add Linaro secure heap compatible reserved mem: linaro,secure-heap use genalloc to allocate/free buffer from buffer pool. buffer pool info is defined from a dts reserved memory.
Signed-off-by: Olivier Masse olivier.masse@nxp.com --- drivers/dma-buf/heaps/Kconfig | 9 + drivers/dma-buf/heaps/Makefile | 1 + drivers/dma-buf/heaps/secure_heap.c | 339 ++++++++++++++++++++++++++++ 3 files changed, 349 insertions(+) create mode 100644 drivers/dma-buf/heaps/secure_heap.c
diff --git a/drivers/dma-buf/heaps/Kconfig b/drivers/dma-buf/heaps/Kconfig index 3782eeeb91c0..c9070c728b9a 100644 --- a/drivers/dma-buf/heaps/Kconfig +++ b/drivers/dma-buf/heaps/Kconfig @@ -20,3 +20,12 @@ 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 + 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 29733f84c354..863ef10056a3 100644 --- a/drivers/dma-buf/heaps/Makefile +++ b/drivers/dma-buf/heaps/Makefile @@ -2,3 +2,4 @@ obj-$(CONFIG_DMABUF_HEAPS_SYSTEM) += system_heap.o obj-$(CONFIG_DMABUF_HEAPS_CMA) += cma_heap.o obj-$(CONFIG_DMABUF_HEAPS_DSP) += dsp_heap.o +obj-$(CONFIG_DMABUF_HEAPS_SECURE) += 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..a3023bf8d457 --- /dev/null +++ b/drivers/dma-buf/heaps/secure_heap.c @@ -0,0 +1,339 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * DMABUF secure heap exporter + * + * Copyright 2022 NXP. + */ + +#include <linux/dma-buf.h> +#include <linux/dma-heap.h> +#include <linux/dma-mapping.h> +#include <linux/err.h> +#include <linux/genalloc.h> +#include <linux/highmem.h> +#include <linux/mm.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_fdt.h> +#include <linux/of_reserved_mem.h> +#include <linux/scatterlist.h> +#include <linux/slab.h> +#include <linux/vmalloc.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; + void *vaddr; +}; + +struct secure_heap_attachment { + struct device *dev; + struct sg_table *table; + struct list_head list; +}; + +struct secure_heap_info { + struct gen_pool *pool; +}; + +struct rmem_secure { + phys_addr_t base; + phys_addr_t size; + + char name[MAX_HEAP_NAME_LEN]; +}; + +static struct rmem_secure secure_data[MAX_SECURE_HEAP] = {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 = kzalloc(sizeof(*new_table), GFP_KERNEL); + if (!new_table) + return ERR_PTR(-ENOMEM); + + ret = sg_alloc_table(new_table, table->orig_nents, GFP_KERNEL); + if (ret) { + kfree(new_table); + return ERR_PTR(-ENOMEM); + } + + new_sg = 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 = sg->dma_address; +#ifdef CONFIG_NEED_SG_DMA_LENGTH + new_sg->dma_length = sg->dma_length; +#endif + new_sg = 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 = dmabuf->priv; + struct secure_heap_attachment *a; + struct sg_table *table; + + a = kzalloc(sizeof(*a), GFP_KERNEL); + if (!a) + return -ENOMEM; + + table = dup_sg_table(&buffer->sg_table); + if (IS_ERR(table)) { + kfree(a); + return PTR_ERR(table); + } + + a->table = table; + a->dev = attachment->dev; + INIT_LIST_HEAD(&a->list); + attachment->priv = 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 = dmabuf->priv; + struct secure_heap_attachment *a = 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 secure_heap_attachment *a = attachment->priv; + + return a->table; +} + +static void secure_heap_unmap_dma_buf(struct dma_buf_attachment *attachment, + struct sg_table *table, + enum dma_data_direction direction) +{ +} + +static void secure_heap_dma_buf_release(struct dma_buf *dmabuf) +{ + struct secure_heap_buffer *buffer = dmabuf->priv; + struct secure_heap_info *info; + struct sg_table *table; + struct