[PATCH 05/10] cxgb3: simplify iwch_get_dma_wr

Christoph Hellwig
2015-12-18T13:55:01Z

Fold simplified versions of build_phys_page_list and
iwch_register_phys_mem into iwch_get_dma_wr now that no other callers
are left.

Signed-off-by: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
Reviewed-by: Sagi Grimberg <sagig-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Reviewed-by: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org> [core]
Reviewed-by: Steve Wise <swise-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>
---
drivers/infiniband/hw/cxgb3/iwch_mem.c | 71 ----------------------------
drivers/infiniband/hw/cxgb3/iwch_provider.c | 73 ++++++++++-------------------
drivers/infiniband/hw/cxgb3/iwch_provider.h | 8 ----
3 files changed, 26 insertions(+), 126 deletions(-)

diff --git a/drivers/infiniband/hw/cxgb3/iwch_mem.c b/drivers/infiniband/hw/cxgb3/iwch_mem.c
index 3a5e27d..1d04c87 100644
--- a/drivers/infiniband/hw/cxgb3/iwch_mem.c
+++ b/drivers/infiniband/hw/cxgb3/iwch_mem.c
@@ -99,74 +99,3 @@ int iwch_write_pbl(struct iwch_mr *mhp, __be64 *pages, int npages, int offset)
return cxio_write_pbl(&mhp->rhp->rdev, pages,
mhp->attr.pbl_addr + (offset << 3), npages);
}
-
-int build_phys_page_list(struct ib_phys_buf *buffer_list,
- int num_phys_buf,
- u64 *iova_start,
- u64 *total_size,
- int *npages,
- int *shift,
- __be64 **page_list)
-{
- u64 mask;
- int i, j, n;
-
- mask = 0;
- *total_size = 0;
- for (i = 0; i < num_phys_buf; ++i) {
- if (i != 0 && buffer_list[i].addr & ~PAGE_MASK)
- return -EINVAL;
- if (i != 0 && i != num_phys_buf - 1 &&
- (buffer_list[i].size & ~PAGE_MASK))
- return -EINVAL;
- *total_size += buffer_list[i].size;
- if (i > 0)
- mask |= buffer_list[i].addr;
- else
- mask |= buffer_list[i].addr & PAGE_MASK;
- if (i != num_phys_buf - 1)
- mask |= buffer_list[i].addr + buffer_list[i].size;
- else
- mask |= (buffer_list[i].addr + buffer_list[i].size +
- PAGE_SIZE - 1) & PAGE_MASK;
- }
-
- if (*total_size > 0xFFFFFFFFULL)
- return -ENOMEM;
-
- /* Find largest page shift we can use to cover buffers */
- for (*shift = PAGE_SHIFT; *shift < 27; ++(*shift))
- if ((1ULL << *shift) & mask)
- break;
-
- buffer_list[0].size += buffer_list[0].addr & ((1ULL << *shift) - 1);
- buffer_list[0].addr &= ~0ull << *shift;
-
- *npages = 0;
- for (i = 0; i < num_phys_buf; ++i)
- *npages += (buffer_list[i].size +
- (1ULL << *shift) - 1) >> *shift;
-
- if (!*npages)
- return -EINVAL;
-
- *page_list = kmalloc(sizeof(u64) * *npages, GFP_KERNEL);
- if (!*page_list)
- return -ENOMEM;
-
- n = 0;
- for (i = 0; i < num_phys_buf; ++i)
- for (j = 0;
- j < (buffer_list[i].size + (1ULL << *shift) - 1) >> *shift;
- ++j)
- (*page_list)[n++] = cpu_to_be64(buffer_list[i].addr +
- ((u64) j << *shift));
-
- PDBG("%s va 0x%llx mask 0x%llx shift %d len %lld pbl_size %d\n",
- __func__, (unsigned long long) *iova_start,
- (unsigned long long) mask, *shift, (unsigned long long) *total_size,
- *npages);
-
- return 0;
-
-}
diff --git a/drivers/infiniband/hw/cxgb3/iwch_provider.c b/drivers/infiniband/hw/cxgb3/iwch_provider.c
index b184933..097eb93 100644
--- a/drivers/infiniband/hw/cxgb3/iwch_provider.c
+++ b/drivers/infiniband/hw/cxgb3/iwch_provider.c
@@ -479,24 +479,25 @@ static int iwch_dereg_mr(struct ib_mr *ib_mr)
return 0;
}

