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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>,
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References: <20200327071202.2159885-1-alastair@d-silva.org> <20200327071202.2159885-2-alastair@d-silva.org> <CAPcyv4hX9RTWKSLB8OcYY6MK-z5u5WWSaYSGa-8oqPbWU7st8w@mail.gmail.com>
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Subject: RE: [PATCH v4 01/25] powerpc/powernv: Add OPAL calls for LPC memory alloc/release
Date:   Thu, 2 Apr 2020 09:51:40 +1100
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> -----Original Message-----
> From: Dan Williams <dan.j.williams@intel.com>
> Sent: Wednesday, 1 April 2020 7:48 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 01/25] powerpc/powernv: Add OPAL calls for LPC
> memory alloc/release
>=20
> On Sun, Mar 29, 2020 at 10:23 PM Alastair D'Silva =
<alastair@d-silva.org>
> wrote:
> >
> > Add OPAL calls for LPC memory alloc/release
> >
>=20
> This seems to be referencing an existing api definition, can you =
include a
> pointer to the spec in case someone wanted to understand what these
> routines do? I suspect this is not allocating memory in the =
traditional sense as
> much as it's allocating physical address space for a device to be =
mapped?
>=20

These API calls were introduced in the following skiboot commit:
https://github.com/open-power/skiboot/commit/1a548857ce1f02f43585b326a891=
eed18a7b43b3

I'll add it to the description.

>=20
> > Signed-off-by: Alastair D'Silva <alastair@d-silva.org>
> > Acked-by: Andrew Donnellan <ajd@linux.ibm.com>
> > Acked-by: Frederic Barrat <fbarrat@linux.ibm.com>
> > ---
> >  arch/powerpc/include/asm/opal-api.h        | 2 ++
> >  arch/powerpc/include/asm/opal.h            | 2 ++
> >  arch/powerpc/platforms/powernv/opal-call.c | 2 ++
> >  3 files changed, 6 insertions(+)
> >
> > diff --git a/arch/powerpc/include/asm/opal-api.h
> > b/arch/powerpc/include/asm/opal-api.h
> > index c1f25a760eb1..9298e603001b 100644
> > --- a/arch/powerpc/include/asm/opal-api.h
> > +++ b/arch/powerpc/include/asm/opal-api.h
> > @@ -208,6 +208,8 @@
> >  #define OPAL_HANDLE_HMI2                       166
> >  #define        OPAL_NX_COPROC_INIT                     167
> >  #define OPAL_XIVE_GET_VP_STATE                 170
> > +#define OPAL_NPU_MEM_ALLOC                     171
> > +#define OPAL_NPU_MEM_RELEASE                   172
> >  #define OPAL_MPIPL_UPDATE                      173
> >  #define OPAL_MPIPL_REGISTER_TAG                        174
> >  #define OPAL_MPIPL_QUERY_TAG                   175
> > diff --git a/arch/powerpc/include/asm/opal.h
> > b/arch/powerpc/include/asm/opal.h index 9986ac34b8e2..301fea46c7ca
> > 100644
> > --- a/arch/powerpc/include/asm/opal.h
> > +++ b/arch/powerpc/include/asm/opal.h
> > @@ -39,6 +39,8 @@ int64_t opal_npu_spa_clear_cache(uint64_t phb_id,
> uint32_t bdfn,
> >                                 uint64_t PE_handle);  int64_t
> > opal_npu_tl_set(uint64_t phb_id, uint32_t bdfn, long cap,
> >                         uint64_t rate_phys, uint32_t size);
> > +int64_t opal_npu_mem_alloc(u64 phb_id, u32 bdfn, u64 size, __be64
> > +*bar); int64_t opal_npu_mem_release(u64 phb_id, u32 bdfn);
> >
> >  int64_t opal_console_write(int64_t term_number, __be64 *length,
> >                            const uint8_t *buffer); diff --git
> > a/arch/powerpc/platforms/powernv/opal-call.c
> > b/arch/powerpc/platforms/powernv/opal-call.c
> > index 5cd0f52d258f..f26e58b72c04 100644
> > --- a/arch/powerpc/platforms/powernv/opal-call.c
> > +++ b/arch/powerpc/platforms/powernv/opal-call.c
> > @@ -287,6 +287,8 @@ OPAL_CALL(opal_pci_set_pbcq_tunnel_bar,
> OPAL_PCI_SET_PBCQ_TUNNEL_BAR);
> >  OPAL_CALL(opal_sensor_read_u64,
> OPAL_SENSOR_READ_U64);
> >  OPAL_CALL(opal_sensor_group_enable,
> OPAL_SENSOR_GROUP_ENABLE);
> >  OPAL_CALL(opal_nx_coproc_init,                 =
OPAL_NX_COPROC_INIT);
> > +OPAL_CALL(opal_npu_mem_alloc,                  OPAL_NPU_MEM_ALLOC);
> > +OPAL_CALL(opal_npu_mem_release,
> OPAL_NPU_MEM_RELEASE);
> >  OPAL_CALL(opal_mpipl_update,                   OPAL_MPIPL_UPDATE);
> >  OPAL_CALL(opal_mpipl_register_tag,
> OPAL_MPIPL_REGISTER_TAG);
> >  OPAL_CALL(opal_mpipl_query_tag,
> OPAL_MPIPL_QUERY_TAG);
> > --
> > 2.24.1
> >
>=20
>=20
> --
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--=20
Alastair D'Silva           mob: 0423 762 819
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