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authorEric W. Biederman <ebiederm@xmission.com>2006-10-04 02:16:35 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-10-04 07:55:27 -0700
commit92db6d10bc1bc43330a4c540fa5b64c83d9d865f (patch)
treed889ea4ba6d2e55a33d89f05d2b2222bed7788e7 /arch/i386/pci
parent38bc0361303535c86f6b67b151a541728d7bdae6 (diff)
[PATCH] genirq: msi: simplify the msi irq limit policy
Currently we attempt to predict how many irqs we will be able to allocate with msi using pci_vector_resources and some complicated accounting, and then we only allow each device as many irqs as we think are available on average. Only the s2io driver even takes advantage of this feature all other drivers have a fixed number of irqs they need and bail if they can't get them. pci_vector_resources is inaccurate if anyone ever frees an irq. The whole implmentation is racy. The current irq limit policy does not appear to make sense with current drivers. So I have simplified things. We can revisit this we we need a more sophisticated policy. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Rajesh Shah <rajesh.shah@intel.com> Cc: Andi Kleen <ak@muc.de> Cc: "Protasevich, Natalie" <Natalie.Protasevich@UNISYS.com> Cc: "Luck, Tony" <tony.luck@intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/i386/pci')
-rw-r--r--arch/i386/pci/irq.c30
1 files changed, 0 insertions, 30 deletions
diff --git a/arch/i386/pci/irq.c b/arch/i386/pci/irq.c
index 4a8995c9c76..960f364cab6 100644
--- a/arch/i386/pci/irq.c
+++ b/arch/i386/pci/irq.c
@@ -1169,33 +1169,3 @@ static int pirq_enable_irq(struct pci_dev *dev)
}
return 0;
}
-
-int pci_vector_resources(int last, int nr_released)
-{
- int count = nr_released;
-
- int next = last;
- int offset = (last % 8);
-
- while (next < FIRST_SYSTEM_VECTOR) {
- next += 8;
-#ifdef CONFIG_X86_64
- if (next == IA32_SYSCALL_VECTOR)
- continue;
-#else
- if (next == SYSCALL_VECTOR)
- continue;
-#endif
- count++;
- if (next >= FIRST_SYSTEM_VECTOR) {
- if (offset%8) {
- next = FIRST_DEVICE_VECTOR + offset;
- offset++;
- continue;
- }
- count--;
- }
- }
-
- return count;
-}