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Message-ID: <CAHUa44GWn+yk2aU-MMKnc+Sa3R12gE=zwS-3sgvTLV7gfNm-zg@mail.gmail.com>
Date: Fri, 21 Jan 2022 14:47:09 +0100
From: Jens Wiklander <jens.wiklander@...aro.org>
To: Sumit Garg <sumit.garg@...aro.org>
Cc: linux-kernel@...r.kernel.org, op-tee@...ts.trustedfirmware.org,
Herbert Xu <herbert@...dor.apana.org.au>,
Devaraj Rangasamy <Devaraj.Rangasamy@....com>,
Rijo Thomas <Rijo-john.Thomas@....com>,
David Howells <dhowells@...hat.com>,
Tyler Hicks <tyhicks@...ux.microsoft.com>
Subject: Re: [PATCH v2 04/12] tee: simplify shm pool handling
On Fri, Jan 21, 2022 at 2:06 PM Sumit Garg <sumit.garg@...aro.org> wrote:
>
> On Thu, 20 Jan 2022 at 18:26, Jens Wiklander <jens.wiklander@...aro.org> wrote:
> >
> > On Thu, Jan 20, 2022 at 03:36:45PM +0530, Sumit Garg wrote:
> > > Hi Jens,
> > >
> > > Thanks for this cleanup.
> > >
> > > On Fri, 14 Jan 2022 at 20:38, Jens Wiklander <jens.wiklander@...aro.org> wrote:
> > > >
> > > > Replaces the shared memory pool based on two pools with a single pool.
> > > > The alloc() function pointer in struct tee_shm_pool_ops gets another
> > > > parameter, align. This makes it possible to make less than page aligned
> > > > allocations from the optional reserved shared memory pool while still
> > > > making user space allocations page aligned. With in practice unchanged
> > > > behaviour using only a single pool for bookkeeping.
> > > >
> > > > The allocation algorithm in the static OP-TEE shared memory pool is
> > > > changed from best-fit to first-fit since only the latter supports an
> > > > alignment parameter. The best-fit algorithm was previously the default
> > > > choice and not a concious one.
> > >
> > > typo: s/concious/conscious/
> >
> > Thanks
> >
> > >
> > > AFAIU, the earlier design was to keep separate pools for differently
> > > aligned memory allocation (one for 8 bytes aligned, other for
> > > PAGE_SIZE aligned). But after this patch we would be mixing these
> > > allocations using a first-fit algorithm. Don't you think that it would
> > > lead to inefficient memory allocation (fragmentation) as compared to
> > > existing one?
> >
> > These small private allocation are expected to be rather short lived
> > so if there is fragmentation it will typically we restricted to the first
> > pages.
> >
> > >
> > > I think we need to be careful about allocation strategy for static
> > > shared memory as it's a constrained resource and if a particular
> > > device is using this approach then a kernel upgrade shouldn't cause
> > > any regressions for that device.
> >
> > A typical OP-TEE private shm allocation is 224 bytes (argument struct
> > with 6 parameters, needed for open session). So with an alignment of 512
> > well waste a bit more than 50%. Before this we had a single page
> > reserved for this so worst case usage compared to that would be 3 pages
> > instead of 1 page. However, this worst case only occurs if there is a
> > high preassure from multiple threads on secure world. All in all I
> > believe this scales up and down better than fixed boundaries.
> >
> > I was chosing somewhat large alignment to avoid increasing it again. I
> > have some patches in the pipe which will grow the typicall private shm
> > allocation to a page at a time which then will be used for multiple
> > argument structs at a time.
> >
>
> Thanks for the details. Can we have this included in the commit
> message as well as in the code itself as comment for minimum alignment
> as 512 bytes for future reference?
>
> /*
> * <above description>
> */
> OPTEE_MIN_STATIC_POOL_ALIGN 9 /* 512 bytes aligned */
I'll add something.
Thanks,
Jens
>
> -Sumit
>
> >
> > >
> > > >
> > > > The optee and amdtee drivers are updated as needed to work with this
> > > > changed pool handling.
> > > >
> > > > This also removes OPTEE_SHM_NUM_PRIV_PAGES which becomes obsolete with
> > > > this change as the private pages can be mixed with the payload pages.
> > > >
> > > > Signed-off-by: Jens Wiklander <jens.wiklander@...aro.org>
> > > > ---
> > > > drivers/tee/amdtee/shm_pool.c | 55 +++++-----------
> > > > drivers/tee/optee/Kconfig | 8 ---
> > > > drivers/tee/optee/core.c | 11 ++--
> > > > drivers/tee/optee/ffa_abi.c | 55 ++++------------
> > > > drivers/tee/optee/optee_private.h | 4 +-
> > > > drivers/tee/optee/smc_abi.c | 100 ++++++----------------------
> > > > drivers/tee/tee_private.h | 11 ----
> > > > drivers/tee/tee_shm.c | 29 ++++-----
> > > > drivers/tee/tee_shm_pool.c | 104 ++++++++++--------------------
> > > > include/linux/tee_drv.h | 58 ++++++-----------
> > > > 10 files changed, 126 insertions(+), 309 deletions(-)
> > > >
> > > > diff --git a/drivers/tee/amdtee/shm_pool.c b/drivers/tee/amdtee/shm_pool.c
> > > > index 065854e2db18..f87f96a291c9 100644
> > > > --- a/drivers/tee/amdtee/shm_pool.c
> > > > +++ b/drivers/tee/amdtee/shm_pool.c
> > > > @@ -8,13 +8,17 @@
> > > > #include <linux/psp-sev.h>
> > > > #include "amdtee_private.h"
> > > >
> > > > -static int pool_op_alloc(struct tee_shm_pool_mgr *poolm, struct tee_shm *shm,
> > > > - size_t size)
> > > > +static int pool_op_alloc(struct tee_shm_pool *pool, struct tee_shm *shm,
> > > > + size_t size, size_t align)
> > > > {
> > > > unsigned int order = get_order(size);
> > > > unsigned long va;
> > > > int rc;
> > > >
> > > > + /*
> > > > + * Ignore alignment since this is already going to be page aligned
> > > > + * and there's no need for any larger alignment.
