| Message ID | 20210618152059.1194210-2-jean-philippe@linaro.org (mailing list archive) |
|---|---|
| State | Not Applicable, archived |
| Headers | show |
| Series | Add support for ACPI VIOT | expand |
On 2021-06-18 16:20, Jean-Philippe Brucker wrote: > Extract generic DMA setup code out of IORT, so it can be reused by VIOT. > Keep it in drivers/acpi/arm64 for now, since it could break x86 > platforms that haven't run this code so far, if they have invalid > tables. Reviewed-by: Robin Murphy <robin.murphy@arm.com> > Reviewed-by: Eric Auger <eric.auger@redhat.com> > Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org> > --- > drivers/acpi/arm64/Makefile | 1 + > include/linux/acpi.h | 3 +++ > include/linux/acpi_iort.h | 6 ++--- > drivers/acpi/arm64/dma.c | 50 ++++++++++++++++++++++++++++++++++ > drivers/acpi/arm64/iort.c | 54 ++++++------------------------------- > drivers/acpi/scan.c | 2 +- > 6 files changed, 66 insertions(+), 50 deletions(-) > create mode 100644 drivers/acpi/arm64/dma.c > > diff --git a/drivers/acpi/arm64/Makefile b/drivers/acpi/arm64/Makefile > index 6ff50f4ed947..66acbe77f46e 100644 > --- a/drivers/acpi/arm64/Makefile > +++ b/drivers/acpi/arm64/Makefile > @@ -1,3 +1,4 @@ > # SPDX-License-Identifier: GPL-2.0-only > obj-$(CONFIG_ACPI_IORT) += iort.o > obj-$(CONFIG_ACPI_GTDT) += gtdt.o > +obj-y += dma.o > diff --git a/include/linux/acpi.h b/include/linux/acpi.h > index c60745f657e9..7aaa9559cc19 100644 > --- a/include/linux/acpi.h > +++ b/include/linux/acpi.h > @@ -259,9 +259,12 @@ void acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa); > > #ifdef CONFIG_ARM64 > void acpi_numa_gicc_affinity_init(struct acpi_srat_gicc_affinity *pa); > +void acpi_arch_dma_setup(struct device *dev, u64 *dma_addr, u64 *dma_size); > #else > static inline void > acpi_numa_gicc_affinity_init(struct acpi_srat_gicc_affinity *pa) { } > +static inline void > +acpi_arch_dma_setup(struct device *dev, u64 *dma_addr, u64 *dma_size) { } > #endif > > int acpi_numa_memory_affinity_init (struct acpi_srat_mem_affinity *ma); > diff --git a/include/linux/acpi_iort.h b/include/linux/acpi_iort.h > index 1a12baa58e40..f7f054833afd 100644 > --- a/include/linux/acpi_iort.h > +++ b/include/linux/acpi_iort.h > @@ -34,7 +34,7 @@ struct irq_domain *iort_get_device_domain(struct device *dev, u32 id, > void acpi_configure_pmsi_domain(struct device *dev); > int iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id); > /* IOMMU interface */ > -void iort_dma_setup(struct device *dev, u64 *dma_addr, u64 *size); > +int iort_dma_get_ranges(struct device *dev, u64 *size); > const struct iommu_ops *iort_iommu_configure_id(struct device *dev, > const u32 *id_in); > int iort_iommu_msi_get_resv_regions(struct device *dev, struct list_head *head); > @@ -48,8 +48,8 @@ static inline struct irq_domain *iort_get_device_domain( > { return NULL; } > static inline void acpi_configure_pmsi_domain(struct device *dev) { } > /* IOMMU interface */ > -static inline void iort_dma_setup(struct device *dev, u64 *dma_addr, > - u64 *size) { } > +static inline int iort_dma_get_ranges(struct device *dev, u64 *size) > +{ return -ENODEV; } > static inline const struct iommu_ops *iort_iommu_configure_id( > struct device *dev, const u32 *id_in) > { return NULL; } > diff --git a/drivers/acpi/arm64/dma.c b/drivers/acpi/arm64/dma.c > new file mode 100644 > index 000000000000..f16739ad3cc0 > --- /dev/null > +++ b/drivers/acpi/arm64/dma.c > @@ -0,0 +1,50 @@ > +// SPDX-License-Identifier: GPL-2.0-only > +#include <linux/acpi.h> > +#include <linux/acpi_iort.h> > +#include <linux/device.h> > +#include <linux/dma-direct.h> > + > +void acpi_arch_dma_setup(struct device *dev, u64 *dma_addr, u64 *dma_size) > +{ > + int ret; > + u64 end, mask; > + u64 dmaaddr = 0, size = 0, offset = 0; > + > + /* > + * If @dev is expected to be DMA-capable then the bus code that created > + * it should have initialised its dma_mask pointer by this point. For > + * now, we'll continue the legacy behaviour of coercing it to the > + * coherent mask if not, but we'll no longer do so quietly. > + */ > + if (!dev->dma_mask) { > + dev_warn(dev, "DMA mask not set\n"); > + dev->dma_mask = &dev->coherent_dma_mask; > + } > + > + if (dev->coherent_dma_mask) > + size = max(dev->coherent_dma_mask, dev->coherent_dma_mask + 1); > + else > + size = 1ULL << 32; > + > + ret = acpi_dma_get_range(dev, &dmaaddr, &offset, &size); > + if (ret == -ENODEV) > + ret = iort_dma_get_ranges(dev, &size); > + if (!ret) { > + /* > + * Limit coherent and dma mask based on size retrieved from > + * firmware. > + */ > + end = dmaaddr + size - 1; > + mask = DMA_BIT_MASK(ilog2(end) + 1); > + dev->bus_dma_limit = end; > + dev->coherent_dma_mask = min(dev->coherent_dma_mask, mask); > + *dev->dma_mask = min(*dev->dma_mask, mask); > + } > + > + *dma_addr = dmaaddr; > + *dma_size = size; > + > + ret = dma_direct_set_offset(dev, dmaaddr + offset, dmaaddr, size); > + > + dev_dbg(dev, "dma_offset(%#08llx)%s\n", offset, ret ? " failed!" : ""); > +} > diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c > index 3912a1f6058e..a940be1cf2af 100644 > --- a/drivers/acpi/arm64/iort.c > +++ b/drivers/acpi/arm64/iort.c > @@ -1144,56 +1144,18 @@ static int rc_dma_get_range(struct device *dev, u64 *size) > } > > /** > - * iort_dma_setup() - Set-up device DMA parameters. > + * iort_dma_get_ranges() - Look up DMA addressing limit for the device > + * @dev: device to lookup > + * @size: DMA range size result pointer > * > - * @dev: device to configure > - * @dma_addr: device DMA address result pointer > - * @dma_size: DMA range size result pointer > + * Return: 0 on success, an error otherwise. > */ > -void iort_dma_setup(struct device *dev, u64 *dma_addr, u64 *dma_size) > +int iort_dma_get_ranges(struct device *dev, u64 *size) > { > - u64 end, mask, dmaaddr = 0, size = 0, offset = 0; > - int ret; > - > - /* > - * If @dev is expected to be DMA-capable then the bus code that created > - * it should have initialised its dma_mask pointer by this point. For > - * now, we'll continue the legacy behaviour of coercing it to the > - * coherent mask if not, but we'll no longer do so quietly. > - */ > - if (!dev->dma_mask) { > - dev_warn(dev, "DMA mask not set\n"); > - dev->dma_mask = &dev->coherent_dma_mask; > - } > - > - if (dev->coherent_dma_mask) > - size = max(dev->coherent_dma_mask, dev->coherent_dma_mask + 1); > + if (dev_is_pci(dev)) > + return rc_dma_get_range(dev, size); > else > - size = 1ULL << 32; > - > - ret = acpi_dma_get_range(dev, &dmaaddr, &offset, &size); > - if (ret == -ENODEV) > - ret = dev_is_pci(dev) ? rc_dma_get_range(dev, &size) > - : nc_dma_get_range(dev, &size); > - > - if (!ret) { > - /* > - * Limit coherent and dma mask based on size retrieved from > - * firmware. > - */ > - end = dmaaddr + size - 1; > - mask = DMA_BIT_MASK(ilog2(end) + 1); > - dev->bus_dma_limit = end; > - dev->coherent_dma_mask = min(dev->coherent_dma_mask, mask); > - *dev->dma_mask = min(*dev->dma_mask, mask); > - } > - > - *dma_addr = dmaaddr; > - *dma_size = size; > - > - ret = dma_direct_set_offset(dev, dmaaddr + offset, dmaaddr, size); > - > - dev_dbg(dev, "dma_offset(%#08llx)%s\n", offset, ret ? " failed!" : ""); > + return nc_dma_get_range(dev, size); > } > > static void __init acpi_iort_register_irq(int hwirq, const char *name, > diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c > index e10d38ac7cf2..ea613df8f913 100644 > --- a/drivers/acpi/scan.c > +++ b/drivers/acpi/scan.c > @@ -1537,7 +1537,7 @@ int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr, > return 0; > } > > - iort_dma_setup(dev, &dma_addr, &size); > + acpi_arch_dma_setup(dev, &dma_addr, &size); > > iommu = iort_iommu_configure_id(dev, input_id); > if (PTR_ERR(iommu) == -EPROBE_DEFER) >
diff --git a/drivers/acpi/arm64/Makefile b/drivers/acpi/arm64/Makefile index 6ff50f4ed947..66acbe77f46e 100644 --- a/drivers/acpi/arm64/Makefile +++ b/drivers/acpi/arm64/Makefile @@ -1,3 +1,4 @@ # SPDX-License-Identifier: GPL-2.0-only obj-$(CONFIG_ACPI_IORT) += iort.o obj-$(CONFIG_ACPI_GTDT) += gtdt.o +obj-y += dma.o diff --git a/include/linux/acpi.h b/include/linux/acpi.h index c60745f657e9..7aaa9559cc19 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -259,9 +259,12 @@ void acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa); #ifdef CONFIG_ARM64 void acpi_numa_gicc_affinity_init(struct acpi_srat_gicc_affinity *pa); +void acpi_arch_dma_setup(struct device *dev, u64 *dma_addr, u64 *dma_size); #else static inline void acpi_numa_gicc_affinity_init(struct acpi_srat_gicc_affinity *pa) { } +static inline void +acpi_arch_dma_setup(struct device *dev, u64 *dma_addr, u64 *dma_size) { } #endif int acpi_numa_memory_affinity_init (struct acpi_srat_mem_affinity *ma); diff --git a/include/linux/acpi_iort.h b/include/linux/acpi_iort.h index 1a12baa58e40..f7f054833afd 100644 --- a/include/linux/acpi_iort.h +++ b/include/linux/acpi_iort.h @@ -34,7 +34,7 @@ struct irq_domain *iort_get_device_domain(struct device *dev, u32 id, void acpi_configure_pmsi_domain(struct device *dev); int iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id); /* IOMMU interface */ -void iort_dma_setup(struct device *dev, u64 *dma_addr, u64 *size); +int iort_dma_get_ranges(struct device *dev, u64 *size); const struct iommu_ops *iort_iommu_configure_id(struct device *dev, const u32 *id_in); int iort_iommu_msi_get_resv_regions(struct device *dev, struct list_head *head); @@ -48,8 +48,8 @@ static inline struct irq_domain *iort_get_device_domain( { return NULL; } static inline void acpi_configure_pmsi_domain(struct device *dev) { } /* IOMMU interface */ -static inline void iort_dma_setup(struct device *dev, u64 *dma_addr, - u64 *size) { } +static inline int iort_dma_get_ranges(struct device *dev, u64 *size) +{ return -ENODEV; } static inline const struct iommu_ops *iort_iommu_configure_id( struct device *dev, const u32 *id_in) { return NULL; } diff --git a/drivers/acpi/arm64/dma.c b/drivers/acpi/arm64/dma.c new file mode 100644 index 000000000000..f16739ad3cc0 --- /dev/null +++ b/drivers/acpi/arm64/dma.c @@ -0,0 +1,50 @@ +// SPDX-License-Identifier: GPL-2.0-only +#include <linux/acpi.h> +#include <linux/acpi_iort.h> +#include <linux/device.h> +#include <linux/dma-direct.h> + +void acpi_arch_dma_setup(struct device *dev, u64 *dma_addr, u64 *dma_size) +{ + int ret; + u64 end, mask; + u64 dmaaddr = 0, size = 0, offset = 0; + + /* + * If @dev is expected to be DMA-capable then the bus code that created + * it should have initialised its dma_mask pointer by this point. For + * now, we'll continue the legacy