[PATCH 9/9] firmware: arm_ffa: Split up ffa_dev_ops into info, message and memory operations

Sudeep Holla
2022-08-30T10:12:54Z

In preparation to make memory operations accessible for a non
ffa_driver/device, it is better to split the ffa_dev_ops into different
categories of operations: info, message and memory. The info and memory
are ffa_device independent and can be used without any associated
ffa_device from a non ffa_driver.

However, we don't export these info and memory APIs yet without the user.
The first users of these APIs can export them.

Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
---
drivers/firmware/arm_ffa/driver.c | 14 ++++++++++++-
drivers/tee/optee/ffa_abi.c | 33 +++++++++++++++++--------------
include/linux/arm_ffa.h | 14 ++++++++++++-
3 files changed, 44 insertions(+), 17 deletions(-)

diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c
index 6822241168d6..d7a90c49fdcf 100644
--- a/drivers/firmware/arm_ffa/driver.c
+++ b/drivers/firmware/arm_ffa/driver.c
@@ -676,16 +676,28 @@ static int ffa_memory_lend(struct ffa_mem_ops_args *args)
return ffa_memory_ops(FFA_MEM_LEND, args);
}

-static const struct ffa_dev_ops ffa_ops = {
+static const struct ffa_dev_info_ops ffa_info_ops = {
.api_version_get = ffa_api_version_get,
.partition_info_get = ffa_partition_info_get,
+};
+
+static const struct ffa_dev_msg_ops ffa_msg_ops = {
.mode_32bit_set = ffa_mode_32bit_set,
.sync_send_receive = ffa_sync_send_receive,
+};
+
+static const struct ffa_dev_mem_ops ffa_mem_ops = {
.memory_reclaim = ffa_memory_reclaim,
.memory_share = ffa_memory_share,
.memory_lend = ffa_memory_lend,
};

+static const struct ffa_dev_ops ffa_ops = {
+ .info_ops = &ffa_info_ops,
+ .msg_ops = &ffa_msg_ops,
+ .mem_ops = &ffa_mem_ops,
+};
+
void ffa_device_match_uuid(struct ffa_device *ffa_dev, const uuid_t *uuid)
{
int count, idx;
diff --git a/drivers/tee/optee/ffa_abi.c b/drivers/tee/optee/ffa_abi.c
index 7257b42d0545..bbc63fd145a1 100644
--- a/drivers/tee/optee/ffa_abi.c
+++ b/drivers/tee/optee/ffa_abi.c
@@ -272,7 +272,7 @@ static int optee_ffa_shm_register(struct tee_context *ctx, struct tee_shm *shm,
{
struct optee *optee = tee_get_drvdata(ctx->teedev);
struct ffa_device *ffa_dev = optee->ffa.ffa_dev;
- const struct ffa_dev_ops *ffa_ops = ffa_dev->ops;
+ const struct ffa_dev_mem_ops *ffa_mem_ops = ffa_dev->ops->mem_ops;
struct ffa_mem_region_attributes mem_attr = {
.receiver = ffa_dev->vm_id,
.attrs = FFA_MEM_RW,
@@ -294,14 +294,14 @@ static int optee_ffa_shm_register(struct tee_context *ctx, struct tee_shm *shm,
if (rc)
return rc;
args.sg = sgt.sgl;
- rc = ffa_ops->memory_share(&args);
+ rc = ffa_mem_ops->memory_share(&args);
sg_free_table(&sgt);
if (rc)
return rc;

rc = optee_shm_add_ffa_handle(optee, shm, args.g_handle);
if (rc) {
- ffa_ops->memory_reclaim(args.g_handle, 0);
+ ffa_mem_ops->memory_reclaim(args.g_handle, 0);
return rc;
}

@@ -315,7 +315,8 @@ static int optee_ffa_shm_unregister(struct tee_context *ctx,
{
struct optee *optee = tee_get_drvdata(ctx->teedev);
struct ffa_device *ffa_dev = optee->ffa.ffa_dev;
- const struct ffa_dev_ops *ffa_ops = ffa_dev->ops;
+ const struct ffa_dev_msg_ops *ffa_msg_ops = ffa_dev->ops->msg_ops;
+ const struct ffa_dev_mem_ops *ffa_mem_ops = ffa_dev->ops->mem_ops;
u64 global_handle = shm->sec_world_id;
struct ffa_send_direct_data data = {
.data0 = OPTEE_FFA_UNREGISTER_SHM,
@@ -327,11 +328,11 @@ static int optee_ffa_shm_unregister(struct tee_context *ctx,
optee_shm_rem_ffa_handle(optee, global_handle);
shm->sec_world_id = 0;

- rc = ffa_ops->sync_send_receive(ffa_dev, &data);
+ rc = ffa_msg_ops->sync_send_receive(ffa_dev, &data);
if (rc)
pr_err("Unregister SHM id 0x%llx rc %d\n", global_handle, rc);

- rc = ffa_ops->memory_reclaim(global_handle, 0);
+ rc = ffa_mem_ops->memory_reclaim(global_handle, 0);
if (rc)
pr_err("mem_reclaim: 0x%llx %d", global_handle, rc);

