If we caused a fault on a GEM buffer while in the middle of trying to write/read into that buffer, we could conceivably deadlock (e.g. recursing on struct_mutex if we are not careful). Exercise these cases by supplying a fresh mmap to pread/pwrite in both non-overlapping and overlapping copies.
Signed-off-by: Chris Wilson <[email protected]> --- tests/i915/gem_pread.c | 31 +++++++++++++++++++++++++++++++ tests/i915/gem_pwrite.c | 31 +++++++++++++++++++++++++++++++ 2 files changed, 62 insertions(+) diff --git a/tests/i915/gem_pread.c b/tests/i915/gem_pread.c index 00379580c..60830c5c5 100644 --- a/tests/i915/gem_pread.c +++ b/tests/i915/gem_pread.c @@ -39,6 +39,34 @@ #include <sys/time.h> #include "drm.h" +#define MiB(x) ((x) * 1024 * 1024) + +static void pread_self(int i915) +{ + uint32_t handle = gem_create(i915, MiB(4)); + void *ptr; + + ptr = gem_mmap__gtt(i915, handle, MiB(4), PROT_WRITE); + gem_read(i915, handle, 0, ptr + MiB(3), MiB(1)); + gem_read(i915, handle, MiB(3), ptr, MiB(1)); + gem_read(i915, handle, MiB(1), ptr + MiB(1), MiB(2)); + munmap(ptr, MiB(4)); + + ptr = gem_mmap__cpu(i915, handle, 0, MiB(4), PROT_WRITE); + gem_read(i915, handle, 0, ptr + MiB(3), MiB(1)); + gem_read(i915, handle, MiB(3), ptr, MiB(1)); + gem_read(i915, handle, MiB(1), ptr + MiB(1), MiB(2)); + munmap(ptr, MiB(4)); + + ptr = gem_mmap__wc(i915, handle, 0, MiB(4), PROT_WRITE); + gem_read(i915, handle, 0, ptr + MiB(3), MiB(1)); + gem_read(i915, handle, MiB(3), ptr, MiB(1)); + gem_read(i915, handle, MiB(1), ptr + MiB(1), MiB(2)); + munmap(ptr, MiB(4)); + + gem_close(i915, handle); +} + #define OBJECT_SIZE 16384 #define LARGE_OBJECT_SIZE 1024 * 1024 #define KGRN "\x1B[32m" @@ -131,6 +159,9 @@ int main(int argc, char **argv) } } + igt_subtest("self") + pread_self(fd); + for (c = cache; c->level != -1; c++) { igt_subtest(c->name) { gem_set_caching(fd, dst, c->level); diff --git a/tests/i915/gem_pwrite.c b/tests/i915/gem_pwrite.c index 696bd316a..684b4b216 100644 --- a/tests/i915/gem_pwrite.c +++ b/tests/i915/gem_pwrite.c @@ -39,6 +39,34 @@ #include <sys/time.h> #include "drm.h" +#define MiB(x) ((x) * 1024 * 1024) + +static void pwrite_self(int i915) +{ + uint32_t handle = gem_create(i915, MiB(4)); + void *ptr; + + ptr = gem_mmap__gtt(i915, handle, MiB(4), PROT_READ); + gem_write(i915, handle, 0, ptr + MiB(3), MiB(1)); + gem_write(i915, handle, MiB(3), ptr, MiB(1)); + gem_write(i915, handle, MiB(1), ptr + MiB(1), MiB(2)); + munmap(ptr, MiB(4)); + + ptr = gem_mmap__cpu(i915, handle, 0, MiB(4), PROT_READ); + gem_write(i915, handle, 0, ptr + MiB(3), MiB(1)); + gem_write(i915, handle, MiB(3), ptr, MiB(1)); + gem_write(i915, handle, MiB(1), ptr + MiB(1), MiB(2)); + munmap(ptr, MiB(4)); + + ptr = gem_mmap__wc(i915, handle, 0, MiB(4), PROT_READ); + gem_write(i915, handle, 0, ptr + MiB(3), MiB(1)); + gem_write(i915, handle, MiB(3), ptr, MiB(1)); + gem_write(i915, handle, MiB(1), ptr + MiB(1), MiB(2)); + munmap(ptr, MiB(4)); + + gem_close(i915, handle); +} + #define OBJECT_SIZE 16384 #define COPY_BLT_CMD (2<<29|0x53<<22|0x6) @@ -258,6 +286,9 @@ int main(int argc, char **argv) } } + igt_subtest("self") + pwrite_self(fd); + for (c = cache; c->level != -1; c++) { igt_subtest(c->name) { gem_set_caching(fd, dst, c->level); -- 2.20.1 _______________________________________________ Intel-gfx mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/intel-gfx
