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Wed, 3 Aug 2022 11:07:54 +0000 Received: from AM0PR04MB6737.eurprd04.prod.outlook.com ([fe80::6ca7:299e:d92f:7d1b]) by AM0PR04MB6737.eurprd04.prod.outlook.com ([fe80::6ca7:299e:d92f:7d1b%5]) with mapi id 15.20.5482.011; Wed, 3 Aug 2022 11:07:54 +0000 From: Olivier Masse To: "brian.starkey@arm.com" CC: "sumit.semwal@linaro.org" , "linux-kernel@vger.kernel.org" , "linaro-mm-sig@lists.linaro.org" , "christian.koenig@amd.com" , "linux-media@vger.kernel.org" , "nd@arm.com" , =?iso-8859-15?Q?Cl=E9ment_Faure?= , "dri-devel@lists.freedesktop.org" , "benjamin.gaignard@collabora.com" Subject: Re: [EXT] Re: [PATCH 3/5] dma-buf: heaps: add Linaro secure dmabuf heap support Thread-Topic: [EXT] Re: [PATCH 3/5] dma-buf: heaps: add Linaro secure dmabuf heap support Thread-Index: AQHYplZ4V/zP2ovEr0Os9Wz8+HCUmq2brpEAgAFXDgA= Date: Wed, 3 Aug 2022 11:07:54 +0000 Message-ID: References: <20220802095843.14614-1-olivier.masse@nxp.com> <20220802095843.14614-4-olivier.masse@nxp.com> <20220802143908.24vemxeon537cad2@000377403353> In-Reply-To: <20220802143908.24vemxeon537cad2@000377403353> Accept-Language: fr-FR, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: Evolution 3.28.5-0ubuntu0.18.04.2 authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nxp.com; 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charset="iso-8859-15" Content-ID: <162F6DFB10BE044887B8F9B0F8520F99@eurprd04.prod.outlook.com> Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: AM0PR04MB6737.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: b5370f8b-2b3e-41be-d495-08da75406a0e X-MS-Exchange-CrossTenant-originalarrivaltime: 03 Aug 2022 11:07:54.3747 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: 1d7RQzGn4SBWtUaXDtwyfsvBVGcE9OBHIkE+eJ6azQ+Wswy6WCmF3pV4radaCe9g+RI0q3XNQA3bO/E9qBnrhA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: PA4PR04MB7565 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Brian, Thanks for your comments, please find my reply below. On mar., 2022-08-02 at 15:39 +0100, Brian Starkey wrote: > Caution: EXT Email >=20 > Hi Olivier, >=20 > Some comments below as I mentioned off-list. >=20 > One additional point: some devices need to know if a buffer is > protected, so that they can configure registers appropriately to make > use of that protected buffer. There was previously a discussion about > adding a flag to a dma_buf to indicate that it is allocated from > protected memory[1]. >=20 > [1]=20 > https://eur01.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Flists= .freedesktop.org%2Farchives%2Fdri-devel%2F2019-September%2F238059.html&= data=3D05%7C01%7Colivier.masse%40nxp.com%7C64e0ce1952ac4e926a8208da7494d0bb= %7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C637950479760002497%7CUnknown%= 7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6M= n0%3D%7C3000%7C%7C%7C&sdata=3Dbmlw9uLeGtn%2F7JliZ07nSm6XDEzEqdwn4mBQHIV= nma0%3D&reserved=3D0 >=20 >=20 Interesting, could we introduce is_protected 1-bit flag into struct dma_buf ? struct dma_buf_ops.map_dma_buf and struct dma_buf_ops.unmap_dma_buf could become optional for such buffer ? > On Tue, Aug 02, 2022 at 11:58:41AM +0200, Olivier Masse wrote: > > add Linaro secure heap bindings: linaro,secure-heap > > use genalloc to allocate/free buffer from buffer pool. > > buffer pool info is from dts. > > use sg_table instore the allocated memory info, the length of > > sg_table is 1. > > implement secure_heap_buf_ops to implement buffer share in > > difference device: > > 1. Userspace passes this fd to all