On Wed, 11 Nov 2015 12:03:39 +0530
Bharat Kumar Gogada <bharat.kumar.gogada@xxxxxxxxxx> wrote:
> Adding PCIe Root Port driver for Xilinx PCIe NWL bridge IP.
>
> Signed-off-by: Bharat Kumar Gogada <bharatku@xxxxxxxxxx>
> Signed-off-by: Ravi Kiran Gummaluri <rgummal@xxxxxxxxxx>
> ---
> Added logic to allocate contiguous hwirq in nwl_irq_domain_alloc function.
> Moved MSI functionality to separate functions.
> Changed error return values.
> ---
> .../devicetree/bindings/pci/xilinx-nwl-pcie.txt | 68 ++
> drivers/pci/host/Kconfig | 16 +-
> drivers/pci/host/Makefile | 1 +
> drivers/pci/host/pcie-xilinx-nwl.c | 1062 ++++++++++++++++++++
> 4 files changed, 1144 insertions(+), 3 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/pci/xilinx-nwl-pcie.txt
> create mode 100644 drivers/pci/host/pcie-xilinx-nwl.c
>
> diff --git a/drivers/pci/host/pcie-xilinx-nwl.c b/drivers/pci/host/pcie-xilinx-nwl.c
> new file mode 100644
> index 0000000..8bc509c
> --- /dev/null
> +++ b/drivers/pci/host/pcie-xilinx-nwl.c
[...]
> +static struct msi_domain_info nwl_msi_domain_info = {
> + .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
> + MSI_FLAG_MULTI_PCI_MSI),
Given that you claim to support multi-MSI...
[...]
> +static int nwl_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
> + unsigned int nr_irqs, void *args)
> +{
> + struct nwl_pcie *pcie = domain->host_data;
> + struct nwl_msi *msi = &pcie->msi;
> + unsigned long bit;
> + int i;
> +
> + mutex_lock(&msi->lock);
> + for (i = 0; i < nr_irqs; i++) {
> + bit = find_first_zero_bit(msi->used, INT_PCI_MSI_NR);
> + if (bit < INT_PCI_MSI_NR)
> + set_bit(bit, msi->used);
> + else
> + bit = -ENOSPC;
> +
> + if (bit < 0) {
> + mutex_unlock(&msi->lock);
> + return bit;
> + }
> +
> + irq_domain_set_info(domain, virq, bit, &nwl_irq_chip,
> + domain->host_data, handle_simple_irq,
> + NULL, NULL);
> + virq = virq + 1;
> + }
I really don't see how this allocator guarantees that all hwirqs are
contiguous. I already mentioned this when reviewing v7, and you still
haven't got it right. So either you allocate *contiguous* hwirqs in an
atomic fashion, or you drop support for multi-MSI.
Thanks,
M.
--
Jazz is not dead. It just smells funny.
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