Message-Id: <1612025522-91761-1-git-send-email-gakula@marvell.com>
Date:   Sat, 30 Jan 2021 22:22:02 +0530
From:   Geetha sowjanya <gakula@...vell.com>
To:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     sgoutham@...vell.com, davem@...emloft.net, kuba@...nel.org,
        Geetha sowjanya <gakula@...vell.com>,
        Subbaraya Sundeep <sbhatta@...vell.com>
Subject: [net-next 01/14] octeontx2-af: cn10k: Add mbox support for CN10K platform

Firmware allocates memory regions for PFs and VFs in DRAM.
The PFs memory region is used for AF-PF and PF-VF mailbox.
This mbox facilitates communication between AF-PF and PF-VF.

On CN10K platform:
The DRAM region allocated to PF is enumerated as PF BAR4 memory.
PF BAR4 contains AF-PF mbox region followed by its VFs mbox region.
AF-PF mbox region base address is configured at RVU_AF_PFX_BAR4_ADDR
PF-VF mailbox base address is configured at
RVU_PF(x)_VF_MBOX_ADDR = RVU_AF_PF()_BAR4_ADDR+64KB. PF access its
mbox region via BAR4, whereas VF accesses PF-VF DRAM mailboxes via
BAR2 indirect access.

On CN9XX platform:
Mailbox region in DRAM is divided into two parts AF-PF mbox region and
PF-VF mbox region i.e all PFs mbox region is contiguous similarly all
VFs.
The base address of the AF-PF mbox region is configured at
RVU_AF_PF_BAR4_ADDR.
AF-PF1 mbox address can be calculated as RVU_AF_PF_BAR4_ADDR * mbox
size.
The base address of PF-VF mbox region for each PF is configure at
RVU_AF_PF(0..15)_VF_BAR4_ADDR.PF access its mbox region via BAR4 and its
VF mbox regions from RVU_PF_VF_BAR4_ADDR register, whereas VF access its
mbox region via BAR4.

This patch changes mbox initialization to support both CN9XX and CN10K
platform.

Signed-off-by: Subbaraya Sundeep <sbhatta@...vell.com>
Signed-off-by: Geetha sowjanya <gakula@...vell.com>
Signed-off-by: Sunil Goutham <sgoutham@...vell.com>
---
 drivers/net/ethernet/marvell/octeontx2/af/mbox.c   |  59 ++++++++--
 drivers/net/ethernet/marvell/octeontx2/af/mbox.h   |   4 +
 drivers/net/ethernet/marvell/octeontx2/af/rvu.c    | 122 ++++++++++++++++-----
 drivers/net/ethernet/marvell/octeontx2/af/rvu.h    |  23 ++++
 .../net/ethernet/marvell/octeontx2/af/rvu_reg.h    |   7 ++
 5 files changed, 179 insertions(+), 36 deletions(-)

diff --git a/drivers/net/ethernet/marvell/octeontx2/af/mbox.c b/drivers/net/ethernet/marvell/octeontx2/af/mbox.c
index bbabb8e6..0a37ca9 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/mbox.c
+++ b/drivers/net/ethernet/marvell/octeontx2/af/mbox.c
@@ -20,9 +20,9 @@ static const u16 msgs_offset = ALIGN(sizeof(struct mbox_hdr), MBOX_MSG_ALIGN);
 
 void __otx2_mbox_reset(struct otx2_mbox *mbox, int devid)
 {
-	void *hw_mbase = mbox->hwbase + (devid * MBOX_SIZE);
 	struct otx2_mbox_dev *mdev = &mbox->dev[devid];
 	struct mbox_hdr *tx_hdr, *rx_hdr;
+	void *hw_mbase = mdev->hwbase;
 
 	tx_hdr = hw_mbase + mbox->tx_start;
 	rx_hdr = hw_mbase + mbox->rx_start;
@@ -56,12 +56,9 @@ void otx2_mbox_destroy(struct otx2_mbox *mbox)
 }
 EXPORT_SYMBOL(otx2_mbox_destroy);
 
