[PATCH igt v2] igt/gem_ctx_isolation: Check isolation of registers between contexts

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



A new context assumes that all of its registers are in the default state
when it is created. What may happen is that a register written by one
context may leak into the second, causing mass confusion.

v2: extend back to Sandybridge, ignore non-priv registers that are not
context-saved (remind me what this test is all about!!!)

Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
 tests/Makefile.sources    |   1 +
 tests/gem_ctx_isolation.c | 658 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 659 insertions(+)
 create mode 100644 tests/gem_ctx_isolation.c

diff --git a/tests/Makefile.sources b/tests/Makefile.sources
index 2313c12b..9a25a8b5 100644
--- a/tests/Makefile.sources
+++ b/tests/Makefile.sources
@@ -56,6 +56,7 @@ TESTS_progs = \
 	gem_ctx_basic \
 	gem_ctx_create \
 	gem_ctx_exec \
+	gem_ctx_isolation \
 	gem_ctx_param \
 	gem_ctx_switch \
 	gem_ctx_thrash \
diff --git a/tests/gem_ctx_isolation.c b/tests/gem_ctx_isolation.c
new file mode 100644
index 00000000..9c5ec181
--- /dev/null
+++ b/tests/gem_ctx_isolation.c
@@ -0,0 +1,658 @@
+/*
+ * Copyright © 2017 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.
+ */
+
+#include "igt.h"
+#include "igt_dummyload.h"
+
+#define MAX_REG 0x40000
+#define NUM_REGS (MAX_REG / sizeof(uint32_t))
+
+#define PAGE_ALIGN(x) ALIGN(x, 4096)
+
+#define DIRTY1 0x1
+#define DIRTY2 0x2
+#define UNSAFE 0x4
+
+enum {
+	RCS_MASK = 0x1,
+	BCS_MASK = 0x2,
+	VCS_MASK = 0x4,
+	VECS_MASK = 0x8,
+};
+
+#define ALL ~0u
+#define GEN_RANGE(x, y) ((ALL >> (32 - (y - x + 1))) << x)
+#define GEN6 (ALL << 6)
+#define GEN7 (ALL << 7)
+#define GEN8 (ALL << 8)
+
+#define NOCTX 0
+
+#define LAST_KNOWN_GEN 10
+
+static const struct named_register {
+	const char *name;
+	unsigned int gen_mask;
+	unsigned int engine_mask;
+	uint32_t offset;
+	uint32_t count;
+} safe_registers[] = {
+	{ "NOPID", NOCTX, RCS_MASK, 0x2094 },
+	{ "MI_PREDICATE_RESULT_2", NOCTX, RCS_MASK, 0x23bc },
+	{ "INSTPM", GEN8, RCS_MASK, 0x20c0 },
+	{ "IA_VERTICES_COUNT", GEN6, RCS_MASK, 0x2310, 2 },
+	{ "IA_PRIMITIVES_COUNT", GEN6, RCS_MASK, 0x2318, 2 },
+	{ "VS_INVOCATION_COUNT", GEN6, RCS_MASK, 0x2320, 2 },
+	{ "HS_INVOCATION_COUNT", GEN6, RCS_MASK, 0x2300, 2 },
+	{ "DS_INVOCATION_COUNT", GEN6, RCS_MASK, 0x2308, 2 },
+	{ "GS_INVOCATION_COUNT", GEN6, RCS_MASK, 0x2328, 2 },
+	{ "GS_PRIMITIVES_COUNT", GEN6, RCS_MASK, 0x2330, 2 },
+	{ "CL_INVOCATION_COUNT", GEN6, RCS_MASK, 0x2338, 2 },
+	{ "CL_PRIMITIVES_COUNT", GEN6, RCS_MASK, 0x2340, 2 },
+	{ "PS_INVOCATION_COUNT_0", GEN6, RCS_MASK, 0x22c8, 2 },
+	{ "PS_DEPTH_COUNT_0", GEN6, RCS_MASK, 0x22d8, 2 },