> > > > + */
> > > > va = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
> > > > if (!va)
> > > > return -ENOMEM;
> > > > @@ -34,7 +38,7 @@ static int pool_op_alloc(struct tee_shm_pool_mgr *poolm, struct tee_shm *shm,
> > > > return 0;
> > > > }
> > > >
> > > > -static void pool_op_free(struct tee_shm_pool_mgr *poolm, struct tee_shm *shm)
> > > > +static void pool_op_free(struct tee_shm_pool *pool, struct tee_shm *shm)
> > > > {
> > > > /* Unmap the shared memory from TEE */
> > > > amdtee_unmap_shmem(shm);
> > > > @@ -42,52 +46,25 @@ static void pool_op_free(struct tee_shm_pool_mgr *poolm, struct tee_shm *shm)
> > > > shm->kaddr = NULL;
> > > > }
> > > >
> > > > -static void pool_op_destroy_poolmgr(struct tee_shm_pool_mgr *poolm)
> > > > +static void pool_op_destroy_pool(struct tee_shm_pool *pool)
> > > > {
> > > > - kfree(poolm);
> > > > + kfree(pool);
> > > > }
> > > >
> > > > -static const struct tee_shm_pool_mgr_ops pool_ops = {
> > > > +static const struct tee_shm_pool_ops pool_ops = {
> > > > .alloc = pool_op_alloc,
> > > > .free = pool_op_free,
> > > > - .destroy_poolmgr = pool_op_destroy_poolmgr,
> > > > + .destroy_pool = pool_op_destroy_pool,
> > > > };
> > > >
> > > > -static struct tee_shm_pool_mgr *pool_mem_mgr_alloc(void)
> > > > -{
> > > > - struct tee_shm_pool_mgr *mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
> > > > -
> > > > - if (!mgr)
> > > > - return ERR_PTR(-ENOMEM);
> > > > -
> > > > - mgr->ops = &pool_ops;
> > > > -
> > > > - return mgr;
> > > > -}
> > > > -
> > > > struct tee_shm_pool *amdtee_config_shm(void)
> > > > {
> > > > - struct tee_shm_pool_mgr *priv_mgr;
> > > > - struct tee_shm_pool_mgr *dmabuf_mgr;
> > > > - void *rc;
> > > > + struct tee_shm_pool *pool = kzalloc(sizeof(*pool), GFP_KERNEL);
> > > >
> > > > - rc = pool_mem_mgr_alloc();
> > > > - if (IS_ERR(rc))
> > > > - return rc;
> > > > - priv_mgr = rc;
> > > > -
> > > > - rc = pool_mem_mgr_alloc();
> > > > - if (IS_ERR(rc)) {
> > > > - tee_shm_pool_mgr_destroy(priv_mgr);
> > > > - return rc;
> > > > - }
> > > > - dmabuf_mgr = rc;
> > > > + if (!pool)
> > > > + return ERR_PTR(-ENOMEM);
> > > >
> > > > - rc = tee_shm_pool_alloc(priv_mgr, dmabuf_mgr);
> > > > - if (IS_ERR(rc)) {
> > > > - tee_shm_pool_mgr_destroy(priv_mgr);
> > > > - tee_shm_pool_mgr_destroy(dmabuf_mgr);
> > > > - }
> > > > + pool->ops = &pool_ops;
> > > >
> > > > - return rc;
> > > > + return pool;
> > > > }
> > > > diff --git a/drivers/tee/optee/Kconfig b/drivers/tee/optee/Kconfig
> > > > index 3ca71e3812ed..f121c224e682 100644
> > > > --- a/drivers/tee/optee/Kconfig
> > > > +++ b/drivers/tee/optee/Kconfig
> > > > @@ -7,11 +7,3 @@ config OPTEE
> > > > help
> > > > This implements the OP-TEE Trusted Execution Environment (TEE)
> > > > driver.
> > > > -
> > > > -config OPTEE_SHM_NUM_PRIV_PAGES
> > > > - int "Private Shared Memory Pages"
> > > > - default 1
> > > > - depends on OPTEE
> > > > - help
> > > > - This sets the number of private shared memory pages to be
> > > > - used by OP-TEE TEE driver.