-int otx2_mbox_init(struct otx2_mbox *mbox, void *hwbase, struct pci_dev *pdev,
-		   void *reg_base, int direction, int ndevs)
+static int otx2_mbox_setup(struct otx2_mbox *mbox, struct pci_dev *pdev,
+			   void *reg_base, int direction, int ndevs)
 {
-	struct otx2_mbox_dev *mdev;
-	int devid;
-
 	switch (direction) {
 	case MBOX_DIR_AFPF:
 	case MBOX_DIR_PFVF:
@@ -121,7 +118,6 @@ int otx2_mbox_init(struct otx2_mbox *mbox, void *hwbase, struct pci_dev *pdev,
 	}
 
 	mbox->reg_base = reg_base;
-	mbox->hwbase = hwbase;
 	mbox->pdev = pdev;
 
 	mbox->dev = kcalloc(ndevs, sizeof(struct otx2_mbox_dev), GFP_KERNEL);
@@ -129,11 +125,27 @@ int otx2_mbox_init(struct otx2_mbox *mbox, void *hwbase, struct pci_dev *pdev,
 		otx2_mbox_destroy(mbox);
 		return -ENOMEM;
 	}
-
 	mbox->ndevs = ndevs;
+
+	return 0;
+}
+
+int otx2_mbox_init(struct otx2_mbox *mbox, void *hwbase, struct pci_dev *pdev,
+		   void *reg_base, int direction, int ndevs)
+{
+	struct otx2_mbox_dev *mdev;
+	int devid, err;
+
+	err = otx2_mbox_setup(mbox, pdev, reg_base, direction, ndevs);
+	if (err)
+		return err;
+
+	mbox->hwbase = hwbase;
+
 	for (devid = 0; devid < ndevs; devid++) {
 		mdev = &mbox->dev[devid];
 		mdev->mbase = mbox->hwbase + (devid * MBOX_SIZE);
+		mdev->hwbase = mdev->mbase;
 		spin_lock_init(&mdev->mbox_lock);
 		/* Init header to reset value */
 		otx2_mbox_reset(mbox, devid);
@@ -143,6 +155,35 @@ int otx2_mbox_init(struct otx2_mbox *mbox, void *hwbase, struct pci_dev *pdev,
 }
 EXPORT_SYMBOL(otx2_mbox_init);
 
+/* Initialize mailbox with the set of mailbox region addresses
+ * in the array hwbase.
+ */
+int otx2_mbox_regions_init(struct otx2_mbox *mbox, void **hwbase,
+			   struct pci_dev *pdev, void *reg_base,
+			   int direction, int ndevs)
+{
+	struct otx2_mbox_dev *mdev;
+	int devid, err;
+
+	err = otx2_mbox_setup(mbox, pdev, reg_base, direction, ndevs);
+	if (err)
+		return err;
+
+	mbox->hwbase = hwbase[0];
+
+	for (devid = 0; devid < ndevs; devid++) {
+		mdev = &mbox->dev[devid];
+		mdev->mbase = hwbase[devid];
+		mdev->hwbase = hwbase[devid];
+		spin_lock_init(&mdev->mbox_lock);
+		/* Init header to reset value */
+		otx2_mbox_reset(mbox, devid);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(otx2_mbox_regions_init);
+
 int otx2_mbox_wait_for_rsp(struct otx2_mbox *mbox, int devid)
 {
 	unsigned long timeout = jiffies + msecs_to_jiffies(MBOX_RSP_TIMEOUT);
@@ -175,9 +216,9 @@ EXPORT_SYMBOL(otx2_mbox_busy_poll_for_rsp);
 
 void otx2_mbox_msg_send(struct otx2_mbox *mbox, int devid)
 {
-	void *hw_mbase = mbox->hwbase + (devid * MBOX_SIZE);
 	struct otx2_mbox_dev *mdev = &mbox->dev[devid];
 	struct mbox_hdr *tx_hdr, *rx_hdr;
+	void *hw_mbase = mdev->hwbase;
 
 	tx_hdr = hw_mbase + mbox->tx_start;
 	rx_hdr = hw_mbase + mbox->rx_start;
diff --git a/drivers/net/ethernet/marvell/octeontx2/af/mbox.h b/drivers/net/ethernet/marvell/octeontx2/af/mbox.h
index 89e93eb..20779a1 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/mbox.h
+++ b/drivers/net/ethernet/marvell/octeontx2/af/mbox.h
@@ -52,6 +52,7 @@
 
