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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, 24 Sep 2020 07:28:25 -0600 Rob Herring wrote: > CAUTION: Email originated externally, do not click links or open attachments unless you recognize the sender and know the content is safe. > > > On Thu, Sep 24, 2020 at 5:00 AM Ard Biesheuvel wrote: > > > > On Wed, 23 Sep 2020 at 08:28, Jisheng Zhang wrote: > > > > > > Currently, dw_pcie_msi_init() allocates and maps page for msi, then > > > program the PCIE_MSI_ADDR_LO and PCIE_MSI_ADDR_HI. The Root Complex > > > may lose power during suspend-to-RAM, so when we resume, we want to > > > redo the latter but not the former. If designware based driver (for > > > example, pcie-tegra194.c) calls dw_pcie_msi_init() in resume path, the > > > previous msi page will be leaked. > > > > > > Move the allocate and map msi page from dw_pcie_msi_init() to > > > dw_pcie_host_init() to fix this problem. > > > > > > Fixes: 56e15a238d92 ("PCI: tegra: Add Tegra194 PCIe support") > > > Signed-off-by: Jisheng Zhang > > > > Why do you allocate a page for this in the first place? Isn't > > PCIE_MSI_ADDR_HI:PCIE_MSI_ADDR_LO simply a magic DMA address that > > never gets forwarded across to the CPU side of the host bridge, and > > triggers a SPI instead, which gets handled by reading > > PCIE_MSI_INTR0_STATUS ? > > My question too after digging into this some more. I've asked the > question on the thread that further complicated all this changing from > virt_to_phys() to dma_map_page()[1]. > > > Couldn't you just map the zero page instead? > > Why a page even? You could use PCIE_MSI_ADDR_LO address itself even. > Or just an address in the driver data which is what some other drivers > do. > Thank Ard and Rob. I have sent out V3 (https://lkml.org/lkml/2020/9/25/272) which uses an address in the driver data for MSI address. Hi Niklas, can you please try v3 to see whether it solves your problem as well? Thanks _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel