| Message ID | 20220830030139.29899-2-lvjianmin@loongson.cn (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Headers | show |
| Series | DMA: update acpi_dma_get_range to return dma map regions | expand |
On 2022-08-30 04:01, Jianmin Lv wrote: > For DT, of_dma_get_range returns bus_dma_region typed dma regions, > which makes multiple dma windows with different offset available > for translation between dma address and cpu address. > > But for ACPI, acpi_dma_get_range doesn't return similar dma regions, > causing no path for setting dev->dma_range_map conveniently. So the > patch changes acpi_dma_get_range and returns bus_dma_region typed > dma regions according to of_dma_get_range. > > After changing acpi_dma_get_range, acpi_arch_dma_setup is changed for > ARM64, where original dma_addr and size are removed as these > arguments are now redundant, and pass 0 and U64_MAX for dma_base > and size of arch_setup_dma_ops, so this is a simplification consistent > with what other ACPI architectures also pass to iommu_setup_dma_ops(). Other than a micro-nit that acpi_dma_get_range() could probably use resource_size(), Reviewed-by: Robin Murphy <robin.murphy@arm.com> It took me longer than I care to admit to figure out where the implicit declaration of struct bus_dma_region in the scope of acpi.h and acpi_bus.h comes from, but in the end I guess it's sufficiently well-defined by the C spec to be reliable. Thanks for getting this done! Robin. > Signed-off-by: Jianmin Lv <lvjianmin@loongson.cn> > --- > drivers/acpi/arm64/dma.c | 29 ++++++++++++++++---------- > drivers/acpi/scan.c | 53 +++++++++++++++++++++--------------------------- > include/acpi/acpi_bus.h | 3 +-- > include/linux/acpi.h | 7 +++---- > 4 files changed, 45 insertions(+), 47 deletions(-) > > diff --git a/drivers/acpi/arm64/dma.c b/drivers/acpi/arm64/dma.c > index f16739a..1ef8e7d 100644 > --- a/drivers/acpi/arm64/dma.c > +++ b/drivers/acpi/arm64/dma.c > @@ -4,11 +4,12 @@ > #include <linux/device.h> > #include <linux/dma-direct.h> > > -void acpi_arch_dma_setup(struct device *dev, u64 *dma_addr, u64 *dma_size) > +void acpi_arch_dma_setup(struct device *dev) > { > int ret; > u64 end, mask; > - u64 dmaaddr = 0, size = 0, offset = 0; > + u64 size = 0; > + const struct bus_dma_region *map = NULL; > > /* > * If @dev is expected to be DMA-capable then the bus code that created > @@ -26,25 +27,31 @@ void acpi_arch_dma_setup(struct device *dev, u64 *dma_addr, u64 *dma_size) > else > size = 1ULL << 32; > > - ret = acpi_dma_get_range(dev, &dmaaddr, &offset, &size); > + ret = acpi_dma_get_range(dev, &map); > + if (!ret && map) { > + const struct bus_dma_region *r = map; > + > + for (end = 0; r->size; r++) { > + if (r->dma_start + r->size - 1 > end) > + end = r->dma_start + r->size - 1; > + } > + > + size = end + 1; > + dev->dma_range_map = map; > + } > + > 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; > + end = 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/scan.c b/drivers/acpi/scan.c > index 762b61f..8c0c2ca 100644 > --- a/drivers/acpi/scan.c > +++ b/drivers/acpi/scan.c > @@ -20,6 +20,7 @@ > #include <linux/platform_data/x86/apple.h> > #include <linux/pgtable.h> > #include <linux/crc32.h> > +#include <linux/dma-direct.h> > > #include "internal.h" > > @@ -1482,25 +1483,21 @@ enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev) > * acpi_dma_get_range() - Get device DMA parameters. > * > * @dev: device to configure > - * @dma_addr: pointer device DMA address result > - * @offset: pointer to the DMA offset result > - * @size: pointer to DMA range size result > + * @map: pointer to DMA ranges result > * > - * Evaluate DMA regions and return respectively DMA region start, offset > - * and size in dma_addr, offset and size on parsing success; it does not > - * update the passed in values on failure. > + * Evaluate DMA regions and return pointer to DMA regions on > + * parsing success; it does not update the passed in values on failure. > * > * Return 0 on success, < 0 on failure. > */ > -int acpi_dma_get_range(struct device *dev, u64 *dma_addr, u64 *offset, > - u64 *size) > +int acpi_dma_get_range(struct device *dev, const struct bus_dma_region **map) > { > struct acpi_device *adev; > LIST_HEAD(list); > struct resource_entry *rentry; > int ret; > struct device *dma_dev = dev; > - u64 len, dma_start = U64_MAX, dma_end = 0, dma_offset = 0; > + struct bus_dma_region *r; > > /* > * Walk the device tree chasing an ACPI companion with a _DMA > @@ -1525,31 +1522,28 @@ int acpi_dma_get_range(struct device *dev, u64 *dma_addr, u64 *offset, > > ret = acpi_dev_get_dma_resources(adev, &list); > if (ret > 0) { > + r = kcalloc(ret + 