> > > > diff --git a/drivers/tee/optee/core.c b/drivers/tee/optee/core.c
> > > > index 1ca320885fad..2a369e346b85 100644
> > > > --- a/drivers/tee/optee/core.c
> > > > +++ b/drivers/tee/optee/core.c
> > > > @@ -18,8 +18,8 @@
> > > > #include <linux/workqueue.h>
> > > > #include "optee_private.h"
> > > >
> > > > -int optee_pool_op_alloc_helper(struct tee_shm_pool_mgr *poolm,
> > > > - struct tee_shm *shm, size_t size,
> > > > +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,
> > > > @@ -30,6 +30,10 @@ int optee_pool_op_alloc_helper(struct tee_shm_pool_mgr *poolm,
> > > > struct page *page;
> > > > 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)
> > > > return -ENOMEM;
> > > > @@ -51,7 +55,6 @@ int optee_pool_op_alloc_helper(struct tee_shm_pool_mgr *poolm,
> > > > for (i = 0; i < nr_pages; i++)
> > > > pages[i] = page + i;
> > > >
> > > > - shm->flags |= TEE_SHM_REGISTER;
> > > > rc = shm_register(shm->ctx, shm, pages, nr_pages,
> > > > (unsigned long)shm->kaddr);
> > > > kfree(pages);
> > > > @@ -62,7 +65,7 @@ int optee_pool_op_alloc_helper(struct tee_shm_pool_mgr *poolm,
> > > > return 0;
> > > >
> > > > err:
> > > > - __free_pages(page, order);
> > > > + free_pages((unsigned long)shm->kaddr, order);
> > > > return rc;
> > > > }
> > > >
> > > > diff --git a/drivers/tee/optee/ffa_abi.c b/drivers/tee/optee/ffa_abi.c
> > > > index 20a1b1a3d965..e690d9420966 100644
> > > > --- a/drivers/tee/optee/ffa_abi.c
> > > > +++ b/drivers/tee/optee/ffa_abi.c
> > > > @@ -369,14 +369,14 @@ static int optee_ffa_shm_unregister_supp(struct tee_context *ctx,
> > > > * The main function is optee_ffa_shm_pool_alloc_pages().
> > > > */
> > > >
> > > > -static int pool_ffa_op_alloc(struct tee_shm_pool_mgr *poolm,
> > > > - struct tee_shm *shm, size_t size)
> > > > +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(poolm, shm, size,
> > > > + return optee_pool_op_alloc_helper(pool, shm, size, align,
> > > > optee_ffa_shm_register);
> > > > }
> > > >
> > > > -static void pool_ffa_op_free(struct tee_shm_pool_mgr *poolm,
> > > > +static void pool_ffa_op_free(struct tee_shm_pool *pool,
> > > > struct tee_shm *shm)
> > > > {
> > > > optee_ffa_shm_unregister(shm->ctx, shm);
> > > > @@ -384,15 +384,15 @@ static void pool_ffa_op_free(struct tee_shm_pool_mgr *poolm,
> > > > shm->kaddr = NULL;
> > > > }
> > > >
> > > > -static void pool_ffa_op_destroy_poolmgr(struct tee_shm_pool_mgr *poolm)
> > > > +static void pool_ffa_op_destroy_pool(struct tee_shm_pool *pool)
> > > > {
> > > > - kfree(poolm);
> > > > + kfree(pool);
> > > > }
> > > >
> > > > -static const struct tee_shm_pool_mgr_ops pool_ffa_ops = {
> > > > +static const struct tee_shm_pool_ops pool_ffa_ops = {
> > > > .alloc = pool_ffa_op_alloc,
> > > > .free = pool_ffa_op_free,
> > > > - .destroy_poolmgr = pool_ffa_op_destroy_poolmgr,
> > > > + .destroy_pool = pool_ffa_op_destroy_pool,
> > > > };
> > > >
> > > > /**
> > > > @@ -401,16 +401,16 @@ static const struct tee_shm_pool_mgr_ops pool_ffa_ops = {
> > > > * This pool is used with OP-TEE over FF-A. In this case command buffers
> > > > * and such are allocated from kernel's own memory.
> > > > */
> > > > -static struct tee_shm_pool_mgr *optee_ffa_shm_pool_alloc_pages(void)
> > > > +static struct tee_shm_pool *optee_ffa_shm_pool_alloc_pages(void)
> > > > {
> > > > - struct tee_shm_pool_mgr *mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
> > > > + struct tee_shm_pool *pool = kzalloc(sizeof(*pool), GFP_KERNEL);
> > > >
> > > > - if (!mgr)
> > > > + if (!pool)
> > > > return ERR_PTR(-ENOMEM);
> > > >
> > > > - mgr->ops = &pool_ffa_ops;
> > > > + pool->ops = &pool_ffa_ops;
> > > >
> > > > - return mgr;
> > > > + return pool;
> > > > }
> > > >
> > > > /*
> > > > @@ -691,33 +691,6 @@ static bool optee_ffa_exchange_caps(struct ffa_device *ffa_dev,
> > > > return true;
> > > > }
> > > >
> > > > -static struct tee_shm_pool *optee_ffa_config_dyn_shm(void)
> > > > -{
> > > > - struct tee_shm_pool_mgr *priv_mgr;
> > > > - struct tee_shm_pool_mgr *dmabuf_mgr;
> > > > - void *rc;
> > > > -
> > > > - rc = optee_ffa_shm_pool_alloc_pages();
> > > > - if (IS_ERR(rc))
> > > > - return rc;
> > > > - priv_mgr = rc;
> > > > -
> > > > - rc = optee_ffa_shm_pool_alloc_pages();
> > > > - if (IS_ERR(rc)) {
> > > > - tee_shm_pool_mgr_destroy(priv_mgr);
> > > > - return rc;
> > > > - }
> > > > - dmabuf_mgr = rc;
> > > > -
> > > > - rc = tee_shm_pool_alloc(priv_mgr, dmabuf_mgr);
> > > > - if (IS_ERR(rc)) {
> > > > - tee_shm_pool_mgr_destroy(priv_mgr);
> > > > - tee_shm_pool_mgr_destroy(dmabuf_mgr);
> > > > - }
> > > > -
> > > > - return rc;
> > > > -}
> > > > -
> > > > static void optee_ffa_get_version(struct tee_device *teedev,
> > > > struct tee_ioctl_version_data *vers)
> > > > {
> > > > @@ -813,7 +786,7 @@ static int optee_ffa_probe(struct ffa_device *ffa_dev)
> > > > if (!optee)
> > > > return -ENOMEM;
> > > >
> > > > - optee->pool = optee_ffa_config_dyn_shm();
> > > > + optee->pool = optee_ffa_shm_pool_alloc_pages();
> > > > if (IS_ERR(optee->pool)) {
> > > > rc = PTR_ERR(optee->pool);
> > > > optee->pool = NULL;
> > > > diff --git a/drivers/tee/optee/optee_private.h b/drivers/tee/optee/optee_private.h
> > > > index 46f74ab07c7e..df2450921464 100644
> > > > --- a/drivers/tee/optee/optee_private.h
> > > > +++ b/drivers/tee/optee/optee_private.h
> > > > @@ -228,8 +228,8 @@ 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_mgr *poolm,
> > > > - struct tee_shm *shm, size_t size,
> > > > +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,
> > > > diff --git a/drivers/tee/optee/smc_abi.c b/drivers/tee/optee/smc_abi.c
> > > > index 449d6a72d289..b679037ea794 100644
> > > > --- a/drivers/tee/optee/smc_abi.c
> > > > +++ b/drivers/tee/optee/smc_abi.c
> > > > @@ -42,8 +42,6 @@
> > > > * 6. Driver initialization.
