[PATCH v11 rdma-next 5/7] RDMA/qedr: Use the common mmap API

Michal Kalderon
2019-09-05T10:03:14Z

Remove all function related to mmap from qedr and use the common
API

Signed-off-by: Ariel Elior <ariel.elior@marvell.com>
Signed-off-by: Michal Kalderon <michal.kalderon@marvell.com>
---
drivers/infiniband/hw/qedr/main.c | 1 +
drivers/infiniband/hw/qedr/qedr.h | 28 +++---
drivers/infiniband/hw/qedr/verbs.c | 196 ++++++++++++++++++-------------------
drivers/infiniband/hw/qedr/verbs.h | 3 +-
4 files changed, 111 insertions(+), 117 deletions(-)

diff --git a/drivers/infiniband/hw/qedr/main.c b/drivers/infiniband/hw/qedr/main.c
index 5136b835e1ba..aab269602284 100644
--- a/drivers/infiniband/hw/qedr/main.c
+++ b/drivers/infiniband/hw/qedr/main.c
@@ -212,6 +212,7 @@ static const struct ib_device_ops qedr_dev_ops = {
.get_link_layer = qedr_link_layer,
.map_mr_sg = qedr_map_mr_sg,
.mmap = qedr_mmap,
+ .mmap_free = qedr_mmap_free,
.modify_port = qedr_modify_port,
.modify_qp = qedr_modify_qp,
.modify_srq = qedr_modify_srq,
diff --git a/drivers/infiniband/hw/qedr/qedr.h b/drivers/infiniband/hw/qedr/qedr.h
index 0cfd849b13d6..f273906fca19 100644
--- a/drivers/infiniband/hw/qedr/qedr.h
+++ b/drivers/infiniband/hw/qedr/qedr.h
@@ -230,14 +230,10 @@ struct qedr_ucontext {
struct qedr_dev *dev;
struct qedr_pd *pd;
void __iomem *dpi_addr;
+ u64 db_key;
u64 dpi_phys_addr;
u32 dpi_size;
u16 dpi;
-
- struct list_head mm_head;
-
- /* Lock to protect mm list */
- struct mutex mm_list_lock;
};

union db_prod64 {
@@ -300,14 +296,6 @@ struct qedr_pd {
struct qedr_ucontext *uctx;
};

-struct qedr_mm {
- struct {
- u64 phy_addr;
- unsigned long len;
- } key;
- struct list_head entry;
-};
-
union db_prod32 {
struct rdma_pwm_val16_data data;
u32 raw;
@@ -476,6 +464,13 @@ struct qedr_mr {
u32 npages;
};

+struct qedr_user_mmap_entry {
+ struct rdma_user_mmap_entry rdma_entry;
+ u64 address;
+ size_t length;
+ u8 mmap_flag;
+};
+
#define SET_FIELD2(value, name, flag) ((value) |= ((flag) << (name ## _SHIFT)))

#define QEDR_RESP_IMM (RDMA_CQE_RESPONDER_IMM_FLG_MASK << \
@@ -574,4 +569,11 @@ static inline struct qedr_srq *get_qedr_srq(struct ib_srq *ibsrq)
{
return container_of(ibsrq, struct qedr_srq, ibsrq);
}
+
+static inline struct qedr_user_mmap_entry *
+get_qedr_mmap_entry(struct rdma_user_mmap_entry *rdma_entry)
+{
+ return container_of(rdma_entry, struct qedr_user_mmap_entry,
+ rdma_entry);
+}
#endif
diff --git a/drivers/infiniband/hw/qedr/verbs.c b/drivers/infiniband/hw/qedr/verbs.c
index 6f3ce86019b7..b796ce2c78bc 100644
--- a/drivers/infiniband/hw/qedr/verbs.c
+++ b/drivers/infiniband/hw/qedr/verbs.c
@@ -58,6 +58,10 @@

#define DB_ADDR_SHIFT(addr) ((addr) << DB_PWM_ADDR_OFFSET_SHIFT)

