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Date: Thu, 2 Apr 2020 09:51:40 +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 01/25] powerpc/powernv: Add OPAL calls for LPC memory alloc/release
> -----Original Message-----
> From: Dan Williams <dan.j.williams@...el.com>
> Sent: Wednesday, 1 April 2020 7:48 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 01/25] powerpc/powernv: Add OPAL calls for LPC
> memory alloc/release
>
> On Sun, Mar 29, 2020 at 10:23 PM Alastair D'Silva <alastair@...ilva.org>
> wrote:
> >
> > Add OPAL calls for LPC memory alloc/release
> >
>
> 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?
>
These API calls were introduced in the following skiboot commit:
https://github.com/open-power/skiboot/commit/1a548857ce1f02f43585b326a891eed18a7b43b3
I'll add it to the description.
>
> > Signed-off-by: Alastair D'Silva <alastair@...ilva.org>
> > Acked-by: Andrew Donnellan <ajd@...ux.ibm.com>
> > Acked-by: Frederic Barrat <fbarrat@...ux.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
> >
>
>
> --
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--
Alastair D'Silva mob: 0423 762 819
skype: alastair_dsilva msn: alastair@...ilva.org
blog: http://alastair.d-silva.org Twitter: @EvilDeece
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