On Tue, Nov 14, 2017 at 05:12:05PM -0500, Jim Quinlan wrote:
> From: Florian Fainelli <[email protected]>
>
> This commit adds a memory API suitable for ascertaining the sizes of
> each of the N memory controllers in a Broadcom STB chip. Its first
> user will be the Broadcom STB PCIe root complex driver, which needs
> to know these sizes to properly set up DMA mappings for inbound
> regions.
>
> We cannot use memblock here or anything like what Linux provides
> because it collapses adjacent regions within a larger block, and here
> we actually need per-memory controller addresses and sizes, which is
> why we resort to manual DT parsing.
>
> Signed-off-by: Jim Quinlan <[email protected]>
> ---
> drivers/soc/bcm/brcmstb/Makefile | 2 +-
> drivers/soc/bcm/brcmstb/memory.c | 172 +++++++++++++++++++++++++++++++++++++++
> include/soc/brcmstb/memory_api.h | 25 ++++++
> 3 files changed, 198 insertions(+), 1 deletion(-)
> create mode 100644 drivers/soc/bcm/brcmstb/memory.c
> create mode 100644 include/soc/brcmstb/memory_api.h
>
> diff --git a/drivers/soc/bcm/brcmstb/Makefile b/drivers/soc/bcm/brcmstb/Makefile
> index 9120b27..4cea7b6 100644
> --- a/drivers/soc/bcm/brcmstb/Makefile
> +++ b/drivers/soc/bcm/brcmstb/Makefile
> @@ -1 +1 @@
> -obj-y += common.o biuctrl.o
> +obj-y += common.o biuctrl.o memory.o
> diff --git a/drivers/soc/bcm/brcmstb/memory.c b/drivers/soc/bcm/brcmstb/memory.c
> new file mode 100644
> index 0000000..eb647ad9
> --- /dev/null
> +++ b/drivers/soc/bcm/brcmstb/memory.c
I sort of assume based on [1] that every new file should have an SPDX
identifier ("The Linux kernel requires the precise SPDX identifier in
all source files") and that the actual text of the GPL can be omitted.
Only a few files in drivers/pci currently have an SPDX identifier. I
don't know if that's oversight or work-in-progress or what.
[1] https://lkml.kernel.org/r/[email protected]
> @@ -0,0 +1,172 @@
> +/*
> + * Copyright ? 2015-2017 Broadcom
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * A copy of the GPL is available at
> + * http://www.broadcom.com/licenses/GPLv2.php or from the Free Software
> + * Foundation at https://www.gnu.org/licenses/ .
On 12/05/2017 12:59 PM, Bjorn Helgaas wrote:
> On Tue, Nov 14, 2017 at 05:12:05PM -0500, Jim Quinlan wrote:
>> From: Florian Fainelli <[email protected]>
>>
>> This commit adds a memory API suitable for ascertaining the sizes of
>> each of the N memory controllers in a Broadcom STB chip. Its first
>> user will be the Broadcom STB PCIe root complex driver, which needs
>> to know these sizes to properly set up DMA mappings for inbound
>> regions.
>>
>> We cannot use memblock here or anything like what Linux provides
>> because it collapses adjacent regions within a larger block, and here
>> we actually need per-memory controller addresses and sizes, which is
>> why we resort to manual DT parsing.
