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From:   "Alastair D'Silva" <alastair@d-silva.org>
To:     "'Dan Williams'" <dan.j.williams@intel.com>
Cc:     "'Aneesh Kumar K . V'" <aneesh.kumar@linux.ibm.com>,
        "'Oliver O'Halloran'" <oohall@gmail.com>,
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        "'Greg Kroah-Hartman'" <gregkh@linuxfoundation.org>,
        "'Vishal Verma'" <vishal.l.verma@intel.com>,
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        "'Rob Herring'" <robh@kernel.org>,
        "'Anton Blanchard'" <anton@ozlabs.org>,
        "'Krzysztof Kozlowski'" <krzk@kernel.org>,
        "'Mahesh Salgaonkar'" <mahesh@linux.vnet.ibm.com>,
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References: <20200327071202.2159885-1-alastair@d-silva.org> <20200327071202.2159885-4-alastair@d-silva.org> <CAPcyv4iGEHJpZctEm+Do1-kOZBUDeKKcREr=BqcK4kCvLWhAQQ@mail.gmail.com>
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Subject: RE: [PATCH v4 03/25] powerpc/powernv: Map & release OpenCAPI LPC memory
Date:   Thu, 2 Apr 2020 15:36:28 +1100
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> -----Original Message-----
> From: Dan Williams <dan.j.williams@intel.com>
> Sent: Wednesday, 1 April 2020 7:49 PM
> To: Alastair D'Silva <alastair@d-silva.org>
> Cc: Aneesh Kumar K . V <aneesh.kumar@linux.ibm.com>; Oliver O'Halloran
> <oohall@gmail.com>; Benjamin Herrenschmidt
> <benh@kernel.crashing.org>; Paul Mackerras <paulus@samba.org>; Michael
> Ellerman <mpe@ellerman.id.au>; Frederic Barrat =
<fbarrat@linux.ibm.com>;
> Andrew Donnellan <ajd@linux.ibm.com>; Arnd Bergmann
> <arnd@arndb.de>; Greg Kroah-Hartman <gregkh@linuxfoundation.org>;
> Vishal Verma <vishal.l.verma@intel.com>; Dave Jiang
> <dave.jiang@intel.com>; Ira Weiny <ira.weiny@intel.com>; Andrew Morton
> <akpm@linux-foundation.org>; Mauro Carvalho Chehab
> <mchehab+samsung@kernel.org>; David S. Miller <davem@davemloft.net>;
> Rob Herring <robh@kernel.org>; Anton Blanchard <anton@ozlabs.org>;
> Krzysztof Kozlowski <krzk@kernel.org>; Mahesh Salgaonkar
> <mahesh@linux.vnet.ibm.com>; Madhavan Srinivasan
> <maddy@linux.vnet.ibm.com>; C=C3=A9dric Le Goater <clg@kaod.org>; Anju =
T
> Sudhakar <anju@linux.vnet.ibm.com>; Hari Bathini
> <hbathini@linux.ibm.com>; Thomas Gleixner <tglx@linutronix.de>; Greg
> Kurz <groug@kaod.org>; Nicholas Piggin <npiggin@gmail.com>; Masahiro
> Yamada <yamada.masahiro@socionext.com>; Alexey Kardashevskiy
> <aik@ozlabs.ru>; Linux Kernel Mailing List =
<linux-kernel@vger.kernel.org>;
> linuxppc-dev <linuxppc-dev@lists.ozlabs.org>; linux-nvdimm <linux-
> nvdimm@lists.01.org>; Linux MM <linux-mm@kvack.org>
> Subject: Re: [PATCH v4 03/25] powerpc/powernv: Map & release OpenCAPI
> LPC memory
>=20
> On Sun, Mar 29, 2020 at 10:23 PM Alastair D'Silva =
<alastair@d-silva.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@d-silva.org>
> > Reviewed-by: Andrew Donnellan <ajd@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 =3D pci_bus_to_host(pdev->bus);
> > +       struct pnv_phb *phb =3D hose->private_data;
>=20
> Is calling the local variable 'hose' instead of 'host' on purpose?
>=20

Yes, this follows the convention used in other functions in this file.

> > +       u32 bdfn =3D pci_dev_id(pdev);
> > +       __be64 base_addr_be64;
> > +       u64 base_addr;
> > +       int rc;
> > +
> > +       rc =3D 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=3D%d\n", rc);
> > +               return 0;
> > +       }
> > +
> > +       base_addr =3D be64_to_cpu(base_addr_be64);
> > +
> > +#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
>=20
> With the proposed cleanup in patch2 the ifdef can be elided here.

Ok
>=20
> > +       rc =3D check_hotplug_memory_addressable(base_addr >> =
PAGE_SHIFT,
> > +                                             size >> PAGE_SHIFT);
> > +       if (rc)
> > +               return 0;
>=20
> Is this an error worth logging if someone is wondering why their =
device is not
> showing up?
>=20

Yes, I'll add a message.

>=20
> > +#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 =3D pci_bus_to_host(pdev->bus);
> > +       struct pnv_phb *phb =3D hose->private_data;
> > +       u32 bdfn =3D pci_dev_id(pdev);
> > +       int rc;
> > +
> > +       rc =3D opal_npu_mem_release(phb->opal_id, bdfn);
> > +       if (rc)
> > +               dev_warn(&pdev->dev,
> > +                        "OPAL reported rc=3D%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 =3D (struct spa_data *) platform_data;
> > --
> > 2.24.1
> >
>=20
>=20
> --
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