* [PATCH v3] PCI: loongson: Use DECLARE_PCI_FIXUP_EARLY for bridge_class_quirk()
@ 2020-07-16 2:19 Tiezhu Yang
2020-07-16 2:21 ` Huacai Chen
2020-07-17 10:28 ` Lorenzo Pieralisi
0 siblings, 2 replies; 4+ messages in thread
From: Tiezhu Yang @ 2020-07-16 2:19 UTC (permalink / raw)
To: Lorenzo Pieralisi, Rob Herring, Bjorn Helgaas,
Thomas Bogendoerfer, Huacai Chen, Jiaxun Yang
Cc: linux-mips, linux-pci, linux-kernel, Xuefeng Li
According to the datasheet of Loongson LS7A bridge chip, the old version
of Loongson LS7A PCIE port has a hardware bug about PCI class. As far as
I know, the latest version has already fixed this bug.
In order to maintain downward compatibility, use DECLARE_PCI_FIXUP_EARLY
instead of DECLARE_PCI_FIXUP_HEADER for bridge_class_quirk() to fix it as
early as possible.
Otherwise, in the function pci_setup_device(), the related code about
"dev->class" such as "class = dev->class >> 8;" and "dev->transparent
= ((dev->class & 0xff) == 1);" maybe get wrong value due to without
EARLY fixup.
By the way, we can see that the PCI class fixup of other controllers are
all EARLY fixups:
[root@linux linux.git]# grep -rn -A 3 "PCI_CLASS_BRIDGE_PCI << 8" drivers/pci/controller/ | grep EARLY
drivers/pci/controller/pcie-tango.c-327-DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_SIGMA, 0x0024, tango_fixup_class);
drivers/pci/controller/pcie-tango.c-328-DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_SIGMA, 0x0028, tango_fixup_class);
drivers/pci/controller/pci-tegra.c-775-DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0bf0, tegra_pcie_fixup_class);
drivers/pci/controller/pci-tegra.c-776-DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0bf1, tegra_pcie_fixup_class);
drivers/pci/controller/dwc/pcie-qcom.c-1442-DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_QCOM, 0x0101, qcom_fixup_class);
drivers/pci/controller/dwc/pcie-qcom.c-1443-DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_QCOM, 0x0104, qcom_fixup_class);
drivers/pci/controller/pcie-iproc-bcma.c-23-DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, 0x8011, bcma_pcie2_fixup_class);
drivers/pci/controller/pcie-iproc-bcma.c-24-DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, 0x8012, bcma_pcie2_fixup_class);
Fixes: 1f58cca5cf2b ("PCI: Add Loongson PCI Controller support")
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
---
v2: Modify the patch subject used with lower case "loongson"
v3: Update the commit message
drivers/pci/controller/pci-loongson.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/pci/controller/pci-loongson.c b/drivers/pci/controller/pci-loongson.c
index 459009c..58b862a 100644
--- a/drivers/pci/controller/pci-loongson.c
+++ b/drivers/pci/controller/pci-loongson.c
@@ -37,11 +37,11 @@ static void bridge_class_quirk(struct pci_dev *dev)
{
dev->class = PCI_CLASS_BRIDGE_PCI << 8;
}
-DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_LOONGSON,
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_LOONGSON,
DEV_PCIE_PORT_0, bridge_class_quirk);
-DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_LOONGSON,
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_LOONGSON,
DEV_PCIE_PORT_1, bridge_class_quirk);
-DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_LOONGSON,
+DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_LOONGSON,
DEV_PCIE_PORT_2, bridge_class_quirk);
static void system_bus_quirk(struct pci_dev *pdev)
--
2.1.0
^ permalink raw reply related [flat|nested] 4+ messages in thread* Re: [PATCH v3] PCI: loongson: Use DECLARE_PCI_FIXUP_EARLY for bridge_class_quirk()
2020-07-16 2:19 [PATCH v3] PCI: loongson: Use DECLARE_PCI_FIXUP_EARLY for bridge_class_quirk() Tiezhu Yang
@ 2020-07-16 2:21 ` Huacai Chen
2020-07-16 2:37 ` Tiezhu Yang
2020-07-17 10:28 ` Lorenzo Pieralisi
1 sibling, 1 reply; 4+ messages in thread
From: Huacai Chen @ 2020-07-16 2:21 UTC (permalink / raw)
To: Tiezhu Yang
Cc: Lorenzo Pieralisi, Rob Herring, Bjorn Helgaas,
Thomas Bogendoerfer, Jiaxun Yang, open list:MIPS, linux-pci,
LKML, Xuefeng Li
Hi, Tiezhu,
You don't need to use the lower case in the title, "Loongson" is just
fine (and is recommended).
