On Thu, Sep 08, 2022 at 12:08:00PM +0200, Jens Wiklander wrote:

On Wed, Sep 7, 2022 at 4:53 PM Sudeep Holla [off-list ref] wrote:

quoted

FF-A v1.1 adds a flag in the partition properties to indicate if the
partition runs in the AArch32 or AArch64 execution state. Use the same
to set-up the 32-bit execution flag mode in the ffa_dev automatically
and ignore any requests to do the same from the ffa_driver.

Signed-off-by: Sudeep Holla <redacted>
---
 drivers/firmware/arm_ffa/driver.c | 13 ++++++++++++-
 include/linux/arm_ffa.h           |  2 ++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c
index 42bc22220c69..34e12a2a98fe 100644
--- a/drivers/firmware/arm_ffa/driver.c
+++ b/drivers/firmware/arm_ffa/driver.c

@@ -648,11 +648,19 @@ static int ffa_partition_info_get(const char *uuid_str,
        return 0;
 }

-static void ffa_mode_32bit_set(struct ffa_device *dev)
+static void _ffa_mode_32bit_set(struct ffa_device *dev)
 {
        dev->mode_32bit = true;
 }

+static void ffa_mode_32bit_set(struct ffa_device *dev)
+{
+       if (drv_info->version > FFA_VERSION_1_0)
+               return;
+
+       _ffa_mode_32bit_set(dev);
+}
+
 static int ffa_sync_send_receive(struct ffa_device *dev,
                                 struct ffa_send_direct_data *data)
 {

@@ -744,6 +752,9 @@ static void ffa_setup_partitions(void)
                               __func__, tpbuf->id);
                        continue;
                }
+
+               if (!(tpbuf->properties & FFA_PARTITION_AARCH64_EXEC))
+                       _ffa_mode_32bit_set(ffa_dev);

For FF-A 1.0 it looks like we change the dev->mode_32bit default value
from false to true. Or am I missing something?

You are right, was trying to avoid additional check on version but we
need that to keep the behaviour unchanged. I will add the check. Thanks
again for spotting this.

-- 
Regards,
Sudeep

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