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Message-ID: <CAFA6WYOw9jbKFA5rvsNt7fqRNgirH2ueH3pRKKSmC9HAmmcfhA@mail.gmail.com>
Date: Mon, 30 Oct 2023 14:34:29 +0530
From: Sumit Garg <sumit.garg@...aro.org>
To: Jens Wiklander <jens.wiklander@...aro.org>
Cc: linux-kernel@...r.kernel.org, op-tee@...ts.trustedfirmware.org,
Jerome Forissier <jerome.forissier@...aro.org>,
Shyam Saini <shyamsaini@...ux.microsoft.com>
Subject: Re: [PATCH] optee: add page list to kernel private shared memory
Hi Jens,
Can we split this change into 2 patches for ease of review?
On Thu, 26 Oct 2023 at 22:47, Jens Wiklander <jens.wiklander@...aro.org> wrote:
>
> Until now has kernel private shared memory allocated as dynamic shared
> memory (not from the static shared memory pool) been returned without a
> list of physical pages on allocations via RPC. To support allocations
> larger than one page add a list of physical pages for all allocations
> larger than one page.
The second patch.
> Allocate the memory with alloc_pages_exact()
> instead of alloc_pages() for more efficient memory usage.
The first patch.
-Sumit
>
> Signed-off-by: Jens Wiklander <jens.wiklander@...aro.org>
> ---
> drivers/tee/optee/core.c | 59 +++++++++++++++++++++++++------------
> drivers/tee/optee/smc_abi.c | 45 +++++++++++++---------------
> 2 files changed, 61 insertions(+), 43 deletions(-)
>
> diff --git a/drivers/tee/optee/core.c b/drivers/tee/optee/core.c
> index 2a258bd3b6b5..60fe351ee5c8 100644
> --- a/drivers/tee/optee/core.c
> +++ b/drivers/tee/optee/core.c
> @@ -26,24 +26,36 @@ int optee_pool_op_alloc_helper(struct tee_shm_pool *pool, struct tee_shm *shm,
> size_t num_pages,
> unsigned long start))
> {
> - unsigned int order = get_order(size);
> - struct page *page;
> + size_t nr_pages = roundup(size, PAGE_SIZE) / PAGE_SIZE;
> + unsigned int i;
> int rc = 0;
>
> /*
> * Ignore alignment since this is already going to be page aligned
> * and there's no need for any larger alignment.
> */
> - page = alloc_pages(GFP_KERNEL | __GFP_ZERO, order);
> - if (!page)
> + shm->kaddr = alloc_pages_exact(nr_pages * PAGE_SIZE,
> + GFP_KERNEL | __GFP_ZERO);
> + if (!shm->kaddr)
> return -ENOMEM;
>
> - shm->kaddr = page_address(page);
> - shm->paddr = page_to_phys(page);
> - shm->size = PAGE_SIZE << order;
> + shm->size = nr_pages * PAGE_SIZE;
> + shm->num_pages = nr_pages;
>
> - if (shm_register) {
> - unsigned int nr_pages = 1 << order, i;
> + /*
> + * If memory is registered immediately use a temporary page list
> + * and free it directly after the registration is completed.
> + *
> + * Else, if we have allocated more than one page store a page
> + * list in the struct tee_shm.
> + *
> + * Else, store the physical address of the single page that was
> + * allocated.
> + *
> + * optee_pool_op_free_helper() is responsible for freeing the
> + * resourses allocated in this function.
