[igt-dev] [PATCH i-g-t] i915/gem_ctx_isolation: Sanitycheck nonpriv access
Chris Wilson
chris at chris-wilson.co.uk
Fri Mar 1 08:19:19 UTC 2019
Verify that our list of nonpriv registers exist and are writable.
v2: TD_CTL has a write_mask of 0xffff instead of being a masked
register.
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Dale B Stimson <dale.b.stimson at intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
---
tests/i915/gem_ctx_isolation.c | 167 +++++++++++++++++++++++++++------
1 file changed, 138 insertions(+), 29 deletions(-)
diff --git a/tests/i915/gem_ctx_isolation.c b/tests/i915/gem_ctx_isolation.c
index 839d49ade..e50cc9a72 100644
--- a/tests/i915/gem_ctx_isolation.c
+++ b/tests/i915/gem_ctx_isolation.c
@@ -59,16 +59,23 @@ enum {
static const struct named_register {
const char *name;
- unsigned int gen_mask;
- unsigned int engine_mask;
- uint32_t offset;
+ unsigned int gen_mask; /* on which gen the register exists */
+ unsigned int engine_mask; /* preferred engine / powerwell */
+ uint32_t offset; /* address of register, from bottom of mmio bar */
uint32_t count;
uint32_t ignore_bits;
+ uint32_t write_mask; /* some registers bits do not exist */
bool masked;
} nonpriv_registers[] = {
{ "NOPID", NOCTX, RCS0, 0x2094 },
{ "MI_PREDICATE_RESULT_2", NOCTX, RCS0, 0x23bc },
- { "INSTPM", GEN6, RCS0, 0x20c0, 1, BIT(8) /* ro counter */, true },
+ {
+ "INSTPM",
+ GEN6, RCS0, 0x20c0,
+ .ignore_bits = BIT(8) /* ro counter */,
+ .write_mask = BIT(8) /* rsvd varies between gen */,
+ .masked = true,
+ },
{ "IA_VERTICES_COUNT", GEN4, RCS0, 0x2310, 2 },
{ "IA_PRIMITIVES_COUNT", GEN4, RCS0, 0x2318, 2 },
{ "VS_INVOCATION_COUNT", GEN4, RCS0, 0x2320, 2 },
@@ -78,7 +85,7 @@ static const struct named_register {
{ "GS_PRIMITIVES_COUNT", GEN4, RCS0, 0x2330, 2 },
{ "CL_INVOCATION_COUNT", GEN4, RCS0, 0x2338, 2 },
{ "CL_PRIMITIVES_COUNT", GEN4, RCS0, 0x2340, 2 },
- { "PS_INVOCATION_COUNT_0", GEN4, RCS0, 0x22c8, 2 },
+ { "PS_INVOCATION_COUNT_0", GEN4, RCS0, 0x22c8, 2, .write_mask = ~0x3 },
{ "PS_DEPTH_COUNT_0", GEN4, RCS0, 0x22d8, 2 },
{ "GPUGPU_DISPATCHDIMX", GEN8, RCS0, 0x2500 },
{ "GPUGPU_DISPATCHDIMY", GEN8, RCS0, 0x2504 },
@@ -86,7 +93,7 @@ static const struct named_register {
{ "MI_PREDICATE_SRC0", GEN8, RCS0, 0x2400, 2 },
{ "MI_PREDICATE_SRC1", GEN8, RCS0, 0x2408, 2 },
{ "MI_PREDICATE_DATA", GEN8, RCS0, 0x2410, 2 },
- { "MI_PRED_RESULT", GEN8, RCS0, 0x2418 },
+ { "MI_PRED_RESULT", GEN8, RCS0, 0x2418, .write_mask = 0x1 },
{ "3DPRIM_END_OFFSET", GEN6, RCS0, 0x2420 },
{ "3DPRIM_START_VERTEX", GEN6, RCS0, 0x2430 },
{ "3DPRIM_VERTEX_COUNT", GEN6, RCS0, 0x2434 },
@@ -94,45 +101,45 @@ static const struct named_register {
{ "3DPRIM_START_INSTANCE", GEN6, RCS0, 0x243c },
{ "3DPRIM_BASE_VERTEX", GEN6, RCS0, 0x2440 },
{ "GPGPU_THREADS_DISPATCHED", GEN8, RCS0, 0x2290, 2 },
- { "PS_INVOCATION_COUNT_1", GEN8, RCS0, 0x22f0, 2 },
+ { "PS_INVOCATION_COUNT_1", GEN8, RCS0, 0x22f0, 2, .write_mask = ~0x3 },
{ "PS_DEPTH_COUNT_1", GEN8, RCS0, 0x22f8, 2 },
{ "BB_OFFSET", GEN8, RCS0, 0x2158, .ignore_bits = 0x4 },
{ "MI_PREDICATE_RESULT_1", GEN8, RCS0, 0x241c },