 struct otx2_mbox_dev {
 	void	    *mbase;   /* This dev's mbox region */
+	void	    *hwbase;
 	spinlock_t  mbox_lock;
 	u16         msg_size; /* Total msg size to be sent */
 	u16         rsp_size; /* Total rsp size to be sure the reply is ok */
@@ -98,6 +99,9 @@ void otx2_mbox_destroy(struct otx2_mbox *mbox);
 int otx2_mbox_init(struct otx2_mbox *mbox, void __force *hwbase,
 		   struct pci_dev *pdev, void __force *reg_base,
 		   int direction, int ndevs);
+int otx2_mbox_regions_init(struct otx2_mbox *mbox, void __force **hwbase,
+			   struct pci_dev *pdev, void __force *reg_base,
+			   int direction, int ndevs);
 void otx2_mbox_msg_send(struct otx2_mbox *mbox, int devid);
 int otx2_mbox_wait_for_rsp(struct otx2_mbox *mbox, int devid);
 int otx2_mbox_busy_poll_for_rsp(struct otx2_mbox *mbox, int devid);
diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu.c b/drivers/net/ethernet/marvell/octeontx2/af/rvu.c
index 0b6bf9f..587caa1 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/rvu.c
+++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu.c
@@ -78,6 +78,9 @@ static void rvu_setup_hw_capabilities(struct rvu *rvu)
 		if (is_rvu_96xx_A0(rvu))
 			hw->cap.nix_rx_multicast = false;
 	}
+
+	if (!is_rvu_otx2(rvu))
+		hw->cap.per_pf_mbox_regs = true;
 }
 
 /* Poll a RVU block's register 'offset', for a 'zero'
@@ -1936,41 +1939,105 @@ static inline void rvu_afvf_mbox_up_handler(struct work_struct *work)
 	__rvu_mbox_up_handler(mwork, TYPE_AFVF);
 }
 
+static int rvu_get_mbox_regions(struct rvu *rvu, void **mbox_addr,
+				int num, int type)
+{
+	struct rvu_hwinfo *hw = rvu->hw;
+	int region;
+	u64 bar4;
+
+	/* For cn10k platform VF mailbox regions of a PF follows after the
+	 * PF <-> AF mailbox region. Whereas for Octeontx2 it is read from
+	 * RVU_PF_VF_BAR4_ADDR register.
+	 */
+	if (type == TYPE_AFVF) {
+		for (region = 0; region < num; region++) {
+			if (hw->cap.per_pf_mbox_regs) {
+				bar4 = rvu_read64(rvu, BLKADDR_RVUM,
+						  RVU_AF_PFX_BAR4_ADDR(0)) +
+						  MBOX_SIZE;
+				bar4 += region * MBOX_SIZE;
+			} else {
+				bar4 = rvupf_read64(rvu, RVU_PF_VF_BAR4_ADDR);
+				bar4 += region * MBOX_SIZE;
+			}
+			mbox_addr[region] = ioremap_wc(bar4, MBOX_SIZE);
+			if (!mbox_addr[region])
+				goto error;
+		}
+		return 0;
+	}
+
+	/* For cn10k platform AF <-> PF mailbox region of a PF is read from per
+	 * PF registers. Whereas for Octeontx2 it is read from
+	 * RVU_AF_PF_BAR4_ADDR register.
+	 */
+	for (region = 0; region < num; region++) {
+		if (hw->cap.per_pf_mbox_regs) {
+			bar4 = rvu_read64(rvu, BLKADDR_RVUM,
+					  RVU_AF_PFX_BAR4_ADDR(region));
+		} else {
+			bar4 = rvu_read64(rvu, BLKADDR_RVUM,
+					  RVU_AF_PF_BAR4_ADDR);
+			bar4 += region * MBOX_SIZE;
+		}
+		mbox_addr[region] = ioremap_wc(bar4, MBOX_SIZE);
+		if (!mbox_addr[region])
+			goto error;
+	}
+	return 0;
+
+error:
+	while (region--)
+		iounmap(mbox_addr[region]);
+	return -ENOMEM;
+}
+
 static int rvu_mbox_init(struct rvu *rvu, struct mbox_wq_info *mw,
 			 int type, int num,
 			 void (mbox_handler)(struct work_struct *),
 			 void (mbox_up_handler)(struct work_struct *))
 {
-	void __iomem *hwbase = NULL, *reg_base;
-	int err, i, dir, dir_up;
+	int err = -EINVAL, i, dir, dir_up;
+	void __iomem *reg_base;
 	struct rvu_work *mwork;
+	void **mbox_regions;
 	const char *name;
-	u64 bar4_addr;
+
+	mbox_regions = kcalloc(num, sizeof(void *), GFP_KERNEL);
+	if (!mbox_regions)
+		return -ENOMEM;
 
