diff options
| author | Ira Weiny <ira.weiny@intel.com> | 2021-06-04 03:53:16 +0300 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2021-06-06 03:38:45 +0300 |
| commit | 9a016527dcb71e2ecadfeacf52122a79b428790c (patch) | |
| tree | e5ac0fc2ca3323e9a6ae003ec91bbd530e2e3cbd /drivers/cxl | |
| parent | 30af97296f48d84bc4a6abbaabb92c796a84ca57 (diff) | |
| download | linux-9a016527dcb71e2ecadfeacf52122a79b428790c.tar.xz | |
cxl/pci: Reserve individual register block regions
Some hardware implementations mix component and device registers into
the same BAR and the driver stack is going to need independent mapping
implementations for those 2 cases. Furthermore, it will be nice to have
finer grained mappings should user space want to map some register
blocks.
Now that individual register blocks are mapped; those blocks regions
should be reserved individually to fully separate the register blocks.
Release the 'global' memory reservation and create individual register
block region reservations through devm.
NOTE: pci_release_mem_regions() is still compatible with
pcim_enable_device() because it removes the automatic region release
when called. So preserve the pcim_enable_device() so that the pcim
interface can be called if needed.
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Link: https://lore.kernel.org/r/20210604005316.4187340-1-ira.weiny@intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/cxl')
| -rw-r--r-- | drivers/cxl/core.c | 36 | ||||
| -rw-r--r-- | drivers/cxl/pci.c | 2 |
2 files changed, 34 insertions, 4 deletions
diff --git a/drivers/cxl/core.c b/drivers/cxl/core.c index f836aaab03e0..c1efa11207b5 100644 --- a/drivers/cxl/core.c +++ b/drivers/cxl/core.c @@ -79,11 +79,33 @@ void cxl_probe_device_regs(struct device *dev, void __iomem *base, } EXPORT_SYMBOL_GPL(cxl_probe_device_regs); +static void __iomem *devm_cxl_iomap_block(struct pci_dev *pdev, + resource_size_t addr, + resource_size_t length) +{ + struct device *dev = &pdev->dev; + void __iomem *ret_val; + struct resource *res; + + res = devm_request_mem_region(dev, addr, length, pci_name(pdev)); + if (!res) { + resource_size_t end = addr + length - 1; + + dev_err(dev, "Failed to request region %pa-%pa\n", &addr, &end); + return NULL; + } + + ret_val = devm_ioremap(dev, addr, length); + if (!ret_val) + dev_err(dev, "Failed to map region %pr\n", res); + + return ret_val; +} + int cxl_map_device_regs(struct pci_dev *pdev, struct cxl_device_regs *regs, struct cxl_register_map *map) { - struct device *dev = &pdev->dev; resource_size_t phys_addr; phys_addr = pci_resource_start(pdev, map->barno); @@ -95,7 +117,9 @@ int cxl_map_device_regs(struct pci_dev *pdev, addr = phys_addr + map->device_map.status.offset; length = map->device_map.status.size; - regs->status = devm_ioremap(dev, addr, length); + regs->status = devm_cxl_iomap_block(pdev, addr, length); + if (!regs->status) + return -ENOMEM; } if (map->device_map.mbox.valid) { @@ -104,7 +128,9 @@ int cxl_map_device_regs(struct pci_dev *pdev, addr = phys_addr + map->device_map.mbox.offset; length = map->device_map.mbox.size; - regs->mbox = devm_ioremap(dev, addr, length); + regs->mbox = devm_cxl_iomap_block(pdev, addr, length); + if (!regs->mbox) + return -ENOMEM; } if (map->device_map.memdev.valid) { @@ -113,7 +139,9 @@ int cxl_map_device_regs(struct pci_dev *pdev, addr = phys_addr + map->device_map.memdev.offset; length = map->device_map.memdev.size; - regs->memdev = devm_ioremap(dev, addr, length); + regs->memdev = devm_cxl_iomap_block(pdev, addr, length); + if (!regs->memdev) + return -ENOMEM; } return 0; diff --git a/drivers/cxl/pci.c b/drivers/cxl/pci.c index 3ffd5fad74b4..e1a2dbc2886b 100644 --- a/drivers/cxl/pci.c +++ b/drivers/cxl/pci.c @@ -1110,6 +1110,8 @@ static int cxl_mem_setup_regs(struct cxl_mem *cxlm) goto free_maps; } + pci_release_mem_regions(pdev); + list_for_each_entry(map, ®ister_maps, list) { ret = cxl_map_regs(cxlm, map); if (ret) |