> > > > */
> > > >
> > > > -#define OPTEE_SHM_NUM_PRIV_PAGES CONFIG_OPTEE_SHM_NUM_PRIV_PAGES
> > > > -
> > > > /*
> > > > * 1. Convert between struct tee_param and struct optee_msg_param
> > > > *
> > > > @@ -532,20 +530,21 @@ static int optee_shm_unregister_supp(struct tee_context *ctx,
> > > > * The main function is optee_shm_pool_alloc_pages().
> > > > */
> > > >
> > > > -static int pool_op_alloc(struct tee_shm_pool_mgr *poolm,
> > > > - struct tee_shm *shm, size_t size)
> > > > +static int pool_op_alloc(struct tee_shm_pool *pool,
> > > > + struct tee_shm *shm, size_t size, size_t align)
> > > > {
> > > > /*
> > > > * Shared memory private to the OP-TEE driver doesn't need
> > > > * to be registered with OP-TEE.
> > > > */
> > > > if (shm->flags & TEE_SHM_PRIV)
> > > > - return optee_pool_op_alloc_helper(poolm, shm, size, NULL);
> > > > + return optee_pool_op_alloc_helper(pool, shm, size, align, NULL);
> > > >
> > > > - return optee_pool_op_alloc_helper(poolm, shm, size, optee_shm_register);
> > > > + return optee_pool_op_alloc_helper(pool, shm, size, align,
> > > > + optee_shm_register);
> > > > }
> > > >
> > > > -static void pool_op_free(struct tee_shm_pool_mgr *poolm,
> > > > +static void pool_op_free(struct tee_shm_pool *pool,
> > > > struct tee_shm *shm)
> > > > {
> > > > if (!(shm->flags & TEE_SHM_PRIV))
> > > > @@ -555,15 +554,15 @@ static void pool_op_free(struct tee_shm_pool_mgr *poolm,
> > > > shm->kaddr = NULL;
> > > > }
> > > >
> > > > -static void pool_op_destroy_poolmgr(struct tee_shm_pool_mgr *poolm)
> > > > +static void pool_op_destroy_pool(struct tee_shm_pool *pool)
> > > > {
> > > > - kfree(poolm);
> > > > + kfree(pool);
> > > > }
> > > >
> > > > -static const struct tee_shm_pool_mgr_ops pool_ops = {
> > > > +static const struct tee_shm_pool_ops pool_ops = {
> > > > .alloc = pool_op_alloc,
> > > > .free = pool_op_free,
> > > > - .destroy_poolmgr = pool_op_destroy_poolmgr,
> > > > + .destroy_pool = pool_op_destroy_pool,
> > > > };
> > > >
> > > > /**
> > > > @@ -572,16 +571,16 @@ static const struct tee_shm_pool_mgr_ops pool_ops = {
> > > > * This pool is used when OP-TEE supports dymanic SHM. In this case
> > > > * command buffers and such are allocated from kernel's own memory.
