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SubjectRe: [PATCH for-next 2/4] RDMA/hns: Add IOMMU enable support in hip08
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On 2017/10/1 0:10, Leon Romanovsky wrote:
> On Sat, Sep 30, 2017 at 05:28:59PM +0800, Wei Hu (Xavier) wrote:
>> If the IOMMU is enabled, the length of sg obtained from
>> __iommu_map_sg_attrs is not 4kB. When the IOVA is set with the sg
>> dma address, the IOVA will not be page continuous. and the VA
>> returned from dma_alloc_coherent is a vmalloc address. However,
>> the VA obtained by the page_address is a discontinuous VA. Under
>> these circumstances, the IOVA should be calculated based on the
>> sg length, and record the VA returned from dma_alloc_coherent
>> in the struct of hem.
>>
>> Signed-off-by: Wei Hu (Xavier) <xavier.huwei@huawei.com>
>> Signed-off-by: Shaobo Xu <xushaobo2@huawei.com>
>> Signed-off-by: Lijun Ou <oulijun@huawei.com>
>> ---
> Doug,
>
> I didn't invest time in reviewing it, but having "is_vmalloc_addr" in
> driver code to deal with dma_alloc_coherent is most probably wrong.
>
> Thanks
Hi, Leon & Doug
We refered the function named __ttm_dma_alloc_page in the kernel
code as below:
And there are similar methods in bch_bio_map and mem_to_page
functions in current 4.14-rcx.

static struct dma_page *__ttm_dma_alloc_page(struct dma_pool *pool)
{
struct dma_page *d_page;

d_page = kmalloc(sizeof(struct dma_page), GFP_KERNEL);
if (!d_page)
return NULL;

d_page->vaddr = dma_alloc_coherent(pool->dev, pool->size,
&d_page->dma,
pool->gfp_flags);
if (d_page->vaddr) {
if (is_vmalloc_addr(d_page->vaddr))
d_page->p = vmalloc_to_page(d_page->vaddr);
else
d_page->p = virt_to_page(d_page->vaddr);
} else {
kfree(d_page);
d_page = NULL;
}
return d_page;
}

