netdev - [PATCH v2 02/15] cxl: add function for type2 cxl regs setup

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Message-ID: <20240715172835.24757-3-alejandro.lucero-palau@amd.com>
Date: Mon, 15 Jul 2024 18:28:22 +0100
From: <alejandro.lucero-palau@....com>
To: <linux-cxl@...r.kernel.org>, <netdev@...r.kernel.org>,
	<dan.j.williams@...el.com>, <martin.habets@...inx.com>,
	<edward.cree@....com>, <davem@...emloft.net>, <kuba@...nel.org>,
	<pabeni@...hat.com>, <edumazet@...gle.com>, <richard.hughes@....com>
CC: Alejandro Lucero <alucerop@....com>
Subject: [PATCH v2 02/15] cxl: add function for type2 cxl regs setup

From: Alejandro Lucero <alucerop@....com>

Create a new function for a type2 device initialising the opaque
cxl_dev_state struct regarding cxl regs setup and mapping.

Signed-off-by: Alejandro Lucero <alucerop@....com>
---
 drivers/cxl/pci.c                  | 28 ++++++++++++++++++++++++++++
 drivers/net/ethernet/sfc/efx_cxl.c |  3 +++
 include/linux/cxl_accel_mem.h      |  1 +
 3 files changed, 32 insertions(+)

diff --git a/drivers/cxl/pci.c b/drivers/cxl/pci.c
index e53646e9f2fb..b34d6259faf4 100644
--- a/drivers/cxl/pci.c
+++ b/drivers/cxl/pci.c
@@ -11,6 +11,7 @@
 #include <linux/pci.h>
 #include <linux/aer.h>
 #include <linux/io.h>
+#include <linux/cxl_accel_mem.h>
 #include "cxlmem.h"
 #include "cxlpci.h"
 #include "cxl.h"
@@ -521,6 +522,33 @@ static int cxl_pci_setup_regs(struct pci_dev *pdev, enum cxl_regloc_type type,
 	return cxl_setup_regs(map);
 }
 
+int cxl_pci_accel_setup_regs(struct pci_dev *pdev, struct cxl_dev_state *cxlds)
+{
+	struct cxl_register_map map;
+	int rc;
+
+	rc = cxl_pci_setup_regs(pdev, CXL_REGLOC_RBI_MEMDEV, &map);
+	if (rc)
+		return rc;
+
+	rc = cxl_map_device_regs(&map, &cxlds->regs.device_regs);
+	if (rc)
+		return rc;
+
+	rc = cxl_pci_setup_regs(pdev, CXL_REGLOC_RBI_COMPONENT,
+				&cxlds->reg_map);
+	if (rc)
+		dev_warn(&pdev->dev, "No component registers (%d)\n", rc);
+
+	rc = cxl_map_component_regs(&cxlds->reg_map, &cxlds->regs.component,
+				    BIT(CXL_CM_CAP_CAP_ID_RAS));
+	if (rc)
+		dev_dbg(&pdev->dev, "Failed to map RAS capability.\n");
+
+	return rc;
+}
+EXPORT_SYMBOL_NS_GPL(cxl_pci_accel_setup_regs, CXL);
+
 static int cxl_pci_ras_unmask(struct pci_dev *pdev)
 {
 	struct cxl_dev_state *cxlds = pci_get_drvdata(pdev);
diff --git a/drivers/net/ethernet/sfc/efx_cxl.c b/drivers/net/ethernet/sfc/efx_cxl.c
index 4554dd7cca76..10c4fb915278 100644
--- a/drivers/net/ethernet/sfc/efx_cxl.c
+++ b/drivers/net/ethernet/sfc/efx_cxl.c
@@ -47,6 +47,9 @@ void efx_cxl_init(struct efx_nic *efx)
 
 	res = DEFINE_RES_MEM_NAMED(0, EFX_CTPIO_BUFFER_SIZE, "ram");
 	cxl_accel_set_resource(cxl->cxlds, res, CXL_ACCEL_RES_RAM);
+
+	if (cxl_pci_accel_setup_regs(pci_dev, cxl->cxlds))
+		pci_info(pci_dev, "CXL accel setup regs failed");
 }
 
 
diff --git a/include/linux/cxl_accel_mem.h b/include/linux/cxl_accel_mem.h
index daf46d41f59c..ca7af4a9cefc 100644
--- a/include/linux/cxl_accel_mem.h
+++ b/include/linux/cxl_accel_mem.h
@@ -19,4 +19,5 @@ void cxl_accel_set_dvsec(cxl_accel_state *cxlds, u16 dvsec);
 void cxl_accel_set_serial(cxl_accel_state *cxlds, u64 serial);
 void cxl_accel_set_resource(struct cxl_dev_state *cxlds, struct resource res,
 			    enum accel_resource);
+int cxl_pci_accel_setup_regs(struct pci_dev *pdev, struct cxl_dev_state *cxlds);
 #endif
-- 
2.17.1