{ "CS_GPR", GEN8, RCS0, 0x2600, 32 },
{ "OA_CTX_CONTROL", GEN8, RCS0, 0x2360 },
{ "OACTXID", GEN8, RCS0, 0x2364 },
- { "PS_INVOCATION_COUNT_2", GEN8, RCS0, 0x2448, 2 },
+ { "PS_INVOCATION_COUNT_2", GEN8, RCS0, 0x2448, 2, .write_mask = ~0x3 },
{ "PS_DEPTH_COUNT_2", GEN8, RCS0, 0x2450, 2 },
- { "Cache_Mode_0", GEN7, RCS0, 0x7000 },
- { "Cache_Mode_1", GEN7, RCS0, 0x7004 },
- { "GT_MODE", GEN8, RCS0, 0x7008 },
- { "L3_Config", GEN7, RCS0, 0x7034 },
- { "TD_CTL", GEN8, RCS0, 0xe400 },
+ { "Cache_Mode_0", GEN7, RCS0, 0x7000, .masked = true },
+ { "Cache_Mode_1", GEN7, RCS0, 0x7004, .masked = true },
+ { "GT_MODE", GEN8, RCS0, 0x7008, .masked = true },
+ { "L3_Config", GEN8, RCS0, 0x7034 },
+ { "TD_CTL", GEN8, RCS0, 0xe400, .write_mask = 0xffff },
{ "TD_CTL2", GEN8, RCS0, 0xe404 },
- { "SO_NUM_PRIMS_WRITEN0", GEN6, RCS0, 0x5200, 2 },
- { "SO_NUM_PRIMS_WRITEN1", GEN6, RCS0, 0x5208, 2 },
- { "SO_NUM_PRIMS_WRITEN2", GEN6, RCS0, 0x5210, 2 },
- { "SO_NUM_PRIMS_WRITEN3", GEN6, RCS0, 0x5218, 2 },
+ { "SO_NUM_PRIMS_WRITTEN0", GEN6, RCS0, 0x5200, 2 },
+ { "SO_NUM_PRIMS_WRITTEN1", GEN6, RCS0, 0x5208, 2 },
+ { "SO_NUM_PRIMS_WRITTEN2", GEN6, RCS0, 0x5210, 2 },
+ { "SO_NUM_PRIMS_WRITTEN3", GEN6, RCS0, 0x5218, 2 },
{ "SO_PRIM_STORAGE_NEEDED0", GEN6, RCS0, 0x5240, 2 },
{ "SO_PRIM_STORAGE_NEEDED1", GEN6, RCS0, 0x5248, 2 },
{ "SO_PRIM_STORAGE_NEEDED2", GEN6, RCS0, 0x5250, 2 },
{ "SO_PRIM_STORAGE_NEEDED3", GEN6, RCS0, 0x5258, 2 },
- { "SO_WRITE_OFFSET0", GEN7, RCS0, 0x5280 },
- { "SO_WRITE_OFFSET1", GEN7, RCS0, 0x5284 },
- { "SO_WRITE_OFFSET2", GEN7, RCS0, 0x5288 },
- { "SO_WRITE_OFFSET3", GEN7, RCS0, 0x528c },
+ { "SO_WRITE_OFFSET0", GEN7, RCS0, 0x5280, .write_mask = ~0x3 },
+ { "SO_WRITE_OFFSET1", GEN7, RCS0, 0x5284, .write_mask = ~0x3 },
+ { "SO_WRITE_OFFSET2", GEN7, RCS0, 0x5288, .write_mask = ~0x3 },
+ { "SO_WRITE_OFFSET3", GEN7, RCS0, 0x528c, .write_mask = ~0x3 },
{ "OA_CONTROL", NOCTX, RCS0, 0x2b00 },
{ "PERF_CNT_1", NOCTX, RCS0, 0x91b8, 2 },
{ "PERF_CNT_2", NOCTX, RCS0, 0x91c0, 2 },
/* Privileged (enabled by w/a + FORCE_TO_NONPRIV) */
{ "CTX_PREEMPT", NOCTX /* GEN_RANGE(9, 10) */, RCS0, 0x2248 },
- { "CS_CHICKEN1", GEN_RANGE(9, 10), RCS0, 0x2580 },
- { "HDC_CHICKEN1", GEN_RANGE(9, 10), RCS0, 0x7304 },
- { "L3SQREG1", GEN8, RCS0, 0xb010 },
+ { "CS_CHICKEN1", GEN_RANGE(9, 10), RCS0, 0x2580, .masked = true },
+ { "HDC_CHICKEN1", GEN_RANGE(9, 10), RCS0, 0x7304, .masked = true },
+ { "L3SQREG4", NOCTX /* GEN9:skl,kbl */, RCS0, 0xb118, .write_mask = ~0x1ffff0 },
{ "BCS_GPR", GEN9, BCS0, 0x22600, 32 },
- { "BCS_SWCTRL", GEN8, BCS0, 0x22200 },
+ { "BCS_SWCTRL", GEN8, BCS0, 0x22200, .write_mask = 0x3, .masked = true },
{ "VCS0_GPR", GEN9, VCS0, 0x12600, 32 },
{ "MFC_VDBOX1", NOCTX, VCS0, 0x12800, 64 },
@@ -191,6 +198,42 @@ static bool ignore_register(uint32_t offset)
return false;
}
+static void tmpl_regs(int fd,
+ uint32_t ctx,
+ const struct intel_execution_engine2 *e,
+ uint32_t handle,
+ uint32_t value)
+{
+ const unsigned int gen_bit = 1 << intel_gen(intel_get_drm_devid(fd));
+ const unsigned int engine_bit = ENGINE(e->class, e->instance);
+ unsigned int regs_size;