+	{ "GPUGPU_DISPATCHDIMX", GEN8, RCS_MASK, 0x2500 },
+	{ "GPUGPU_DISPATCHDIMY", GEN8, RCS_MASK, 0x2504 },
+	{ "GPUGPU_DISPATCHDIMZ", GEN8, RCS_MASK, 0x2508 },
+	{ "MI_PREDICATE_SRC0", GEN8, RCS_MASK, 0x2400, 2 },
+	{ "MI_PREDICATE_SRC1", GEN8, RCS_MASK, 0x2408, 2 },
+	{ "MI_PREDICATE_DATA", GEN8, RCS_MASK, 0x2410, 2 },
+	{ "MI_PRED_RESULT", GEN8, RCS_MASK, 0x2418 },
+	{ "3DPRIM_END_OFFSET", GEN6, RCS_MASK, 0x2420 },
+	{ "3DPRIM_START_VERTEX", GEN6, RCS_MASK, 0x2430 },
+	{ "3DPRIM_VERTEX_COUNT", GEN6, RCS_MASK, 0x2434 },
+	{ "3DPRIM_INSTANCE_COUNT", GEN6, RCS_MASK, 0x2438 },
+	{ "3DPRIM_START_INSTANCE", GEN6, RCS_MASK, 0x243c },
+	{ "3DPRIM_BASE_VERTEX", GEN6, RCS_MASK, 0x2440 },
+	{ "GPGPU_THREADS_DISPATCHED", GEN8, RCS_MASK, 0x2290, 2 },
+	{ "PS_INVOCATION_COUNT_1", GEN8, RCS_MASK, 0x22f0, 2 },
+	{ "PS_DEPTH_COUNT_1", GEN8, RCS_MASK, 0x22f8, 2 },
+	{ "BB_OFFSET", GEN8, RCS_MASK, 0x2158 },
+	{ "MI_PREDICATE_RESULT_1", GEN8, RCS_MASK, 0x241c },
+	{ "CS_GPR", GEN8, RCS_MASK, 0x2600, 32 },
+	{ "OA_CTX_CONTROL", GEN8, RCS_MASK, 0x2360 },
+	{ "OACTXID", GEN8, RCS_MASK, 0x2364 },
+	{ "PS_INVOCATION_COUNT_2", GEN8, RCS_MASK, 0x2448, 2 },
+	{ "PS_DEPTH_COUNT_2", GEN8, RCS_MASK, 0x2450, 2 },
+	{ "Cache_Mode_0", GEN7, RCS_MASK, 0x7000 },
+	{ "Cache_Mode_1", GEN7, RCS_MASK, 0x7004 },
+	{ "GT_MODE", GEN8, RCS_MASK, 0x7008 },
+	{ "L3_Config", GEN7, RCS_MASK, 0x7034 },
+	{ "TD_CTL", GEN8, RCS_MASK, 0xe400 },
+	{ "TD_CTL2", GEN8, RCS_MASK, 0xe404 },
+	{ "SO_NUM_PRIMS_WRITEN0", GEN6, RCS_MASK, 0x5200, 2 },
+	{ "SO_NUM_PRIMS_WRITEN1", GEN6, RCS_MASK, 0x5208, 2 },
+	{ "SO_NUM_PRIMS_WRITEN2", GEN6, RCS_MASK, 0x5210, 2 },
+	{ "SO_NUM_PRIMS_WRITEN3", GEN6, RCS_MASK, 0x5218, 2 },
+	{ "SO_PRIM_STORAGE_NEEDED0", GEN6, RCS_MASK, 0x5240, 2 },
+	{ "SO_PRIM_STORAGE_NEEDED1", GEN6, RCS_MASK, 0x5248, 2 },
+	{ "SO_PRIM_STORAGE_NEEDED2", GEN6, RCS_MASK, 0x5250, 2 },
+	{ "SO_PRIM_STORAGE_NEEDED3", GEN6, RCS_MASK, 0x5258, 2 },
+	{ "SO_WRITE_OFFSET0", GEN7, RCS_MASK, 0x5280 },
+	{ "SO_WRITE_OFFSET1", GEN7, RCS_MASK, 0x5284 },
+	{ "SO_WRITE_OFFSET2", GEN7, RCS_MASK, 0x5288 },
+	{ "SO_WRITE_OFFSET3", GEN7, RCS_MASK, 0x528c },
+	{ "OA_CONTROL", NOCTX, RCS_MASK, 0x2b00 },
+	{ "PERF_CNT_1", NOCTX, RCS_MASK, 0x91b8, 2 },
+	{ "PERF_CNT_2", NOCTX, RCS_MASK, 0x91c0, 2 },
+
+	/* Privileged (enabled by w/a + FORCE_TO_NONPRIV) */
+	{ "CTX_PREEMPT", NOCTX /* GEN_RANGE(9, 10) */, RCS_MASK, 0x2248 },
+	{ "CS_CHICKEN1", GEN_RANGE(9, 10), RCS_MASK, 0x2580 },
+	{ "HDC_CHICKEN1", GEN_RANGE(9, 10), RCS_MASK, 0x7304 },
+	{ "L3SQREG1", GEN8, RCS_MASK, 0xb010 },
+
+	{ "BCS_GPR", GEN8, BCS_MASK, 0x22600, 32 },
+	{ "BCS_SWCTRL", GEN8, BCS_MASK, 0x22200 },
+
+	{ "VCS0_GPR", GEN8, VCS_MASK, 0x12600, 32 },
+	{ "MFC_VDBOX1", NOCTX, VCS_MASK, 0x12800, 64 },
+