> > > > */
> > > > -static struct tee_shm_pool_mgr *optee_shm_pool_alloc_pages(void)
> > > > +static struct tee_shm_pool *optee_shm_pool_alloc_pages(void)
> > > > {
> > > > - struct tee_shm_pool_mgr *mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
> > > > + struct tee_shm_pool *pool = kzalloc(sizeof(*pool), GFP_KERNEL);
> > > >
> > > > - if (!mgr)
> > > > + if (!pool)
> > > > return ERR_PTR(-ENOMEM);
> > > >
> > > > - mgr->ops = &pool_ops;
> > > > + pool->ops = &pool_ops;
> > > >
> > > > - return mgr;
> > > > + return pool;
> > > > }
> > > >
> > > > /*
> > > > @@ -1174,33 +1173,6 @@ static bool optee_msg_exchange_capabilities(optee_invoke_fn *invoke_fn,
> > > > return true;
> > > > }
> > > >
> > > > -static struct tee_shm_pool *optee_config_dyn_shm(void)
> > > > -{
> > > > - struct tee_shm_pool_mgr *priv_mgr;
> > > > - struct tee_shm_pool_mgr *dmabuf_mgr;
> > > > - void *rc;
> > > > -
> > > > - rc = optee_shm_pool_alloc_pages();
> > > > - if (IS_ERR(rc))
> > > > - return rc;
> > > > - priv_mgr = rc;
> > > > -
> > > > - rc = optee_shm_pool_alloc_pages();
> > > > - if (IS_ERR(rc)) {
> > > > - tee_shm_pool_mgr_destroy(priv_mgr);
> > > > - return rc;
> > > > - }
> > > > - dmabuf_mgr = rc;
> > > > -
> > > > - rc = tee_shm_pool_alloc(priv_mgr, dmabuf_mgr);
> > > > - if (IS_ERR(rc)) {
> > > > - tee_shm_pool_mgr_destroy(priv_mgr);
> > > > - tee_shm_pool_mgr_destroy(dmabuf_mgr);
> > > > - }
> > > > -
> > > > - return rc;
> > > > -}
> > > > -
> > > > static struct tee_shm_pool *
> > > > optee_config_shm_memremap(optee_invoke_fn *invoke_fn, void **memremaped_shm)
> > > > {
> > > > @@ -1214,10 +1186,7 @@ optee_config_shm_memremap(optee_invoke_fn *invoke_fn, void **memremaped_shm)
> > > > phys_addr_t begin;
> > > > phys_addr_t end;
> > > > void *va;
> > > > - struct tee_shm_pool_mgr *priv_mgr;
> > > > - struct tee_shm_pool_mgr *dmabuf_mgr;
> > > > void *rc;
> > > > - const int sz = OPTEE_SHM_NUM_PRIV_PAGES * PAGE_SIZE;
> > > >
> > > > invoke_fn(OPTEE_SMC_GET_SHM_CONFIG, 0, 0, 0, 0, 0, 0, 0, &res.smccc);
> > > > if (res.result.status != OPTEE_SMC_RETURN_OK) {
> > > > @@ -1235,11 +1204,6 @@ optee_config_shm_memremap(optee_invoke_fn *invoke_fn, void **memremaped_shm)
> > > > paddr = begin;
> > > > size = end - begin;
> > > >
> > > > - if (size < 2 * OPTEE_SHM_NUM_PRIV_PAGES * PAGE_SIZE) {
> > > > - pr_err("too small shared memory area\n");
> > > > - return ERR_PTR(-EINVAL);
> > > > - }
> > > > -
> > > > va = memremap(paddr, size, MEMREMAP_WB);
> > > > if (!va) {
> > > > pr_err("shared memory ioremap failed\n");
> > > > @@ -1247,35 +1211,13 @@ optee_config_shm_memremap(optee_invoke_fn *invoke_fn, void **memremaped_shm)
> > > > }
> > > > vaddr = (unsigned long)va;
> > > >
> > > > - rc = tee_shm_pool_mgr_alloc_res_mem(vaddr, paddr, sz,
> > > > - 3 /* 8 bytes aligned */);
> > > > - if (IS_ERR(rc))
> > > > - goto err_memunmap;
> > > > - priv_mgr = rc;
> > > > -
> > > > - vaddr += sz;
> > > > - paddr += sz;
> > > > - size -= sz;
> > > > -
> > > > - rc = tee_shm_pool_mgr_alloc_res_mem(vaddr, paddr, size, PAGE_SHIFT);
> > > > + rc = tee_shm_pool_alloc_res_mem(vaddr, paddr, size,
> > > > + 9 /* 512 bytes aligned */);
> > >
> > > Here you are specifying minimal allocation alignment to be 512 bytes?
> > > Wouldn't it be inefficient corresponding to 8 bytes aligned OP-TEE
> > > private memory allocation earlier?
> >
> > I hope I've been able to address this above.
> >
> > Thanks,
> > Jens
> >
> > >
> > > -Sumit
> > >
> > > > if (IS_ERR(rc))
> > > > - goto err_free_priv_mgr;
> > > > - dmabuf_mgr = rc;
> > > > -
> > > > - rc = tee_shm_pool_alloc(priv_mgr, dmabuf_mgr);
> > > > - if (IS_ERR(rc))
> > > > - goto err_free_dmabuf_mgr;
> > > > -
> > > > - *memremaped_shm = va;
> > > > -
> > > > - return rc;
> > > > + memunmap(va);
> > > > + else
> > > > + *memremaped_shm = va;
> > > >
> > > > -err_free_dmabuf_mgr:
> > > > - tee_shm_pool_mgr_destroy(dmabuf_mgr);
> > > > -err_free_priv_mgr:
> > > > - tee_shm_pool_mgr_destroy(priv_mgr);
> > > > -err_memunmap:
> > > > - memunmap(va);
> > > > return rc;
> > > > }
> > > >
> > > > @@ -1396,7 +1338,7 @@ static int optee_probe(struct platform_device *pdev)
> > > > * Try to use dynamic shared memory if possible
> > > > */
> > > > if (sec_caps & OPTEE_SMC_SEC_CAP_DYNAMIC_SHM)
> > > > - pool = optee_config_dyn_shm();
> > > > + pool = optee_shm_pool_alloc_pages();
> > > >
> > > > /*
> > > > * If dynamic shared memory is not available or failed - try static one
> > > > diff --git a/drivers/tee/tee_private.h b/drivers/tee/tee_private.h
> > > > index e55204df31ce..72376cf38bc0 100644
