linux-kernel - [PATCH RFT v2 16/18] firmware: arm_ffa: Switch to using ffa_mem_desc

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Message-Id: <20230919-ffa_v1-1_notif-v2-16-6f3a3ca3923c@arm.com>
Date:   Tue, 19 Sep 2023 18:41:04 +0100
From:   Sudeep Holla <sudeep.holla@....com>
To:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Sudeep Holla <sudeep.holla@....com>,
        Jens Wiklander <jens.wiklander@...aro.org>,
        Marc Bonnici <marc.bonnici@....com>,
        Coboy Chen <coboy.chen@...iatek.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Olivier Deprez <olivier.deprez@....com>
Subject: [PATCH RFT v2 16/18] firmware: arm_ffa: Switch to using
 ffa_mem_desc_offset() accessor

In preparation to add support to the new memory transaction descriptor,
the ep_mem_access member needs to be removed and hence even the macro
COMPOSITE_OFFSET(). Let us switch to using the new ffa_mem_desc_offset()
accessor in ffa_setup_and_transmit().

This will enable adding the support for new format transparently without
any changes here again.

Signed-off-by: Sudeep Holla <sudeep.holla@....com>
---
 drivers/firmware/arm_ffa/driver.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c
index dadd56d17c20..e0a0c7cedd90 100644
--- a/drivers/firmware/arm_ffa/driver.c
+++ b/drivers/firmware/arm_ffa/driver.c
@@ -449,14 +449,15 @@ ffa_setup_and_transmit(u32 func_id, void *buffer, u32 max_fragsize,
 	struct ffa_composite_mem_region *composite;
 	struct ffa_mem_region_addr_range *constituents;
 	struct ffa_mem_region_attributes *ep_mem_access;
+	bool mdesc_v1 = drv_info->version <= FFA_VERSION_1_0;
 	u32 idx, frag_len, length, buf_sz = 0, num_entries = sg_nents(args->sg);
 
 	mem_region->tag = args->tag;
 	mem_region->flags = args->flags;
 	mem_region->sender_id = drv_info->vm_id;
 	mem_region->attributes = ffa_memory_attributes_get(func_id);
-	ep_mem_access = buffer + COMPOSITE_OFFSET(0);
-	composite_offset = COMPOSITE_OFFSET(args->nattrs);
+	ep_mem_access = buffer + ffa_mem_desc_offset(buffer, 0, mdesc_v1);
+	composite_offset = ffa_mem_desc_offset(buffer, args->nattrs, mdesc_v1);
 
 	for (idx = 0; idx < args->nattrs; idx++, ep_mem_access++) {
 		ep_mem_access->receiver = args->attrs[idx].receiver;

-- 
2.42.0