+	{ "VCS1_GPR", GEN8, VCS_MASK, 0x1c600, 32 },
+	{ "MFC_VDBOX2", NOCTX, VCS_MASK, 0x1c800, 64 },
+
+	{ "VECS_GPR", GEN8, VECS_MASK, 0x1a600, 32 },
+
+	{}
+}, ignore_registers[] = {
+	{ "RCS timestamp", GEN6, RCS_MASK, 0x2358 },
+	{ "VCS0 timestamp", GEN7, VCS_MASK, 0x12358 },
+	{ "VCS1 timestamp", GEN7, VCS_MASK, 0x1c358 },
+	{ "BCS timestamp", GEN7, BCS_MASK, 0x22358 },
+	{ "VECS timestamp", GEN8, VECS_MASK, 0x1a358 },
+	{}
+};
+
+static const char *register_name(uint32_t offset, char *buf, size_t len)
+{
+	for (const struct named_register *r = safe_registers; r->name; r++) {
+		unsigned int width = r->count ? 4*r->count : 4;
+		if (offset >= r->offset && offset < r->offset + width) {
+			if (r->count <= 1)
+				return r->name;
+
+			snprintf(buf, len, "%s[%d]",
+				 r->name, (offset - r->offset)/4);
+			return buf;
+		}
+	}
+
+	return "unknown";
+}
+
+static bool ignore_register(uint32_t offset)
+{
+	for (const struct named_register *r = ignore_registers; r->name; r++) {
+		unsigned int width = r->count ? 4*r->count : 4;
+		if (offset >= r->offset && offset < r->offset + width)
+			return true;
+	}
+
+	return false;
+}
+
+static uint32_t read_regs(int fd,
+			  uint32_t ctx, unsigned int engine,
+			  unsigned int flags)
+{
+	const int gen = intel_gen(intel_get_drm_devid(fd));
+	const bool r64b = gen >= 8;
+	struct drm_i915_gem_exec_object2 obj[2];
+	struct drm_i915_gem_relocation_entry *reloc;
+	struct drm_i915_gem_execbuffer2 execbuf;
+	unsigned int regs_size, batch_size;
+	unsigned int engine_bit, gen_bit;
+	uint32_t *batch, *b;
+
+	switch (engine & 0x63) {
+	case I915_EXEC_DEFAULT:
+	case I915_EXEC_RENDER:
+		engine_bit = RCS_MASK;
+		break;
+	case I915_EXEC_BLT:
+		engine_bit = BCS_MASK;
+		break;
+	case I915_EXEC_BSD:
+		engine_bit = VCS_MASK;
+		break;
+	case I915_EXEC_VEBOX:
+		engine_bit = VECS_MASK;
+		break;
+	default:
+		igt_assert(0);
+	}
+	gen_bit = 1 << gen;
+
+	reloc = calloc(NUM_REGS, sizeof(*reloc));
+	igt_assert(reloc);
+
+	regs_size = NUM_REGS * sizeof(uint32_t);
+	regs_size = PAGE_ALIGN(regs_size);
+
+	batch_size = NUM_REGS * 4 * sizeof(uint32_t) + 4;
+	batch_size = PAGE_ALIGN(batch_size);
+
+	memset(obj, 0, sizeof(obj));
+	obj[0].handle = gem_create(fd, regs_size);
+	obj[1].handle = gem_create(fd, batch_size);
+	obj[1].relocs_ptr = to_user_pointer(reloc);
+
+	b = batch = gem_mmap__cpu(fd, obj[1].handle, 0, batch_size, PROT_WRITE);
+	gem_set_domain(fd, obj[1].handle,
+		       I915_GEM_DOMAIN_CPU, I915_GEM_DOMAIN_CPU);
+
+	if (flags & UNSAFE) {
+		for (unsigned int n = 0; n < NUM_REGS; n++) {
+			*b++ = 0x24 << 23 | (1 + r64b);
+			*b++ = n * sizeof(uint32_t);
+			reloc[n].target_handle = obj[0].handle;
+			reloc[n].presumed_offset = 0;
+			reloc[n].offset = (b - batch) * sizeof(*b);
