[v3,2/3] cnic,bnx2,bnx2x: use UIO_MEM_DMA_COHERENT

Commit Message

Nilesh Javali Jan. 9, 2024, 12:14 p.m. UTC

From: Chris Leech <[e-mail]>

Use new UIO_MEM_DMA_COHERENT type to properly handle
mmap for dma_alloc_coherent buffers.

The cnic l2_ring and l2_buf mmaps have caused page
refcount issues as the dma_alloc_coherent no more
provide __GFP_COMP allocation as per commit,
dma-mapping: reject __GFP_COMP in dma_alloc_attrs.

Fix this by having the uio device use dma_mmap_coherent.

The bnx2 and bnx2x status block allocations are also dma_alloc_coherent,
and should use dma_mmap_coherent. They didn't allocate multiple pages,
but also didn't seem to work correctly with an iommu enabled.

Reported-by: kernel test robot <[e-mail]>
Closes: https://lore.kernel.org/oe-kbuild-all/[e-mail]/
Fixes: bb73955c0b1d ("cnic: don't pass bogus GFP_ flags to dma_alloc_coherent")
Signed-off-by: Nilesh Javali <[e-mail]>
Signed-off-by: Chris Leech <[e-mail]>
---
v3:
- fix warnings reported by kernel test robot
v2:
- expose only the dma_addr from cnic to uio
- Cleanup newly added unions comprising virtual_addr
  and struct device
 drivers/net/ethernet/broadcom/bnx2.c             |  1 +
 drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c |  2 ++
 drivers/net/ethernet/broadcom/cnic.c             | 12 +++++++++---
 drivers/net/ethernet/broadcom/cnic.h             |  1 +
 drivers/net/ethernet/broadcom/cnic_if.h          |  1 +
 5 files changed, 14 insertions(+), 3 deletions(-)

Patch

diff --git a/drivers/net/ethernet/broadcom/bnx2.c b/drivers/net/ethernet/broadcom/bnx2.c
index 0d917a9699c5..b65b8592ad75 100644
--- a/drivers/net/ethernet/broadcom/bnx2.c
+++ b/drivers/net/ethernet/broadcom/bnx2.c
@@ -367,6 +367,7 @@  static void bnx2_setup_cnic_irq_info(struct bnx2 *bp)
 	cp->irq_arr[0].status_blk = (void *)
 		((unsigned long) bnapi->status_blk.msi +
 		(BNX2_SBLK_MSIX_ALIGN_SIZE * sb_id));
+	cp->irq_arr[0].status_blk_map = bp->status_blk_mapping;
 	cp->irq_arr[0].status_blk_num = sb_id;
 	cp->num_irq = 1;
 }
diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
index 0d8e61c63c7c..678829646cec 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
@@ -14912,9 +14912,11 @@  void bnx2x_setup_cnic_irq_info(struct bnx2x *bp)
 	else
 		cp->irq_arr[0].status_blk = (void *)bp->cnic_sb.e1x_sb;
 
+	cp->irq_arr[0].status_blk_map = bp->cnic_sb_mapping;
 	cp->irq_arr[0].status_blk_num =  bnx2x_cnic_fw_sb_id(bp);
 	cp->irq_arr[0].status_blk_num2 = bnx2x_cnic_igu_sb_id(bp);
 	cp->irq_arr[1].status_blk = bp->def_status_blk;
+	cp->irq_arr[1].status_blk_map = bp->def_status_blk_mapping;
 	cp->irq_arr[1].status_blk_num = DEF_SB_ID;
 	cp->irq_arr[1].status_blk_num2 = DEF_SB_IGU_ID;
 
diff --git a/drivers/net/ethernet/broadcom/cnic.c b/drivers/net/ethernet/broadcom/cnic.c
index 7926aaef8f0c..e2069a984764 100644
--- a/drivers/net/ethernet/broadcom/cnic.c
+++ b/drivers/net/ethernet/broadcom/cnic.c
@@ -1107,6 +1107,7 @@  static int cnic_init_uio(struct cnic_dev *dev)
 						     TX_MAX_TSS_RINGS + 1);
 		uinfo->mem[1].addr = (unsigned long) cp->status_blk.gen &
 					CNIC_PAGE_MASK;
+		uinfo->mem[1].dma_addr = cp->status_blk_map;
 		if (cp->ethdev->drv_state & CNIC_DRV_STATE_USING_MSIX)
 			uinfo->mem[1].size = BNX2_SBLK_MSIX_ALIGN_SIZE * 9;
 		else
@@ -1118,20 +1119,23 @@  static int cnic_init_uio(struct cnic_dev *dev)
 
