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Thu, 31 Jul 2025 05:49:19 -0700 (PDT) From: Jerome Brunet Date: Thu, 31 Jul 2025 14:49:01 +0200 Subject: [PATCH] Documentation: PCI: endpoint: document BAR assignment Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250731-vntb-doc-v1-1-95a0e0cd28d0@baylibre.com> X-B4-Tracking: v=1; b=H4sIADxmi2gC/6tWKk4tykwtVrJSqFYqSi3LLM7MzwNyDHUUlJIzE vPSU3UzU4B8JSMDI1MDc2ND3bK8kiTdlPxk3eSU1MTEpDQzw1QLEyWg8oKi1LTMCrBR0bG1tQD x83rpWgAAAA== X-Change-ID: 20250731-vntb-doc-cdeaabf61e84 To: Manivannan Sadhasivam , =?utf-8?q?Krzysztof_Wilczy=C5=84ski?= , Kishon Vijay Abraham I , Bjorn Helgaas , Jonathan Corbet Cc: Frank Li , linux-pci@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Bjorn Helgaas , Jerome Brunet X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=1863; i=jbrunet@baylibre.com; h=from:subject:message-id; bh=mkVOj2NTyAxnVS5zp9jHmusEh4Rd9O9gQokE52ch1aQ=; b=owEBbQKS/ZANAwAKAeb8Dxw38tqFAcsmYgBoi2ZLWZsA+zFwQXX+0XvAuP8szM4lJiXZoW2NQ zWY0y6HNwSJAjMEAAEKAB0WIQT04VmuGPP1bV8btxvm/A8cN/LahQUCaItmSwAKCRDm/A8cN/La hZTWD/95gKRIYfDY7sLoWcKrl4/uzvnfPfhoznwDtIsDVj+Nhd6x6YFiS8jRwOZUmM2x8FLBobw /xTSk9jI1eShAtn/pWBe/7eTzyNysVBuvZdkLYFiPasHr2gzuIpXuNdJzFZJxt4cqQPlmtAcmEm bbeaS15x//hNbGxBQaFM//HAcDLBqQhsVq+RdIJ5IYbvwq6gs5J0U894J0f8zqqbGBDumex3d+K ySeztabQKF58mL7Cjdx56edW1uhz3uWX+jBd4D/7VeCNm/Ljfm9evE3k46Ydyt5Grg6KavMXk2a gUnIZ9/oNxAkg+VWLetopjqunZqYqGV6xkVxAkzhMoWnKrqXZ/01/Ug2qftZHc1MrI0/pMOhiwC YFF68QYeWO0hnpwlrKAb/ZSgMU7pHOcBMm0hTrQ4b2/0Zm/lkAHXZaX/A6b4skPZlSPXVgCvth+ uE0XJc8Rj4+4kEXYRLZGNREewFKQeudakaZ4Ov9IHgtAHi8ASQDbt5ghQj9wamDGwmOP9ozV02b nUCa1/D8vwqn2/W009XDS+M2m+U5oWCl7xRuUfvhoL/0OSRlxx/B3gR7wlWKjOgzFiA76nflxkw FTydrfWNRwNbtMHoeYTMrX1n7SuV9ESaiarTFyFlo4mc+fM04O6CeFLSPnGdBNJbSEvPhd7TtK3 PmFCY6lTg/EbJWQ== X-Developer-Key: i=jbrunet@baylibre.com; a=openpgp; fpr=F29F26CF27BAE1A9719AE6BDC3C92AAF3E60AED9 It is now possible to assign BARs while creating a vNTB endpoint function. Update the documentation accordingly. Suggested-by: Bjorn Helgaas Signed-off-by: Jerome Brunet --- Documentation/PCI/endpoint/pci-vntb-howto.rst | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/Documentation/PCI/endpoint/pci-vntb-howto.rst b/Documentation/= PCI/endpoint/pci-vntb-howto.rst index 70d3bc90893f3315a7dff394d57e45c8378e2a54..9a7a2f0a68498e8b4297f242619= 54558d45c43a9 100644 --- a/Documentation/PCI/endpoint/pci-vntb-howto.rst +++ b/Documentation/PCI/endpoint/pci-vntb-howto.rst @@ -90,8 +90,9 @@ of the function device and is populated with the followin= g NTB specific attributes that can be configured by the user:: =20 # ls functions/pci_epf_vntb/func1/pci_epf_vntb.0/ - db_count mw1 mw2 mw3 mw4 num_mws - spad_count + ctrl_bar db_count mw1_bar mw2_bar mw3_bar mw4_bar spad_count + db_bar mw1 mw2 mw3 mw4 num_mws vbus_number + vntb_vid vntb_pid =20 A sample configuration for NTB function is given below:: =20 @@ -100,6 +101,10 @@ A sample configuration for NTB function is given below= :: # echo 1 > functions/pci_epf_vntb/func1/pci_epf_vntb.0/num_mws # echo 0x100000 > functions/pci_epf_vntb/func1/pci_epf_vntb.0/mw1 =20 +By default, each construct is assigned a BAR, as needed and in order. +Should a specific BAR setup be required by the platform, BAR may be assign= ed +to each construct using the related ``XYZ_bar`` entry. + A sample configuration for virtual NTB driver for virtual PCI bus:: =20 # echo 0x1957 > functions/pci_epf_vntb/func1/pci_epf_vntb.0/vntb_vid --- base-commit: e046b1731006b4c6c94bcb4ef1c6692a30014c43 change-id: 20250731-vntb-doc-cdeaabf61e84 Best regards, --=20 Jerome