[Intel-gfx] [PATCH i-g-t] i915/gem_ctx_isolation: Sanitycheck nonpriv access
Dale B Stimson
dale.b.stimson at intel.com
Fri Mar 1 00:36:10 UTC 2019
On Sat, Feb 23, 2019 at 09:45:10AM +0000, Chris Wilson wrote:
> Verify that our list of nonpriv registers exist and are writable.
>
> 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 | 164 +++++++++++++++++++++++++++------
> 1 file changed, 135 insertions(+), 29 deletions(-)
>
> diff --git a/tests/i915/gem_ctx_isolation.c b/tests/i915/gem_ctx_isolation.c
> index 839d49ad..991a997f 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 },
I can't find a reason for adding ".write_mask = ~0x3".
Among other places, I've looked in:
https://01.org/sites/default/files/documentation/intel-gfx-prm-osrc-kbl-vol02c-commandreference-registers-part2_0.pdf
> { "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 },
Same comment as for "PS_INVOCATION_COUNT_0" above.
> { "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 },
Same comment as for "PS_INVOCATION_COUNT_0" above.
> { "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, .masked = true },
It looks to me like TD_CTL should not be ".masked = true", as docs state
"reserved" and "31:16 MBZ".
> { "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 +520,63 @@ 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,
> + 0xdeadbeef
> + };
> + unsigned int engine =
> + gem_class_instance_to_eb_flags(fd, e->class, e->instance);
> + unsigned int num_values = ARRAY_SIZE(values);
> +
> + /* Sigh -- 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 +818,9 @@ 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)
> --
> 2.21.0
>
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