Message-ID: <50ee7c83-7dd2-44b7-ad80-649db9a76077@siemens.com>
Date: Thu, 5 Sep 2024 09:15:55 +0200
From: Jan Kiszka <jan.kiszka@...mens.com>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: Nishanth Menon <nm@...com>, Santosh Shilimkar <ssantosh@...nel.org>,
 Vignesh Raghavendra <vigneshr@...com>, Tero Kristo <kristo@...nel.org>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-pci@...r.kernel.org, Siddharth Vadapalli <s-vadapalli@...com>,
 Bao Cheng Su <baocheng.su@...mens.com>, Hua Qian Li
 <huaqian.li@...mens.com>, Diogo Ivo <diogo.ivo@...mens.com>,
 Lorenzo Pieralisi <lpieralisi@...nel.org>,
 Krzysztof Wilczyński <kw@...ux.com>,
 Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH v4 2/7] dt-bindings: PCI: ti,am65: Extend for use with PVU

On 05.09.24 08:53, Krzysztof Kozlowski wrote:
> On 05/09/2024 08:40, Jan Kiszka wrote:
>> On 05.09.24 08:32, Krzysztof Kozlowski wrote:
>>> On Wed, Sep 04, 2024 at 12:00:11PM +0200, Jan Kiszka wrote:
>>>> From: Jan Kiszka <jan.kiszka@...mens.com>
>>>>
>>>> The PVU on the AM65 SoC is capable of restricting DMA from PCIe devices
>>>> to specific regions of host memory. Add the optional property
>>>> "memory-regions" to point to such regions of memory when PVU is used.
>>>>
>>>> Since the PVU deals with system physical addresses, utilizing the PVU
>>>> with PCIe devices also requires setting up the VMAP registers to map the
>>>> Requester ID of the PCIe device to the CBA Virtual ID, which in turn is
>>>> mapped to the system physical address. Hence, describe the VMAP
>>>> registers which are optionally unless the PVU shall used for PCIe.
>>>>
>>>> Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
>>>> ---
>>>> CC: Lorenzo Pieralisi <lpieralisi@...nel.org>
>>>> CC: "Krzysztof Wilczyński" <kw@...ux.com>
>>>> CC: Bjorn Helgaas <bhelgaas@...gle.com>
>>>> CC: linux-pci@...r.kernel.org
>>>> ---
>>>>  .../bindings/pci/ti,am65-pci-host.yaml        | 52 ++++++++++++++-----
>>>>  1 file changed, 40 insertions(+), 12 deletions(-)
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/pci/ti,am65-pci-host.yaml b/Documentation/devicetree/bindings/pci/ti,am65-pci-host.yaml
>>>> index 0a9d10532cc8..d8182bad92de 100644
>>>> --- a/Documentation/devicetree/bindings/pci/ti,am65-pci-host.yaml
>>>> +++ b/Documentation/devicetree/bindings/pci/ti,am65-pci-host.yaml
>>>> @@ -19,16 +19,6 @@ properties:
>>>>        - ti,am654-pcie-rc
>>>>        - ti,keystone-pcie
>>>>  
>>>> -  reg:
>>>> -    maxItems: 4
>>>> -
>>>> -  reg-names:
>>>> -    items:
>>>> -      - const: app
>>>> -      - const: dbics
>>>> -      - const: config
>>>> -      - const: atu
>>>
>>>
>>> Nothing improved here.
>>
>> Yes, explained the background to you. Sorry, if you do not address my
>> replies, I'm lost with your feedback.
> 
> My magic ball could not figure out the problem, so did not provide the
> answer.
> 
> I gave you the exact code which illustrates how to do it. If you do it
> that way: it works. If you do it other way: it might not work. However

The link you provided was unfortunately not self-explanatory because if 
I - apparently - do it like that example, I'm getting the errors below.

> without seeing anything, magic ball was silent, so I am not
> participating in game: would you be so kind to give more information so
> I won't waste my day in asking what is wrong.

