Hell all, +jerome f. On Fri, 3 Feb 2023 at 12:01, Olivier Masse <olivier.masse@xxxxxxx> wrote: > > On jeu., 2023-02-02 at 10:58 +0100, Etienne Carriere wrote: > > Caution: EXT Email > > > > On Thu, 2 Feb 2023 at 09:35, Sumit Garg <sumit.garg@xxxxxxxxxx> > > wrote: > > > Hi Cyrille, > > > > > > Please don't top post as it makes it harder to follow-up. > > > > > > On Thu, 2 Feb 2023 at 13:26, Cyrille Fleury <cyrille.fleury@xxxxxxx > > > > wrote: > > > > Hi Sumit, all > > > > > > > > Upstream OP-TEE should support registering a dmabuf since a > > > > while, given how widely dmabuf is used in Linux for passing > > > > buffers around between devices. > > > > > > > > Purpose of the new register_tee_shm ioctl is to allow OPTEE to > > > > use memory allocated from the exiting linux dma buffer. We don't > > > > need to have secure dma-heap up streamed. > > > > > > > > You mentioned secure dma-buffer, but secure dma-buffer is a dma- > > > > buffer, so the work to be done for secure or "regular" dma > > > > buffers by the register_tee_shm ioctl is 100% the same. > > > > > > > > The scope of this ioctl is limited to what existing upstream dma- > > > > buffers are: > > > > -> sharing buffers for hardware (DMA) access across > > > > multiple device drivers and subsystems, and for synchronizing > > > > asynchronous hardware access. > > > > -> It means continuous memory only. > > > > > > > > So if we reduce the scope of register tee_shm to exiting dma- > > > > buffer area, the current patch does the job. > > > > > > Do you have a corresponding real world use-case supported by > > > upstream > > > OP-TEE? AFAIK, the Secure Data Path (SDP) use-case is the one > > > supported in OP-TEE upstream but without secure dmabuf heap [1] > > > available, the new ioctl can't be exercised. > > > > > > [1] https://github.com/OP-TEE/optee_test/blob/master/host/xtest/sdp_basic.h#L15 > > > > OP-TEE has some SDP test taht can exercice SDP: 'xtest > > regression_1014'. > > https://github.com/OP-TEE/optee_test/blob/3.20.0/host/xtest/regression_1000.c#L1256 > > > > The test relies on old staged ION + local secure dmabuf heaps no more > > maintained, so this test is currently not functional. > > If we upgrade the test to mainline dmabuf alloc means, and apply the > > change discussed here, we should be able to regularly test SDP in > > OP-TEE project CI. > > The part to update is the userland allocation of the dmabuf: > > https://github.com/OP-TEE/optee_test/blob/3.20.0/host/xtest/sdp_basic.c#L91 > > > > > > the test was already updated to support secure dma heap with Kernel > version 5.11 and higher. the userland allocation could be find here: > https://github.com/OP-TEE/optee_test/blob/3.20.0/host/xtest/sdp_basic.c#L153 > Oh, right. So fine, optee_test is ready for the new flavor of secure buffer fd's. > This upgrade need a Linux dma-buf patch: > https://lore.kernel.org/all/20220805154139.2qkqxwklufjpsfdx@000377403353/T/ @Jens, @Jerome, do we want to pick the 2 necessary Linux patches in our Linux kernel fork (github.com/linaro-swg/linux.git) to exercise SDP in our CI and be ready if dma-buf secure heaps (ref right above) is accepted and merged in mainline kernel?. Br, etienne > > > > br, > > etienne > > > > > > > -Sumit > > > > > > > Regards. > > > > > > > > -----Original Message----- > > > > From: Sumit Garg <sumit.garg@xxxxxxxxxx> > > > > Sent: Wednesday, February 1, 2023 6:34 AM > > > > To: Olivier Masse <olivier.masse@xxxxxxx> > > > > Cc: fredgc@xxxxxxxxxx; linux-media@xxxxxxxxxxxxxxx; > > > > linaro-mm-sig@xxxxxxxxxxxxxxxx; afd@xxxxxx; > > > > op-tee@xxxxxxxxxxxxxxxxxxxxxxxxx; jens.wiklander@xxxxxxxxxx; > > > > joakim.bech@xxxxxxxxxx; sumit.semwal@xxxxxxxxxx; Peter Griffin < > > > > peter.griffin@xxxxxxxxxx>; linux-kernel@xxxxxxxxxxxxxxx; > > > > etienne.carriere@xxxxxxxxxx; dri-devel@xxxxxxxxxxxxxxxxxxxxx; > > > > christian.koenig@xxxxxxx; Clément Faure <clement.faure@xxxxxxx>; > > > > Cyrille Fleury <cyrille.fleury@xxxxxxx> > > > > Subject: [EXT] Re: [PATCH v2 1/1] tee: new ioctl to a register > > > > tee_shm from a dmabuf file descriptor > > > > > > > > Caution: EXT Email > > > > > > > > Hi Olivier, > > > > > > > > On Fri, 27 Jan 2023 at 16:24, Olivier Masse < > > > > olivier.masse@xxxxxxx> wrote: > > > > > Hi Joakim, > > > > > Hi Etienne, > > > > > > > > > > Let me bring back this pull request for OPTEE Linux driver. > > > > > > > > > > Last feedback was from Christian König and Sumit Garg. > > > > > From Christian: > > > > > > Just two comments: > > > > > > > > > > > > 1. Dmitry is working on a change which renames some functions > > > > > > and > > > > > > makes it mandatory to call them with the dma_resv lock held. > > > > > > > > > > > > Depending on how you want to upstream this change you will > > > > > > certainly > > > > > > run into conflicts with that. > > > > > > > > > > Is there any update on these changes ? > > > > > > > > > > > 2. Would it be possible to do this dynamically? In other > > > > > > words does > > > > > > the tee driver has a concept of buffers moving around? > > > > > > > > > > We do not support dynamic secure memory heap. > > > > > > > > > > From Sumit: > > > > > > What limits you to extend this feature to non-contiguous > > > > > > memory > > > > > > buffers? I believe that should be possible with OP-TEE > > > > > > dynamic > > > > > > shared memory which gives you the granularity to register a > > > > > > list of pages. > > > > > > > > > > Our solution use a fixed protected reserved memory region and > > > > > do not > > > > > rely on a dynamic protection managed in secure. > > > > > > > > > > The scope of this implementation rely on a static memory region > > > > > handled by a specific DMA Heap type. > > > > > > > > > > > > > AFAIR, the last review for v2 is here [1]. So we need to have > > > > this secure DMA heap upstream in order for ioctl added by this > > > > patch to be usable. > > > > > > > > [1] > > > > https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.trustedfirmware.org%2Farchives%2Flist%2Fop-tee%40lists.trustedfirmware.org%2Fmessage%2FM3WLO7RNG22OR4744BY6XNG2GLIYMNHN%2F&data=05%7C01%7Colivier.masse%40nxp.com%7Ca27f690d9d7244c2bcff08db05040f11%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C638109287211847995%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=3ur7F71QnW6r15GdYR2e2YyoZLTONtTQvLHigH3uJsk%3D&reserved=0 > > > > > > > > -Sumit > > > > > > > > > Best regards, > > > > > Olivier MASSE > > > > > > > > > > > > > > > On ven., 2022-08-12 at 16:30 +0200, Olivier Masse wrote: > > > > > > From: Etienne Carriere <etienne.carriere@xxxxxxxxxx> > > > > > > > > > > > > This change allows userland to create a tee_shm object that > > > > > > refers > > > > > > to a dmabuf reference. > > > > > > > > > > > > Userland provides a dmabuf file descriptor as buffer > > > > > > reference. > > > > > > The created tee_shm object exported as a brand new dmabuf > > > > > > reference > > > > > > used to provide a clean fd to userland. Userland shall closed > > > > > > this > > > > > > new fd to release the tee_shm object resources. The initial > > > > > > dmabuf > > > > > > resources are tracked independently through original dmabuf > > > > > > file > > > > > > descriptor. > > > > > > > > > > > > Once the buffer is registered and until it is released, TEE > > > > > > driver > > > > > > keeps a refcount on the registered dmabuf structure. > > > > > > > > > > > > This change only support dmabuf references that relates to > > > > > > physically contiguous memory buffers. > > > > > > > > > > > > New tee_shm flag to identify tee_shm objects built from a > > > > > > registered > > > > > > dmabuf: TEE_SHM_EXT_DMA_BUF. Such tee_shm structures are > > > > > > flagged > > > > > > with TEE_SHM_EXT_DMA_BUF. > > > > > > > > > > > > Co-Developed-by: Etienne Carriere < > > > > > > etienne.carriere@xxxxxxxxxx> > > > > > > Signed-off-by: Olivier Masse <olivier.masse@xxxxxxx> > > > > > > Reported-by: kernel test robot <lkp@xxxxxxxxx> > > > > > > From: > > > > > > https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgi%2F&data=05%7C01%7Colivier.masse%40nxp.com%7Ca27f690d9d7244c2bcff08db05040f11%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C638109287211847995%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=7LNWTr4TWQoB0OLqasXT05o%2BUkodxsOqpcUcvoeiZ74%3D&reserved=0 > > > > > > thub.com%2Flinaro- > > > > > > swg%2Flinux.git&data=05%7C01%7Ccyrille.fleury%40nx > > > > > > p.com%7Cb24461a4e7284314dff408db0415f23e%7C686ea1d3bc2b4c6fa9 > > > > > > 2cd99c5 > > > > > > c301635%7C0%7C0%7C638108264533221384%7CUnknown%7CTWFpbGZsb3d8 > > > > > > eyJWIjo > > > > > > iMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7 > > > > > > C3000%7 > > > > > > C%7C%7C&sdata=8jbFPaF%2B5JBed4Uvo1hsJiB%2BP71KUgJmnW%2BIi3zLf > > > > > > ok%3D&r > > > > > > eserved=0 (cherry picked from commit > > > > > > 41e21e5c405530590dc2dd10b2a8dbe64589840f) > > > > > > --- > > > > > > drivers/tee/tee_core.c | 38 +++++++++++++++ > > > > > > drivers/tee/tee_shm.c | 99 > > > > > > +++++++++++++++++++++++++++++++++++++++- > > > > > > include/linux/tee_drv.h | 11 > > > > > > +++++ include/uapi/linux/tee.h | 29 > > > > > > ++++++++++++ > > > > > > 4 files changed, 175 insertions(+), 2 deletions(-) > > > > > > > > > > > > diff --git a/drivers/tee/tee_core.c b/drivers/tee/tee_core.c > > > > > > index > > > > > > 8aa1a4836b92..7c45cbf85eb9 100644 > > > > > > --- a/drivers/tee/tee_core.c > > > > > > +++ b/drivers/tee/tee_core.c > > > > > > @@ -355,6 +355,42 @@ tee_ioctl_shm_register(struct > > > > > > tee_context *ctx, > > > > > > return ret; > > > > > > } > > > > > > > > > > > > +static int tee_ioctl_shm_register_fd(struct tee_context > > > > > > *ctx, > > > > > > + struct > > > > > > tee_ioctl_shm_register_fd_data __user *udata) > > > > > > +{ > > > > > > + struct tee_ioctl_shm_register_fd_data data; > > > > > > + struct tee_shm *shm; > > > > > > + long ret; > > > > > > + > > > > > > + if (copy_from_user(&data, udata, sizeof(data))) > > > > > > + return -EFAULT; > > > > > > + > > > > > > + /* Currently no input flags are supported */ > > > > > > + if (data.flags) > > > > > > + return -EINVAL; > > > > > > + > > > > > > + shm = tee_shm_register_fd(ctx, data.fd); > > > > > > + if (IS_ERR(shm)) > > > > > > + return -EINVAL; > > > > > > + > > > > > > + data.id = shm->id; > > > > > > + data.flags = shm->flags; > > > > > > + data.size = shm->size; > > > > > > + > > > > > > + if (copy_to_user(udata, &data, sizeof(data))) > > > > > > + ret = -EFAULT; > > > > > > + else > > > > > > + ret = tee_shm_get_fd(shm); > > > > > > + > > > > > > + /* > > > > > > + * When user space closes the file descriptor the > > > > > > shared