[PATCH v11 02/20] cxl/core/regs: Rename @dev to @host in struct cxl_register_map

Robert Richter
2023-09-27T15:46:22Z

The primary role of @dev is to host the mappings for devm operations.
@dev is too ambiguous as a name. I.e. when does @dev refer to the
'struct device *' instance that the registers belong, and when does
@dev refer to the 'struct device *' instance hosting the mapping for
devm operations?

Clarify the role of @dev in cxl_register_map by renaming it to @host.
Also, rename local variables to 'host' where map->host is used.

Add Fixes: tag as the fix in the next patch depends on this change.

Fixes: 5d2ffbe4b81a ("cxl/port: Store the downstream port's Component Register mappings in struct cxl_dport")
Signed-off-by: Terry Bowman <terry.bowman@amd.com>
Signed-off-by: Robert Richter <rrichter@amd.com>
---
drivers/cxl/core/hdm.c | 2 +-
drivers/cxl/core/port.c | 4 ++--
drivers/cxl/core/regs.c | 28 ++++++++++++++--------------
drivers/cxl/cxl.h | 4 ++--
drivers/cxl/pci.c | 2 +-
5 files changed, 20 insertions(+), 20 deletions(-)

diff --git a/drivers/cxl/core/hdm.c b/drivers/cxl/core/hdm.c
index 4449b34a80cc..11d9971f3e8c 100644
--- a/drivers/cxl/core/hdm.c
+++ b/drivers/cxl/core/hdm.c
@@ -85,7 +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,
+ .host = &port->dev,
.resource = port->component_reg_phys,
.base = crb,
.max_size = CXL_COMPONENT_REG_BLOCK_SIZE,
diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c
index d4572a02989a..033651a5da30 100644
--- a/drivers/cxl/core/port.c
+++ b/drivers/cxl/core/port.c
@@ -691,14 +691,14 @@ static struct cxl_port *cxl_port_alloc(struct device *uport_dev,
return ERR_PTR(rc);
}

-static int cxl_setup_comp_regs(struct device *dev, struct cxl_register_map *map,
+static int cxl_setup_comp_regs(struct device *host, struct cxl_register_map *map,
resource_size_t component_reg_phys)
{
if (component_reg_phys == CXL_RESOURCE_NONE)
return 0;

*map = (struct cxl_register_map) {
- .dev = dev,
+ .host = host,
.reg_type = CXL_REGLOC_RBI_COMPONENT,
.resource = component_reg_phys,
.max_size = CXL_COMPONENT_REG_BLOCK_SIZE,
diff --git a/drivers/cxl/core/regs.c b/drivers/cxl/core/regs.c
index 6281127b3e9d..e0fbe964f6f0 100644
--- a/drivers/cxl/core/regs.c
+++ b/drivers/cxl/core/regs.c
@@ -204,7 +204,7 @@ int cxl_map_component_regs(const struct cxl_register_map *map,
struct cxl_component_regs *regs,
unsigned long map_mask)
{
- struct device *dev = map->dev;
+ struct device *host = map->host;
struct mapinfo {
const struct cxl_reg_map *rmap;
void __iomem **addr;
@@ -225,7 +225,7 @@ int cxl_map_component_regs(const struct cxl_register_map *map,
continue;
phys_addr = map->resource + mi->rmap->offset;
length = mi->rmap->size;
- *(mi->addr) = devm_cxl_iomap_block(dev, phys_addr, length);
+ *(mi->addr) = devm_cxl_iomap_block(host, phys_addr, length);
if (!*(mi->addr))
return -ENOMEM;
}
@@ -237,7 +237,7 @@ EXPORT_SYMBOL_NS_GPL(cxl_map_component_regs, CXL);
int cxl_map_device_regs(const struct cxl_register_map *map,
struct cxl_device_regs *regs)
{
- struct device *dev = map->dev;
+ struct device *host = map->host;
resource_size_t phys_addr = map->resource;
struct mapinfo {
const struct cxl_reg_map *rmap;
@@ -259,7 +259,7 @@ int cxl_map_device_regs(const struct cxl_register_map *map,

addr = phys_addr + mi->rmap->offset;
length = mi->rmap->size;
- *(mi->addr) = devm_cxl_iomap_block(dev, addr, length);
+ *(mi->addr) = devm_cxl_iomap_block(host, addr, length);
if (!*(mi->addr))
return -ENOMEM;
}
@@ -309,7 +309,7 @@ int cxl_find_regblock_instance(struct pci_dev *pdev, enum cxl_regloc_type type,
int regloc, i;

*map = (struct cxl_register_map) {
- .dev = &pdev->dev,
+ .host = &pdev->dev,
.resource = CXL_RESOURCE_NONE,
};

@@ -403,15 +403,15 @@ EXPORT_SYMBOL_NS_GPL(cxl_map_pmu_regs, CXL);

static int cxl_map_regblock(struct cxl_register_map *map)
{
- struct device *dev = map->dev;
+ struct device *host = map->host;

map->base = ioremap(map->resource, map->max_size);
if (!map->base) {
- dev_err(dev, "failed to map registers\n");
+ dev_err(host, "failed to map registers\n");
return -ENOMEM;
}

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

@@ -425,28 +425,28 @@ 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 = map->dev;
+ struct device *host = map->host;
void __iomem *base = map->base;

switch (map->reg_type) {
case CXL_REGLOC_RBI_COMPONENT:
comp_map = &map->component_map;
- cxl_probe_component_regs(dev, base, comp_map);
- dev_dbg(dev, "Set up component registers\n");
+ cxl_probe_component_regs(host, base, comp_map);
+ dev_dbg(host, "Set up component registers\n");
break;
case CXL_REGLOC_RBI_MEMDEV:
dev_map = &map->device_map;
- cxl_probe_device_regs(dev, base, dev_map);
+ cxl_probe_device_regs(host, base, dev_map);
if (!dev_map->status.valid || !dev_map->mbox.valid ||
!dev_map->memdev.valid) {
- dev_err(dev, "registers not found: %s%s%s\n",
+ dev_err(host, "registers not found: %s%s%s\n",
!dev_map->status.valid ? "status " : "",
!dev_map->mbox.valid ? "mbox " : "",
!dev_map->memdev.valid ? "memdev " : "");
return -ENXIO;
}

- dev_dbg(dev, "Probing device registers...\n");
+ dev_dbg(host, "Probing device registers...\n");
break;
default:
break;
diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h
index 76d92561af29..b5b015b661ea 100644
--- a/drivers/cxl/cxl.h
+++ b/drivers/cxl/cxl.h
@@ -247,7 +247,7 @@ struct cxl_pmu_reg_map {

/**
* struct cxl_register_map - DVSEC harvested register block mapping parameters
- * @dev: device for devm operations and logging
+ * @host: 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
@@ -257,7 +257,7 @@ struct cxl_pmu_reg_map {
* @pmu_map: cxl_reg_maps for CXL Performance Monitoring Units
*/
struct cxl_register_map {
- struct device *dev;
+ struct device *host;
void __iomem *base;
resource_size_t resource;
resource_size_t max_size;
diff --git a/drivers/cxl/pci.c b/drivers/cxl/pci.c
index 44a21ab7add5..f9d852957809 100644
--- a/drivers/cxl/pci.c
+++ b/drivers/cxl/pci.c
@@ -484,7 +484,7 @@ static int cxl_rcrb_get_comp_regs(struct pci_dev *pdev,
resource_size_t component_reg_phys;

*map = (struct cxl_register_map) {
- .dev = &pdev->dev,
+ .host = &pdev->dev,
.resource = CXL_RESOURCE_NONE,
};

--
2.30.2