// SPDX-License-Identifier: MIT
/*
* Copyright © 2019 Intel Corporation
*/
#include "gt/intel_engine_pm.h"
#include "gt/intel_gpu_commands.h"
#include "i915_selftest.h"
#include "gem/selftests/igt_gem_utils.h"
#include "gem/selftests/mock_context.h"
#include "selftests/igt_reset.h"
#include "selftests/igt_spinner.h"
#include "selftests/intel_scheduler_helpers.h"
struct live_mocs {
struct drm_i915_mocs_table table;
struct drm_i915_mocs_table *mocs;
struct drm_i915_mocs_table *l3cc;
struct i915_vma *scratch;
void *vaddr;
};
static struct intel_context *mocs_context_create(struct intel_engine_cs *engine)
{
struct intel_context *ce;
ce = intel_context_create(engine);
if (IS_ERR(ce))
return ce;
/* We build large requests to read the registers from the ring */
ce->ring_size = SZ_16K;
return ce;
}
static int request_add_sync(struct i915_request *rq, int err)
{
i915_request_get(rq);
i915_request_add(rq);
if (i915_request_wait(rq, 0, HZ / 5) < 0)
err = -ETIME;
i915_request_put(rq);
return err;
}
static int request_add_spin(struct i915_request *rq, struct igt_spinner *spin)
{
int err = 0;
i915_request_get(rq);
i915_request_add(rq);
if (spin && !igt_wait_for_spinner(spin, rq))
err = -ETIME;
i915_request_put(rq);
return err;
}
static int live_mocs_init(struct live_mocs *arg, struct intel_gt *gt)
{
unsigned int flags;
int err;
memset(arg, 0, sizeof(*arg));
flags = get_mocs_settings(gt->i915, &arg->table);
if (!flags)
return -EINVAL;
if (flags & HAS_RENDER_L3CC)
arg->l3cc = &arg->table;
if (flags & (HAS_GLOBAL_MOCS | HAS_ENGINE_MOCS))
arg->mocs = &arg->table;
arg->scratch =
__vm_create_scratch_for_read_pinned(>->ggtt->vm, PAGE_SIZE);
if (IS_ERR(arg->scratch))
return PTR_ERR(arg->scratch);
arg->vaddr = i915_gem_object_pin_map_unlocked(arg->scratch->obj, I915_MAP_WB);
if (IS_ERR(arg->vaddr)) {
err = PTR_ERR(arg->vaddr);
goto err_scratch;
}
return 0;
err_scratch:
i915_vma_unpin_and_release(&arg->scratch, 0);
return err;
}
static void live_mocs_fini(struct live_mocs *arg)
{
i915_vma_unpin_and_release(&arg->scratch, I915_VMA_RELEASE_MAP);
}
static int read_regs(struct i915_request *rq,
u32 addr, unsigned int count,
u32 *offset)
{
unsigned int i;
u32 *cs;
GEM_BUG_ON(!IS_ALIGNED(*offset, sizeof(u32)));
cs = intel_ring_begin(rq, 4 * count);
if (IS_ERR(cs))
return PTR_ERR(cs);
for (i = 0; i < count; i++) {
*cs++ = MI_STORE_REGISTER_MEM_GEN8 | MI_USE_GGTT;
*cs++ = addr;
*cs++ = *offset;
*cs++ = 0;
addr += sizeof(u32);
*offset += sizeof(u32);
}
intel_ring_advance(rq, cs);
return 0;
}
static int read_mocs_table(struct i915_request *rq,
const struct drm_i915_mocs_table *table,
u32 *offset)
{
struct intel_gt *gt = rq->engine->gt;
u32 addr;
if (!table)
return 0;
if (HAS_GLOBAL_MOCS_REGISTERS(rq->i915))
addr = global_mocs_offset() + gt->uncore->gsi_offset;
else
addr = mocs_offset(rq->engine);
return read_regs(rq, addr, table->n_entries, offset);
}
static int read_l3cc_table(struct i915_request *rq,
const struct drm_i915_mocs_table *table,
u32 *offset)
{
u32 addr = i915_mmio_reg_offset(GEN9_LNCFCMOCS(0));
if (!table)
return 0;
return read_regs(rq, addr, (table->n_entries + 1) / 2, offset);
}
static int check_mocs_table(struct intel_engine_cs *engine,
const struct drm_i915_mocs_table *table,
u32 **vaddr)
{
unsigned int i;
u32 expect;
if (!table)
return 0;
for_each_mocs(expect, table, i) {
if (**vaddr != expect) {
pr_err("%s: Invalid MOCS[%d] entry, found %08x, expected %08x\n",
engine->name, i, **vaddr, expect);
return -EINVAL;
}
++*vaddr;
}
return 0;
}
static bool mcr_range(struct drm_i915_private *i915, u32 offset)
{
/*
* Registers in this range are affected by the MCR selector
* which only controls CPU initiated MMIO. Routing does not
* work for CS access so we cannot verify them on this path.
*/
return GRAPHICS_VER(i915) >= 8 && offset >= 0xb000 && offset <= 0xb4ff;
}
static int check_l3cc_table(struct intel_engine_cs *engine,
const struct drm_i915_mocs_table *table,
u32 **vaddr)
{
/* Can we read the MCR range 0xb00 directly? See intel_workarounds! */
u32 reg = i915_mmio_reg_offset(GEN9_LNCFCMOCS(0));
unsigned int i;
u32 expect;
if (!table)
return 0;
for_each_l3cc(expect, table, i) {
if (!mcr_range(engine->i915, reg) && **vaddr != expect) {
pr_err("%s: Invalid L3CC[%d] entry, found %08x, expected %08x\n",
engine->name, i, **vaddr, expect);
return -EINVAL;
}
++*vaddr;
reg += 4;
}
return 0;
}
static int check_mocs_engine(struct live_mocs *arg,
struct intel_context *ce)
{
struct i915_vma *vma = arg->scratch;
struct i915_request *rq;
u32 offset;
u32 *vaddr;
int err;
memset32(arg->vaddr, STACK_MAGIC, PAGE_SIZE / sizeof(u32));
rq = intel_context_create_request(ce);
if (IS_ERR(rq))
return PTR_ERR(rq);
err = igt_vma_move_to_active_unlocked(vma, rq, EXEC_OBJECT_WRITE);
/* Read the mocs tables back using SRM */
offset = i915_ggtt_offset(vma);
if (!err)
err = read_mocs_table(rq, arg->mocs, &offset);
if (!err && ce->engine->class == RENDER_CLASS)
err = read_l3cc_table(rq, arg->l3cc, &offset);
offset -= i915_ggtt_offset(vma);
GEM_BUG_ON(offset > PAGE_SIZE);
err = request_add_sync(rq, err);
if (err)
return err;
/* Compare the results against the expected tables */
vaddr = arg->vaddr;
if (!err)
err = check_mocs_table(ce->engine, arg->mocs, &vaddr);
if (!err && ce->engine->class == RENDER_CLASS)
err = check_l3cc_table(ce->engine, arg->l3cc, &vaddr);
if (err)
return err;
GEM_BUG_ON(arg->vaddr + offset != vaddr);
return 0;
}
static int live_mocs_kernel(void *arg)
{
struct intel_gt *gt = arg;
struct intel_engine_cs *engine;
enum intel_engine_id id;
struct live_mocs mocs;
int err;
/* Basic check the system is configured with the expected mocs table */
err = live_mocs_init(&mocs, gt);
if (err)
return err;
for_each_engine(engine, gt, id) {
intel_engine_pm_get(engine);
err = check_mocs_engine(&mocs, engine->kernel_context);
intel_engine_pm_put(engine);
if (err)
break;
}
live_mocs_fini(&mocs);
return err;
}
static int live_mocs_clean(void *arg)
{
struct intel_gt *gt = arg;
struct intel_engine_cs *engine;
enum intel_engine_id id;
struct live_mocs mocs;
int err;
/* Every new context should see the same mocs table */
err = live_mocs_init(&mocs, gt);
if (err)
return err;
for_each_engine(engine, gt, id) {
struct intel_context *ce;
ce = mocs_context_create(engine);
if (IS_ERR(ce)) {
err = PTR_ERR(ce);
break;
}
err = check_mocs_engine(&mocs, ce);
intel_context_put(ce);
if (err)
break;
}
live_mocs_fini(&mocs);
return err;
}
static int active_engine_reset(struct intel_context *ce,
const char *reason,
bool using_guc)
{
struct igt_spinner spin;
struct i915_request *rq;
int err;
err = igt_spinner_init(&spin, ce->engine->gt);
if (err)
return err;
rq = igt_spinner_create_request(&spin, ce, MI_NOOP);
if (IS_ERR(rq)) {
igt_spinner_fini(&spin);
return PTR_ERR(rq);
}
err = request_add_spin(rq, &spin);
if (err == 0 && !using_guc)
err = intel_engine_reset(ce->engine, reason);
/* Ensure the reset happens and kills the engine */
if (err == 0)
err = intel_selftest_wait_for_rq(rq);
igt_spinner_end(&spin);
igt_spinner_fini(&spin);
return err;
}
static int __live_mocs_reset(struct live_mocs *mocs,
struct intel_context *ce, bool using_guc)
{
struct intel_gt *gt = ce->engine->gt;
int err;
if (intel_has_reset_engine(gt)) {
if (!using_guc) {
err = intel_engine_reset(ce->engine, "mocs");
if (err)
return err;
err = check_mocs_engine(mocs, ce);
if (err)
return err;
}
err = active_engine_reset(ce, "mocs", using_guc);
if (err)
return err;
err = check_mocs_engine(mocs, ce);
if (err)
return err;
}
if (intel_has_gpu_reset(gt)) {
intel_gt_reset(gt, ce->engine->mask, "mocs");
err = check_mocs_engine(mocs, ce);
if (err)
return err;
}
return 0;
}
static int live_mocs_reset(void *arg)
{
struct intel_gt *gt = arg;
struct intel_engine_cs *engine;
enum intel_engine_id id;
struct live_mocs mocs;
int err = 0;
/* Check the mocs setup is retained over per-engine and global resets */
err = live_mocs_init(&mocs, gt);
if (err)
return err;
igt_global_reset_lock(gt);
for_each_engine(engine, gt, id) {
bool using_guc = intel_engine_uses_guc(engine);
struct intel_selftest_saved_policy saved;
struct intel_context *ce;
int err2;
err = intel_selftest_modify_policy(engine, &saved,
SELFTEST_SCHEDULER_MODIFY_FAST_RESET);
if (err)
break;
ce = mocs_context_create(engine);
if (IS_ERR(ce)) {
err = PTR_ERR(ce);
goto restore;
}
intel_engine_pm_get(engine);
err = __live_mocs_reset(&mocs, ce, using_guc);
intel_engine_pm_put(engine);
intel_context_put(ce);
restore:
err2 = intel_selftest_restore_policy(engine, &saved);
if (err == 0)
err = err2;
if (err)
break;
}
igt_global_reset_unlock(gt);
live_mocs_fini(&mocs);
return err;
}
int intel_mocs_live_selftests(struct drm_i915_private *i915)
{
static const struct i915_subtest tests[] = {
SUBTEST(live_mocs_kernel),
SUBTEST(live_mocs_clean),
SUBTEST(live_mocs_reset),
};
struct drm_i915_mocs_table table;
if (!get_mocs_settings(i915, &table))
return 0;
return intel_gt_live_subtests(tests, to_gt(i915));
}