linux-kernel - Re: [PATCH V9 4/6] PCI: Add ranges property for pci endpoint

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Message-ID: <836d998d-25db-7118-a08c-1b69f95254e1@amd.com>
Date:   Tue, 20 Jun 2023 15:57:37 -0700
From:   Lizhi Hou <lizhi.hou@....com>
To:     Rob Herring <robh@...nel.org>
CC:     <linux-pci@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <max.zhen@....com>,
        <sonal.santan@....com>, <stefano.stabellini@...inx.com>
Subject: Re: [PATCH V9 4/6] PCI: Add ranges property for pci endpoint


On 6/20/23 15:00, Rob Herring wrote:
> On Thu, Jun 15, 2023 at 09:50:40AM -0700, Lizhi Hou wrote:
>> For PCI endpoint defined quirks to generate device tree node, it requires
>> 'ranges' property to translate iomem addresses for its downstream devices.
> I'm not following why this patch is separate from patch 2 nor how patch
> 3 would function without it.
Ok. I will merge this with patch 2.
>
>> Signed-off-by: Lizhi Hou <lizhi.hou@....com>
>> ---
>>   drivers/pci/of_property.c | 33 ++++++++++++++++++++++-----------
>>   drivers/pci/quirks.c      |  1 +
>>   2 files changed, 23 insertions(+), 11 deletions(-)
>>
>> diff --git a/drivers/pci/of_property.c b/drivers/pci/of_property.c
>> index bdd756c8d7de..08654740f314 100644
>> --- a/drivers/pci/of_property.c
>> +++ b/drivers/pci/of_property.c
>> @@ -84,15 +84,22 @@ static int of_pci_prop_ranges(struct pci_dev *pdev, struct of_changeset *ocs,
>>   	struct of_pci_range *rp;
>>   	struct resource *res;
>>   	int i = 0, j, ret;
>> +	u32 flags, num;
>>   	u64 val64;
>> -	u32 flags;
>>   
>> -	rp = kcalloc(PCI_BRIDGE_RESOURCE_NUM, sizeof(*rp), GFP_KERNEL);
>> +	if (pci_is_bridge(pdev)) {
>> +		num = PCI_BRIDGE_RESOURCE_NUM;
>> +		res = &pdev->resource[PCI_BRIDGE_RESOURCES];
>> +	} else {
>> +		num = PCI_STD_NUM_BARS;
>> +		res = &pdev->resource[PCI_STD_RESOURCES];
>> +	}
>> +
>> +	rp = kcalloc(num, sizeof(*rp), GFP_KERNEL);
>>   	if (!rp)
>>   		return -ENOMEM;
>>   
>> -	res = &pdev->resource[PCI_BRIDGE_RESOURCES];
>> -	for (j = 0; j < PCI_BRIDGE_RESOURCE_NUM; j++) {
>> +	for (j = 0; j < num; j++) {
>>   		if (!resource_size(&res[j]))
>>   			continue;
>>   
>> @@ -102,8 +109,12 @@ static int of_pci_prop_ranges(struct pci_dev *pdev, struct of_changeset *ocs,
>>   		val64 = res[j].start;
>>   		of_pci_set_address(pdev, rp[i].parent_addr, val64, 0, flags,
>>   				   false);
>> -		memcpy(rp[i].child_addr, rp[i].parent_addr,
>> -		       sizeof(rp[i].child_addr));
>> +		if (pci_is_bridge(pdev)) {
>> +			memcpy(rp[i].child_addr, rp[i].parent_addr,
>> +			       sizeof(rp[i].child_addr));
>> +		} else {
>> +			rp[i].child_addr[0] = j;
> A comment that child address lower 64-bits is always 0x0 would be
> helpful here.

Sure, I will add a comment.


Thanks,

Lizhi

>
>> +		}
>>   
>>   		val64 = resource_size(&res[j]);
>>   		rp[i].size[0] = upper_32_bits(val64);
>> @@ -161,13 +172,13 @@ int of_pci_add_properties(struct pci_dev *pdev, struct of_changeset *ocs,
>>   	if (pci_is_bridge(pdev)) {
>>   		ret |= of_changeset_add_prop_string(ocs, np, "device_type",
>>   						    "pci");
>> -		ret |= of_changeset_add_prop_u32(ocs, np, "#address-cells",
>> -						 OF_PCI_ADDRESS_CELLS);
>> -		ret |= of_changeset_add_prop_u32(ocs, np, "#size-cells",
>> -						 OF_PCI_SIZE_CELLS);
>> -		ret |= of_pci_prop_ranges(pdev, ocs, np);
>>   	}
>>   
>> +	ret |= of_pci_prop_ranges(pdev, ocs, np);
>> +	ret |= of_changeset_add_prop_u32(ocs, np, "#address-cells",
>> +					 OF_PCI_ADDRESS_CELLS);
>> +	ret |= of_changeset_add_prop_u32(ocs, np, "#size-cells",
>> +					 OF_PCI_SIZE_CELLS);
>>   	ret |= of_pci_prop_reg(pdev, ocs, np);
>>   	ret |= of_pci_prop_compatible(pdev, ocs, np);
>>   
>> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
>> index c8f3acea752d..51945b631628 100644
>> --- a/drivers/pci/quirks.c
>> +++ b/drivers/pci/quirks.c
>> @@ -6052,3 +6052,4 @@ DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x9a31, dpc_log_size);
>>    */
>>   DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_XILINX, 0x5020, of_pci_make_dev_node);
>>   DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_XILINX, 0x5021, of_pci_make_dev_node);
>> +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_REDHAT, 0x0005, of_pci_make_dev_node);
>> -- 
>> 2.34.1
>>