mirrors/linux
2
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-05-08 14:02:37 -04:00
Code Issues Packages Projects Releases Wiki Activity

cxl/pci: Refactor component register discovery for reuse

Browse Source 
The endpoint implements component register setup code. Refactor it for
reuse with RCRB, downstream port, and upstream port setup.

Move PCI specifics from cxl_setup_regs() into cxl_pci_setup_regs().

Move cxl_setup_regs() into cxl/core/regs.c and export it. This also
includes supporting static functions cxl_map_registerblock(),
cxl_unmap_register_block() and cxl_probe_regs().

Co-developed-by: Robert Richter <rrichter@amd.com>
Signed-off-by: Robert Richter <rrichter@amd.com>
Signed-off-by: Terry Bowman <terry.bowman@amd.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/20230622205523.85375-8-terry.bowman@amd.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Terry Bowman
2023-06-22 15:55:03 -05:00
committed by Dan Williams
parent 573408049b
commit d076bb8c4c
3 changed files with 83 additions and 74 deletions
Download Patch File Download Diff File Expand all files Collapse all files

77
drivers/cxl/core/regs.c
View File

@@ -338,6 +338,83 @@ int cxl_find_regblock(struct pci_dev *pdev, enum cxl_regloc_type type,
}
EXPORT_SYMBOL_NS_GPL(cxl_find_regblock, CXL);
static int cxl_map_regblock(struct cxl_register_map *map)
{
struct device *dev = map->dev;
map->base = ioremap(map->resource, map->max_size);
if (!map->base) {
dev_err(dev, "failed to map registers\n");
return -ENOMEM;
}
dev_dbg(dev, "Mapped CXL Memory Device resource %pa\n", &map->resource);
return 0;
}
static void cxl_unmap_regblock(struct cxl_register_map *map)
{
iounmap(map->base);
map->base = NULL;
}
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;
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);
if (!comp_map->hdm_decoder.valid) {
dev_err(dev, "HDM decoder registers not found\n");
return -ENXIO;
}
if (!comp_map->ras.valid)
dev_dbg(dev, "RAS registers not found\n");
dev_dbg(dev, "Set up component registers\n");
break;
case CXL_REGLOC_RBI_MEMDEV:
dev_map = &map->device_map;
cxl_probe_device_regs(dev, 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_map->status.valid ? "status " : "",
!dev_map->mbox.valid ? "mbox " : "",
!dev_map->memdev.valid ? "memdev " : "");
return -ENXIO;
}
dev_dbg(dev, "Probing device registers...\n");
break;
default:
break;
}
return 0;
}
int cxl_setup_regs(struct cxl_register_map *map)
{
int rc;
rc = cxl_map_regblock(map);
if (rc)
return rc;
rc = cxl_probe_regs(map);
cxl_unmap_regblock(map);
return rc;
}
EXPORT_SYMBOL_NS_GPL(cxl_setup_regs, CXL);
resource_size_t __rcrb_to_component(struct device *dev, struct cxl_rcrb_info *ri,
enum cxl_rcrb which)
{

1
drivers/cxl/cxl.h
View File

@@ -264,6 +264,7 @@ int cxl_map_device_regs(struct cxl_register_map *map,
enum cxl_regloc_type;
int cxl_find_regblock(struct pci_dev *pdev, enum cxl_regloc_type type,
struct cxl_register_map *map);
int cxl_setup_regs(struct cxl_register_map *map);
struct cxl_dport;
resource_size_t cxl_rcd_component_reg_phys(struct device *dev,
struct cxl_dport *dport);

79
drivers/cxl/pci.c
View File

@@ -274,70 +274,8 @@ static int cxl_pci_setup_mailbox(struct cxl_dev_state *cxlds)
return 0;
}
static int cxl_map_regblock(struct cxl_register_map *map)
{
struct device *dev = map->dev;
map->base = ioremap(map->resource, map->max_size);
if (!map->base) {
dev_err(dev, "failed to map registers\n");
return -ENOMEM;
}
dev_dbg(dev, "Mapped CXL Memory Device resource %pa\n", &map->resource);
return 0;
}
static void cxl_unmap_regblock(struct cxl_register_map *map)
{
iounmap(map->base);
map->base = NULL;
}
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;
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);
if (!comp_map->hdm_decoder.valid) {
dev_err(dev, "HDM decoder registers not found\n");
return -ENXIO;
}
if (!comp_map->ras.valid)
dev_dbg(dev, "RAS registers not found\n");
dev_dbg(dev, "Set up component registers\n");
break;
case CXL_REGLOC_RBI_MEMDEV:
dev_map = &map->device_map;
cxl_probe_device_regs(dev, 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_map->status.valid ? "status " : "",
!dev_map->mbox.valid ? "mbox " : "",
!dev_map->memdev.valid ? "memdev " : "");
return -ENXIO;
}
dev_dbg(dev, "Probing device registers...\n");
break;
default:
break;
}
return 0;
}
static int cxl_setup_regs(struct pci_dev *pdev, enum cxl_regloc_type type,
struct cxl_register_map *map)
static int cxl_pci_setup_regs(struct pci_dev *pdev, enum cxl_regloc_type type,
struct cxl_register_map *map)
{
int rc;
@@ -345,14 +283,7 @@ static int cxl_setup_regs(struct pci_dev *pdev, enum cxl_regloc_type type,
if (rc)
return rc;
rc = cxl_map_regblock(map);
if (rc)
return rc;
rc = cxl_probe_regs(map);
cxl_unmap_regblock(map);
return rc;
return cxl_setup_regs(map);
}
/*
@@ -683,7 +614,7 @@ static int cxl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
dev_warn(&pdev->dev,
"Device DVSEC not present, skip CXL.mem init\n");
rc = cxl_setup_regs(pdev, CXL_REGLOC_RBI_MEMDEV, &map);
rc = cxl_pci_setup_regs(pdev, CXL_REGLOC_RBI_MEMDEV, &map);
if (rc)
return rc;
@@ -696,7 +627,7 @@ static int cxl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
* still be useful for management functions so don't return an error.
*/
cxlds->component_reg_phys = CXL_RESOURCE_NONE;
rc = cxl_setup_regs(pdev, CXL_REGLOC_RBI_COMPONENT, &map);
rc = cxl_pci_setup_regs(pdev, CXL_REGLOC_RBI_COMPONENT, &map);
if (rc)
dev_warn(&pdev->dev, "No component registers (%d)\n", rc);