1, sizeof(*r), GFP_KERNEL); > + if (!r) { > + ret = -ENOMEM; > + goto out; > + } > + > + *map = r; > + > list_for_each_entry(rentry, &list, node) { > - if (dma_offset && rentry->offset != dma_offset) { > + if (rentry->res->start >= rentry->res->end) { > ret = -EINVAL; > - dev_warn(dma_dev, "Can't handle multiple windows with different offsets\n"); > + dev_dbg(dma_dev, "Invalid DMA regions configuration\n"); > goto out; > } > - dma_offset = rentry->offset; > > - /* Take lower and upper limits */ > - if (rentry->res->start < dma_start) > - dma_start = rentry->res->start; > - if (rentry->res->end > dma_end) > - dma_end = rentry->res->end; > - } > - > - if (dma_start >= dma_end) { > - ret = -EINVAL; > - dev_dbg(dma_dev, "Invalid DMA regions configuration\n"); > - goto out; > + r->cpu_start = rentry->res->start; > + r->dma_start = rentry->res->start - rentry->offset; > + r->size = rentry->res->end - rentry->res->start + 1; > + r->offset = rentry->offset; > + r++; > } > > - *dma_addr = dma_start - dma_offset; > - len = dma_end - dma_start; > - *size = max(len, len + 1); > - *offset = dma_offset; > } > out: > acpi_dev_free_resource_list(&list); > @@ -1639,20 +1633,19 @@ int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr, > const u32 *input_id) > { > const struct iommu_ops *iommu; > - u64 dma_addr = 0, size = 0; > > if (attr == DEV_DMA_NOT_SUPPORTED) { > set_dma_ops(dev, &dma_dummy_ops); > return 0; > } > > - acpi_arch_dma_setup(dev, &dma_addr, &size); > + acpi_arch_dma_setup(dev); > > iommu = acpi_iommu_configure_id(dev, input_id); > if (PTR_ERR(iommu) == -EPROBE_DEFER) > return -EPROBE_DEFER; > > - arch_setup_dma_ops(dev, dma_addr, size, > + arch_setup_dma_ops(dev, 0, U64_MAX, > iommu, attr == DEV_DMA_COHERENT); > > return 0; > diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h > index 0dc1ea0b..e106073 100644 > --- a/include/acpi/acpi_bus.h > +++ b/include/acpi/acpi_bus.h > @@ -611,8 +611,7 @@ struct acpi_pci_root { > int acpi_iommu_fwspec_init(struct device *dev, u32 id, > struct fwnode_handle *fwnode, > const struct iommu_ops *ops); > -int acpi_dma_get_range(struct device *dev, u64 *dma_addr, u64 *offset, > - u64 *size); > +int acpi_dma_get_range(struct device *dev, const struct bus_dma_region **map); > int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr, > const u32 *input_id); > static inline int acpi_dma_configure(struct device *dev, > diff --git a/include/linux/acpi.h b/include/linux/acpi.h > index 44975c1..34e0545 100644 > --- a/include/linux/acpi.h > +++ b/include/linux/acpi.h > @@ -280,12 +280,12 @@ int acpi_table_parse_madt(enum acpi_madt_type id, > > #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); > +void acpi_arch_dma_setup(struct device *dev); > #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) { } > +acpi_arch_dma_setup(struct device *dev) { } > #endif > > int acpi_numa_memory_affinity_init (struct acpi_srat_mem_affinity *ma); > @@ -974,8 +974,7 @@ static inline enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev) > return DEV_DMA_NOT_SUPPORTED; > } > > -static inline int acpi_dma_get_range(struct device *dev, u64 *dma_addr, > - u64 *offset, u64 *size) > +static inline int acpi_dma_get_range(struct device *dev, const struct bus_dma_region **map) > { > return -ENODEV; > }
On 2022/9/5 下午8:20, Robin Murphy wrote: > On 2022-08-30 04:01, Jianmin Lv wrote: >> For DT, of_dma_get_range returns bus_dma_region typed dma regions, >> which makes multiple dma windows with different offset available >> for translation between dma address and cpu address. >> >> But for ACPI, acpi_dma_get_range doesn't return similar dma regions, >> causing no path for setting dev->dma_range_map conveniently. So the >> patch changes acpi_dma_get_range and returns bus_dma_region typed >> dma regions according to of_dma_get_range. >> >> After changing acpi_dma_get_range, acpi_arch_dma_setup is changed for >> ARM64, where original dma_addr and size are removed as these >> arguments are now redundant, and pass 0 and U64_MAX for dma_base >> and size of arch_setup_dma_ops, so this is a simplification consistent >> with what other ACPI architectures also pass to iommu_setup_dma_ops(). > > Other than a micro-nit that acpi_dma_get_range() could probably use > resource_size(), > Ok, thanks, I'll use resource_size() in acpi_dma_get_range(). > Reviewed-by: Robin Murphy <robin.murphy@arm.com> > > It took me longer than I care to admit to figure out where the implicit > declaration of struct bus_dma_region in the scope of acpi.h and > acpi_bus.h comes from, but in the end I guess it's sufficiently > well-defined by the C spec to be reliable. > > Thanks for getting this done! > It's a pleasure! > Robin. > [...]
