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Re: [RFC PATCH v3 04/12] netdev: support binding dma-buf to netdevice

by Jakub Kicinski

On Sun, 5 Nov 2023 18:44:03 -0800 Mina Almasry wrote: > --- a/include/linux/netdevice.h > +++ b/include/linux/netdevice.h > @@ -52,6 +52,8 @@ > #include <net/net_trackers.h> > #include <net/net_debug.h> > #include <net/dropreason-core.h> > +#include <linux/xarray.h> > +#include <linux/refcount.h> > > struct netpoll_info; > struct device; > @@ -808,6 +810,84 @@ bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index, u32 flow_id, > #endif > #endif /* CONFIG_RPS */ > > +struct netdev_dmabuf_binding { Similar nitpick to the skbuff.h comment. Take this somewhere else, please, it doesn't need to be included in netdevice.h > + struct netdev_dmabuf_binding *rbinding; the 'r' in rbinding stands for rx? 🤔️

2 years, 3 months

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Re: [RFC PATCH v3 08/12] net: support non paged skb frags

by Jakub Kicinski

On Sun, 5 Nov 2023 18:44:07 -0800 Mina Almasry wrote: > #include <net/net_debug.h> > #include <net/dropreason-core.h> > +#include <net/page_pool/types.h> > +#include <net/page_pool/helpers.h> > /** > * DOC: skb checksums > @@ -3402,15 +3404,38 @@ static inline void skb_frag_off_copy(skb_frag_t *fragto, > fragto->bv_offset = fragfrom->bv_offset; > } > > +/* Returns true if the skb_frag contains a page_pool_iov. */ > +static inline bool skb_frag_is_page_pool_iov(const skb_frag_t *frag) > +{ > + return page_is_page_pool_iov(frag->bv_page); > +} Maybe we can create a new header? For skb + page pool. skbuff.h is included by 1/4th of the kernel objects, we should not be adding dependencies to this header, it really slows down incremental builds.

2 years, 3 months

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Re: [RFC PATCH v3 09/12] net: add support for skbs with unreadable frags

by Jakub Kicinski

On Tue, 7 Nov 2023 11:53:22 -0800 Mina Almasry wrote: > My bad on not including some docs about this. The next version should > have the commit message beefed up to explain all this, or a docs > patch. Yes, please. Would be great to have the user facing interface well explained under Documentation/

2 years, 3 months

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Re: [RFC PATCH v3 10/12] tcp: RX path for devmem TCP

by Jakub Kicinski

On Sun, 5 Nov 2023 18:44:09 -0800 Mina Almasry wrote: > + if (!skb_frags_not_readable(skb)) { nit: maybe call the helper skb_frags_readable() and flip the polarity, avoid double negatives.

2 years, 3 months

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Re: [RFC PATCH v3 02/12] net: page_pool: create hooks for custom page providers

by Jakub Kicinski

On Sun, 5 Nov 2023 18:44:01 -0800 Mina Almasry wrote: > diff --git a/include/net/page_pool/types.h b/include/net/page_pool/types.h > index 6fc5134095ed..d4bea053bb7e 100644 > --- a/include/net/page_pool/types.h > +++ b/include/net/page_pool/types.h > @@ -60,6 +60,8 @@ struct page_pool_params { > int nid; > struct device *dev; > struct napi_struct *napi; > + u8 memory_provider; > + void *mp_priv; > enum dma_data_direction dma_dir; > unsigned int max_len; > unsigned int offset; you should rebase on top of net-next More importantly I was expecting those fields to be gone from params. The fact that the page pool is configured to a specific provider should be fully transparent to the driver, driver should just tell the core what queue its creating the pool from and if there's a dmabuf bound for that queue - out pops a pp backed by the dmabuf. My RFC had the page pool params fields here as a hack.

2 years, 3 months

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Re: [RFC PATCH v3 12/12] selftests: add ncdevmem, netcat for devmem TCP

by Jakub Kicinski

On Sun, 5 Nov 2023 18:44:11 -0800 Mina Almasry wrote: > + if (ynl_subscribe(*ys, "mgmt")) > + goto err_close; Why? :)

2 years, 3 months

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Re: [RFC PATCH v3 09/12] net: add support for skbs with unreadable frags

by Jakub Kicinski

On Tue, 7 Nov 2023 14:23:20 -0800 Stanislav Fomichev wrote: > Can we mark a socket as devmem-only? Do we have any use-case for those > hybrid setups? Or, let me put it that way: do we expect API callers > to handle both linear and non-linear cases correctly? > As a consumer of the previous versions of these apis internally, > I find all those corner cases confusing :-( Hence trying to understand > whether we can make it a bit more rigid and properly defined upstream. FWIW I'd also prefer to allow mixing. "Some NICs" can decide HDS very flexibly, incl. landing full jumbo frames into the "headers". There's no sender API today to signal how to mark the data for selective landing, but if Mina already has the rx side written to allow that...

2 years, 3 months

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Re: [RFC PATCH v3 03/12] net: netdev netlink api to bind dma-buf to a net device

by Jakub Kicinski

On Sun, 5 Nov 2023 18:44:02 -0800 Mina Almasry wrote: > + - > + name: queues > + doc: receive queues to bind the dma-buf to. > + type: u32 > + multi-attr: true I think that you should throw in the queue type. I know you made the op imply RX: > + - > + name: bind-rx but if we decide to create a separate "type" for some magic queue type one day we'll have to ponder how to extend this API IMHO queue should be identified by a <type, id> tuple, always.

2 years, 3 months

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Re: [RFC PATCH v3 06/12] memory-provider: dmabuf devmem memory provider

by Jakub Kicinski

On Sun, 5 Nov 2023 18:44:05 -0800 Mina Almasry wrote: > +static int mp_dmabuf_devmem_init(struct page_pool *pool) > +{ > + struct netdev_dmabuf_binding *binding = pool->mp_priv; > + > + if (!binding) > + return -EINVAL; > + > + if (pool->p.flags & PP_FLAG_DMA_MAP || > + pool->p.flags & PP_FLAG_DMA_SYNC_DEV) > + return -EOPNOTSUPP; This looks backwards, we should _force_ the driver to use the dma mapping built into the page pool APIs, to isolate the driver from how the DMA addr actually gets obtained. Right? Maybe seeing driver patches would illuminate.

2 years, 3 months

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Re: [RFC PATCH v3 10/12] tcp: RX path for devmem TCP

by Jakub Kicinski

On Thu, 09 Nov 2023 12:05:37 +0100 Paolo Abeni wrote: > > I suppose we just disagree on the elegance of the API. > > FWIW, I think sockopt +cmsg is the right API. FWIW it's fine by me as well.

2 years, 3 months

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Re: [RFC PATCH v3 12/12] selftests: add ncdevmem, netcat for devmem TCP

by Jakub Kicinski

My brain is slightly fried after trying to catch up on the thread for close to 2h. So forgive me if I'm missing something. This applies to all emails I'm about to send :) On Sun, 5 Nov 2023 18:44:11 -0800 Mina Almasry wrote: > + trigger_device_reset(); The user space must not be responsible for the reset. We can add some temporary "recreate page pools" ndo until the queue API is ready. But it should not be visible to the user in any way. And then the kernel can issue the same reset when the netlink socket dies to flush device free lists. Maybe we should also add a "allow device/all-queues reload" flag to the netlink API to differentiate drivers which can't implement full queue API later on. We want to make sure the defaults work well in our "target design", rather than at the first stage. And target design will reload queues one by one.

2 years, 3 months

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Re: [RFC PATCH v2] drm/test: add a test suite for GEM objects backed by shmem