+enum {
+ QEDR_USER_MMAP_IO_WC = 0,
+};
+
static inline int qedr_ib_copy_to_udata(struct ib_udata *udata, void *src,
size_t len)
{
@@ -256,60 +260,6 @@ int qedr_modify_port(struct ib_device *ibdev, u8 port, int mask,
return 0;
}

-static int qedr_add_mmap(struct qedr_ucontext *uctx, u64 phy_addr,
- unsigned long len)
-{
- struct qedr_mm *mm;
-
- mm = kzalloc(sizeof(*mm), GFP_KERNEL);
- if (!mm)
- return -ENOMEM;
-
- mm->key.phy_addr = phy_addr;
- /* This function might be called with a length which is not a multiple
- * of PAGE_SIZE, while the mapping is PAGE_SIZE grained and the kernel
- * forces this granularity by increasing the requested size if needed.
- * When qedr_mmap is called, it will search the list with the updated
- * length as a key. To prevent search failures, the length is rounded up
- * in advance to PAGE_SIZE.
- */
- mm->key.len = roundup(len, PAGE_SIZE);
- INIT_LIST_HEAD(&mm->entry);
-
- mutex_lock(&uctx->mm_list_lock);
- list_add(&mm->entry, &uctx->mm_head);
- mutex_unlock(&uctx->mm_list_lock);
-
- DP_DEBUG(uctx->dev, QEDR_MSG_MISC,
- "added (addr=0x%llx,len=0x%lx) for ctx=%p\n",
- (unsigned long long)mm->key.phy_addr,
- (unsigned long)mm->key.len, uctx);
-
- return 0;
-}
-
-static bool qedr_search_mmap(struct qedr_ucontext *uctx, u64 phy_addr,
- unsigned long len)
-{
- bool found = false;
- struct qedr_mm *mm;
-
- mutex_lock(&uctx->mm_list_lock);
- list_for_each_entry(mm, &uctx->mm_head, entry) {
- if (len != mm->key.len || phy_addr != mm->key.phy_addr)
- continue;
-
- found = true;
- break;
- }
- mutex_unlock(&uctx->mm_list_lock);
- DP_DEBUG(uctx->dev, QEDR_MSG_MISC,
- "searched for (addr=0x%llx,len=0x%lx) for ctx=%p, result=%d\n",
- mm->key.phy_addr, mm->key.len, uctx, found);
-
- return found;
-}
-
int qedr_alloc_ucontext(struct ib_ucontext *uctx, struct ib_udata *udata)
{
struct ib_device *ibdev = uctx->device;
@@ -318,6 +268,7 @@ int qedr_alloc_ucontext(struct ib_ucontext *uctx, struct ib_udata *udata)
struct qedr_alloc_ucontext_resp uresp = {};
struct qedr_dev *dev = get_qedr_dev(ibdev);
struct qed_rdma_add_user_out_params oparams;
+ struct qedr_user_mmap_entry *entry;

if (!udata)
return -EFAULT;
@@ -334,13 +285,27 @@ int qedr_alloc_ucontext(struct ib_ucontext *uctx, struct ib_udata *udata)
ctx->dpi_addr = oparams.dpi_addr;
ctx->dpi_phys_addr = oparams.dpi_phys_addr;
ctx->dpi_size = oparams.dpi_size;
- INIT_LIST_HEAD(&ctx->mm_head);
- mutex_init(&ctx->mm_list_lock);
+ entry = kzalloc(sizeof(*entry), GFP_KERNEL);
+ if (!entry) {
+ rc = -ENOMEM;
+ goto err;
+ }
+
+ entry->address = ctx->dpi_phys_addr;
+ entry->length = ctx->dpi_size;
+ entry->mmap_flag = QEDR_USER_MMAP_IO_WC;
+ ctx->db_key = rdma_user_mmap_entry_insert(uctx, &entry->rdma_entry,
+ ctx->dpi_size);
+ if (ctx->db_key == RDMA_USER_MMAP_INVALID) {
+ rc = -ENOMEM;
+ kfree(entry);
+ goto err;
+ }

uresp.dpm_enabled = dev->user_dpm_enabled;
uresp.wids_enabled = 1;
uresp.wid_count = oparams.wid_count;
- uresp.db_pa = ctx->dpi_phys_addr;
+ uresp.db_pa = ctx->db_key;
uresp.db_size = ctx->dpi_size;
uresp.max_send_wr = dev->attr.max_sqe;
uresp.max_recv_wr = dev->attr.max_rqe;
@@ -352,82 +317,107 @@ int qedr_alloc_ucontext(struct ib_ucontext *uctx, struct ib_udata *udata)

rc = qedr_ib_copy_to_udata(udata, &uresp, sizeof(uresp));
if (rc)
- return rc;
+ goto err1;

ctx->dev = dev;

