mlx5: Support communicating arbitrary host page size to firmware
Connect-IB firmware requires 4K pages to be communicated with the
driver. This patch breaks larger pages to 4K units to enable support
for architectures utilizing larger page size, such as PowerPC. This
patch also fixes several places that referred to PAGE_SHIFT instead of
explicit 12 which is the inherent page shift on Connect-IB.
Signed-off-by: Eli Cohen <eli@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
diff --git a/drivers/infiniband/hw/mlx5/cq.c b/drivers/infiniband/hw/mlx5/cq.c
index 8459186..eecac7b 100644
--- a/drivers/infiniband/hw/mlx5/cq.c
+++ b/drivers/infiniband/hw/mlx5/cq.c
@@ -620,7 +620,7 @@
}
mlx5_fill_page_array(&cq->buf.buf, (*cqb)->pas);
- (*cqb)->ctx.log_pg_sz = cq->buf.buf.page_shift - PAGE_SHIFT;
+ (*cqb)->ctx.log_pg_sz = cq->buf.buf.page_shift - 12;
*index = dev->mdev.priv.uuari.uars[0].index;
return 0;
diff --git a/drivers/infiniband/hw/mlx5/qp.c b/drivers/infiniband/hw/mlx5/qp.c
index 8a36fd7..ce14008 100644
--- a/drivers/infiniband/hw/mlx5/qp.c
+++ b/drivers/infiniband/hw/mlx5/qp.c
@@ -551,7 +551,7 @@
}
mlx5_ib_populate_pas(dev, qp->umem, page_shift, (*in)->pas, 0);
(*in)->ctx.log_pg_sz_remote_qpn =
- cpu_to_be32((page_shift - PAGE_SHIFT) << 24);
+ cpu_to_be32((page_shift - 12) << 24);
(*in)->ctx.params2 = cpu_to_be32(offset << 6);
(*in)->ctx.qp_counter_set_usr_page = cpu_to_be32(uar_index);
@@ -648,7 +648,7 @@
goto err_buf;
}
(*in)->ctx.qp_counter_set_usr_page = cpu_to_be32(uar_index);
- (*in)->ctx.log_pg_sz_remote_qpn = cpu_to_be32((qp->buf.page_shift - PAGE_SHIFT) << 24);
+ (*in)->ctx.log_pg_sz_remote_qpn = cpu_to_be32((qp->buf.page_shift - 12) << 24);
/* Set "fast registration enabled" for all kernel QPs */
(*in)->ctx.params1 |= cpu_to_be32(1 << 11);
(*in)->ctx.sq_crq_size |= cpu_to_be16(1 << 4);
diff --git a/drivers/infiniband/hw/mlx5/srq.c b/drivers/infiniband/hw/mlx5/srq.c
index f1e5845..dbc2c71 100644
--- a/drivers/infiniband/hw/mlx5/srq.c
+++ b/drivers/infiniband/hw/mlx5/srq.c
@@ -123,7 +123,7 @@
goto err_in;
}
- (*in)->ctx.log_pg_sz = page_shift - PAGE_SHIFT;
+ (*in)->ctx.log_pg_sz = page_shift - 12;
(*in)->ctx.pgoff_cqn = cpu_to_be32(offset << 26);
return 0;
@@ -192,7 +192,7 @@
}
srq->wq_sig = !!srq_signature;
- (*in)->ctx.log_pg_sz = page_shift - PAGE_SHIFT;
+ (*in)->ctx.log_pg_sz = page_shift - 12;
return 0;
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/eq.c b/drivers/net/ethernet/mellanox/mlx5/core/eq.c
index 2231d93..6b4b4368 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/eq.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/eq.c
@@ -354,7 +354,7 @@
in->hdr.opcode = cpu_to_be16(MLX5_CMD_OP_CREATE_EQ);
in->ctx.log_sz_usr_page = cpu_to_be32(ilog2(eq->nent) << 24 | uar->index);
in->ctx.intr = vecidx;
- in->ctx.log_page_size = PAGE_SHIFT - 12;
+ in->ctx.log_page_size = eq->buf.page_shift - 12;
in->events_mask = cpu_to_be64(mask);
err = mlx5_cmd_exec(dev, in, inlen, &out, sizeof(out));
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/pagealloc.c b/drivers/net/ethernet/mellanox/mlx5/core/pagealloc.c
index a0d0da3..013aa42 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/pagealloc.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/pagealloc.c
@@ -57,10 +57,13 @@
};
struct fw_page {
- struct rb_node rb_node;
- u64 addr;
- struct page *page;
- u16 func_id;
+ struct rb_node rb_node;
