From: Niklas Cassel <cassel@kernel.org>
To: Manikanta Maddireddy <mmaddireddy@nvidia.com>
Cc: bhelgaas@google.com, lpieralisi@kernel.org,
kwilczynski@kernel.org, mani@kernel.org, robh@kernel.org,
krzk+dt@kernel.org, conor+dt@kernel.org,
thierry.reding@gmail.com, jonathanh@nvidia.com,
kishon@kernel.org, arnd@arndb.de, gregkh@linuxfoundation.org,
Frank.Li@nxp.com, den@valinux.co.jp, hongxing.zhu@nxp.com,
jingoohan1@gmail.com, vidyas@nvidia.com, 18255117159@163.com,
linux-pci@vger.kernel.org, linux-tegra@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 4/5] PCI: tegra194: Expose BAR2 (MSI-X) and BAR4 (DMA) as 64-bit BAR_RESERVED
Date: Tue, 3 Mar 2026 14:51:35 +0100 [thread overview]
Message-ID: <aabnZ2VpSI4GCXUi@ryzen> (raw)
In-Reply-To: <20260303072004.2384079-5-mmaddireddy@nvidia.com>
On Tue, Mar 03, 2026 at 12:50:03PM +0530, Manikanta Maddireddy wrote:
> Tegra Endpoint exposes three 64-bit BARs at indices 0, 2, and 4:
> - BAR0+BAR1: EPF test/data (programmable 64-bit BAR)
> - BAR2+BAR3: MSI-X table (hardware-backed)
> - BAR4+BAR5: DMA registers (hardware-backed)
>
> Update tegra_pcie_epc_features so that BAR2 is BAR_RESERVED with
> PCI_EPC_BAR_RSVD_MSIX_TBL_RAM (64 KB) & PCI_EPC_BAR_RSVD_MSIX_PBA_RAM (64 KB),
> BAR3 is BAR_64BIT_UPPER, BAR4 is BAR_RESERVED with
> PCI_EPC_BAR_RSVD_DMA_CTRL_MMIO (4KB), and BAR5 is BAR_64BIT_UPPER.
> 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 <mmaddireddy@nvidia.com>
> ---
Reviewed-by: Niklas Cassel <cassel@kernel.org>
next prev parent reply other threads:[~2026-03-03 13:51 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-03 7:19 [PATCH v2 0/5] PCI: endpoint: Add Tegra194/234 BAR layout and pci_endpoint_test support Manikanta Maddireddy
2026-03-03 7:20 ` [PATCH v2 1/5] PCI: endpoint: Add reserved region type for MSI-X Table and PBA Manikanta Maddireddy
2026-03-03 13:46 ` Niklas Cassel
2026-03-03 7:20 ` [PATCH v2 2/5] PCI: endpoint: Allow only_64bit on BAR_RESERVED Manikanta Maddireddy
2026-03-03 13:46 ` Niklas Cassel
2026-03-03 7:20 ` [PATCH v2 3/5] PCI: tegra194: Make BAR0 programmable and remove 1MB size limit Manikanta Maddireddy
2026-03-03 13:48 ` Niklas Cassel
2026-03-03 7:20 ` [PATCH v2 4/5] PCI: tegra194: Expose BAR2 (MSI-X) and BAR4 (DMA) as 64-bit BAR_RESERVED Manikanta Maddireddy
2026-03-03 13:51 ` Niklas Cassel [this message]
2026-03-03 7:20 ` [PATCH v2 5/5] misc: pci_endpoint_test: Add Tegra194 and Tegra234 device table entries Manikanta Maddireddy
2026-03-03 13:49 ` Niklas Cassel
2026-03-21 12:32 ` [PATCH v2 0/5] PCI: endpoint: Add Tegra194/234 BAR layout and pci_endpoint_test support Manivannan Sadhasivam
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