linux-kernel - RE: [PATCH v2] PCI: xilinx-nwl: Fix Multi MSI data programming

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Date:   Mon, 1 Apr 2019 17:00:40 +0000
From:   Bharat Kumar Gogada <bharatku@...inx.com>
To:     Bharat Kumar Gogada <bharatku@...inx.com>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>
CC:     "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v2] PCI: xilinx-nwl: Fix Multi MSI data programming

Hi All,

Please let me know if anyone has any inputs on this.

Regards,
Bharat
> 
> The current Multi MSI data programming fails if multiple end points
> requesting MSI and multi MSI are connected with switch, i.e the current
> multi MSI data being given is not considering the number of vectors being
> requested in case of multi MSI.
> Due to this if multiple end points are connected and requesting MSI and
> multi MSI combination, the multi MSI data is ending up using wrong MSI
> data, which might be used by different device.
> 
> Fix Multi MSI data programming with required alignment by using number
> of vectors being requested.
> 
> Fixes: ab597d35ef11 ("PCI: xilinx-nwl: Add support for Xilinx NWL PCIe Host
> Controller")
> Signed-off-by: Bharat Kumar Gogada <bharat.kumar.gogada@...inx.com>
> ---
> V2:
>  - Added more description of fix
> ---
>  drivers/pci/controller/pcie-xilinx-nwl.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/controller/pcie-xilinx-nwl.c
> b/drivers/pci/controller/pcie-xilinx-nwl.c
> index 81538d7..36669c5 100644
> --- a/drivers/pci/controller/pcie-xilinx-nwl.c
> +++ b/drivers/pci/controller/pcie-xilinx-nwl.c
> @@ -484,7 +484,7 @@ static int nwl_irq_domain_alloc(struct irq_domain
> *domain, unsigned int virq,
> 
>  	mutex_lock(&msi->lock);
>  	bit = bitmap_find_next_zero_area(msi->bitmap, INT_PCI_MSI_NR, 0,
> -					 nr_irqs, 0);
> +					 nr_irqs, nr_irqs - 1);
>  	if (bit >= INT_PCI_MSI_NR) {
>  		mutex_unlock(&msi->lock);
>  		return -ENOSPC;
> --
> 2.7.4