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Subject[PATCH 04/12] IB/ehca: Use remap_4k_pfn() to map firmware contexts to user space
Date
From: Hoang-Nam Nguyen <hnguyen@de.ibm.com>

Use Paul's new remap_4k_pfn() function to map our 4K firmware contexts into
user space on 64K-page machines without exposing neighboring firmware
contexts. Return the context's offset within a 64K page to user space so it
can determine the proper virtual address.

For details about remap_4k_pfn(), see commit 721151d0 or
http://patchwork.ozlabs.org/linuxppc/patch?id=10281

Signed-off-by: Joachim Fenkes <fenkes@de.ibm.com>
---
drivers/infiniband/hw/ehca/ehca_classes.h | 4 +++-
drivers/infiniband/hw/ehca/ehca_cq.c | 2 ++
drivers/infiniband/hw/ehca/ehca_qp.c | 2 ++
drivers/infiniband/hw/ehca/ehca_uverbs.c | 6 +++---
4 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/infiniband/hw/ehca/ehca_classes.h b/drivers/infiniband/hw/ehca/ehca_classes.h
index b5e9603..206d4eb 100644
--- a/drivers/infiniband/hw/ehca/ehca_classes.h
+++ b/drivers/infiniband/hw/ehca/ehca_classes.h
@@ -337,6 +337,8 @@ struct ehca_create_cq_resp {
u32 cq_number;
u32 token;
struct ipzu_queue_resp ipz_queue;
+ u32 fw_handle_ofs;
+ u32 dummy;
};

struct ehca_create_qp_resp {
@@ -347,7 +349,7 @@ struct ehca_create_qp_resp {
u32 qkey;
/* qp_num assigned by ehca: sqp0/1 may have got different numbers */
u32 real_qp_num;
- u32 dummy; /* padding for 8 byte alignment */
+ u32 fw_handle_ofs;
struct ipzu_queue_resp ipz_squeue;
struct ipzu_queue_resp ipz_rqueue;
};
diff --git a/drivers/infiniband/hw/ehca/ehca_cq.c b/drivers/infiniband/hw/ehca/ehca_cq.c
index a6f17e4..d68603d 100644
--- a/drivers/infiniband/hw/ehca/ehca_cq.c
+++ b/drivers/infiniband/hw/ehca/ehca_cq.c
@@ -281,6 +281,8 @@ struct ib_cq *ehca_create_cq(struct ib_device *device, int cqe, int comp_vector,
resp.ipz_queue.queue_length = ipz_queue->queue_length;
resp.ipz_queue.pagesize = ipz_queue->pagesize;
resp.ipz_queue.toggle_state = ipz_queue->toggle_state;
+ resp.fw_handle_ofs = (u32)
+ (my_cq->galpas.user.fw_handle & (PAGE_SIZE - 1));
if (ib_copy_to_udata(udata, &resp, sizeof(resp))) {
ehca_err(device, "Copy to udata failed.");
goto create_cq_exit4;
diff --git a/drivers/infiniband/hw/ehca/ehca_qp.c b/drivers/infiniband/hw/ehca/ehca_qp.c
index e886e3b..3a3880f 100644
--- a/drivers/infiniband/hw/ehca/ehca_qp.c
+++ b/drivers/infiniband/hw/ehca/ehca_qp.c
@@ -751,6 +751,8 @@ static struct ehca_qp *internal_create_qp(
queue2resp(&resp.ipz_squeue, &my_qp->ipz_squeue);
if (HAS_RQ(my_qp))
queue2resp(&resp.ipz_rqueue, &my_qp->ipz_rqueue);
+ resp.fw_handle_ofs = (u32)
+ (my_qp->galpas.user.fw_handle & (PAGE_SIZE - 1));

if (ib_copy_to_udata(udata, &resp, sizeof resp)) {
ehca_err(pd->device, "Copy to udata failed");
diff --git a/drivers/infiniband/hw/ehca/ehca_uverbs.c b/drivers/infiniband/hw/ehca/ehca_uverbs.c
index 3340f49..84a16bc 100644
--- a/drivers/infiniband/hw/ehca/ehca_uverbs.c
+++ b/drivers/infiniband/hw/ehca/ehca_uverbs.c
@@ -109,7 +109,7 @@ static int ehca_mmap_fw(struct vm_area_struct *vma, struct h_galpas *galpas,
u64 vsize, physical;

vsize = vma->vm_end - vma->vm_start;
- if (vsize != EHCA_PAGESIZE) {
+ if (vsize < EHCA_PAGESIZE) {
ehca_gen_err("invalid vsize=%lx", vma->vm_end - vma->vm_start);
return -EINVAL;
}
@@ -118,8 +118,8 @@ static int ehca_mmap_fw(struct vm_area_struct *vma, struct h_galpas *galpas,
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
ehca_gen_dbg("vsize=%lx physical=%lx", vsize, physical);
/* VM_IO | VM_RESERVED are set by remap_pfn_range() */
- ret = remap_pfn_range(vma, vma->vm_start, physical >> PAGE_SHIFT,
- vsize, vma->vm_page_prot);
+ ret = remap_4k_pfn(vma, vma->vm_start, physical >> EHCA_PAGESHIFT,
+ vma->vm_page_prot);
if (unlikely(ret)) {
ehca_gen_err("remap_pfn_range() failed ret=%x", ret);
return -ENOMEM;
--
1.5.2

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