG_STATUS_BUF_SIZE];
+} dbg;
+
+static void
+dbg_get_status_section(const char *title, char **first, char **last)
+{
+ char *pos;
+
+ *first = strstr(dbg.status_buf, title);
+ igt_assert(*first != NULL);
+
+ pos = *first;
+ do {
+ pos = strchr(pos, '\n');
+ igt_assert(pos != NULL);
+ pos++;
+ } while (*pos == ' '); /* lines in the section begin with a space */
+ *last = pos - 1;
+}
+
+static int
+dbg_get_int(const char *first, const char *last, const char *name)
+{
+ char *pos;
+
+ pos = strstr(first, name);
+ igt_assert(pos != NULL);
+ pos = strstr(pos, ":");
+ igt_assert(pos != NULL);
+ pos += 2;
+ igt_assert(pos != last);
+
+ return strtol(pos, &pos, 10);
+}
+
+static bool
+dbg_get_bool(const char *first, const char *last, const char *name)
+{
+ char *pos;
+
+ pos = strstr(first, name);
+ igt_assert(pos != NULL);
+ pos = strstr(pos, ":");
+ igt_assert(pos != NULL);
+ pos += 2;
+ igt_assert(pos < last);
+
+ if (*pos == 'y')
+ return true;
+ if (*pos == 'n')
+ return false;
+
+ igt_assert_f(false, "Could not read boolean value for %s.\n", name);
+ return false;
+}
+
+static void
+dbg_get_status(struct status *stat)
+{
+ char *first, *last;
+ int nread;
+
+ lseek(dbg.status_fd, 0, SEEK_SET);
+ nread = read(dbg.status_fd, dbg.status_buf, DBG_STATUS_BUF_SIZE);
+ igt_assert_lt(nread, DBG_STATUS_BUF_SIZE);
+ dbg.status_buf[nread] = '\0';
+
+ memset(stat, 0, sizeof(*stat));
+
+ dbg_get_status_section("SSEU Device Info", &first, &last);
+ stat->info.slice_total =
+ dbg_get_int(first, last, "Available Slice Total:");
+ stat->info.subslice_total =
+ dbg_get_int(first, last, "Available Subslice Total:");
+ stat->info.subslice_per =
+ dbg_get_int(first, last, "Available Subslice Per Slice:");
+ stat->info.eu_total =
+ dbg_get_int(first, last, "Available EU Total:");
+ stat->info.eu_per =
+ dbg_get_int(first, last, "Available EU Per Subslice:");
+ stat->info.has_slice_pg =
+ dbg_get_bool(first, last, "Has Slice Power Gating:");
+ stat->info.has_subslice_pg =
+ dbg_get_bool(first, last, "Has Subslice Power Gating:");
+ stat->info.has_eu_pg =
+ dbg_get_bool(first, last, "Has EU Power Gating:");
+
+ dbg_get_status_section("SSEU Device Status", &first, &last);
+ stat->hw.slice_total =
+ dbg_get_int(first, last, "Enabled Slice Total:");
+ stat->hw.subslice_total =
+ dbg_get_int(first, last, "Enabled Subslice Total:");
+ stat->hw.subslice_per =
+ dbg_get_int(first, last, "Enabled Subslice Per Slice:");
+ stat->hw.eu_total =
+ dbg_get_int(first, last, "Enabled EU Total:");
+ stat->hw.eu_per =
+ dbg_get_int(first, last, "Enabled EU Per Subslice:");
+}
+
+static void
+dbg_init(void)
+{
+ dbg.status_fd = igt_debugfs_open("i915_sseu_status", O_RDONLY);
+ igt_skip_on_f(dbg.status_fd == -1,
+ "debugfs entry 'i915_sseu_status' not found\n");
+ dbg.init = 1;
+}
+
+static void
+dbg_deinit(void)
+{
+ switch (dbg.init)
+ {
+ case 1:
+ close(dbg.status_fd);
+ }
+}
+
+struct {
+ int init;
+ int drm_fd;
+ int devid;
+ int gen;
+ int has_ppgtt;
+ drm_intel_bufmgr *bufmgr;
+ struct intel_batchbuffer *batch;
+ igt_media_spinfunc_t spinfunc;
+ struct igt_buf buf;
+ uint32_t spins_per_msec;
+} gem;
+
+static void
+gem_check_spin(uint32_t spins)
+{
+ uint32_t *data;
+
+ data = (uint32_t*)gem.buf.bo->virtual;
+ igt_assert_eq_u32(*data, spins);
+}
+
+static uint32_t
+gem_get_target_spins(double dt)
+{
+ struct timespec tstart, tdone;
+ double prev_dt, cur_dt;
+ uint32_t spins;
+ int i, ret;
+
+ /* Double increments until we bound the target time */
+ prev_dt = 0.0;
+ for (i = 0; i < 32; i++) {