+			reloc[n].delta = sizeof(uint32_t) * n;
+			reloc[n].read_domains = I915_GEM_DOMAIN_RENDER;
+			reloc[n].write_domain = I915_GEM_DOMAIN_RENDER;
+			*b++ = reloc[n].delta;
+			if (r64b)
+				*b++ = 0;
+		}
+		obj[1].relocation_count = NUM_REGS;
+	} else {
+		unsigned int n = 0;
+
+		for (const struct named_register *r = safe_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) {
+				*b++ = 0x24 << 23 | (1 + r64b); /* SRM */
+				*b++ = offset;
+				reloc[n].target_handle = obj[0].handle;
+				reloc[n].presumed_offset = 0;
+				reloc[n].offset = (b - batch) * sizeof(*b);
+				reloc[n].delta = offset;
+				reloc[n].read_domains = I915_GEM_DOMAIN_RENDER;
+				reloc[n].write_domain = I915_GEM_DOMAIN_RENDER;
+				*b++ = offset;
+				if (r64b)
+					*b++ = 0;
+				n++;
+			}
+		}
+
+		obj[1].relocation_count = n;
+	}
+	*b++ = MI_BATCH_BUFFER_END;
+	munmap(batch, batch_size);
+
+	memset(&execbuf, 0, sizeof(execbuf));
+	execbuf.buffers_ptr = to_user_pointer(obj);
+	execbuf.buffer_count = 2;
+	execbuf.flags = engine;
+	execbuf.rsvd1 = ctx;
+	gem_execbuf(fd, &execbuf);
+	gem_close(fd, obj[1].handle);
+	free(reloc);
+
+	return obj[0].handle;
+}
+
+static void write_regs(int fd,
+		       uint32_t ctx, unsigned int engine,
+		       unsigned int flags,
+		       uint32_t value)
+{
+	const int gen = intel_gen(intel_get_drm_devid(fd));
+	struct drm_i915_gem_exec_object2 obj;
+	struct drm_i915_gem_execbuffer2 execbuf;
+	unsigned int engine_bit, gen_bit;
+	unsigned int batch_size;
+	uint32_t *batch, *b;
+
+	switch (engine & 0x63) {
+	case I915_EXEC_DEFAULT:
+	case I915_EXEC_RENDER:
+		engine_bit = RCS_MASK;
+		break;
+	case I915_EXEC_BLT:
+		engine_bit = BCS_MASK;
+		break;
+	case I915_EXEC_BSD:
+		engine_bit = VCS_MASK;
+		break;
+	case I915_EXEC_VEBOX:
+		engine_bit = VECS_MASK;
+		break;
+	default:
+		igt_assert(0);
+	}
+	gen_bit = 1 << gen;
+
+	batch_size = NUM_REGS * 3 * sizeof(uint32_t) + 4;
+	batch_size = PAGE_ALIGN(batch_size);
+
+	memset(&obj, 0, sizeof(obj));
+	obj.handle = gem_create(fd, batch_size);
+
+	b = batch = gem_mmap__cpu(fd, obj.handle, 0, batch_size, PROT_WRITE);
+	gem_set_domain(fd, obj.handle,
+		       I915_GEM_DOMAIN_CPU, I915_GEM_DOMAIN_CPU);
+
+	if (flags & UNSAFE) {
+		for (unsigned int n = 0; n < NUM_REGS; n++) {
+			*b++ = 0x22 << 23 | 1; /* LRI */
+			*b++ = n * sizeof(uint32_t);
+			*b++ = value;
+		}
+	} else {
+		for (const struct named_register *r = safe_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) {
+				*b++ = 0x22 << 23 | 1; /* LRI */
+				*b++ = offset;
+				*b++ = value;
+			}
+		}
+	}
+	*b++ = MI_BATCH_BUFFER_END;
+	munmap(batch, batch_size);
+
+	memset(&execbuf, 0, sizeof(execbuf));
+	execbuf.buffers_ptr = to_user_pointer(&obj);
+	execbuf.buffer_count = 1;