@@ -342,7 +343,7 @@ static int optee_ffa_shm_unregister_supp(struct tee_context *ctx,
struct tee_shm *shm)
{
struct optee *optee = tee_get_drvdata(ctx->teedev);
- const struct ffa_dev_ops *ffa_ops = optee->ffa.ffa_dev->ops;
+ const struct ffa_dev_mem_ops *ffa_mem_ops;
u64 global_handle = shm->sec_world_id;
int rc;

@@ -353,7 +354,8 @@ static int optee_ffa_shm_unregister_supp(struct tee_context *ctx,
*/

optee_shm_rem_ffa_handle(optee, global_handle);
- rc = ffa_ops->memory_reclaim(global_handle, 0);
+ ffa_mem_ops = optee->ffa.ffa_dev->ops->mem_ops;
+ rc = ffa_mem_ops->memory_reclaim(global_handle, 0);
if (rc)
pr_err("mem_reclaim: 0x%llx %d", global_handle, rc);

@@ -530,7 +532,7 @@ static int optee_ffa_yielding_call(struct tee_context *ctx,
{
struct optee *optee = tee_get_drvdata(ctx->teedev);
struct ffa_device *ffa_dev = optee->ffa.ffa_dev;
- const struct ffa_dev_ops *ffa_ops = ffa_dev->ops;
+ const struct ffa_dev_msg_ops *ffa_msg_ops = ffa_dev->ops->msg_ops;
struct optee_call_waiter w;
u32 cmd = data->data0;
u32 w4 = data->data1;
@@ -541,7 +543,7 @@ static int optee_ffa_yielding_call(struct tee_context *ctx,
/* Initialize waiter */
optee_cq_wait_init(&optee->call_queue, &w);
while (true) {
- rc = ffa_ops->sync_send_receive(ffa_dev, data);
+ rc = ffa_msg_ops->sync_send_receive(ffa_dev, data);
if (rc)
goto done;

@@ -576,7 +578,7 @@ static int optee_ffa_yielding_call(struct tee_context *ctx,
* OP-TEE has returned with a RPC request.
*
* Note that data->data4 (passed in register w7) is already
- * filled in by ffa_ops->sync_send_receive() returning
+ * filled in by ffa_mem_ops->sync_send_receive() returning
* above.
*/
cond_resched();
@@ -654,12 +656,13 @@ static int optee_ffa_do_call_with_arg(struct tee_context *ctx,
static bool optee_ffa_api_is_compatbile(struct ffa_device *ffa_dev,
const struct ffa_dev_ops *ops)
{
+ const struct ffa_dev_msg_ops *ffa_msg_ops = ops->msg_ops;
struct ffa_send_direct_data data = { OPTEE_FFA_GET_API_VERSION };
int rc;

- ops->mode_32bit_set(ffa_dev);
+ ffa_msg_ops->mode_32bit_set(ffa_dev);

- rc = ops->sync_send_receive(ffa_dev, &data);
+ rc = ffa_msg_ops->sync_send_receive(ffa_dev, &data);
if (rc) {
pr_err("Unexpected error %d\n", rc);
return false;
@@ -672,7 +675,7 @@ static bool optee_ffa_api_is_compatbile(struct ffa_device *ffa_dev,
}

data = (struct ffa_send_direct_data){ OPTEE_FFA_GET_OS_VERSION };
- rc = ops->sync_send_receive(ffa_dev, &data);
+ rc = ffa_msg_ops->sync_send_receive(ffa_dev, &data);
if (rc) {
pr_err("Unexpected error %d\n", rc);
return false;
@@ -694,7 +697,7 @@ static bool optee_ffa_exchange_caps(struct ffa_device *ffa_dev,
struct ffa_send_direct_data data = { OPTEE_FFA_EXCHANGE_CAPABILITIES };
int rc;

- rc = ops->sync_send_receive(ffa_dev, &data);
+ rc = ops->msg_ops->sync_send_receive(ffa_dev, &data);
if (rc) {
pr_err("Unexpected error %d", rc);
return false;
diff --git a/include/linux/arm_ffa.h b/include/linux/arm_ffa.h
index b40afa7933dc..45e2b83d2364 100644
--- a/include/linux/arm_ffa.h
+++ b/include/linux/arm_ffa.h
@@ -255,16 +255,28 @@ struct ffa_mem_ops_args {
struct ffa_mem_region_attributes *attrs;
};

-struct ffa_dev_ops {
+struct ffa_dev_info_ops {
u32 (*api_version_get)(void);
int (*partition_info_get)(const char *uuid_str,
struct ffa_partition_info *buffer);
+};
+
+struct ffa_dev_msg_ops {
void (*mode_32bit_set)(struct ffa_device *dev);
int (*sync_send_receive)(struct ffa_device *dev,
struct ffa_send_direct_data *data);
+};
+
+struct ffa_dev_mem_ops {
int (*memory_reclaim)(u64 g_handle, u32 flags);
int (*memory_share)(struct ffa_mem_ops_args *args);
int (*memory_lend)(struct ffa_mem_ops_args *args);
};

+struct ffa_dev_ops {
+ const struct ffa_dev_info_ops *info_ops;
+ const struct ffa_dev_msg_ops *msg_ops;
+ const struct ffa_dev_mem_ops *mem_ops;
+};
+
#endif /* _LINUX_ARM_FFA_H */
--
2.37.2