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Arm FF-A fix for v6.6

Browse source 
It has been reported that the driver sets the memory region attributes
 for MEM_LEND operation when the specification clearly states not to. The
 fix here addresses the issue by ensuring the memory region attributes are
 cleared for the memory lending operation.
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Merge tag 'ffa-fix-6.6' of git://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux into arm/fixes

Arm FF-A fix for v6.6

It has been reported that the driver sets the memory region attributes
for MEM_LEND operation when the specification clearly states not to. The
fix here addresses the issue by ensuring the memory region attributes are
cleared for the memory lending operation.

* tag 'ffa-fix-6.6' of git://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux:
  firmware: arm_ffa: Don't set the memory region attributes for MEM_LEND

Link: https://lore.kernel.org/r/20230927121555.158619-1-sudeep.holla@arm.com
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Arnd Bergmann 2023-09-28 09:14:24 +02:00
commit 79684f2ea3
1 changed files with 14 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

16
drivers/firmware/arm_ffa/driver.c
View file

@ -397,6 +397,19 @@ 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)
@ -413,8 +426,7 @@ 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++) {