drivers it wants this buffer > > to share with: First the filedescriptor is converted to a &dma_buf > > using > > dma_buf_get(). Then the buffer is attached to the device using > > dma_buf_attach(). > > 2. Once the buffer is attached to all devices userspace can > > initiate DMA > > access to the shared buffer. In the kernel this is done by calling > > dma_buf_map_attachment() > > 3. get sg_table with dma_buf_map_attachment in difference device. > >=20 > > Signed-off-by: Olivier Masse > > --- > > drivers/dma-buf/heaps/Kconfig | 21 +- > > drivers/dma-buf/heaps/Makefile | 1 + > > drivers/dma-buf/heaps/secure_heap.c | 588 > > ++++++++++++++++++++++++++++ > > 3 files changed, 606 insertions(+), 4 deletions(-) > > create mode 100644 drivers/dma-buf/heaps/secure_heap.c > >=20 > > diff --git a/drivers/dma-buf/heaps/Kconfig b/drivers/dma- > > buf/heaps/Kconfig > > index 6a33193a7b3e..b2406932192e 100644 > > --- a/drivers/dma-buf/heaps/Kconfig > > +++ b/drivers/dma-buf/heaps/Kconfig > > @@ -1,8 +1,12 @@ > > -config DMABUF_HEAPS_DEFERRED_FREE > > - tristate > > +menuconfig DMABUF_HEAPS_DEFERRED_FREE > > + bool "DMA-BUF heaps deferred-free library" > > + help > > + Choose this option to enable the DMA-BUF heaps deferred- > > free library. > >=20 > > -config DMABUF_HEAPS_PAGE_POOL > > - tristate > > +menuconfig DMABUF_HEAPS_PAGE_POOL > > + bool "DMA-BUF heaps page-pool library" > > + help > > + Choose this option to enable the DMA-BUF heaps page-pool > > library. > >=20 > > config DMABUF_HEAPS_SYSTEM > > bool "DMA-BUF System Heap" > > @@ -26,3 +30,12 @@ config DMABUF_HEAPS_DSP > > Choose this option to enable the dsp dmabuf heap. The > > dsp heap > > is allocated by gen allocater. it's allocated according > > the dts. > > If in doubt, say Y. > > + > > +config DMABUF_HEAPS_SECURE > > + tristate "DMA-BUF Secure Heap" > > + depends on DMABUF_HEAPS && DMABUF_HEAPS_DEFERRED_FREE > > + help > > + Choose this option to enable the secure dmabuf heap. The > > secure heap > > + pools are defined according to the DT. Heaps are allocated > > + in the pools using gen allocater. > > + If in doubt, say Y. > > diff --git a/drivers/dma-buf/heaps/Makefile b/drivers/dma- > > buf/heaps/Makefile > > index e70722ea615e..08f6aa5919d1 100644 > > --- a/drivers/dma-buf/heaps/Makefile > > +++ b/drivers/dma-buf/heaps/Makefile > > @@ -4,3 +4,4 @@ obj-$(CONFIG_DMABUF_HEAPS_PAGE_POOL) +=3D > > page_pool.o > > obj-$(CONFIG_DMABUF_HEAPS_SYSTEM) +=3D system_heap.o > > obj-$(CONFIG_DMABUF_HEAPS_CMA) +=3D cma_heap.o > > obj-$(CONFIG_DMABUF_HEAPS_DSP) +=3D dsp_heap.o > > +obj-$(CONFIG_DMABUF_HEAPS_SECURE) +=3D secure_heap.o > > diff --git a/drivers/dma-buf/heaps/secure_heap.c b/drivers/dma- > > buf/heaps/secure_heap.c > > new file mode 100644 > > index 000000000000..31aac5d050b4 > > --- /dev/null > > +++ b/drivers/dma-buf/heaps/secure_heap.c > > @@ -0,0 +1,588 @@ > > +// SPDX-License-Identifier: GPL-2.0 > > +/* > > + * DMABUF secure heap exporter > > + * > > + * Copyright 2021 NXP. > > + */ > > + > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > + > > +#include "deferred-free-helper.h" > > +#include "page_pool.h" > > + > > +#define MAX_SECURE_HEAP 2 > > +#define MAX_HEAP_NAME_LEN 32 > > + > > +struct secure_heap_buffer { > > + struct dma_heap *heap; > > + struct list_head attachments; > > + struct mutex lock; > > + unsigned long len; > > + struct sg_table sg_table; > > + int vmap_cnt; > > + struct deferred_freelist_item deferred_free; > > + void *vaddr; > > + bool uncached; > > +}; > > + > > +struct dma_heap_attachment { > > + struct device *dev; > > + struct sg_table *table; > > + struct list_head list; > > + bool no_map; > > + bool mapped; > > + bool uncached; > > +}; >=20 > I think dma_heap_attachment should have a more specific name, > otherwise it looks like some generic part of the dma_heap framework. ok, how about secure_heap_attachment which sound more logical ? >=20 > > + > > +struct secure_heap_info { > > + struct gen_pool *pool; > > + > > + bool no_map; > > +}; > > + > > +struct rmem_secure { > > + phys_addr_t base; > > + phys_addr_t size; > > + > > + char name[MAX_HEAP_NAME_LEN]; > > + > > + bool no_map; > > +}; > > + > > +static struct rmem_secure secure_data[MAX_SECURE_HEAP] =3D {0}; > > +static unsigned int secure_data_count; > > + > > +static struct sg_table *dup_sg_table(struct sg_table *table) > > +{ > > + struct sg_table *new_table; > > + int ret, i; > > + struct scatterlist *sg, *new_sg; > > + > > + new_table =3D kzalloc(sizeof(*new_table), GFP_KERNEL); > > + if (!new_table) > > + return ERR_PTR(-ENOMEM); > > + > > + ret =3D sg_alloc_table(new_table, table->orig_nents, > > GFP_KERNEL); > > + if (ret) { > > + kfree(new_table); > > + return ERR_PTR(-ENOMEM); > > + } > > + > > + new_sg =3D new_table->sgl; > > + for_each_sgtable_sg(table, sg, i) { > > + sg_set_page(new_sg, sg_page(sg), sg->length, sg- > > >offset); > > + new_sg->dma_address =3D sg->dma_address; > > +#ifdef CONFIG_NEED_SG_DMA_LENGTH > > + new_sg->dma_length =3D sg->dma_length; > > +#endif > > + new_sg =3D sg_next(new_sg); > > + } > > + > > + return new_table; > > +} > > + > > +static int secure_heap_attach(struct dma_buf *dmabuf, > > + struct dma_buf_attachment *attachment) > > +{ > > + struct secure_heap_buffer *buffer =3D dmabuf->priv; > > + struct secure_heap_info *info =3D dma_heap_get_drvdata(buffer- > > >heap); > > + struct dma_heap_attachment *a; > > + struct sg_table *table; > > + > > + a =3D kzalloc(sizeof(*a), GFP_KERNEL); > > + if (!a) > > + return -ENOMEM; > > + > > + table =3D dup_sg_table(&buffer->sg_table); > > + if (IS_ERR(table)) { > > + kfree(a); > > + return -ENOMEM; > > + } > > + > > + a->table =3D table; > > + a->dev =3D attachment->dev; > > + INIT_LIST_HEAD(&a->list); > > + a->no_map =3D info->no_map; > > + a->mapped =3D false; > > + a->uncached =3D buffer->uncached; > > + attachment->priv =3D a; > > + > > + mutex_lock(&buffer->lock); > > + list_add(&a->list, &buffer->attachments); > > + mutex_unlock(&buffer->lock); > > + > > + return 0; > > +} > > + > > +static void secure_heap_detach(struct dma_buf *dmabuf, > > + struct dma_buf_attachment *attachment) > > +{ > > + struct secure_heap_buffer *buffer =3D dmabuf->priv; > > + struct dma_heap_attachment *a =3D attachment->priv; > > + > > + mutex_lock(&buffer->lock); > > + list_del(&a->list); > > + mutex_unlock(&buffer->lock); > > + > > + sg_free_table(a->table); > > + kfree(a->table); > > + kfree(a); > > +} > > + > > +static struct sg_table *secure_heap_map_dma_buf(struct > > dma_buf_attachment *attachment, > > + enum > > dma_data_direction direction) > > +{ > > + struct dma_heap_attachment *a =3D attachment->priv; > > + struct sg_table *table =3D a->table; > > + int attr =3D 0; > > + int ret; > > + > > + if (!a->no_map) { >=20 > This looks strange - you're expecting this driver to be used on > regions with no-map set, but if no-map _is_ set, you don't allow the > dma_buf to get mapped to any devices. Doesn't that mean that these > buffers can never actually be used? if no-map is not set, map_dma_buf is mapping the buffer. >=20 > > + if (a->uncached) > > + attr =3D DMA_ATTR_SKIP_CPU_SYNC; > > + >=20 > If the CPU can never touch these buffers, is cached vs uncached > meaningful? indeed, but as dma_buf_ops.map_dma_buf is mandatory, this flag as well as no-map were introduce to manage uncached mapped buffer. to simplify everything, secure-heap could get rid of no-map and uncached flags and set an is_protected flag in dma_buf ? > If the TEE touches the buffers from the CPU then perhaps the TEE > would > need to do cache maintenance, but I'd expect that to be managed in > the > TEE. yes, if needed cache maintenance should be done in TA. >=20 > > + ret =3D dma_map_sgtable(attachment->dev, table, > > direction, attr); > > + if (ret) > > + return ERR_PTR(ret); > > + > > + a->mapped =3D true; > > + } > > + > > + return table; > > +} > > + > > +static void secure_heap_unmap_dma_buf(struct dma_buf_attachment > > *attachment, > > + struct sg_table *table, > > + enum dma_data_direction > > direction) > > +{ > > + struct dma_heap_attachment *a =3D attachment->priv; > > + int attr =3D 0; > > + > > + if (!a->no_map) { > > + if (a->uncached) > > + attr =3D DMA_ATTR_SKIP_CPU_SYNC; > > + > > + a->mapped =3D false; > > + dma_unmap_sgtable(attachment->dev, table, direction, > > attr); > > + } > > +} > > + > > +static int secure_heap_dma_buf_begin_cpu_access(struct dma_buf > > *dmabuf, > > + enum > > dma_data_direction direction) >=20 > If the firewall is preventing CPU accesses, then shouldn't > begin_cpu_access and end_cpu_access either fail or be a no-op? true, both of them are optional and could be removed. >=20 > > +{ > > + struct secure_heap_buffer *buffer =3D dmabuf->priv; > > + struct dma_heap_attachment *a; > > + > > + mutex_lock(&buffer->lock); > > + > > + if (buffer->vmap_cnt) > > + invalidate_kernel_vmap_range(buffer->vaddr, buffer- > > >len); > > + > > + if (!buffer->uncached) { > > + list_for_each_entry(a, &buffer->attachments, list) { > > + if (!a->mapped) > > + continue; > > + dma_sync_sgtable_for_cpu(a->dev, a->table, > > direction); > > + } > > + } > > + mutex_unlock(&buffer->lock); > > + > > + return 0; > > +} > > + > > +static int secure_heap_dma_buf_end_cpu_access(struct dma_buf > > *dmabuf, > > + enum dma_data_direction > > direction) > > +{ > > + struct secure_heap_buffer *buffer =3D dmabuf->priv; > > + struct dma_heap_attachment *a; > > + > > + mutex_lock(&buffer->lock); > > + > > + if (buffer->vmap_cnt) > > + flush_kernel_vmap_range(buffer->vaddr, buffer->len); > > + > > + if (!buffer->uncached) { > > + list_for_each_entry(a, &buffer->attachments, list) { > > + if (!a->mapped) > > + continue; > > + dma_sync_sgtable_for_device(a->dev, a->table,=20 > > direction); > > + } > > + } > > + mutex_unlock(&buffer->lock); > > + > > + return 0; > > +} > > + > > +static int secure_heap_mmap(struct dma_buf *dmabuf, struct > > vm_area_struct *vma) > > +{ > > + struct secure_heap_buffer *buffer =3D dmabuf->priv; > > + struct sg_table *table =3D &buffer->sg_table; > > + unsigned long addr =3D vma->vm_start; > > + struct sg_page_iter piter; > > + int ret; > > + > > + if (buffer->uncached) > > + vma->vm_page_prot =3D pgprot_writecombine(vma- > > >vm_page_prot); > > + > > + for_each_sgtable_page(table, &piter, vma->vm_pgoff) { > > + struct page *page =3D sg_page_iter_page(&piter); > > + > > + ret =3D remap_pfn_range(vma, addr, page_to_pfn(page), > > PAGE_SIZE, > > + vma->vm_page_prot); >=20 > If the CPU can't touch these buffers, what would they be mapped to > userspace for? again, let's remove this optional ops. >=20 > > + if (ret) > > + return ret; > > + addr +=3D PAGE_SIZE; > > + } > > + return 