From 9a016527dcb71e2ecadfeacf52122a79b428790c Mon Sep 17 00:00:00 2001 From: Ira Weiny Date: Thu, 3 Jun 2021 17:53:16 -0700 Subject: [PATCH] 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 Signed-off-by: Ira Weiny Link: https://lore.kernel.org/r/20210604005316.4187340-1-ira.weiny@intel.com Signed-off-by: Dan Williams --- drivers/cxl/core.c | 36 ++++++++++++++++++++++++++++++++---- 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)