Re: [Xen-devel] [PATCH 1/3] pci/xen: Use xen_allocate_pirq_msi

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Thu, Feb 17, 2011 at 09:30:03AM -0500, Konrad Rzeszutek Wilk wrote:
> On Thu, Feb 17, 2011 at 08:41:31AM +0000, Ian Campbell wrote:
> > On Wed, 2011-02-16 at 22:17 +0000, Konrad Rzeszutek Wilk wrote:
> > > There is no need to use the old interface.
> > 
> > xen_allocate_pirq -> xen_map_pirq_gsi -> PHYSDEVOP_alloc_irq_vector IFF
> > xen_initial_domain() in addition to the kernel side book-keeping side of
> > things (set chip and handler, update irq_info etc) whereas
> > xen_allocate_pirq_msi just does the kernel book keeping.
> > 
> > Also xen_allocate_pirq allocates an IRQ in the 1-1 GSI space whereas
> > xen_allocate_pirq_msi allocates a dynamic one in the >GSI IRQ space.
> 
> Which is OK. These are MSIs.
> > 
> > So this change is actually a semantic change and not just a switch to a
> > new interface. I think the change is OK (because the caller is domU
> 
> Right.
> 
> > only?) but a comment explaining this would be appreciated.
> 
> Correct: "domU side".
> 
> Will fix it up.

How does this look to you?

>From eb832bece3131ecbdb509f7f2a9bc53f6692177c Mon Sep 17 00:00:00 2001
From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Date: Wed, 16 Feb 2011 13:43:04 -0500
Subject: [PATCH 3/5] pci/xen: Use xen_allocate_pirq_msi instead of 
xen_allocate_pirq

xen_allocate_pirq -> xen_map_pirq_gsi -> PHYSDEVOP_alloc_irq_vector IFF
xen_initial_domain() in addition to the kernel side book-keeping side of
things (set chip and handler, update irq_info etc) whereas
xen_allocate_pirq_msi just does the kernel book keeping.

Also xen_allocate_pirq allocates an IRQ in the 1-1 GSI space whereas
xen_allocate_pirq_msi allocates a dynamic one in the >GSI IRQ space.

All of this is uneccessary as this code path is only executed
when we run as a domU PV guest with an MSI/MSI-X PCI card passed in.
Hence we can jump straight to allocating an dynamic IRQ (and
binding it to the proper PIRQ) and skip the rest.

In short: this change is a cosmetic one.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
---
 arch/x86/pci/xen.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c
index 25cd4a0..6432f75 100644
--- a/arch/x86/pci/xen.c
+++ b/arch/x86/pci/xen.c
@@ -157,14 +157,14 @@ static int xen_setup_msi_irqs(struct pci_dev *dev, int 
nvec, int type)
                goto error;
        i = 0;
        list_for_each_entry(msidesc, &dev->msi_list, list) {
-               irq = xen_allocate_pirq(v[i], 0, /* not sharable */
+               xen_allocate_pirq_msi(
                        (type == PCI_CAP_ID_MSIX) ?
-                       "pcifront-msi-x" : "pcifront-msi");
+                       "pcifront-msi-x" : "pcifront-msi",
+                       &irq, &v[i], XEN_ALLOC_IRQ);
                if (irq < 0) {
                        ret = -1;
                        goto free;
                }
-
                ret = set_irq_msi(irq, msidesc);
                if (ret)
                        goto error_while;
-- 
1.7.1


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