| Message ID | 20161205122619.25045-1-lorenzo.pieralisi@arm.com (mailing list archive) |
|---|---|
| State | Not Applicable, archived |
| Headers | show |
On Mon, Dec 5, 2016 at 1:26 PM, Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> wrote: > The introduction of acpi_dma_configure() allows to configure DMA > and related IOMMU for any device that is DMA capable. To achieve > that goal it ensures DMA masks are set-up to sane default values > before proceeding with IOMMU and DMA ops configuration. > > On x86/ia64 systems, through acpi_bind_one(), acpi_dma_configure() is > called for every device that has an ACPI companion, in that every device > is considered DMA capable on x86/ia64 systems (ie acpi_get_dma_attr() API), > which has the side effect of initializing dma masks also for > pseudo-devices (eg CPUs and memory nodes) and potentially for devices > whose dma masks were not set-up before the acpi_dma_configure() API was > introduced, which may have noxious side effects. > > Therefore, in preparation for IORT firmware specific DMA masks set-up, > wrap the default DMA masks set-up in acpi_dma_configure() inside an IORT > specific wrapper that reverts to a NOP on x86/ia64 systems, restoring the > default expected behaviour on x86/ia64 systems and keeping DMA default > masks set-up on IORT based (ie ARM) arch configurations. > > Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> > Cc: Will Deacon <will.deacon@arm.com> > Cc: Hanjun Guo <hanjun.guo@linaro.org> > Cc: Bjorn Helgaas <bhelgaas@google.com> > Cc: Robin Murphy <robin.murphy@arm.com> > Cc: Tomasz Nowicki <tn@semihalf.com> > Cc: Joerg Roedel <joro@8bytes.org> > Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> > Cc: Sricharan R <sricharan@codeaurora.org> Acked -by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > --- > Joerg, > > pending Rafael's ACK on it, given the 4.10 release timing and that the > series is queued via the IOMMU tree please consider applying this patch to > your arm/smmu branch for 4.10, it is not fixing a bug but it is modifying > the x86/ia64 code path; I prefer preventing any issue related to default > dma masks on x86/ia64 so I hope it can get merged along with the rest of > the ACPI IORT SMMU series. > > Thanks a lot and apologies, > Lorenzo > > drivers/acpi/arm64/iort.c | 22 ++++++++++++++++++++++ > drivers/acpi/scan.c | 14 +------------- > include/linux/acpi_iort.h | 2 ++ > 3 files changed, 25 insertions(+), 13 deletions(-) > > diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c > index 47bace8..e0d2e6e 100644 > --- a/drivers/acpi/arm64/iort.c > +++ b/drivers/acpi/arm64/iort.c > @@ -547,6 +547,28 @@ static const struct iommu_ops *iort_iommu_xlate(struct device *dev, > } > > /** > + * iort_set_dma_mask - Set-up dma mask for a device. > + * > + * @dev: device to configure > + */ > +void iort_set_dma_mask(struct device *dev) > +{ > + /* > + * Set default coherent_dma_mask to 32 bit. Drivers are expected to > + * setup the correct supported mask. > + */ > + if (!dev->coherent_dma_mask) > + dev->coherent_dma_mask = DMA_BIT_MASK(32); > + > + /* > + * Set it to coherent_dma_mask by default if the architecture > + * code has not set it. > + */ > + if (!dev->dma_mask) > + dev->dma_mask = &dev->coherent_dma_mask; > +} > + > +/** > * iort_iommu_configure - Set-up IOMMU configuration for a device. > * > * @dev: device to configure > diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c > index 80698d3..93b00cf 100644 > --- a/drivers/acpi/scan.c > +++ b/drivers/acpi/scan.c > @@ -1380,19 +1380,7 @@ void acpi_dma_configure(struct device *dev, enum dev_dma_attr attr) > { > const struct iommu_ops *iommu; > > - /* > - * Set default coherent_dma_mask to 32 bit. Drivers are expected to > - * setup the correct supported mask. > - */ > - if (!dev->coherent_dma_mask) > - dev->coherent_dma_mask = DMA_BIT_MASK(32); > - > - /* > - * Set it to coherent_dma_mask by default if the architecture > - * code has not set it. > - */ > - if (!dev->dma_mask) > - dev->dma_mask = &dev->coherent_dma_mask; > + iort_set_dma_mask(dev); > > iommu = iort_iommu_configure(dev); > > diff --git a/include/linux/acpi_iort.h b/include/linux/acpi_iort.h > index dcb2b60..77e0809 100644 > --- a/include/linux/acpi_iort.h > +++ b/include/linux/acpi_iort.h > @@ -35,6 +35,7 @@ bool iort_node_match(u8 type); > u32 iort_msi_map_rid(struct device *dev, u32 req_id); > struct irq_domain *iort_get_device_domain(struct device *dev, u32 req_id); > /* IOMMU interface */ > +void iort_set_dma_mask(struct device *dev); > const struct iommu_ops *iort_iommu_configure(struct device *dev); > #else > static inline void acpi_iort_init(void) { } > @@ -45,6 +46,7 @@ static inline struct irq_domain *iort_get_device_domain(struct device *dev, > u32 req_id) > { return NULL; } > /* IOMMU interface */ > +static inline void iort_set_dma_mask(struct device *dev) { } > static inline > const struct iommu_ops *iort_iommu_configure(struct device *dev) > { return NULL; } > -- > 2.10.0 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-acpi" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On 2016/12/5 20:26, Lorenzo Pieralisi wrote: > The introduction of acpi_dma_configure() allows to configure DMA > and related IOMMU for any device that is DMA capable. To achieve > that goal it ensures DMA masks are set-up to sane default values > before proceeding with IOMMU and DMA ops configuration. > > On x86/ia64 systems, through acpi_bind_one(), acpi_dma_configure() is > called for every device that has an ACPI companion, in that every device > is considered DMA capable on x86/ia64 systems (ie acpi_get_dma_attr() API), > which has the side effect of initializing dma masks also for > pseudo-devices (eg CPUs and memory nodes) and potentially for devices > whose dma masks were not set-up before the acpi_dma_configure() API was > introduced, which may have noxious side effects. > > Therefore, in preparation for IORT firmware specific DMA masks set-up, > wrap the default DMA masks set-up in acpi_dma_configure() inside an IORT > specific wrapper that reverts to a NOP on x86/ia64 systems, restoring the > default expected behaviour on x86/ia64 systems and keeping DMA default > masks set-up on IORT based (ie ARM) arch configurations. > > Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> > Cc: Will Deacon <will.deacon@arm.com> > Cc: Hanjun Guo <hanjun.guo@linaro.org> Add this patch on top of your v9 acpi smmu patchset, tested on Hisilicon D03 (ARM64), devices with SMMU enabled work fine, Tested-by: Hanjun Guo <hanjun.guo@linaro.org> Reviewed-by: Hanjun Guo <hanjun.guo@linaro.org> Thanks Hanjun -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Hi Joerg, On Mon, Dec 05, 2016 at 11:18:56PM +0100, Rafael J. Wysocki wrote: > On Mon, Dec 5, 2016 at 1:26 PM, Lorenzo Pieralisi > <lorenzo.pieralisi@arm.com> wrote: > > The introduction of acpi_dma_configure() allows to configure DMA > > and related IOMMU for any device that is DMA capable. To achieve > > that goal it ensures DMA masks are set-up to sane default values > > before proceeding with IOMMU and DMA ops configuration. > > > > On x86/ia64 systems, through acpi_bind_one(), acpi_dma_configure() is > > called for every device that has an ACPI companion, in that every device > > is considered DMA capable on x86/ia64 systems (ie acpi_get_dma_attr() API), > > which has the side effect of initializing dma masks also for > > pseudo-devices (eg CPUs and memory nodes) and potentially for devices > > whose dma masks were not set-up before the acpi_dma_configure() API was > > introduced, which may have noxious side effects. > > > > Therefore, in preparation for IORT firmware specific DMA masks set-up, > > wrap the default DMA masks set-up in acpi_dma_configure() inside an IORT > > specific wrapper that reverts to a NOP on x86/ia64 systems, restoring the > > default expected behaviour on x86/ia64 systems and keeping DMA default > > masks set-up on IORT based (ie ARM) arch