by Maxime Ripard

On Wed, Nov 08, 2023 at 02:42:03PM +0100, Marco Pagani wrote: > This patch introduces an initial KUnit test suite for GEM objects > backed by shmem buffers. > > Suggested-by: Javier Martinez Canillas <javierm(a)redhat.com> > Signed-off-by: Marco Pagani <marpagan(a)redhat.com> > > v2: > - Improved description of test cases > - Cleaner error handling using KUnit actions > - Alphabetical order in Kconfig and Makefile > --- > drivers/gpu/drm/Kconfig | 9 +- > drivers/gpu/drm/tests/Makefile | 5 +- > drivers/gpu/drm/tests/drm_gem_shmem_test.c | 381 +++++++++++++++++++++ > 3 files changed, 389 insertions(+), 6 deletions(-) > create mode 100644 drivers/gpu/drm/tests/drm_gem_shmem_test.c > > diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig > index 3eee8636f847..a2551c8c393a 100644 > --- a/drivers/gpu/drm/Kconfig > +++ b/drivers/gpu/drm/Kconfig > @@ -76,14 +76,15 @@ config DRM_KUNIT_TEST > tristate "KUnit tests for DRM" if !KUNIT_ALL_TESTS > depends on DRM && KUNIT > select PRIME_NUMBERS > + select DRM_BUDDY > select DRM_DISPLAY_DP_HELPER > select DRM_DISPLAY_HELPER > - select DRM_LIB_RANDOM > - select DRM_KMS_HELPER > - select DRM_BUDDY > + select DRM_EXEC > select DRM_EXPORT_FOR_TESTS if m > + select DRM_GEM_SHMEM_HELPER > + select DRM_KMS_HELPER > select DRM_KUNIT_TEST_HELPERS > - select DRM_EXEC > + select DRM_LIB_RANDOM > default KUNIT_ALL_TESTS > help > This builds unit tests for DRM. This option is not useful for > diff --git a/drivers/gpu/drm/tests/Makefile b/drivers/gpu/drm/tests/Makefile > index ba7baa622675..d6183b3d7688 100644 > --- a/drivers/gpu/drm/tests/Makefile > +++ b/drivers/gpu/drm/tests/Makefile > @@ -9,15 +9,16 @@ obj-$(CONFIG_DRM_KUNIT_TEST) += \ > drm_connector_test.o \ > drm_damage_helper_test.o \ > drm_dp_mst_helper_test.o \ > + drm_exec_test.o \ > drm_format_helper_test.o \ > drm_format_test.o \ > drm_framebuffer_test.o \ > + drm_gem_shmem_test.o \ > drm_managed_test.o \ > drm_mm_test.o \ > drm_modes_test.o \ > drm_plane_helper_test.o \ > drm_probe_helper_test.o \ > - drm_rect_test.o \ > - drm_exec_test.o > + drm_rect_test.o Thanks for reordering the tests and symbols, but they should part of a preliminary patch. > CFLAGS_drm_mm_test.o := $(DISABLE_STRUCTLEAK_PLUGIN) > diff --git a/drivers/gpu/drm/tests/drm_gem_shmem_test.c b/drivers/gpu/drm/tests/drm_gem_shmem_test.c > new file mode 100644 > index 000000000000..983380490673 > --- /dev/null > +++ b/drivers/gpu/drm/tests/drm_gem_shmem_test.c > @@ -0,0 +1,381 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * KUnit test suite for GEM objects backed by shmem buffers > + * > + * Copyright (C) 2023 Red Hat, Inc. > + * > + * Author: Marco Pagani <marpagan(a)redhat.com> > + */ > + > +#include <linux/dma-buf.h> > +#include <linux/iosys-map.h> > +#include <linux/sizes.h> > + > +#include <kunit/test.h> > + > +#include <drm/drm_device.h> > +#include <drm/drm_drv.h> > +#include <drm/drm_gem.h> > +#include <drm/drm_gem_shmem_helper.h> > +#include <drm/drm_kunit_helpers.h> > + > +#define TEST_SIZE SZ_1M > +#define TEST_BYTE 0xae > + > +struct fake_dev { > + struct drm_device drm_dev; > + struct device *dev; AFAICS, you're not using the dev pointer anywhere. You could remove the fake_dev struct entirely and pass the drm_device pointer in test->priv > +}; > + > +/* > + * Wrappers to avoid an explicit type casting when passing action > + * functions to kunit_add_action(). > + */ > +static void kfree_wrapper(void *p) > +{ > + kfree(p); > +} > + > +static void sg_free_table_wrapper(void *sgt) > +{ > + sg_free_table(sgt); > +} > + > +static void drm_gem_shmem_free_wrapper(void *shmem) > +{ > + drm_gem_shmem_free(shmem); > +} I think you need to explicitly cast the pointer (or do a temporary assignment to the proper type) to avoid a compiler warning. > +/* > + * Test creating a shmem GEM object backed by shmem buffer. The test > + * case succeeds if the GEM object is successfully allocated with the > + * shmem file node and object functions attributes set, and the size > + * attribute is equal to the correct size. > + */ Thanks for all those comments, it's super helpful > +static void drm_gem_shmem_test_obj_create(struct kunit *test) > +{ > + struct fake_dev *fdev = test->priv; > + struct drm_gem_shmem_object *shmem; > + > + shmem = drm_gem_shmem_create(&fdev->drm_dev, TEST_SIZE); > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, shmem); > + KUNIT_EXPECT_EQ(test, shmem->base.size, TEST_SIZE); > + KUNIT_EXPECT_NOT_NULL(test, shmem->base.filp); > + KUNIT_EXPECT_NOT_NULL(test, shmem->base.funcs); > + > + drm_gem_shmem_free(shmem); > +} > + > +/* > + * Test creating a shmem GEM object from a scatter/gather table exported > + * via a DMA-BUF. The test case succeed if the GEM object is successfully > + * created with the shmem file node attribute equal to NULL and the sgt > + * attribute pointing to the scatter/gather table that has been imported. > + */ > +static void drm_gem_shmem_test_obj_create_private(struct kunit *test) > +{ > + struct fake_dev *fdev = test->priv; > + struct drm_gem_shmem_object *shmem; > + struct drm_gem_object *gem_obj; > + struct dma_buf buf_mock; > + struct dma_buf_attachment attach_mock; > + struct sg_table *sgt; > + char *buf; > + int ret; > + > + /* Create a mock scatter/gather table */ > + buf = kunit_kzalloc(test, TEST_SIZE, GFP_KERNEL); > + KUNIT_ASSERT_NOT_NULL(test, buf); > + > + sgt = kzalloc(sizeof(*sgt), GFP_KERNEL); > + KUNIT_ASSERT_NOT_NULL(test, sgt); > + > + ret = kunit_add_action_or_reset(test, kfree_wrapper, sgt); > + KUNIT_ASSERT_EQ(test, ret, 0); > + > + ret = sg_alloc_table(sgt, 1, GFP_KERNEL); > + KUNIT_ASSERT_EQ(test, ret, 0); > + > + ret = kunit_add_action_or_reset(test, sg_free_table_wrapper, sgt); > + KUNIT_ASSERT_EQ(test, ret, 0); > + > + sg_init_one(sgt->sgl, buf, TEST_SIZE); > + > + /* Init a mock DMA-BUF */ > + buf_mock.size = TEST_SIZE; > + attach_mock.dmabuf = &buf_mock; > + > + gem_obj = drm_gem_shmem_prime_import_sg_table(&fdev->drm_dev, &attach_mock, sgt); > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, gem_obj); > + KUNIT_EXPECT_EQ(test, gem_obj->size, TEST_SIZE); > + KUNIT_EXPECT_NULL(test, gem_obj->filp); > + KUNIT_EXPECT_NOT_NULL(test, gem_obj->funcs); > + > + /* The scatter/gather table will be freed by drm_gem_shmem_free */ > + kunit_remove_action(test, sg_free_table_wrapper, sgt); > + kunit_remove_action(test, kfree_wrapper, sgt); > + > + shmem = to_drm_gem_shmem_obj(gem_obj); > + KUNIT_EXPECT_PTR_EQ(test, shmem->sgt, sgt); > + > + drm_gem_shmem_free(shmem); > +} > + > +/* > + * Test pinning backing pages for a shmem GEM object. The test case > + * succeeds if a suitable number of backing pages are allocated, and > + * the pages table counter attribute is increased by one. > + */ > +static void drm_gem_shmem_test_pin_pages(struct kunit *test) > +{ > + struct fake_dev *fdev = test->priv; > + struct drm_gem_shmem_object *shmem; > + int i, ret; > + > + shmem = drm_gem_shmem_create(&fdev->drm_dev, TEST_SIZE); > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, shmem); > + KUNIT_EXPECT_NULL(test, shmem->pages); > + KUNIT_EXPECT_EQ(test, shmem->pages_use_count, 0); > + > + ret = kunit_add_action_or_reset(test, drm_gem_shmem_free_wrapper, shmem); > + KUNIT_ASSERT_EQ(test, ret, 0); > + > + ret = drm_gem_shmem_pin(shmem); > + KUNIT_ASSERT_EQ(test, ret, 0); > + KUNIT_ASSERT_NOT_NULL(test, shmem->pages); > + KUNIT_EXPECT_EQ(test, shmem->pages_use_count, 1); > + > + for (i = 0; i < (shmem->base.size >> PAGE_SHIFT); i++) > + KUNIT_ASSERT_NOT_NULL(test, shmem->pages[i]); > + > + drm_gem_shmem_unpin(shmem); > + KUNIT_EXPECT_NULL(test, shmem->pages); > + KUNIT_EXPECT_EQ(test, shmem->pages_use_count, 0); > +} > + > +/* > + * Test creating a virtual mapping for a shmem GEM object. The test > + * case succeeds if the backing memory is mapped and the reference > + * counter for virtual mapping is increased by one. Moreover, the test > + * case writes and then reads a test pattern over the mapped memory. > + */ > +static void drm_gem_shmem_test_vmap(struct kunit *test) > +{ > + struct fake_dev *fdev = test->priv; > + struct drm_gem_shmem_object *shmem; > + struct iosys_map map; > + int ret, i; > + > + shmem = drm_gem_shmem_create(&fdev->drm_dev, TEST_SIZE); > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, shmem); > + KUNIT_EXPECT_NULL(test, shmem->vaddr); > + KUNIT_EXPECT_EQ(test, shmem->vmap_use_count, 0); > + > + ret = kunit_add_action_or_reset(test, drm_gem_shmem_free_wrapper, shmem); > + KUNIT_ASSERT_EQ(test, ret, 0); > + > + ret = drm_gem_shmem_vmap(shmem, &map); > + KUNIT_ASSERT_EQ(test, ret, 0); > + KUNIT_ASSERT_NOT_NULL(test, shmem->vaddr); > + KUNIT_ASSERT_FALSE(test, iosys_map_is_null(&map)); > + KUNIT_EXPECT_EQ(test, shmem->vmap_use_count, 1); > + > + iosys_map_memset(&map, 0, TEST_BYTE, TEST_SIZE); > + for (i = 0; i < TEST_SIZE; i++) > + KUNIT_EXPECT_EQ(test, iosys_map_rd(&map, i, u8), TEST_BYTE); > + > + drm_gem_shmem_vunmap(shmem, &map); > + KUNIT_EXPECT_NULL(test, shmem->vaddr); > + KUNIT_EXPECT_EQ(test, shmem->vmap_use_count, 0); > +} > + > +/* > + * Test exporting a scatter/gather table of pinned pages suitable for > + * PRIME usage from a shmem GEM object. The test case succeeds if a > + * scatter/gather table large enough to accommodate the backing memory > + * is successfully exported. > + */ > +static void drm_gem_shmem_test_get_pages_sgt(struct kunit *test) > +{ > + struct fake_dev *fdev = test->priv; > + struct drm_gem_shmem_object *shmem; > + struct sg_table *sgt; > + struct scatterlist *sg; > + unsigned int si, len = 0; > + int ret; > + > + shmem = drm_gem_shmem_create(&fdev->drm_dev, TEST_SIZE); > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, shmem); > + > + ret = kunit_add_action_or_reset(test, drm_gem_shmem_free_wrapper, shmem); > + KUNIT_ASSERT_EQ(test, ret, 0); > + > + ret = drm_gem_shmem_pin(shmem); > + KUNIT_ASSERT_EQ(test, ret, 0); > + > + sgt = drm_gem_shmem_get_sg_table(shmem); > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, sgt); > + KUNIT_EXPECT_NULL(test, shmem->sgt); > + > + ret = kunit_add_action_or_reset(test, sg_free_table_wrapper, sgt); > + KUNIT_ASSERT_EQ(test, ret, 0); > + > + for_each_sgtable_sg(sgt, sg, si) { > + KUNIT_EXPECT_NOT_NULL(test, sg); > + len += sg->length; > + } > + > + KUNIT_EXPECT_GE(test, len, TEST_SIZE); > +} > + > +/* > + * Test pinning pages and exporting a scatter/gather table suitable for > + * driver usage from a shmem GEM object. The test case succeeds if the > + * backing pages are pinned and a scatter/gather table large enough to > + * accommodate the backing memory is successfully exported. > + */ > +static void drm_gem_shmem_test_get_sg_table(struct kunit *test) > +{ > + struct fake_dev *fdev = test->priv; > + struct drm_gem_shmem_object *shmem; > + struct sg_table *sgt; > + struct scatterlist *sg; > + unsigned int si, len, ret = 0; > + > + shmem = drm_gem_shmem_create(&fdev->drm_dev, TEST_SIZE); > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, shmem); > + > + ret = kunit_add_action_or_reset(test, drm_gem_shmem_free_wrapper, shmem); > + KUNIT_ASSERT_EQ(test, ret, 0); > + > + /* The scatter/gather table will be freed by drm_gem_shmem_free */ > + sgt = drm_gem_shmem_get_pages_sgt(shmem); > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, sgt); > + KUNIT_ASSERT_NOT_NULL(test, shmem->pages); > + KUNIT_EXPECT_EQ(test, shmem->pages_use_count, 1); > + KUNIT_EXPECT_PTR_EQ(test, sgt, shmem->sgt); > + > + for_each_sgtable_sg(sgt, sg, si) { > + KUNIT_EXPECT_NOT_NULL(test, sg); > + len += sg->length; > + } > + > + KUNIT_EXPECT_GE(test, len, TEST_SIZE); > +} > + > +/* > + * Test updating the madvise state of a shmem GEM object. The test > + * case checks that the function for setting madv updates it only if > + * its current value is greater or equal than zero and returns false > + * if it has a negative value. > + */ > +static void drm_gem_shmem_test_madvise(struct kunit *test) > +{ > + struct fake_dev *fdev = test->priv; > + struct drm_gem_shmem_object *shmem; > + int ret; > + > + shmem = drm_gem_shmem_create(&fdev->drm_dev, TEST_SIZE); > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, shmem); > + KUNIT_ASSERT_EQ(test, shmem->madv, 0); > + > + ret = kunit_add_action_or_reset(test, drm_gem_shmem_free_wrapper, shmem); > + KUNIT_ASSERT_EQ(test, ret, 0); > + > + ret = drm_gem_shmem_madvise(shmem, 1); > + KUNIT_EXPECT_TRUE(test, ret); > + KUNIT_ASSERT_EQ(test, shmem->madv, 1); > + > + /* Set madv to a negative value */ > + ret = drm_gem_shmem_madvise(shmem, -1); > + KUNIT_EXPECT_FALSE(test, ret); > + KUNIT_ASSERT_EQ(test, shmem->madv, -1); > + > + /* Check that madv cannot be set back to a positive value */ > + ret = drm_gem_shmem_madvise(shmem, 0); > + KUNIT_EXPECT_FALSE(test, ret); > + KUNIT_ASSERT_EQ(test, shmem->madv, -1); > +} > + > +/* > + * Test purging a shmem GEM object. First, assert that a newly created > + * shmem GEM object is not purgeable. Then, set madvise to a positive > + * value and call drm_gem_shmem_get_pages_sgt() to pin and dma-map the > + * backing pages. Finally, assert that the shmem GEM object is now > + * purgeable and purge it. > + */ > +static void drm_gem_shmem_test_purge(struct kunit *test) > +{ > + struct fake_dev *fdev = test->priv; > + struct drm_gem_shmem_object *shmem; > + struct sg_table *sgt; > + int ret; > + > + shmem = drm_gem_shmem_create(&fdev->drm_dev, TEST_SIZE); > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, shmem); > + > + ret = kunit_add_action_or_reset(test, drm_gem_shmem_free_wrapper, shmem); > + KUNIT_ASSERT_EQ(test, ret, 0); > + > + ret = drm_gem_shmem_is_purgeable(shmem); > + KUNIT_EXPECT_FALSE(test, ret); > + > + ret = drm_gem_shmem_madvise(shmem, 1); > + KUNIT_EXPECT_TRUE(test, ret); > + > + /* The scatter/gather table will be freed by drm_gem_shmem_free */ > + sgt = drm_gem_shmem_get_pages_sgt(shmem); > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, sgt); > + > + ret = drm_gem_shmem_is_purgeable(shmem); > + KUNIT_EXPECT_TRUE(test, ret); > + > + drm_gem_shmem_purge(shmem); > + KUNIT_EXPECT_NULL(test, shmem->pages); > + KUNIT_EXPECT_NULL(test, shmem->sgt); > + KUNIT_EXPECT_EQ(test, shmem->madv, -1); > +} > + > +static int drm_gem_shmem_test_init(struct kunit *test) > +{ > + struct fake_dev *fdev; > + struct device *dev; > + > + /* Allocate a parent device */ > + dev = drm_kunit_helper_alloc_device(test); > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, dev); > + > + /* > + * The DRM core will automatically initialize the GEM core and create > + * a DRM Memory Manager object which provides an address space pool > + * for GEM objects allocation. > + */ > + fdev = drm_kunit_helper_alloc_drm_device(test, dev, struct fake_dev, > + drm_dev, DRIVER_GEM); > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, fdev); > + > + fdev->dev = dev; > + test->priv = fdev; > + > + return 0; > +} > + > +static struct kunit_case drm_gem_shmem_test_cases[] = { > + KUNIT_CASE(drm_gem_shmem_test_obj_create), > + KUNIT_CASE(drm_gem_shmem_test_obj_create_private), > + KUNIT_CASE(drm_gem_shmem_test_pin_pages), > + KUNIT_CASE(drm_gem_shmem_test_vmap), > + KUNIT_CASE(drm_gem_shmem_test_get_pages_sgt), > + KUNIT_CASE(drm_gem_shmem_test_get_sg_table), > + KUNIT_CASE(drm_gem_shmem_test_madvise), > + KUNIT_CASE(drm_gem_shmem_test_purge), > + {} > +}; > + > +static struct kunit_suite drm_gem_shmem_suite = { > + .name = "drm_gem_shmem", > + .init = drm_gem_shmem_test_init, > + .test_cases = drm_gem_shmem_test_cases > +}; > + > +kunit_test_suite(drm_gem_shmem_suite); Looks great otherwise, thanks! Maxime

