From: "liviu.dudau@arm.com" <liviu.dudau@arm.com>
To: Gabriele Paoloni <gabriele.paoloni@huawei.com>
Cc: Yuanzhichang <yuanzhichang@hisilicon.com>,
"catalin.marinas@arm.com" <catalin.marinas@arm.com>,
"will.deacon@arm.com" <will.deacon@arm.com>,
"robh+dt@kernel.org" <robh+dt@kernel.org>,
"bhelgaas@google.com" <bhelgaas@google.com>,
"mark.rutland@arm.com" <mark.rutland@arm.com>,
"olof@lixom.net" <olof@lixom.net>,
"arnd@arndb.de" <arnd@arndb.de>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"lorenzo.pieralisi@arm.com" <lorenzo.pieralisi@arm.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Linuxarm <linuxarm@huawei.com>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
"linux-serial@vger.kernel.org" <linux-serial@vger.kernel.org>,
"minyard@acm.org" <minyard@acm.org>,
"benh@kernel.crashing.org" <benh@kernel.crashing.org>,
"zourongrong@gmail.com" <zourongrong@gmail.com>,
John Garry <john.garry@huawei.com>,
"zhichang.yuan02@gmail.com" <zhichang.yuan02@gmail.com>,
"kantyzc@163.com" <kantyzc@163.com>,
"xuwei (O)" <xuwei5@hisilicon.com>
Subject: Re: [PATCH V5 2/3] ARM64 LPC: Add missing range exception for special ISA
Date: Wed, 9 Nov 2016 16:50:44 +0000 [thread overview]
Message-ID: <20161109165044.GE10219@e106497-lin.cambridge.arm.com> (raw)
In-Reply-To: <EE11001F9E5DDD47B7634E2F8A612F2E1F8F27C0@lhreml507-mbx>
On Wed, Nov 09, 2016 at 04:16:17PM +0000, Gabriele Paoloni wrote:
> Hi Liviu
>
> Thanks for reviewing
>
[removed some irrelevant part of discussion, avoid crazy formatting]
> > > +/**
> > > + * addr_is_indirect_io - check whether the input taddr is for
> > indirectIO.
> > > + * @taddr: the io address to be checked.
> > > + *
> > > + * Returns 1 when taddr is in the range; otherwise return 0.
> > > + */
> > > +int addr_is_indirect_io(u64 taddr)
> > > +{
> > > + if (arm64_extio_ops->start > taddr || arm64_extio_ops->end <
> > taddr)
> >
> > start >= taddr ?
>
> Nope... if (taddr < arm64_extio_ops->start || taddr > arm64_extio_ops->end)
> then taddr is outside the range [start; end] and will return 0; otherwise
> it will return 1...
Oops, sorry, did not pay attention to the returned value. The check is
correct as it is, no need to change then.
>
> >
> > > + return 0;
> > > +
> > > + return 1;
> > > +}
> > >
> > > BUILD_EXTIO(b, u8)
> > >
> > > diff --git a/drivers/of/address.c b/drivers/of/address.c
> > > index 02b2903..cc2a05d 100644
> > > --- a/drivers/of/address.c
> > > +++ b/drivers/of/address.c
> > > @@ -479,6 +479,50 @@ static int of_empty_ranges_quirk(struct
> > device_node *np)
> > > return false;
> > > }
> > >
> > > +
> > > +/*
> > > + * of_isa_indirect_io - get the IO address from some isa reg
> > property value.
> > > + * For some isa/lpc devices, no ranges property in ancestor node.
> > > + * The device addresses are described directly in their regs
> > property.
> > > + * This fixup function will be called to get the IO address of
> > isa/lpc
> > > + * devices when the normal of_translation failed.
> > > + *
> > > + * @parent: points to the parent dts node;
> > > + * @bus: points to the of_bus which can be used to parse
> > address;
> > > + * @addr: the address from reg property;
> > > + * @na: the address cell counter of @addr;
> > > + * @presult: store the address paresed from @addr;
> > > + *
> > > + * return 1 when successfully get the I/O address;
> > > + * 0 will return for some failures.
> >
> > Bah, you are returning a signed int, why 0 for failure? Return a
> > negative value with
> > error codes. Otherwise change the return value into a bool.