>>
>> Signed-off-by: Jim Quinlan <[email protected]>
>> ---
>> drivers/soc/bcm/brcmstb/Makefile | 2 +-
>> drivers/soc/bcm/brcmstb/memory.c | 172 +++++++++++++++++++++++++++++++++++++++
>> include/soc/brcmstb/memory_api.h | 25 ++++++
>> 3 files changed, 198 insertions(+), 1 deletion(-)
>> create mode 100644 drivers/soc/bcm/brcmstb/memory.c
>> create mode 100644 include/soc/brcmstb/memory_api.h
>>
>> diff --git a/drivers/soc/bcm/brcmstb/Makefile b/drivers/soc/bcm/brcmstb/Makefile
>> index 9120b27..4cea7b6 100644
>> --- a/drivers/soc/bcm/brcmstb/Makefile
>> +++ b/drivers/soc/bcm/brcmstb/Makefile
>> @@ -1 +1 @@
>> -obj-y += common.o biuctrl.o
>> +obj-y += common.o biuctrl.o memory.o
>> diff --git a/drivers/soc/bcm/brcmstb/memory.c b/drivers/soc/bcm/brcmstb/memory.c
>> new file mode 100644
>> index 0000000..eb647ad9
>> --- /dev/null
>> +++ b/drivers/soc/bcm/brcmstb/memory.c
>
> I sort of assume based on [1] that every new file should have an SPDX
> identifier ("The Linux kernel requires the precise SPDX identifier in
> all source files") and that the actual text of the GPL can be omitted.
>
> Only a few files in drivers/pci currently have an SPDX identifier. I
> don't know if that's oversight or work-in-progress or what.
>
> [1] https://lkml.kernel.org/r/[email protected]
This was submitted before SPDX was consistently enforced tree wide, so
yes we should fix this.
Any other comment besides that?
--
Florian
On Tue, Dec 5, 2017 at 3:59 PM, Bjorn Helgaas <[email protected]> wrote:
> On Tue, Nov 14, 2017 at 05:12:05PM -0500, Jim Quinlan wrote:
>> From: Florian Fainelli <[email protected]>
>>
>> This commit adds a memory API suitable for ascertaining the sizes of
>> each of the N memory controllers in a Broadcom STB chip. Its first
>> user will be the Broadcom STB PCIe root complex driver, which needs
>> to know these sizes to properly set up DMA mappings for inbound
>> regions.
>>
>> We cannot use memblock here or anything like what Linux provides
>> because it collapses adjacent regions within a larger block, and here
>> we actually need per-memory controller addresses and sizes, which is
>> why we resort to manual DT parsing.
>>
>> Signed-off-by: Jim Quinlan <[email protected]>
>> ---
>> drivers/soc/bcm/brcmstb/Makefile | 2 +-
>> drivers/soc/bcm/brcmstb/memory.c | 172 +++++++++++++++++++++++++++++++++++++++
>> include/soc/brcmstb/memory_api.h | 25 ++++++
>> 3 files changed, 198 insertions(+), 1 deletion(-)
>> create mode 100644 drivers/soc/bcm/brcmstb/memory.c
>> create mode 100644 include/soc/brcmstb/memory_api.h
>>
>> diff --git a/drivers/soc/bcm/brcmstb/Makefile b/drivers/soc/bcm/brcmstb/Makefile
>> index 9120b27..4cea7b6 100644
>> --- a/drivers/soc/bcm/brcmstb/Makefile
>> +++ b/drivers/soc/bcm/brcmstb/Makefile
>> @@ -1 +1 @@
>> -obj-y += common.o biuctrl.o
>> +obj-y += common.o biuctrl.o memory.o
>> diff --git a/drivers/soc/bcm/brcmstb/memory.c b/drivers/soc/bcm/brcmstb/memory.c
>> new file mode 100644
>> index 0000000..eb647ad9
>> --- /dev/null
>> +++ b/drivers/soc/bcm/brcmstb/memory.c
>
> I sort of assume based on [1] that every new file should have an SPDX
> identifier ("The Linux kernel requires the precise SPDX identifier in
> all source files") and that the actual text of the GPL can be omitted.
>
> Only a few files in drivers/pci currently have an SPDX identifier. I
> don't know if that's oversight or work-in-progress or what.
>
> [1] https://lkml.kernel.org/r/[email protected]
>
Bjorn, Did you get a chance to review the other commits of this
submission (V3)? I would like any additional feedback before I send
out a V4 with SPDX fixes. Thanks, JimQ
>> @@ -0,0 +1,172 @@
>> +/*
>> + * Copyright © 2015-2017 Broadcom
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License version 2 as
>> + * published by the Free Software Foundation.
>> + *
>> + * This program is distributed in the hope that it will be useful,
>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
>> + * GNU General Public License for more details.