On Tue, Sep 06, 2022 at 08:40:48PM +0800, Jianmin Lv wrote: > > > On 2022/9/5 下午8:20, Robin Murphy wrote: > > On 2022-08-30 04:01, Jianmin Lv wrote: > > > For DT, of_dma_get_range returns bus_dma_region typed dma regions, > > > which makes multiple dma windows with different offset available > > > for translation between dma address and cpu address. > > > > > > But for ACPI, acpi_dma_get_range doesn't return similar dma regions, > > > causing no path for setting dev->dma_range_map conveniently. So the > > > patch changes acpi_dma_get_range and returns bus_dma_region typed > > > dma regions according to of_dma_get_range. > > > > > > After changing acpi_dma_get_range, acpi_arch_dma_setup is changed for > > > ARM64, where original dma_addr and size are removed as these > > > arguments are now redundant, and pass 0 and U64_MAX for dma_base > > > and size of arch_setup_dma_ops, so this is a simplification consistent > > > with what other ACPI architectures also pass to iommu_setup_dma_ops(). > > > > Other than a micro-nit that acpi_dma_get_range() could probably use > > resource_size(), > > > > Ok, thanks, I'll use resource_size() in acpi_dma_get_range(). Are you reposting this shortly ? We are almost at -rc5, it would be good if we can proceed promptly. Thanks, Lorenzo > > Reviewed-by: Robin Murphy <robin.murphy@arm.com> > > > > It took me longer than I care to admit to figure out where the implicit > > declaration of struct bus_dma_region in the scope of acpi.h and > > acpi_bus.h comes from, but in the end I guess it's sufficiently > > well-defined by the C spec to be reliable. > > > > Thanks for getting this done! > > > > It's a pleasure! > > > > Robin. > > > > [...] > >
On 2022/9/9 下午4:04, Lorenzo Pieralisi wrote: > On Tue, Sep 06, 2022 at 08:40:48PM +0800, Jianmin Lv wrote: >> >> >> On 2022/9/5 下午8:20, Robin Murphy wrote: >>> On 2022-08-30 04:01, Jianmin Lv wrote: >>>> For DT, of_dma_get_range returns bus_dma_region typed dma regions, >>>> which makes multiple dma windows with different offset available >>>> for translation between dma address and cpu address. >>>> >>>> But for ACPI, acpi_dma_get_range doesn't return similar dma regions, >>>> causing no path for setting dev->dma_range_map conveniently. So the >>>> patch changes acpi_dma_get_range and returns bus_dma_region typed >>>> dma regions according to of_dma_get_range. >>>> >>>> After changing acpi_dma_get_range, acpi_arch_dma_setup is changed for >>>> ARM64, where original dma_addr and size are removed as these >>>> arguments are now redundant, and pass 0 and U64_MAX for dma_base >>>> and size of arch_setup_dma_ops, so this is a simplification consistent >>>> with what other ACPI architectures also pass to iommu_setup_dma_ops(). >>> >>> Other than a micro-nit that acpi_dma_get_range() could probably use >>> resource_size(), >>> >> >> Ok, thanks, I'll use resource_size() in acpi_dma_get_range(). > > Are you reposting this shortly ? We are almost at -rc5, it would > be good if we can proceed promptly. > > Thanks, > Lorenzo > Ok, I'll send V4 today. Thanks, Jianmin >>> Reviewed-by: Robin Murphy <robin.murphy@arm.com> >>> >>> It took me longer than I care to admit to figure out where the implicit >>> declaration of struct bus_dma_region in the scope of acpi.h and >>> acpi_bus.h comes from, but in the end I guess it's sufficiently >>> well-defined by the C spec to be reliable. >>> >>> Thanks for getting this done! >>> >> >> It's a pleasure! >> >> >>> Robin. >>> >> >> [...] >> >>
