Add a new ioctl called TEE_IOC_SHM_REGISTER_FD to register a shared memory from a dmabuf file descriptor. This new ioctl will allow the Linux Kernel to register a buffer to be used by the Secure Data Path OPTEE OS feature.
Please find more information here: https://static.linaro.org/connect/san19/presentations/san19-107.pdf
Patch tested on Hikey 6220.
Etienne Carriere (1): tee: new ioctl to a register tee_shm from a dmabuf file descriptor
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(-)
From: Etienne Carriere etienne.carriere@linaro.org
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@linaro.org Signed-off-by: Olivier Masse olivier.masse@nxp.com Reported-by: kernel test robot lkp@intel.com From: https://github.com/linaro-swg/linux.git (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
Hi Olivier,
Thank you for the patch! Yet something to improve:
[auto build test ERROR on drm-misc/drm-misc-next] [also build test ERROR on drm-tip/drm-tip linus/master v5.19 next-20220812] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Olivier-Masse/tee-Add-tee_shm... base: git://anongit.freedesktop.org/drm/drm-misc drm-misc-next config: arm-randconfig-r026-20220814 (https://download.01.org/0day-ci/archive/20220814/202208140900.TNSQFBzy-lkp@i...) compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 3329cec2f79185bafd678f310fafadba2a8c76d2) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # https://github.com/intel-lab-lkp/linux/commit/994ce362c3244904f79f1e7d4cb436... git remote add linux-review https://github.com/intel-lab-lkp/linux git fetch --no-tags linux-review Olivier-Masse/tee-Add-tee_shm_register_fd/20220812-223302 git checkout 994ce362c3244904f79f1e7d4cb436ea162421d1 # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash
If you fix the issue, kindly add following tag where applicable Reported-by: kernel test robot lkp@intel.com
All errors (new ones prefixed by >>, old ones prefixed by <<):
ERROR: modpost: "__aeabi_uldivmod" [drivers/mtd/mtdswap.ko] undefined!
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:
Is there any update on these changes ?
We do not support dynamic secure memory heap.
From Sumit:
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.
Best regards, Olivier MASSE
On ven., 2022-08-12 at 16:30 +0200, Olivier Masse wrote:
Hi guys,
Am 27.01.23 um 11:54 schrieb Olivier Masse:
Just FYI: The upstream changes Dmitry worked on are now committed, so you just need to rebase your work on top and send it out once more.
That's not an issue. If you pin the memory anyway then you can expose it pinned through DMA-buf as well.
The only thing you should avoid is pinning it extra for DMA-buf, because then you often create a really nice possibility for an OOM deny of service.
Regards, Christian.
Hello Christian, Olivier,
On Fri, 27 Jan 2023 at 12:19, Christian König christian.koenig@amd.com wrote:
Could you point out the changes you're referring to? Is it the below change?
I've reviewed this change. It looks good to me, at least for opteee driver side, with few fixes in the tee_shm_register_fd() error case path.
Br, etienne
goto err_put_tee
goto err_put_dmabuf
goto err_detach
goto err_unmap_attachement
Can remove the 4 above lines.
Hi Olivier,
On Fri, 27 Jan 2023 at 16:24, Olivier Masse olivier.masse@nxp.com wrote:
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://lists.trustedfirmware.org/archives/list/op-tee@lists.trustedfirmware...
-Sumit
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.
Regards.
-----Original Message----- From: Sumit Garg sumit.garg@linaro.org Sent: Wednesday, February 1, 2023 6:34 AM To: Olivier Masse olivier.masse@nxp.com Cc: fredgc@google.com; linux-media@vger.kernel.org; linaro-mm-sig@lists.linaro.org; afd@ti.com; op-tee@lists.trustedfirmware.org; jens.wiklander@linaro.org; joakim.bech@linaro.org; sumit.semwal@linaro.org; Peter Griffin peter.griffin@linaro.org; linux-kernel@vger.kernel.org; etienne.carriere@linaro.org; dri-devel@lists.freedesktop.org; christian.koenig@amd.com; Clément Faure clement.faure@nxp.com; Cyrille Fleury cyrille.fleury@nxp.com 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@nxp.com wrote:
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.trus...
-Sumit
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@nxp.com wrote:
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
-Sumit
On Thu, 2 Feb 2023 at 09:35, Sumit Garg sumit.garg@linaro.org wrote:
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....
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
br, etienne
On jeu., 2023-02-02 at 10:58 +0100, Etienne Carriere wrote:
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
This upgrade need a Linux dma-buf patch: https://lore.kernel.org/all/20220805154139.2qkqxwklufjpsfdx@000377403353/T/
Hell all,
+jerome f.