>> + *
>> + * A copy of the GPL is available at
>> + * http://www.broadcom.com/licenses/GPLv2.php or from the Free Software
>> + * Foundation at https://www.gnu.org/licenses/ .
[+cc Lorenzo]
On Tue, Dec 12, 2017 at 03:53:28PM -0500, Jim Quinlan wrote:
> On Tue, Dec 5, 2017 at 3:59 PM, Bjorn Helgaas <[email protected]> wrote:
> > On Tue, Nov 14, 2017 at 05:12:05PM -0500, Jim Quinlan wrote:
> >> From: Florian Fainelli <[email protected]>
> >>
> >> This commit adds a memory API suitable for ascertaining the sizes of
> >> each of the N memory controllers in a Broadcom STB chip. Its first
> >> user will be the Broadcom STB PCIe root complex driver, which needs
> >> to know these sizes to properly set up DMA mappings for inbound
> >> regions.
> >>
> >> We cannot use memblock here or anything like what Linux provides
> >> because it collapses adjacent regions within a larger block, and here
> >> we actually need per-memory controller addresses and sizes, which is
> >> why we resort to manual DT parsing.
> >>
> >> Signed-off-by: Jim Quinlan <[email protected]>
> >> ---
> >> drivers/soc/bcm/brcmstb/Makefile | 2 +-
> >> drivers/soc/bcm/brcmstb/memory.c | 172 +++++++++++++++++++++++++++++++++++++++
> >> include/soc/brcmstb/memory_api.h | 25 ++++++
> >> 3 files changed, 198 insertions(+), 1 deletion(-)
> >> create mode 100644 drivers/soc/bcm/brcmstb/memory.c
> >> create mode 100644 include/soc/brcmstb/memory_api.h
> >>
> >> diff --git a/drivers/soc/bcm/brcmstb/Makefile b/drivers/soc/bcm/brcmstb/Makefile
> >> index 9120b27..4cea7b6 100644
> >> --- a/drivers/soc/bcm/brcmstb/Makefile
> >> +++ b/drivers/soc/bcm/brcmstb/Makefile
> >> @@ -1 +1 @@
> >> -obj-y += common.o biuctrl.o
> >> +obj-y += common.o biuctrl.o memory.o
> >> diff --git a/drivers/soc/bcm/brcmstb/memory.c b/drivers/soc/bcm/brcmstb/memory.c
> >> new file mode 100644
> >> index 0000000..eb647ad9
> >> --- /dev/null
> >> +++ b/drivers/soc/bcm/brcmstb/memory.c
> >
> > I sort of assume based on [1] that every new file should have an SPDX
> > identifier ("The Linux kernel requires the precise SPDX identifier in
> > all source files") and that the actual text of the GPL can be omitted.
> >
> > Only a few files in drivers/pci currently have an SPDX identifier. I
> > don't know if that's oversight or work-in-progress or what.
> >
> > [1] https://lkml.kernel.org/r/[email protected]
> >
>
> Bjorn, Did you get a chance to review the other commits of this
> submission (V3)? I would like any additional feedback before I send
> out a V4 with SPDX fixes. Thanks, JimQ
Lorenzo is taking over drivers/pci/host/* and he'll no doubt have some
comments when he gets to this. I'll point out a few quick formatting
things in the meantime.
> >> @@ -0,0 +1,172 @@
> >> +/*
> >> + * Copyright ? 2015-2017 Broadcom
> >> + *
> >> + * This program is free software; you can redistribute it and/or modify
> >> + * it under the terms of the GNU General Public License version 2 as
> >> + * published by the Free Software Foundation.
> >> + *
> >> + * This program is distributed in the hope that it will be useful,
> >> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> >> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> >> + * GNU General Public License for more details.
> >> + *
> >> + * A copy of the GPL is available at
> >> + * http://www.broadcom.com/licenses/GPLv2.php or from the Free Software
> >> + * Foundation at https://www.gnu.org/licenses/ .
