[PATCH v5 05/26] cxl/core/regs: Add @dev to cxl_register_map

Terry Bowman
2023-06-07T22:18:18Z

From: Robert Richter <rrichter@amd.com>

The corresponding device of a register mapping is used for devm
operations and logging. For operations with struct cxl_register_map
the device needs to be kept track separately. To simpify the involved
function interfaces, add @dev to cxl_register_map.

While at it also reorder function arguments of cxl_map_device_regs()
and cxl_map_component_regs() to have the object @cxl_register_map
first.

In a result a bunch of functions are available to be used with a
@cxl_register_map object.

This patch is in preparation of reworking the component register setup
code.

Signed-off-by: Robert Richter <rrichter@amd.com>
Signed-off-by: Terry Bowman <terry.bowman@amd.com>
---
drivers/cxl/core/hdm.c | 4 ++--
drivers/cxl/core/regs.c | 16 +++++++++++-----
drivers/cxl/cxl.h | 10 ++++++----
drivers/cxl/pci.c | 24 ++++++++++++------------
4 files changed, 31 insertions(+), 23 deletions(-)

diff --git a/drivers/cxl/core/hdm.c b/drivers/cxl/core/hdm.c
index 7889ff203a34..5abfa9276dac 100644
--- a/drivers/cxl/core/hdm.c
+++ b/drivers/cxl/core/hdm.c
@@ -85,6 +85,7 @@ static int map_hdm_decoder_regs(struct cxl_port *port, void __iomem *crb,
struct cxl_component_regs *regs)
{
struct cxl_register_map map = {
+ .dev = &port->dev,
.resource = port->component_reg_phys,
.base = crb,
.max_size = CXL_COMPONENT_REG_BLOCK_SIZE,
@@ -97,8 +98,7 @@ static int map_hdm_decoder_regs(struct cxl_port *port, void __iomem *crb,
return -ENODEV;
}

- return cxl_map_component_regs(&port->dev, regs, &map,
- BIT(CXL_CM_CAP_CAP_ID_HDM));
+ return cxl_map_component_regs(&map, regs, BIT(CXL_CM_CAP_CAP_ID_HDM));
}

static bool should_emulate_decoders(struct cxl_endpoint_dvsec_info *info)
diff --git a/drivers/cxl/core/regs.c b/drivers/cxl/core/regs.c
index c2e6ec6e716d..3b4e56fb36a8 100644
--- a/drivers/cxl/core/regs.c
+++ b/drivers/cxl/core/regs.c
@@ -199,9 +199,11 @@ void __iomem *devm_cxl_iomap_block(struct device *dev, resource_size_t addr,
return ret_val;
}

-int cxl_map_component_regs(struct device *dev, struct cxl_component_regs *regs,
- struct cxl_register_map *map, unsigned long map_mask)
+int cxl_map_component_regs(struct cxl_register_map *map,
+ struct cxl_component_regs *regs,
+ unsigned long map_mask)
{
+ struct device *dev = map->dev;
struct mapinfo {
struct cxl_reg_map *rmap;
void __iomem **addr;
@@ -231,10 +233,10 @@ int cxl_map_component_regs(struct device *dev, struct cxl_component_regs *regs,
}
EXPORT_SYMBOL_NS_GPL(cxl_map_component_regs, CXL);

-int cxl_map_device_regs(struct device *dev,
- struct cxl_device_regs *regs,
- struct cxl_register_map *map)
+int cxl_map_device_regs(struct cxl_register_map *map,
+ struct cxl_device_regs *regs)
{
+ struct device *dev = map->dev;
resource_size_t phys_addr = map->resource;
struct mapinfo {
struct cxl_reg_map *rmap;
@@ -302,7 +304,10 @@ int cxl_find_regblock(struct pci_dev *pdev, enum cxl_regloc_type type,
u32 regloc_size, regblocks;
int regloc, i;

+ memset(map, 0, sizeof(*map));
+ map->dev = &pdev->dev;
map->resource = CXL_RESOURCE_NONE;
+
regloc = pci_find_dvsec_capability(pdev, PCI_DVSEC_VENDOR_ID_CXL,
CXL_DVSEC_REG_LOCATOR);
if (!regloc)
@@ -328,6 +333,7 @@ int cxl_find_regblock(struct pci_dev *pdev, enum cxl_regloc_type type,
}

map->resource = CXL_RESOURCE_NONE;
+
return -ENODEV;
}
EXPORT_SYMBOL_NS_GPL(cxl_find_regblock, CXL);
diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h
index a8bda2c74a85..095b767c21e9 100644
--- a/drivers/cxl/cxl.h
+++ b/drivers/cxl/cxl.h
@@ -231,6 +231,7 @@ struct cxl_device_reg_map {

