x86/asm: Add a missing __iomem annotation in enqcmds()

stable inclusion
from stable-5.10.70
commit 54e85b6c287c1d4862c8b5a22646ad16eabcdb2e
bugzilla: 182949 https://gitee.com/openeuler/kernel/issues/I4I3GQ

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=54e85b6c287c1d4862c8b5a22646ad16eabcdb2e



--------------------------------

[ Upstream commit 5c99720b ]

Add a missing __iomem annotation to address a sparse warning. The caller
is expected to pass an __iomem annotated pointer to this function. The
current usages send a 64-bytes command descriptor to an MMIO location
(portal) on a device for consumption.

Also, from the comment in movdir64b(), which also applies to enqcmds(),
@__dst must be supplied as an lvalue because this tells the compiler
what the object is (its size) the instruction accesses. I.e., not the
pointers but what they point to, thus the deref'ing '*'."

The actual sparse warning is:

  drivers/dma/idxd/submit.c: note: in included file (through arch/x86/include/asm/processor.h, \
	arch/x86/include/asm/timex.h, include/linux/timex.h, include/linux/time32.h, \
	include/linux/time.h, include/linux/stat.h, ...):
  ./arch/x86/include/asm/special_insns.h:289:41: warning: incorrect type in initializer (different address spaces)
  ./arch/x86/include/asm/special_insns.h:289:41:    expected struct <noident> *__dst
  ./arch/x86/include/asm/special_insns.h:289:41:    got void [noderef] __iomem *dst

 [ bp: Massage commit message. ]

Fixes: 7f5933f8 ("x86/asm: Add an enqcmds() wrapper for the ENQCMDS instruction")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Ben Widawsky <ben.widawsky@intel.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Link: https://lkml.kernel.org/r/161003789741.4062451.14362269365703761223.stgit@djiang5-desk3.ch.intel.com


Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Chen Jun <chenjun102@huawei.com>
Acked-by: Weilong Chen <chenweilong@huawei.com>

Signed-off-by: Chen Jun <chenjun102@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>