2 years, 3 months

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Re: [RFC PATCH v3 07/12] page-pool: device memory support

by Christian König

Am 09.11.23 um 04:20 schrieb Mina Almasry: > [SNIP] >> But we might be able to do something as folio is doing now, mm subsystem >> is still seeing 'struct folio/page', but other subsystem like slab is using >> 'struct slab', and there is still some common fields shared between >> 'struct folio' and 'struct slab'. >> > In my eyes this is almost exactly what I suggested in RFC v1 and got > immediately nacked with no room to negotiate. What we did for v1 is to > allocate struct pages for dma-buf to make dma-bufs look like struct > page to mm subsystem. Almost exactly what you're describing above. > It's a no-go. I don't think renaming struct page to netmem is going to > move the needle (it also re-introduces code-churn). What I feel like I > learnt is that dma-bufs are not struct pages and can't be made to look > like one, I think. Yeah, that pretty much hits the nail on the head. What was not mentioned yet and you could potentially try to do is to go the other way around. In other words instead of importing a DMA-buf file descriptor into the page-pool, you take some netdev page-pool pages and export them as DMA-buf handle. All you then need to do is to implement the necessary DMA-buf interface, e.g. wait for DMA-fences before accessing stuff, when you have an async operation install a DMA-fence so that other can wait for your operation to finish etc.. etc.. This still doesn't gives you peer 2 peer over for example the PCIe bus, but it would give you zero copy in the sense that a GPU or other acceleration device directly writes stuff into memory a network device can work with. We already have some similar functionality for at least Intel and AMD hw where an userptr mechanism is used to make malloced memory (backed by normal struct pages) available to the GPU. The problem with this approach is that most GPUs currently can't do good recoverable page faults which in turn makes the whole MMU notifier based approach just horrible inefficient. Just giving a few more pointers you might want to look into... Cheers, Christian.

2 years, 3 months

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[syzbot] [dri?] kernel BUG in vmf_insert_pfn_prot (2)

by syzbot

Hello, syzbot found the following issue on: HEAD commit: 9e6c269de404 Merge tag 'i2c-for-6.5-rc7' of git://git.kern.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=110b32d3a80000 kernel config: https://syzkaller.appspot.com/x/.config?x=aa796b6080b04102 dashboard link: https://syzkaller.appspot.com/bug?extid=398e17b61dab22cc56bc compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14284307a80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/481d8421bfb2/disk-9e6c269d.raw… vmlinux: https://storage.googleapis.com/syzbot-assets/5ec626f94634/vmlinux-9e6c269d.… kernel image: https://storage.googleapis.com/syzbot-assets/ab1e59619bd6/bzImage-9e6c269d.… IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+398e17b61dab22cc56bc(a)syzkaller.appspotmail.com ------------[ cut here ]------------ kernel BUG at mm/memory.c:2214! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 5157 Comm: syz-executor.3 Not tainted 6.5.0-rc6-syzkaller-00253-g9e6c269de404 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 RIP: 0010:vmf_insert_pfn_prot+0x247/0x430 mm/memory.c:2214 Code: 0f 0b e8 0c 4f c0 ff 49 89 ef bf 20 00 00 00 41 83 e7 28 4c 89 fe e8 88 4a c0 ff 49 83 ff 20 0f 85 aa fe ff ff e8 e9 4e c0 ff <0f> 0b 48 bd ff ff ff ff ff ff 0f 00 e8 d8 4e c0 ff 4c 89 f6 48 89 RSP: 0018:ffffc9000415f750 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff8880275a0d00 RCX: 0000000000000000 RDX: ffff888018379dc0 RSI: ffffffff81c5b9b7 RDI: 0000000000000007 RBP: 000000000c140477 R08: 0000000000000007 R09: 0000000000000020 R10: 0000000000000020 R11: 000000000000001f R12: 0000000020ffc000 R13: 1ffff9200082beeb R14: 000000000007e79e R15: 0000000000000020 FS: 00007f235bd9a6c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020ffc000 CR3: 0000000022a32000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> drm_gem_shmem_fault+0x1ea/0x3a0 drivers/gpu/drm/drm_gem_shmem_helper.c:563 __do_fault+0x107/0x5f0 mm/memory.c:4198 do_read_fault mm/memory.c:4547 [inline] do_fault mm/memory.c:4670 [inline] do_pte_missing mm/memory.c:3664 [inline] handle_pte_fault mm/memory.c:4939 [inline] __handle_mm_fault+0x27e0/0x3b80 mm/memory.c:5079 handle_mm_fault+0x2ab/0x9d0 mm/memory.c:5233 do_user_addr_fault+0x446/0xfc0 arch/x86/mm/fault.c:1392 handle_page_fault arch/x86/mm/fault.c:1486 [inline] exc_page_fault+0x5c/0xd0 arch/x86/mm/fault.c:1542 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 RIP: 0010:rep_movs_alternative+0x4a/0xb0 arch/x86/lib/copy_user_64.S:71 Code: 75 f1 c3 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 df 83 f9 08 73 e8 eb c9 <f3> a4 c3 0f 1f 00 4c 8b 06 4c 8b 4e 08 4c 8b 56 10 4c 8b 5e 18 4c RSP: 0018:ffffc9000415fb50 EFLAGS: 00050206 RAX: 0000000000000001 RBX: 0000000020ffc000 RCX: 0000000000001000 RDX: 0000000000000000 RSI: 0000000020ffc000 RDI: ffff88807b764000 RBP: 0000000000001000 R08: 0000000000000001 R09: ffffed100f6ec9ff R10: ffff88807b764fff R11: 0000000000000000 R12: 0000000020ffd000 R13: ffff88807b764000 R14: 0000000000000000 R15: 0000000020ffc000 copy_user_generic arch/x86/include/asm/uaccess_64.h:112 [inline] raw_copy_from_user arch/x86/include/asm/uaccess_64.h:127 [inline] _copy_from_user+0xc2/0xf0 lib/usercopy.c:23 copy_from_user include/linux/uaccess.h:183 [inline] snd_rawmidi_kernel_write1+0x360/0x860 sound/core/rawmidi.c:1618 snd_rawmidi_write+0x278/0xc10 sound/core/rawmidi.c:1687 vfs_write+0x2a4/0xe40 fs/read_write.c:582 ksys_write+0x1f0/0x250 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f235b07cae9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f235bd9a0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f235b19bf80 RCX: 00007f235b07cae9 RDX: 00000000fffffd2c RSI: 0000000020000000 RDI: 0000000000000005 RBP: 00007f235b0c847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f235b19bf80 R15: 00007ffd9cdf0fe8 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:vmf_insert_pfn_prot+0x247/0x430 mm/memory.c:2214 Code: 0f 0b e8 0c 4f c0 ff 49 89 ef bf 20 00 00 00 41 83 e7 28 4c 89 fe e8 88 4a c0 ff 49 83 ff 20 0f 85 aa fe ff ff e8 e9 4e c0 ff <0f> 0b 48 bd ff ff ff ff ff ff 0f 00 e8 d8 4e c0 ff 4c 89 f6 48 89 RSP: 0018:ffffc9000415f750 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff8880275a0d00 RCX: 0000000000000000 RDX: ffff888018379dc0 RSI: ffffffff81c5b9b7 RDI: 0000000000000007 RBP: 000000000c140477 R08: 0000000000000007 R09: 0000000000000020 R10: 0000000000000020 R11: 000000000000001f R12: 0000000020ffc000 R13: 1ffff9200082beeb R14: 000000000007e79e R15: 0000000000000020 FS: 00007f235bd9a6c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f93c20ffac1 CR3: 0000000022a32000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 75 f1 jne 0xfffffff3 2: c3 ret 3: 66 66 2e 0f 1f 84 00 data16 cs nopw 0x0(%rax,%rax,1) a: 00 00 00 00 e: 66 90 xchg %ax,%ax 10: 48 8b 06 mov (%rsi),%rax 13: 48 89 07 mov %rax,(%rdi) 16: 48 83 c6 08 add $0x8,%rsi 1a: 48 83 c7 08 add $0x8,%rdi 1e: 83 e9 08 sub $0x8,%ecx 21: 74 df je 0x2 23: 83 f9 08 cmp $0x8,%ecx 26: 73 e8 jae 0x10 28: eb c9 jmp 0xfffffff3 * 2a: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction 2c: c3 ret 2d: 0f 1f 00 nopl (%rax) 30: 4c 8b 06 mov (%rsi),%r8 33: 4c 8b 4e 08 mov 0x8(%rsi),%r9 37: 4c 8b 56 10 mov 0x10(%rsi),%r10 3b: 4c 8b 5e 18 mov 0x18(%rsi),%r11 3f: 4c rex.WR --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller(a)googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the bug is already fixed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup

2 years, 3 months

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Re: [RFC PATCH v3 09/12] net: add support for skbs with unreadable frags

by David Laight

From: Mina Almasry > Sent: 06 November 2023 02:44 > > For device memory TCP, we expect the skb headers to be available in host > memory for access, and we expect the skb frags to be in device memory > and unaccessible to the host. We expect there to be no mixing and > matching of device memory frags (unaccessible) with host memory frags > (accessible) in the same skb. > > Add a skb->devmem flag which indicates whether the frags in this skb > are device memory frags or not. > ... > diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h > index 1fae276c1353..8fb468ff8115 100644 > --- a/include/linux/skbuff.h > +++ b/include/linux/skbuff.h > @@ -805,6 +805,8 @@ typedef unsigned char *sk_buff_data_t; > * @csum_level: indicates the number of consecutive checksums found in > * the packet minus one that have been verified as > * CHECKSUM_UNNECESSARY (max 3) > + * @devmem: indicates that all the fragments in this skb are backed by > + * device memory. > * @dst_pending_confirm: need to confirm neighbour > * @decrypted: Decrypted SKB > * @slow_gro: state present at GRO time, slower prepare step required > @@ -991,7 +993,7 @@ struct sk_buff { > #if IS_ENABLED(CONFIG_IP_SCTP) > __u8 csum_not_inet:1; > #endif > - > + __u8 devmem:1; > #if defined(CONFIG_NET_SCHED) || defined(CONFIG_NET_XGRESS) > __u16 tc_index; /* traffic control index */ > #endif > @@ -1766,6 +1768,12 @@ static inline void skb_zcopy_downgrade_managed(struct sk_buff *skb) > __skb_zcopy_downgrade_managed(skb); > } Doesn't that bloat struct sk_buff? I'm not sure there are any spare bits available. Although CONFIG_NET_SWITCHDEV and CONFIG_NET_SCHED seem to already add padding. David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)

2 years, 3 months

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Re: [RFC PATCH] drm/test: add a test suite for GEM objects backed by shmem

by Maxime Ripard

On Mon, Oct 30, 2023 at 11:58:20AM +0100, Marco Pagani wrote: > On 2023-10-25 10:43, Maxime Ripard wrote: > > On Tue, Oct 24, 2023 at 07:14:25PM +0200, Marco Pagani wrote: > >>>> +static void drm_gem_shmem_test_obj_create_private(struct kunit *test) > >>>> +{ > >>>> + struct fake_dev *fdev = test->priv; > >>>> + struct drm_gem_shmem_object *shmem; > >>>> + struct drm_gem_object *gem_obj; > >>>> + struct dma_buf buf_mock; > >>>> + struct dma_buf_attachment attach_mock; > >>>> + struct sg_table *sgt; > >>>> + char *buf; > >>>> + int ret; > >>>> + > >>>> + /* Create a mock scatter/gather table */ > >>>> + buf = kunit_kzalloc(test, TEST_SIZE, GFP_KERNEL); > >>>> + KUNIT_ASSERT_NOT_NULL(test, buf); > >>>> + > >>>> + sgt = kzalloc(sizeof(*sgt), GFP_KERNEL); > >>>> + KUNIT_ASSERT_NOT_NULL(test, sgt); > >>>> + > >>>> + ret = sg_alloc_table(sgt, 1, GFP_KERNEL); > >>>> + KUNIT_ASSERT_EQ(test, ret, 0); > >>>> + sg_init_one(sgt->sgl, buf, TEST_SIZE); > >>>> + > >>>> + /* Init a mock DMA-BUF */ > >>>> + buf_mock.size = TEST_SIZE; > >>>> + attach_mock.dmabuf = &buf_mock; > >>>> + > >>>> + gem_obj = drm_gem_shmem_prime_import_sg_table(&fdev->drm_dev, &attach_mock, sgt); > >>>> + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, gem_obj); > >>>> + KUNIT_ASSERT_EQ(test, gem_obj->size, TEST_SIZE); > >>>> + KUNIT_ASSERT_NULL(test, gem_obj->filp); > >>>> + KUNIT_ASSERT_NOT_NULL(test, gem_obj->funcs); > >>>> + > >>>> + shmem = to_drm_gem_shmem_obj(gem_obj); > >>>> + KUNIT_ASSERT_PTR_EQ(test, shmem->sgt, sgt); > >>>> + > >>>> + /* The scatter/gather table is freed by drm_gem_shmem_free */ > >>>> + drm_gem_shmem_free(shmem); > >>>> +} > >>> > >>> KUNIT_ASSERT_* will stop the execution of the test on failure, you > >>> should probably use a bit more of KUNIT_EXPECT_* calls otherwise you'll > >>> leak resources. > >>> > >>> You also probably want to use a kunit_action to clean up and avoid that > >>> whole discussion > >>> > >> > >> You are right. I slightly prefer using KUnit expectations (unless actions > >> are strictly necessary) since I feel using actions makes test cases a bit > >> less straightforward to understand. Is this okay for you? > > > > I disagree. Actions make it easier to reason about, even when comparing > > assertion vs expectation > > > > Like, for the call to sg_alloc_table and > > drm_gem_shmem_prime_import_sg_table(), the reasonable use of assert vs > > expect would be something like: > > > > sgt = kzalloc(sizeof(*sgt), GFP_KERNEL); > > KUNIT_ASSERT_NOT_NULL(test, sgt); > > > > ret = sg_alloc_table(sgt, 1, GFP_KERNEL); > > KUNIT_ASSERT_EQ(test, ret, 0); > > > > /* > > * Here, it's already not super clear whether you want to expect vs > > * assert. expect will make you handle the failure case later, assert will > > * force you to call kfree on sgt. Both kind of suck in their own ways. > > */ > > > > sg_init_one(sgt->sgl, buf, TEST_SIZE); > > > > gem_obj = drm_gem_shmem_prime_import_sg_table(&fdev->drm_dev, &attach_mock, sgt); > > KUNIT_ASSERT_NOT_ERR_OR_NULL(test, gem_obj); > > > > /* > > * If the assert fails, we forgot to call sg_free_table(sgt) and kfree(sgt). > > */ > > > > KUNIT_EXPECT_EQ(test, gem_obj->size, TEST_SIZE); > > KUNIT_EXPECT_NULL(test, gem_obj->filp); > > KUNIT_EXPECT_NOT_NULL(test, gem_obj->funcs); > > > > /* > > * And here we have to handle the case where the expectation was wrong, > > * but the test still continued. > > */ > > > > But if you're not using an action, you still have to call kfree(sgt), > > which means that you might still > > > > shmem = to_drm_gem_shmem_obj(gem_obj); > > KUNIT_ASSERT_PTR_EQ(test, shmem->sgt, sgt); > > > > /* > > * If the assertion fails, we now have to call drm_gem_shmem_free(shmem) > > */ > > > > /* The scatter/gather table is freed by drm_gem_shmem_free */ > > drm_gem_shmem_free(shmem); > > > > /* everything's fine now */ > > > > The semantics around drm_gem_shmem_free make it a bit convoluted, but > > doing it using goto/labels, plus handling the assertions and error > > reporting would be difficult. > > > > Using actions, we have: > > > > sgt = kzalloc(sizeof(*sgt), GFP_KERNEL); > > KUNIT_ASSERT_NOT_NULL(test, sgt); > > > > ret = kunit_add_action_or_reset(test, kfree_wrapper, sgt); > > KUNIT_ASSERT_EQ(test, ret, 0); > > > > ret = sg_alloc_table(sgt, 1, GFP_KERNEL); > > KUNIT_ASSERT_EQ(test, ret, 0); > > > > ret = kunit_add_action_or_reset(test, sg_free_table_wrapper, sgt); > > KUNIT_ASSERT_EQ(test, ret, 0); > > > > sg_init_one(sgt->sgl, buf, TEST_SIZE); > > > > gem_obj = drm_gem_shmem_prime_import_sg_table(&fdev->drm_dev, &attach_mock, sgt); > > KUNIT_ASSERT_NOT_ERR_OR_NULL(test, gem_obj); > > KUNIT_EXPECT_EQ(test, gem_obj->size, TEST_SIZE); > > KUNIT_EXPECT_NULL(test, gem_obj->filp); > > KUNIT_EXPECT_NOT_NULL(test, gem_obj->funcs); > > > > /* drm_gem_shmem_free will free the struct sg_table itself */ > > kunit_remove_action(test, sg_free_table_wrapper, sgt); > > kunit_remove_action(test, kfree_wrapper, sgt); > > I agree that using actions makes error handling cleaner. However, I still > have some concerns about the additional complexity that actions introduce. > For instance, I feel these two lines make the testing harness more complex > without asserting any additional property of the component under test. If anything, the API makes it more difficult to deal with. It would actually be harder/messier to handle without an action. > In some sense, I wonder if it is worth worrying about memory leaks when > a test case fails. At that point, the system is already in an inconsistent > state due to a bug in the component under test, so it is unsafe to continue > anyway. I guess the larger issue is: once that code will be merged, we're going to have patches to convert to actions because they make it nicer and fix a couple of issues anyway. So, if it's still the state we're going to end up in, why not doing it right from the beginning? Maxime

2 years, 3 months

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Re: [PATCH 8/9] dt-bindings: reserved-memory: MediaTek: Add reserved memory for SVP

by Yong Wu (吴勇)