On Thu, Jul 16, 2020 at 10:19 AM Tiezhu Yang <yangtiezhu@loongson.cn> wrote:
>
> According to the datasheet of Loongson LS7A bridge chip, the old version
> of Loongson LS7A PCIE port has a hardware bug about PCI class. As far as
> I know, the latest version has already fixed this bug.
>
> In order to maintain downward compatibility, use DECLARE_PCI_FIXUP_EARLY
> instead of DECLARE_PCI_FIXUP_HEADER for bridge_class_quirk() to fix it as
> early as possible.
>
> Otherwise, in the function pci_setup_device(), the related code about
> "dev->class" such as "class = dev->class >> 8;" and "dev->transparent
> = ((dev->class & 0xff) == 1);" maybe get wrong value due to without
> EARLY fixup.
>
> By the way, we can see that the PCI class fixup of other controllers are
> all EARLY fixups:
>
> [root@linux linux.git]# grep -rn -A 3 "PCI_CLASS_BRIDGE_PCI << 8" drivers/pci/controller/ | grep EARLY
> drivers/pci/controller/pcie-tango.c-327-DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_SIGMA, 0x0024, tango_fixup_class);
> drivers/pci/controller/pcie-tango.c-328-DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_SIGMA, 0x0028, tango_fixup_class);
> drivers/pci/controller/pci-tegra.c-775-DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0bf0, tegra_pcie_fixup_class);
> drivers/pci/controller/pci-tegra.c-776-DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0bf1, tegra_pcie_fixup_class);
> drivers/pci/controller/dwc/pcie-qcom.c-1442-DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_QCOM, 0x0101, qcom_fixup_class);
> drivers/pci/controller/dwc/pcie-qcom.c-1443-DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_QCOM, 0x0104, qcom_fixup_class);
> drivers/pci/controller/pcie-iproc-bcma.c-23-DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, 0x8011, bcma_pcie2_fixup_class);
> drivers/pci/controller/pcie-iproc-bcma.c-24-DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, 0x8012, bcma_pcie2_fixup_class);
>
> Fixes: 1f58cca5cf2b ("PCI: Add Loongson PCI Controller support")
> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
> ---
>
> v2: Modify the patch subject used with lower case "loongson"
>
> v3: Update the commit message
>
> drivers/pci/controller/pci-loongson.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/pci/controller/pci-loongson.c b/drivers/pci/controller/pci-loongson.c
> index 459009c..58b862a 100644
> --- a/drivers/pci/controller/pci-loongson.c
> +++ b/drivers/pci/controller/pci-loongson.c
> @@ -37,11 +37,11 @@ static void bridge_class_quirk(struct pci_dev *dev)
> {
> dev->class = PCI_CLASS_BRIDGE_PCI << 8;
> }
> -DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_LOONGSON,
> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_LOONGSON,
> DEV_PCIE_PORT_0, bridge_class_quirk);
> -DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_LOONGSON,
> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_LOONGSON,
> DEV_PCIE_PORT_1, bridge_class_quirk);
> -DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_LOONGSON,
> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_LOONGSON,
> DEV_PCIE_PORT_2, bridge_class_quirk);
>
> static void system_bus_quirk(struct pci_dev *pdev)
> --
> 2.1.0
>
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [PATCH v3] PCI: loongson: Use DECLARE_PCI_FIXUP_EARLY for bridge_class_quirk()
2020-07-16 2:21 ` Huacai Chen
@ 2020-07-16 2:37 ` Tiezhu Yang
0 siblings, 0 replies; 4+ messages in thread
From: Tiezhu Yang @ 2020-07-16 2:37 UTC (permalink / raw)
To: Huacai Chen
Cc: Lorenzo Pieralisi, Rob Herring, Bjorn Helgaas,
Thomas Bogendoerfer, Jiaxun Yang, open list:MIPS, linux-pci,
LKML, Xuefeng Li
On 07/16/2020 10:21 AM, Huacai Chen wrote:
> Hi, Tiezhu,
>
> You don't need to use the lower case in the title, "Loongson" is just
> fine (and is recommended).
Hi Huacai,
Thanks for your reply.
In the first version of this patch, I received the following reply by Bjorn:
[Subject line:
PCI: loongson: Use DECLARE_PCI_FIXUP_EARLY for bridge_class_quirk()
(Driver names are conventionally lower case.)