- rc = qedr_add_mmap(ctx, ctx->dpi_phys_addr, ctx->dpi_size);
- if (rc)
- return rc;
-
DP_DEBUG(dev, QEDR_MSG_INIT, "Allocating user context %p\n",
&ctx->ibucontext);
return 0;
+
+err1:
+ rdma_user_mmap_entry_remove(uctx, ctx->db_key);
+err:
+ dev->ops->rdma_remove_user(dev->rdma_ctx, ctx->dpi);
+ return rc;
}

void qedr_dealloc_ucontext(struct ib_ucontext *ibctx)
{
struct qedr_ucontext *uctx = get_qedr_ucontext(ibctx);
- struct qedr_mm *mm, *tmp;

DP_DEBUG(uctx->dev, QEDR_MSG_INIT, "Deallocating user context %p\n",
uctx);
- uctx->dev->ops->rdma_remove_user(uctx->dev->rdma_ctx, uctx->dpi);

- list_for_each_entry_safe(mm, tmp, &uctx->mm_head, entry) {
- DP_DEBUG(uctx->dev, QEDR_MSG_MISC,
- "deleted (addr=0x%llx,len=0x%lx) for ctx=%p\n",
- mm->key.phy_addr, mm->key.len, uctx);
- list_del(&mm->entry);
- kfree(mm);
- }
+ rdma_user_mmap_entry_remove(ibctx, uctx->db_key);
+ uctx->dev->ops->rdma_remove_user(uctx->dev->rdma_ctx, uctx->dpi);
}

-int qedr_mmap(struct ib_ucontext *context, struct vm_area_struct *vma)
+void qedr_mmap_free(struct rdma_user_mmap_entry *rdma_entry)
{
- struct qedr_ucontext *ucontext = get_qedr_ucontext(context);
- struct qedr_dev *dev = get_qedr_dev(context->device);
- unsigned long phys_addr = vma->vm_pgoff << PAGE_SHIFT;
- unsigned long len = (vma->vm_end - vma->vm_start);
- unsigned long dpi_start;
+ struct qedr_user_mmap_entry *entry = get_qedr_mmap_entry(rdma_entry);

- dpi_start = dev->db_phys_addr + (ucontext->dpi * ucontext->dpi_size);
-
- DP_DEBUG(dev, QEDR_MSG_INIT,
- "mmap invoked with vm_start=0x%pK, vm_end=0x%pK,vm_pgoff=0x%pK; dpi_start=0x%pK dpi_size=0x%x\n",
- (void *)vma->vm_start, (void *)vma->vm_end,
- (void *)vma->vm_pgoff, (void *)dpi_start, ucontext->dpi_size);
+ kfree(entry);
+}

- if ((vma->vm_start & (PAGE_SIZE - 1)) || (len & (PAGE_SIZE - 1))) {
- DP_ERR(dev,
- "failed mmap, addresses must be page aligned: start=0x%pK, end=0x%pK\n",
- (void *)vma->vm_start, (void *)vma->vm_end);
+int qedr_mmap(struct ib_ucontext *ucontext, struct vm_area_struct *vma)
+{
+ struct ib_device *dev = ucontext->device;
+ size_t length = vma->vm_end - vma->vm_start;
+ u64 key = vma->vm_pgoff << PAGE_SHIFT;
+ struct rdma_user_mmap_entry *rdma_entry;
+ struct qedr_user_mmap_entry *entry;
+ u64 pfn;
+ int err;
+
+ ibdev_dbg(dev,
+ "start %#lx, end %#lx, length = %#zx, key = %#llx\n",
+ vma->vm_start, vma->vm_end, length, key);
+
+ if (length % PAGE_SIZE != 0 || !(vma->vm_flags & VM_SHARED)) {
+ ibdev_dbg(dev,
+ "length[%#zx] is not page size aligned[%#lx] or VM_SHARED is not set [%#lx]\n",
+ length, PAGE_SIZE, vma->vm_flags);
return -EINVAL;
}