On Wed, 2023-11-01 at 11:20 +0530, Jaskaran Singh wrote: > > External email : Please do not click links or open attachments until > you have verified the sender or the content. > On 10/20/2023 3:20 PM, Yong Wu (吴勇) wrote: > > On Thu, 2023-10-19 at 10:16 +0530, Vijayanand Jitta wrote: > >> > >> Instead of having a vendor specific binding for cma area, How > about > >> retrieving > >> > > > https://lore.kernel.org/lkml/1594948208-4739-1-git-send-email-hayashi.kunih… > >> ? > >> dma_heap_add_cma can just associate cma region and create a heap. > So, > >> we can reuse cma heap > >> code for allocation instead of replicating that code here. > >> > > > > Thanks for the reference. I guess we can't use it. There are two > > reasons: > > > > a) The secure heap driver is a pure software driver and we have no > > device for it, therefore we cannot call dma_heap_add_cma. > > > > Hi Yong, > > We're considering using struct cma as the function argument to > dma_heap_add_cma() rather than struct device. Would this help > resolve the problem of usage with dma_heap_add_cma()? Yes. If we use "struct cma", I guess it works. > > > b) The CMA area here is dynamic for SVP. Normally this CMA can be > used > > in the kernel. In the SVP case we use cma_alloc to get it and pass > the > > entire CMA physical start address and size into TEE to protect the > CMA > > region. The original CMA heap cannot help with the TEE part. > > > > Referring the conversation at > https://lore.kernel.org/lkml/7a2995de23c24ef22c071c6976c02b97e9b50126.camel… > ; > > since we're considering abstracting secure mem ops, would it make > sense > to use the default CMA heap ops (cma_heap_ops), allocate buffers from > it > and secure each allocated buffer? Then it looks you also need tee operation like tee_client_open_session and tee_client_invoke_func, right? It seems we also need change a bit for "cma_heap_allocate" to allow cma support operations from secure heap. I will send a v2 to move the discussion forward. The v2 is based on our case, It won't include the cma part. > > Thanks, > Jaskaran. > > > Thanks. > > > >> Thanks, > >> Vijay > >> > >> > >> >

2 years, 3 months

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[PATCH 0/9] dma-buf: heaps: Add MediaTek secure heap

by Yong Wu

This patchset consists of two parts, the first is from John and TJ. It adds some heap interfaces, then our kernel users could allocate buffer from special heap. The second part is adding MTK secure heap for SVP (Secure Video Path). A total of two heaps are added, one is mtk_svp and the other is mtk_svp_cma. The mtk_svp buffer is reserved for the secure world after bootup and it is used for ES/working buffer, while the mtk_svp_cma buffer is dynamically reserved for the secure world and will be get ready when we start playing secure videos, this heap is used for the frame buffer. Once the security video playing is complete, the CMA will be released. For easier viewing, I've split the new heap file into several patches. The consumers of new heap and new interfaces are our codec and drm which will send upstream soon, probably this week. Base on v6.6-rc1. John Stultz (2): dma-heap: Add proper kref handling on dma-buf heaps dma-heap: Provide accessors so that in-kernel drivers can allocate dmabufs from specific heaps T.J. Mercier (1): dma-buf: heaps: Deduplicate docs and adopt common format Yong Wu (6): dma-buf: heaps: Initialise MediaTek secure heap dma-buf: heaps: mtk_sec_heap: Initialise tee session dma-buf: heaps: mtk_sec_heap: Add tee service call for buffer allocating/freeing dma-buf: heaps: mtk_sec_heap: Add dma_ops dt-bindings: reserved-memory: MediaTek: Add reserved memory for SVP dma_buf: heaps: mtk_sec_heap: Add a new CMA heap .../mediatek,secure_cma_chunkmem.yaml | 42 ++ drivers/dma-buf/dma-heap.c | 127 +++-- drivers/dma-buf/heaps/Kconfig | 8 + drivers/dma-buf/heaps/Makefile | 1 + drivers/dma-buf/heaps/mtk_secure_heap.c | 458 ++++++++++++++++++ include/linux/dma-heap.h | 42 +- 6 files changed, 630 insertions(+), 48 deletions(-) create mode 100644 Documentation/devicetree/bindings/reserved-memory/mediatek,secure_cma_chunkmem.yaml create mode 100644 drivers/dma-buf/heaps/mtk_secure_heap.c -- 2.18.0

2 years, 3 months

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Re: [RFC PATCH] drm/test: add a test suite for GEM objects backed by shmem

by Maxime Ripard

Hi, On Tue, Oct 24, 2023 at 07:14:25PM +0200, Marco Pagani wrote: > >> +static void drm_gem_shmem_test_obj_create_private(struct kunit *test) > >> +{ > >> + struct fake_dev *fdev = test->priv; > >> + struct drm_gem_shmem_object *shmem; > >> + struct drm_gem_object *gem_obj; > >> + struct dma_buf buf_mock; > >> + struct dma_buf_attachment attach_mock; > >> + struct sg_table *sgt; > >> + char *buf; > >> + int ret; > >> + > >> + /* Create a mock scatter/gather table */ > >> + buf = kunit_kzalloc(test, TEST_SIZE, GFP_KERNEL); > >> + KUNIT_ASSERT_NOT_NULL(test, buf); > >> + > >> + sgt = kzalloc(sizeof(*sgt), GFP_KERNEL); > >> + KUNIT_ASSERT_NOT_NULL(test, sgt); > >> + > >> + ret = sg_alloc_table(sgt, 1, GFP_KERNEL); > >> + KUNIT_ASSERT_EQ(test, ret, 0); > >> + sg_init_one(sgt->sgl, buf, TEST_SIZE); > >> + > >> + /* Init a mock DMA-BUF */ > >> + buf_mock.size = TEST_SIZE; > >> + attach_mock.dmabuf = &buf_mock; > >> + > >> + gem_obj = drm_gem_shmem_prime_import_sg_table(&fdev->drm_dev, &attach_mock, sgt); > >> + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, gem_obj); > >> + KUNIT_ASSERT_EQ(test, gem_obj->size, TEST_SIZE); > >> + KUNIT_ASSERT_NULL(test, gem_obj->filp); > >> + KUNIT_ASSERT_NOT_NULL(test, gem_obj->funcs); > >> + > >> + shmem = to_drm_gem_shmem_obj(gem_obj); > >> + KUNIT_ASSERT_PTR_EQ(test, shmem->sgt, sgt); > >> + > >> + /* The scatter/gather table is freed by drm_gem_shmem_free */ > >> + drm_gem_shmem_free(shmem); > >> +} > > > > KUNIT_ASSERT_* will stop the execution of the test on failure, you > > should probably use a bit more of KUNIT_EXPECT_* calls otherwise you'll > > leak resources. > > > > You also probably want to use a kunit_action to clean up and avoid that > > whole discussion > > > > You are right. I slightly prefer using KUnit expectations (unless actions > are strictly necessary) since I feel using actions makes test cases a bit > less straightforward to understand. Is this okay for you? I disagree. Actions make it easier to reason about, even when comparing assertion vs expectation Like, for the call to sg_alloc_table and drm_gem_shmem_prime_import_sg_table(), the reasonable use of assert vs expect would be something like: sgt = kzalloc(sizeof(*sgt), GFP_KERNEL); KUNIT_ASSERT_NOT_NULL(test, sgt); ret = sg_alloc_table(sgt, 1, GFP_KERNEL); KUNIT_ASSERT_EQ(test, ret, 0); /* * Here, it's already not super clear whether you want to expect vs * assert. expect will make you handle the failure case later, assert will * force you to call kfree on sgt. Both kind of suck in their own ways. */ sg_init_one(sgt->sgl, buf, TEST_SIZE); gem_obj = drm_gem_shmem_prime_import_sg_table(&fdev->drm_dev, &attach_mock, sgt); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, gem_obj); /* * If the assert fails, we forgot to call sg_free_table(sgt) and kfree(sgt). */ KUNIT_EXPECT_EQ(test, gem_obj->size, TEST_SIZE); KUNIT_EXPECT_NULL(test, gem_obj->filp); KUNIT_EXPECT_NOT_NULL(test, gem_obj->funcs); /* * And here we have to handle the case where the expectation was wrong, * but the test still continued. */ But if you're not using an action, you still have to call kfree(sgt), which means that you might still shmem = to_drm_gem_shmem_obj(gem_obj); KUNIT_ASSERT_PTR_EQ(test, shmem->sgt, sgt); /* * If the assertion fails, we now have to call drm_gem_shmem_free(shmem) */ /* The scatter/gather table is freed by drm_gem_shmem_free */ drm_gem_shmem_free(shmem); /* everything's fine now */ The semantics around drm_gem_shmem_free make it a bit convoluted, but doing it using goto/labels, plus handling the assertions and error reporting would be difficult. Using actions, we have: sgt = kzalloc(sizeof(*sgt), GFP_KERNEL); KUNIT_ASSERT_NOT_NULL(test, sgt); ret = kunit_add_action_or_reset(test, kfree_wrapper, sgt); KUNIT_ASSERT_EQ(test, ret, 0); ret = sg_alloc_table(sgt, 1, GFP_KERNEL); KUNIT_ASSERT_EQ(test, ret, 0); ret = kunit_add_action_or_reset(test, sg_free_table_wrapper, sgt); KUNIT_ASSERT_EQ(test, ret, 0); sg_init_one(sgt->sgl, buf, TEST_SIZE); gem_obj = drm_gem_shmem_prime_import_sg_table(&fdev->drm_dev, &attach_mock, sgt); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, gem_obj); KUNIT_EXPECT_EQ(test, gem_obj->size, TEST_SIZE); KUNIT_EXPECT_NULL(test, gem_obj->filp); KUNIT_EXPECT_NOT_NULL(test, gem_obj->funcs); /* drm_gem_shmem_free will free the struct sg_table itself */ kunit_remove_action(test, sg_free_table_wrapper, sgt); kunit_remove_action(test, kfree_wrapper, sgt); shmem = to_drm_gem_shmem_obj(gem_obj); KUNIT_ASSERT_PTR_EQ(test, shmem->sgt, sgt); ret = kunit_add_action_or_reset(test, drm_gem_shmem_free_wrapper, shmem); KUNIT_ASSERT_EQ(test, ret, 0); The last one is arguable, but for the previous ones it makes error handling much more convenient and easy to reason about. The wrappers are also a bit inconvenient to use, but it's mostly there to avoid a compiler warning at the moment. This patch will help hopefully: https://lore.kernel.org/linux-kselftest/20230915050125.3609689-1-davidgow@g… Maxime

2 years, 3 months

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Re: [PATCH] drm: docs: Remove item from TODO list

by Maxime Ripard

Hi, On Mon, Oct 23, 2023 at 10:25:50AM -0700, Doug Anderson wrote: > On Mon, Oct 23, 2023 at 9:31 AM Yuran Pereira <yuran.pereira(a)hotmail.com> wrote: > > > > Since "Clean up checks for already prepared/enabled in panels" has > > already been done and merged [1], I think there is no longer a need > > for this item to be in the gpu TODO. > > > > [1] https://patchwork.freedesktop.org/patch/551421/ > > > > Signed-off-by: Yuran Pereira <yuran.pereira(a)hotmail.com> > > --- > > Documentation/gpu/todo.rst | 25 ------------------------- > > 1 file changed, 25 deletions(-) > > It's not actually all done. It's in a bit of a limbo state right now, > unfortunately. I landed all of the "simple" cases where panels were > needlessly tracking prepare/enable, but the less simple cases are > still outstanding. > > Specifically the issue is that many panels have code to properly power > cycle themselves off at shutdown time and in order to do that they > need to keep track of the prepare/enable state. After a big, long > discussion [1] it was decided that we could get rid of all the panel > code handling shutdown if only all relevant DRM KMS drivers would > properly call drm_atomic_helper_shutdown(). > > I made an attempt to get DRM KMS drivers to call > drm_atomic_helper_shutdown() [2] [3] [4]. I was able to land the > patches that went through drm-misc, but currently many of the > non-drm-misc ones are blocked waiting for attention. > > ...so things that could be done to help out: > > a) Could review patches that haven't landed in [4]. Maybe adding a > Reviewed-by tag would help wake up maintainers? > > b) Could see if you can identify panels that are exclusively used w/ > DRM drivers that have already been converted and then we could post > patches for just those panels. I have no idea how easy this task would > be. Is it enough to look at upstream dts files by "compatible" string? I think it is, yes. Maxime