+ u64 addr;
+ struct page *page;
+ u16 func_id;
+ unsigned long bitmask;
+ struct list_head list;
+ unsigned free_count;
};
struct mlx5_query_pages_inbox {
@@ -94,6 +97,11 @@
MAX_RECLAIM_TIME_MSECS = 5000,
};
+enum {
+ MLX5_MAX_RECLAIM_TIME_MILI = 5000,
+ MLX5_NUM_4K_IN_PAGE = PAGE_SIZE / 4096,
+};
+
static int insert_page(struct mlx5_core_dev *dev, u64 addr, struct page *page, u16 func_id)
{
struct rb_root *root = &dev->priv.page_root;
@@ -101,6 +109,7 @@
struct rb_node *parent = NULL;
struct fw_page *nfp;
struct fw_page *tfp;
+ int i;
while (*new) {
parent = *new;
@@ -113,25 +122,29 @@
return -EEXIST;
}
- nfp = kmalloc(sizeof(*nfp), GFP_KERNEL);
+ nfp = kzalloc(sizeof(*nfp), GFP_KERNEL);
if (!nfp)
return -ENOMEM;
nfp->addr = addr;
nfp->page = page;
nfp->func_id = func_id;
+ nfp->free_count = MLX5_NUM_4K_IN_PAGE;
+ for (i = 0; i < MLX5_NUM_4K_IN_PAGE; i++)
+ set_bit(i, &nfp->bitmask);
rb_link_node(&nfp->rb_node, parent, new);
rb_insert_color(&nfp->rb_node, root);
+ list_add(&nfp->list, &dev->priv.free_list);
return 0;
}
-static struct page *remove_page(struct mlx5_core_dev *dev, u64 addr)
+static struct fw_page *find_fw_page(struct mlx5_core_dev *dev, u64 addr)
{
struct rb_root *root = &dev->priv.page_root;
struct rb_node *tmp = root->rb_node;
- struct page *result = NULL;
+ struct fw_page *result = NULL;
struct fw_page *tfp;
while (tmp) {
@@ -141,9 +154,7 @@
} else if (tfp->addr > addr) {
tmp = tmp->rb_right;
} else {
- rb_erase(&tfp->rb_node, root);
- result = tfp->page;
- kfree(tfp);
+ result = tfp;
break;
}
}
@@ -176,13 +187,97 @@
return err;
}
+static int alloc_4k(struct mlx5_core_dev *dev, u64 *addr)
+{
+ struct fw_page *fp;
+ unsigned n;
+
+ if (list_empty(&dev->priv.free_list)) {
+ return -ENOMEM;
+ mlx5_core_warn(dev, "\n");
+ }
+
+ fp = list_entry(dev->priv.free_list.next, struct fw_page, list);
+ n = find_first_bit(&fp->bitmask, 8 * sizeof(fp->bitmask));
+ if (n >= MLX5_NUM_4K_IN_PAGE) {
+ mlx5_core_warn(dev, "alloc 4k bug\n");
+ return -ENOENT;
+ }
+ clear_bit(n, &fp->bitmask);
+ fp->free_count--;
+ if (!fp->free_count)
+ list_del(&fp->list);
+
+ *addr = fp->addr + n * 4096;
+
+ return 0;
+}
+
+static void free_4k(struct mlx5_core_dev *dev, u64 addr)
+{
+ struct fw_page *fwp;
+ int n;
+
+ fwp = find_fw_page(dev, addr & PAGE_MASK);
+ if (!fwp) {
+ mlx5_core_warn(dev, "page not found\n");
+ return;
+ }
+
+ n = (addr & ~PAGE_MASK) % 4096;
+ fwp->free_count++;
+ set_bit(n, &fwp->bitmask);
+ if (fwp->free_count == MLX5_NUM_4K_IN_PAGE) {
+ rb_erase(&fwp->rb_node, &dev->priv.page_root);
+ list_del(&fwp->list);
+ dma_unmap_page(&dev->pdev->dev, addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
+ __free_page(fwp->page);
+ kfree(fwp);
+ } else if (fwp->free_count == 1) {
+ list_add(&fwp->list, &dev->priv.free_list);
+ }
+}
+
+static int alloc_system_page(struct mlx5_core_dev *dev, u16 func_id)
+{
+ struct page *page;
+ u64 addr;
+ int err;
+
+ page = alloc_page(GFP_HIGHUSER);
+ if (!page) {
+ mlx5_core_warn(dev, "failed to allocate page\n");
+ return -ENOMEM;
+ }
+ addr = dma_map_page(&dev->pdev->dev, page, 0,
+ PAGE_SIZE, DMA_BIDIRECTIONAL);
+ if (dma_mapping_error(&dev->pdev->dev, addr)) {
+ mlx5_core_warn(dev, "failed dma mapping page\n");
+ err = -ENOMEM;
+ goto out_alloc;
+ }
+ err = insert_page(dev, addr, page, func_id);
+ if (err) {
+ mlx5_core_err(dev, "failed to track allocated page\n");
