linux-kernel - [Patch v2 02/12] net: mana: Record the physical address for doorbell page region

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Message-Id: <1653382572-14788-3-git-send-email-longli@linuxonhyperv.com>
Date:   Tue, 24 May 2022 01:56:02 -0700
From:   longli@...uxonhyperv.com
To:     "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Leon Romanovsky <leon@...nel.org>,
        Ajay Sharma <sharmaajay@...rosoft.com>
Cc:     linux-hyperv@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-rdma@...r.kernel.org,
        Long Li <longli@...rosoft.com>
Subject: [Patch v2 02/12] net: mana: Record the physical address for doorbell page region

From: Long Li <longli@...rosoft.com>

For supporting RDMA device with multiple user contexts with their
individual doorbell pages, record the start address of doorbell page
region for use by the RDMA driver to allocate user context doorbell IDs.

Signed-off-by: Long Li <longli@...rosoft.com>
---
 drivers/net/ethernet/microsoft/mana/gdma.h      | 2 ++
 drivers/net/ethernet/microsoft/mana/gdma_main.c | 4 ++++
 2 files changed, 6 insertions(+)

diff --git a/drivers/net/ethernet/microsoft/mana/gdma.h b/drivers/net/ethernet/microsoft/mana/gdma.h
index d815d323be87..c724ca410fcb 100644
--- a/drivers/net/ethernet/microsoft/mana/gdma.h
+++ b/drivers/net/ethernet/microsoft/mana/gdma.h
@@ -350,9 +350,11 @@ struct gdma_context {
 	struct completion	eq_test_event;
 	u32			test_event_eq_id;
 
+	phys_addr_t		bar0_pa;
 	void __iomem		*bar0_va;
 	void __iomem		*shm_base;
 	void __iomem		*db_page_base;
+	phys_addr_t		phys_db_page_base;
 	u32 db_page_size;
 
 	/* Shared memory chanenl (used to bootstrap HWC) */
diff --git a/drivers/net/ethernet/microsoft/mana/gdma_main.c b/drivers/net/ethernet/microsoft/mana/gdma_main.c
index 49b85ca578b0..9fafaa0c8e76 100644
--- a/drivers/net/ethernet/microsoft/mana/gdma_main.c
+++ b/drivers/net/ethernet/microsoft/mana/gdma_main.c
@@ -27,6 +27,9 @@ static void mana_gd_init_registers(struct pci_dev *pdev)
 	gc->db_page_base = gc->bar0_va +
 				mana_gd_r64(gc, GDMA_REG_DB_PAGE_OFFSET);
 
+	gc->phys_db_page_base = gc->bar0_pa +
+				mana_gd_r64(gc, GDMA_REG_DB_PAGE_OFFSET);
+
 	gc->shm_base = gc->bar0_va + mana_gd_r64(gc, GDMA_REG_SHM_OFFSET);
 }
 
@@ -1335,6 +1338,7 @@ static int mana_gd_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 
 	mutex_init(&gc->eq_test_event_mutex);
 	pci_set_drvdata(pdev, gc);
+	gc->bar0_pa = pci_resource_start(pdev, 0);
 
 	bar0_va = pci_iomap(pdev, bar, 0);
 	if (!bar0_va)
-- 
2.17.1