>
> Yes we'll move to bool
>
> >
> > > + */
> > > +static int of_get_isa_indirect_io(struct device_node *parent,
> > > + struct of_bus *bus, __be32 *addr,
> > > + int na, u64 *presult)
> > > +{
> > > + unsigned int flags;
> > > + unsigned int rlen;
> > > +
> > > + /* whether support indirectIO */
> > > + if (!indirect_io_enabled())
> > > + return 0;
> > > +
> > > + if (!of_bus_isa_match(parent))
> > > + return 0;
> > > +
> > > + flags = bus->get_flags(addr);
> > > + if (!(flags & IORESOURCE_IO))
> > > + return 0;
> > > +
> > > + /* there is ranges property, apply the normal translation
> > directly. */
> >
> > s/there is ranges/if we have a 'ranges'/
>
> Thanks for spotting this
>
> >
> > > + if (of_get_property(parent, "ranges", &rlen))
> > > + return 0;
> > > +
> > > + *presult = of_read_number(addr + 1, na - 1);
> > > + /* this fixup is only valid for specific I/O range. */
> > > + return addr_is_indirect_io(*presult);
> > > +}
> > > +
> > > static int of_translate_one(struct device_node *parent, struct
> > of_bus *bus,
> > > struct of_bus *pbus, __be32 *addr,
> > > int na, int ns, int pna, const char *rprop)
> > > @@ -595,6 +639,15 @@ static u64 __of_translate_address(struct
> > device_node *dev,
> > > result = of_read_number(addr, na);
> > > break;
> > > }
> > > + /*
> > > + * For indirectIO device which has no ranges property, get
> > > + * the address from reg directly.
> > > + */
> > > + if (of_get_isa_indirect_io(dev, bus, addr, na, &result)) {
> > > + pr_debug("isa indirectIO matched(%s)..addr =
> > 0x%llx\n",
> > > + of_node_full_name(dev), result);
> > > + break;
> > > + }
> > >
> > > /* Get new parent bus and counts */
> > > pbus = of_match_bus(parent);
> > > @@ -688,8 +741,9 @@ static int __of_address_to_resource(struct
> > device_node *dev,
> > > if (taddr == OF_BAD_ADDR)
> > > return -EINVAL;
> > > memset(r, 0, sizeof(struct resource));
> > > - if (flags & IORESOURCE_IO) {
> > > + if (flags & IORESOURCE_IO && taddr >= PCIBIOS_MIN_IO) {
> > > unsigned long port;
> > > +
> > > port = pci_address_to_pio(taddr);
> > > if (port == (unsigned long)-1)
> > > return -EINVAL;
> > > diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> > > index ba34907..1a08511 100644
> > > --- a/drivers/pci/pci.c
> > > +++ b/drivers/pci/pci.c
> > > @@ -3263,7 +3263,7 @@ int __weak pci_register_io_range(phys_addr_t
> > addr, resource_size_t size)
> > >
> > > #ifdef PCI_IOBASE
> > > struct io_range *range;
> > > - resource_size_t allocated_size = 0;
> > > + resource_size_t allocated_size = PCIBIOS_MIN_IO;
> > >
> > > /* check if the range hasn't been previously recorded */
> > > spin_lock(&io_range_lock);
> > > @@ -3312,7 +3312,7 @@ phys_addr_t pci_pio_to_address(unsigned long
> > pio)
> > >
> > > #ifdef PCI_IOBASE
> > > struct io_range *range;
> > > - resource_size_t allocated_size = 0;
> > > + resource_size_t allocated_size = PCIBIOS_MIN_IO;
> >
> > Have you checked that pci_pio_to_address still returns valid values
> > after this? I know that
> > you are trying to take into account PCIBIOS_MIN_IO limit when
> > allocating reserving the IO ranges,
> > but the values added in the io_range_list are still starting from zero,
> > no from PCIBIOS_MIN_IO,
>
> I think you're wrong here as in pci_address_to_pio we have:
> + resource_size_t offset = PCIBIOS_MIN_IO;
>
> This should be enough to guarantee that the PIOs start at
> PCIBIOS_MIN_IO...right?
I don't think you can guarantee that the pio value that gets passed into
pci_pio_to_address() always comes from a previously returned value by
pci_address_to_pio(). Maybe you can add a check in pci_pio_to_address()
if (pio < PCIBIOS_MIN_IO)
return address;
to avoid adding more checks in the list_for_each_entry() loop.
Best regards,
Liviu
>
>
> > so the calculation of the address in this function could return
> > negative values casted to pci_addr_t.
> >
> > Maybe you want to adjust the range->start value in
> > pci_register_io_range() as well to have it
> > offset by PCIBIOS_MIN_IO as well.