configurations. > > > > Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> > > Cc: Will Deacon <will.deacon@arm.com> > > Cc: Hanjun Guo <hanjun.guo@linaro.org> > > Cc: Bjorn Helgaas <bhelgaas@google.com> > > Cc: Robin Murphy <robin.murphy@arm.com> > > Cc: Tomasz Nowicki <tn@semihalf.com> > > Cc: Joerg Roedel <joro@8bytes.org> > > Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> > > Cc: Sricharan R <sricharan@codeaurora.org> > > Acked -by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > > > --- > > Joerg, > > > > pending Rafael's ACK on it, given the 4.10 release timing and that the > > series is queued via the IOMMU tree please consider applying this patch to > > your arm/smmu branch for 4.10, it is not fixing a bug but it is modifying > > the x86/ia64 code path; I prefer preventing any issue related to default > > dma masks on x86/ia64 so I hope it can get merged along with the rest of > > the ACPI IORT SMMU series. I can apply Rafael and Hanjun's tags and resend a v2 to you if you prefer, it would be great if you could apply this patch to your arm/smmu branch for v4.10 as per description above, please let me know. Thank you ! Lorenzo > > > > Thanks a lot and apologies, > > Lorenzo > > > > drivers/acpi/arm64/iort.c | 22 ++++++++++++++++++++++ > > drivers/acpi/scan.c | 14 +------------- > > include/linux/acpi_iort.h | 2 ++ > > 3 files changed, 25 insertions(+), 13 deletions(-) > > > > diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c > > index 47bace8..e0d2e6e 100644 > > --- a/drivers/acpi/arm64/iort.c > > +++ b/drivers/acpi/arm64/iort.c > > @@ -547,6 +547,28 @@ static const struct iommu_ops *iort_iommu_xlate(struct device *dev, > > } > > > > /** > > + * iort_set_dma_mask - Set-up dma mask for a device. > > + * > > + * @dev: device to configure > > + */ > > +void iort_set_dma_mask(struct device *dev) > > +{ > > + /* > > + * Set default coherent_dma_mask to 32 bit. Drivers are expected to > > + * setup the correct supported mask. > > + */ > > + if (!dev->coherent_dma_mask) > > + dev->coherent_dma_mask = DMA_BIT_MASK(32); > > + > > + /* > > + * Set it to coherent_dma_mask by default if the architecture > > + * code has not set it. > > + */ > > + if (!dev->dma_mask) > > + dev->dma_mask = &dev->coherent_dma_mask; > > +} > > + > > +/** > > * iort_iommu_configure - Set-up IOMMU configuration for a device. > > * > > * @dev: device to configure > > diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c > > index 80698d3..93b00cf 100644 > > --- a/drivers/acpi/scan.c > > +++ b/drivers/acpi/scan.c > > @@ -1380,19 +1380,7 @@ void acpi_dma_configure(struct device *dev, enum dev_dma_attr attr) > > { > > const struct iommu_ops *iommu; > > > > - /* > > - * Set default coherent_dma_mask to 32 bit. Drivers are expected to > > - * setup the correct supported mask. > > - */ > > - if (!dev->coherent_dma_mask) > > - dev->coherent_dma_mask = DMA_BIT_MASK(32); > > - > > - /* > > - * Set it to coherent_dma_mask by default if the architecture > > - * code has not set it. > > - */ > > - if (!dev->dma_mask) > > - dev->dma_mask = &dev->coherent_dma_mask; > > + iort_set_dma_mask(dev); > > > > iommu = iort_iommu_configure(dev); > > > > diff --git a/include/linux/acpi_iort.h b/include/linux/acpi_iort.h > > index dcb2b60..77e0809 100644 > > --- a/include/linux/acpi_iort.h > > +++ b/include/linux/acpi_iort.h > > @@ -35,6 +35,7 @@ bool iort_node_match(u8 type); > > u32 iort_msi_map_rid(struct device *dev, u32 req_id); > > struct irq_domain *iort_get_device_domain(struct device *dev, u32 req_id); > > /* IOMMU interface */ > > +void iort_set_dma_mask(struct device *dev); > > const struct iommu_ops *iort_iommu_configure(struct device *dev); > > #else > > static inline void acpi_iort_init(void) { } > > @@ -45,6 +46,7 @@ static inline struct irq_domain *iort_get_device_domain(struct device *dev, > > u32 req_id) > > { return NULL; } > > /* IOMMU interface */ > > +static inline void iort_set_dma_mask(struct device *dev) { } > > static inline > > const struct iommu_ops *iort_iommu_configure(struct device *dev) > > { return NULL; } > > -- > > 2.10.0 > > > > -- > > To unsubscribe from this list: send the line "unsubscribe linux-acpi" in > > the body of a message to majordomo@vger.kernel.org > > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Mon, Dec 05, 2016 at 12:26:19PM +0000, Lorenzo Pieralisi wrote: > The introduction of acpi_dma_configure() allows to configure DMA > and related IOMMU for any device that is DMA capable. To achieve > that goal it ensures DMA masks are set-up to sane default values > before proceeding with IOMMU and DMA ops configuration. > > On x86/ia64 systems, through acpi_bind_one(), acpi_dma_configure() is > called for every device that has an ACPI companion, in that every device > is considered DMA capable on x86/ia64 systems (ie acpi_get_dma_attr() API), > which has the side effect of initializing dma masks also for > pseudo-devices (eg CPUs and memory nodes) and potentially for devices > whose dma masks were not set-up before the acpi_dma_configure() API was > introduced, which may have noxious side effects. > > Therefore, in preparation for IORT firmware specific DMA masks set-up, > wrap the default DMA masks set-up in acpi_dma_configure() inside an IORT > specific wrapper that reverts to a NOP on x86/ia64 systems, restoring the > default expected behaviour on x86/ia64 systems and keeping DMA default > masks set-up on IORT based (ie ARM) arch configurations. > > Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> > Cc: Will Deacon <will.deacon@arm.com> > Cc: Hanjun Guo <hanjun.guo@linaro.org> > Cc: Bjorn Helgaas <bhelgaas@google.com> > Cc: Robin Murphy <robin.murphy@arm.com> > Cc: Tomasz Nowicki <tn@semihalf.com> > Cc: Joerg Roedel <joro@8bytes.org> > Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> > Cc: Sricharan R <sricharan@codeaurora.org> > --- > Joerg, > > pending Rafael's ACK on it, given the 4.10 release timing and that the > series is queued via the IOMMU tree please consider applying this patch to > your arm/smmu branch for 4.10, it is not fixing a bug but it is modifying > the x86/ia64 code path; I prefer preventing any issue related to default > dma masks on x86/ia64 so I hope it can get merged along with the rest of > the ACPI IORT SMMU series. > > Thanks a lot and apologies, > Lorenzo > > drivers/acpi/arm64/iort.c | 22 ++++++++++++++++++++++ > drivers/acpi/scan.c | 14 +------------- > include/linux/acpi_iort.h | 2 ++ > 3 files changed, 25 insertions(+), 13 deletions(-) Looks straightforward to me: Acked-by: Will Deacon <will.deacon@arm.com> Joerg can probably just pick this on top of his queue. Will -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Hi Lorenzo, On Tue, Dec 06, 2016 at 09:37:10AM +0000, Lorenzo Pieralisi wrote: > I can apply Rafael and Hanjun's tags and resend a v2 to you if you > prefer, it would be great if you could apply this patch to your arm/smmu > branch for v4.10 as per description above, please let me know. Yes, please collect all the tags and send me a v2 please. I'll apply it the right away. Thanks, Joerg -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Tue, Dec 06, 2016 at 02:24:48PM +0100, Joerg Roedel wrote: > Hi Lorenzo, > > On Tue, Dec 06, 2016 at 09:37:10AM +0000, Lorenzo Pieralisi wrote: > > I can apply Rafael and Hanjun's tags and resend a v2 to you if you > > prefer, it would be great if you could apply this patch to your arm/smmu > > branch for v4.10 as per description above, please let me know. > > Yes, please collect all the tags and send me a v2 please. I'll apply it > the right away. Thank you very much, I have just sent it. Thanks ! Lorenzo -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c index 47bace8..e0d2e6e 100644 --- a/drivers/acpi/arm64/iort.c +++ b/drivers/acpi/arm64/iort.c @@ -547,6 +547,28 @@ static const struct iommu_ops *iort_iommu_xlate(struct device *dev, } /** + * iort_set_dma_mask - Set-up dma mask for a device. + * + * @dev: device to configure + */ +void iort_set_dma_mask(struct