+	execbuf.flags = engine;
+	execbuf.rsvd1 = ctx;
+	gem_execbuf(fd, &execbuf);
+	gem_close(fd, obj.handle);
+}
+
+static void restore_regs(int fd,
+			 uint32_t ctx, unsigned int engine,
+			 unsigned int flags,
+			 uint32_t regs)
+{
+	const int gen = intel_gen(intel_get_drm_devid(fd));
+	const bool r64b = gen >= 8;
+	struct drm_i915_gem_exec_object2 obj[2];
+	struct drm_i915_gem_execbuffer2 execbuf;
+	struct drm_i915_gem_relocation_entry *reloc;
+	unsigned int engine_bit, gen_bit;
+	unsigned int batch_size;
+	uint32_t *batch, *b;
+
+	if (gen < 7) /* no LRM */
+		return;
+
+	switch (engine & 0x63) {
+	case I915_EXEC_DEFAULT:
+	case I915_EXEC_RENDER:
+		engine_bit = RCS_MASK;
+		break;
+	case I915_EXEC_BLT:
+		engine_bit = BCS_MASK;
+		break;
+	case I915_EXEC_BSD:
+		engine_bit = VCS_MASK;
+		break;
+	case I915_EXEC_VEBOX:
+		engine_bit = VECS_MASK;
+		break;
+	default:
+		igt_assert(0);
+	}
+	gen_bit = 1 << gen;
+
+	reloc = calloc(NUM_REGS, sizeof(*reloc));
+	igt_assert(reloc);
+
+	batch_size = NUM_REGS * 3 * sizeof(uint32_t) + 4;
+	batch_size = PAGE_ALIGN(batch_size);
+
+	memset(obj, 0, sizeof(obj));
+	obj[0].handle = regs;
+	obj[1].handle = gem_create(fd, batch_size);
+	obj[1].relocs_ptr = to_user_pointer(reloc);
+
+	b = batch = gem_mmap__cpu(fd, obj[1].handle, 0, batch_size, PROT_WRITE);
+	gem_set_domain(fd, obj[1].handle,
+		       I915_GEM_DOMAIN_CPU, I915_GEM_DOMAIN_CPU);
+
+	if (flags & UNSAFE) {
+		for (unsigned int n = 0; n < NUM_REGS; n++) {
+			*b++ = 0x29 << 23 | (1 + r64b); /* LRM */
+			*b++ = n * sizeof(uint32_t);
+			reloc[n].target_handle = obj[0].handle;
+			reloc[n].presumed_offset = 0;
+			reloc[n].offset = (b - batch) * sizeof(*b);
+			reloc[n].delta = n * sizeof(uint32_t);
+			reloc[n].read_domains = I915_GEM_DOMAIN_RENDER;
+			reloc[n].write_domain = 0;
+			*b++ = reloc[n].delta;
+			if (r64b)
+				*b++ = 0;
+		}
+
+		obj[1].relocation_count = NUM_REGS;
+	} else {
+		unsigned int n = 0;
+
+		for (const struct named_register *r = safe_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) {
+				*b++ = 0x29 << 23 | (1 + r64b); /* LRM */
+				*b++ = offset;
+				reloc[n].target_handle = obj[0].handle;
+				reloc[n].presumed_offset = 0;
+				reloc[n].offset = (b - batch) * sizeof(*b);
+				reloc[n].delta = offset;
+				reloc[n].read_domains = I915_GEM_DOMAIN_RENDER;
+				reloc[n].write_domain = 0;
+				*b++ = offset;
+				if (gen >= 9)
+					*b++ = 0;
+				n++;
+			}
+		}
+
+		obj[1].relocation_count = n;
+	}
+	*b++ = MI_BATCH_BUFFER_END;
+	munmap(batch, batch_size);
+
+	memset(&execbuf, 0, sizeof(execbuf));
+	execbuf.buffers_ptr = to_user_pointer(obj);
+	execbuf.buffer_count = 2;
+	execbuf.flags = engine;
+	execbuf.rsvd1 = ctx;
+	gem_execbuf(fd, &execbuf);
