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/*
* Copyright © 2011 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:
* Daniel Vetter <daniel.vetter@ffwll.ch>
*
*/
/*
* Testcase: Test the CS prefetch behaviour on batches
*
* Historically the batch prefetcher doesn't check whether it's crossing page
* boundaries and likes to throw up when it gets a pagefault in return for his
* over-eager behaviour. Check for this.
*
* This test for a bug where we've failed to plug a scratch pte entry into the
* very last gtt pte.
*/
#include "igt.h"
IGT_TEST_DESCRIPTION("Test the CS prefetch behaviour on batches.");
#define BATCH_SIZE 4096
struct shadow {
uint32_t handle;
struct drm_i915_gem_relocation_entry reloc;
};
int gen;
static void setup(int fd, struct shadow *shadow)
{
uint32_t *cpu;
int i = 0;
shadow->handle = gem_create(fd, 4096);
cpu = gem_mmap__cpu(fd, shadow->handle, 0, 4096, PROT_WRITE);
gem_set_domain(fd, shadow->handle,
I915_GEM_DOMAIN_CPU, I915_GEM_DOMAIN_CPU);
cpu[i++] = MI_STORE_DWORD_IMM;
if (gen >= 8) {
cpu[i++] = BATCH_SIZE - sizeof(uint32_t);
cpu[i++] = 0;
} else if (gen >= 4) {
cpu[i++] = 0;
cpu[i++] = BATCH_SIZE - sizeof(uint32_t);
} else {
cpu[i-1]--;
cpu[i-1] |= 1 << 22;
cpu[i++] = BATCH_SIZE - sizeof(uint32_t);
}
cpu[i++] = MI_BATCH_BUFFER_END;
cpu[i++] = MI_BATCH_BUFFER_END;
munmap(cpu, 4096);
memset(&shadow->reloc, 0, sizeof(shadow->reloc));
if (gen >= 8 || gen < 4)
shadow->reloc.offset = sizeof(uint32_t);
else
shadow->reloc.offset = 2*sizeof(uint32_t);
shadow->reloc.delta = BATCH_SIZE - sizeof(uint32_t);
shadow->reloc.read_domains = I915_GEM_DOMAIN_INSTRUCTION;
shadow->reloc.write_domain = I915_GEM_DOMAIN_INSTRUCTION;
}
static uint32_t new_batch(int fd, struct shadow *shadow)
{
struct drm_i915_gem_execbuffer2 execbuf;
struct drm_i915_gem_exec_object2 gem_exec[2];
memset(gem_exec, 0, sizeof(gem_exec));
gem_exec[0].handle = gem_create(fd, BATCH_SIZE);
gem_exec[1].handle = shadow->handle;
shadow->reloc.target_handle = gem_exec[0].handle;
gem_exec[1].relocs_ptr = (uintptr_t)&shadow->reloc;
gem_exec[1].relocation_count = 1;
memset(&execbuf, 0, sizeof(execbuf));
execbuf.buffers_ptr = (uintptr_t)gem_exec;
execbuf.buffer_count = 2;
if (gen < 4)
execbuf.flags |= I915_EXEC_SECURE;
gem_execbuf(fd, &execbuf);
return gem_exec[0].handle;
}
static void exec(int fd, uint32_t handle)
{
struct drm_i915_gem_execbuffer2 execbuf;
struct drm_i915_gem_exec_object2 gem_exec[1];
memset(gem_exec, 0, sizeof(gem_exec));
gem_exec[0].handle = handle;
memset(&execbuf, 0, sizeof(execbuf));
execbuf.buffers_ptr = (uintptr_t)gem_exec;
execbuf.buffer_count = 1;
execbuf.batch_start_offset = 0;
execbuf.batch_len = BATCH_SIZE;
gem_execbuf(fd, &execbuf);
}
igt_simple_main
{
struct shadow shadow;
uint64_t i, count;
int fd;
igt_skip_on_simulation();
fd = drm_open_driver_master(DRIVER_INTEL);
gen = intel_gen(intel_get_drm_devid(fd));
setup(fd, &shadow);
count = gem_aperture_size(fd) / BATCH_SIZE;
intel_require_memory(count, BATCH_SIZE, CHECK_RAM);
/* Fill the entire gart with batches and run them. */
for (i = 0; i < count; i++) {
/* Launch the newly created batch... */
exec(fd, new_batch(fd, &shadow));
/* ...and leak the handle to consume the GTT */
igt_progress("gem_cs_prefetch: ", i, count);
}
igt_info("Test suceeded, cleanup up - this might take a while.\n");
close(fd);
}
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