+ goto out_mapping;
+ }
+
+ return 0;
+
+out_mapping:
+ dma_unmap_page(&dev->pdev->dev, addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
+
+out_alloc:
+ __free_page(page);
+
+ return err;
+}
static int give_pages(struct mlx5_core_dev *dev, u16 func_id, int npages,
int notify_fail)
{
struct mlx5_manage_pages_inbox *in;
struct mlx5_manage_pages_outbox out;
struct mlx5_manage_pages_inbox *nin;
- struct page *page;
int inlen;
u64 addr;
int err;
@@ -197,27 +292,15 @@
memset(&out, 0, sizeof(out));
for (i = 0; i < npages; i++) {
- page = alloc_page(GFP_HIGHUSER);
- if (!page) {
- err = -ENOMEM;
- mlx5_core_warn(dev, "failed to allocate page\n");
- goto out_alloc;
- }
- addr = dma_map_page(&dev->pdev->dev, page, 0,
- PAGE_SIZE, DMA_BIDIRECTIONAL);
- if (dma_mapping_error(&dev->pdev->dev, addr)) {
- mlx5_core_warn(dev, "failed dma mapping page\n");
- __free_page(page);
- err = -ENOMEM;
- goto out_alloc;
- }
- err = insert_page(dev, addr, page, func_id);
+retry:
+ err = alloc_4k(dev, &addr);
if (err) {
- mlx5_core_err(dev, "failed to track allocated page\n");
- dma_unmap_page(&dev->pdev->dev, addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
- __free_page(page);
- err = -ENOMEM;
- goto out_alloc;
+ if (err == -ENOMEM)
+ err = alloc_system_page(dev, func_id);
+ if (err)
+ goto out_4k;
+
+ goto retry;
}
in->pas[i] = cpu_to_be64(addr);
}
@@ -227,7 +310,6 @@
in->func_id = cpu_to_be16(func_id);
in->num_entries = cpu_to_be32(npages);
err = mlx5_cmd_exec(dev, in, inlen, &out, sizeof(out));
- mlx5_core_dbg(dev, "err %d\n", err);
if (err) {
mlx5_core_warn(dev, "func_id 0x%x, npages %d, err %d\n", func_id, npages, err);
goto out_alloc;
@@ -251,7 +333,7 @@
nin = kzalloc(sizeof(*nin), GFP_KERNEL);
if (!nin) {
mlx5_core_warn(dev, "allocation failed\n");
- goto unmap;
+ goto out_4k;
}
memset(&out, 0, sizeof(out));
nin->hdr.opcode = cpu_to_be16(MLX5_CMD_OP_MANAGE_PAGES);
@@ -261,19 +343,9 @@
kfree(nin);
}
-unmap:
- for (i--; i >= 0; i--) {
- addr = be64_to_cpu(in->pas[i]);
- page = remove_page(dev, addr);
- if (!page) {
- mlx5_core_err(dev, "BUG: can't remove page at addr 0x%llx\n",
- addr);
- continue;
- }
- dma_unmap_page(&dev->pdev->dev, addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
- __free_page(page);
- }
-
+out_4k:
+ for (i--; i >= 0; i--)
+ free_4k(dev, be64_to_cpu(in->pas[i]));
out_free:
mlx5_vfree(in);
return err;
@@ -284,7 +356,6 @@
{
struct mlx5_manage_pages_inbox in;
struct mlx5_manage_pages_outbox *out;
- struct page *page;
int num_claimed;
int outlen;
u64 addr;
@@ -323,13 +394,7 @@
for (i = 0; i < num_claimed; i++) {
addr = be64_to_cpu(out->pas[i]);
- page = remove_page(dev, addr);
- if (!page) {
- mlx5_core_warn(dev, "FW reported unknown DMA address 0x%llx\n", addr);
- } else {
- dma_unmap_page(&dev->pdev->dev, addr, PAGE_SIZE, DMA_BIDIRECTIONAL);
- __free_page(page);
- }
+ free_4k(dev, addr);
}
out_free:
@@ -435,6 +500,7 @@
void mlx5_pagealloc_init(struct mlx5_core_dev *dev)
{
dev->priv.page_root = RB_ROOT;
+ INIT_LIST_HEAD(&dev->priv.free_list);
}
void mlx5_pagealloc_cleanup(struct mlx5_core_dev *dev)
diff --git a/include/linux/mlx5/driver.h b/include/linux/mlx5/driver.h
index 513619a..554548c 100644
--- a/include/linux/mlx5/driver.h
+++ b/include/linux/mlx5/driver.h
@@ -483,6 +483,7 @@
struct rb_root page_root;
int fw_pages;
int reg_pages;
+ struct list_head free_list;
struct mlx5_core_health health;