 	switch (type) {
 	case TYPE_AFPF:
 		name = "rvu_afpf_mailbox";
-		bar4_addr = rvu_read64(rvu, BLKADDR_RVUM, RVU_AF_PF_BAR4_ADDR);
 		dir = MBOX_DIR_AFPF;
 		dir_up = MBOX_DIR_AFPF_UP;
 		reg_base = rvu->afreg_base;
+		err = rvu_get_mbox_regions(rvu, mbox_regions, num, TYPE_AFPF);
+		if (err)
+			goto free_regions;
 		break;
 	case TYPE_AFVF:
 		name = "rvu_afvf_mailbox";
-		bar4_addr = rvupf_read64(rvu, RVU_PF_VF_BAR4_ADDR);
 		dir = MBOX_DIR_PFVF;
 		dir_up = MBOX_DIR_PFVF_UP;
 		reg_base = rvu->pfreg_base;
+		err = rvu_get_mbox_regions(rvu, mbox_regions, num, TYPE_AFVF);
+		if (err)
+			goto free_regions;
 		break;
 	default:
-		return -EINVAL;
+		return err;
 	}
 
 	mw->mbox_wq = alloc_workqueue(name,
 				      WQ_UNBOUND | WQ_HIGHPRI | WQ_MEM_RECLAIM,
 				      num);
-	if (!mw->mbox_wq)
-		return -ENOMEM;
+	if (!mw->mbox_wq) {
+		err = -ENOMEM;
+		goto unmap_regions;
+	}
 
 	mw->mbox_wrk = devm_kcalloc(rvu->dev, num,
 				    sizeof(struct rvu_work), GFP_KERNEL);
@@ -1986,23 +2053,13 @@ static int rvu_mbox_init(struct rvu *rvu, struct mbox_wq_info *mw,
 		goto exit;
 	}
 
-	/* Mailbox is a reserved memory (in RAM) region shared between
-	 * RVU devices, shouldn't be mapped as device memory to allow
-	 * unaligned accesses.
-	 */
-	hwbase = ioremap_wc(bar4_addr, MBOX_SIZE * num);
-	if (!hwbase) {
-		dev_err(rvu->dev, "Unable to map mailbox region\n");
-		err = -ENOMEM;
-		goto exit;
-	}
-
-	err = otx2_mbox_init(&mw->mbox, hwbase, rvu->pdev, reg_base, dir, num);
+	err = otx2_mbox_regions_init(&mw->mbox, mbox_regions, rvu->pdev,
+				     reg_base, dir, num);
 	if (err)
 		goto exit;
 
-	err = otx2_mbox_init(&mw->mbox_up, hwbase, rvu->pdev,
-			     reg_base, dir_up, num);
+	err = otx2_mbox_regions_init(&mw->mbox_up, mbox_regions, rvu->pdev,
+				     reg_base, dir_up, num);
 	if (err)
 		goto exit;
 
@@ -2015,25 +2072,36 @@ static int rvu_mbox_init(struct rvu *rvu, struct mbox_wq_info *mw,
 		mwork->rvu = rvu;
 		INIT_WORK(&mwork->work, mbox_up_handler);
 	}
-
+	kfree(mbox_regions);
 	return 0;
+
 exit:
-	if (hwbase)
-		iounmap((void __iomem *)hwbase);
 	destroy_workqueue(mw->mbox_wq);
+unmap_regions:
+	while (num--)
+		iounmap(mbox_regions[num]);
+free_regions:
+	kfree(mbox_regions);
 	return err;
 }
 
 static void rvu_mbox_destroy(struct mbox_wq_info *mw)
 {
+	struct otx2_mbox *mbox = &mw->mbox;
+	struct otx2_mbox_dev *mdev;
+	int devid;
+
 	if (mw->mbox_wq) {
 		flush_workqueue(mw->mbox_wq);
 		destroy_workqueue(mw->mbox_wq);
 		mw->mbox_wq = NULL;
 	}
 
