firmware: arm_ffa: Set reserved/MBZ fields to zero in the memory descriptors

commit 111a833dc5cbef3d05b2a796a7e23cb7f6ff2192 upstream.

The transmit buffers allocated by the driver can be used to transmit data
by any messages/commands needing the buffer. However, it is not guaranteed
to have been zero-ed before every new transmission and hence it will just
contain residual value from the previous transmission. There are several
reserved fields in the memory descriptors that must be zero(MBZ). The
receiver can reject the transmission if any such MBZ fields are non-zero.

While we can set the whole page to zero, it is not optimal as most of the
fields get initialised to the value required for the current transmission.

So, just set the reserved/MBZ fields to zero in the memory descriptors
explicitly to honour the requirement and keep the receiver happy.

Fixes: cc2195fe536c ("firmware: arm_ffa: Add support for MEM_* interfaces")
Reported-by: Marc Bonnici <marc.bonnici@arm.com>
Link: https://lore.kernel.org/r/20230503131252.12585-1-sudeep.holla@arm.com
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c
index d5e86ef40b8960b2ab9dde32ffb2d36dbba4ec65..737f36e7a903513205f085e5b4e3eafbd4e27a57 100644 (file)
--- a/drivers/firmware/arm_ffa/driver.c
+++ b/drivers/firmware/arm_ffa/driver.c
@@ -501,12 +501,17 @@ ffa_setup_and_transmit(u32 func_id, void *buffer, u32 max_fragsize,
                ep_mem_access->receiver = args->attrs[idx].receiver;
                ep_mem_access->attrs = args->attrs[idx].attrs;
                ep_mem_access->composite_off = COMPOSITE_OFFSET(args->nattrs);
+               ep_mem_access->flag = 0;
+               ep_mem_access->reserved = 0;
        }
+       mem_region->reserved_0 = 0;
+       mem_region->reserved_1 = 0;
        mem_region->ep_count = args->nattrs;
 
        composite = buffer + COMPOSITE_OFFSET(args->nattrs);
        composite->total_pg_cnt = ffa_get_num_pages_sg(args->sg);
        composite->addr_range_cnt = num_entries;
+       composite->reserved = 0;
 
        length = COMPOSITE_CONSTITUENTS_OFFSET(args->nattrs, num_entries);
        frag_len = COMPOSITE_CONSTITUENTS_OFFSET(args->nattrs, 0);
@@ -541,6 +546,7 @@ ffa_setup_and_transmit(u32 func_id, void *buffer, u32 max_fragsize,
 
                constituents->address = sg_phys(args->sg);
                constituents->pg_cnt = args->sg->length / FFA_PAGE_SIZE;
+               constituents->reserved = 0;
                constituents++;
                frag_len += sizeof(struct ffa_mem_region_addr_range);
        } while ((args->sg = sg_next(args->sg)));