With my patch:

# make ... dtbs_check
  DTC [C] arch/arm64/boot/dts/ti/k3-am6528-iot2050-basic.dtb
  DTC [C] arch/arm64/boot/dts/ti/k3-am6528-iot2050-basic-pg2.dtb
  DTC [C] arch/arm64/boot/dts/ti/k3-am6548-iot2050-advanced.dtb
  DTC [C] arch/arm64/boot/dts/ti/k3-am6548-iot2050-advanced-m2.dtb
  OVL [C] arch/arm64/boot/dts/ti/k3-am6548-iot2050-advanced-m2-bkey-ekey-pcie.dtb
  OVL [C] arch/arm64/boot/dts/ti/k3-am6548-iot2050-advanced-m2-bkey-usb3.dtb
  DTC [C] arch/arm64/boot/dts/ti/k3-am6548-iot2050-advanced-pg2.dtb
  DTC [C] arch/arm64/boot/dts/ti/k3-am6548-iot2050-advanced-sm.dtb
  DTC [C] arch/arm64/boot/dts/ti/k3-am654-base-board.dtb

With this revert on top:

diff --git a/Documentation/devicetree/bindings/pci/ti,am65-pci-host.yaml b/Documentation/devicetree/bindings/pci/ti,am65-pci-host.yaml
index d8182bad92de..dd753dae24c6 100644
--- a/Documentation/devicetree/bindings/pci/ti,am65-pci-host.yaml
+++ b/Documentation/devicetree/bindings/pci/ti,am65-pci-host.yaml
@@ -19,6 +19,16 @@ properties:
       - ti,am654-pcie-rc
       - ti,keystone-pcie
 
+  reg:
+    maxItems: 4
+
+  reg-names:
+    items:
+      - const: app
+      - const: dbics
+      - const: config
+      - const: atu
+
   interrupts:
     maxItems: 1
 
@@ -104,18 +114,6 @@ then:
     - msi-map
     - num-viewport
 
-else:
-  properties:
-    reg:
-      maxItems: 4
-
-    reg-names:
-      items:
-        - const: app
-        - const: dbics
-        - const: config
-        - const: atu
-
 unevaluatedProperties: false
 
 examples:

# make ... dtbs_check
  DTC [C] arch/arm64/boot/dts/ti/k3-am6528-iot2050-basic.dtb
.../arch/arm64/boot/dts/ti/k3-am6528-iot2050-basic.dtb: pcie@...0000: reg: [[0, 89128960, 0, 4096], [0, 89133056, 0, 4096], [0, 268435456, 0, 8192], [0, 89153536, 0, 4096], [0, 42991616, 0, 4096], [0, 43024384, 0, 4096]] is too long
        from schema $id: http://devicetree.org/schemas/pci/ti,am65-pci-host.yaml#
.../arch/arm64/boot/dts/ti/k3-am6528-iot2050-basic.dtb: pcie@...0000: reg-names: ['app', 'dbics', 'config', 'atu', 'vmap_lp', 'vmap_hp'] is too long
        from schema $id: http://devicetree.org/schemas/pci/ti,am65-pci-host.yaml#
.../arch/arm64/boot/dts/ti/k3-am6528-iot2050-basic.dtb: pcie@...0000: reg: [[0, 90177536, 0, 4096], [0, 90181632, 0, 4096], [0, 402653184, 0, 8192], [0, 90202112, 0, 4096], [0, 43057152, 0, 4096], [0, 43089920, 0, 4096]] is too long
        from schema $id: http://devicetree.org/schemas/pci/ti,am65-pci-host.yaml#
.../arch/arm64/boot/dts/ti/k3-am6528-iot2050-basic.dtb: pcie@...0000: reg-names: ['app', 'dbics', 'config', 'atu', 'vmap_lp', 'vmap_hp'] is too long
        from schema $id: http://devicetree.org/schemas/pci/ti,am65-pci-host.yaml#
  DTC [C] arch/arm64/boot/dts/ti/k3-am6528-iot2050-basic-pg2.dtb
...


Which magic dtschema spell am I missing to make this work like you 
suggest?

Jan

-- 
Siemens AG, Technology
Linux Expert Center

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