2 years, 3 months

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Re: [RFC PATCH] drm/test: add a test suite for GEM objects backed by shmem

by Maxime Ripard

Hi Marco, On Mon, Oct 23, 2023 at 06:45:40PM +0200, Marco Pagani wrote: > This patch introduces an initial KUnit test suite for GEM objects > backed by shmem buffers. > > Signed-off-by: Marco Pagani <marpagan(a)redhat.com> > --- > drivers/gpu/drm/Kconfig | 1 + > drivers/gpu/drm/tests/Makefile | 3 +- > drivers/gpu/drm/tests/drm_gem_shmem_test.c | 303 +++++++++++++++++++++ > 3 files changed, 306 insertions(+), 1 deletion(-) > create mode 100644 drivers/gpu/drm/tests/drm_gem_shmem_test.c > > diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig > index 3eee8636f847..f0a77e3e04d7 100644 > --- a/drivers/gpu/drm/Kconfig > +++ b/drivers/gpu/drm/Kconfig > @@ -84,6 +84,7 @@ config DRM_KUNIT_TEST > select DRM_EXPORT_FOR_TESTS if m > select DRM_KUNIT_TEST_HELPERS > select DRM_EXEC > + select DRM_GEM_SHMEM_HELPER I know that DRM_EXEC already stands out, but these should be ordered alphabetically, so it should be before DRM_KUNIT_TEST_HELPERS. > default KUNIT_ALL_TESTS > help > This builds unit tests for DRM. This option is not useful for > diff --git a/drivers/gpu/drm/tests/Makefile b/drivers/gpu/drm/tests/Makefile > index ba7baa622675..b8227aab369e 100644 > --- a/drivers/gpu/drm/tests/Makefile > +++ b/drivers/gpu/drm/tests/Makefile > @@ -18,6 +18,7 @@ obj-$(CONFIG_DRM_KUNIT_TEST) += \ > drm_plane_helper_test.o \ > drm_probe_helper_test.o \ > drm_rect_test.o \ > - drm_exec_test.o > + drm_exec_test.o \ > + drm_gem_shmem_test.o Ditto. > CFLAGS_drm_mm_test.o := $(DISABLE_STRUCTLEAK_PLUGIN) > diff --git a/drivers/gpu/drm/tests/drm_gem_shmem_test.c b/drivers/gpu/drm/tests/drm_gem_shmem_test.c > new file mode 100644 > index 000000000000..0bf6727f08d2 > --- /dev/null > +++ b/drivers/gpu/drm/tests/drm_gem_shmem_test.c > @@ -0,0 +1,303 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * KUnit test suite for GEM objects backed by shmem buffers > + * > + * Copyright (C) 2023 Red Hat, Inc. > + * > + * Author: Marco Pagani <marpagan(a)redhat.com> > + */ > + > +#include <linux/dma-buf.h> > +#include <linux/iosys-map.h> > +#include <linux/sizes.h> > + > +#include <kunit/test.h> > + > +#include <drm/drm_device.h> > +#include <drm/drm_drv.h> > +#include <drm/drm_gem.h> > +#include <drm/drm_gem_shmem_helper.h> > +#include <drm/drm_kunit_helpers.h> > + > +#define TEST_SIZE SZ_1M > +#define TEST_BYTE 0xae > + > +struct fake_dev { > + struct drm_device drm_dev; > + struct device *dev; > +}; > + > +/* Test creating a shmem GEM object */ > +static void drm_gem_shmem_test_obj_create(struct kunit *test) > +{ > + struct fake_dev *fdev = test->priv; > + struct drm_gem_shmem_object *shmem; > + > + shmem = drm_gem_shmem_create(&fdev->drm_dev, TEST_SIZE); > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, shmem); > + KUNIT_ASSERT_EQ(test, shmem->base.size, TEST_SIZE); > + KUNIT_ASSERT_NOT_NULL(test, shmem->base.filp); > + KUNIT_ASSERT_NOT_NULL(test, shmem->base.funcs); > + > + drm_gem_shmem_free(shmem); > +} > + > +/* Test creating a private shmem GEM object from a scatter/gather table */ Thanks for documenting those tests. I believe we should also document what we expect from the test: should the test succeed? fail? if it fails, what is the cause of failure? Based on the following test, I think something like the following would be good: Test that creating a private shmem GEM object from a previously allocated sg_table succeeds and is properly initialized Feel free to change it to something else if you find something missing. > +static void drm_gem_shmem_test_obj_create_private(struct kunit *test) > +{ > + struct fake_dev *fdev = test->priv; > + struct drm_gem_shmem_object *shmem; > + struct drm_gem_object *gem_obj; > + struct dma_buf buf_mock; > + struct dma_buf_attachment attach_mock; > + struct sg_table *sgt; > + char *buf; > + int ret; > + > + /* Create a mock scatter/gather table */ > + buf = kunit_kzalloc(test, TEST_SIZE, GFP_KERNEL); > + KUNIT_ASSERT_NOT_NULL(test, buf); > + > + sgt = kzalloc(sizeof(*sgt), GFP_KERNEL); > + KUNIT_ASSERT_NOT_NULL(test, sgt); > + > + ret = sg_alloc_table(sgt, 1, GFP_KERNEL); > + KUNIT_ASSERT_EQ(test, ret, 0); > + sg_init_one(sgt->sgl, buf, TEST_SIZE); > + > + /* Init a mock DMA-BUF */ > + buf_mock.size = TEST_SIZE; > + attach_mock.dmabuf = &buf_mock; > + > + gem_obj = drm_gem_shmem_prime_import_sg_table(&fdev->drm_dev, &attach_mock, sgt); > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, gem_obj); > + KUNIT_ASSERT_EQ(test, gem_obj->size, TEST_SIZE); > + KUNIT_ASSERT_NULL(test, gem_obj->filp); > + KUNIT_ASSERT_NOT_NULL(test, gem_obj->funcs); > + > + shmem = to_drm_gem_shmem_obj(gem_obj); > + KUNIT_ASSERT_PTR_EQ(test, shmem->sgt, sgt); > + > + /* The scatter/gather table is freed by drm_gem_shmem_free */ > + drm_gem_shmem_free(shmem); > +} KUNIT_ASSERT_* will stop the execution of the test on failure, you should probably use a bit more of KUNIT_EXPECT_* calls otherwise you'll leak resources. You also probably want to use a kunit_action to clean up and avoid that whole discussion > + > +/* Test pinning backing pages */ > +static void drm_gem_shmem_test_pin_pages(struct kunit *test) > +{ > + struct fake_dev *fdev = test->priv; > + struct drm_gem_shmem_object *shmem; > + int i, ret; > + > + shmem = drm_gem_shmem_create(&fdev->drm_dev, TEST_SIZE); > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, shmem); > + KUNIT_ASSERT_NULL(test, shmem->pages); > + KUNIT_ASSERT_EQ(test, shmem->pages_use_count, 0); > + > + ret = drm_gem_shmem_pin(shmem); > + KUNIT_ASSERT_EQ(test, ret, 0); > + KUNIT_ASSERT_NOT_NULL(test, shmem->pages); > + KUNIT_ASSERT_EQ(test, shmem->pages_use_count, 1); > + > + for (i = 0; i < (shmem->base.size >> PAGE_SHIFT); i++) > + KUNIT_ASSERT_NOT_NULL(test, shmem->pages[i]); > + > + drm_gem_shmem_unpin(shmem); > + KUNIT_ASSERT_NULL(test, shmem->pages); > + KUNIT_ASSERT_EQ(test, shmem->pages_use_count, 0); > + > + drm_gem_shmem_free(shmem); > +} > + > +/* Test creating a virtual mapping */ > +static void drm_gem_shmem_test_vmap(struct kunit *test) > +{ > + struct fake_dev *fdev = test->priv; > + struct drm_gem_shmem_object *shmem; > + struct iosys_map map; > + int ret, i; > + > + shmem = drm_gem_shmem_create(&fdev->drm_dev, TEST_SIZE); > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, shmem); > + KUNIT_ASSERT_NULL(test, shmem->vaddr); > + KUNIT_ASSERT_EQ(test, shmem->vmap_use_count, 0); > + > + ret = drm_gem_shmem_vmap(shmem, &map); > + KUNIT_ASSERT_EQ(test, ret, 0); > + KUNIT_ASSERT_NOT_NULL(test, shmem->vaddr); > + KUNIT_ASSERT_EQ(test, shmem->vmap_use_count, 1); > + KUNIT_ASSERT_FALSE(test, iosys_map_is_null(&map)); > + > + iosys_map_memset(&map, 0, TEST_BYTE, TEST_SIZE); > + for (i = 0; i < TEST_SIZE; i++) > + KUNIT_ASSERT_EQ(test, iosys_map_rd(&map, i, u8), TEST_BYTE); > + > + drm_gem_shmem_vunmap(shmem, &map); > + KUNIT_ASSERT_NULL(test, shmem->vaddr); > + KUNIT_ASSERT_EQ(test, shmem->vmap_use_count, 0); > + > + drm_gem_shmem_free(shmem); > +} > + > +/* Test exporting a scatter/gather table */ > +static void drm_gem_shmem_test_get_pages_sgt(struct kunit *test) > +{ > + struct fake_dev *fdev = test->priv; > + struct drm_gem_shmem_object *shmem; > + struct sg_table *sgt; > + struct scatterlist *sg; > + unsigned int si, len = 0; > + int ret; > + > + shmem = drm_gem_shmem_create(&fdev->drm_dev, TEST_SIZE); > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, shmem); > + > + ret = drm_gem_shmem_pin(shmem); > + KUNIT_ASSERT_EQ(test, ret, 0); > + > + sgt = drm_gem_shmem_get_sg_table(shmem); > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, sgt); > + KUNIT_ASSERT_NULL(test, shmem->sgt); > + > + for_each_sgtable_sg(sgt, sg, si) { > + KUNIT_ASSERT_NOT_NULL(test, sg); > + len += sg->length; > + } > + KUNIT_ASSERT_GE(test, len, TEST_SIZE); > + > + kfree(sgt); > + drm_gem_shmem_free(shmem); > +} > + > +/* Test exporting a scatter/gather pinned table for PRIME */ > +static void drm_gem_shmem_test_get_sg_table(struct kunit *test) > +{ > + struct fake_dev *fdev = test->priv; > + struct drm_gem_shmem_object *shmem; > + struct sg_table *sgt; > + struct scatterlist *sg; > + unsigned int si, len = 0; > + > + shmem = drm_gem_shmem_create(&fdev->drm_dev, TEST_SIZE); > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, shmem); > + > + sgt = drm_gem_shmem_get_pages_sgt(shmem); > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, sgt); > + KUNIT_ASSERT_PTR_EQ(test, sgt, shmem->sgt); > + > + for_each_sgtable_sg(sgt, sg, si) { > + KUNIT_ASSERT_NOT_NULL(test, sg); > + len += sg->length; > + } > + KUNIT_ASSERT_GE(test, len, TEST_SIZE); > + > + /* The scatter/gather table is freed by drm_gem_shmem_free */ > + drm_gem_shmem_free(shmem); > +} > + > +/* Test updating madvise status */ > +static void drm_gem_shmem_test_madvise(struct kunit *test) > +{ > + struct fake_dev *fdev = test->priv; > + struct drm_gem_shmem_object *shmem; > + int ret; > + > + shmem = drm_gem_shmem_create(&fdev->drm_dev, TEST_SIZE); > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, shmem); > + KUNIT_ASSERT_EQ(test, shmem->madv, 0); > + > + ret = drm_gem_shmem_madvise(shmem, 1); > + KUNIT_ASSERT_TRUE(test, ret); > + KUNIT_ASSERT_EQ(test, shmem->madv, 1); > + > + ret = drm_gem_shmem_madvise(shmem, -1); > + KUNIT_ASSERT_FALSE(test, ret); > + KUNIT_ASSERT_EQ(test, shmem->madv, -1); > + > + ret = drm_gem_shmem_madvise(shmem, 0); > + KUNIT_ASSERT_FALSE(test, ret); > + KUNIT_ASSERT_EQ(test, shmem->madv, -1); > + > + drm_gem_shmem_free(shmem); > +} > + > +/* Test purging */ > +static void drm_gem_shmem_test_purge(struct kunit *test) > +{ > + struct fake_dev *fdev = test->priv; > + struct drm_gem_shmem_object *shmem; > + struct sg_table *sgt; > + int ret; > + > + shmem = drm_gem_shmem_create(&fdev->drm_dev, TEST_SIZE); > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, shmem); > + > + ret = drm_gem_shmem_is_purgeable(shmem); > + KUNIT_ASSERT_FALSE(test, ret); > + > + ret = drm_gem_shmem_madvise(shmem, 1); > + KUNIT_ASSERT_TRUE(test, ret); > + > + sgt = drm_gem_shmem_get_pages_sgt(shmem); > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, sgt); > + > + ret = drm_gem_shmem_is_purgeable(shmem); > + KUNIT_ASSERT_TRUE(test, ret); > + > + drm_gem_shmem_purge(shmem); > + KUNIT_ASSERT_TRUE(test, ret); > + > + drm_gem_shmem_free(shmem); > +} > + > +static int drm_gem_shmem_test_init(struct kunit *test) > +{ > + struct fake_dev *fdev; > + struct device *dev; > + > + /* Allocate a parent device */ > + dev = drm_kunit_helper_alloc_device(test); > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, dev); > + > + /* > + * The DRM core will automatically initialize the GEM core and create > + * a DRM Memory Manager object which provides an address space pool > + * for GEM objects allocation. > + */ > + fdev = drm_kunit_helper_alloc_drm_device(test, dev, struct fake_dev, > + drm_dev, DRIVER_GEM); > + KUNIT_ASSERT_NOT_ERR_OR_NULL(test, fdev); > + > + fdev->dev = dev; > + test->priv = fdev; > + > + return 0; > +} > + > +static void drm_gem_shmem_test_exit(struct kunit *test) > +{ > + struct fake_dev *fdev = test->priv; > + > + drm_kunit_helper_free_device(test, fdev->dev); > +} You don't need to call drm_kunit_helper_free_device() anymore Maxime

