cnic,bnx2,bnx2x: use UIO_MEM_DMA_COHERENT

JIRA: https://issues.redhat.com/browse/RHEL-26081
Upstream Status: Posted https://lore.kernel.org/all/20240201233400.3394996-1-cleech@redhat.com/

Author: Chris Leech <cleech@redhat.com>
Date:   Thu Feb 1 15:33:58 2024 -0800

    cnic,bnx2,bnx2x: use UIO_MEM_DMA_COHERENT

    Use the 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 longer 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 don't allocate multiple pages,
    but this interface does not work correctly with an iommu enabled unless
    dma_mmap_coherent is used.

    Signed-off-by: Nilesh Javali <njavali@marvell.com>
    Acked-by: Jakub Kicinski <kuba@kernel.org>
    Signed-off-by: Chris Leech <cleech@redhat.com>

Signed-off-by: Chris Leech <cleech@redhat.com>

Author: cleech

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;
 }

drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c

@@ -14900,9 +14900,11 @@ 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;
 

drivers/net/ethernet/broadcom/cnic.c

@@ -1107,31 +1107,38 @@ 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;
+			uinfo->mem[1].size = PAGE_ALIGN(BNX2_SBLK_MSIX_ALIGN_SIZE * 9);
 		else
-			uinfo->mem[1].size = BNX2_SBLK_MSIX_ALIGN_SIZE;
+			uinfo->mem[1].size = PAGE_ALIGN(BNX2_SBLK_MSIX_ALIGN_SIZE);
 
 		uinfo->name = "bnx2_cnic";
 	} else if (test_bit(CNIC_F_BNX2X_CLASS, &dev->flags)) {
 		uinfo->mem[0].size = pci_resource_len(dev->pcidev, 0);
 
 		uinfo->mem[1].addr = (unsigned long) cp->bnx2x_def_status_blk &
 			CNIC_PAGE_MASK;
-		uinfo->mem[1].size = sizeof(*cp->bnx2x_def_status_blk);
+		uinfo->mem[1].dma_addr = cp->status_blk_map;
+		uinfo->mem[1].size = PAGE_ALIGN(sizeof(*cp->bnx2x_def_status_blk));
 
 		uinfo->name = "bnx2x_cnic";
 	}
 
-	uinfo->mem[1].memtype = UIO_MEM_LOGICAL;
+	uinfo->mem[1].dma_device = &dev->pcidev->dev;
+	uinfo->mem[1].memtype = UIO_MEM_DMA_COHERENT;
 
 	uinfo->mem[2].addr = (unsigned long) udev->l2_ring;
-	uinfo->mem[2].size = udev->l2_ring_size;
-	uinfo->mem[2].memtype = UIO_MEM_LOGICAL;
+	uinfo->mem[2].dma_addr = udev->l2_ring_map;
+	uinfo->mem[2].size = PAGE_ALIGN(udev->l2_ring_size);
+	uinfo->mem[2].dma_device = &dev->pcidev->dev;
+	uinfo->mem[2].memtype = UIO_MEM_DMA_COHERENT;
 
 	uinfo->mem[3].addr = (unsigned long) udev->l2_buf;
-	uinfo->mem[3].size = udev->l2_buf_size;
-	uinfo->mem[3].memtype = UIO_MEM_LOGICAL;
+	uinfo->mem[3].dma_addr = udev->l2_buf_map;
+	uinfo->mem[3].size = PAGE_ALIGN(udev->l2_buf_size);
+	uinfo->mem[3].dma_device = &dev->pcidev->dev;
+	uinfo->mem[3].memtype = UIO_MEM_DMA_COHERENT;
 
 	uinfo->version = CNIC_MODULE_VERSION;
 	uinfo->irq = UIO_IRQ_CUSTOM;
@@ -1313,6 +1320,7 @@ 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;
 
@@ -5324,6 +5332,7 @@ 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);

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;
 

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;