Add a Linaro restricted heap using the linaro,restricted-heap bindings implemented based on the generic restricted heap.
The bindings defines a range of physical restricted memory. The heap manages this address range using genalloc. The allocated dma-buf file descriptor can later be registered with the TEE subsystem for later use via Trusted Applications in the secure world.
Co-developed-by: Olivier Masse olivier.masse@nxp.com Signed-off-by: Olivier Masse olivier.masse@nxp.com Signed-off-by: Jens Wiklander jens.wiklander@linaro.org --- drivers/dma-buf/heaps/Kconfig | 10 ++ drivers/dma-buf/heaps/Makefile | 1 + .../dma-buf/heaps/restricted_heap_linaro.c | 165 ++++++++++++++++++ 3 files changed, 176 insertions(+) create mode 100644 drivers/dma-buf/heaps/restricted_heap_linaro.c
diff --git a/drivers/dma-buf/heaps/Kconfig b/drivers/dma-buf/heaps/Kconfig index 58903bc62ac8..82e2c5d09242 100644 --- a/drivers/dma-buf/heaps/Kconfig +++ b/drivers/dma-buf/heaps/Kconfig @@ -28,3 +28,13 @@ config DMABUF_HEAPS_RESTRICTED_MTK help Enable restricted dma-buf heaps for MediaTek platform. This heap is backed by TEE client interfaces. If in doubt, say N. + +config DMABUF_HEAPS_RESTRICTED_LINARO + bool "Linaro DMA-BUF Restricted Heap" + depends on DMABUF_HEAPS_RESTRICTED + help + Choose this option to enable the Linaro restricted dma-buf heap. + The restricted heap pools are defined according to the DT. Heaps + are allocated in the pools using gen allocater. + If in doubt, say N. + diff --git a/drivers/dma-buf/heaps/Makefile b/drivers/dma-buf/heaps/Makefile index 0028aa9d875f..66b2f67c47b5 100644 --- a/drivers/dma-buf/heaps/Makefile +++ b/drivers/dma-buf/heaps/Makefile @@ -2,4 +2,5 @@ obj-$(CONFIG_DMABUF_HEAPS_CMA) += cma_heap.o obj-$(CONFIG_DMABUF_HEAPS_RESTRICTED) += restricted_heap.o obj-$(CONFIG_DMABUF_HEAPS_RESTRICTED_MTK) += restricted_heap_mtk.o +obj-$(CONFIG_DMABUF_HEAPS_RESTRICTED_LINARO) += restricted_heap_linaro.o obj-$(CONFIG_DMABUF_HEAPS_SYSTEM) += system_heap.o diff --git a/drivers/dma-buf/heaps/restricted_heap_linaro.c b/drivers/dma-buf/heaps/restricted_heap_linaro.c new file mode 100644 index 000000000000..4b08ed514023 --- /dev/null +++ b/drivers/dma-buf/heaps/restricted_heap_linaro.c @@ -0,0 +1,165 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * DMABUF secure heap exporter + * + * Copyright 2021 NXP. + * Copyright 2024 Linaro Limited. + */ + +#define pr_fmt(fmt) "rheap_linaro: " fmt + +#include <linux/dma-buf.h> +#include <linux/err.h> +#include <linux/genalloc.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 "restricted_heap.h" + +#define MAX_HEAP_COUNT 2 +#define HEAP_NAME_LEN 32 + +struct resmem_restricted { + phys_addr_t base; + phys_addr_t size; + + char name[HEAP_NAME_LEN]; + + bool no_map; +}; + +static struct resmem_restricted restricted_data[MAX_HEAP_COUNT] = {0}; +static unsigned int restricted_data_count; + +static int linaro_restricted_memory_allocate(struct restricted_heap *heap, + struct restricted_buffer *buf) +{ + struct gen_pool *pool = heap->priv_data; + unsigned long pa; + int ret; + + buf->size = ALIGN(buf->size, PAGE_SIZE); + pa = gen_pool_alloc(pool, buf->size); + if (!pa) + return -ENOMEM; + + ret = sg_alloc_table(&buf->sg_table, 1, GFP_KERNEL); + if (ret) { + gen_pool_free(pool, pa, buf->size); + return ret; + } + + sg_set_page(buf->sg_table.sgl, phys_to_page(pa), buf->size, 0); + + return 0; +} + +static void linaro_restricted_memory_free(struct restricted_heap *heap, + struct restricted_buffer *buf) +{ + struct gen_pool *pool = heap->priv_data; + struct scatterlist *sg; + unsigned int i; + + for_each_sg(buf->sg_table.sgl, sg, buf->sg_table.nents, i) + gen_pool_free(pool, page_to_phys(sg_page(sg)), sg->length); + sg_free_table(&buf->sg_table); +} + +static const struct restricted_heap_ops linaro_restricted_heap_ops = { + .alloc = linaro_restricted_memory_allocate, + .free = linaro_restricted_memory_free, +}; + +static int add_heap(struct resmem_restricted *mem) +{ + struct restricted_heap *heap; + struct gen_pool *pool; + int ret; + + if (mem->base == 0 || mem->size == 0) { + pr_err("restricted_data base or size is not correct\n"); + return -EINVAL; + } + + heap = kzalloc(sizeof(*heap), GFP_KERNEL); + if (!heap) + return -ENOMEM; + + pool = gen_pool_create(PAGE_SHIFT, -1); + if (!pool) { + ret = -ENOMEM; + goto err_free_heap; + } + + ret = gen_pool_add(pool, mem->base, mem->size, -1); + if (ret) + goto err_free_pool; + + heap->no_map = mem->no_map; + heap->priv_data = pool; + heap->name = mem->name; + heap->ops = &linaro_restricted_heap_ops; + + ret = restricted_heap_add(heap); + if (ret) + goto err_free_pool; + + return 0; + +err_free_pool: + gen_pool_destroy(pool); +err_free_heap: + kfree(heap); + + return ret; +} + +static int __init rmem_restricted_heap_setup(struct reserved_mem *rmem) +{ + size_t len = HEAP_NAME_LEN; + const char *s; + bool no_map; + + if (WARN_ONCE(restricted_data_count >= MAX_HEAP_COUNT, + "Cannot handle more than %u restricted heaps\n", + MAX_HEAP_COUNT)) + return -EINVAL; + + no_map = of_get_flat_dt_prop(rmem->fdt_node, "no-map", NULL); + s = strchr(rmem->name, '@'); + if (s) + len = umin(s - rmem->name + 1, len); + + restricted_data[restricted_data_count].base = rmem->base; + restricted_data[restricted_data_count].size = rmem->size; + restricted_data[restricted_data_count].no_map = no_map; + strscpy(restricted_data[restricted_data_count].name, rmem->name, len); + + restricted_data_count++; + return 0; +} + +RESERVEDMEM_OF_DECLARE(linaro_restricted_heap, "linaro,restricted-heap", + rmem_restricted_heap_setup); + +static int linaro_restricted_heap_init(void) +{ + unsigned int i; + int ret; + + for (i = 0; i < restricted_data_count; i++) { + ret = add_heap(&restricted_data[i]); + if (ret) + return ret; + } + return 0; +} + +module_init(linaro_restricted_heap_init); +MODULE_DESCRIPTION("Linaro Restricted Heap Driver"); +MODULE_LICENSE("GPL");