Hi Lorenzo,

On 07/02/19 10:18 PM, Lorenzo Pieralisi wrote:

On Thu, Feb 07, 2019 at 04:39:21PM +0530, Kishon Vijay Abraham I wrote:

quoted

Platforms using Designware IP uses dw_pci_msi_bottom_irq_chip for
configuring the MSI controller logic within the Designware IP. However
certain platforms like Keystone (K2G) which uses Desingware IP has
it's own MSI controller logic. For handling such platforms,
the irqchip ops uses msi_irq_ack, msi_set_irq, msi_clear_irq callback
functions.

Add support to use different msi_irq_chip with default as
dw_pci_msi_bottom_irq_chip. This is in preparation to get rid off
msi_irq_ack, msi_set_irq, msi_clear_irq and other Keystone specific
dw_pcie_host_ops. This will also help to get rid of get_msi_addr and
get_msi_data ops.

Signed-off-by: Kishon Vijay Abraham I <redacted>
---
 drivers/pci/controller/dwc/pcie-designware-host.c | 5 ++++-
 drivers/pci/controller/dwc/pcie-designware.h      | 1 +
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index 721d60a5d9e4..042de09b0451 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c

@@ -245,7 +245,7 @@ static int dw_pcie_irq_domain_alloc(struct irq_domain *domain,
 
 	for (i = 0; i < nr_irqs; i++)
 		irq_domain_set_info(domain, virq + i, bit + i,
-				    &dw_pci_msi_bottom_irq_chip,
+				    pp->msi_irq_chip,
 				    pp, handle_edge_irq,
 				    NULL, NULL);
 

@@ -277,6 +277,9 @@ int dw_pcie_allocate_domains(struct pcie_port *pp)
 	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
 	struct fwnode_handle *fwnode = of_node_to_fwnode(pci->dev->of_node);
 
+	if (!pp->msi_irq_chip)
+		pp->msi_irq_chip = &dw_pci_msi_bottom_irq_chip;

I think it is better to initialize pp->msi_irq_chip outside
dw_pcie_allocate_domains(), it makes things clearer.

In:

dw_pcie_host_init() for dwc

or

msi_host_init() for platforms with that hook implemented.

Is there any gotcha I am missing ?

I added here only to avoid breaking "git bisect". Next patch adds
ks_pcie_msi_irq_chip in msi_host_init of keystone. However till then it has to
use dw_pci_msi_bottom_irq_chip. Adding anywhere else in dw_pcie_host_init would
mean msi_irq_chip is uninitialized for keystone.

Maybe I can add that in the commit log and move it to dw_pcie_host_init?

Thanks
Kishon

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