Lorenzo will probably silently fix this when applying, so this is
mostly just a reminder in case you need to revise this or for future
patches.]
https://lore.kernel.org/patchwork/patch/1254407/
I also checked the git log of drivers/pci/controller:
[yangtiezhu@linux linux.git]$ git log --oneline drivers/pci/controller |
grep "PCI:" | head
8d7e33d PCI: uniphier: Add Socionext UniPhier Pro5 PCIe endpoint
controller driver
fcee90c PCI: tegra: Fix runtime PM imbalance on error
3e5095e PCI: vmd: Filter resource type bits from shadow register
1c1dbb2 PCI: tegra194: Fix runtime PM imbalance on error
d0684fd0 PCI: hv: Use struct_size() helper
1f58cca PCI: Add Loongson PCI Controller support
03f8c1b3 PCI: dwc: Use private data pointer of "struct irq_domain" to
get pcie_port
87dccf0 PCI: amlogic: meson: Don't use FAST_LINK_MODE to set up link
0414b93 PCI: dwc: Fix inner MSI IRQ domain registration
c8a1197 PCI: dwc: pci-dra7xx: Use devm_platform_ioremap_resource_byname()
So use lower case "loongson" may be proper here.
Thanks,
Tiezhu
>
> On Thu, Jul 16, 2020 at 10:19 AM Tiezhu Yang <yangtiezhu@loongson.cn> wrote:
>> According to the datasheet of Loongson LS7A bridge chip, the old version
>> of Loongson LS7A PCIE port has a hardware bug about PCI class. As far as
>> I know, the latest version has already fixed this bug.
>>
>> In order to maintain downward compatibility, use DECLARE_PCI_FIXUP_EARLY
>> instead of DECLARE_PCI_FIXUP_HEADER for bridge_class_quirk() to fix it as
>> early as possible.
>>
>> Otherwise, in the function pci_setup_device(), the related code about
>> "dev->class" such as "class = dev->class >> 8;" and "dev->transparent
>> = ((dev->class & 0xff) == 1);" maybe get wrong value due to without
>> EARLY fixup.
>>
>> By the way, we can see that the PCI class fixup of other controllers are
>> all EARLY fixups:
>>
>> [root@linux linux.git]# grep -rn -A 3 "PCI_CLASS_BRIDGE_PCI << 8" drivers/pci/controller/ | grep EARLY
>> drivers/pci/controller/pcie-tango.c-327-DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_SIGMA, 0x0024, tango_fixup_class);
>> drivers/pci/controller/pcie-tango.c-328-DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_SIGMA, 0x0028, tango_fixup_class);
>> drivers/pci/controller/pci-tegra.c-775-DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0bf0, tegra_pcie_fixup_class);
>> drivers/pci/controller/pci-tegra.c-776-DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0bf1, tegra_pcie_fixup_class);
>> drivers/pci/controller/dwc/pcie-qcom.c-1442-DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_QCOM, 0x0101, qcom_fixup_class);
>> drivers/pci/controller/dwc/pcie-qcom.c-1443-DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_QCOM, 0x0104, qcom_fixup_class);
>> drivers/pci/controller/pcie-iproc-bcma.c-23-DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, 0x8011, bcma_pcie2_fixup_class);
>> drivers/pci/controller/pcie-iproc-bcma.c-24-DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, 0x8012, bcma_pcie2_fixup_class);
>>
>> Fixes: 1f58cca5cf2b ("PCI: Add Loongson PCI Controller support")
>> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
>> ---
>>
>> v2: Modify the patch subject used with lower case "loongson"
>>
>> v3: Update the commit message
>>
>> drivers/pci/controller/pci-loongson.c | 6 +++---
>> 1 file changed, 3 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/pci/controller/pci-loongson.c b/drivers/pci/controller/pci-loongson.c
>> index 459009c..58b862a 100644
>> --- a/drivers/pci/controller/pci-loongson.c
>> +++ b/drivers/pci/controller/pci-loongson.c
>> @@ -37,11 +37,11 @@ static void bridge_class_quirk(struct pci_dev *dev)
>> {
>> dev->class = PCI_CLASS_BRIDGE_PCI << 8;
>> }
>> -DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_LOONGSON,
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_LOONGSON,
>> DEV_PCIE_PORT_0, bridge_class_quirk);
>> -DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_LOONGSON,
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_LOONGSON,
>> DEV_PCIE_PORT_1, bridge_class_quirk);
>> -DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_LOONGSON,
>> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_LOONGSON,
>> DEV_PCIE_PORT_2, bridge_class_quirk);
>>
>> static void system_bus_quirk(struct pci_dev *pdev)
>> --
>> 2.1.0
>>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH v3] PCI: loongson: Use DECLARE_PCI_FIXUP_EARLY for bridge_class_quirk()
2020-07-16 2:19 [PATCH v3] PCI: loongson: Use DECLARE_PCI_FIXUP_EARLY for bridge_class_quirk() Tiezhu Yang
2020-07-16 2:21 ` Huacai Chen
@ 2020-07-17 10:28 ` Lorenzo Pieralisi
1 sibling, 0 replies; 4+ messages in thread
From: Lorenzo Pieralisi @ 2020-07-17 10:28 UTC (permalink / raw)
To: Tiezhu Yang
Cc: Rob Herring, Bjorn Helgaas, Thomas Bogendoerfer, Huacai Chen,
Jiaxun Yang, linux-mips, linux-pci, linux-kernel, Xuefeng Li
On Thu, Jul 16, 2020 at 10:19:06AM +0800, Tiezhu Yang wrote:
> According to the datasheet of Loongson LS7A bridge chip, the old version
> of Loongson LS7A PCIE port has a hardware bug about PCI class. As far as
> I know, the latest version has already fixed this bug.
Please define the bug and how are you fixing it, that's it.
> In order to maintain downward compatibility, use DECLARE_PCI_FIXUP_EARLY
> instead of DECLARE_PCI_FIXUP_HEADER for bridge_class_quirk() to fix it as
> early as possible.
>
> Otherwise, in the function pci_setup_device(), the related code about
> "dev->class" such as "class = dev->class >> 8;" and "dev->transparent
> = ((dev->class & 0xff) == 1);" maybe get wrong value due to without
> EARLY fixup.
>
> By the way, we can see that the PCI class fixup of other controllers are
> all EARLY fixups:
>
> [root@linux linux.git]# grep -rn -A 3 "PCI_CLASS_BRIDGE_PCI << 8" drivers/pci/controller/ | grep EARLY
> drivers/pci/controller/pcie-tango.c-327-DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_SIGMA, 0x0024, tango_fixup_class);
> drivers/pci/controller/pcie-tango.c-328-DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_SIGMA, 0x0028, tango_fixup_class);
> drivers/pci/controller/pci-tegra.c-775-DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0bf0, tegra_pcie_fixup_class);
> drivers/pci/controller/pci-tegra.c-776-DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0bf1, tegra_pcie_fixup_class);
> drivers/pci/controller/dwc/pcie-qcom.c-1442-DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_QCOM, 0x0101, qcom_fixup_class);
> drivers/pci/controller/dwc/pcie-qcom.c-1443-DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_QCOM, 0x0104, qcom_fixup_class);
> drivers/pci/controller/pcie-iproc-bcma.c-23-DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, 0x8011, bcma_pcie2_fixup_class);
> drivers/pci/controller/pcie-iproc-bcma.c-24-DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, 0x8012, bcma_pcie2_fixup_class);
This is irrelevant information, please remove it.
Thanks,
Lorenzo
> Fixes: 1f58cca5cf2b ("PCI: Add Loongson PCI Controller support")
> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
> ---
>
> v2: Modify the patch subject used with lower case "loongson"
>
> v3: Update the commit message
>
> drivers/pci/controller/pci-loongson.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/pci/controller/pci-loongson.c b/drivers/pci/controller/pci-loongson.c
> index 459009c..58b862a 100644
> --- a/drivers/pci/controller/pci-loongson.c
> +++ b/drivers/pci/controller/pci-loongson.c
> @@ -37,11 +37,11 @@ static void bridge_class_quirk(struct pci_dev *dev)
> {
> dev->class = PCI_CLASS_BRIDGE_PCI << 8;
> }
> -DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_LOONGSON,
> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_LOONGSON,
> DEV_PCIE_PORT_0, bridge_class_quirk);
> -DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_LOONGSON,
> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_LOONGSON,
> DEV_PCIE_PORT_1, bridge_class_quirk);
> -DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_LOONGSON,
> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_LOONGSON,
> DEV_PCIE_PORT_2, bridge_class_quirk);
>
> static void system_bus_quirk(struct pci_dev *pdev)
> --
> 2.1.0
>
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2020-07-17 10:28 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-07-16 2:19 [PATCH v3] PCI: loongson: Use DECLARE_PCI_FIXUP_EARLY for bridge_class_quirk() Tiezhu Yang
2020-07-16 2:21 ` Huacai Chen
2020-07-16 2:37 ` Tiezhu Yang
2020-07-17 10:28 ` Lorenzo Pieralisi
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