On Tue, Dec 12, 2017 at 03:14:04PM -0600, Bjorn Helgaas wrote:
> [+cc Lorenzo]
>
> On Tue, Dec 12, 2017 at 03:53:28PM -0500, Jim Quinlan wrote:
> > On Tue, Dec 5, 2017 at 3:59 PM, Bjorn Helgaas <[email protected]> wrote:
> > > On Tue, Nov 14, 2017 at 05:12:05PM -0500, Jim Quinlan wrote:
> > >> From: Florian Fainelli <[email protected]>
> > >>
> > >> This commit adds a memory API suitable for ascertaining the sizes of
> > >> each of the N memory controllers in a Broadcom STB chip. Its first
> > >> user will be the Broadcom STB PCIe root complex driver, which needs
> > >> to know these sizes to properly set up DMA mappings for inbound
> > >> regions.
> > >>
> > >> We cannot use memblock here or anything like what Linux provides
> > >> because it collapses adjacent regions within a larger block, and here
> > >> we actually need per-memory controller addresses and sizes, which is
> > >> why we resort to manual DT parsing.
> > >>
> > >> Signed-off-by: Jim Quinlan <[email protected]>
> > >> ---
> > >> drivers/soc/bcm/brcmstb/Makefile | 2 +-
> > >> drivers/soc/bcm/brcmstb/memory.c | 172 +++++++++++++++++++++++++++++++++++++++
> > >> include/soc/brcmstb/memory_api.h | 25 ++++++
> > >> 3 files changed, 198 insertions(+), 1 deletion(-)
> > >> create mode 100644 drivers/soc/bcm/brcmstb/memory.c
> > >> create mode 100644 include/soc/brcmstb/memory_api.h
> > >>
> > >> diff --git a/drivers/soc/bcm/brcmstb/Makefile b/drivers/soc/bcm/brcmstb/Makefile
> > >> index 9120b27..4cea7b6 100644
> > >> --- a/drivers/soc/bcm/brcmstb/Makefile
> > >> +++ b/drivers/soc/bcm/brcmstb/Makefile
> > >> @@ -1 +1 @@
> > >> -obj-y += common.o biuctrl.o
> > >> +obj-y += common.o biuctrl.o memory.o
> > >> diff --git a/drivers/soc/bcm/brcmstb/memory.c b/drivers/soc/bcm/brcmstb/memory.c
> > >> new file mode 100644
> > >> index 0000000..eb647ad9
> > >> --- /dev/null
> > >> +++ b/drivers/soc/bcm/brcmstb/memory.c
> > >
> > > I sort of assume based on [1] that every new file should have an SPDX
> > > identifier ("The Linux kernel requires the precise SPDX identifier in
> > > all source files") and that the actual text of the GPL can be omitted.
> > >
> > > Only a few files in drivers/pci currently have an SPDX identifier. I
> > > don't know if that's oversight or work-in-progress or what.
> > >
> > > [1] https://lkml.kernel.org/r/[email protected]
> > >
> >
> > Bjorn, Did you get a chance to review the other commits of this
> > submission (V3)? I would like any additional feedback before I send
> > out a V4 with SPDX fixes. Thanks, JimQ
>
> Lorenzo is taking over drivers/pci/host/* and he'll no doubt have some
> comments when he gets to this. I'll point out a few quick formatting
> things in the meantime.
I need some time to review the code but overall I am quite worried about
patches 1 and 4 in particular, it is ok to have platform host bridge
drivers but we can't rewrite a DMA layer for a specific host bridge, I
really do not like that - it is just not manageable from a maintenance
perspective for the mainline kernel.