On Fri, 3 Feb 2023 at 12:01, Olivier Masse olivier.masse@nxp.com wrote:
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
On 2/3/23 12:37, Etienne Carriere wrote:
How would that help? I mean, when the kernel patches are merged and if things break we can make the necessary adjustments in the optee_test app or whatever, but in the meantime I don't see much point. I suppose the people who are actively developing the patches do make sure it works with OP-TEE ;-)
Regards,
-----Original Message----- From: Jerome Forissier jerome.forissier@linaro.org Sent: Friday, February 3, 2023 1:32 PM To: Etienne Carriere etienne.carriere@linaro.org; Olivier Masse olivier.masse@nxp.com Cc: sumit.garg@linaro.org; linux-media@vger.kernel.org; fredgc@google.com; linaro-mm-sig@lists.linaro.org; afd@ti.com; op-tee@lists.trustedfirmware.org; jens.wiklander@linaro.org; joakim.bech@linaro.org; sumit.semwal@linaro.org; Cyrille Fleury cyrille.fleury@nxp.com; Peter Griffin peter.griffin@linaro.org; linux-kernel@vger.kernel.org; dri-devel@lists.freedesktop.org; Clément Faure clement.faure@nxp.com; christian.koenig@amd.com Subject: Re: [EXT] Re: [PATCH v2 1/1] tee: new ioctl to a register tee_shm from a dmabuf file descriptor
On 2/3/23 15:12, Cyrille Fleury wrote: Hi all,
As mentioned in the cover letter, this IOCTL got tested by Jens Wiklander jens.wiklander@linaro.org, using Linaro reference board from Hikey 6620: https://lists.trustedfirmware.org/archives/list/op-tee@lists.trustedfirmware... It also works on i.MX8M EVK boards.
My understanding today is we are good to upstream this patch, knowing: - Upstream OPTEE driver should support registering a dmabuf since a while, given how widely dmabuf is used in Linux for passing buffers around between devices. - review is OK - test environment is already available in optee-test - it has been tested on 2 different platforms - the scope of the new ioctl is limited to existing feature in dma-buffer
What is missing from this list preventing to upstream ? Who do we still need to convince ?
Regards.
Hi,
On Fri, Feb 03, 2023 at 02:13:53PM +0000, Cyrille Fleury wrote:
Please address the comments from Etienne and post a new version of the patch based on the latest kernel. Please try to improve the language in the commit message.
Is it possible to update the tests so this can be tested on QEMU in our CI loop? That should help to get the review restarted.
Thanks, Jens
Who do we still need to convince ?
Regards.
Hi,
Hi Jens Could you point the Etienne comment(s) not addressed by the pull request to add register tee_shm ioctl to linux optee-driver? Last comments from Etienne: -> Oh, right. So fine, optee_test is ready for the new flavor of secure buffer fd's. -> @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?.
Regards. Cyrille.
Who do we still need to convince ?
Regards.
Hi Cyrille,
On Mon, Feb 13, 2023 at 1:41 PM Cyrille Fleury cyrille.fleury@nxp.com wrote:
https://lore.kernel.org/lkml/CAN5uoS-nT1Bi0dhf74Hpv9LS6XPeTCdZ7sujAKNjacZ+PN...
There are four comments quite a bit down into the patch.
Cheers, Jens
On Fri, 3 Feb 2023 at 16:31, Olivier Masse olivier.masse@nxp.com wrote:
I would suggest you to club this new ioctl patch with this secure dmabuf heap series so that you can provide a complete SDP use-case picture with a working SDP xtest case.
-Sumit
Hi Olivier,
On Fri, Aug 12, 2022 at 4:31 PM Olivier Masse olivier.masse@nxp.com wrote:
What's new in this V2?
Thanks, Jens
Hi Jens,
On mar., 2022-08-16 at 10:17 +0200, Jens Wiklander wrote:
https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fstatic.lin...
Patch tested on Hikey 6220.
What's new in this V2?
Just updated the cover letter and minor change to fix a build error with gcc-11 for x86 architecture:
./usr/include/linux/tee.h:136:13: error: expected declaration
specifiers or '...' before numeric constant 136 | } __aligned(8); | ^
Best regards, Olivier
Hi Olivier,
On Fri, 12 Aug 2022 at 20:01, Olivier Masse olivier.masse@nxp.com wrote:
AFAIU, for the OP-TEE SDP feature to work you need to have a DMA-BUF heap driver for allocating secure buffers through exposed chardev: "/dev/dma_heap/sdp". Have you tested it with some out-of-tree driver as I can't find it upstream? Also, do you plan to push that upstream as well?
BTW, please add a changelog while sending newer patch-set versions.
-Sumit
On Fri, Aug 19, 2022 at 01:54:31PM +0530, Sumit Garg wrote:
Also after the huge discussion last year dma-buf are agreed to be under the "you need an open source userspace for any new uapi using them" rule that all gpu drivers are under.
Does this exist here? -Daniel
Hi Daniel,
On Wed, 7 Sept 2022 at 01:29, Daniel Vetter daniel@ffwll.ch wrote:
There is already an open source userspace test application using it here [1] [2] demonstrating its use-case. I think that should be sufficient.
[1] https://github.com/OP-TEE/optee_test/blob/master/host/xtest/sdp_basic.c [2] https://github.com/OP-TEE/optee_test/blob/master/host/xtest/sdp_basic.h
-Sumit
Hi Sumit
On ven., 2022-08-19 at 13:54 +0530, Sumit Garg wrote:
https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fstatic.lin...
It has been tested with linaro,secure-heap reserved dma heap memory which is also in review for upstream.
On Thu, 8 Sept 2022 at 14:48, Olivier Masse olivier.masse@nxp.com wrote:
Can you provide the corresponding reference? Also, do keep OP-TEE ML in CC if you send any new iteration for that patch.
-Sumit
linaro-mm-sig@lists.linaro.org