> > > > --- a/drivers/tee/tee_private.h
> > > > +++ b/drivers/tee/tee_private.h
> > > > @@ -12,17 +12,6 @@
> > > > #include <linux/mutex.h>
> > > > #include <linux/types.h>
> > > >
> > > > -/**
> > > > - * struct tee_shm_pool - shared memory pool
> > > > - * @private_mgr: pool manager for shared memory only between kernel
> > > > - * and secure world
> > > > - * @dma_buf_mgr: pool manager for shared memory exported to user space
> > > > - */
> > > > -struct tee_shm_pool {
> > > > - struct tee_shm_pool_mgr *private_mgr;
> > > > - struct tee_shm_pool_mgr *dma_buf_mgr;
> > > > -};
> > > > -
> > > > #define TEE_DEVICE_FLAG_REGISTERED 0x1
> > > > #define TEE_MAX_DEV_NAME_LEN 32
> > > >
> > > > diff --git a/drivers/tee/tee_shm.c b/drivers/tee/tee_shm.c
> > > > index b43178986985..2c8ce0c6801a 100644
> > > > --- a/drivers/tee/tee_shm.c
> > > > +++ b/drivers/tee/tee_shm.c
> > > > @@ -31,14 +31,7 @@ static void release_registered_pages(struct tee_shm *shm)
> > > > static void tee_shm_release(struct tee_device *teedev, struct tee_shm *shm)
> > > > {
> > > > if (shm->flags & TEE_SHM_POOL) {
> > > > - struct tee_shm_pool_mgr *poolm;
> > > > -
> > > > - if (shm->flags & TEE_SHM_DMA_BUF)
> > > > - poolm = teedev->pool->dma_buf_mgr;
> > > > - else
> > > > - poolm = teedev->pool->private_mgr;
> > > > -
> > > > - poolm->ops->free(poolm, shm);
> > > > + teedev->pool->ops->free(teedev->pool, shm);
> > > > } else if (shm->flags & TEE_SHM_REGISTER) {
> > > > int rc = teedev->desc->ops->shm_unregister(shm->ctx, shm);
> > > >
> > > > @@ -59,8 +52,8 @@ static void tee_shm_release(struct tee_device *teedev, struct tee_shm *shm)
> > > > struct tee_shm *tee_shm_alloc(struct tee_context *ctx, size_t size, u32 flags)
> > > > {
> > > > struct tee_device *teedev = ctx->teedev;
> > > > - struct tee_shm_pool_mgr *poolm = NULL;
> > > > struct tee_shm *shm;
> > > > + size_t align;
> > > > void *ret;
> > > > int rc;
> > > >
> > > > @@ -93,12 +86,18 @@ struct tee_shm *tee_shm_alloc(struct tee_context *ctx, size_t size, u32 flags)
> > > > refcount_set(&shm->refcount, 1);
> > > > shm->flags = flags | TEE_SHM_POOL;
> > > > shm->ctx = ctx;
> > > > - if (flags & TEE_SHM_DMA_BUF)
> > > > - poolm = teedev->pool->dma_buf_mgr;
> > > > - else
> > > > - poolm = teedev->pool->private_mgr;
> > > > + if (flags & TEE_SHM_DMA_BUF) {
> > > > + align = PAGE_SIZE;
> > > > + /*
> > > > + * Request to register the shm in the pool allocator below
> > > > + * if supported.
> > > > + */
> > > > + shm->flags |= TEE_SHM_REGISTER;
> > > > + } else {
> > > > + align = 2 * sizeof(long);
> > > > + }
> > > >
> > > > - rc = poolm->ops->alloc(poolm, shm, size);
> > > > + rc = teedev->pool->ops->alloc(teedev->pool, shm, size, align);
> > > > if (rc) {
> > > > ret = ERR_PTR(rc);
> > > > goto err_kfree;
> > > > @@ -118,7 +117,7 @@ struct tee_shm *tee_shm_alloc(struct tee_context *ctx, size_t size, u32 flags)
> > > >
> > > > return shm;
> > > > err_pool_free:
> > > > - poolm->ops->free(poolm, shm);
> > > > + teedev->pool->ops->free(teedev->pool, shm);
> > > > err_kfree:
> > > > kfree(shm);
> > > > err_dev_put:
> > > > diff --git a/drivers/tee/tee_shm_pool.c b/drivers/tee/tee_shm_pool.c
> > > > index 0e460347138a..71e0f8ae69aa 100644
> > > > --- a/drivers/tee/tee_shm_pool.c
> > > > +++ b/drivers/tee/tee_shm_pool.c
> > > > @@ -9,14 +9,16 @@
> > > > #include <linux/tee_drv.h>
> > > > #include "tee_private.h"
> > > >
> > > > -static int pool_op_gen_alloc(struct tee_shm_pool_mgr *poolm,
> > > > - struct tee_shm *shm, size_t size)
> > > > +static int pool_op_gen_alloc(struct tee_shm_pool *pool, struct tee_shm *shm,
> > > > + size_t size, size_t align)
> > > > {
> > > > unsigned long va;
> > > > - struct gen_pool *genpool = poolm->private_data;
> > > > - size_t s = roundup(size, 1 << genpool->min_alloc_order);
> > > > + struct gen_pool *genpool = pool->private_data;
> > > > + size_t a = max_t(size_t, align, BIT(genpool->min_alloc_order));
> > > > + struct genpool_data_align data = { .align = a };
> > > > + size_t s = roundup(size, a);
> > > >
> > > > - va = gen_pool_alloc(genpool, s);
> > > > + va = gen_pool_alloc_algo(genpool, s, gen_pool_first_fit_align, &data);
> > > > if (!va)
> > > > return -ENOMEM;
> > > >
> > > > @@ -24,107 +26,67 @@ static int pool_op_gen_alloc(struct tee_shm_pool_mgr *poolm,
> > > > shm->kaddr = (void *)va;
> > > > shm->paddr = gen_pool_virt_to_phys(genpool, va);
> > > > shm->size = s;
> > > > + /*
> > > > + * This is from a static shared memory pool so no need to register
> > > > + * each chunk, and no need to unregister later either.