+ uint32_t *regs;
+
+ regs_size = NUM_REGS * sizeof(uint32_t);
+ regs_size = PAGE_ALIGN(regs_size);
+
+ regs = gem_mmap__cpu(fd, handle, 0, regs_size, PROT_WRITE);
+ gem_set_domain(fd, handle,
+ I915_GEM_DOMAIN_CPU, I915_GEM_DOMAIN_CPU);
+
+ for (const struct named_register *r = nonpriv_registers; r->name; r++) {
+ if (!(r->engine_mask & engine_bit))
+ continue;
+ if (!(r->gen_mask & gen_bit))
+ continue;
+ for (unsigned count = r->count ?: 1, offset = r->offset;
+ count--; offset += 4) {
+ uint32_t x = value;
+ if (r->write_mask)
+ x &= r->write_mask;
+ if (r->masked)
+ x &= 0xffff;
+ regs[offset/sizeof(*regs)] = x;
+ }
+ }
+ munmap(regs, regs_size);
+}
+
static uint32_t read_regs(int fd,
uint32_t ctx,
const struct intel_execution_engine2 *e,
@@ -294,12 +337,15 @@ static void write_regs(int fd,
continue;
for (unsigned count = r->count ?: 1, offset = r->offset;
count--; offset += 4) {
+ uint32_t x = value;
+ if (r->write_mask)
+ x &= r->write_mask;
+ if (r->masked)
+ x |= 0xffffu << 16;
+
*b++ = 0x22 << 23 | 1; /* LRI */
*b++ = offset;
- if (r->masked)
- *b++ = value | 0xffffu << 16;
- else
- *b++ = value;
+ *b++ = x;
}
}
*b++ = MI_BATCH_BUFFER_END;
@@ -474,6 +520,66 @@ static void compare_regs(int fd, uint32_t A, uint32_t B, const char *who)
num_errors, who);
}
+static void nonpriv(int fd,
+ const struct intel_execution_engine2 *e,
+ unsigned int flags)
+{
+ static const uint32_t values[] = {
+ 0x0,
+ 0xffffffff,
+ 0xcccccccc,
+ 0x33333333,
+ 0x55555555,
+ 0xaaaaaaaa,
+ 0xf0f00f0f,
+ 0xa0a00303,
+ 0x0505c0c0,
+ 0xdeadbeef
+ };
+ unsigned int engine =
+ gem_class_instance_to_eb_flags(fd, e->class, e->instance);
+ unsigned int num_values = ARRAY_SIZE(values);
+
+ /* Sigh -- hsw: we need cmdparser access to our own registers! */
+ igt_skip_on(intel_gen(intel_get_drm_devid(fd)) < 8);
+
+ gem_quiescent_gpu(fd);
+
+ for (int v = 0; v < num_values; v++) {
+ igt_spin_t *spin = NULL;
+ uint32_t ctx, regs[2], tmpl;
+
+ ctx = gem_context_create(fd);
+ tmpl = read_regs(fd, ctx, e, flags);
+ regs[0] = read_regs(fd, ctx, e, flags);
+
+ tmpl_regs(fd, ctx, e, tmpl, values[v]);
+
+ spin = igt_spin_batch_new(fd, .ctx = ctx, .engine = engine);
+
+ igt_debug("%s[%d]: Setting all registers to 0x%08x\n",
+ __func__, v, values[v]);
+ write_regs(fd, ctx, e, flags, values[v]);
+
+ regs[1] = read_regs(fd, ctx, e, flags);
+
+ /*
+ * Restore the original register values before the HW idles.
+ * Or else it may never restart!
+ */
+ restore_regs(fd, ctx, e, flags, regs[0]);
+
+ igt_spin_batch_free(fd, spin);
+
+ compare_regs(fd, tmpl, regs[1], "nonpriv read/writes");
+
+ for (int n = 0; n < ARRAY_SIZE(regs); n++)
+ gem_close(fd, regs[n]);
+ gem_context_destroy(fd, ctx);
+ gem_close(fd, tmpl);
+ }
+}
+
static void isolation(int fd,
const struct intel_execution_engine2 *e,
unsigned int flags)
@@ -715,6 +821,9 @@ igt_main
igt_fork_hang_detector(fd);
}
+ igt_subtest_f("%s-nonpriv", e->name)
+ nonpriv(fd, e, 0);
+
igt_subtest_f("%s-clean", e->name)
isolation(fd, e, 0);
igt_subtest_f("%s-dirty-create", e->name)
--
2.20.1
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