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158 lines
4.2 KiB
158 lines
4.2 KiB
/*
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* Copyright © 2014 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#include "gem_ring.h"
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#include <signal.h>
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#include <sys/ioctl.h>
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#include <sys/time.h>
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#include "intel_reg.h"
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#include "drmtest.h"
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#include "ioctl_wrappers.h"
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#include "igt_dummyload.h"
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#include "igt_gt.h"
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static int __execbuf(int fd, struct drm_i915_gem_execbuffer2 *execbuf)
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{
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int err;
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err = 0;
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if (ioctl(fd, DRM_IOCTL_I915_GEM_EXECBUFFER2, execbuf))
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err = -errno;
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errno = 0;
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return err;
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}
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static void alarm_handler(int sig)
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{
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}
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static unsigned int
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__gem_measure_ring_inflight(int fd, unsigned int engine, enum measure_ring_flags flags)
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{
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struct sigaction old_sa, sa = { .sa_handler = alarm_handler };
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struct drm_i915_gem_exec_object2 obj[2];
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struct drm_i915_gem_execbuffer2 execbuf;
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const uint32_t bbe = MI_BATCH_BUFFER_END;
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unsigned int last[2]= { -1, -1 }, count;
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struct itimerval itv;
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IGT_CORK_HANDLE(cork);
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memset(obj, 0, sizeof(obj));
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obj[1].handle = gem_create(fd, 4096);
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gem_write(fd, obj[1].handle, 0, &bbe, sizeof(bbe));
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memset(&execbuf, 0, sizeof(execbuf));
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execbuf.buffers_ptr = to_user_pointer(&obj[1]);
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execbuf.buffer_count = 1;
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execbuf.flags = engine;
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gem_execbuf(fd, &execbuf);
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gem_sync(fd, obj[1].handle);
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obj[0].handle = igt_cork_plug(&cork, fd);
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execbuf.buffers_ptr = to_user_pointer(obj);
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execbuf.buffer_count = 2;
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if (flags & MEASURE_RING_NEW_CTX)
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execbuf.rsvd1 = gem_context_create(fd);
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sigaction(SIGALRM, &sa, &old_sa);
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itv.it_interval.tv_sec = 0;
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itv.it_interval.tv_usec = 1000;
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itv.it_value.tv_sec = 0;
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itv.it_value.tv_usec = 10000;
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setitimer(ITIMER_REAL, &itv, NULL);
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count = 0;
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do {
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if (__execbuf(fd, &execbuf) == 0) {
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count++;
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continue;
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}
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if (last[1] == count)
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break;
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/* sleep until the next timer interrupt (woken on signal) */
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pause();
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last[1] = last[0];
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last[0] = count;
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} while (1);
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igt_assert_eq(__execbuf(fd, &execbuf), -EINTR);
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igt_assert(count > 1);
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memset(&itv, 0, sizeof(itv));
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setitimer(ITIMER_REAL, &itv, NULL);
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sigaction(SIGALRM, &old_sa, NULL);
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igt_cork_unplug(&cork);
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gem_close(fd, obj[0].handle);
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gem_close(fd, obj[1].handle);
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if (flags & MEASURE_RING_NEW_CTX)
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gem_context_destroy(fd, execbuf.rsvd1);
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gem_quiescent_gpu(fd);
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/* Be conservative in case we must wrap later */
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return count - 1;
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}
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/**
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* gem_measure_ring_inflight:
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* @fd: open i915 drm file descriptor
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* @engine: execbuf engine flag. Use macro ALL_ENGINES to get the minimum
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* size across all physical engines.
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* @flags: flags to affect measurement:
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* - MEASURE_RING_NEW_CTX: use a new context to account for the space
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* used by the lrc init.
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*
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* This function calculates the maximum number of batches that can be inserted
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* at the same time in the ring on the selected engine.
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*
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* Returns:
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* Number of batches that fit in the ring
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*/
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unsigned int
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gem_measure_ring_inflight(int fd, unsigned int engine, enum measure_ring_flags flags)
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{
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if (engine == ALL_ENGINES) {
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unsigned int global_min = ~0u;
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for_each_physical_engine(fd, engine) {
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unsigned int engine_min = __gem_measure_ring_inflight(fd, engine, flags);
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if (engine_min < global_min)
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global_min = engine_min;
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}
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return global_min;
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}
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return __gem_measure_ring_inflight(fd, engine, flags);
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}
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