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Message-ID: <49A8541C.4030601@kernel.org>
Date: Fri, 27 Feb 2009 12:59:08 -0800
From: Yinghai Lu <yinghai@...nel.org>
To: Prakash Punnoor <prakash@...noor.de>
CC: Jesse Barnes <jbarnes@...tuousgeek.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Ingo Molnar <mingo@...e.hu>,
"Eric W. Biederman" <ebiederm@...ssion.com>,
Robert Hancock <hancockrwd@...il.com>, david@...g.hm,
Matthew Wilcox <matthew@....cx>,
linux-kernel <linux-kernel@...r.kernel.org>,
linux-pci@...r.kernel.org
Subject: Re: [PATCH] pci: don't enable too many HT MSI mapping
Prakash Punnoor wrote:
> On Dienstag 24 Februar 2009 18:37:35 Jesse Barnes wrote:
>> On Monday, February 23, 2009 11:51:59 am Yinghai Lu wrote:
>>> Impact: fix bug
>>>
>>> Prakash reported that his c51-mcp51 system ondie sound card doesn't work
>>> MSI but if he hack out the HT-MSI on mcp51, the MSI will work well with
>>> sound card.
>>>
>>> this patch rework the nv_msi_ht_cap_quirk()
>>> and will only enable ht_msi on own root device and try to avoid to enable
>>> ht_msi on device following that root dev
>>>
>>> Reported-by: Prakash Punnoor <prakash@...noor.de>
>>> Tested-by: Prakash Punnoor <prakash@...noor.de>
>>> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
>> Thanks Yinghai & Prakash, applied this fix to my for-linus branch.
>
> I am very sorry, but I made a mistake testing this patch. I messed up my
> kernels and got a false positive and only noticed this now. The patch does NOT
> work and even makes things worse:
>
> dmesg|grep HT
> pci 0000:00:09.0: Found disabled HT MSI Mapping
> pci 0000:00:09.0: Enabling HT MSI Mapping
> pci 0000:00:09.0: Found enabled HT MSI Mapping
> pci 0000:00:09.0: Found enabled HT MSI Mapping
> pci 0000:00:09.0: Found enabled HT MSI Mapping
> pci 0000:00:09.0: Found enabled HT MSI Mapping
>
> This is exactly the device which shouldn't be MSI enabled for me. On the other
> hand, it doesn't enable the needed devices anymore.
>
please check this one, please power off the system before load the kernel with new patch.
[PATCH] pci: don't enable too much HT MSI mapping -v2
Impact: fix bug
Prakash reported that his c51-mcp51 system ondie sound card doesn't work MSI
but if he hack out the HT-MSI on mcp51, the MSI will work well with sound card.
this patch rework the nv_msi_ht_cap_quirk()
and will only try to avoid to enable ht_msi on device following that root dev,
and don't touch that root dev
Reported-by: Prakash Punnoor <prakash@...noor.de>
Signed-off-by: Yinghai Lu <yinghai@...nel.org>
---
drivers/pci/quirks.c | 119 ++++++++++++++++++++++++++++++++++++++++++++-------
1 file changed, 104 insertions(+), 15 deletions(-)
Index: linux-2.6/drivers/pci/quirks.c
===================================================================
--- linux-2.6.orig/drivers/pci/quirks.c
+++ linux-2.6/drivers/pci/quirks.c
@@ -2050,10 +2050,104 @@ DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NV
PCI_DEVICE_ID_NVIDIA_NVENET_15,
nvenet_msi_disable);
-static void __devinit nv_msi_ht_cap_quirk(struct pci_dev *dev)
+static void __devinit nv_ht_enable_msi_mapping(struct pci_dev *dev)
{