2 years, 3 months

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[PATCH v2 00/11] Add mediate-drm secure flow for SVP

by Jason-JH.Lin

The patch series provides drm driver support for enabling secure video path (SVP) playback on MediaiTek hardware in the Linux kernel. Memory Definitions: secure memory - Memory allocated in the TEE (Trusted Execution Environment) which is inaccessible in the REE (Rich Execution Environment, i.e. linux kernel/userspace). secure handle - Integer value which acts as reference to 'secure memory'. Used in communication between TEE and REE to reference 'secure memory'. secure buffer - 'secure memory' that is used to store decrypted, compressed video or for other general purposes in the TEE. secure surface - 'secure memory' that is used to store graphic buffers. Memory Usage in SVP: The overall flow of SVP starts with encrypted video coming in from an outside source into the REE. The REE will then allocate a 'secure buffer' and send the corresponding 'secure handle' along with the encrypted, compressed video data to the TEE. The TEE will then decrypt the video and store the result in the 'secure buffer'. The REE will then allocate a 'secure surface'. The REE will pass the 'secure handles' for both the 'secure buffer' and 'secure surface' into the TEE for video decoding. The video decoder HW will then decode the contents of the 'secure buffer' and place the result in the 'secure surface'. The REE will then attach the 'secure surface' to the overlay plane for rendering of the video. Everything relating to ensuring security of the actual contents of the 'secure buffer' and 'secure surface' is out of scope for the REE and is the responsibility of the TEE. DRM driver handles allocation of gem objects that are backed by a 'secure surface' and for displaying a 'secure surface' on the overlay plane. This introduces a new flag for object creation called DRM_MTK_GEM_CREATE_ENCRYPTED which indicates it should be a 'secure surface'. All changes here are in MediaTek specific code. --- Based on 3 series and 1 patch: [1] dma-buf: heaps: Add MediaTek secure heap - https://patchwork.kernel.org/project/linux-mediatek/list/?series=782776 [2] add driver to support secure video decoder - https://patchwork.kernel.org/project/linux-mediatek/list/?series=782922 [3] soc: mediatek: Add register definitions for GCE - https://patchwork.kernel.org/project/linux-mediatek/patch/20231017064717.21… [4] Add CMDQ secure driver for SVP - https://patchwork.kernel.org/project/linux-mediatek/list/?series=795502 --- Change in v2: 1. remove the DRIVER_RDNDER flag for mtk_drm_ioctl 2. move cmdq_insert_backup_cookie into client driver 3. move secure gce node define from mt8195-cherry.dtsi to mt8195.dtsi --- CK Hu (1): drm/mediatek: Add interface to allocate MediaTek GEM buffer. Jason-JH.Lin (10): drm/mediatek/uapi: Add DRM_MTK_GEM_CREATED_ENCRYPTTED flag drm/mediatek: Add secure buffer control flow to mtk_drm_gem drm/mediatek: Add secure identify flag and funcution to mtk_drm_plane drm/mediatek: Add mtk_ddp_sec_write to config secure buffer info drm/mediatek: Add get_sec_port interface to mtk_ddp_comp drm/mediatek: Add secure layer config support for ovl drm/mediatek: Add secure layer config support for ovl_adaptor drm/mediatek: Add secure flow support to mediatek-drm drm/mediatek: Add cmdq_insert_backup_cookie before secure pkt finalize arm64: dts: mt8195: Add secure mbox settings for vdosys arch/arm64/boot/dts/mediatek/mt8195.dtsi | 6 +- drivers/gpu/drm/mediatek/mtk_disp_drv.h | 3 + drivers/gpu/drm/mediatek/mtk_disp_ovl.c | 31 +- .../gpu/drm/mediatek/mtk_disp_ovl_adaptor.c | 15 + drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 274 +++++++++++++++++- drivers/gpu/drm/mediatek/mtk_drm_crtc.h | 1 + drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 14 + drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h | 13 + drivers/gpu/drm/mediatek/mtk_drm_drv.c | 13 + drivers/gpu/drm/mediatek/mtk_drm_gem.c | 121 ++++++++ drivers/gpu/drm/mediatek/mtk_drm_gem.h | 16 + drivers/gpu/drm/mediatek/mtk_drm_plane.c | 7 + drivers/gpu/drm/mediatek/mtk_drm_plane.h | 2 + drivers/gpu/drm/mediatek/mtk_mdp_rdma.c | 11 +- drivers/gpu/drm/mediatek/mtk_mdp_rdma.h | 2 + include/uapi/drm/mediatek_drm.h | 59 ++++ 16 files changed, 570 insertions(+), 18 deletions(-) create mode 100644 include/uapi/drm/mediatek_drm.h -- 2.18.0

2 years, 3 months

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Re: [PATCH] drm/amdgpu: Fix a null pointer access when the smc_rreg pointer is NULL