> >
> > Best regards,
> > Liviu
> >
> > >
> > > if (pio > IO_SPACE_LIMIT)
> > > return address;
> > > @@ -3335,7 +3335,7 @@ unsigned long __weak
> > pci_address_to_pio(phys_addr_t address)
> > > {
> > > #ifdef PCI_IOBASE
> > > struct io_range *res;
> > > - resource_size_t offset = 0;
> > > + resource_size_t offset = PCIBIOS_MIN_IO;
> > > unsigned long addr = -1;
> > >
> > > spin_lock(&io_range_lock);
> > > diff --git a/include/linux/of_address.h b/include/linux/of_address.h
> > > index 3786473..deec469 100644
> > > --- a/include/linux/of_address.h
> > > +++ b/include/linux/of_address.h
> > > @@ -24,6 +24,23 @@ struct of_pci_range {
> > > #define for_each_of_pci_range(parser, range) \
> > > for (; of_pci_range_parser_one(parser, range);)
> > >
> > > +
> > > +#ifndef indirect_io_enabled
> > > +#define indirect_io_enabled indirect_io_enabled
> > > +static inline bool indirect_io_enabled(void)
> > > +{
> > > + return false;
> > > +}
> > > +#endif
> > > +
> > > +#ifndef addr_is_indirect_io
> > > +#define addr_is_indirect_io addr_is_indirect_io
> > > +static inline int addr_is_indirect_io(u64 taddr)
> > > +{
> > > + return 0;
> > > +}
> > > +#endif
> > > +
> > > /* Translate a DMA address from device space to CPU space */
> > > extern u64 of_translate_dma_address(struct device_node *dev,
> > > const __be32 *in_addr);
> > > diff --git a/include/linux/pci.h b/include/linux/pci.h
> > > index 0e49f70..7f6bbb6 100644
> > > --- a/include/linux/pci.h
> > > +++ b/include/linux/pci.h
> > > @@ -2130,4 +2130,12 @@ static inline bool pci_ari_enabled(struct
> > pci_bus *bus)
> > > /* provide the legacy pci_dma_* API */
> > > #include <linux/pci-dma-compat.h>
> > >
> > > +/*
> > > + * define this macro here to refrain from compilation error for some
> > > + * platforms. Please keep this macro at the end of this header file.
> > > + */
> > > +#ifndef PCIBIOS_MIN_IO
> > > +#define PCIBIOS_MIN_IO 0
> > > +#endif
> > > +
> > > #endif /* LINUX_PCI_H */
> > > --
> > > 1.9.1
> > >
> > > --
> > > To unsubscribe from this list: send the line "unsubscribe linux-pci"
> > in
> > > the body of a message to majordomo@vger.kernel.org
> > > More majordomo info at http://vger.kernel.org/majordomo-info.html
--
====================
| I would like to |
| fix the world, |
| but they're not |
| giving me the |
\ source code! /
---------------
¯\_(ツ)_/¯
next prev parent reply other threads:[~2016-11-09 16:50 UTC|newest]
Thread overview: 83+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-08 3:47 [PATCH V5 0/3] ARM64 LPC: legacy ISA I/O support zhichang.yuan
2016-11-08 3:47 ` [PATCH V5 1/3] ARM64 LPC: Indirect ISA port IO introduced zhichang.yuan
2016-11-08 12:03 ` Mark Rutland
2016-11-08 16:09 ` Arnd Bergmann
2016-11-08 16:15 ` Arnd Bergmann
2016-11-08 23:16 ` Benjamin Herrenschmidt
2016-11-10 8:33 ` zhichang.yuan
2016-11-10 11:22 ` Mark Rutland
2016-11-10 19:32 ` Benjamin Herrenschmidt
2016-11-11 10:07 ` zhichang.yuan
2016-11-18 9:20 ` Arnd Bergmann
2016-11-18 11:12 ` zhichang.yuan
2016-11-18 11:38 ` Arnd Bergmann
2016-11-21 12:58 ` John Garry
2016-11-08 16:12 ` Will Deacon
2016-11-08 16:33 ` John Garry
2016-11-08 16:49 ` Will Deacon
2016-11-08 17:05 ` John Garry
