linux-kernel - Re: [PATCH 4/6] pci/dmar/sriov: use physfn to search drhd for VF

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Date:	Thu, 08 Apr 2010 17:07:55 -0700
From:	Yinghai <yinghai.lu@...cle.com>
To:	Chris Wright <chrisw@...s-sol.org>
CC:	Yinghai <yinghai.lu@...cle.com>, Roland Dreier <rdreier@...co.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	David.Woodhouse@...el.com, fenghua.yu@...el.com,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	iommu@...ts.linux-foundation.org
Subject: Re: [PATCH 4/6] pci/dmar/sriov: use physfn to search drhd for VF

On 04/08/2010 04:24 PM, Chris Wright wrote:
> * Yinghai (yinghai.lu@...cle.com) wrote:
>> --- linux-2.6.orig/drivers/pci/dmar.c
>> +++ linux-2.6/drivers/pci/dmar.c
>> @@ -534,6 +534,8 @@ dmar_find_matched_drhd_unit(struct pci_d
>>  	struct dmar_drhd_unit *dmaru = NULL;
>>  	struct acpi_dmar_hardware_unit *drhd;
>>  
>> +	dev = pci_physfn(dev);
>> +
> 
> Yeah, we typically don't have enough VF's to wrap bus numbers, or we're
> under a catchall IOMMU.  In the catchall case both vf->bus and vf->pf->bus
> will have the same domain (segment) regardless of whether we have large
> VF count or big offset/stride.  So, I suppose this could be done inside
> of dmar_pci_device_match().
> 
> Otherwise, I think you'd want to add the same thing to
> dmar_find_matched_atsr_unit() since it's the same device scopes there.

please check

Subject: [PATCH] pci/dmar/sriov: use physfn to search drhd for VF

When virtfn is used, we should use physfn to find correct drhd

-v2: add pci_physfn() Suggested by Roland Dreier <rdreier@...co.com>
     do can remove ifdef in dmar.c
-v3: Chris pointed out we need that for dma_find_matched_atsr_unit too
     also change dmar_pci_device_match() static

Signed-off-by: Yinghai Lu <yinghai@...nel.org>
Acked-by: Roland Dreier <rdreier@...co.com>

---
 drivers/pci/dmar.c  |    6 +++++-
 include/linux/pci.h |   10 ++++++++++
 2 files changed, 15 insertions(+), 1 deletion(-)

Index: linux-2.6/drivers/pci/dmar.c
===================================================================
--- linux-2.6.orig/drivers/pci/dmar.c
+++ linux-2.6/drivers/pci/dmar.c
@@ -313,6 +313,8 @@ int dmar_find_matched_atsr_unit(struct p
 	struct acpi_dmar_atsr *atsr;
 	struct dmar_atsr_unit *atsru;
 
+	dev = pci_physfn(dev);
+
 	list_for_each_entry(atsru, &dmar_atsr_units, list) {
 		atsr = container_of(atsru->hdr, struct acpi_dmar_atsr, header);
 		if (atsr->segment == pci_domain_nr(dev->bus))
@@ -511,7 +513,7 @@ parse_dmar_table(void)
 	return ret;
 }
 
-int dmar_pci_device_match(struct pci_dev *devices[], int cnt,
+static int dmar_pci_device_match(struct pci_dev *devices[], int cnt,
 			  struct pci_dev *dev)
 {
 	int index;
@@ -534,6 +536,8 @@ dmar_find_matched_drhd_unit(struct pci_d
 	struct dmar_drhd_unit *dmaru = NULL;
 	struct acpi_dmar_hardware_unit *drhd;
 
+	dev = pci_physfn(dev);
+
 	list_for_each_entry(dmaru, &dmar_drhd_units, list) {
 		drhd = container_of(dmaru->hdr,
 				    struct acpi_dmar_hardware_unit,
Index: linux-2.6/include/linux/pci.h
===================================================================
--- linux-2.6.orig/include/linux/pci.h
+++ linux-2.6/include/linux/pci.h
@@ -334,6 +334,16 @@ struct pci_dev {
 #endif
 };
 
+static inline struct pci_dev *pci_physfn(struct pci_dev *dev)
+{
+#ifdef CONFIG_PCI_IOV
+	if (dev->is_virtfn)
+		dev = dev->physfn;
+#endif
+
+	return dev;
+}
+
 extern struct pci_dev *alloc_pci_dev(void);
 
 #define pci_dev_b(n) list_entry(n, struct pci_dev, bus_list)
--
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