by Alex Deucher

Applied. Thanks! Alex On Mon, Oct 23, 2023 at 9:06 AM <qu.huang(a)linux.dev> wrote: > > In certain types of chips, such as VEGA20, reading the amdgpu_regs_smc file could result in an abnormal null pointer access when the smc_rreg pointer is NULL. Below are the steps to reproduce this issue and the corresponding exception log: > > 1. Navigate to the directory: /sys/kernel/debug/dri/0 > 2. Execute command: cat amdgpu_regs_smc > 3. Exception Log:: > [4005007.702554] BUG: kernel NULL pointer dereference, address: 0000000000000000 > [4005007.702562] #PF: supervisor instruction fetch in kernel mode > [4005007.702567] #PF: error_code(0x0010) - not-present page > [4005007.702570] PGD 0 P4D 0 > [4005007.702576] Oops: 0010 [#1] SMP NOPTI > [4005007.702581] CPU: 4 PID: 62563 Comm: cat Tainted: G OE 5.15.0-43-generic #46-Ubunt u > [4005007.702590] RIP: 0010:0x0 > [4005007.702598] Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6. > [4005007.702600] RSP: 0018:ffffa82b46d27da0 EFLAGS: 00010206 > [4005007.702605] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffa82b46d27e68 > [4005007.702609] RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff9940656e0000 > [4005007.702612] RBP: ffffa82b46d27dd8 R08: 0000000000000000 R09: ffff994060c07980 > [4005007.702615] R10: 0000000000020000 R11: 0000000000000000 R12: 00007f5e06753000 > [4005007.702618] R13: ffff9940656e0000 R14: ffffa82b46d27e68 R15: 00007f5e06753000 > [4005007.702622] FS: 00007f5e0755b740(0000) GS:ffff99479d300000(0000) knlGS:0000000000000000 > [4005007.702626] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [4005007.702629] CR2: ffffffffffffffd6 CR3: 00000003253fc000 CR4: 00000000003506e0 > [4005007.702633] Call Trace: > [4005007.702636] <TASK> > [4005007.702640] amdgpu_debugfs_regs_smc_read+0xb0/0x120 [amdgpu] > [4005007.703002] full_proxy_read+0x5c/0x80 > [4005007.703011] vfs_read+0x9f/0x1a0 > [4005007.703019] ksys_read+0x67/0xe0 > [4005007.703023] __x64_sys_read+0x19/0x20 > [4005007.703028] do_syscall_64+0x5c/0xc0 > [4005007.703034] ? do_user_addr_fault+0x1e3/0x670 > [4005007.703040] ? exit_to_user_mode_prepare+0x37/0xb0 > [4005007.703047] ? irqentry_exit_to_user_mode+0x9/0x20 > [4005007.703052] ? irqentry_exit+0x19/0x30 > [4005007.703057] ? exc_page_fault+0x89/0x160 > [4005007.703062] ? asm_exc_page_fault+0x8/0x30 > [4005007.703068] entry_SYSCALL_64_after_hwframe+0x44/0xae > [4005007.703075] RIP: 0033:0x7f5e07672992 > [4005007.703079] Code: c0 e9 b2 fe ff ff 50 48 8d 3d fa b2 0c 00 e8 c5 1d 02 00 0f 1f 44 00 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 0f 05 <48> 3d 00 f0 ff ff 77 56 c3 0f 1f 44 00 00 48 83 e c 28 48 89 54 24 > [4005007.703083] RSP: 002b:00007ffe03097898 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 > [4005007.703088] RAX: ffffffffffffffda RBX: 0000000000020000 RCX: 00007f5e07672992 > [4005007.703091] RDX: 0000000000020000 RSI: 00007f5e06753000 RDI: 0000000000000003 > [4005007.703094] RBP: 00007f5e06753000 R08: 00007f5e06752010 R09: 00007f5e06752010 > [4005007.703096] R10: 0000000000000022 R11: 0000000000000246 R12: 0000000000022000 > [4005007.703099] R13: 0000000000000003 R14: 0000000000020000 R15: 0000000000020000 > [4005007.703105] </TASK> > [4005007.703107] Modules linked in: nf_tables libcrc32c nfnetlink algif_hash af_alg binfmt_misc nls_ iso8859_1 ipmi_ssif ast intel_rapl_msr intel_rapl_common drm_vram_helper drm_ttm_helper amd64_edac t tm edac_mce_amd kvm_amd ccp mac_hid k10temp kvm acpi_ipmi ipmi_si rapl sch_fq_codel ipmi_devintf ipm i_msghandler msr parport_pc ppdev lp parport mtd pstore_blk efi_pstore ramoops pstore_zone reed_solo mon ip_tables x_tables autofs4 ib_uverbs ib_core amdgpu(OE) amddrm_ttm_helper(OE) amdttm(OE) iommu_v 2 amd_sched(OE) amdkcl(OE) drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops cec rc_core drm igb ahci xhci_pci libahci i2c_piix4 i2c_algo_bit xhci_pci_renesas dca > [4005007.703184] CR2: 0000000000000000 > [4005007.703188] ---[ end trace ac65a538d240da39 ]--- > [4005007.800865] RIP: 0010:0x0 > [4005007.800871] Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6. > [4005007.800874] RSP: 0018:ffffa82b46d27da0 EFLAGS: 00010206 > [4005007.800878] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffa82b46d27e68 > [4005007.800881] RDX: 0000000000000001 RSI: 0000000000000000 RDI: ffff9940656e0000 > [4005007.800883] RBP: ffffa82b46d27dd8 R08: 0000000000000000 R09: ffff994060c07980 > [4005007.800886] R10: 0000000000020000 R11: 0000000000000000 R12: 00007f5e06753000 > [4005007.800888] R13: ffff9940656e0000 R14: ffffa82b46d27e68 R15: 00007f5e06753000 > [4005007.800891] FS: 00007f5e0755b740(0000) GS:ffff99479d300000(0000) knlGS:0000000000000000 > [4005007.800895] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [4005007.800898] CR2: ffffffffffffffd6 CR3: 00000003253fc000 CR4: 00000000003506e0 > > Signed-off-by: Qu Huang <qu.huang(a)linux.dev> > --- > drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c > index a4faea4..05405da 100644 > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c > @@ -748,6 +748,9 @@ static ssize_t amdgpu_debugfs_regs_smc_read(struct file *f, char __user *buf, > ssize_t result = 0; > int r; > > + if (!adev->smc_rreg) > + return -EPERM; > + > if (size & 0x3 || *pos & 0x3) > return -EINVAL; > > @@ -804,6 +807,9 @@ static ssize_t amdgpu_debugfs_regs_smc_write(struct file *f, const char __user * > ssize_t result = 0; > int r; > > + if (!adev->smc_wreg) > + return -EPERM; > + > if (size & 0x3 || *pos & 0x3) > return -EINVAL; > > -- > 1.8.3.1

2 years, 3 months

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[syzbot] [dri?] WARNING in drm_prime_fd_to_handle_ioctl

by syzbot

Hello, syzbot found the following issue on: HEAD commit: 1c8b86a3799f Merge tag 'xsa441-6.6-tag' of git://git.kerne.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=13005e31680000 kernel config: https://syzkaller.appspot.com/x/.config?x=32d0b9b42ceb8b10 dashboard link: https://syzkaller.appspot.com/bug?extid=0da81ccba2345eeb7f48 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13c48345680000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=101b3679680000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/45e9377886e9/disk-1c8b86a3.raw… vmlinux: https://storage.googleapis.com/syzbot-assets/9511a41a6d1e/vmlinux-1c8b86a3.… kernel image: https://storage.googleapis.com/syzbot-assets/fac07e1c3c1a/bzImage-1c8b86a3.… The issue was bisected to: commit 85e26dd5100a182bf8448050427539c0a66ab793 Author: Christian König <christian.koenig(a)amd.com> Date: Thu Jan 26 09:24:26 2023 +0000 drm/client: fix circular reference counting issue bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=14cf17f1680000 final oops: https://syzkaller.appspot.com/x/report.txt?x=16cf17f1680000 console output: https://syzkaller.appspot.com/x/log.txt?x=12cf17f1680000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+0da81ccba2345eeb7f48(a)syzkaller.appspotmail.com Fixes: 85e26dd5100a ("drm/client: fix circular reference counting issue") ------------[ cut here ]------------ WARNING: CPU: 0 PID: 5040 at drivers/gpu/drm/drm_prime.c:326 drm_gem_prime_fd_to_handle drivers/gpu/drm/drm_prime.c:326 [inline] WARNING: CPU: 0 PID: 5040 at drivers/gpu/drm/drm_prime.c:326 drm_prime_fd_to_handle_ioctl+0x555/0x600 drivers/gpu/drm/drm_prime.c:374 Modules linked in: CPU: 0 PID: 5040 Comm: syz-executor405 Not tainted 6.6.0-rc5-syzkaller-00055-g1c8b86a3799f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023 RIP: 0010:drm_gem_prime_fd_to_handle drivers/gpu/drm/drm_prime.c:326 [inline] RIP: 0010:drm_prime_fd_to_handle_ioctl+0x555/0x600 drivers/gpu/drm/drm_prime.c:374 Code: 89 df e8 0e 9b 26 fd f0 48 ff 03 e9 7e fd ff ff e8 b0 dc d0 fc 4c 89 f7 44 89 eb e8 75 73 8b 05 e9 da fe ff ff e8 9b dc d0 fc <0f> 0b e9 5d fd ff ff e8 3f 94 26 fd e9 3a fc ff ff 48 8b 7c 24 08 RSP: 0018:ffffc90003a5fc70 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff888018f14c00 RCX: 0000000000000000 RDX: ffff88801d691dc0 RSI: ffffffff84b6ea15 RDI: ffff8881476f3928 RBP: ffff88801fac5400 R08: 0000000000000007 R09: fffffffffffff000 R10: ffff8881476f3800 R11: 0000000000000000 R12: ffffc90003a5fe10 R13: ffff8881476f3800 R14: ffff88801c590c10 R15: 0000000000000000 FS: 00005555555d6380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555db75f4058 CR3: 0000000072209000 CR4: 0000000000350ef0 Call Trace: <TASK> drm_ioctl_kernel+0x280/0x4c0 drivers/gpu/drm/drm_ioctl.c:789 drm_ioctl+0x5cb/0xbf0 drivers/gpu/drm/drm_ioctl.c:892 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl fs/ioctl.c:857 [inline] __x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f0c8214be69 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff6f4156f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f0c8214be69 RDX: 0000000020000000 RSI: 00000000c00c642e RDI: 0000000000000003 RBP: 0000000000000000 R08: 00000000000000a0 R09: 00000000000000a0 R10: 00000000000000a0 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f0c821c3820 R14: 00007fff6f415720 R15: 00007fff6f415710 </TASK> --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller(a)googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection If the bug is already fixed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup

2 years, 4 months

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[PATCH][next] dma-buf: Fix NULL pointer dereference in dma_fence_enable_sw_signaling()

by Gustavo A. R. Silva

Currently, a NULL pointer dereference will happen in function `dma_fence_enable_sw_signaling()` (at line 615), in case `chain` is not allocated in `mock_chain()` and this function returns `NULL` (at line 86). See below: drivers/dma-buf/st-dma-fence-chain.c: 86 chain = mock_chain(NULL, f, 1); 87 if (!chain) 88 err = -ENOMEM; 89 90 dma_fence_enable_sw_signaling(chain); drivers/dma-buf/dma-fence.c: 611 void dma_fence_enable_sw_signaling(struct dma_fence *fence) 612 { 613 unsigned long flags; 614 615 spin_lock_irqsave(fence->lock, flags); ^^^^^^^^^^^ | NULL pointer reference if fence == NULL 616 __dma_fence_enable_signaling(fence); 617 spin_unlock_irqrestore(fence->lock, flags); 618 } Fix this by adding a NULL check before dereferencing `fence` in `dma_fence_enable_sw_signaling()`. This will prevent any other NULL pointer dereference when the `fence` passed as an argument is `NULL`. Addresses-Coverity: ("Dereference after null check") Fixes: d62c43a953ce ("dma-buf: Enable signaling on fence for selftests") Cc: stable(a)vger.kernel.org Signed-off-by: Gustavo A. R. Silva <gustavoars(a)kernel.org> --- drivers/dma-buf/dma-fence.c | 9 ++++++++- include/linux/dma-fence.h | 2 +- 2 files changed, 9 insertions(+), 2 deletions(-) diff --git a/drivers/dma-buf/dma-fence.c b/drivers/dma-buf/dma-fence.c index 8aa8f8cb7071..4d2f13560d0f 100644 --- a/drivers/dma-buf/dma-fence.c +++ b/drivers/dma-buf/dma-fence.c @@ -607,14 +607,21 @@ static bool __dma_fence_enable_signaling(struct dma_fence *fence) * This will request for sw signaling to be enabled, to make the fence * complete as soon as possible. This calls &dma_fence_ops.enable_signaling * internally. + * + * Returns 0 on success and a negative error value when @fence is NULL. */ -void dma_fence_enable_sw_signaling(struct dma_fence *fence) +int dma_fence_enable_sw_signaling(struct dma_fence *fence) { unsigned long flags; + if (!fence) + return -EINVAL; + spin_lock_irqsave(fence->lock, flags); __dma_fence_enable_signaling(fence); spin_unlock_irqrestore(fence->lock, flags); + + return 0; } EXPORT_SYMBOL(dma_fence_enable_sw_signaling); diff --git a/include/linux/dma-fence.h b/include/linux/dma-fence.h index ebe78bd3d121..1e4025e925e6 100644 --- a/include/linux/dma-fence.h +++ b/include/linux/dma-fence.h @@ -399,7 +399,7 @@ int dma_fence_add_callback(struct dma_fence *fence, dma_fence_func_t func); bool dma_fence_remove_callback(struct dma_fence *fence, struct dma_fence_cb *cb); -void dma_fence_enable_sw_signaling(struct dma_fence *fence); +int dma_fence_enable_sw_signaling(struct dma_fence *fence); /** * dma_fence_is_signaled_locked - Return an indication if the fence -- 2.34.1

2 years, 4 months

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Linaro-mm-sig