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Date: Thu, 2 Apr 2020 15:36:28 +1100 From: "Alastair D'Silva" <alastair@...ilva.org> To: "'Dan Williams'" <dan.j.williams@...el.com> Cc: "'Aneesh Kumar K . V'" <aneesh.kumar@...ux.ibm.com>, "'Oliver O'Halloran'" <oohall@...il.com>, "'Benjamin Herrenschmidt'" <benh@...nel.crashing.org>, "'Paul Mackerras'" <paulus@...ba.org>, "'Michael Ellerman'" <mpe@...erman.id.au>, "'Frederic Barrat'" <fbarrat@...ux.ibm.com>, "'Andrew Donnellan'" <ajd@...ux.ibm.com>, "'Arnd Bergmann'" <arnd@...db.de>, "'Greg Kroah-Hartman'" <gregkh@...uxfoundation.org>, "'Vishal Verma'" <vishal.l.verma@...el.com>, "'Dave Jiang'" <dave.jiang@...el.com>, "'Ira Weiny'" <ira.weiny@...el.com>, "'Andrew Morton'" <akpm@...ux-foundation.org>, "'Mauro Carvalho Chehab'" <mchehab+samsung@...nel.org>, "'David S. Miller'" <davem@...emloft.net>, "'Rob Herring'" <robh@...nel.org>, "'Anton Blanchard'" <anton@...abs.org>, "'Krzysztof Kozlowski'" <krzk@...nel.org>, "'Mahesh Salgaonkar'" <mahesh@...ux.vnet.ibm.com>, "'Madhavan Srinivasan'" <maddy@...ux.vnet.ibm.com>, "'Cédric Le Goater'" <clg@...d.org>, "'Anju T Sudhakar'" <anju@...ux.vnet.ibm.com>, "'Hari Bathini'" <hbathini@...ux.ibm.com>, "'Thomas Gleixner'" <tglx@...utronix.de>, "'Greg Kurz'" <groug@...d.org>, "'Nicholas Piggin'" <npiggin@...il.com>, "'Masahiro Yamada'" <yamada.masahiro@...ionext.com>, "'Alexey Kardashevskiy'" <aik@...abs.ru>, "'Linux Kernel Mailing List'" <linux-kernel@...r.kernel.org>, "'linuxppc-dev'" <linuxppc-dev@...ts.ozlabs.org>, "'linux-nvdimm'" <linux-nvdimm@...ts.01.org>, "'Linux MM'" <linux-mm@...ck.org> Subject: RE: [PATCH v4 03/25] powerpc/powernv: Map & release OpenCAPI LPC memory > -----Original Message----- > From: Dan Williams <dan.j.williams@...el.com> > Sent: Wednesday, 1 April 2020 7:49 PM > To: Alastair D'Silva <alastair@...ilva.org> > Cc: Aneesh Kumar K . V <aneesh.kumar@...ux.ibm.com>; Oliver O'Halloran > <oohall@...il.com>; Benjamin Herrenschmidt > <benh@...nel.crashing.org>; Paul Mackerras <paulus@...ba.org>; Michael > Ellerman <mpe@...erman.id.au>; Frederic Barrat <fbarrat@...ux.ibm.com>; > Andrew Donnellan <ajd@...ux.ibm.com>; Arnd Bergmann > <arnd@...db.de>; Greg Kroah-Hartman <gregkh@...uxfoundation.org>; > Vishal Verma <vishal.l.verma@...el.com>; Dave Jiang > <dave.jiang@...el.com>; Ira Weiny <ira.weiny@...el.com>; Andrew Morton > <akpm@...ux-foundation.org>; Mauro Carvalho Chehab > <mchehab+samsung@...nel.org>; David S. Miller <davem@...emloft.net>; > Rob Herring <robh@...nel.org>; Anton Blanchard <anton@...abs.org>; > Krzysztof Kozlowski <krzk@...nel.org>; Mahesh Salgaonkar > <mahesh@...ux.vnet.ibm.com>; Madhavan Srinivasan > <maddy@...ux.vnet.ibm.com>; Cédric Le Goater <clg@...d.org>; Anju T > Sudhakar <anju@...ux.vnet.ibm.com>; Hari Bathini > <hbathini@...ux.ibm.com>; Thomas Gleixner <tglx@...utronix.de>; Greg > Kurz <groug@...d.org>; Nicholas Piggin <npiggin@...il.com>; Masahiro > Yamada <yamada.masahiro@...ionext.com>; Alexey Kardashevskiy > <aik@...abs.ru>; Linux Kernel Mailing List <linux-kernel@...r.kernel.org>; > linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>; linux-nvdimm <linux- > nvdimm@...ts.01.org>; Linux MM <linux-mm@...ck.org> > Subject: Re: [PATCH v4 03/25] powerpc/powernv: Map & release OpenCAPI > LPC memory > > On Sun, Mar 29, 2020 at 10:23 PM Alastair D'Silva <alastair@...ilva.org> > 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 <alastair@...ilva.org> > > Reviewed-by: Andrew Donnellan <ajd@...ux.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; > > Is calling the local variable 'hose' instead of 'host' on purpose? > Yes, this follows the convention used in other functions in this file. > > + 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. Ok > > > + 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? > Yes, I'll add a message. > > > +#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 > > > > > -- > This email has been checked for viruses by AVG. > https://www.avg.com
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