2016-11-08 22:35 ` Arnd Bergmann
2016-11-09 11:29 ` John Garry
2016-11-09 21:33 ` Arnd Bergmann
2016-12-22 8:15 ` Ming Lei
2016-12-23 1:43 ` zhichang.yuan
2016-12-23 7:24 ` Ming Lei
2017-01-06 11:43 ` Arnd Bergmann
2016-11-08 3:47 ` [PATCH V5 2/3] ARM64 LPC: Add missing range exception for special ISA zhichang.yuan
2016-11-08 5:17 ` kbuild test robot
2016-11-08 5:27 ` kbuild test robot
2016-11-08 11:49 ` Mark Rutland
2016-11-08 16:19 ` Arnd Bergmann
2016-11-08 17:10 ` Mark Rutland
2016-11-09 13:54 ` One Thousand Gnomes
2016-11-09 14:51 ` Gabriele Paoloni
2016-11-09 21:38 ` Arnd Bergmann
2016-11-14 11:11 ` One Thousand Gnomes
2016-11-18 9:22 ` Arnd Bergmann
2016-11-08 23:12 ` Benjamin Herrenschmidt
2016-11-09 11:20 ` Mark Rutland
2016-11-10 7:08 ` Benjamin Herrenschmidt
2016-11-09 11:39 ` liviu.dudau
2016-11-09 16:16 ` Gabriele Paoloni
2016-11-09 16:50 ` liviu.dudau [this message]
2016-11-10 6:24 ` zhichang.yuan
2016-11-10 16:06 ` Gabriele Paoloni
2016-11-11 10:37 ` liviu.dudau
2016-11-08 3:47 ` [PATCH V5 3/3] ARM64 LPC: LPC driver implementation on Hip06 zhichang.yuan
2016-11-08 6:11 ` kbuild test robot
2016-11-08 16:24 ` Arnd Bergmann
2016-11-09 12:10 ` Gabriele Paoloni
2016-11-09 21:34 ` Arnd Bergmann
2016-11-10 6:40 ` zhichang.yuan
2016-11-10 9:12 ` Arnd Bergmann
2016-11-10 12:36 ` zhichang.yuan
2016-11-18 11:46 ` Arnd Bergmann
2016-11-10 15:36 ` Gabriele Paoloni
2016-11-10 16:07 ` Arnd Bergmann
2016-11-11 10:09 ` zhichang.yuan
2016-11-11 10:48 ` liviu.dudau
2016-11-11 13:39 ` Gabriele Paoloni
2016-11-11 14:45 ` liviu.dudau
2016-11-11 15:53 ` Gabriele Paoloni
2016-11-11 18:16 ` liviu.dudau
2016-11-14 8:26 ` Gabriele Paoloni
2016-11-14 11:26 ` liviu.dudau
2016-11-18 10:17 ` Arnd Bergmann
2016-11-18 12:07 ` Gabriele Paoloni
2016-11-18 12:24 ` Arnd Bergmann
2016-11-18 12:53 ` Gabriele Paoloni
2016-11-18 13:42 ` Arnd Bergmann
2016-11-18 16:18 ` Gabriele Paoloni
2016-11-18 16:34 ` Arnd Bergmann
2016-11-18 17:03 ` Gabriele Paoloni
2016-11-23 14:16 ` Arnd Bergmann
2016-11-23 15:22 ` Gabriele Paoloni
2016-11-23 17:07 ` Arnd Bergmann
2016-11-23 23:23 ` Arnd Bergmann
2016-11-24 9:12 ` zhichang.yuan
2016-11-24 10:24 ` Arnd Bergmann
2016-11-25 8:46 ` Gabriele Paoloni
2016-11-25 12:03 ` Arnd Bergmann
2016-11-25 16:27 ` Gabriele Paoloni
2016-11-11 16:54 ` zhichang.yuan
2016-11-14 11:06 ` One Thousand Gnomes
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20161109165044.GE10219@e106497-lin.cambridge.arm.com \
--to=liviu.dudau@arm.com \
--cc=arnd@arndb.de \
--cc=benh@kernel.crashing.org \
--cc=bhelgaas@google.com \
--cc=catalin.marinas@arm.com \
--cc=devicetree@vger.kernel.org \
--cc=gabriele.paoloni@huawei.com \
--cc=john.garry@huawei.com \
--cc=kantyzc@163.com \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pci@vger.kernel.org \
--cc=linux-serial@vger.kernel.org \
--cc=linuxarm@huawei.com \
--cc=lorenzo.pieralisi@arm.com \
--cc=mark.rutland@arm.com \
--cc=minyard@acm.org \
--cc=olof@lixom.net \
--cc=robh+dt@kernel.org \
--cc=will.deacon@arm.com \
--cc=xuwei5@hisilicon.com \
--cc=yuanzhichang@hisilicon.com \
--cc=zhichang.yuan02@gmail.com \
--cc=zourongrong@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).