memory > > > > > > + * should be freed or if tee_shm_get_fd() failed then > > > > > > it will > > > > > > + * be freed immediately. > > > > > > + */ > > > > > > + tee_shm_put(shm); > > > > > > + return ret; > > > > > > +} > > > > > > + > > > > > > static int params_from_user(struct tee_context *ctx, struct > > > > > > tee_param *params, > > > > > > size_t num_params, > > > > > > struct tee_ioctl_param __user > > > > > > *uparams) @@ > > > > > > -829,6 +865,8 @@ static long tee_ioctl(struct file *filp, > > > > > > unsigned > > > > > > int cmd, unsigned long arg) > > > > > > return tee_ioctl_shm_alloc(ctx, uarg); > > > > > > case TEE_IOC_SHM_REGISTER: > > > > > > return tee_ioctl_shm_register(ctx, uarg); > > > > > > + case TEE_IOC_SHM_REGISTER_FD: > > > > > > + return tee_ioctl_shm_register_fd(ctx, uarg); > > > > > > case TEE_IOC_OPEN_SESSION: > > > > > > return tee_ioctl_open_session(ctx, uarg); > > > > > > case TEE_IOC_INVOKE: > > > > > > diff --git a/drivers/tee/tee_shm.c b/drivers/tee/tee_shm.c > > > > > > index > > > > > > 836872467dc6..55a3fbbb022e 100644 > > > > > > --- a/drivers/tee/tee_shm.c > > > > > > +++ b/drivers/tee/tee_shm.c > > > > > > @@ -4,6 +4,7 @@ > > > > > > */ > > > > > > #include <linux/anon_inodes.h> > > > > > > #include <linux/device.h> > > > > > > +#include <linux/dma-buf.h> > > > > > > #include <linux/idr.h> > > > > > > #include <linux/mm.h> > > > > > > #include <linux/sched.h> > > > > > > @@ -12,6 +13,14 @@ > > > > > > #include <linux/uio.h> > > > > > > #include "tee_private.h" > > > > > > > > > > > > +/* extra references appended to shm object for registered > > > > > > shared > > > > > > memory */ > > > > > > +struct tee_shm_dmabuf_ref { > > > > > > + struct tee_shm shm; > > > > > > + struct dma_buf *dmabuf; > > > > > > + struct dma_buf_attachment *attach; > > > > > > + struct sg_table *sgt; > > > > > > +}; > > > > > > + > > > > > > static void shm_put_kernel_pages(struct page **pages, size_t > > > > > > page_count) > > > > > > { > > > > > > size_t n; > > > > > > @@ -71,7 +80,16 @@ static void > > > > > > release_registered_pages(struct > > > > > > tee_shm *shm) > > > > > > > > > > > > static void tee_shm_release(struct tee_device *teedev, > > > > > > struct > > > > > > tee_shm *shm) { > > > > > > - if (shm->flags & TEE_SHM_POOL) { > > > > > > + if (shm->flags & TEE_SHM_EXT_DMA_BUF) { > > > > > > + struct tee_shm_dmabuf_ref *ref; > > > > > > + > > > > > > + ref = container_of(shm, struct > > > > > > tee_shm_dmabuf_ref, > > > > > > shm); > > > > > > + dma_buf_unmap_attachment(ref->attach, ref->sgt, > > > > > > + DMA_BIDIRECTIONAL); > > > > > > + > > > > > > + dma_buf_detach(ref->dmabuf, ref->attach); > > > > > > + dma_buf_put(ref->dmabuf); > > > > > > + } else if (shm->flags & TEE_SHM_POOL) { > > > > > > teedev->pool->ops->free(teedev->pool, shm); > > > > > > } else if (shm->flags & TEE_SHM_DYNAMIC) { > > > > > > int rc = teedev->desc->ops->shm_unregister(shm- > > > > > > >ctx, > > > > > > shm); > > > > > > @@ -195,7 +213,7 @@ struct tee_shm > > > > > > *tee_shm_alloc_user_buf(struct > > > > > > tee_context *ctx, size_t size) > > > > > > * tee_client_invoke_func(). The memory allocated is later > > > > > > freed > > > > > > with a > > > > > > * call to tee_shm_free(). > > > > > > * > > > > > > - * @returns a pointer to 'struct tee_shm' > > > > > > + * @returns a pointer to 'struct tee_shm' on success, and > > > > > > ERR_PTR > > > > > > + on > > > > > > failure > > > > > > */ > > > > > > struct tee_shm *tee_shm_alloc_kernel_buf(struct tee_context > > > > > > *ctx, > > > > > > size_t