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| author | Sudeep Holla <sudeep.holla@arm.com> | 2023-10-05 17:45:06 +0300 |
|---|---|---|
| committer | Sudeep Holla <sudeep.holla@arm.com> | 2023-10-06 17:33:14 +0300 |
| commit | c9b21ef0d0a87695d7bfeee9a04b89760b49ccf5 (patch) | |
| tree | 3208e9ad4b824e708de6d85c541a16f073b0ceed /drivers/firmware | |
| parent | 1b6bf41b7a65cf2ce4485f740a2764529635153c (diff) | |
| download | linux-c9b21ef0d0a87695d7bfeee9a04b89760b49ccf5.tar.xz | |
firmware: arm_ffa: Simplify the computation of transmit and fragment length
The computation of endpoint memory access descriptor's composite memory
region descriptor offset is using COMPOSITE_CONSTITUENTS_OFFSET which is
unnecessary complicated. Composite memory region descriptor always follow
the endpoint memory access descriptor array and hence it is computed
accordingly. COMPOSITE_CONSTITUENTS_OFFSET is useless and wrong for any
input other than endpoint memory access descriptor count.
Let us drop the usage of COMPOSITE_CONSTITUENTS_OFFSET to simplify the
computation of total transmit and fragment length in the memory
transactions.
Link: https://lore.kernel.org/r/20231005-ffa_v1-1_notif-v4-13-cddd3237809c@arm.com
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Diffstat (limited to 'drivers/firmware')
| -rw-r--r-- | drivers/firmware/arm_ffa/driver.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c index 6f688b4a4620..49fcbeb63eaa 100644 --- a/drivers/firmware/arm_ffa/driver.c +++ b/drivers/firmware/arm_ffa/driver.c @@ -442,23 +442,25 @@ ffa_setup_and_transmit(u32 func_id, void *buffer, u32 max_fragsize, { int rc = 0; bool first = true; + u32 composite_offset; phys_addr_t addr = 0; + struct ffa_mem_region *mem_region = buffer; struct ffa_composite_mem_region *composite; struct ffa_mem_region_addr_range *constituents; struct ffa_mem_region_attributes *ep_mem_access; - struct ffa_mem_region *mem_region = buffer; 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 = &mem_region->ep_mem_access[0]; + ep_mem_access = buffer + COMPOSITE_OFFSET(0); + composite_offset = COMPOSITE_OFFSET(args->nattrs); for (idx = 0; idx < args->nattrs; idx++, ep_mem_access++) { 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->composite_off = composite_offset; ep_mem_access->flag = 0; ep_mem_access->reserved = 0; } @@ -467,13 +469,13 @@ ffa_setup_and_transmit(u32 func_id, void *buffer, u32 max_fragsize, mem_region->reserved_1 = 0; mem_region->ep_count = args->nattrs; - composite = buffer + COMPOSITE_OFFSET(args->nattrs); + composite = buffer + composite_offset; 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); + length = composite_offset + CONSTITUENTS_OFFSET(num_entries); + frag_len = composite_offset + CONSTITUENTS_OFFSET(0); if (frag_len > max_fragsize) return -ENXIO; |