> > > > + */
> > > > + shm->flags &= ~TEE_SHM_REGISTER;
> > > > return 0;
> > > > }
> > > >
> > > > -static void pool_op_gen_free(struct tee_shm_pool_mgr *poolm,
> > > > - struct tee_shm *shm)
> > > > +static void pool_op_gen_free(struct tee_shm_pool *pool, struct tee_shm *shm)
> > > > {
> > > > - gen_pool_free(poolm->private_data, (unsigned long)shm->kaddr,
> > > > + gen_pool_free(pool->private_data, (unsigned long)shm->kaddr,
> > > > shm->size);
> > > > shm->kaddr = NULL;
> > > > }
> > > >
> > > > -static void pool_op_gen_destroy_poolmgr(struct tee_shm_pool_mgr *poolm)
> > > > +static void pool_op_gen_destroy_pool(struct tee_shm_pool *pool)
> > > > {
> > > > - gen_pool_destroy(poolm->private_data);
> > > > - kfree(poolm);
> > > > + gen_pool_destroy(pool->private_data);
> > > > + kfree(pool);
> > > > }
> > > >
> > > > -static const struct tee_shm_pool_mgr_ops pool_ops_generic = {
> > > > +static const struct tee_shm_pool_ops pool_ops_generic = {
> > > > .alloc = pool_op_gen_alloc,
> > > > .free = pool_op_gen_free,
> > > > - .destroy_poolmgr = pool_op_gen_destroy_poolmgr,
> > > > + .destroy_pool = pool_op_gen_destroy_pool,
> > > > };
> > > >
> > > > -struct tee_shm_pool_mgr *tee_shm_pool_mgr_alloc_res_mem(unsigned long vaddr,
> > > > - phys_addr_t paddr,
> > > > - size_t size,
> > > > - int min_alloc_order)
> > > > +struct tee_shm_pool *tee_shm_pool_alloc_res_mem(unsigned long vaddr,
> > > > + phys_addr_t paddr, size_t size,
> > > > + int min_alloc_order)
> > > > {
> > > > const size_t page_mask = PAGE_SIZE - 1;
> > > > - struct tee_shm_pool_mgr *mgr;
> > > > + struct tee_shm_pool *pool;
> > > > int rc;
> > > >
> > > > /* Start and end must be page aligned */
> > > > if (vaddr & page_mask || paddr & page_mask || size & page_mask)
> > > > return ERR_PTR(-EINVAL);
> > > >
> > > > - mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
> > > > - if (!mgr)
> > > > + pool = kzalloc(sizeof(*pool), GFP_KERNEL);
> > > > + if (!pool)
> > > > return ERR_PTR(-ENOMEM);
> > > >
> > > > - mgr->private_data = gen_pool_create(min_alloc_order, -1);
> > > > - if (!mgr->private_data) {
> > > > + pool->private_data = gen_pool_create(min_alloc_order, -1);
> > > > + if (!pool->private_data) {
> > > > rc = -ENOMEM;
> > > > goto err;
> > > > }
> > > >
> > > > - gen_pool_set_algo(mgr->private_data, gen_pool_best_fit, NULL);
> > > > - rc = gen_pool_add_virt(mgr->private_data, vaddr, paddr, size, -1);
> > > > + rc = gen_pool_add_virt(pool->private_data, vaddr, paddr, size, -1);
> > > > if (rc) {
> > > > - gen_pool_destroy(mgr->private_data);
> > > > + gen_pool_destroy(pool->private_data);
> > > > goto err;
> > > > }
> > > >
> > > > - mgr->ops = &pool_ops_generic;
> > > > + pool->ops = &pool_ops_generic;
> > > >
> > > > - return mgr;
> > > > + return pool;
> > > > err:
> > > > - kfree(mgr);
> > > > + kfree(pool);
> > > >
> > > > return ERR_PTR(rc);
> > > > }
> > > > -EXPORT_SYMBOL_GPL(tee_shm_pool_mgr_alloc_res_mem);
> > > > -
> > > > -static bool check_mgr_ops(struct tee_shm_pool_mgr *mgr)
> > > > -{
> > > > - return mgr && mgr->ops && mgr->ops->alloc && mgr->ops->free &&
> > > > - mgr->ops->destroy_poolmgr;
> > > > -}
> > > > -
> > > > -struct tee_shm_pool *tee_shm_pool_alloc(struct tee_shm_pool_mgr *priv_mgr,
> > > > - struct tee_shm_pool_mgr *dmabuf_mgr)
> > > > -{
> > > > - struct tee_shm_pool *pool;
> > > > -
> > > > - if (!check_mgr_ops(priv_mgr) || !check_mgr_ops(dmabuf_mgr))
> > > > - return ERR_PTR(-EINVAL);
> > > > -
> > > > - pool = kzalloc(sizeof(*pool), GFP_KERNEL);
> > > > - if (!pool)
> > > > - return ERR_PTR(-ENOMEM);
> > > > -
> > > > - pool->private_mgr = priv_mgr;
> > > > - pool->dma_buf_mgr = dmabuf_mgr;
> > > > -
> > > > - return pool;
> > > > -}
> > > > -EXPORT_SYMBOL_GPL(tee_shm_pool_alloc);
> > > > -
> > > > -/**
> > > > - * tee_shm_pool_free() - Free a shared memory pool
> > > > - * @pool: The shared memory pool to free
> > > > - *
> > > > - * There must be no remaining shared memory allocated from this pool when
> > > > - * this function is called.
