[igt-dev] [PATCH i-g-t v3] tests/i915/gem_close_race: Adopt to use softpin

[Kamil Konieczny]

For newer gens there will be no relocations, so adopt test to
run using soft-pinned addresses. Refactor code to run on
discrete DG2. Use calculated offsets for older gens so it
will avoid applying relocations by i915 kernel driver.

v2: refactor to run on DG2 and older gens (Zbigniew review)
v3: use calculated offsets for older gens (Chris comments)

Signed-off-by: Kamil Konieczny <kamil.konieczny at linux.intel.com>
Cc: "Zbigniew Kempczyński" <zbigniew.kempczynski at intel.com>
Cc: Chris Wilson <chris at chris-wilson.co.uk>
---
 tests/i915/gem_close_race.c | 56 +++++++++++++++++++++++++++----------
 1 file changed, 42 insertions(+), 14 deletions(-)

diff --git a/tests/i915/gem_close_race.c b/tests/i915/gem_close_race.c
index ab444945..75297cb2 100644
--- a/tests/i915/gem_close_race.c
+++ b/tests/i915/gem_close_race.c
@@ -28,6 +28,7 @@
 #include <pthread.h>
 #include <unistd.h>
 #include <signal.h>
+#include <stdbool.h>
 #include <stdlib.h>
 #include <stdint.h>
 #include <stdio.h>
@@ -43,6 +44,7 @@
 #include "drm.h"
 #include "i915/gem.h"
 #include "i915/gem_create.h"
+#include "i915/gem_mman.h"
 #include "igt.h"
 
 #define OBJECT_SIZE (256 * 1024)
@@ -53,6 +55,9 @@
 
 static uint32_t devid;
 static bool has_64bit_relocations;
+static bool has_softpin;
+static uint64_t exec_addr;
+static uint64_t data_addr;
 
 #define sigev_notify_thread_id _sigev_un._tid
 
@@ -61,9 +66,9 @@ static void selfcopy(int fd, uint32_t ctx, uint32_t handle, int loops)
 	struct drm_i915_gem_relocation_entry reloc[2];
 	struct drm_i915_gem_exec_object2 gem_exec[2];
 	struct drm_i915_gem_execbuffer2 execbuf;
-	struct drm_i915_gem_pwrite gem_pwrite;
 	struct drm_i915_gem_create create;
 	uint32_t buf[16], *b = buf;
+	int err;
 
 	memset(reloc, 0, sizeof(reloc));
 
@@ -79,9 +84,10 @@ static void selfcopy(int fd, uint32_t ctx, uint32_t handle, int loops)
 	reloc[0].target_handle = handle;
 	reloc[0].read_domains = I915_GEM_DOMAIN_RENDER;
 	reloc[0].write_domain = I915_GEM_DOMAIN_RENDER;
-	*b++ = 0;
+	reloc[0].presumed_offset = data_addr;
+	*b++ = data_addr;
 	if (has_64bit_relocations)
-		*b++ = 0;
+		*b++ = CANONICAL(data_addr) >> 32;
 
 	*b++ = 512 << 16;
 	*b++ = 4*1024;
@@ -90,9 +96,10 @@ static void selfcopy(int fd, uint32_t ctx, uint32_t handle, int loops)
 	reloc[1].target_handle = handle;
 	reloc[1].read_domains = I915_GEM_DOMAIN_RENDER;
 	reloc[1].write_domain = 0;
-	*b++ = 0;
+	reloc[1].presumed_offset = data_addr;
+	*b++ = data_addr;
 	if (has_64bit_relocations)
-		*b++ = 0;
+		*b++ = CANONICAL(data_addr) >> 32;
 
 	*b++ = MI_BATCH_BUFFER_END;
 	*b++ = 0;
@@ -105,8 +112,17 @@ static void selfcopy(int fd, uint32_t ctx, uint32_t handle, int loops)
 	create.size = 4096;
 	drmIoctl(fd, DRM_IOCTL_I915_GEM_CREATE, &create);
 	gem_exec[1].handle = create.handle;
-	gem_exec[1].relocation_count = 2;
-	gem_exec[1].relocs_ptr = to_user_pointer(reloc);
+	gem_exec[1].offset = CANONICAL(exec_addr);
+	gem_exec[0].offset = CANONICAL(data_addr);
+	if (has_softpin) {
+		gem_exec[1].flags |= EXEC_OBJECT_PINNED | EXEC_OBJECT_SUPPORTS_48B_ADDRESS;
+		execbuf.flags |= I915_EXEC_NO_RELOC;
+		gem_exec[0].flags |= EXEC_OBJECT_PINNED | EXEC_OBJECT_WRITE |
+				     EXEC_OBJECT_SUPPORTS_48B_ADDRESS;
+	} else {
+		gem_exec[1].relocation_count = 2;
+		gem_exec[1].relocs_ptr = to_user_pointer(reloc);
+	}
 
 	memset(&execbuf, 0, sizeof(execbuf));
 	execbuf.buffers_ptr = to_user_pointer(gem_exec);
@@ -116,15 +132,22 @@ static void selfcopy(int fd, uint32_t ctx, uint32_t handle, int loops)
 		execbuf.flags |= I915_EXEC_BLT;
 	execbuf.rsvd1 = ctx;
 
-	memset(&gem_pwrite, 0, sizeof(gem_pwrite));
-	gem_pwrite.handle = create.handle;
-	gem_pwrite.offset = 0;
-	gem_pwrite.size = sizeof(buf);
-	gem_pwrite.data_ptr = to_user_pointer(buf);
-	if (drmIoctl(fd, DRM_IOCTL_I915_GEM_PWRITE, &gem_pwrite) == 0) {
+	err = __gem_write(fd, create.handle, 0, buf, sizeof(buf));
+	if (err == -EOPNOTSUPP) {
+		void *ptr;
+
+		ptr = __gem_mmap__device_coherent(fd, create.handle, 0, sizeof(buf), PROT_WRITE);
+		if (!ptr) {
+			err = errno;
+		} else {
+			memcpy(ptr, buf, sizeof(buf));
+			gem_munmap(ptr, sizeof(buf));
+		}
+	}
+
+	if (!err)
 		while (loops-- && __gem_execbuf(fd, &execbuf) == 0)
 			;
-	}
 
 	drmIoctl(fd, DRM_IOCTL_GEM_CLOSE, &create.handle);
 }
@@ -256,6 +279,11 @@ igt_main
 
 		devid = intel_get_drm_devid(fd);
 		has_64bit_relocations = intel_gen(devid) >= 8;
+		has_softpin = !gem_has_relocations(fd);
+		exec_addr = gem_detect_safe_start_offset(fd);
+		data_addr = gem_detect_safe_alignment(fd);
+		exec_addr = max_t(exec_addr, exec_addr, data_addr);
+		data_addr += exec_addr;
 
 		igt_fork_hang_detector(fd);
 		close(fd);
-- 
2.34.1