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SubjectRe: [PATCH v13 01/12] swiotlb: Refactor swiotlb init functions
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On 6/18/21 1:25 AM, Claire Chang wrote:
> On Fri, Jun 18, 2021 at 7:30 AM Stefano Stabellini
> <sstabellini@kernel.org> wrote:
>>
>> On Thu, 17 Jun 2021, Claire Chang wrote:
>>> Add a new function, swiotlb_init_io_tlb_mem, for the io_tlb_mem struct
>>> initialization to make the code reusable.
>>>
>>> Signed-off-by: Claire Chang <tientzu@chromium.org>
>>> Reviewed-by: Christoph Hellwig <hch@lst.de>
>>> Tested-by: Stefano Stabellini <sstabellini@kernel.org>
>>> Tested-by: Will Deacon <will@kernel.org>
>>> ---
>>> kernel/dma/swiotlb.c | 50 ++++++++++++++++++++++----------------------
>>> 1 file changed, 25 insertions(+), 25 deletions(-)
>>>
>>> diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
>>> index 52e2ac526757..47bb2a766798 100644
>>> --- a/kernel/dma/swiotlb.c
>>> +++ b/kernel/dma/swiotlb.c
>>> @@ -168,9 +168,28 @@ void __init swiotlb_update_mem_attributes(void)
>>> memset(vaddr, 0, bytes);
>>> }
>>>
>>> -int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
>>> +static void swiotlb_init_io_tlb_mem(struct io_tlb_mem *mem, phys_addr_t start,
>>> + unsigned long nslabs, bool late_alloc)
>>> {
>>> + void *vaddr = phys_to_virt(start);
>>> unsigned long bytes = nslabs << IO_TLB_SHIFT, i;
>>> +
>>> + mem->nslabs = nslabs;
>>> + mem->start = start;
>>> + mem->end = mem->start + bytes;
>>> + mem->index = 0;
>>> + mem->late_alloc = late_alloc;
>>> + spin_lock_init(&mem->lock);
>>> + for (i = 0; i < mem->nslabs; i++) {
>>> + mem->slots[i].list = IO_TLB_SEGSIZE - io_tlb_offset(i);
>>> + mem->slots[i].orig_addr = INVALID_PHYS_ADDR;
>>> + mem->slots[i].alloc_size = 0;
>>> + }
>>> + memset(vaddr, 0, bytes);
>>> +}
>>> +
>>> +int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
>>> +{
>>> struct io_tlb_mem *mem;
>>> size_t alloc_size;
>>>
>>> @@ -186,16 +205,8 @@ int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
>>> if (!mem)
>>> panic("%s: Failed to allocate %zu bytes align=0x%lx\n",
>>> __func__, alloc_size, PAGE_SIZE);
>>> - mem->nslabs = nslabs;
>>> - mem->start = __pa(tlb);
>>> - mem->end = mem->start + bytes;
>>> - mem->index = 0;
>>> - spin_lock_init(&mem->lock);
>>> - for (i = 0; i < mem->nslabs; i++) {
>>> - mem->slots[i].list = IO_TLB_SEGSIZE - io_tlb_offset(i);
>>> - mem->slots[i].orig_addr = INVALID_PHYS_ADDR;
>>> - mem->slots[i].alloc_size = 0;
>>> - }
>>> +
>>> + swiotlb_init_io_tlb_mem(mem, __pa(tlb), nslabs, false);
>>>
>>> io_tlb_default_mem = mem;
>>> if (verbose)
>>> @@ -282,8 +293,8 @@ swiotlb_late_init_with_default_size(size_t default_size)
>>> int
>>> swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
>>> {
>>> - unsigned long bytes = nslabs << IO_TLB_SHIFT, i;
>>> struct io_tlb_mem *mem;
>>> + unsigned long bytes = nslabs << IO_TLB_SHIFT;
>>>
>>> if (swiotlb_force == SWIOTLB_NO_FORCE)
>>> return 0;
>>> @@ -297,20 +308,9 @@ swiotlb_late_init_with_tbl(char *tlb, unsigned long nslabs)
>>> if (!mem)
>>> return -ENOMEM;
>>>
>>> - mem->nslabs = nslabs;
>>> - mem->start = virt_to_phys(tlb);
>>> - mem->end = mem->start + bytes;
>>> - mem->index = 0;
>>> - mem->late_alloc = 1;
>>> - spin_lock_init(&mem->lock);
>>> - for (i = 0; i < mem->nslabs; i++) {
>>> - mem->slots[i].list = IO_TLB_SEGSIZE - io_tlb_offset(i);
>>> - mem->slots[i].orig_addr = INVALID_PHYS_ADDR;
>>> - mem->slots[i].alloc_size = 0;
>>> - }
>>> -
>>> + memset(mem, 0, sizeof(*mem));
>>> + swiotlb_init_io_tlb_mem(mem, virt_to_phys(tlb), nslabs, true);
>>> set_memory_decrypted((unsigned long)tlb, bytes >> PAGE_SHIFT);
>>> - memset(tlb, 0, bytes);
>>
>> This is good for swiotlb_late_init_with_tbl. However I have just noticed
>> that mem could also be allocated from swiotlb_init_with_tbl, in which
>> case the zeroing is missing. I think we need another memset in
>> swiotlb_init_with_tbl as well. Or maybe it could be better to have a
>> single memset at the beginning of swiotlb_init_io_tlb_mem instead. Up to
>> you.
>
> swiotlb_init_with_tbl uses memblock_alloc to allocate the io_tlb_mem
> and memblock_alloc[1] will do memset in memblock_alloc_try_nid[2], so
> swiotlb_init_with_tbl is also good.
> I'm happy to add the memset in swiotlb_init_io_tlb_mem if you think
> it's clearer and safer.

On x86, if the memset is done before set_memory_decrypted() and memory
encryption is active, then the memory will look like ciphertext afterwards
and not be zeroes. If zeroed memory is required, then a memset must be
done after the set_memory_decrypted() calls.

Thanks,
Tom

>
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