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Message-ID: <CAFA6WYNW9-7gCZQSEaV=Gcr+GLdu25rQ8MpTg9yNpX7OwyZ0Tg@mail.gmail.com>
Date: Tue, 27 Feb 2024 11:36:47 +0530
From: Sumit Garg <sumit.garg@...aro.org>
To: Balint Dobszay <balint.dobszay@....com>
Cc: op-tee@...ts.trustedfirmware.org, linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
jens.wiklander@...aro.org, corbet@....net, sudeep.holla@....com,
rdunlap@...radead.org, krzk@...nel.org, gyorgy.szing@....com
Subject: Re: [PATCH v2 1/3] tee: optee: Move pool_op helper functions
Hi Balint,
On Fri, 23 Feb 2024 at 15:22, Balint Dobszay <balint.dobszay@....com> wrote:
>
> Move the pool alloc and free helper functions from the OP-TEE driver to
> the TEE subsystem, since these could be reused in other TEE drivers.
> This patch is not supposed to change behavior, it's only reorganizing
> the code.
>
> Suggested-by: Jens Wiklander <jens.wiklander@...aro.org>
> Signed-off-by: Balint Dobszay <balint.dobszay@....com>
> ---
> drivers/tee/optee/core.c | 64 ------------------------------
> drivers/tee/optee/ffa_abi.c | 6 +--
> drivers/tee/optee/optee_private.h | 12 ------
> drivers/tee/optee/smc_abi.c | 11 +++---
> drivers/tee/tee_shm.c | 65 +++++++++++++++++++++++++++++++
> include/linux/tee_drv.h | 11 ++++++
> 6 files changed, 85 insertions(+), 84 deletions(-)
>
> diff --git a/drivers/tee/optee/core.c b/drivers/tee/optee/core.c
> index 3aed554bc8d8..9390f21f9902 100644
> --- a/drivers/tee/optee/core.c
> +++ b/drivers/tee/optee/core.c
> @@ -9,7 +9,6 @@
> #include <linux/crash_dump.h>
> #include <linux/errno.h>
> #include <linux/io.h>
> -#include <linux/mm.h>
> #include <linux/module.h>
> #include <linux/slab.h>
> #include <linux/string.h>
> @@ -17,69 +16,6 @@
> #include <linux/types.h>
> #include "optee_private.h"
>
> -int optee_pool_op_alloc_helper(struct tee_shm_pool *pool, struct tee_shm *shm,
> - size_t size, size_t align,
> - int (*shm_register)(struct tee_context *ctx,
> - struct tee_shm *shm,
> - struct page **pages,
> - size_t num_pages,
> - unsigned long start))
> -{
> - size_t nr_pages = roundup(size, PAGE_SIZE) / PAGE_SIZE;
> - struct page **pages;
> - 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.
> - */
> - shm->kaddr = alloc_pages_exact(nr_pages * PAGE_SIZE,
> - GFP_KERNEL | __GFP_ZERO);
> - if (!shm->kaddr)
> - return -ENOMEM;
> -
> - shm->paddr = virt_to_phys(shm->kaddr);
> - shm->size = nr_pages * PAGE_SIZE;
> -
> - pages = kcalloc(nr_pages, sizeof(*pages), GFP_KERNEL);
> - if (!pages) {
> - rc = -ENOMEM;
> - goto err;
> - }
> -
> - for (i = 0; i < nr_pages; i++)
> - pages[i] = virt_to_page((u8 *)shm->kaddr + i * PAGE_SIZE);
> -
> - shm->pages = pages;
> - shm->num_pages = nr_pages;
> -
> - if (shm_register) {
> - rc = shm_register(shm->ctx, shm, pages, nr_pages,
> - (unsigned long)shm->kaddr);
> - if (rc)
> - goto err;
> - }
> -
> - return 0;
> -err:
> - free_pages_exact(shm->kaddr, shm->size);
> - shm->kaddr = NULL;
> - return rc;
> -}
> -
> -void optee_pool_op_free_helper(struct tee_shm_pool *pool, struct tee_shm *shm,
> - int (*shm_unregister)(struct tee_context *ctx,
> - struct tee_shm *shm))
> -{
> - if (shm_unregister)
> - shm_unregister(shm->ctx, shm);
> - 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)
> {
> WARN_ON(optee_enumerate_devices(PTA_CMD_GET_DEVICES_SUPP));
> diff --git a/drivers/tee/optee/ffa_abi.c b/drivers/tee/optee/ffa_abi.c
