From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga06.intel.com (mga06.intel.com [134.134.136.31]) by gabe.freedesktop.org (Postfix) with ESMTPS id 349626ECF2 for ; Fri, 4 Sep 2020 23:25:56 +0000 (UTC) From: Ashutosh Dixit Date: Fri, 4 Sep 2020 16:25:34 -0400 Message-Id: <20200904202534.15151-1-ashutosh.dixit@intel.com> MIME-Version: 1.0 Subject: [igt-dev] [PATCH i-g-t] lib/ioctl_wrappers: Keep IGT working without pread/pwrite ioctls List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: igt-dev-bounces@lists.freedesktop.org Sender: "igt-dev" To: igt-dev@lists.freedesktop.org List-ID: The general direction at this time is to phase out pread/write ioctls and not support them in future products. This means IGT must handle the absence of these ioctls. This patch does this by modifying gem_read() and gem_write() to do the read/write using the pread/pwrite ioctls first but when these ioctls are unavailable fall back to doing the read/write using a combination of mmap and memcpy. Callers who must absolutely use the pread/pwrite ioctls (such as tests which test these ioctls or must otherwise only use the pread/pwrite ioctls) must use gem_require_pread_pwrite() to skip when these ioctls are not available. v2: Removed __gem_pread, gem_pread, __gem_pwrite and gem_pwrite introduced in v1 since they don't appear necessary Signed-off-by: Ashutosh Dixit --- lib/ioctl_wrappers.c | 133 +++++++++++++++++++- lib/ioctl_wrappers.h | 3 + tests/i915/gem_madvise.c | 1 + tests/i915/gem_partial_pwrite_pread.c | 1 + tests/i915/gem_pread.c | 1 + tests/i915/gem_pread_after_blit.c | 1 + tests/i915/gem_pwrite.c | 1 + tests/i915/gem_pwrite_snooped.c | 1 + tests/i915/gem_readwrite.c | 1 + tests/i915/gem_set_tiling_vs_pwrite.c | 1 + tests/i915/gem_tiled_partial_pwrite_pread.c | 1 + tests/i915/gem_tiled_pread_basic.c | 1 + tests/i915/gem_tiled_pread_pwrite.c | 1 + tests/i915/gem_userptr_blits.c | 2 + tests/i915/gen9_exec_parse.c | 4 +- 15 files changed, 146 insertions(+), 7 deletions(-) diff --git a/lib/ioctl_wrappers.c b/lib/ioctl_wrappers.c index 3781286d8..ff483fbbc 100644 --- a/lib/ioctl_wrappers.c +++ b/lib/ioctl_wrappers.c @@ -55,6 +55,7 @@ #include "igt_debugfs.h" #include "igt_sysfs.h" #include "config.h" +#include "i915/gem_mman.h" #ifdef HAVE_VALGRIND #include @@ -323,6 +324,68 @@ void gem_close(int fd, uint32_t handle) do_ioctl(fd, DRM_IOCTL_GEM_CLOSE, &close_bo); } +static bool is_cache_coherent(int fd, uint32_t handle) +{ + return gem_get_caching(fd, handle) != I915_CACHING_NONE; +} + +static void mmap_write(int fd, uint32_t handle, uint64_t offset, + const void *buf, uint64_t length) +{ + void *map = NULL; + + if (is_cache_coherent(fd, handle)) { + /* offset arg for mmap functions must be 0 */ + map = __gem_mmap__cpu_coherent(fd, handle, 0, offset + length, + PROT_READ | PROT_WRITE); + if (map) + gem_set_domain(fd, handle, + I915_GEM_DOMAIN_CPU, I915_GEM_DOMAIN_CPU); + } + + if (!map) { + map = __gem_mmap_offset__wc(fd, handle, 0, offset + length, + PROT_READ | PROT_WRITE); + if (!map) + map = gem_mmap__wc(fd, handle, 0, offset + length, + PROT_READ | PROT_WRITE); + if (map) + gem_set_domain(fd, handle, + I915_GEM_DOMAIN_WC, I915_GEM_DOMAIN_WC); + } + + igt_assert(map); + memcpy(map + offset, buf, length); + munmap(map, offset + length); +} + +static void mmap_read(int fd, uint32_t handle, uint64_t offset, void *buf, uint64_t length) +{ + void *map = NULL; + + if (gem_has_llc(fd) || is_cache_coherent(fd, handle)) { + /* offset arg for mmap functions must be 0 */ + map = __gem_mmap__cpu_coherent(fd, handle, 0, + offset + length, PROT_READ); + if (map) + gem_set_domain(fd, handle, I915_GEM_DOMAIN_CPU, 0); + } + + if (!map) { + map = __gem_mmap_offset__wc(fd, handle, 0, offset + length, + PROT_READ); + if (!map) + map = gem_mmap__wc(fd, handle, 0, offset + length, + PROT_READ); + if (map) + gem_set_domain(fd, handle, I915_GEM_DOMAIN_WC, 0); + } + + igt_assert(map); + memcpy(buf, map + offset, length); + munmap(map, offset + length); +} + int __gem_write(int fd, uint32_t handle, uint64_t offset, const void *buf, uint64_t length) { struct drm_i915_gem_pwrite gem_pwrite; @@ -348,12 +411,18 @@ int __gem_write(int fd, uint32_t handle, uint64_t offset, const void *buf, uint6 * @buf: pointer to the data to write into the buffer * @length: size of the subrange * - * This wraps the PWRITE ioctl, which is to upload a linear data to a subrange - * of a gem buffer object. + * Method to write to a gem object. Uses the PWRITE ioctl when it is + * available, else it uses mmap + memcpy to upload linear data to a + * subrange of a gem buffer object. */ void gem_write(int fd, uint32_t handle, uint64_t offset, const void *buf, uint64_t length) { - igt_assert_eq(__gem_write(fd, handle, offset, buf, length), 0); + int ret = __gem_write(fd, handle, offset, buf, length); + + igt_assert(ret == 0 || ret == EOPNOTSUPP); + + if (ret == EOPNOTSUPP) + mmap_write(fd, handle, offset, buf, length); } int __gem_read(int fd, uint32_t handle, uint64_t offset, void *buf, uint64_t length) @@ -380,12 +449,64 @@ int __gem_read(int fd, uint32_t handle, uint64_t offset, void *buf, uint64_t len * @buf: pointer to the data to read into * @length: size of the subrange * - * This wraps the PREAD ioctl, which is to download a linear data to a subrange - * of a gem buffer object. + * Method to read from a gem object. Uses the PREAD ioctl when it is + * available, else it uses mmap + memcpy to download linear data from a + * subrange of a gem buffer object. */ void gem_read(int fd, uint32_t handle, uint64_t offset, void *buf, uint64_t length) { - igt_assert_eq(__gem_read(fd, handle, offset, buf, length), 0); + int ret = __gem_read(fd, handle, offset, buf, length); + + igt_assert(ret == 0 || ret == EOPNOTSUPP); + + if (ret == EOPNOTSUPP) + mmap_read(fd, handle, offset, buf, length); +} + +/** + * gem_has_pwrite + * @fd: open i915 drm file descriptor + * + * Feature test macro to query whether pwrite ioctl is supported + */ +bool gem_has_pwrite(int fd) +{ + uint32_t handle = gem_create(fd, 4096); + int buf, ret; + + ret = __gem_write(fd, handle, 0, &buf, sizeof(buf)); + gem_close(fd, handle); + + return ret != EOPNOTSUPP; +} + +/** + * gem_has_pread + * @fd: open i915 drm file descriptor + * + * Feature test macro to query whether pread ioctl is supported + */ +bool gem_has_pread(int fd) +{ + uint32_t handle = gem_create(fd, 4096); + int buf, ret; + + ret = __gem_read(fd, handle, 0, &buf, sizeof(buf)); + gem_close(fd, handle); + + return ret != EOPNOTSUPP; +} + +/** + * gem_require_pread_pwrite + * @fd: open i915 drm file descriptor + * + * Feature test macro to query whether pread/pwrite ioctls are supported + * and skip if they are not + */ +void gem_require_pread_pwrite(int