linux-kernel - [PATCH v3 10/15] soc: octeontx2: Reconfig MSIX base with IOVA

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Message-Id: <1536078525-31534-11-git-send-email-sunil.kovvuri@gmail.com>
Date:   Tue,  4 Sep 2018 21:58:40 +0530
From:   sunil.kovvuri@...il.com
To:     linux-kernel@...r.kernel.org, arnd@...db.de, olof@...om.net
Cc:     linux-arm-kernel@...ts.infradead.org, linux-soc@...r.kernel.org,
        andrew@...n.ch, davem@...emloft.net, netdev@...r.kernel.org,
        Geetha sowjanya <gakula@...vell.com>,
        Sunil Goutham <sgoutham@...vell.com>
Subject: [PATCH v3 10/15] soc: octeontx2: Reconfig MSIX base with IOVA

From: Geetha sowjanya <gakula@...vell.com>

HW interprets RVU_AF_MSIXTR_BASE address as an IOVA, hence
create a IOMMU mapping for the physcial address configured by
firmware and reconfig RVU_AF_MSIXTR_BASE with IOVA.

Signed-off-by: Geetha sowjanya <gakula@...vell.com>
Signed-off-by: Sunil Goutham <sgoutham@...vell.com>
---
 drivers/soc/marvell/octeontx2/rvu.c | 33 ++++++++++++++++++++++++++++++---
 drivers/soc/marvell/octeontx2/rvu.h |  1 +
 2 files changed, 31 insertions(+), 3 deletions(-)

diff --git a/drivers/soc/marvell/octeontx2/rvu.c b/drivers/soc/marvell/octeontx2/rvu.c
index 8ac3524..40684c9 100644
--- a/drivers/soc/marvell/octeontx2/rvu.c
+++ b/drivers/soc/marvell/octeontx2/rvu.c
@@ -442,9 +442,10 @@ static int rvu_setup_msix_resources(struct rvu *rvu)
 {
 	struct rvu_hwinfo *hw = rvu->hw;
 	int pf, vf, numvfs, hwvf, err;
+	int nvecs, offset, max_msix;
 	struct rvu_pfvf *pfvf;
-	int nvecs, offset;
-	u64 cfg;
+	u64 cfg, phy_addr;
+	dma_addr_t iova;
 
 	for (pf = 0; pf < hw->total_pfs; pf++) {
 		cfg = rvu_read64(rvu, BLKADDR_RVUM, RVU_PRIV_PFX_CFG(pf));
@@ -523,6 +524,22 @@ static int rvu_setup_msix_resources(struct rvu *rvu)
 		}
 	}
 
+	/* HW interprets RVU_AF_MSIXTR_BASE address as an IOVA, hence
+	 * create a IOMMU mapping for the physcial address configured by
+	 * firmware and reconfig RVU_AF_MSIXTR_BASE with IOVA.
+	 */
+	cfg = rvu_read64(rvu, BLKADDR_RVUM, RVU_PRIV_CONST);
+	max_msix = cfg & 0xFFFFF;
+	phy_addr = rvu_read64(rvu, BLKADDR_RVUM, RVU_AF_MSIXTR_BASE);
+	iova = dma_map_single(rvu->dev, (void *)phy_addr,
+			      max_msix * PCI_MSIX_ENTRY_SIZE,
+			      DMA_BIDIRECTIONAL);
+	if (dma_mapping_error(rvu->dev, iova))
+		return -ENOMEM;
+
+	rvu_write64(rvu, BLKADDR_RVUM, RVU_AF_MSIXTR_BASE, (u64)iova);
+	rvu->msix_base_iova = iova;
+
 	return 0;
 }
 
@@ -531,7 +548,8 @@ static void rvu_free_hw_resources(struct rvu *rvu)
 	struct rvu_hwinfo *hw = rvu->hw;
 	struct rvu_block *block;
 	struct rvu_pfvf  *pfvf;
-	int id;
+	int id, max_msix;
+	u64 cfg;
 
 	/* Free block LF bitmaps */
 	for (id = 0; id < BLK_COUNT; id++) {
@@ -549,6 +567,15 @@ static void rvu_free_hw_resources(struct rvu *rvu)
 		pfvf = &rvu->hwvf[id];
 		kfree(pfvf->msix.bmap);
 	}
+
+	/* Unmap MSIX vector base IOVA mapping */
+	if (!rvu->msix_base_iova)
+		return;
+	cfg = rvu_read64(rvu, BLKADDR_RVUM, RVU_PRIV_CONST);
+	max_msix = cfg & 0xFFFFF;
+	dma_unmap_single(rvu->dev, rvu->msix_base_iova,
+			 max_msix * PCI_MSIX_ENTRY_SIZE,
+			 DMA_BIDIRECTIONAL);
 }
 
 static int rvu_setup_hw_resources(struct rvu *rvu)
diff --git a/drivers/soc/marvell/octeontx2/rvu.h b/drivers/soc/marvell/octeontx2/rvu.h
index 7435e83..92c2022 100644
--- a/drivers/soc/marvell/octeontx2/rvu.h
+++ b/drivers/soc/marvell/octeontx2/rvu.h
@@ -99,6 +99,7 @@ struct rvu {
 	u16			num_vec;
 	char			*irq_name;
 	bool			*irq_allocated;
+	dma_addr_t		msix_base_iova;
 };
 
 static inline void rvu_write64(struct rvu *rvu, u64 block, u64 offset, u64 val)
-- 
2.7.4