+	gem_close(fd, obj[1].handle);
+}
+
+__attribute__((unused))
+static void dump_regs(int fd, unsigned int engine, unsigned int regs)
+{
+	const int gen = intel_gen(intel_get_drm_devid(fd));
+	unsigned int engine_bit, gen_bit;
+	unsigned int regs_size;
+	uint32_t *out;
+
+	switch (engine & 0x63) {
+	case I915_EXEC_DEFAULT:
+	case I915_EXEC_RENDER:
+		engine_bit = RCS_MASK;
+		break;
+	case I915_EXEC_BLT:
+		engine_bit = BCS_MASK;
+		break;
+	case I915_EXEC_BSD:
+		engine_bit = VCS_MASK;
+		break;
+	case I915_EXEC_VEBOX:
+		engine_bit = VECS_MASK;
+		break;
+	default:
+		igt_assert(0);
+	}
+	gen_bit = 1 << gen;
+
+	regs_size = NUM_REGS * sizeof(uint32_t);
+	regs_size = PAGE_ALIGN(regs_size);
+
+	out = gem_mmap__cpu(fd, regs, 0, regs_size, PROT_READ);
+	gem_set_domain(fd, regs, I915_GEM_DOMAIN_CPU, 0);
+
+	for (const struct named_register *r = safe_registers; r->name; r++) {
+		if (!(r->engine_mask & engine_bit))
+			continue;
+		if (!(r->gen_mask & gen_bit))
+			continue;
+
+		if (r->count <= 1) {
+			igt_debug("0x%04x (%s): 0x%08x\n",
+				  r->offset, r->name, out[r->offset/4]);
+		} else {
+			for (unsigned x = 0; x < r->count; x++)
+				igt_debug("0x%04x (%s[%d]): 0x%08x\n",
+					  r->offset+4*x, r->name, x,
+					  out[r->offset/4 + x]);
+		}
+	}
+	munmap(out, regs_size);
+}
+
+static void compare_regs(int fd, uint32_t A, uint32_t B, const char *who)
+{
+	unsigned int num_errors;
+	unsigned int regs_size;
+	uint32_t *a, *b;
+	char buf[80];
+
+	regs_size = NUM_REGS * sizeof(uint32_t);
+	regs_size = PAGE_ALIGN(regs_size);
+
+	a = gem_mmap__cpu(fd, A, 0, regs_size, PROT_READ);
+	gem_set_domain(fd, A, I915_GEM_DOMAIN_CPU, 0);
+
+	b = gem_mmap__cpu(fd, B, 0, regs_size, PROT_READ);
+	gem_set_domain(fd, B, I915_GEM_DOMAIN_CPU, 0);
+
+	num_errors = 0;
+	for (unsigned int n = 0; n < NUM_REGS; n++) {
+		uint32_t offset = n * sizeof(uint32_t);
+		if (a[n] != b[n] && !ignore_register(offset)) {
+			igt_warn("Register 0x%04x (%s): A=%08x B=%08x\n",
+				 offset,
+				 register_name(offset, buf, sizeof(buf)),
+				 a[n], b[n]);
+			num_errors++;
+		}
+	}
+	munmap(b, regs_size);
+	munmap(a, regs_size);
+
+	igt_assert_f(num_errors == 0,
+		     "%d registers mistached between %s.\n",
+		     num_errors, who);
+}
+
+static void isolation(int fd, unsigned int engine, unsigned int flags)
+{
+	static const uint32_t values[] = {
+		0x0,
+		0xffffffff,
+		0xcccccccc,
+		0x33333333,
+		0x55555555,
+		0xaaaaaaaa,
+		0xdeadbeef
+	};
+	unsigned int num_values =
+		flags & (DIRTY1 | DIRTY2) ? ARRAY_SIZE(values) : 1;
+
+	for (int v = 0; v < num_values; v++) {
+		igt_spin_t *spin = NULL;
+		uint32_t ctx[2], regs[2], tmp;
+
+		ctx[0] = gem_context_create(fd);
+		regs[0] = read_regs(fd, ctx[0], engine, flags);
+