fd) +{ + igt_require(gem_has_pread(fd) && gem_has_pwrite(fd)); } int __gem_set_domain(int fd, uint32_t handle, uint32_t read, uint32_t write) diff --git a/lib/ioctl_wrappers.h b/lib/ioctl_wrappers.h index 870ac8b7b..6ba551a71 100644 --- a/lib/ioctl_wrappers.h +++ b/lib/ioctl_wrappers.h @@ -71,6 +71,9 @@ int __gem_write(int fd, uint32_t handle, uint64_t offset, const void *buf, uint6 void gem_write(int fd, uint32_t handle, uint64_t offset, const void *buf, uint64_t length); int __gem_read(int fd, uint32_t handle, uint64_t offset, void *buf, uint64_t length); void gem_read(int fd, uint32_t handle, uint64_t offset, void *buf, uint64_t length); +bool gem_has_pwrite(int fd); +bool gem_has_pread(int fd); +void gem_require_pread_pwrite(int fd); int __gem_set_domain(int fd, uint32_t handle, uint32_t read, uint32_t write); void gem_set_domain(int fd, uint32_t handle, uint32_t read, uint32_t write); int gem_wait(int fd, uint32_t handle, int64_t *timeout_ns); diff --git a/tests/i915/gem_madvise.c b/tests/i915/gem_madvise.c index 54c9befff..20c3d44ce 100644 --- a/tests/i915/gem_madvise.c +++ b/tests/i915/gem_madvise.c @@ -154,6 +154,7 @@ dontneed_before_pwrite(void) uint32_t bbe = MI_BATCH_BUFFER_END; uint32_t handle; + gem_require_pread_pwrite(fd); handle = gem_create(fd, OBJECT_SIZE); gem_madvise(fd, handle, I915_MADV_DONTNEED); diff --git a/tests/i915/gem_partial_pwrite_pread.c b/tests/i915/gem_partial_pwrite_pread.c index b4bae9b6d..136a53558 100644 --- a/tests/i915/gem_partial_pwrite_pread.c +++ b/tests/i915/gem_partial_pwrite_pread.c @@ -284,6 +284,7 @@ igt_main data.drm_fd = drm_open_driver(DRIVER_INTEL); igt_require_gem(data.drm_fd); gem_require_blitter(data.drm_fd); + gem_require_pread_pwrite(data.drm_fd); data.devid = intel_get_drm_devid(data.drm_fd); data.bops = buf_ops_create(data.drm_fd); diff --git a/tests/i915/gem_pread.c b/tests/i915/gem_pread.c index 6d12b8e9f..db1eacedc 100644 --- a/tests/i915/gem_pread.c +++ b/tests/i915/gem_pread.c @@ -149,6 +149,7 @@ igt_main_args("s:", NULL, help_str, opt_handler, NULL) igt_fixture { fd = drm_open_driver(DRIVER_INTEL); + gem_require_pread_pwrite(fd); dst = gem_create(fd, object_size); src = malloc(object_size); diff --git a/tests/i915/gem_pread_after_blit.c b/tests/i915/gem_pread_after_blit.c index 81454c930..5c99d0887 100644 --- a/tests/i915/gem_pread_after_blit.c +++ b/tests/i915/gem_pread_after_blit.c @@ -212,6 +212,7 @@ igt_main igt_fixture { fd = drm_open_driver(DRIVER_INTEL); igt_require_gem(fd); + gem_require_pread_pwrite(fd); bufmgr = drm_intel_bufmgr_gem_init(fd, 4096); drm_intel_bufmgr_gem_enable_reuse(bufmgr); diff --git a/tests/i915/gem_pwrite.c b/tests/i915/gem_pwrite.c index e491263fd..eea51f978 100644 --- a/tests/i915/gem_pwrite.c +++ b/tests/i915/gem_pwrite.c @@ -317,6 +317,7 @@ igt_main_args("s:", NULL, help_str, opt_handler, NULL) igt_fixture { fd = drm_open_driver(DRIVER_INTEL); + gem_require_pread_pwrite(fd); dst = gem_create(fd, object_size); src = malloc(object_size); diff --git a/tests/i915/gem_pwrite_snooped.c b/tests/i915/gem_pwrite_snooped.c index 4a3395241..a2eca6afc 100644 --- a/tests/i915/gem_pwrite_snooped.c +++ b/tests/i915/gem_pwrite_snooped.c @@ -132,6 +132,7 @@ igt_simple_main fd = drm_open_driver(DRIVER_INTEL); igt_require_gem(fd); gem_require_blitter(fd); + gem_require_pread_pwrite(fd); devid = intel_get_drm_devid(fd); bufmgr = drm_intel_bufmgr_gem_init(fd, 4096); diff --git a/tests/i915/gem_readwrite.c b/tests/i915/gem_readwrite.c index 6b2977c1c..ca31741c6 100644 --- a/tests/i915/gem_readwrite.c +++ b/tests/i915/gem_readwrite.c @@ -83,6 +83,7 @@ igt_main igt_fixture { fd = drm_open_driver(DRIVER_INTEL); + gem_require_pread_pwrite(fd); handle = gem_create(fd, OBJECT_SIZE); } diff --git a/tests/i915/gem_set_tiling_vs_pwrite.c b/tests/i915/gem_set_tiling_vs_pwrite.c index 302ea24b6..8f38c9b9b 100644 --- a/tests/i915/gem_set_tiling_vs_pwrite.c +++ b/tests/i915/gem_set_tiling_vs_pwrite.c @@ -55,6 +55,7 @@ igt_simple_main fd = drm_open_driver(DRIVER_INTEL); igt_require(gem_available_fences(fd) > 0); + gem_require_pread_pwrite(fd); for (int i = 0; i < OBJECT_SIZE/4; i++) data[i] = i; diff --git a/tests/i915/gem_tiled_partial_pwrite_pread.c b/tests/i915/gem_tiled_partial_pwrite_pread.c index 7de5358b2..0c4545990 100644 --- a/tests/i915/gem_tiled_partial_pwrite_pread.c +++ b/tests/i915/gem_tiled_partial_pwrite_pread.c @@ -270,6 +270,7 @@ igt_main igt_require_gem(fd); gem_require_mappable_ggtt(fd); gem_require_blitter(fd); + gem_require_pread_pwrite(fd); bufmgr = drm_intel_bufmgr_gem_init(fd, 4096); //drm_intel_bufmgr_gem_enable_reuse(bufmgr); diff --git a/tests/i915/gem_tiled_pread_basic.c b/tests/i915/gem_tiled_pread_basic.c index 7cb644104..f8f73c03a 100644 --- a/tests/i915/gem_tiled_pread_basic.c +++ b/tests/i915/gem_tiled_pread_basic.c @@ -127,6 +127,7 @@ igt_simple_main igt_require(gem_available_fences(fd) > 0); handle = create_bo(fd); igt_require(gem_get_tiling(fd, handle, &tiling, &swizzle)); + gem_require_pread_pwrite(fd); devid = intel_get_drm_devid(fd); diff --git a/tests/i915/gem_tiled_pread_pwrite.c b/tests/i915/gem_tiled_pread_pwrite.c index f58048faa..28490840f 100644 --- a/tests/i915/gem_tiled_pread_pwrite.c +++ b/tests/i915/gem_tiled_pread_pwrite.c @@ -114,6 +114,7 @@ igt_simple_main fd = drm_open_driver(DRIVER_INTEL); igt_require(gem_available_fences(fd) > 0); + gem_require_pread_pwrite(fd); count = gem_available_fences(fd) + 1; intel_require_memory(2 * count, sizeof(linear), CHECK_RAM); diff --git a/tests/i915/gem_userptr_blits.c b/tests/i915/gem_userptr_blits.c index 268423dcd..0ccfdbd9c 100644 --- a/tests/i915/gem_userptr_blits.c +++ b/tests/i915/gem_userptr_blits.c @@ -890,6 +890,7 @@ static int test_forbidden_ops(int fd) uint32_t handle; void *ptr; + gem_require_pread_pwrite(fd); igt_assert(posix_memalign(&ptr, PAGE_SIZE, PAGE_SIZE) == 0); gem_userptr(fd, ptr, PAGE_SIZE, 0, userptr_flags, &handle); @@ -1416,6 +1417,7 @@ static void test_readonly_pwrite(int i915) */ igt_require(igt_setup_clflush()); + gem_require_pread_pwrite(i915); sz = 16 << 12; pages = mmap(NULL, sz, PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0); diff --git a/tests/i915/gen9_exec_parse.c b/tests/i915/gen9_exec_parse.c index 8cd82f568..eddc0f871 100644 --- a/tests/i915/gen9_exec_parse.c +++ b/tests/i915/gen9_exec_parse.c @@ -1029,8 +1029,10 @@ igt_main -EINVAL); } - igt_subtest("batch-invalid-length") + igt_subtest("batch-invalid-length") { + gem_require_pread_pwrite(i915); test_invalid_length(i915, handle); + } igt_subtest("basic-rejected") test_rejected(i915, handle, false); -- 2.27.0.112.g101b3204f3 _______________________________________________ igt-dev mailing list igt-dev@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/igt-dev