struct pci_dev *host_bridge;
+ int pos;
+ int i, dev_no;
+ int found = 0;
+
+ dev_no = dev->devfn >> 3;
+ for (i = dev_no; i >= 0; i--) {
+ host_bridge = pci_get_slot(dev->bus, PCI_DEVFN(i, 0));
+ if (!host_bridge)
+ continue;
+
+ pos = pci_find_ht_capability(host_bridge, HT_CAPTYPE_SLAVE);
+ if (pos != 0) {
+ found = 1;
+ break;
+ }
+ pci_dev_put(host_bridge);
+ }
+
+ if (!found)
+ return;
+
+ /* don't enable host_bridge directly here */
+ if (host_bridge == dev)
+ goto out;
+
+ /* root did that ! */
+ if (msi_ht_cap_enabled(host_bridge))
+ goto out;
+
+ ht_enable_msi_mapping(dev);
+
+out:
+ pci_dev_put(host_bridge);
+}
+
+static void __devinit ht_disable_msi_mapping(struct pci_dev *dev)
+{
+ int pos, ttl = 48;
+
+ pos = pci_find_ht_capability(dev, HT_CAPTYPE_MSI_MAPPING);
+ while (pos && ttl--) {
+ u8 flags;
+
+ if (pci_read_config_byte(dev, pos + HT_MSI_FLAGS,
+ &flags) == 0) {
+ dev_info(&dev->dev, "Enabling HT MSI Mapping\n");
+
+ pci_write_config_byte(dev, pos + HT_MSI_FLAGS,
+ flags & ~HT_MSI_FLAGS_ENABLE);
+ }
+ pos = pci_find_next_ht_capability(dev, pos,
+ HT_CAPTYPE_MSI_MAPPING);
+ }
+}
+
+static int __devinit ht_check_msi_mapping(struct pci_dev *dev)
+{
int pos, ttl = 48;
+ int found = 0;
+
+ /* check if there is HT MSI cap or enabled on this device */
+ pos = pci_find_ht_capability(dev, HT_CAPTYPE_MSI_MAPPING);
+ while (pos && ttl--) {
+ u8 flags;
+
+ if (found < 1)
+ found = 1;
+ if (pci_read_config_byte(dev, pos + HT_MSI_FLAGS,
+ &flags) == 0) {
+ if (flags & HT_MSI_FLAGS_ENABLE) {
+ if (found < 2) {
+ found = 2;
+ break;
+ }
+ }
+ }
+ pos = pci_find_next_ht_capability(dev, pos,
+ HT_CAPTYPE_MSI_MAPPING);
+ }
+
+ return found;
+}
+
+static void __devinit nv_msi_ht_cap_quirk(struct pci_dev *dev)
+{
+ struct pci_dev *host_bridge;
+ int pos;
+ int found;
+
+ /* check if there is HT MSI cap or enabled on this device */
+ found = ht_check_msi_mapping(dev);
+
+ /* no HT MSI CAP */
+ if (found == 0)
+ return;
/*
* HT MSI mapping should be disabled on devices that are below
@@ -2069,24 +2163,19 @@ static void __devinit nv_msi_ht_cap_quir
pos = pci_find_ht_capability(host_bridge, HT_CAPTYPE_SLAVE);
if (pos != 0) {
/* Host bridge is to HT */
- ht_enable_msi_mapping(dev);
+ if (found == 1) {
+ /* it is not enabled, try to enable it */
+ nv_ht_enable_msi_mapping(dev);
+ }
return;
}
- /* Host bridge is not to HT, disable HT MSI mapping on this device */
- pos = pci_find_ht_capability(dev, HT_CAPTYPE_MSI_MAPPING);
- while (pos && ttl--) {
- u8 flags;
+ /* HT MSI is not enabled */
+ if (found == 1)
+ return;
- if (pci_read_config_byte(dev, pos + HT_MSI_FLAGS,
- &flags) == 0) {
- dev_info(&dev->dev, "Disabling HT MSI mapping");
- pci_write_config_byte(dev, pos + HT_MSI_FLAGS,
- flags & ~HT_MSI_FLAGS_ENABLE);
- }
- pos = pci_find_next_ht_capability(dev, pos,
- HT_CAPTYPE_MSI_MAPPING);
- }
+ /* Host bridge is not to HT, disable HT MSI mapping on this device */
+ ht_disable_msi_mapping(dev);
}
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID, nv_msi_ht_cap_quirk);
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_AL, PCI_ANY_ID, nv_msi_ht_cap_quirk);
--
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