+ spins = 1 << i;
+ clock_gettime(CLOCK_MONOTONIC, &tstart);
+
+ gem.spinfunc(gem.batch, &gem.buf, spins);
+ ret = drm_intel_bo_map(gem.buf.bo, 0);
+ igt_assert_eq(ret, 0);
+ clock_gettime(CLOCK_MONOTONIC, &tdone);
+
+ gem_check_spin(spins);
+ drm_intel_bo_unmap(gem.buf.bo);
+
+ cur_dt = to_dt(&tstart, &tdone);
+ if (cur_dt > dt)
+ break;
+ prev_dt = cur_dt;
+ }
+ igt_assert_neq(i, 32);
+
+ /* Linearly interpolate between i and i-1 to get target increments */
+ spins = 1 << (i-1); /* lower bound spins */
+ spins += spins * (dt - prev_dt)/(cur_dt - prev_dt); /* target spins */
+
+ return spins;
+}
+
+static void
+gem_init(void)
+{
+ gem.drm_fd = drm_open_any();
+ gem.init = 1;
+
+ gem.devid = intel_get_drm_devid(gem.drm_fd);
+ gem.gen = intel_gen(gem.devid);
+ gem.has_ppgtt = gem_uses_aliasing_ppgtt(gem.drm_fd);
+
+ gem.bufmgr = drm_intel_bufmgr_gem_init(gem.drm_fd, 4096);
+ igt_assert(gem.bufmgr);
+ gem.init = 2;
+
+ drm_intel_bufmgr_gem_enable_reuse(gem.bufmgr);
+
+ gem.batch = intel_batchbuffer_alloc(gem.bufmgr, gem.devid);
+ igt_assert(gem.batch);
+ gem.init = 3;
+
+ gem.spinfunc = igt_get_media_spinfunc(gem.devid);
+ igt_assert(gem.spinfunc);
+
+ gem.buf.stride = sizeof(uint32_t);
+ gem.buf.tiling = I915_TILING_NONE;
+ gem.buf.size = gem.buf.stride;
+ gem.buf.bo = drm_intel_bo_alloc(gem.bufmgr, "", gem.buf.size, 4096);
+ igt_assert(gem.buf.bo);
+ gem.init = 4;
+
+ gem.spins_per_msec = gem_get_target_spins(100) / 100;
+}
+
+static void
+gem_deinit(void)
+{
+ switch (gem.init)
+ {
+ case 4:
+ drm_intel_bo_unmap(gem.buf.bo);
+ drm_intel_bo_unreference(gem.buf.bo);
+ case 3:
+ intel_batchbuffer_free(gem.batch);
+ case 2:
+ drm_intel_bufmgr_destroy(gem.bufmgr);
+ case 1:
+ close(gem.drm_fd);
+ }
+}
+
+static void
+check_full_enable(struct status *stat)
+{
+ igt_assert_eq(stat->hw.slice_total, stat->info.slice_total);
+ igt_assert_eq(stat->hw.subslice_total, stat->info.subslice_total);
+ igt_assert_eq(stat->hw.subslice_per, stat->info.subslice_per);
+
+ /*
+ * EU are powered in pairs, but it is possible for one EU in the pair
+ * to be non-functional due to fusing. The determination of enabled
+ * EU does not account for this and can therefore actually exceed the
+ * available count. Allow for this small discrepancy in our
+ * comparison.
+ */
+ igt_assert_lte(stat->info.eu_total, stat->hw.eu_total);
+ igt_assert_lte(stat->info.eu_per, stat->hw.eu_per);
+}
+
+static void
+full_enable(void)
+{
+ struct status stat;
+ const int spin_msec = 10;
+ int ret, spins;
+
+ /* Simulation doesn't currently model slice/subslice/EU power gating. */
+ igt_skip_on_simulation();
+
+ /*
+ * Gen9 SKL is the first case in which render power gating can leave
+ * slice/subslice/EU in a partially enabled state upon resumption of
+ * render work. So start checking that this is prevented as of Gen9.
+ */
+ igt_require(gem.gen >= 9);
+
+ spins = spin_msec * gem.spins_per_msec;
+
+ gem.spinfunc(gem.batch, &gem.buf, spins);
+
+ usleep(2000); /* 2ms wait to make sure batch is running */
+ dbg_get_status(&stat);
+
+ ret = drm_intel_bo_map(gem.buf.bo, 0);
+ igt_assert_eq(ret, 0);
+
+ gem_check_spin(spins);
+ drm_intel_bo_unmap(gem.buf.bo);
+
+ check_full_enable(&stat);
+}
+
+static void
+exit_handler(int sig)
+{
+ gem_deinit();
+ dbg_deinit();
+}
+
+igt_main
+{
+ igt_fixture {
+ igt_install_exit_handler(exit_handler);
+
+ dbg_init();
+ gem_init();
+ }
+
+ igt_subtest("full-enable")
+ full_enable();
+}
--
2.3.3
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