Re: [PATCH v2] iommu/intel-iommu: fix pasid table size encoding
On Tue, Dec 06, 2016 at 10:14:23AM -0800, Jacob Pan wrote: > drivers/iommu/intel-iommu.c | 23 ++- > 1 file changed, 22 insertions(+), 1 deletion(-) Applied to the fixes branch, thanks.
Re: [PATCH v2] iommu/intel-iommu: fix pasid table size encoding
On Thu, Dec 15, 2016 at 12:07:10PM -0800, Raj, Ashok wrote: > Haven't heard about it from David yet, but can we queue this for 4.10? > If you have any questions/concerns please let us know. I'll queue the fix when rc1 is out. Joerg
Re: [PATCH v2] iommu/intel-iommu: fix pasid table size encoding
Hi David/Joerg Haven't heard about it from David yet, but can we queue this for 4.10? If you have any questions/concerns please let us know. Cheers, Ashok On Wed, Dec 14, 2016 at 02:36:40PM +0200, Mika Kuoppala wrote: > > > > cc: Mika Kuoppala > > cc: Ashok Raj > > Signed-off-by: Jacob Pan > > Tested-by: Mika Kuoppala Signed-of-by: Ashok Raj > > > --- > > drivers/iommu/intel-iommu.c | 23 ++- > > 1 file changed, 22 insertions(+), 1 deletion(-) > >
Re: [PATCH v2] iommu/intel-iommu: fix pasid table size encoding
Jacob Pan writes: > Different encodings are used to represent supported PASID bits > and number of PASID table entries. > The current code assigns ecap_pss directly to extended context > table entry PTS which is wrong and could result in writing > non-zero bits to the reserved fields. IOMMU fault reason > 11 will be reported when reserved bits are nonzero. > This patch converts ecap_pss to extend context entry pts encoding > based on VT-d spec. Chapter 9.4 as follows: > - number of PASID bits = ecap_pss + 1 > - number of PASID table entries = 2^(pts + 5) > Software assigned limit of pasid_max value is also respected to > match the allocation limitation of PASID table. > > cc: Mika Kuoppala > cc: Ashok Raj > Signed-off-by: Jacob Pan Tested-by: Mika Kuoppala > --- > drivers/iommu/intel-iommu.c | 23 ++- > 1 file changed, 22 insertions(+), 1 deletion(-) > > diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c > index 27596e6..5d9cddc 100644 > --- a/drivers/iommu/intel-iommu.c > +++ b/drivers/iommu/intel-iommu.c > @@ -5173,6 +5173,25 @@ static void intel_iommu_remove_device(struct device > *dev) > } > > #ifdef CONFIG_INTEL_IOMMU_SVM > +#define MAX_NR_PASID_BITS (20) > +static inline unsigned long intel_iommu_get_pts(struct intel_iommu *iommu) > +{ > + /* > + * Convert ecap_pss to extend context entry pts encoding, also > + * respect the soft pasid_max value set by the iommu. > + * - number of PASID bits = ecap_pss + 1 > + * - number of PASID table entries = 2^(pts + 5) > + * Therefore, pts = ecap_pss - 4 > + * e.g. KBL ecap_pss = 0x13, PASID has 20 bits, pts = 15 > + */ > + if (ecap_pss(iommu->ecap) < 5) > + return 0; > + > + /* pasid_max is encoded as actual number of entries not the bits */ > + return find_first_bit((unsigned long *)&iommu->pasid_max, > + MAX_NR_PASID_BITS) - 5; > +} > + > int intel_iommu_enable_pasid(struct intel_iommu *iommu, struct intel_svm_dev > *sdev) > { > struct device_domain_info *info; > @@ -5205,7 +5224,9 @@ int intel_iommu_enable_pasid(struct intel_iommu *iommu, > struct intel_svm_dev *sd > > if (!(ctx_lo & CONTEXT_PASIDE)) { > context[1].hi = (u64)virt_to_phys(iommu->pasid_state_table); > - context[1].lo = (u64)virt_to_phys(iommu->pasid_table) | > ecap_pss(iommu->ecap); > + context[1].lo = (u64)virt_to_phys(iommu->pasid_table) | > + intel_iommu_get_pts(iommu); > + > wmb(); > /* CONTEXT_TT_MULTI_LEVEL and CONTEXT_TT_DEV_IOTLB are both >* extended to permit requests-with-PASID if the PASIDE bit > -- > 2.7.4
Re: [PATCH v2] iommu/intel-iommu: fix pasid table size encoding
