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

alejandro.lucero-palau
2024-07-15T17:28:52Z

From: Alejandro Lucero <alucerop@amd.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@amd.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