-	if (mw->mbox.hwbase)
-		iounmap((void __iomem *)mw->mbox.hwbase);
+	for (devid = 0; devid < mbox->ndevs; devid++) {
+		mdev = &mbox->dev[devid];
+		if (mdev->hwbase)
+			iounmap((void __iomem *)mdev->hwbase);
+	}
 
 	otx2_mbox_destroy(&mw->mbox);
 	otx2_mbox_destroy(&mw->mbox_up);
diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu.h b/drivers/net/ethernet/marvell/octeontx2/af/rvu.h
index b1a6ecf..e553d8f 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/rvu.h
+++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu.h
@@ -25,6 +25,7 @@
 
 /* Subsystem Device ID */
 #define PCI_SUBSYS_DEVID_96XX                  0xB200
+#define PCI_SUBSYS_DEVID_CN10K_A	       0xB900
 
 /* PCI BAR nos */
 #define	PCI_AF_REG_BAR_NUM			0
@@ -296,6 +297,7 @@ struct hw_cap {
 	bool	nix_shaping;		 /* Is shaping and coloring supported */
 	bool	nix_tx_link_bp;		 /* Can link backpressure TL queues ? */
 	bool	nix_rx_multicast;	 /* Rx packet replication support */
+	bool	per_pf_mbox_regs; /* PF mbox specified in per PF registers ? */
 };
 
 struct rvu_hwinfo {
@@ -465,6 +467,27 @@ static inline bool is_rvu_96xx_B0(struct rvu *rvu)
 		(pdev->subsystem_device == PCI_SUBSYS_DEVID_96XX);
 }
 
+/* REVID for PCIe devices.
+ * Bits 0..1: minor pass, bit 3..2: major pass
+ * bits 7..4: midr id
+ */
+#define PCI_REVISION_ID_96XX		0x00
+#define PCI_REVISION_ID_95XX		0x10
+#define PCI_REVISION_ID_LOKI		0x20
+#define PCI_REVISION_ID_98XX		0x30
+#define PCI_REVISION_ID_95XXMM		0x40
+
+static inline bool is_rvu_otx2(struct rvu *rvu)
+{
+	struct pci_dev *pdev = rvu->pdev;
+
+	u8 midr = pdev->revision & 0xF0;
+
+	return (midr == PCI_REVISION_ID_96XX || midr == PCI_REVISION_ID_95XX ||
+		midr == PCI_REVISION_ID_LOKI || midr == PCI_REVISION_ID_98XX ||
+		midr == PCI_REVISION_ID_95XXMM);
+}
+
 /* Function Prototypes
  * RVU
  */
diff --git a/drivers/net/ethernet/marvell/octeontx2/af/rvu_reg.h b/drivers/net/ethernet/marvell/octeontx2/af/rvu_reg.h
index 0fb2aa9..a07d12a 100644
--- a/drivers/net/ethernet/marvell/octeontx2/af/rvu_reg.h
+++ b/drivers/net/ethernet/marvell/octeontx2/af/rvu_reg.h
@@ -44,6 +44,11 @@
 #define RVU_AF_PFME_INT_W1S                 (0x28c8)
 #define RVU_AF_PFME_INT_ENA_W1S             (0x28d0)
 #define RVU_AF_PFME_INT_ENA_W1C             (0x28d8)
+#define RVU_AF_PFX_BAR4_ADDR(a)             (0x5000 | (a) << 4)
+#define RVU_AF_PFX_BAR4_CFG                 (0x5200 | (a) << 4)
+#define RVU_AF_PFX_VF_BAR4_ADDR             (0x5400 | (a) << 4)
+#define RVU_AF_PFX_VF_BAR4_CFG              (0x5600 | (a) << 4)
+#define RVU_AF_PFX_LMTLINE_ADDR             (0x5800 | (a) << 4)
 
 /* Admin function's privileged PF/VF registers */
 #define RVU_PRIV_CONST                      (0x8000000)
@@ -100,6 +105,8 @@
 #define RVU_PF_MSIX_VECX_ADDR(a)            (0x000 | (a) << 4)
 #define RVU_PF_MSIX_VECX_CTL(a)             (0x008 | (a) << 4)
 #define RVU_PF_MSIX_PBAX(a)                 (0xF0000 | (a) << 3)
+#define RVU_PF_VF_MBOX_ADDR                 (0xC40)
+#define RVU_PF_LMTLINE_ADDR                 (0xC48)
 
 /* RVU VF registers */
 #define	RVU_VF_VFPF_MBOX0		    (0x00000)
-- 
2.7.4

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