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Date: Fri, 23 Sep 2016 14:41:39 -0400
From: Christopher Covington <cov@...eaurora.org>
To: Bjorn Helgaas <helgaas@...nel.org>
Cc: Tomasz Nowicki <tn@...ihalf.com>, will.deacon@....com,
catalin.marinas@....com, rafael@...nel.org,
Lorenzo.Pieralisi@....com, arnd@...db.de, hanjun.guo@...aro.org,
okaya@...eaurora.org, jchandra@...adcom.com, dhdang@....com,
ard.biesheuvel@...aro.org, robert.richter@...iumnetworks.com,
mw@...ihalf.com, Liviu.Dudau@....com, ddaney@...iumnetworks.com,
wangyijing@...wei.com, msalter@...hat.com,
linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linaro-acpi@...ts.linaro.org, jcm@...hat.com,
andrea.gallo@...aro.org, jeremy.linton@....com,
liudongdong3@...wei.com, gabriele.paoloni@...wei.com,
jhugo@...eaurora.org, linux-acpi@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH V6 0/5] ECAM quirks handling for ARM64 platforms
On 09/22/2016 07:08 PM, Bjorn Helgaas wrote:
> On Wed, Sep 21, 2016 at 06:40:47PM -0400, Christopher Covington wrote:
>> Hi Bjorn,
>>
>> On 09/21/2016 09:11 AM, Bjorn Helgaas wrote:
>>> On Tue, Sep 20, 2016 at 09:15:14PM -0400, cov@...eaurora.org wrote:
>>
>>>>> diff --git a/drivers/acpi/pci_mcfg.c b/drivers/acpi/pci_mcfg.c
>>>>> index eb14f74..bb3b8ad 100644
>>>>> --- a/drivers/acpi/pci_mcfg.c
>>>>> +++ b/drivers/acpi/pci_mcfg.c
>>>>> @@ -42,86 +42,59 @@ struct mcfg_fixup {
>>>>> struct resource cfgres;
>>>>> };
>>>>>
>>>>> -#define MCFG_DOM_ANY (-1)
>>>>
>>>> Did you delete this because there were no current users, because you'd
>>>> prefer users just use "-1", or for some other reason?
>>>
>>> I removed it because there were no users of it and, more importantly,
>>> the code doesn't implement support for it.
>>
>> It looks like a stale "First match against PCI topology <domain:bus>..."
>> comment remains.
>
> Yep. I removed the comment since it's sort of obvious from the code.
> I also renamed a few things and pulled the match out into a helper
> function.
>
> I also changed the dmesg note: I think the actual resource and the
> name of the pci_ecam_ops is more interesting than the table IDs (which
> I think are already elsewhere in the dmesg log).
It looks like the resource is already being printed from
drivers/pci/ecam.c:102.
> Here's the incremental diff, which I can't really test:
Here's what it looks like for me:
ACPI: PCI Root Bridge [PCI2] (domain 0002 [bus 00-1f])
acpi PNP0A08:02: _OSC: OS supports [ExtendedConfig ASPM ClockPM Segments MSI]
acpi PNP0A08:02: _OSC: platform does not support [PCIeHotplug]
acpi PNP0A08:02: _OSC: OS now controls [PME AER PCIeCapability]
acpi PNP0A08:02: MCFG quirk: ECAM space for [bus 00-1f] at [mem 0xa0000000000-0xa0001ffffff] with pci_3
acpi PNP0A08:02: ECAM at [mem 0xa0000000000-0xa0001ffffff] for [bus 00-1f]
Remapped I/O 0x00000affffff0000 to [io 0x10000-0x1ffff window]
PCI host bridge to bus 0002:00
> diff --git a/drivers/acpi/pci_mcfg.c b/drivers/acpi/pci_mcfg.c
> index 245b79f..0b36bc5 100644
> --- a/drivers/acpi/pci_mcfg.c
> +++ b/drivers/acpi/pci_mcfg.c
> @@ -36,7 +36,7 @@ struct mcfg_fixup {
> char oem_id[ACPI_OEM_ID_SIZE + 1];
> char oem_table_id[ACPI_OEM_TABLE_ID_SIZE + 1];
> u32 oem_revision;
> - u16 seg;
> + u16 segment;
> struct resource bus_range;
> struct pci_ecam_ops *ops;
> struct resource cfgres;
> @@ -102,30 +102,37 @@ static char mcfg_oem_id[ACPI_OEM_ID_SIZE];
> static char mcfg_oem_table_id[ACPI_OEM_TABLE_ID_SIZE];
> static u32 mcfg_oem_revision;
>
> -static void pci_mcfg_match_quirks(struct acpi_pci_root *root,
> +static int pci_mcfg_quirk_matches(struct mcfg_fixup *f, u16 segment,
> + struct resource *bus_range)
> +{
> + if (!memcmp(f->oem_id, mcfg_oem_id, ACPI_OEM_ID_SIZE) &&
> + !memcmp(f->oem_table_id, mcfg_oem_table_id,
> + ACPI_OEM_TABLE_ID_SIZE) &&
> + f->oem_revision == mcfg_oem_revision &&
> + f->segment == segment &&
> + resource_contains(&f->bus_range, bus_range))
> + return 1;
> +
> + return 0;
> +}
> +
> +static void pci_mcfg_apply_quirks(struct acpi_pci_root *root,
> struct resource *cfgres,
> struct pci_ecam_ops **ecam_ops)
> {
> + u16 segment = root->segment;
> + struct resource *bus_range = &root->secondary;
> struct mcfg_fixup *f;
> int i;
>
> - /*
> - * First match against PCI topology <domain:bus> then use OEM ID, OEM
> - * table ID, and OEM revision from MCFG table standard header.
> - */
> for (i = 0, f = mcfg_quirks; i < ARRAY_SIZE(mcfg_quirks); i++, f++) {
> - if (!memcmp(f->oem_id, mcfg_oem_id, ACPI_OEM_ID_SIZE) &&
> - !memcmp(f->oem_table_id, mcfg_oem_table_id,
> - ACPI_OEM_TABLE_ID_SIZE) &&
> - f->oem_revision == mcfg_oem_revision &&
> - f->seg == root->segment &&
> - resource_contains(&f->bus_range, &root->secondary)) {
> + if (pci_mcfg_quirk_matches(f, segment, bus_range)) {
> if (f->cfgres.start)
> *cfgres = f->cfgres;
> if (f->ops)
> *ecam_ops = f->ops;
> - dev_info(&root->device->dev, "Applying PCI MCFG quirks for %s %s rev: %d\n",
> - f->oem_id, f->oem_table_id, f->oem_revision);
> + dev_info(&root->device->dev, "MCFG quirk: ECAM space for %pR at %pR with %ps\n",
> + bus_range, cfgres, *ecam_ops);
> return;
> }
> }
> @@ -173,7 +180,7 @@ skip_lookup:
> * MCFG does not have it. Invalid CFG start address means MCFG
> * firmware bug or we need another quirk in array.
> */
> - pci_mcfg_match_quirks(root, &res, &ops);
> + pci_mcfg_apply_quirks(root, &res, &ops);
> if (!res.start)
> return -ENXIO;
>
>
--
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