 		uinfo->mem[1].addr = (unsigned long) cp->bnx2x_def_status_blk &
 			CNIC_PAGE_MASK;
+		uinfo->mem[1].dma_addr = cp->status_blk_map;
 		uinfo->mem[1].size = sizeof(*cp->bnx2x_def_status_blk);
 
 		uinfo->name = "bnx2x_cnic";
 	}
 
-	uinfo->mem[1].memtype = UIO_MEM_LOGICAL;
+	uinfo->mem[1].memtype = UIO_MEM_DMA_COHERENT;
 
 	uinfo->mem[2].addr = (unsigned long) udev->l2_ring;
+	uinfo->mem[2].dma_addr = udev->l2_ring_map;
 	uinfo->mem[2].size = udev->l2_ring_size;
-	uinfo->mem[2].memtype = UIO_MEM_LOGICAL;
+	uinfo->mem[2].memtype = UIO_MEM_DMA_COHERENT;
 
 	uinfo->mem[3].addr = (unsigned long) udev->l2_buf;
+	uinfo->mem[3].dma_addr = udev->l2_buf_map;
 	uinfo->mem[3].size = udev->l2_buf_size;
-	uinfo->mem[3].memtype = UIO_MEM_LOGICAL;
+	uinfo->mem[3].memtype = UIO_MEM_DMA_COHERENT;
 
 	uinfo->version = CNIC_MODULE_VERSION;
 	uinfo->irq = UIO_IRQ_CUSTOM;
@@ -1313,6 +1317,7 @@  static int cnic_alloc_bnx2x_resc(struct cnic_dev *dev)
 		return 0;
 
 	cp->bnx2x_def_status_blk = cp->ethdev->irq_arr[1].status_blk;
+	cp->status_blk_map = cp->ethdev->irq_arr[1].status_blk_map;
 
 	cp->l2_rx_ring_size = 15;
 
@@ -5323,6 +5328,7 @@  static int cnic_start_hw(struct cnic_dev *dev)
 	pci_dev_get(dev->pcidev);
 	cp->func = PCI_FUNC(dev->pcidev->devfn);
 	cp->status_blk.gen = ethdev->irq_arr[0].status_blk;
+	cp->status_blk_map = ethdev->irq_arr[0].status_blk_map;
 	cp->status_blk_num = ethdev->irq_arr[0].status_blk_num;
 
 	err = cp->alloc_resc(dev);
diff --git a/drivers/net/ethernet/broadcom/cnic.h b/drivers/net/ethernet/broadcom/cnic.h
index 4baea81bae7a..fedc84ada937 100644
--- a/drivers/net/ethernet/broadcom/cnic.h
+++ b/drivers/net/ethernet/broadcom/cnic.h
@@ -260,6 +260,7 @@  struct cnic_local {
 		#define SM_RX_ID		0
 		#define SM_TX_ID		1
 	} status_blk;
+	dma_addr_t status_blk_map;
 
 	struct host_sp_status_block	*bnx2x_def_status_blk;
 
diff --git a/drivers/net/ethernet/broadcom/cnic_if.h b/drivers/net/ethernet/broadcom/cnic_if.h
index 789e5c7e9311..49a11ec80b36 100644
--- a/drivers/net/ethernet/broadcom/cnic_if.h
+++ b/drivers/net/ethernet/broadcom/cnic_if.h
@@ -190,6 +190,7 @@  struct cnic_ops {
 struct cnic_irq {
 	unsigned int	vector;
 	void		*status_blk;
+	dma_addr_t	status_blk_map;
 	u32		status_blk_num;
 	u32		status_blk_num2;
 	u32		irq_flags;