/**
* struct cxl_register_map - DVSEC harvested register block mapping parameters
+ * @dev: device for devm operations and logging
* @base: virtual base of the register-block-BAR + @block_offset
* @resource: physical resource base of the register block
* @max_size: maximum mapping size to perform register search
@@ -239,6 +240,7 @@ struct cxl_device_reg_map {
* @device_map: cxl_reg_maps for device registers
*/
struct cxl_register_map {
+ struct device *dev;
void __iomem *base;
resource_size_t resource;
resource_size_t max_size;
@@ -253,11 +255,11 @@ void cxl_probe_component_regs(struct device *dev, void __iomem *base,
struct cxl_component_reg_map *map);
void cxl_probe_device_regs(struct device *dev, void __iomem *base,
struct cxl_device_reg_map *map);
-int cxl_map_component_regs(struct device *dev, struct cxl_component_regs *regs,
- struct cxl_register_map *map,
+int cxl_map_component_regs(struct cxl_register_map *map,
+ struct cxl_component_regs *regs,
unsigned long map_mask);
-int cxl_map_device_regs(struct device *dev, struct cxl_device_regs *regs,
- struct cxl_register_map *map);
+int cxl_map_device_regs(struct cxl_register_map *map,
+ struct cxl_device_regs *regs);

enum cxl_regloc_type;
int cxl_find_regblock(struct pci_dev *pdev, enum cxl_regloc_type type,
diff --git a/drivers/cxl/pci.c b/drivers/cxl/pci.c
index 0872f2233ed0..9c1b44f42e49 100644
--- a/drivers/cxl/pci.c
+++ b/drivers/cxl/pci.c
@@ -274,9 +274,9 @@ static int cxl_pci_setup_mailbox(struct cxl_dev_state *cxlds)
return 0;
}

-static int cxl_map_regblock(struct pci_dev *pdev, struct cxl_register_map *map)
+static int cxl_map_regblock(struct cxl_register_map *map)
{
- struct device *dev = &pdev->dev;
+ struct device *dev = map->dev;

map->base = ioremap(map->resource, map->max_size);
if (!map->base) {
@@ -285,21 +285,21 @@ static int cxl_map_regblock(struct pci_dev *pdev, struct cxl_register_map *map)
}

dev_dbg(dev, "Mapped CXL Memory Device resource %pa\n", &map->resource);
+
return 0;
}

-static void cxl_unmap_regblock(struct pci_dev *pdev,
- struct cxl_register_map *map)
+static void cxl_unmap_regblock(struct cxl_register_map *map)
{
iounmap(map->base);
map->base = NULL;
}

-static int cxl_probe_regs(struct pci_dev *pdev, struct cxl_register_map *map)
+static int cxl_probe_regs(struct cxl_register_map *map)
{
struct cxl_component_reg_map *comp_map;
struct cxl_device_reg_map *dev_map;
- struct device *dev = &pdev->dev;
+ struct device *dev = map->dev;
void __iomem *base = map->base;

switch (map->reg_type) {
@@ -346,12 +346,12 @@ static int cxl_setup_regs(struct pci_dev *pdev, enum cxl_regloc_type type,
if (rc)
return rc;

- rc = cxl_map_regblock(pdev, map);
+ rc = cxl_map_regblock(map);
if (rc)
return rc;

- rc = cxl_probe_regs(pdev, map);
- cxl_unmap_regblock(pdev, map);
+ rc = cxl_probe_regs(map);
+ cxl_unmap_regblock(map);

return rc;
}
@@ -688,7 +688,7 @@ static int cxl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
if (rc)
return rc;

- rc = cxl_map_device_regs(&pdev->dev, &cxlds->regs.device_regs, &map);
+ rc = cxl_map_device_regs(&map, &cxlds->regs.device_regs);
if (rc)
return rc;

@@ -703,8 +703,8 @@ static int cxl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)

cxlds->component_reg_phys = map.resource;

- rc = cxl_map_component_regs(&pdev->dev, &cxlds->regs.component,
- &map, BIT(CXL_CM_CAP_CAP_ID_RAS));
+ rc = cxl_map_component_regs(&map, &cxlds->regs.component,
+ BIT(CXL_CM_CAP_CAP_ID_RAS));
if (rc)
dev_dbg(&pdev->dev, "Failed to map RAS capability.\n");

--
2.34.1