device *dev) +{ + /* + * Set default coherent_dma_mask to 32 bit. Drivers are expected to + * setup the correct supported mask. + */ + if (!dev->coherent_dma_mask) + dev->coherent_dma_mask = DMA_BIT_MASK(32); + + /* + * Set it to coherent_dma_mask by default if the architecture + * code has not set it. + */ + if (!dev->dma_mask) + dev->dma_mask = &dev->coherent_dma_mask; +} + +/** * iort_iommu_configure - Set-up IOMMU configuration for a device. * * @dev: device to configure diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index 80698d3..93b00cf 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -1380,19 +1380,7 @@ void acpi_dma_configure(struct device *dev, enum dev_dma_attr attr) { const struct iommu_ops *iommu; - /* - * Set default coherent_dma_mask to 32 bit. Drivers are expected to - * setup the correct supported mask. - */ - if (!dev->coherent_dma_mask) - dev->coherent_dma_mask = DMA_BIT_MASK(32); - - /* - * Set it to coherent_dma_mask by default if the architecture - * code has not set it. - */ - if (!dev->dma_mask) - dev->dma_mask = &dev->coherent_dma_mask; + iort_set_dma_mask(dev); iommu = iort_iommu_configure(dev); diff --git a/include/linux/acpi_iort.h b/include/linux/acpi_iort.h index dcb2b60..77e0809 100644 --- a/include/linux/acpi_iort.h +++ b/include/linux/acpi_iort.h @@ -35,6 +35,7 @@ bool iort_node_match(u8 type); u32 iort_msi_map_rid(struct device *dev, u32 req_id); struct irq_domain *iort_get_device_domain(struct device *dev, u32 req_id); /* IOMMU interface */ +void iort_set_dma_mask(struct device *dev); const struct iommu_ops *iort_iommu_configure(struct device *dev); #else static inline void acpi_iort_init(void) { } @@ -45,6 +46,7 @@ static inline struct irq_domain *iort_get_device_domain(struct device *dev, u32 req_id) { return NULL; } /* IOMMU interface */ +static inline void iort_set_dma_mask(struct device *dev) { } static inline const struct iommu_ops *iort_iommu_configure(struct device *dev) { return NULL; }
The introduction of acpi_dma_configure() allows to configure DMA and related IOMMU for any device that is DMA capable. To achieve that goal it ensures DMA masks are set-up to sane default values before proceeding with IOMMU and DMA ops configuration. On x86/ia64 systems, through acpi_bind_one(), acpi_dma_configure() is called for every device that has an ACPI companion, in that every device is considered DMA capable on x86/ia64 systems (ie acpi_get_dma_attr() API), which has the side effect of initializing dma masks also for pseudo-devices (eg CPUs and memory nodes) and potentially for devices whose dma masks were not set-up before the acpi_dma_configure() API was introduced, which may have noxious side effects. Therefore, in preparation for IORT firmware specific DMA masks set-up, wrap the default DMA masks set-up in acpi_dma_configure() inside an IORT specific wrapper that reverts to a NOP on x86/ia64 systems, restoring the default expected behaviour on x86/ia64 systems and keeping DMA default masks set-up on IORT based (ie ARM) arch configurations. Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Hanjun Guo <hanjun.guo@linaro.org> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Robin Murphy <robin.murphy@arm.com> Cc: Tomasz Nowicki <tn@semihalf.com> Cc: Joerg Roedel <joro@8bytes.org> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> Cc: Sricharan R <sricharan@codeaurora.org> --- Joerg, pending Rafael's ACK on it, given the 4.10 release timing and that the series is queued via the IOMMU tree please consider applying this patch to your arm/smmu branch for 4.10, it is not fixing a bug but it is modifying the x86/ia64 code path; I prefer preventing any issue related to default dma masks on x86/ia64 so I hope it can get merged along with the rest of the ACPI IORT SMMU series. Thanks a lot and apologies, Lorenzo drivers/acpi/arm64/iort.c | 22 ++++++++++++++++++++++ drivers/acpi/scan.c | 14 +------------- include/linux/acpi_iort.h | 2 ++ 3 files changed, 25 insertions(+), 13 deletions(-)