[PATCH 1/2] drm/i915/selftests: Exercise relative mmio paths to non-privileged registers
Chris Wilson
chris at chris-wilson.co.uk
Thu Jan 14 08:31:22 UTC 2021
Verify that context isolation is also preserved when accessing
context-local registers with relative-mmio commands.
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
drivers/gpu/drm/i915/gt/selftest_lrc.c | 88 ++++++++++++++++++++------
1 file changed, 67 insertions(+), 21 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/selftest_lrc.c b/drivers/gpu/drm/i915/gt/selftest_lrc.c
index 920979a89413..a55cbf524692 100644
--- a/drivers/gpu/drm/i915/gt/selftest_lrc.c
+++ b/drivers/gpu/drm/i915/gt/selftest_lrc.c
@@ -911,7 +911,9 @@ create_user_vma(struct i915_address_space *vm, unsigned long size)
}
static struct i915_vma *
-store_context(struct intel_context *ce, struct i915_vma *scratch)
+store_context(struct intel_context *ce,
+ struct i915_vma *scratch,
+ bool relative)
{
struct i915_vma *batch;
u32 dw, x, *cs, *hw;
@@ -940,6 +942,9 @@ store_context(struct intel_context *ce, struct i915_vma *scratch)
hw += LRC_STATE_OFFSET / sizeof(*hw);
do {
u32 len = hw[dw] & 0x7f;
+ u32 cmd = MI_STORE_REGISTER_MEM_GEN8;
+ u32 offset = 0;
+ u32 mask = ~0;
if (hw[dw] == 0) {
dw++;
@@ -951,11 +956,19 @@ store_context(struct intel_context *ce, struct i915_vma *scratch)
continue;
}
+ if (hw[dw] & MI_LRI_LRM_CS_MMIO) {
+ mask = 0xfff;
+ if (relative)
+ cmd |= MI_LRI_LRM_CS_MMIO;
+ else
+ offset = ce->engine->mmio_base;
+ }
+
dw++;
len = (len + 1) / 2;
while (len--) {
- *cs++ = MI_STORE_REGISTER_MEM_GEN8;
- *cs++ = hw[dw];
+ *cs++ = cmd;
+ *cs++ = (hw[dw] & mask) + offset;
*cs++ = lower_32_bits(scratch->node.start + x);
*cs++ = upper_32_bits(scratch->node.start + x);
@@ -994,6 +1007,7 @@ static struct i915_request *
record_registers(struct intel_context *ce,
struct i915_vma *before,
struct i915_vma *after,
+ bool relative,
u32 *sema)
{
struct i915_vma *b_before, *b_after;
@@ -1001,11 +1015,11 @@ record_registers(struct intel_context *ce,
u32 *cs;
int err;
- b_before = store_context(ce, before);
+ b_before = store_context(ce, before, relative);
if (IS_ERR(b_before))
return ERR_CAST(b_before);
- b_after = store_context(ce, after);
+ b_after = store_context(ce, after, relative);
if (IS_ERR(b_after)) {
rq = ERR_CAST(b_after);
goto err_before;
@@ -1075,7 +1089,8 @@ record_registers(struct intel_context *ce,
goto err_after;
}
-static struct i915_vma *load_context(struct intel_context *ce, u32 poison)
+static struct i915_vma *
+load_context(struct intel_context *ce, u32 poison, bool relative)
{
struct i915_vma *batch;
u32 dw, *cs, *hw;
@@ -1102,7 +1117,10 @@ static struct i915_vma *load_context(struct intel_context *ce, u32 poison)
hw = defaults;
hw += LRC_STATE_OFFSET / sizeof(*hw);
do {
+ u32 cmd = MI_INSTR(0x22, 0);
u32 len = hw[dw] & 0x7f;
+ u32 offset = 0;
+ u32 mask = ~0;
if (hw[dw] == 0) {
dw++;
@@ -1114,11 +1132,19 @@ static struct i915_vma *load_context(struct intel_context *ce, u32 poison)
continue;
}
+ if (hw[dw] & MI_LRI_LRM_CS_MMIO) {
+ mask = 0xfff;
+ if (relative)
+ cmd |= MI_LRI_LRM_CS_MMIO;
+ else
+ offset = ce->engine->mmio_base;
+ }
+
dw++;
+ *cs++ = cmd | len;
len = (len + 1) / 2;
- *cs++ = MI_LOAD_REGISTER_IMM(len);
while (len--) {
- *cs++ = hw[dw];
+ *cs++ = (hw[dw] & mask) + offset;
*cs++ = poison;
dw += 2;
}
@@ -1135,14 +1161,18 @@ static struct i915_vma *load_context(struct intel_context *ce, u32 poison)
return batch;
}
-static int poison_registers(struct intel_context *ce, u32 poison, u32 *sema)
+static int
+poison_registers(struct intel_context *ce,
+ u32 poison,
+ bool relative,
+ u32 *sema)
{
struct i915_request *rq;
struct i915_vma *batch;
u32 *cs;
int err;
- batch = load_context(ce, poison);
+ batch = load_context(ce, poison, relative);
if (IS_ERR(batch))
return PTR_ERR(batch);
@@ -1192,7 +1222,7 @@ static int compare_isolation(struct intel_engine_cs *engine,
struct i915_vma *ref[2],
struct i915_vma *result[2],
struct intel_context *ce,
- u32 poison)
+ u32 poison, bool relative)
{
u32 x, dw, *hw, *lrc;
u32 *A[2], *B[2];
@@ -1241,6 +1271,7 @@ static int compare_isolation(struct intel_engine_cs *engine,
hw += LRC_STATE_OFFSET / sizeof(*hw);
do {
u32 len = hw[dw] & 0x7f;
+ bool is_relative = relative;
if (hw[dw] == 0) {
dw++;
@@ -1252,6 +1283,9 @@ static int compare_isolation(struct intel_engine_cs *engine,
continue;
}
+ if (!(hw[dw] & MI_LRI_LRM_CS_MMIO))
+ is_relative = false;
+
dw++;
len = (len + 1) / 2;
while (len--) {
@@ -1263,9 +1297,10 @@ static int compare_isolation(struct intel_engine_cs *engine,
break;
default:
- pr_err("%s[%d]: Mismatch for register %4x, default %08x, reference %08x, result (%08x, %08x), poison %08x, context %08x\n",
- engine->name, dw,
- hw[dw], hw[dw + 1],
+ pr_err("%s[%d]: Mismatch for register %4x [using relative? %s], default %08x, reference %08x, result (%08x, %08x), poison %08x, context %08x\n",
+ engine->name, dw, hw[dw],
+ yesno(is_relative),
+ hw[dw + 1],
A[0][x], B[0][x], B[1][x],
poison, lrc[dw + 1]);
err = -EINVAL;
@@ -1291,7 +1326,8 @@ static int compare_isolation(struct intel_engine_cs *engine,
return err;
}
-static int __lrc_isolation(struct intel_engine_cs *engine, u32 poison)
+static int
+__lrc_isolation(struct intel_engine_cs *engine, u32 poison, bool relative)
{
u32 *sema = memset32(engine->status_page.addr + 1000, 0, 1);
struct i915_vma *ref[2], *result[2];
@@ -1321,7 +1357,7 @@ static int __lrc_isolation(struct intel_engine_cs *engine, u32 poison)
goto err_ref0;
}
- rq = record_registers(A, ref[0], ref[1], sema);
+ rq = record_registers(A, ref[0], ref[1], relative, sema);
if (IS_ERR(rq)) {
err = PTR_ERR(rq);
goto err_ref1;
@@ -1349,13 +1385,13 @@ static int __lrc_isolation(struct intel_engine_cs *engine, u32 poison)
goto err_result0;
}
- rq = record_registers(A, result[0], result[1], sema);
+ rq = record_registers(A, result[0], result[1], relative, sema);
if (IS_ERR(rq)) {
err = PTR_ERR(rq);
goto err_result1;
}
- err = poison_registers(B, poison, sema);
+ err = poison_registers(B, poison, relative, sema);
if (err) {
WRITE_ONCE(*sema, -1);
i915_request_put(rq);
@@ -1369,7 +1405,7 @@ static int __lrc_isolation(struct intel_engine_cs *engine, u32 poison)
}
i915_request_put(rq);
- err = compare_isolation(engine, ref, result, A, poison);
+ err = compare_isolation(engine, ref, result, A, poison, relative);
err_result1:
i915_vma_put(result[1]);
@@ -1431,13 +1467,23 @@ static int live_lrc_isolation(void *arg)
for (i = 0; i < ARRAY_SIZE(poison); i++) {
int result;
- result = __lrc_isolation(engine, poison[i]);
+ result = __lrc_isolation(engine, poison[i], false);
if (result && !err)
err = result;
- result = __lrc_isolation(engine, ~poison[i]);
+ result = __lrc_isolation(engine, ~poison[i], false);
if (result && !err)
err = result;
+
+ if (intel_engine_has_relative_mmio(engine)) {
+ result = __lrc_isolation(engine, poison[i], true);
+ if (result && !err)
+ err = result;
+
+ result = __lrc_isolation(engine, ~poison[i], true);
+ if (result && !err)
+ err = result;
+ }
}
intel_engine_pm_put(engine);
if (igt_flush_test(gt->i915)) {
--
2.20.1
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