0; > > +} > > + > > +static void *secure_heap_do_vmap(struct secure_heap_buffer > > *buffer) > > +{ > > + struct sg_table *table =3D &buffer->sg_table; > > + int npages =3D PAGE_ALIGN(buffer->len) / PAGE_SIZE; > > + struct page **pages =3D vmalloc(sizeof(struct page *) * > > npages); > > + struct page **tmp =3D pages; > > + struct sg_page_iter piter; > > + pgprot_t pgprot =3D PAGE_KERNEL; > > + void *vaddr; > > + > > + if (!pages) > > + return ERR_PTR(-ENOMEM); > > + > > + if (buffer->uncached) > > + pgprot =3D pgprot_writecombine(PAGE_KERNEL); > > + > > + for_each_sgtable_page(table, &piter, 0) { > > + WARN_ON(tmp - pages >=3D npages); > > + *tmp++ =3D sg_page_iter_page(&piter); > > + } > > + > > + vaddr =3D vmap(pages, npages, VM_MAP, pgprot); > > + vfree(pages); >=20 > Similar to above, if the CPU can't touch these buffers, what would be > the point of mapping them to the kernel? indeed, useless code. >=20 > > + > > + if (!vaddr) > > + return ERR_PTR(-ENOMEM); > > + > > + return vaddr; > > +} > > + > > +static int secure_heap_vmap(struct dma_buf *dmabuf, struct > > dma_buf_map *map) > > +{ > > + struct secure_heap_buffer *buffer =3D dmabuf->priv; > > + void *vaddr; > > + int ret =3D 0; > > + > > + mutex_lock(&buffer->lock); > > + if (buffer->vmap_cnt) { > > + buffer->vmap_cnt++; > > + goto out; > > + } > > + > > + vaddr =3D secure_heap_do_vmap(buffer); > > + if (IS_ERR(vaddr)) { > > + ret =3D PTR_ERR(vaddr); > > + goto out; > > + } > > + > > + buffer->vaddr =3D vaddr; > > + buffer->vmap_cnt++; > > + dma_buf_map_set_vaddr(map, buffer->vaddr); > > +out: > > + mutex_unlock(&buffer->lock); > > + > > + return ret; > > +} > > + > > +static void secure_heap_vunmap(struct dma_buf *dmabuf, struct > > dma_buf_map *map) > > +{ > > + struct secure_heap_buffer *buffer =3D dmabuf->priv; > > + > > + mutex_lock(&buffer->lock); > > + if (!--buffer->vmap_cnt) { > > + vunmap(buffer->vaddr); > > + buffer->vaddr =3D NULL; > > + } > > + mutex_unlock(&buffer->lock); > > + dma_buf_map_clear(map); > > +} > > + > > +static void secure_heap_zero_buffer(struct secure_heap_buffer > > *buffer) > > +{ > > + struct sg_table *sgt =3D &buffer->sg_table; > > + struct sg_page_iter piter; > > + struct page *p; > > + void *vaddr; > > + > > + for_each_sgtable_page(sgt, &piter, 0) { > > + p =3D sg_page_iter_page(&piter); > > + vaddr =3D kmap_atomic(p); > > + memset(vaddr, 0, PAGE_SIZE); >=20 > How can you do memset on the buffer if the firewall is preventing CPU > accesses? >=20 yes, useless if we set a secure flag to prevent driver from mapping allocated buffer. > > + kunmap_atomic(vaddr); > > + } > > +} > > + > > +static void secure_heap_buf_free(struct deferred_freelist_item > > *item, > > + enum df_reason reason) > > +{ > > + struct secure_heap_buffer *buffer; > > + struct secure_heap_info *info; > > + struct sg_table *table; > > + struct scatterlist *sg; > > + int i; > > + > > + buffer =3D container_of(item, struct secure_heap_buffer, > > deferred_free); > > + info =3D dma_heap_get_drvdata(buffer->heap); > > + > > + if (!info->no_map) { > > + // Zero the buffer pages before adding back to the > > pool > > + if (reason =3D=3D DF_NORMAL) > > + secure_heap_zero_buffer(buffer); > > + } > > + > > + table =3D &buffer->sg_table; > > + for_each_sg(table->sgl, sg, table->nents, i) > > + gen_pool_free(info->pool, sg_dma_address(sg), > > sg_dma_len(sg)); > > + > > + sg_free_table(table); > > + kfree(buffer); > > +} > > + > > +static void secure_heap_dma_buf_release(struct dma_buf *dmabuf) > > +{ > > + struct secure_heap_buffer *buffer =3D dmabuf->priv; > > + int