Lorenzo
On Fri, Dec 15, 2017 at 12:14 PM, Lorenzo Pieralisi
<[email protected]> wrote:
> On Tue, Dec 12, 2017 at 03:14:04PM -0600, Bjorn Helgaas wrote:
>> [+cc Lorenzo]
>>
>> On Tue, Dec 12, 2017 at 03:53:28PM -0500, Jim Quinlan wrote:
>> > On Tue, Dec 5, 2017 at 3:59 PM, Bjorn Helgaas <[email protected]> wrote:
>> > > On Tue, Nov 14, 2017 at 05:12:05PM -0500, Jim Quinlan wrote:
>> > >> From: Florian Fainelli <[email protected]>
>> > >>
>> > >> This commit adds a memory API suitable for ascertaining the sizes of
>> > >> each of the N memory controllers in a Broadcom STB chip. Its first
>> > >> user will be the Broadcom STB PCIe root complex driver, which needs
>> > >> to know these sizes to properly set up DMA mappings for inbound
>> > >> regions.
>> > >>
>> > >> We cannot use memblock here or anything like what Linux provides
>> > >> because it collapses adjacent regions within a larger block, and here
>> > >> we actually need per-memory controller addresses and sizes, which is
>> > >> why we resort to manual DT parsing.
>> > >>
>> > >> Signed-off-by: Jim Quinlan <[email protected]>
>> > >> ---
>> > >> drivers/soc/bcm/brcmstb/Makefile | 2 +-
>> > >> drivers/soc/bcm/brcmstb/memory.c | 172 +++++++++++++++++++++++++++++++++++++++
>> > >> include/soc/brcmstb/memory_api.h | 25 ++++++
>> > >> 3 files changed, 198 insertions(+), 1 deletion(-)
>> > >> create mode 100644 drivers/soc/bcm/brcmstb/memory.c
>> > >> create mode 100644 include/soc/brcmstb/memory_api.h
>> > >>
>> > >> diff --git a/drivers/soc/bcm/brcmstb/Makefile b/drivers/soc/bcm/brcmstb/Makefile
>> > >> index 9120b27..4cea7b6 100644
>> > >> --- a/drivers/soc/bcm/brcmstb/Makefile
>> > >> +++ b/drivers/soc/bcm/brcmstb/Makefile
>> > >> @@ -1 +1 @@
>> > >> -obj-y += common.o biuctrl.o
>> > >> +obj-y += common.o biuctrl.o memory.o
>> > >> diff --git a/drivers/soc/bcm/brcmstb/memory.c b/drivers/soc/bcm/brcmstb/memory.c
>> > >> new file mode 100644
>> > >> index 0000000..eb647ad9
>> > >> --- /dev/null
>> > >> +++ b/drivers/soc/bcm/brcmstb/memory.c
>> > >
>> > > I sort of assume based on [1] that every new file should have an SPDX
>> > > identifier ("The Linux kernel requires the precise SPDX identifier in
>> > > all source files") and that the actual text of the GPL can be omitted.
>> > >
>> > > Only a few files in drivers/pci currently have an SPDX identifier. I
>> > > don't know if that's oversight or work-in-progress or what.
>> > >
>> > > [1] https://lkml.kernel.org/r/[email protected]
>> > >
>> >
>> > Bjorn, Did you get a chance to review the other commits of this
>> > submission (V3)? I would like any additional feedback before I send
>> > out a V4 with SPDX fixes. Thanks, JimQ
>>
>> Lorenzo is taking over drivers/pci/host/* and he'll no doubt have some
>> comments when he gets to this. I'll point out a few quick formatting
>> things in the meantime.
>
> I need some time to review the code but overall I am quite worried about
> patches 1 and 4 in particular, it is ok to have platform host bridge
> drivers but we can't rewrite a DMA layer for a specific host bridge, I
> really do not like that - it is just not manageable from a maintenance
> perspective for the mainline kernel.
>
> Lorenzo
Hi Lorenzo,
First I note that the file drivers/pci/host/vmd.c appears to do the
same thing -- rewrite a layer over the DMA ops. Secondly, there seems
to be no other way to accomplish what we need to do, especially that
will work with ARM, ARM64, and MIPs. Someone raised the same point
you did and suggested I involve ARM/ARM64 maintainers, so I expanded
my "--to" list to include Russell. I'm open to ideas. I've asked the
HW PCIe folks to redesign the controller to accommodate an
identity-map for inbound memory, but it will be a while if that
happens, if ever. --Jim