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V" , "Oliver O'Halloran" , Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , Frederic Barrat , Andrew Donnellan , Arnd Bergmann , Greg Kroah-Hartman , Vishal Verma , Dave Jiang , Ira Weiny , Andrew Morton , Mauro Carvalho Chehab , "David S. Miller" , Rob Herring , Anton Blanchard , Krzysztof Kozlowski , Mahesh Salgaonkar , Madhavan Srinivasan , =?UTF-8?Q?C=C3=A9dric_Le_Goater?= , Anju T Sudhakar , Hari Bathini , Thomas Gleixner , Greg Kurz , Nicholas Piggin , Masahiro Yamada , Alexey Kardashevskiy , Linux Kernel Mailing List , linuxppc-dev , linux-nvdimm , Linux MM Content-Type: text/plain; charset="UTF-8" X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Sun, Mar 29, 2020 at 10:23 PM Alastair D'Silva wrote: > > 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 > Reviewed-by: Andrew Donnellan > --- > 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; Is calling the local variable 'hose' instead of 'host' on purpose? > + 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 With the proposed cleanup in patch2 the ifdef can be elided here. > + rc = check_hotplug_memory_addressable(base_addr >> PAGE_SHIFT, > + size >> PAGE_SHIFT); > + if (rc) > + return 0; Is this an error worth logging if someone is wondering why their device is not showing up? > +#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 >