This patch adds OPAL calls to powernv so that the OpenCAPI driver can map & release LPC (Lowest Point of Coherency) memory.
Signed-off-by: Alastair D'Silva <alast...@d-silva.org> Reviewed-by: Andrew Donnellan <a...@linux.ibm.com> --- arch/powerpc/include/asm/pnv-ocxl.h | 2 ++ arch/powerpc/platforms/powernv/ocxl.c | 43 +++++++++++++++++++++++++++ 2 files changed, 45 insertions(+) diff --git a/arch/powerpc/include/asm/pnv-ocxl.h b/arch/powerpc/include/asm/pnv-ocxl.h index 7de82647e761..560a19bb71b7 100644 --- a/arch/powerpc/include/asm/pnv-ocxl.h +++ b/arch/powerpc/include/asm/pnv-ocxl.h @@ -32,5 +32,7 @@ extern int pnv_ocxl_spa_remove_pe_from_cache(void *platform_data, int pe_handle) extern int pnv_ocxl_alloc_xive_irq(u32 *irq, u64 *trigger_addr); extern void pnv_ocxl_free_xive_irq(u32 irq); +u64 pnv_ocxl_platform_lpc_setup(struct pci_dev *pdev, u64 size); +void pnv_ocxl_platform_lpc_release(struct pci_dev *pdev); #endif /* _ASM_PNV_OCXL_H */ diff --git a/arch/powerpc/platforms/powernv/ocxl.c b/arch/powerpc/platforms/powernv/ocxl.c index 8c65aacda9c8..f13119a7c026 100644 --- a/arch/powerpc/platforms/powernv/ocxl.c +++ b/arch/powerpc/platforms/powernv/ocxl.c @@ -475,6 +475,49 @@ void pnv_ocxl_spa_release(void *platform_data) } EXPORT_SYMBOL_GPL(pnv_ocxl_spa_release); +u64 pnv_ocxl_platform_lpc_setup(struct pci_dev *pdev, u64 size) +{ + struct pci_controller *hose = pci_bus_to_host(pdev->bus); + struct pnv_phb *phb = hose->private_data; + u32 bdfn = pci_dev_id(pdev); + __be64 base_addr_be64; + u64 base_addr; + int rc; + + rc = opal_npu_mem_alloc(phb->opal_id, bdfn, size, &base_addr_be64); + if (rc) { + dev_warn(&pdev->dev, + "OPAL could not allocate LPC memory, rc=%d\n", rc); + return 0; + } + + base_addr = be64_to_cpu(base_addr_be64); + +#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE + rc = check_hotplug_memory_addressable(base_addr >> PAGE_SHIFT, + size >> PAGE_SHIFT); + if (rc) + return 0; +#endif + + return base_addr; +} +EXPORT_SYMBOL_GPL(pnv_ocxl_platform_lpc_setup); + +void pnv_ocxl_platform_lpc_release(struct pci_dev *pdev) +{ + struct pci_controller *hose = pci_bus_to_host(pdev->bus); + struct pnv_phb *phb = hose->private_data; + u32 bdfn = pci_dev_id(pdev); + int rc; + + rc = opal_npu_mem_release(phb->opal_id, bdfn); + if (rc) + dev_warn(&pdev->dev, + "OPAL reported rc=%d when releasing LPC memory\n", rc); +} +EXPORT_SYMBOL_GPL(pnv_ocxl_platform_lpc_release); + int pnv_ocxl_spa_remove_pe_from_cache(void *platform_data, int pe_handle) { struct spa_data *data = (struct spa_data *) platform_data; -- 2.24.1