- if (!qedr_search_mmap(ucontext, phys_addr, len)) {
- DP_ERR(dev, "failed mmap, vm_pgoff=0x%lx is not authorized\n",
- vma->vm_pgoff);
- return -EINVAL;
+ if (vma->vm_flags & VM_EXEC) {
+ ibdev_dbg(dev, "Mapping executable pages is not permitted\n");
+ return -EPERM;
}
+ vma->vm_flags &= ~VM_MAYEXEC;

- if (phys_addr < dpi_start ||
- ((phys_addr + len) > (dpi_start + ucontext->dpi_size))) {
- DP_ERR(dev,
- "failed mmap, pages are outside of dpi; page address=0x%pK, dpi_start=0x%pK, dpi_size=0x%x\n",
- (void *)phys_addr, (void *)dpi_start,
- ucontext->dpi_size);
+ rdma_entry = rdma_user_mmap_entry_get(ucontext, key, length, vma);
+ if (!rdma_entry) {
+ ibdev_dbg(dev, "key[%#llx] does not have valid entry\n",
+ key);
return -EINVAL;
}
+ entry = get_qedr_mmap_entry(rdma_entry);
+ if (entry->length != length) {
+ ibdev_dbg(dev,
+ "key[%#llx] does not have valid length[%#zx] expected[%#zx]\n",
+ key, length, entry->length);
+ err = -EINVAL;
+ goto err;
+ }

- if (vma->vm_flags & VM_READ) {
- DP_ERR(dev, "failed mmap, cannot map doorbell bar for read\n");
- return -EINVAL;
+ ibdev_dbg(dev,
+ "Mapping address[%#llx], length[%#zx], mmap_flag[%d]\n",
+ entry->address, length, entry->mmap_flag);
+
+ pfn = entry->address >> PAGE_SHIFT;
+ switch (entry->mmap_flag) {
+ case QEDR_USER_MMAP_IO_WC:
+ err = rdma_user_mmap_io(ucontext, vma, pfn, length,
+ pgprot_writecombine(vma->vm_page_prot));
+ break;
+ default:
+ err = -EINVAL;
+ }
+
+ if (err) {
+ ibdev_dbg(dev,
+ "Couldn't mmap address[%#llx] length[%#zx] mmap_flag[%d] err[%d]\n",
+ entry->address, length, entry->mmap_flag, err);
+ goto err;
}

- vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
- return io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, len,
- vma->vm_page_prot);
+ return 0;
+
+err:
+ rdma_user_mmap_entry_put(ucontext, rdma_entry);
+ return err;
}

int qedr_alloc_pd(struct ib_pd *ibpd, struct ib_udata *udata)
diff --git a/drivers/infiniband/hw/qedr/verbs.h b/drivers/infiniband/hw/qedr/verbs.h
index 9aaa90283d6e..3606e97e95da 100644
--- a/drivers/infiniband/hw/qedr/verbs.h
+++ b/drivers/infiniband/hw/qedr/verbs.h
@@ -46,7 +46,8 @@ int qedr_query_pkey(struct ib_device *, u8 port, u16 index, u16 *pkey);
int qedr_alloc_ucontext(struct ib_ucontext *uctx, struct ib_udata *udata);
void qedr_dealloc_ucontext(struct ib_ucontext *uctx);

-int qedr_mmap(struct ib_ucontext *, struct vm_area_struct *vma);
+int qedr_mmap(struct ib_ucontext *ucontext, struct vm_area_struct *vma);
+void qedr_mmap_free(struct rdma_user_mmap_entry *rdma_entry);
int qedr_alloc_pd(struct ib_pd *pd, struct ib_udata *udata);
void qedr_dealloc_pd(struct ib_pd *pd, struct ib_udata *udata);

--
2.14.5