scatterlist *sg; + int i; + + info = dma_heap_get_drvdata(buffer->heap); + + table = &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 const struct dma_buf_ops secure_heap_buf_ops = { + .attach = secure_heap_attach, + .detach = secure_heap_detach, + .map_dma_buf = secure_heap_map_dma_buf, + .unmap_dma_buf = secure_heap_unmap_dma_buf, + .release = secure_heap_dma_buf_release, +}; + +static struct dma_buf *secure_heap_allocate(struct dma_heap *heap, + unsigned long len, + unsigned long fd_flags, + unsigned long heap_flags) +{ + struct secure_heap_buffer *buffer; + struct secure_heap_info *info = dma_heap_get_drvdata(heap); + DEFINE_DMA_BUF_EXPORT_INFO(exp_info); + unsigned long size = roundup(len, PAGE_SIZE); + struct dma_buf *dmabuf; + struct sg_table *table; + int ret = -ENOMEM; + unsigned long phy_addr; + + buffer = kzalloc(sizeof(*buffer), GFP_KERNEL); + if (!buffer) + return ERR_PTR(-ENOMEM); + + INIT_LIST_HEAD(&buffer->attachments); + mutex_init(&buffer->lock); + buffer->heap = heap; + buffer->len = size; + + phy_addr = gen_pool_alloc(info->pool, size); + if (!phy_addr) + goto free_buffer; + + table = &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) = phy_addr; + sg_dma_len(table->sgl) = size; + + /* create the dmabuf */ + exp_info.exp_name = dma_heap_get_name(heap); + exp_info.ops = &secure_heap_buf_ops; + exp_info.size = buffer->len; + exp_info.flags = fd_flags; + exp_info.priv = buffer; + dmabuf = dma_buf_export(&exp_info); + if (IS_ERR(dmabuf)) { + ret = PTR_ERR(dmabuf); + goto free_table; + } + + return dmabuf; + +free_table: + 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 const struct dma_heap_ops secure_heap_ops = { + .allocate = 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 = NULL; + struct gen_pool *pool = NULL; + int ret = -EINVAL; + + if (rmem->base == 0 || rmem->size == 0) { + pr_err("secure_data base or size is not correct\n"); + goto error; + } + + info = kzalloc(sizeof(*info), GFP_KERNEL); + if (!info) { + pr_err("dmabuf info allocation failed\n"); + ret = -ENOMEM; + goto error; + } + + pool = gen_pool_create(PAGE_SHIFT, -1); + if (!pool) { + pr_err("can't create gen pool\n"); + ret = -ENOMEM; + goto error; + } + + if (gen_pool_add(pool, rmem->base, rmem->size, -1) < 0) { + pr_err("failed to add memory into pool\n"); + ret = -ENOMEM; + goto error; + } + + info->pool = pool; + + exp_info.name = rmem->name; + exp_info.ops = &secure_heap_ops; + exp_info.priv = info; + + secure_heap = dma_heap_add(&exp_info); + if (IS_ERR(secure_heap)) { + pr_err("dmabuf secure heap allocation failed\n"); + ret = PTR_ERR(secure_heap); + goto error; + } + + return 0; + +error: + if (pool) + gen_pool_destroy(pool); + kfree(info); + + return ret; +} + +static int secure_heap_create(void) +{ + unsigned int i; + int ret; + + for (i = 0; i < secure_data_count; i++) { + ret = secure_heap_add(&secure_data[i]); + if (ret) + return ret; + } + return 0; +} + +static int __init rmem_secure_heap_setup(struct reserved_mem *rmem) +{ + if (secure_data_count < MAX_SECURE_HEAP) { + int name_len = 0; + const char *s = rmem->name; + + secure_data[secure_data_count].base = rmem->base; + secure_data[secure_data_count].size = rmem->size; + + while (name_len < MAX_HEAP_NAME_LEN) { + if ((*s == '@') || (*s == '\0')) + break; + name_len++; + s++; + } + if (name_len == MAX_HEAP_NAME_LEN) + name_len--; + + strncpy(secure_data[secure_data_count].name, rmem->name, name_len); + secure_data[secure_data_count].name[name_len] = '\0'; + + 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");