Hi Joerg/David, Just wondering if you have any more comments? Thanks, Jacob On Tue, 6 Dec 2016 10:14:23 -0800 Jacob Pan wrote: > Different encodings are used to represent supported PASID bits > and number of PASID table entries. > The current code assigns ecap_pss directly to extended context > table entry PTS which is wrong and could result in writing > non-zero bits to the reserved fields. IOMMU fault reason > 11 will be reported when reserved bits are nonzero. > This patch converts ecap_pss to extend context entry pts encoding > based on VT-d spec. Chapter 9.4 as follows: > - number of PASID bits = ecap_pss + 1 > - number of PASID table entries = 2^(pts + 5) > Software assigned limit of pasid_max value is also respected to > match the allocation limitation of PASID table. > > cc: Mika Kuoppala > cc: Ashok Raj > Signed-off-by: Jacob Pan > --- > drivers/iommu/intel-iommu.c | 23 ++- > 1 file changed, 22 insertions(+), 1 deletion(-) > > diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c > index 27596e6..5d9cddc 100644 > --- a/drivers/iommu/intel-iommu.c > +++ b/drivers/iommu/intel-iommu.c > @@ -5173,6 +5173,25 @@ static void intel_iommu_remove_device(struct > device *dev) } > > #ifdef CONFIG_INTEL_IOMMU_SVM > +#define MAX_NR_PASID_BITS (20) > +static inline unsigned long intel_iommu_get_pts(struct intel_iommu > *iommu) +{ > + /* > + * Convert ecap_pss to extend context entry pts encoding, > also > + * respect the soft pasid_max value set by the iommu. > + * - number of PASID bits = ecap_pss + 1 > + * - number of PASID table entries = 2^(pts + 5) > + * Therefore, pts = ecap_pss - 4 > + * e.g. KBL ecap_pss = 0x13, PASID has 20 bits, pts = 15 > + */ > + if (ecap_pss(iommu->ecap) < 5) > + return 0; > + > + /* pasid_max is encoded as actual number of entries not the > bits */ > + return find_first_bit((unsigned long *)&iommu->pasid_max, > + MAX_NR_PASID_BITS) - 5; > +} > + > int intel_iommu_enable_pasid(struct intel_iommu *iommu, struct > intel_svm_dev *sdev) { > struct device_domain_info *info; > @@ -5205,7 +5224,9 @@ int intel_iommu_enable_pasid(struct intel_iommu > *iommu, struct intel_svm_dev *sd > if (!(ctx_lo & CONTEXT_PASIDE)) { > context[1].hi = > (u64)virt_to_phys(iommu->pasid_state_table); > - context[1].lo = > (u64)virt_to_phys(iommu->pasid_table) | ecap_pss(iommu->ecap); > + context[1].lo = > (u64)virt_to_phys(iommu->pasid_table) | > + intel_iommu_get_pts(iommu); > + > wmb(); > /* CONTEXT_TT_MULTI_LEVEL and CONTEXT_TT_DEV_IOTLB > are both >* extended to permit requests-with-PASID if the > PASIDE bit [Jacob Pan]
[PATCH v2] iommu/intel-iommu: fix pasid table size encoding
Different encodings are used to represent supported PASID bits and number of PASID table entries. The current code assigns ecap_pss directly to extended context table entry PTS which is wrong and could result in writing non-zero bits to the reserved fields. IOMMU fault reason 11 will be reported when reserved bits are nonzero. This patch converts ecap_pss to extend context entry pts encoding based on VT-d spec. Chapter 9.4 as follows: - number of PASID bits = ecap_pss + 1 - number of PASID table entries = 2^(pts + 5) Software assigned limit of pasid_max value is also respected to match the allocation limitation of PASID table. cc: Mika Kuoppala cc: Ashok Raj Signed-off-by: Jacob Pan --- drivers/iommu/intel-iommu.c | 23 ++- 1 file changed, 22 insertions(+), 1 deletion(-) diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index 27596e6..5d9cddc 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -5173,6 +5173,25 @@ static void intel_iommu_remove_device(struct device *dev) } #ifdef CONFIG_INTEL_IOMMU_SVM +#define MAX_NR_PASID_BITS (20) +static inline unsigned long intel_iommu_get_pts(struct intel_iommu *iommu) +{ + /* +* Convert ecap_pss to extend context entry pts encoding, also +* respect the soft pasid_max value set by the iommu. +* - number of PASID bits = ecap_pss + 1 +* - number of PASID table entries = 2^(pts + 5) +* Therefore, pts = ecap_pss - 4 +* e.g. KBL ecap_pss = 0x13, PASID has 20 bits, pts = 15 +*/ + if (ecap_pss(iommu->ecap) < 5) + return 0; + + /* pasid_max is encoded as actual number of entries not the bits */ + return find_first_bit((unsigned long *)&iommu->pasid_max, + MAX_NR_PASID_BITS) - 5; +} + int intel_iommu_enable_pasid(struct intel_iommu *iommu, struct intel_svm_dev *sdev) { struct device_domain_info *info; @@ -5205,7 +5224,9 @@ int intel_iommu_enable_pasid(struct intel_iommu *iommu, struct intel_svm_dev *sd if (!(ctx_lo & CONTEXT_PASIDE)) { context[1].hi = (u64)virt_to_phys(iommu->pasid_state_table); - context[1].lo = (u64)virt_to_phys(iommu->pasid_table) | ecap_pss(iommu->ecap); + context[1].lo = (u64)virt_to_phys(iommu->pasid_table) | + intel_iommu_get_pts(iommu); + wmb(); /* CONTEXT_TT_MULTI_LEVEL and CONTEXT_TT_DEV_IOTLB are both * extended to permit requests-with-PASID if the PASIDE bit -- 2.7.4