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Subject[PATCH RFT v2 13/18] firmware: arm_ffa: Don't set the memory region attributes for MEM_LEND
As per the FF-A specification: section "Usage of other memory region
attributes", in a transaction to donate memory or lend memory to a single
borrower, if the receiver is a PE or Proxy endpoint, the owner must not
specify the attributes and the relayer will return INVALID_PARAMETERS
if the attributes are set.

Let us not set the memory region attributes for MEM_LEND.

Fixes: 82a8daaecfd9 ("firmware: arm_ffa: Add support for MEM_LEND")
Reported-by: Joao Alves <joao.alves@arm.com>
Reported-by: Olivier Deprez <olivier.deprez@arm.com>
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
---
drivers/firmware/arm_ffa/driver.c | 16 ++++++++++++++--
1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c
index 8a5b5c274bb9..6312a7807d37 100644
--- a/drivers/firmware/arm_ffa/driver.c
+++ b/drivers/firmware/arm_ffa/driver.c
@@ -424,6 +424,19 @@ static u32 ffa_get_num_pages_sg(struct scatterlist *sg)
return num_pages;
}

+static u8 ffa_memory_attributes_get(u32 func_id)
+{
+ /*
+ * For the memory lend or donate operation, if the receiver is a PE or
+ * a proxy endpoint, the owner/sender must not specify the attributes
+ */
+ if (func_id == FFA_FN_NATIVE(MEM_LEND) ||
+ func_id == FFA_MEM_LEND)
+ return 0;
+
+ return FFA_MEM_NORMAL | FFA_MEM_WRITE_BACK | FFA_MEM_INNER_SHAREABLE;
+}
+
static int
ffa_setup_and_transmit(u32 func_id, void *buffer, u32 max_fragsize,
struct ffa_mem_ops_args *args)
@@ -440,8 +453,7 @@ ffa_setup_and_transmit(u32 func_id, void *buffer, u32 max_fragsize,
mem_region->tag = args->tag;
mem_region->flags = args->flags;
mem_region->sender_id = drv_info->vm_id;
- mem_region->attributes = FFA_MEM_NORMAL | FFA_MEM_WRITE_BACK |
- FFA_MEM_INNER_SHAREABLE;
+ mem_region->attributes = ffa_memory_attributes_get(func_id);
ep_mem_access = &mem_region->ep_mem_access[0];

for (idx = 0; idx < args->nattrs; idx++, ep_mem_access++) {
--
2.42.0

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