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

Dan Williams
2023-06-08T19:30:21Z

Terry Bowman wrote:
> 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.

Looks good to me some small formatting requests below:

>
> 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;

Use a designated initializer here like other locations:

diff --git a/drivers/cxl/core/regs.c b/drivers/cxl/core/regs.c
index 9230b419988e..bd955fae65cd 100644
--- a/drivers/cxl/core/regs.c
+++ b/drivers/cxl/core/regs.c
@@ -304,9 +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;
+ *map = (struct cxl_register_map) {
+ .dev = &pdev->dev,
+ .resource = CXL_RESOURCE_NONE,
+ };

regloc = pci_find_dvsec_capability(pdev, PCI_DVSEC_VENDOR_ID_CXL,
CXL_DVSEC_REG_LOCATOR);

> +

Remove this unrelated whitespace change.

> 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;
> +

...and this one too, before Jonathan notices.

> 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);
> +

Ditto.

> 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
>