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{
    "id": 2175221,
    "url": "http://patchwork.ozlabs.org/api/1.0/patches/2175221/?format=api",
    "project": {
        "id": 28,
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        "name": "Linux PCI development",
        "link_name": "linux-pci",
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    "msgid": "<20251217151609.3162665-35-den@valinux.co.jp>",
    "date": "2025-12-17T15:16:08",
    "name": "[RFC,v3,34/35] Documentation: PCI: endpoint: pci-epf-vntb: Update and add mwN_offset usage",
    "commit_ref": null,
    "pull_url": null,
    "state": "new",
    "archived": false,
    "hash": "2d56a1d7bba476347322fd9f98f09370982901f9",
    "submitter": {
        "id": 91573,
        "url": "http://patchwork.ozlabs.org/api/1.0/people/91573/?format=api",
        "name": "Koichiro Den",
        "email": "den@valinux.co.jp"
    },
    "delegate": null,
    "mbox": "http://patchwork.ozlabs.org/project/linux-pci/patch/20251217151609.3162665-35-den@valinux.co.jp/mbox/",
    "series": [
        {
            "id": 485709,
            "url": "http://patchwork.ozlabs.org/api/1.0/series/485709/?format=api",
            "date": "2025-12-17T15:15:53",
            "name": "NTB transport backed by endpoint DW eDMA",
            "version": 3,
            "mbox": "http://patchwork.ozlabs.org/series/485709/mbox/"
        }
    ],
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        "From": "Koichiro Den <den@valinux.co.jp>",
        "To": "Frank.Li@nxp.com,\n\tdave.jiang@intel.com,\n\tntb@lists.linux.dev,\n\tlinux-pci@vger.kernel.org,\n\tdmaengine@vger.kernel.org,\n\tlinux-renesas-soc@vger.kernel.org,\n\tnetdev@vger.kernel.org,\n\tlinux-kernel@vger.kernel.org",
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        "Subject": "[RFC PATCH v3 34/35] Documentation: PCI: endpoint: pci-epf-vntb:\n Update and add mwN_offset usage",
        "Date": "Thu, 18 Dec 2025 00:16:08 +0900",
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    },
    "content": "Add a concrete example showing how to place multiple memory windows in\nthe same BAR (one for data, one for interrupts) by using 'mwN_offset'\nand 'mwN_bar'.\n\nSigned-off-by: Koichiro Den <den@valinux.co.jp>\n---\n Documentation/PCI/endpoint/pci-vntb-howto.rst | 16 +++++++++++++---\n 1 file changed, 13 insertions(+), 3 deletions(-)",
    "diff": "diff --git a/Documentation/PCI/endpoint/pci-vntb-howto.rst b/Documentation/PCI/endpoint/pci-vntb-howto.rst\nindex 9a7a2f0a6849..bfc3e51ab79f 100644\n--- a/Documentation/PCI/endpoint/pci-vntb-howto.rst\n+++ b/Documentation/PCI/endpoint/pci-vntb-howto.rst\n@@ -90,9 +90,9 @@ of the function device and is populated with the following NTB specific\n attributes that can be configured by the user::\n \n \t# ls functions/pci_epf_vntb/func1/pci_epf_vntb.0/\n-\tctrl_bar  db_count  mw1_bar  mw2_bar  mw3_bar  mw4_bar\tspad_count\n-\tdb_bar\t  mw1\t    mw2      mw3      mw4      num_mws\tvbus_number\n-\tvntb_vid  vntb_pid\n+\tctrl_bar  mw1         mw2         mw3         mw4         num_mws      vntb_pid\n+\tdb_bar    mw1_bar     mw2_bar     mw3_bar     mw4_bar     spad_count   vntb_vid\n+\tdb_count  mw1_offset  mw2_offset  mw3_offset  mw4_offset  vbus_number\n \n A sample configuration for NTB function is given below::\n \n@@ -111,6 +111,16 @@ A sample configuration for virtual NTB driver for virtual PCI bus::\n \t# echo 0x080A > functions/pci_epf_vntb/func1/pci_epf_vntb.0/vntb_pid\n \t# echo 0x10 > functions/pci_epf_vntb/func1/pci_epf_vntb.0/vbus_number\n \n+When BAR resources are tight but you still need to create many memory\n+windows, you can pack multiple windows into a single BAR via 'mwN_offset'\n+and 'mwN_bar' as shown below::\n+\n+\t# echo 0xE0000 > functions/pci_epf_vntb/func1/pci_epf_vntb.0/mw1\n+\t# echo 0x20000 > functions/pci_epf_vntb/func1/pci_epf_vntb.0/mw2\n+\t# echo 0xE0000 > functions/pci_epf_vntb/func1/pci_epf_vntb.0/mw2_offset\n+\t# echo 2 > functions/pci_epf_vntb/func1/pci_epf_vntb.0/mw1_bar\n+\t# echo 2 > functions/pci_epf_vntb/func1/pci_epf_vntb.0/mw2_bar\n+\n Binding pci-epf-ntb Device to EP Controller\n --------------------------------------------\n \n",
    "prefixes": [
        "RFC",
        "v3",
        "34/35"
    ]
}