-static struct ib_mr *iwch_register_phys_mem(struct ib_pd *pd,
- struct ib_phys_buf *buffer_list,
- int num_phys_buf,
- int acc,
- u64 *iova_start)
+static struct ib_mr *iwch_get_dma_mr(struct ib_pd *pd, int acc)
{
- __be64 *page_list;
- int shift;
- u64 total_size;
- int npages;
- struct iwch_dev *rhp;
- struct iwch_pd *php;
+ const u64 total_size = 0xffffffff;
+ const u64 mask = (total_size + PAGE_SIZE - 1) & PAGE_MASK;
+ struct iwch_pd *php = to_iwch_pd(pd);
+ struct iwch_dev *rhp = php->rhp;
struct iwch_mr *mhp;
- int ret;
+ __be64 *page_list;
+ int shift = 26, npages, ret, i;

PDBG("%s ib_pd %p\n", __func__, pd);
- php = to_iwch_pd(pd);
- rhp = php->rhp;
+
+ /*
+ * T3 only supports 32 bits of size.
+ */
+ if (sizeof(phys_addr_t) > 4) {
+ pr_warn_once(MOD "Cannot support dma_mrs on this platform.\n");
+ return ERR_PTR(-ENOTSUPP);
+ }

mhp = kzalloc(sizeof(*mhp), GFP_KERNEL);
if (!mhp)
@@ -504,22 +505,23 @@ static struct ib_mr *iwch_register_phys_mem(struct ib_pd *pd,

mhp->rhp = rhp;

- /* First check that we have enough alignment */
- if ((*iova_start & ~PAGE_MASK) != (buffer_list[0].addr & ~PAGE_MASK)) {
+ npages = (total_size + (1ULL << shift) - 1) >> shift;
+ if (!npages) {
ret = -EINVAL;
goto err;
}

- if (num_phys_buf > 1 &&
- ((buffer_list[0].addr + buffer_list[0].size) & ~PAGE_MASK)) {
- ret = -EINVAL;
+ page_list = kmalloc_array(npages, sizeof(u64), GFP_KERNEL);
+ if (!page_list) {
+ ret = -ENOMEM;
goto err;
}

- ret = build_phys_page_list(buffer_list, num_phys_buf, iova_start,
- &total_size, &npages, &shift, &page_list);
- if (ret)
- goto err;
+ for (i = 0; i < npages; i++)
+ page_list[i] = cpu_to_be64((u64)i << shift);
+
+ PDBG("%s mask 0x%llx shift %d len %lld pbl_size %d\n",
+ __func__, mask, shift, total_size, npages);

ret = iwch_alloc_pbl(mhp, npages);
if (ret) {
@@ -536,7 +538,7 @@ static struct ib_mr *iwch_register_phys_mem(struct ib_pd *pd,
mhp->attr.zbva = 0;

mhp->attr.perms = iwch_ib_to_tpt_access(acc);
- mhp->attr.va_fbo = *iova_start;
+ mhp->attr.va_fbo = 0;
mhp->attr.page_size = shift - 12;

mhp->attr.len = (u32) total_size;
@@ -553,7 +555,6 @@ err_pbl:
err:
kfree(mhp);
return ERR_PTR(ret);
-
}

static struct ib_mr *iwch_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
@@ -659,28 +660,6 @@ err:
return ERR_PTR(err);
}

-static struct ib_mr *iwch_get_dma_mr(struct ib_pd *pd, int acc)
-{
- struct ib_phys_buf bl;
- u64 kva;
- struct ib_mr *ibmr;
-
- PDBG("%s ib_pd %p\n", __func__, pd);
-
- /*
- * T3 only supports 32 bits of size.
- */
- if (sizeof(phys_addr_t) > 4) {
- pr_warn_once(MOD "Cannot support dma_mrs on this platform.\n");
- return ERR_PTR(-ENOTSUPP);
- }
- bl.size = 0xffffffff;
- bl.addr = 0;
- kva = 0;
- ibmr = iwch_register_phys_mem(pd, &bl, 1, acc, &kva);
- return ibmr;
-}
-
static struct ib_mw *iwch_alloc_mw(struct ib_pd *pd, enum ib_mw_type type)
{
struct iwch_dev *rhp;
diff --git a/drivers/infiniband/hw/cxgb3/iwch_provider.h b/drivers/infiniband/hw/cxgb3/iwch_provider.h
index f24df44..252c464 100644
--- a/drivers/infiniband/hw/cxgb3/iwch_provider.h
+++ b/drivers/infiniband/hw/cxgb3/iwch_provider.h
@@ -341,14 +341,6 @@ int iwch_register_mem(struct iwch_dev *rhp, struct iwch_pd *php,
int iwch_alloc_pbl(struct iwch_mr *mhp, int npages);
void iwch_free_pbl(struct iwch_mr *mhp);
int iwch_write_pbl(struct iwch_mr *mhp, __be64 *pages, int npages, int offset);
-int build_phys_page_list(struct ib_phys_buf *buffer_list,
- int num_phys_buf,
- u64 *iova_start,
- u64 *total_size,
- int *npages,
- int *shift,
- __be64 **page_list);
-

#define IWCH_NODE_DESC "cxgb3 Chelsio Communications"

--
1.9.1