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Sun, 22 Feb 2026 11:35:38 -0800 From: Manikanta Maddireddy To: , , , , , , , , , , , , , , , , , , <18255117159@163.com> CC: , , , Manikanta Maddireddy Subject: [PATCH 3/4] PCI: tegra194: Expose BAR2 (MSI-X) and BAR4 (DMA) as 64-bit BAR_RESERVED Date: Mon, 23 Feb 2026 01:04:55 +0530 Message-ID: <20260222193456.2460963-4-mmaddireddy@nvidia.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260222193456.2460963-1-mmaddireddy@nvidia.com> References: <20260222193456.2460963-1-mmaddireddy@nvidia.com> Precedence: bulk X-Mailing-List: linux-tegra@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-NVConfidentiality: public Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: rnnvmail203.nvidia.com (10.129.68.9) To rnnvmail201.nvidia.com (10.129.68.8) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH2PEPF00000148:EE_|DM4PR12MB5940:EE_ X-MS-Office365-Filtering-Correlation-Id: 40f81da1-5bd4-42a5-5dcb-08de7249981b X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|82310400026|36860700013|7416014|376014|921020; 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This keeps CONSECUTIVE_BAR_TEST working while allowing the host to use 64-bit BAR2 (MSI-X) and BAR4 (DMA). Signed-off-by: Manikanta Maddireddy --- drivers/pci/controller/dwc/pcie-tegra194.c | 38 +++++++++++++++++++--- 1 file changed, 33 insertions(+), 5 deletions(-) diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c index 3c84a230dc79..b5397a63461f 100644 --- a/drivers/pci/controller/dwc/pcie-tegra194.c +++ b/drivers/pci/controller/dwc/pcie-tegra194.c @@ -2000,16 +2000,44 @@ static int tegra_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no, return 0; } -/* Tegra EP: BAR0 = 64-bit programmable BAR */ +static const struct pci_epc_bar_rsvd_region tegra194_bar2_rsvd[] = { + { + /* MSI-X structure */ + .type = PCI_EPC_BAR_RSVD_MSIX_CTRL_RAM, + .offset = 0x0, + .size = SZ_128K, + }, +}; + +static const struct pci_epc_bar_rsvd_region tegra194_bar4_rsvd[] = { + { + /* DMA_CAP (BAR4: DMA Port Logic Structure) */ + .type = PCI_EPC_BAR_RSVD_DMA_CTRL_MMIO, + .offset = 0x0, + .size = SZ_4K, + }, +}; + +/* Tegra EP: BAR0 = 64-bit programmable BAR, BAR2 = 64-bit MSI-X table, BAR4 = 64-bit DMA regs. */ static const struct pci_epc_features tegra_pcie_epc_features = { .linkup_notifier = true, .msi_capable = true, .bar[BAR_0] = { .type = BAR_PROGRAMMABLE, .only_64bit = true, }, .bar[BAR_1] = { .type = BAR_64BIT_UPPER, }, - .bar[BAR_2] = { .type = BAR_DISABLED, }, - .bar[BAR_3] = { .type = BAR_DISABLED, }, - .bar[BAR_4] = { .type = BAR_DISABLED, }, - .bar[BAR_5] = { .type = BAR_DISABLED, }, + .bar[BAR_2] = { + .type = BAR_RESERVED, + .only_64bit = true, + .nr_rsvd_regions = ARRAY_SIZE(tegra194_bar2_rsvd), + .rsvd_regions = tegra194_bar2_rsvd, + }, + .bar[BAR_3] = { .type = BAR_64BIT_UPPER, }, + .bar[BAR_4] = { + .type = BAR_RESERVED, + .only_64bit = true, + .nr_rsvd_regions = ARRAY_SIZE(tegra194_bar4_rsvd), + .rsvd_regions = tegra194_bar4_rsvd, + }, + .bar[BAR_5] = { .type = BAR_64BIT_UPPER, }, .align = SZ_64K, }; -- 2.34.1