> index ecb5eb079408..ee11918a2b35 100644
> --- a/drivers/tee/optee/ffa_abi.c
> +++ b/drivers/tee/optee/ffa_abi.c
> @@ -374,14 +374,14 @@ static int optee_ffa_shm_unregister_supp(struct tee_context *ctx,
> static int pool_ffa_op_alloc(struct tee_shm_pool *pool,
> struct tee_shm *shm, size_t size, size_t align)
> {
> - return optee_pool_op_alloc_helper(pool, shm, size, align,
> - optee_ffa_shm_register);
> + return tee_shm_pool_op_alloc_helper(pool, shm, size, align,
> + optee_ffa_shm_register);
> }
>
> static void pool_ffa_op_free(struct tee_shm_pool *pool,
> struct tee_shm *shm)
> {
> - optee_pool_op_free_helper(pool, shm, optee_ffa_shm_unregister);
> + tee_shm_pool_op_free_helper(pool, shm, optee_ffa_shm_unregister);
> }
>
> static void pool_ffa_op_destroy_pool(struct tee_shm_pool *pool)
> diff --git a/drivers/tee/optee/optee_private.h b/drivers/tee/optee/optee_private.h
> index 7a5243c78b55..a153285a1919 100644
> --- a/drivers/tee/optee/optee_private.h
> +++ b/drivers/tee/optee/optee_private.h
> @@ -283,18 +283,6 @@ int optee_cancel_req(struct tee_context *ctx, u32 cancel_id, u32 session);
> int optee_enumerate_devices(u32 func);
> void optee_unregister_devices(void);
>
> -int optee_pool_op_alloc_helper(struct tee_shm_pool *pool, struct tee_shm *shm,
> - size_t size, size_t align,
> - int (*shm_register)(struct tee_context *ctx,
> - struct tee_shm *shm,
> - struct page **pages,
> - size_t num_pages,
> - unsigned long start));
> -void optee_pool_op_free_helper(struct tee_shm_pool *pool, struct tee_shm *shm,
> - int (*shm_unregister)(struct tee_context *ctx,
> - struct tee_shm *shm));
> -
> -
> void optee_remove_common(struct optee *optee);
> int optee_open(struct tee_context *ctx, bool cap_memref_null);
> void optee_release(struct tee_context *ctx);
> diff --git a/drivers/tee/optee/smc_abi.c b/drivers/tee/optee/smc_abi.c
> index a37f87087e5c..b0c616b6870d 100644
> --- a/drivers/tee/optee/smc_abi.c
> +++ b/drivers/tee/optee/smc_abi.c
> @@ -592,19 +592,20 @@ static int pool_op_alloc(struct tee_shm_pool *pool,
> * to be registered with OP-TEE.
> */
> if (shm->flags & TEE_SHM_PRIV)
> - return optee_pool_op_alloc_helper(pool, shm, size, align, NULL);
> + return tee_shm_pool_op_alloc_helper(pool, shm, size, align,
> + NULL);
>
> - return optee_pool_op_alloc_helper(pool, shm, size, align,
> - optee_shm_register);
> + return tee_shm_pool_op_alloc_helper(pool, shm, size, align,
> + optee_shm_register);
> }
>
> static void pool_op_free(struct tee_shm_pool *pool,
> struct tee_shm *shm)
> {
> if (!(shm->flags & TEE_SHM_PRIV))
> - optee_pool_op_free_helper(pool, shm, optee_shm_unregister);
> + tee_shm_pool_op_free_helper(pool, shm, optee_shm_unregister);
> else
> - optee_pool_op_free_helper(pool, shm, NULL);
> + tee_shm_pool_op_free_helper(pool, shm, NULL);
> }
>
> static void pool_op_destroy_pool(struct tee_shm_pool *pool)
> diff --git a/drivers/tee/tee_shm.c b/drivers/tee/tee_shm.c
> index 731d9028b67f..641aad92ffe2 100644
> --- a/drivers/tee/tee_shm.c
> +++ b/drivers/tee/tee_shm.c
> @@ -202,6 +202,71 @@ struct tee_shm *tee_shm_alloc_priv_buf(struct tee_context *ctx, size_t size)
> }
> EXPORT_SYMBOL_GPL(tee_shm_alloc_priv_buf);
>
> +int tee_shm_pool_op_alloc_helper(struct tee_shm_pool *pool, struct tee_shm *shm,
I don't see the first argument (struct tee_shm_pool *pool) being used,
so drop that. Also, we can just rename it as
tee_dyn_shm_alloc_helper().
