netdev - [PATCH v2 03/15] cxl: add function for type2 resource request

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Message-ID: <20240715172835.24757-4-alejandro.lucero-palau@amd.com>
Date: Mon, 15 Jul 2024 18:28:23 +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 03/15] cxl: add function for type2 resource request

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

Create a new function for a type2 device requesting a resource
passing the opaque struct to work with.

Signed-off-by: Alejandro Lucero <alucerop@....com>
---
 drivers/cxl/core/memdev.c          | 13 +++++++++++++
 drivers/net/ethernet/sfc/efx_cxl.c |  7 ++++++-
 include/linux/cxl_accel_mem.h      |  1 +
 3 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/drivers/cxl/core/memdev.c b/drivers/cxl/core/memdev.c
index 61b5d35b49e7..04c3a0f8bc2e 100644
--- a/drivers/cxl/core/memdev.c
+++ b/drivers/cxl/core/memdev.c
@@ -744,6 +744,19 @@ void cxl_accel_set_resource(struct cxl_dev_state *cxlds, struct resource res,
 }
 EXPORT_SYMBOL_NS_GPL(cxl_accel_set_resource, CXL);
 
+int cxl_accel_request_resource(struct cxl_dev_state *cxlds, bool is_ram)
+{
+	int rc;
+
+	if (is_ram)
+		rc = request_resource(&cxlds->dpa_res, &cxlds->ram_res);
+	else
+		rc = request_resource(&cxlds->dpa_res, &cxlds->pmem_res);
+
+	return rc;
+}
+EXPORT_SYMBOL_NS_GPL(cxl_accel_request_resource, CXL);
+
 static int cxl_memdev_release_file(struct inode *inode, struct file *file)
 {
 	struct cxl_memdev *cxlmd =
diff --git a/drivers/net/ethernet/sfc/efx_cxl.c b/drivers/net/ethernet/sfc/efx_cxl.c
index 10c4fb915278..9cefcaf3caca 100644
--- a/drivers/net/ethernet/sfc/efx_cxl.c
+++ b/drivers/net/ethernet/sfc/efx_cxl.c
@@ -48,8 +48,13 @@ 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))
+	if (cxl_pci_accel_setup_regs(pci_dev, cxl->cxlds)) {
 		pci_info(pci_dev, "CXL accel setup regs failed");
+		return;
+	}
+
+	if (cxl_accel_request_resource(cxl->cxlds, true))
+		pci_info(pci_dev, "CXL accel resource request failed");
 }
 
 
diff --git a/include/linux/cxl_accel_mem.h b/include/linux/cxl_accel_mem.h
index ca7af4a9cefc..c7b254edc096 100644
--- a/include/linux/cxl_accel_mem.h
+++ b/include/linux/cxl_accel_mem.h
@@ -20,4 +20,5 @@ 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);
+int cxl_accel_request_resource(struct cxl_dev_state *cxlds, bool is_ram);
 #endif
-- 
2.17.1