behaviour of coercing it to the + * coherent mask if not, but we'll no longer do so quietly. + */ + if (!dev->dma_mask) { + dev_warn(dev, "DMA mask not set\n"); + dev->dma_mask = &dev->coherent_dma_mask; + } + + if (dev->coherent_dma_mask) + size = max(dev->coherent_dma_mask, dev->coherent_dma_mask + 1); + else + size = 1ULL << 32; + + ret = acpi_dma_get_range(dev, &dmaaddr, &offset, &size); + if (ret == -ENODEV) + ret = iort_dma_get_ranges(dev, &size); + if (!ret) { + /* + * Limit coherent and dma mask based on size retrieved from + * firmware. + */ + end = dmaaddr + size - 1; + mask = DMA_BIT_MASK(ilog2(end) + 1); + dev->bus_dma_limit = end; + dev->coherent_dma_mask = min(dev->coherent_dma_mask, mask); + *dev->dma_mask = min(*dev->dma_mask, mask); + } + + *dma_addr = dmaaddr; + *dma_size = size; + + ret = dma_direct_set_offset(dev, dmaaddr + offset, dmaaddr, size); + + dev_dbg(dev, "dma_offset(%#08llx)%s\n", offset, ret ? " failed!" : ""); +} diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c index 3912a1f6058e..a940be1cf2af 100644 --- a/drivers/acpi/arm64/iort.c +++ b/drivers/acpi/arm64/iort.c @@ -1144,56 +1144,18 @@ static int rc_dma_get_range(struct device *dev, u64 *size) } /** - * iort_dma_setup() - Set-up device DMA parameters. + * iort_dma_get_ranges() - Look up DMA addressing limit for the device + * @dev: device to lookup + * @size: DMA range size result pointer * - * @dev: device to configure - * @dma_addr: device DMA address result pointer - * @dma_size: DMA range size result pointer + * Return: 0 on success, an error otherwise. */ -void iort_dma_setup(struct device *dev, u64 *dma_addr, u64 *dma_size) +int iort_dma_get_ranges(struct device *dev, u64 *size) { - u64 end, mask, dmaaddr = 0, size = 0, offset = 0; - int ret; - - /* - * If @dev is expected to be DMA-capable then the bus code that created - * it should have initialised its dma_mask pointer by this point. For - * now, we'll continue the legacy behaviour of coercing it to the - * coherent mask if not, but we'll no longer do so quietly. - */ - if (!dev->dma_mask) { - dev_warn(dev, "DMA mask not set\n"); - dev->dma_mask = &dev->coherent_dma_mask; - } - - if (dev->coherent_dma_mask) - size = max(dev->coherent_dma_mask, dev->coherent_dma_mask + 1); + if (dev_is_pci(dev)) + return rc_dma_get_range(dev, size); else - size = 1ULL << 32; - - ret = acpi_dma_get_range(dev, &dmaaddr, &offset, &size); - if (ret == -ENODEV) - ret = dev_is_pci(dev) ? rc_dma_get_range(dev, &size) - : nc_dma_get_range(dev, &size); - - if (!ret) { - /* - * Limit coherent and dma mask based on size retrieved from - * firmware. - */ - end = dmaaddr + size - 1; - mask = DMA_BIT_MASK(ilog2(end) + 1); - dev->bus_dma_limit = end; - dev->coherent_dma_mask = min(dev->coherent_dma_mask, mask); - *dev->dma_mask = min(*dev->dma_mask, mask); - } - - *dma_addr = dmaaddr; - *dma_size = size; - - ret = dma_direct_set_offset(dev, dmaaddr + offset, dmaaddr, size); - - dev_dbg(dev, "dma_offset(%#08llx)%s\n", offset, ret ? " failed!" : ""); + return nc_dma_get_range(dev, size); } static void __init acpi_iort_register_irq(int hwirq, const char *name, diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index e10d38ac7cf2..ea613df8f913 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -1537,7 +1537,7 @@ int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr, return 0; } - iort_dma_setup(dev, &dma_addr, &size); + acpi_arch_dma_setup(dev, &dma_addr, &size); iommu = iort_iommu_configure_id(dev, input_id); if (PTR_ERR(iommu) == -EPROBE_DEFER)