> + size_t size, size_t align,
> + int (*shm_register)(struct tee_context *ctx,
> + struct tee_shm *shm,
> + struct page **pages,
> + size_t num_pages,
> + unsigned long start))
> +{
> + size_t nr_pages = roundup(size, PAGE_SIZE) / PAGE_SIZE;
> + struct page **pages;
> + 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.
> + */
> + shm->kaddr = alloc_pages_exact(nr_pages * PAGE_SIZE,
> + GFP_KERNEL | __GFP_ZERO);
> + if (!shm->kaddr)
> + return -ENOMEM;
> +
> + shm->paddr = virt_to_phys(shm->kaddr);
> + shm->size = nr_pages * PAGE_SIZE;
> +
> + pages = kcalloc(nr_pages, sizeof(*pages), GFP_KERNEL);
> + if (!pages) {
> + rc = -ENOMEM;
> + goto err;
> + }
> +
> + for (i = 0; i < nr_pages; i++)
> + pages[i] = virt_to_page((u8 *)shm->kaddr + i * PAGE_SIZE);
> +
> + shm->pages = pages;
> + shm->num_pages = nr_pages;
> +
> + if (shm_register) {
> + rc = shm_register(shm->ctx, shm, pages, nr_pages,
> + (unsigned long)shm->kaddr);
> + if (rc)
> + goto err;
> + }
> +
> + return 0;
> +err:
> + free_pages_exact(shm->kaddr, shm->size);
> + shm->kaddr = NULL;
> + return rc;
> +}
> +EXPORT_SYMBOL_GPL(tee_shm_pool_op_alloc_helper);
> +
> +void tee_shm_pool_op_free_helper(struct tee_shm_pool *pool, struct tee_shm *shm,
Ditto tee_shm_pool_op_free_helper() -> tee_dyn_shm_free_helper()
> + int (*shm_unregister)(struct tee_context *ctx,
> + struct tee_shm *shm))
> +{
> + if (shm_unregister)
> + shm_unregister(shm->ctx, shm);
> + free_pages_exact(shm->kaddr, shm->size);
> + shm->kaddr = NULL;
> + kfree(shm->pages);
> + shm->pages = NULL;
> +}
> +EXPORT_SYMBOL_GPL(tee_shm_pool_op_free_helper);
> +
> static struct tee_shm *
> register_shm_helper(struct tee_context *ctx, struct iov_iter *iter, u32 flags,
> int id)
> diff --git a/include/linux/tee_drv.h b/include/linux/tee_drv.h
> index 911ddf92dcee..4cf402424e71 100644
> --- a/include/linux/tee_drv.h
> +++ b/include/linux/tee_drv.h
> @@ -275,6 +275,17 @@ void *tee_get_drvdata(struct tee_device *teedev);
> struct tee_shm *tee_shm_alloc_priv_buf(struct tee_context *ctx, size_t size);
> struct tee_shm *tee_shm_alloc_kernel_buf(struct tee_context *ctx, size_t size);
>
> +int tee_shm_pool_op_alloc_helper(struct tee_shm_pool *pool, struct tee_shm *shm,
> + size_t size, size_t align,
> + int (*shm_register)(struct tee_context *ctx,
> + struct tee_shm *shm,
> + struct page **pages,
> + size_t num_pages,
> + unsigned long start));
> +void tee_shm_pool_op_free_helper(struct tee_shm_pool *pool, struct tee_shm *shm,
> + int (*shm_unregister)(struct tee_context *ctx,
> + struct tee_shm *shm));
> +
These rather belong to drivers/tee/tee_private.h as we shouldn't
expose them to other kernel client drivers.
-Sumit
> struct tee_shm *tee_shm_register_kernel_buf(struct tee_context *ctx,
> void *addr, size_t length);
>
> --
> 2.34.1
>
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