+		spin = igt_spin_batch_new(fd, ctx[0], engine, 0);
+
+		if (flags & DIRTY1) {
+			igt_debug("%s[%d]: Setting all registers of ctx 0 to 0x%08x\n",
+				  __func__, v, values[v]);
+			write_regs(fd, ctx[0], engine, flags, values[v]);
+		}
+
+		/*
+		 * We create and execute a new context, whilst the HW is
+		 * occupied with the previous context (we should switch from
+		 * the old to the new proto-context without idling, which could
+		 * then load the powercontext). If all goes well, we only see
+		 * the default values from this context, but if goes badly we
+		 * see the corruption from the previous context instead!
+		 */
+		ctx[1] = gem_context_create(fd);
+		regs[1] = read_regs(fd, ctx[1], engine, flags);
+
+		if (flags & DIRTY2) {
+			igt_debug("%s[%d]: Setting all registers of ctx 1 to 0x%08x\n",
+				  __func__, v, ~values[v]);
+			write_regs(fd, ctx[1], engine, flags, ~values[v]);
+		}
+
+		/*
+		 * Restore the original register values before the HW idles.
+		 * Or else it may never restart!
+		 */
+		tmp = read_regs(fd, ctx[0], engine, flags);
+		restore_regs(fd, ctx[0], engine, flags, regs[0]);
+
+		igt_spin_batch_free(fd, spin);
+
+		if (!(flags & DIRTY1))
+			compare_regs(fd, regs[0], tmp, "two reads of the same ctx");
+		compare_regs(fd, regs[0], regs[1], "two virgin contexts");
+
+		for (int n = 0; n < ARRAY_SIZE(ctx); n++) {
+			gem_close(fd, regs[n]);
+			gem_context_destroy(fd, ctx[n]);
+		}
+		gem_close(fd, tmp);
+	}
+}
+
+igt_main
+{
+	const unsigned int platform_validation = 0;
+	int fd = -1;
+
+	igt_fixture {
+		int gen;
+
+		fd = drm_open_driver(DRIVER_INTEL);
+		igt_require_gem(fd);
+
+		gem_context_destroy(fd, gem_context_create(fd));
+
+		gen = intel_gen(intel_get_drm_devid(fd));
+		//igt_ci_fail_on(gen > LAST_KNOWN_GEN);
+		igt_skip_on(gen > LAST_KNOWN_GEN);
+	}
+
+	for (const struct intel_execution_engine *e =
+	     intel_execution_engines; e->name; e++) {
+		igt_subtest_group {
+			unsigned int engine = e->exec_id | e->flags;
+			igt_fixture {
+				gem_require_ring(fd, engine);
+			}
+
+			igt_subtest_f("%s-clean", e->name)
+				isolation(fd, engine, 0);
+			igt_subtest_f("%s-dirty-create", e->name)
+				isolation(fd, engine, DIRTY1);
+			igt_subtest_f("%s-dirty-switch", e->name)
+				isolation(fd, engine, DIRTY2);
+
+			igt_subtest_f("%s-unsafe", e->name) {
+				igt_require(platform_validation);
+				isolation(fd, engine, DIRTY2 | DIRTY1 | UNSAFE);
+			}
+		}
+	}
+}
-- 
2.15.0.rc2

_______________________________________________
Intel-gfx mailing list
Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
https://lists.freedesktop.org/mailman/listinfo/intel-gfx




[Index of Archives]     [Linux USB Devel]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]
  Powered by Linux