npages =3D PAGE_ALIGN(buffer->len) / PAGE_SIZE; > > + > > + deferred_free(&buffer->deferred_free, secure_heap_buf_free, > > npages); > > +} > > + > > +static const struct dma_buf_ops secure_heap_buf_ops =3D { > > + .attach =3D secure_heap_attach, > > + .detach =3D secure_heap_detach, > > + .map_dma_buf =3D secure_heap_map_dma_buf, > > + .unmap_dma_buf =3D secure_heap_unmap_dma_buf, > > + .begin_cpu_access =3D secure_heap_dma_buf_begin_cpu_access, > > + .end_cpu_access =3D secure_heap_dma_buf_end_cpu_access, > > + .mmap =3D secure_heap_mmap, > > + .vmap =3D secure_heap_vmap, > > + .vunmap =3D secure_heap_vunmap, > > + .release =3D secure_heap_dma_buf_release, > > +}; > > + > > +static struct dma_buf *secure_heap_do_allocate(struct dma_heap > > *heap, > > + unsigned long len, > > + unsigned long > > fd_flags, > > + unsigned long > > heap_flags, > > + bool uncached) > > +{ > > + struct secure_heap_buffer *buffer; > > + struct secure_heap_info *info =3D dma_heap_get_drvdata(heap); > > + DEFINE_DMA_BUF_EXPORT_INFO(exp_info); > > + unsigned long size =3D roundup(len, PAGE_SIZE); > > + struct dma_buf *dmabuf; > > + struct sg_table *table; > > + int ret =3D -ENOMEM; > > + unsigned long phy_addr; > > + > > + buffer =3D kzalloc(sizeof(*buffer), GFP_KERNEL); > > + if (!buffer) > > + return ERR_PTR(-ENOMEM); > > + > > + INIT_LIST_HEAD(&buffer->attachments); > > + mutex_init(&buffer->lock); > > + buffer->heap =3D heap; > > + buffer->len =3D size; > > + buffer->uncached =3D uncached; > > + > > + phy_addr =3D gen_pool_alloc(info->pool, size); > > + if (!phy_addr) > > + goto free_buffer; > > + > > + table =3D &buffer->sg_table; > > + if (sg_alloc_table(table, 1, GFP_KERNEL)) > > + goto free_pool; > > + > > + sg_set_page(table->sgl, phys_to_page(phy_addr), size, 0); > > + sg_dma_address(table->sgl) =3D phy_addr; > > + sg_dma_len(table->sgl) =3D size; > > + > > + /* create the dmabuf */ > > + exp_info.exp_name =3D dma_heap_get_name(heap); > > + exp_info.ops =3D &secure_heap_buf_ops; > > + exp_info.size =3D buffer->len; > > + exp_info.flags =3D fd_flags; > > + exp_info.priv =3D buffer; > > + dmabuf =3D dma_buf_export(&exp_info); > > + if (IS_ERR(dmabuf)) { > > + ret =3D PTR_ERR(dmabuf); > > + goto free_pages; > > + } > > + > > + return dmabuf; > > + > > +free_pages: > > + sg_free_table(table); > > + > > +free_pool: > > + gen_pool_free(info->pool, phy_addr, size); > > + > > +free_buffer: > > + mutex_destroy(&buffer->lock); > > + kfree(buffer); > > + > > + return ERR_PTR(ret); > > +} > > + > > +static struct dma_buf *secure_heap_allocate(struct dma_heap *heap, > > + unsigned long len, > > + unsigned long fd_flags, > > + unsigned long heap_flags) > > +{ > > + // use uncache buffer here by default > > + return secure_heap_do_allocate(heap, len, fd_flags, > > heap_flags, true); > > + // use cache buffer > > + // return secure_heap_do_allocate(heap, len, fd_flags, > > heap_flags, false); > > +} > > + > > +static const struct dma_heap_ops secure_heap_ops =3D { > > + .allocate =3D secure_heap_allocate, > > +}; > > + > > +static int secure_heap_add(struct rmem_secure *rmem) > > +{ > > + struct dma_heap *secure_heap; > > + struct dma_heap_export_info exp_info; > > + struct secure_heap_info *info =3D NULL; > > + struct gen_pool *pool =3D NULL; > > + int ret =3D -EINVAL; > > + > > + if (rmem->base =3D=3D 0 || rmem->size =3D=3D 0) { > > + pr_err("secure_data base or size is not correct\n"); > > + goto error; > > + } > > + > > + info =3D kzalloc(sizeof(*info), GFP_KERNEL); > > + if (!info) { > > + pr_err("dmabuf info allocation