size) { @@ -229,6 +247,83 @@ struct tee_shm > > > > > > *tee_shm_alloc_priv_buf(struct tee_context *ctx, size_t > > > > > > size) } > > > > > > EXPORT_SYMBOL_GPL(tee_shm_alloc_priv_buf); > > > > > > > > > > > > +struct tee_shm *tee_shm_register_fd(struct tee_context *ctx, > > > > > > int > > > > > > +fd) { > > > > > > + struct tee_shm_dmabuf_ref *ref; > > > > > > + int rc; > > > > > > + > > > > > > + if (!tee_device_get(ctx->teedev)) > > > > > > + return ERR_PTR(-EINVAL); > > > > > > + > > > > > > + teedev_ctx_get(ctx); > > > > > > + > > > > > > + ref = kzalloc(sizeof(*ref), GFP_KERNEL); > > > > > > + if (!ref) { > > > > > > + rc = -ENOMEM; > > > > > > + goto err_put_tee; > > > > > > + } > > > > > > + > > > > > > + refcount_set(&ref->shm.refcount, 1); > > > > > > + ref->shm.ctx = ctx; > > > > > > + ref->shm.id = -1; > > > > > > + > > > > > > + ref->dmabuf = dma_buf_get(fd); > > > > > > + if (IS_ERR(ref->dmabuf)) { > > > > > > + rc = PTR_ERR(ref->dmabuf); > > > > > > + goto err_put_dmabuf; > > > > > > + } > > > > > > + > > > > > > + ref->attach = dma_buf_attach(ref->dmabuf, &ref- > > > > > > >shm.ctx- > > > > > > > teedev->dev); > > > > > > + if (IS_ERR(ref->attach)) { > > > > > > + rc = PTR_ERR(ref->attach); > > > > > > + goto err_detach; > > > > > > + } > > > > > > + > > > > > > + ref->sgt = dma_buf_map_attachment(ref->attach, > > > > > > DMA_BIDIRECTIONAL); > > > > > > + if (IS_ERR(ref->sgt)) { > > > > > > + rc = PTR_ERR(ref->sgt); > > > > > > + goto err_unmap_attachement; > > > > > > + } > > > > > > + > > > > > > + if (sg_nents(ref->sgt->sgl) != 1) { > > > > > > + rc = PTR_ERR(ref->sgt->sgl); > > > > > > + goto err_unmap_attachement; > > > > > > + } > > > > > > + > > > > > > + ref->shm.paddr = sg_dma_address(ref->sgt->sgl); > > > > > > + ref->shm.size = sg_dma_len(ref->sgt->sgl); > > > > > > + ref->shm.flags = TEE_SHM_EXT_DMA_BUF; > > > > > > + > > > > > > + mutex_lock(&ref->shm.ctx->teedev->mutex); > > > > > > + ref->shm.id = idr_alloc(&ref->shm.ctx->teedev->idr, > > > > > > &ref->shm, > > > > > > + 1, 0, GFP_KERNEL); > > > > > > + mutex_unlock(&ref->shm.ctx->teedev->mutex); > > > > > > + if (ref->shm.id < 0) { > > > > > > + rc = ref->shm.id; > > > > > > + goto err_idr_remove; > > > > > > + } > > > > > > + > > > > > > + return &ref->shm; > > > > > > + > > > > > > +err_idr_remove: > > > > > > + mutex_lock(&ctx->teedev->mutex); > > > > > > + idr_remove(&ctx->teedev->idr, ref->shm.id); > > > > > > + mutex_unlock(&ctx->teedev->mutex); > > > > > > +err_unmap_attachement: > > > > > > + dma_buf_unmap_attachment(ref->attach, ref->sgt, > > > > > > DMA_BIDIRECTIONAL); > > > > > > +err_detach: > > > > > > + dma_buf_detach(ref->dmabuf, ref->attach); > > > > > > +err_put_dmabuf: > > > > > > + dma_buf_put(ref->dmabuf); > > > > > > + kfree(ref); > > > > > > +err_put_tee: > > > > > > + teedev_ctx_put(ctx); > > > > > > + tee_device_put(ctx->teedev); > > > > > > + > > > > > > + return ERR_PTR(rc); > > > > > > +} > > > > > > +EXPORT_SYMBOL_GPL(tee_shm_register_fd); > > > > > > + > > > > > > static struct tee_shm * > > > > > > register_shm_helper(struct tee_context *ctx, unsigned long > > > > > > addr, > > > > > > size_t length, u32 flags, int id) diff -- > > > > > > git > > > > > > a/include/linux/tee_drv.h b/include/linux/tee_drv.h index > > > > > > 911cad324acc..40ddd5376c2d 100644 > > > > > > --- a/include/linux/tee_drv.h > > > > > > +++ b/include/linux/tee_drv.h > > > > > > @@ -25,6 +25,7 @@ > > > > > > #define TEE_SHM_USER_MAPPED BIT(1) /* Memory mapped in > > > > > > user space > > > > > > */ > > > > > > #define TEE_SHM_POOL BIT(2) /* Memory allocated > > > > > > from pool > > > > > > */ > > > > > > #define TEE_SHM_PRIV BIT(3) /* Memory private to > > > > > > TEE driver > > > > > > */ > > > > > > +#define TEE_SHM_EXT_DMA_BUF BIT(4) /* Memory with dma- > > > > > > buf > > > > > > handle */ > > > > > > > > > > > > struct device; > > > > > > struct tee_device; > > > > > > @@ -276,6 +277,16 @@ struct tee_shm > > > > > > *tee_shm_alloc_kernel_buf(struct > > > > > > tee_context *ctx, size_t size); struct tee_shm > > > > > > *tee_shm_register_kernel_buf(struct tee_context *ctx, > > > > > > void *addr, size_t > > > > > > length); > > > > > > > > > > > > +/** > > > > > > + * tee_shm_register_fd() - Register shared memory from file > > > > > > descriptor > > > > > > + * > > > > > > + * @ctx: Context that allocates the shared memory > > > > > > + * @fd: Shared memory file descriptor reference > > > > > > + * > > > > > > + * @returns a pointer to 'struct tee_shm' on success, and > > > > > > ERR_PTR > > > > > > + on > > > > > > failure > > > > > > + */ > > > > > > +struct tee_shm *tee_shm_register_fd(struct tee_context *ctx, > > > > > > int > > > > > > fd); > > > > > > + > > > > > > /** > > > > > > * tee_shm_is_dynamic() - Check if shared memory object is > > > > > > of the > > > > > > dynamic kind > > > > > > * @shm: Shared memory handle > > > > > > diff --git a/include/uapi/linux/tee.h > > > > > > b/include/uapi/linux/tee.h > > > > > > index 25a6c534beb1..baf3cd7cfdac 100644 > > > > > > --- a/include/uapi/linux/tee.h > > > > > > +++ b/include/uapi/linux/tee.h > > > > > > @@ -121,6 +121,35 @@ struct tee_ioctl_shm_alloc_data { > > > > > > #define TEE_IOC_SHM_ALLOC _IOWR(TEE_IOC_MAGIC, > > > > > > TEE_IOC_BASE + 1, > > > > > > \ > > > > > > struct > > > > > > tee_ioctl_shm_alloc_data) > > > > > > > > > > > > +/** > > > > > > + * struct tee_ioctl_shm_register_fd_data - Shared memory > > > > > > +registering > > > > > > argument > > > > > > + * @fd: [in] File descriptor identifying the > > > > > > shared > > > > > > memory > > > > > > + * @size: [out] Size of shared memory to allocate > > > > > > + * @flags: [in] Flags to/from allocation. > > > > > > + * @id: [out] Identifier of the shared memory > > > > > > + * > > > > > > + * The flags field should currently be zero as input. > > > > > > Updated by > > > > > > + the > > > > > > call > > > > > > + * with actual flags as defined by TEE_IOCTL_SHM_* above. > > > > > > + * This structure is used as argument for > > > > > > TEE_IOC_SHM_REGISTER_FD > > > > > > below. > > > > > > + */ > > > > > > +struct tee_ioctl_shm_register_fd_data { > > > > > > + __s64 fd; > > > > > > + __u64 size; > > > > > > + __u32 flags; > > > > > > + __s32 id; > > > > > > +} __attribute__ ((aligned (8))); > > > > > > + > > > > > > +/** > > > > > > + * TEE_IOC_SHM_REGISTER_FD - register a shared memory from a > > > > > > file > > > > > > descriptor > > > > > > + * > > > > > > + * Returns a file descriptor on success or < 0 on failure > > > > > > + * > > > > > > + * The returned file descriptor refers to the shared memory > > > > > > object > > > > > > in kernel > > > > > > + * land. The shared memory is freed when the descriptor is > > > > > > closed. > > > > > > + */ > > > > > > +#define TEE_IOC_SHM_REGISTER_FD _IOWR(TEE_IOC_MAGIC, > > > > > > TEE_IOC_BASE + 8, \ > > > > > > + struct > > > > > > tee_ioctl_shm_register_fd_data) > > > > > > + > > > > > > /** > > > > > > * struct tee_ioctl_buf_data - Variable sized buffer > > > > > > * @buf_ptr: [in] A __user pointer to a buffer
