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author | Steve Wise <swise@opengridcomputing.com> | 2010-09-13 11:23:57 -0500 |
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committer | Roland Dreier <rolandd@cisco.com> | 2010-09-28 10:46:35 -0700 |
commit | c6d7b26791a2aefdf97f2af1e93161ed05acd631 (patch) | |
tree | 61b9b3af001fe5983aa84034d20e44eb43c039a8 /drivers/infiniband/hw/cxgb4/resource.c | |
parent | aadc4df3087a33ca7fc37f91a024e7b7efdafa75 (diff) | |
download | op-kernel-dev-c6d7b26791a2aefdf97f2af1e93161ed05acd631.zip op-kernel-dev-c6d7b26791a2aefdf97f2af1e93161ed05acd631.tar.gz |
RDMA/cxgb4: Support on-chip SQs
T4 support on-chip SQs to reduce latency. This patch adds support for
this in iw_cxgb4:
- Manage ocqp memory like other adapter mem resources.
- Allocate user mode SQs from ocqp mem if available.
- Map ocqp mem to user process using write combining.
- Map PCIE_MA_SYNC reg to user process.
Bump uverbs ABI.
Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'drivers/infiniband/hw/cxgb4/resource.c')
-rw-r--r-- | drivers/infiniband/hw/cxgb4/resource.c | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/cxgb4/resource.c b/drivers/infiniband/hw/cxgb4/resource.c index 26365f6..4fb50d5 100644 --- a/drivers/infiniband/hw/cxgb4/resource.c +++ b/drivers/infiniband/hw/cxgb4/resource.c @@ -422,3 +422,59 @@ void c4iw_rqtpool_destroy(struct c4iw_rdev *rdev) { gen_pool_destroy(rdev->rqt_pool); } + +/* + * On-Chip QP Memory. + */ +#define MIN_OCQP_SHIFT 12 /* 4KB == min ocqp size */ + +u32 c4iw_ocqp_pool_alloc(struct c4iw_rdev *rdev, int size) +{ + unsigned long addr = gen_pool_alloc(rdev->ocqp_pool, size); + PDBG("%s addr 0x%x size %d\n", __func__, (u32)addr, size); + return (u32)addr; +} + +void c4iw_ocqp_pool_free(struct c4iw_rdev *rdev, u32 addr, int size) +{ + PDBG("%s addr 0x%x size %d\n", __func__, addr, size); + gen_pool_free(rdev->ocqp_pool, (unsigned long)addr, size); +} + +int c4iw_ocqp_pool_create(struct c4iw_rdev *rdev) +{ + unsigned start, chunk, top; + + rdev->ocqp_pool = gen_pool_create(MIN_OCQP_SHIFT, -1); + if (!rdev->ocqp_pool) + return -ENOMEM; + + start = rdev->lldi.vr->ocq.start; + chunk = rdev->lldi.vr->ocq.size; + top = start + chunk; + + while (start < top) { + chunk = min(top - start + 1, chunk); + if (gen_pool_add(rdev->ocqp_pool, start, chunk, -1)) { + PDBG("%s failed to add OCQP chunk (%x/%x)\n", + __func__, start, chunk); + if (chunk <= 1024 << MIN_OCQP_SHIFT) { + printk(KERN_WARNING MOD + "Failed to add all OCQP chunks (%x/%x)\n", + start, top - start); + return 0; + } + chunk >>= 1; + } else { + PDBG("%s added OCQP chunk (%x/%x)\n", + __func__, start, chunk); + start += chunk; + } + } + return 0; +} + +void c4iw_ocqp_pool_destroy(struct c4iw_rdev *rdev) +{ + gen_pool_destroy(rdev->ocqp_pool); +} |