failed\n"); > > + ret =3D -ENOMEM; > > + goto error; > > + } > > + > > + pool =3D gen_pool_create(PAGE_SHIFT, -1); > > + if (!pool) { > > + pr_err("can't create gen pool\n"); > > + ret =3D -ENOMEM; > > + goto error; > > + } > > + > > + if (gen_pool_add(pool, rmem->base, rmem->size, -1) < 0) { > > + pr_err("failed to add memory into pool\n"); > > + ret =3D -ENOMEM; > > + goto error; > > + } > > + > > + info->pool =3D pool; > > + info->no_map =3D rmem->no_map; >=20 > This kind of heap probably can't work if the region doesn't have > no-map, so I think it would make sense to enforce that no_map is set > (or ignore regions without no-map in DT). if no-map is not set, secure-heap could be used as a heap with dynamically protected buffer from the TEE. but I agree that this is adding too much complexity and could be simplify a lot without this mapping consideration. then no-map is probably not the perfect term to describe this heap. is_s ecure or is_protected would be better ? >=20 > Cheers, > -Brian >=20 > > + > > + exp_info.name =3D rmem->name; > > + exp_info.ops =3D &secure_heap_ops; > > + exp_info.priv =3D info; > > + > > + secure_heap =3D dma_heap_add(&exp_info); > > + if (IS_ERR(secure_heap)) { > > + pr_err("dmabuf secure heap allocation failed\n"); > > + ret =3D PTR_ERR(secure_heap); > > + goto error; > > + } > > + > > + return 0; > > + > > +error: > > + kfree(info); > > + if (pool) > > + gen_pool_destroy(pool); > > + > > + return ret; > > +} > > + > > +static int secure_heap_create(void) > > +{ > > + unsigned int i; > > + int ret; > > + > > + for (i =3D 0; i < secure_data_count; i++) { > > + ret =3D secure_heap_add(&secure_data[i]); > > + if (ret) > > + return ret; > > + } > > + return 0; > > +} > > + > > +static int rmem_secure_heap_device_init(struct reserved_mem *rmem, > > + struct device *dev) > > +{ > > + dev_set_drvdata(dev, rmem); > > + return 0; > > +} > > + > > +static void rmem_secure_heap_device_release(struct reserved_mem > > *rmem, > > + struct device *dev) > > +{ > > + dev_set_drvdata(dev, NULL); > > +} > > + > > +static const struct reserved_mem_ops rmem_dma_ops =3D { > > + .device_init =3D rmem_secure_heap_device_init, > > + .device_release =3D rmem_secure_heap_device_release, > > +}; > > + > > +static int __init rmem_secure_heap_setup(struct reserved_mem > > *rmem) > > +{ > > + if (secure_data_count < MAX_SECURE_HEAP) { > > + int name_len =3D 0; > > + char *s =3D rmem->name; > > + > > + secure_data[secure_data_count].base =3D rmem->base; > > + secure_data[secure_data_count].size =3D rmem->size; > > + secure_data[secure_data_count].no_map =3D > > + (of_get_flat_dt_prop(rmem->fdt_node, "no- > > map", NULL) !=3D NULL); > > + > > + while (name_len < MAX_HEAP_NAME_LEN) { > > + if ((*s =3D=3D '@') || (*s =3D=3D '\0')) > > + break; > > + name_len++; > > + s++; > > + } > > + if (name_len =3D=3D MAX_HEAP_NAME_LEN) > > + name_len--; > > + > > + strncpy(secure_data[secure_data_count].name, rmem- > > >name, name_len); > > + > > + rmem->ops =3D &rmem_dma_ops; > > + pr_info("Reserved memory: DMA buf secure pool %s at > > %pa, size %ld MiB\n", > > + secure_data[secure_data_count].name, > > + &rmem->base, (unsigned long)rmem->size / > > SZ_1M); > > + > > + secure_data_count++; > > + return 0; > > + } > > + WARN_ONCE(1, "Cannot handle more than %u secure heaps\n", > > MAX_SECURE_HEAP); > > + return -EINVAL; > > +} > > + > > +RESERVEDMEM_OF_DECLARE(secure_heap, "linaro,secure-heap", > > rmem_secure_heap_setup); > > + > > +module_init(secure_heap_create); > > +MODULE_LICENSE("GPL v2"); > > -- > > 2.25.0 > >=20