> > > > - */
> > > > -void tee_shm_pool_free(struct tee_shm_pool *pool)
> > > > -{
> > > > - if (pool->private_mgr)
> > > > - tee_shm_pool_mgr_destroy(pool->private_mgr);
> > > > - if (pool->dma_buf_mgr)
> > > > - tee_shm_pool_mgr_destroy(pool->dma_buf_mgr);
> > > > - kfree(pool);
> > > > -}
> > > > -EXPORT_SYMBOL_GPL(tee_shm_pool_free);
> > > > +EXPORT_SYMBOL_GPL(tee_shm_pool_alloc_res_mem);
> > > > diff --git a/include/linux/tee_drv.h b/include/linux/tee_drv.h
> > > > index 26b450484ac1..808aa23308c2 100644
> > > > --- a/include/linux/tee_drv.h
> > > > +++ b/include/linux/tee_drv.h
> > > > @@ -221,62 +221,39 @@ struct tee_shm {
> > > > };
> > > >
> > > > /**
> > > > - * struct tee_shm_pool_mgr - shared memory manager
> > > > + * struct tee_shm_pool - shared memory pool
> > > > * @ops: operations
> > > > * @private_data: private data for the shared memory manager
> > > > */
> > > > -struct tee_shm_pool_mgr {
> > > > - const struct tee_shm_pool_mgr_ops *ops;
> > > > +struct tee_shm_pool {
> > > > + const struct tee_shm_pool_ops *ops;
> > > > void *private_data;
> > > > };
> > > >
> > > > /**
> > > > - * struct tee_shm_pool_mgr_ops - shared memory pool manager operations
> > > > + * struct tee_shm_pool_ops - shared memory pool operations
> > > > * @alloc: called when allocating shared memory
> > > > * @free: called when freeing shared memory
> > > > - * @destroy_poolmgr: called when destroying the pool manager
> > > > + * @destroy_pool: called when destroying the pool
> > > > */
> > > > -struct tee_shm_pool_mgr_ops {
> > > > - int (*alloc)(struct tee_shm_pool_mgr *poolmgr, struct tee_shm *shm,
> > > > - size_t size);
> > > > - void (*free)(struct tee_shm_pool_mgr *poolmgr, struct tee_shm *shm);
> > > > - void (*destroy_poolmgr)(struct tee_shm_pool_mgr *poolmgr);
> > > > +struct tee_shm_pool_ops {
> > > > + int (*alloc)(struct tee_shm_pool *pool, struct tee_shm *shm,
> > > > + size_t size, size_t align);
> > > > + void (*free)(struct tee_shm_pool *pool, struct tee_shm *shm);
> > > > + void (*destroy_pool)(struct tee_shm_pool *pool);
> > > > };
> > > >
> > > > -/**
> > > > - * tee_shm_pool_alloc() - Create a shared memory pool from shm managers
> > > > - * @priv_mgr: manager for driver private shared memory allocations
> > > > - * @dmabuf_mgr: manager for dma-buf shared memory allocations
> > > > - *
> > > > - * Allocation with the flag TEE_SHM_DMA_BUF set will use the range supplied
> > > > - * in @dmabuf, others will use the range provided by @priv.
> > > > - *
> > > > - * @returns pointer to a 'struct tee_shm_pool' or an ERR_PTR on failure.
> > > > - */
> > > > -struct tee_shm_pool *tee_shm_pool_alloc(struct tee_shm_pool_mgr *priv_mgr,
> > > > - struct tee_shm_pool_mgr *dmabuf_mgr);
> > > > -
> > > > /*
> > > > - * tee_shm_pool_mgr_alloc_res_mem() - Create a shm manager for reserved
> > > > - * memory
> > > > + * tee_shm_pool_alloc_res_mem() - Create a shm manager for reserved memory
> > > > * @vaddr: Virtual address of start of pool
> > > > * @paddr: Physical address of start of pool
> > > > * @size: Size in bytes of the pool
> > > > *
> > > > - * @returns pointer to a 'struct tee_shm_pool_mgr' or an ERR_PTR on failure.
> > > > - */
> > > > -struct tee_shm_pool_mgr *tee_shm_pool_mgr_alloc_res_mem(unsigned long vaddr,
> > > > - phys_addr_t paddr,
> > > > - size_t size,
> > > > - int min_alloc_order);
> > > > -
> > > > -/**
> > > > - * tee_shm_pool_mgr_destroy() - Free a shared memory manager
> > > > + * @returns pointer to a 'struct tee_shm_pool' or an ERR_PTR on failure.
> > > > */
> > > > -static inline void tee_shm_pool_mgr_destroy(struct tee_shm_pool_mgr *poolm)
> > > > -{
> > > > - poolm->ops->destroy_poolmgr(poolm);
> > > > -}
> > > > +struct tee_shm_pool *tee_shm_pool_alloc_res_mem(unsigned long vaddr,
> > > > + phys_addr_t paddr, size_t size,
> > > > + int min_alloc_order);
> > > >
> > > > /**
> > > > * tee_shm_pool_free() - Free a shared memory pool
> > > > @@ -285,7 +262,10 @@ static inline void tee_shm_pool_mgr_destroy(struct tee_shm_pool_mgr *poolm)
> > > > * The must be no remaining shared memory allocated from this pool when
> > > > * this function is called.
> > > > */
> > > > -void tee_shm_pool_free(struct tee_shm_pool *pool);
> > > > +static inline void tee_shm_pool_free(struct tee_shm_pool *pool)
> > > > +{
> > > > + pool->ops->destroy_pool(pool);
> > > > +}
> > > >
> > > > /**
> > > > * tee_get_drvdata() - Return driver_data pointer
> > > > --
> > > > 2.31.1
> > > >
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