Regards
Wei Hu
>
>> drivers/infiniband/hw/hns/hns_roce_alloc.c | 5 ++++-
>> drivers/infiniband/hw/hns/hns_roce_hem.c | 30 +++++++++++++++++++++++++++---
>> drivers/infiniband/hw/hns/hns_roce_hem.h | 6 ++++++
>> drivers/infiniband/hw/hns/hns_roce_hw_v2.c | 22 +++++++++++++++-------
>> 4 files changed, 52 insertions(+), 11 deletions(-)
>>
>> diff --git a/drivers/infiniband/hw/hns/hns_roce_alloc.c b/drivers/infiniband/hw/hns/hns_roce_alloc.c
>> index 3e4c525..a69cd4b 100644
>> --- a/drivers/infiniband/hw/hns/hns_roce_alloc.c
>> +++ b/drivers/infiniband/hw/hns/hns_roce_alloc.c
>> @@ -243,7 +243,10 @@ int hns_roce_buf_alloc(struct hns_roce_dev *hr_dev, u32 size, u32 max_direct,
>> goto err_free;
>>
>> for (i = 0; i < buf->nbufs; ++i)
>> - pages[i] = virt_to_page(buf->page_list[i].buf);
>> + pages[i] =
>> + is_vmalloc_addr(buf->page_list[i].buf) ?
>> + vmalloc_to_page(buf->page_list[i].buf) :
>> + virt_to_page(buf->page_list[i].buf);
>>
>> buf->direct.buf = vmap(pages, buf->nbufs, VM_MAP,
>> PAGE_KERNEL);
>> diff --git a/drivers/infiniband/hw/hns/hns_roce_hem.c b/drivers/infiniband/hw/hns/hns_roce_hem.c
>> index 8388ae2..4a3d1d4 100644
>> --- a/drivers/infiniband/hw/hns/hns_roce_hem.c
>> +++ b/drivers/infiniband/hw/hns/hns_roce_hem.c
>> @@ -200,6 +200,7 @@ static struct hns_roce_hem *hns_roce_alloc_hem(struct hns_roce_dev *hr_dev,
>> gfp_t gfp_mask)
>> {
>> struct hns_roce_hem_chunk *chunk = NULL;
>> + struct hns_roce_vmalloc *vmalloc;
>> struct hns_roce_hem *hem;
>> struct scatterlist *mem;
>> int order;
>> @@ -227,6 +228,7 @@ static struct hns_roce_hem *hns_roce_alloc_hem(struct hns_roce_dev *hr_dev,
>> sg_init_table(chunk->mem, HNS_ROCE_HEM_CHUNK_LEN);
>> chunk->npages = 0;
>> chunk->nsg = 0;
>> + memset(chunk->vmalloc, 0, sizeof(chunk->vmalloc));
>> list_add_tail(&chunk->list, &hem->chunk_list);
>> }
>>
>> @@ -243,7 +245,15 @@ static struct hns_roce_hem *hns_roce_alloc_hem(struct hns_roce_dev *hr_dev,
>> if (!buf)
>> goto fail;
>>
>> - sg_set_buf(mem, buf, PAGE_SIZE << order);
>> + if (is_vmalloc_addr(buf)) {
>> + vmalloc = &chunk->vmalloc[chunk->npages];
>> + vmalloc->is_vmalloc_addr = true;
>> + vmalloc->vmalloc_addr = buf;
>> + sg_set_page(mem, vmalloc_to_page(buf),
>> + PAGE_SIZE << order, offset_in_page(buf));
>> + } else {
>> + sg_set_buf(mem, buf, PAGE_SIZE << order);
>> + }
>> WARN_ON(mem->offset);
>> sg_dma_len(mem) = PAGE_SIZE << order;
>>
>> @@ -262,17 +272,25 @@ static struct hns_roce_hem *hns_roce_alloc_hem(struct hns_roce_dev *hr_dev,
>> void hns_roce_free_hem(struct hns_roce_dev *hr_dev, struct hns_roce_hem *hem)
>> {
>> struct hns_roce_hem_chunk *chunk, *tmp;
>> + void *cpu_addr;
>> int i;
>>
>> if (!hem)
>> return;
>>
>> list_for_each_entry_safe(chunk, tmp, &hem->chunk_list, list) {
>> - for (i = 0; i < chunk->npages; ++i)
>> + for (i = 0; i < chunk->npages; ++i) {
>> + if (chunk->vmalloc[i].is_vmalloc_addr)
>> + cpu_addr = chunk->vmalloc[i].vmalloc_addr;
>> + else
>> + cpu_addr =
>> + lowmem_page_address(sg_page(&chunk->mem[i]));
>> +
>> dma_free_coherent(hr_dev->dev,
>> chunk->mem[i].length,
>> - lowmem_page_address(sg_page(&chunk->mem[i])),
>> + cpu_addr,
>> sg_dma_address(&chunk->mem[i]));
>> + }
>> kfree(chunk);
>> }
>>
>> @@ -774,6 +792,12 @@ void *hns_roce_table_find(struct hns_roce_dev *hr_dev,
>>
>> if (chunk->mem[i].length > (u32)offset) {
>> page = sg_page(&chunk->mem[i]);
>> + if (chunk->vmalloc[i].is_vmalloc_addr) {
>> + mutex_unlock(&table->mutex);
>> + return page ?
>> + chunk->vmalloc[i].vmalloc_addr
>> + + offset : NULL;
>> + }
>> goto out;
>> }
>> offset -= chunk->mem[i].length;
>> diff --git a/drivers/infiniband/hw/hns/hns_roce_hem.h b/drivers/infiniband/hw/hns/hns_roce_hem.h
>> index af28bbf..62d712a 100644
>> --- a/drivers/infiniband/hw/hns/hns_roce_hem.h
>> +++ b/drivers/infiniband/hw/hns/hns_roce_hem.h
>> @@ -72,11 +72,17 @@ enum {
>> HNS_ROCE_HEM_PAGE_SIZE = 1 << HNS_ROCE_HEM_PAGE_SHIFT,
>> };
>>
>> +struct hns_roce_vmalloc {
>> + bool is_vmalloc_addr;
>> + void *vmalloc_addr;
>> +};
>> +
>> struct hns_roce_hem_chunk {
>> struct list_head list;
>> int npages;
>> int nsg;
>> struct scatterlist mem[HNS_ROCE_HEM_CHUNK_LEN];
>> + struct hns_roce_vmalloc vmalloc[HNS_ROCE_HEM_CHUNK_LEN];
>> };
>>
>> struct hns_roce_hem {
>> diff --git a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
>> index b99d70a..9e19bf1 100644
>> --- a/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
>> +++ b/drivers/infiniband/hw/hns/hns_roce_hw_v2.c
>> @@ -1093,9 +1093,11 @@ static int hns_roce_v2_write_mtpt(void *mb_buf, struct hns_roce_mr *mr,
>> {
>> struct hns_roce_v2_mpt_entry *mpt_entry;
>> struct scatterlist *sg;
>> + u64 page_addr = 0;
>> u64 *pages;
>> + int i = 0, j = 0;
>> + int len = 0;
>> int entry;
>> - int i;
>>
>> mpt_entry = mb_buf;
>> memset(mpt_entry, 0, sizeof(*mpt_entry));
>> @@ -1153,14 +1155,20 @@ static int hns_roce_v2_write_mtpt(void *mb_buf, struct hns_roce_mr *mr,
>>
>> i = 0;
>> for_each_sg(mr->umem->sg_head.sgl, sg, mr->umem->nmap, entry) {
>> - pages[i] = ((u64)sg_dma_address(sg)) >> 6;
>> -
>> - /* Record the first 2 entry directly to MTPT table */
>> - if (i >= HNS_ROCE_V2_MAX_INNER_MTPT_NUM - 1)
>> - break;
>> - i++;
>> + len = sg_dma_len(sg) >> PAGE_SHIFT;
>> + for (j = 0; j < len; ++j) {
>> + page_addr = sg_dma_address(sg) +
>> + (j << mr->umem->page_shift);
>> + pages[i] = page_addr >> 6;
>> +
>> + /* Record the first 2 entry directly to MTPT table */
>> + if (i >= HNS_ROCE_V2_MAX_INNER_MTPT_NUM - 1)
>> + goto found;
>> + i++;
>> + }
>> }
>>
>> +found:
>> mpt_entry->pa0_l = cpu_to_le32(lower_32_bits(pages[0]));
>> roce_set_field(mpt_entry->byte_56_pa0_h, V2_MPT_BYTE_56_PA0_H_M,
>> V2_MPT_BYTE_56_PA0_H_S,
>> --
>> 1.9.1
>>


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