[PATCH 7/9] firmware: arm_ffa: Add v1.1 get_partition_info support

Sudeep Holla
2022-08-30T10:12:42Z

FF-A v1.1 adds support to discovery the UUIDs of the partitions that was
missing in v1.0 and which the driver workarounds by using UUIDs supplied
by the ffa_drivers.

Add the v1.1 get_partition_info support and disable the workaround if
the detected FF-A version is greater than v1.0.

Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
---
drivers/firmware/arm_ffa/driver.c | 39 ++++++++++++++++++++++++-------
include/linux/arm_ffa.h | 1 +
2 files changed, 32 insertions(+), 8 deletions(-)

diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c
index 5c8484b05c50..6822241168d6 100644
--- a/drivers/firmware/arm_ffa/driver.c
+++ b/drivers/firmware/arm_ffa/driver.c
@@ -264,18 +264,24 @@ static int ffa_rxtx_unmap(u16 vm_id)
return 0;
}

+#define PARTITION_INFO_GET_RETURN_COUNT_ONLY BIT(0)
+
/* buffer must be sizeof(struct ffa_partition_info) * num_partitions */
static int
__ffa_partition_info_get(u32 uuid0, u32 uuid1, u32 uuid2, u32 uuid3,
struct ffa_partition_info *buffer, int num_partitions)
{
- int count;
+ int idx, count, flags = 0, size;
ffa_value_t partition_info;

+ if (!buffer || !num_partitions) /* Just get the count for now */
+ flags = PARTITION_INFO_GET_RETURN_COUNT_ONLY;
+
mutex_lock(&drv_info->rx_lock);
invoke_ffa_fn((ffa_value_t){
.a0 = FFA_PARTITION_INFO_GET,
.a1 = uuid0, .a2 = uuid1, .a3 = uuid2, .a4 = uuid3,
+ .a5 = flags,
}, &partition_info);

if (partition_info.a0 == FFA_ERROR) {
@@ -285,8 +291,15 @@ __ffa_partition_info_get(u32 uuid0, u32 uuid1, u32 uuid2, u32 uuid3,

count = partition_info.a2;

+ if (drv_info->version > FFA_VERSION_1_0)
+ size = partition_info.a3;
+ else
+ size = 8; /* FFA_VERSION_1_0 lacks size in the response */
+
if (buffer && count <= num_partitions)
- memcpy(buffer, drv_info->rx_buffer, sizeof(*buffer) * count);
+ for (idx = 0; idx < count; idx++)
+ memcpy(buffer + idx, drv_info->rx_buffer + idx * size,
+ size);

ffa_rx_release();

@@ -678,6 +691,14 @@ void ffa_device_match_uuid(struct ffa_device *ffa_dev, const uuid_t *uuid)
int count, idx;
struct ffa_partition_info *pbuf, *tpbuf;

+ /*
+ * FF-A v1.1 provides UUID for each partition as part of the discovery
+ * API, the discovered UUID must be populated in the device's UUID and
+ * there is no need to copy the same from the driver table.
+ */
+ if (drv_info->version > FFA_VERSION_1_0)
+ return;
+
count = ffa_partition_probe(uuid, &pbuf);
if (count <= 0)
return;
@@ -691,6 +712,7 @@ void ffa_device_match_uuid(struct ffa_device *ffa_dev, const uuid_t *uuid)
static void ffa_setup_partitions(void)
{
int count, idx;
+ uuid_t uuid;
struct ffa_device *ffa_dev;
struct ffa_partition_info *pbuf, *tpbuf;

@@ -701,14 +723,15 @@ static void ffa_setup_partitions(void)
}

for (idx = 0, tpbuf = pbuf; idx < count; idx++, tpbuf++) {
- /* Note that the &uuid_null parameter will require
+ import_uuid(&uuid, (u8 *)tpbuf->uuid);
+
+ /* Note that the UUID will be uuid_null and that will require
* ffa_device_match() to find the UUID of this partition id
- * with help of ffa_device_match_uuid(). Once the FF-A spec
- * is updated to provide correct UUID here for each partition
- * as part of the discovery API, we need to pass the
- * discovered UUID here instead.
+ * with help of ffa_device_match_uuid(). FF-A v1.1 and above
+ * provides UUID here for each partition as part of the
+ * discovery API and the same is passed.
*/
- ffa_dev = ffa_device_register(&uuid_null, tpbuf->id, &ffa_ops);
+ ffa_dev = ffa_device_register(&uuid, tpbuf->id, &ffa_ops);
if (!ffa_dev) {
pr_err("%s: failed to register partition ID 0x%x\n",
__func__, tpbuf->id);
diff --git a/include/linux/arm_ffa.h b/include/linux/arm_ffa.h
index eafab07c9f58..b40afa7933dc 100644
--- a/include/linux/arm_ffa.h
+++ b/include/linux/arm_ffa.h
@@ -107,6 +107,7 @@ struct ffa_partition_info {
/* partition can send and receive indirect messages. */
#define FFA_PARTITION_INDIRECT_MSG BIT(2)
u32 properties;
+ u32 uuid[4];
};

/* For use with FFA_MSG_SEND_DIRECT_{REQ,RESP} which pass data via registers */
--
2.37.2