> + */
> + if (shm_register || nr_pages > 1) {
> struct page **pages;
>
> pages = kcalloc(nr_pages, sizeof(*pages), GFP_KERNEL);
> @@ -53,19 +65,26 @@ int optee_pool_op_alloc_helper(struct tee_shm_pool *pool, struct tee_shm *shm,
> }
>
> for (i = 0; i < nr_pages; i++)
> - pages[i] = page + i;
> -
> - rc = shm_register(shm->ctx, shm, pages, nr_pages,
> - (unsigned long)shm->kaddr);
> - kfree(pages);
> - if (rc)
> - goto err;
> + pages[i] = virt_to_page((u8 *)shm->kaddr +
> + i * PAGE_SIZE);
> +
> + if (shm_register) {
> + rc = shm_register(shm->ctx, shm, pages, nr_pages,
> + (unsigned long)shm->kaddr);
> + kfree(pages);
> + if (rc)
> + goto err;
> + } else {
> + shm->pages = pages;
> + }
> + } else {
> + shm->paddr = virt_to_phys(shm->kaddr);
> }
>
> return 0;
> -
> err:
> - free_pages((unsigned long)shm->kaddr, order);
> + free_pages_exact(shm->kaddr, shm->size);
> + shm->kaddr = NULL;
> return rc;
> }
>
> @@ -75,8 +94,10 @@ void optee_pool_op_free_helper(struct tee_shm_pool *pool, struct tee_shm *shm,
> {
> if (shm_unregister)
> shm_unregister(shm->ctx, shm);
> - free_pages((unsigned long)shm->kaddr, get_order(shm->size));
> + free_pages_exact(shm->kaddr, shm->size);
> shm->kaddr = NULL;
> + kfree(shm->pages);
> + shm->pages = NULL;
> }
>
> static void optee_bus_scan(struct work_struct *work)
> diff --git a/drivers/tee/optee/smc_abi.c b/drivers/tee/optee/smc_abi.c
> index d5b28fd35d66..b69410c7cc0a 100644
> --- a/drivers/tee/optee/smc_abi.c
> +++ b/drivers/tee/optee/smc_abi.c
> @@ -678,10 +678,11 @@ static void handle_rpc_func_cmd_shm_alloc(struct tee_context *ctx,
> struct optee_msg_arg *arg,
> struct optee_call_ctx *call_ctx)
> {
> - phys_addr_t pa;
> struct tee_shm *shm;
> size_t sz;
> size_t n;
> + struct page **pages;
> + size_t page_count;
>
> arg->ret_origin = TEEC_ORIGIN_COMMS;
>
> @@ -716,32 +717,23 @@ static void handle_rpc_func_cmd_shm_alloc(struct tee_context *ctx,
> return;
> }
>
> - if (tee_shm_get_pa(shm, 0, &pa)) {
> - arg->ret = TEEC_ERROR_BAD_PARAMETERS;
> - goto bad;
> - }
> -
> - sz = tee_shm_get_size(shm);
> -
> - if (tee_shm_is_dynamic(shm)) {
> - struct page **pages;
> + /*
> + * If there are pages it's dynamically allocated shared memory (not
> + * from the reserved shared memory pool) and needs to be
> + * registered.
> + */
> + pages = tee_shm_get_pages(shm, &page_count);
> + if (pages) {
> u64 *pages_list;
> - size_t page_num;
> -
> - pages = tee_shm_get_pages(shm, &page_num);
> - if (!pages || !page_num) {
> - arg->ret = TEEC_ERROR_OUT_OF_MEMORY;
> - goto bad;
> - }
>
> - pages_list = optee_allocate_pages_list(page_num);
> + pages_list = optee_allocate_pages_list(page_count);
> if (!pages_list) {
> arg->ret = TEEC_ERROR_OUT_OF_MEMORY;
> goto bad;
> }
>
> call_ctx->pages_list = pages_list;
> - call_ctx->num_entries = page_num;
> + call_ctx->num_entries = page_count;
>
> arg->params[0].attr = OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT |
> OPTEE_MSG_ATTR_NONCONTIG;
> @@ -752,17 +744,22 @@ static void handle_rpc_func_cmd_shm_alloc(struct tee_context *ctx,
> arg->params[0].u.tmem.buf_ptr = virt_to_phys(pages_list) |
> (tee_shm_get_page_offset(shm) &
> (OPTEE_MSG_NONCONTIG_PAGE_SIZE - 1));
> - arg->params[0].u.tmem.size = tee_shm_get_size(shm);
> - arg->params[0].u.tmem.shm_ref = (unsigned long)shm;
>
> - optee_fill_pages_list(pages_list, pages, page_num,
> + optee_fill_pages_list(pages_list, pages, page_count,
> tee_shm_get_page_offset(shm));
> } else {
> + phys_addr_t pa;
> +
> + if (tee_shm_get_pa(shm, 0, &pa)) {
> + arg->ret = TEEC_ERROR_BAD_PARAMETERS;
> + goto bad;
> + }
> +
> arg->params[0].attr = OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT;
> arg->params[0].u.tmem.buf_ptr = pa;
> - arg->params[0].u.tmem.size = sz;
> - arg->params[0].u.tmem.shm_ref = (unsigned long)shm;
> }
> + arg->params[0].u.tmem.size = tee_shm_get_size(shm);
> + arg->params[0].u.tmem.shm_ref = (unsigned long)shm;
>
> arg->ret = TEEC_SUCCESS;
> return;
>
> base-commit: 05d3ef8bba77c1b5f98d941d8b2d4aeab8118ef1
> --
> 2.34.1
>
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