[PATCH] optee: add page list to kernel private shared memory
From: Jens Wiklander
Date: Thu Oct 26 2023 - 13:17:13 EST
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. Allocate the memory with alloc_pages_exact()
instead of alloc_pages() for more efficient memory usage.
Signed-off-by: Jens Wiklander <jens.wiklander@xxxxxxxxxx>
---
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