diff --git a/drivers/acpi/arm64/dma.c b/drivers/acpi/arm64/dma.c index f16739a..1ef8e7d 100644 --- a/drivers/acpi/arm64/dma.c +++ b/drivers/acpi/arm64/dma.c @@ -4,11 +4,12 @@ #include <linux/device.h> #include <linux/dma-direct.h> -void acpi_arch_dma_setup(struct device *dev, u64 *dma_addr, u64 *dma_size) +void acpi_arch_dma_setup(struct device *dev) { int ret; u64 end, mask; - u64 dmaaddr = 0, size = 0, offset = 0; + u64 size = 0; + const struct bus_dma_region *map = NULL; /* * If @dev is expected to be DMA-capable then the bus code that created @@ -26,25 +27,31 @@ void acpi_arch_dma_setup(struct device *dev, u64 *dma_addr, u64 *dma_size) else size = 1ULL << 32; - ret = acpi_dma_get_range(dev, &dmaaddr, &offset, &size); + ret = acpi_dma_get_range(dev, &map); + if (!ret && map) { + const struct bus_dma_region *r = map; + + for (end = 0; r->size; r++) { + if (r->dma_start + r->size - 1 > end) + end = r->dma_start + r->size - 1; + } + + size = end + 1; + dev->dma_range_map = map; + } + 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; + end = 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/scan.c b/drivers/acpi/scan.c index 762b61f..8c0c2ca 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -20,6 +20,7 @@ #include <linux/platform_data/x86/apple.h> #include <linux/pgtable.h> #include <linux/crc32.h> +#include <linux/dma-direct.h> #include "internal.h" @@ -1482,25 +1483,21 @@ enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev) * acpi_dma_get_range() - Get device DMA parameters. * * @dev: device to configure - * @dma_addr: pointer device DMA address result - * @offset: pointer to the DMA offset result - * @size: pointer to DMA range size result + * @map: pointer to DMA ranges result * - * Evaluate DMA regions and return respectively DMA region start, offset - * and size in dma_addr, offset and size on parsing success; it does not - * update the passed in values on failure. + * Evaluate DMA regions and return pointer to DMA regions on + * parsing success; it does not update the passed in values on failure. * * Return 0 on success, < 0 on failure. */ -int acpi_dma_get_range(struct device *dev, u64 *dma_addr, u64 *offset, - u64 *size) +int acpi_dma_get_range(struct device *dev, const struct bus_dma_region **map) { struct acpi_device *adev; LIST_HEAD(list); struct resource_entry *rentry; int ret; struct device *dma_dev = dev; - u64 len, dma_start = U64_MAX, dma_end = 0, dma_offset = 0; + struct bus_dma_region *r; /* * Walk the device tree chasing an ACPI companion with a _DMA @@ -1525,31 +1522,28 @@ int acpi_dma_get_range(struct device *dev, u64 *dma_addr, u64 *offset, ret = acpi_dev_get_dma_resources(adev, &list); if (ret > 0) { + r = kcalloc(ret + 1, sizeof(*r), GFP_KERNEL); + if (!r) { + ret = -ENOMEM; + goto out; + } + + *map = r; + list_for_each_entry(rentry, &list, node) { - if (dma_offset && rentry->offset != dma_offset) { + if (rentry->res->start >= rentry->res->end) { ret = -EINVAL; - dev_warn(dma_dev, "Can't handle multiple windows with different offsets\n"); + dev_dbg(dma_dev, "Invalid DMA regions configuration\n"); goto out; } - dma_offset = rentry->offset; - /* Take lower and upper limits */ - if (rentry->res->start < dma_start) - dma_start = rentry->res->start; - if (rentry->res->end > dma_end) - dma_end = rentry->res->end; - } - - if (dma_start >= dma_end) { - ret = -EINVAL; - dev_dbg(dma_dev, "Invalid DMA regions configuration\n"); - goto out; + r->cpu_start = rentry->res->start; + r->dma_start = rentry->res->start - rentry->offset; + r->size = rentry->res->end - rentry->res->start + 1; + r->offset = rentry->offset; + r++; } - *dma_addr = dma_start - dma_offset; - len = dma_end - dma_start; - *size = max(len, len + 1); - *offset = dma_offset; } out: acpi_dev_free_resource_list(&list); @@ -1639,20 +1633,19 @@ int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr, const u32 *input_id) { const struct iommu_ops *iommu; - u64 dma_addr = 0, size = 0; if (attr == DEV_DMA_NOT_SUPPORTED) { set_dma_ops(dev, &dma_dummy_ops); return 0; } - acpi_arch_dma_setup(dev, &dma_addr, &size); + acpi_arch_dma_setup(dev); iommu = acpi_iommu_configure_id(dev, input_id); if (PTR_ERR(iommu) == -EPROBE_DEFER) return -EPROBE_DEFER; - arch_setup_dma_ops(dev, dma_addr, size, + arch_setup_dma_ops(dev, 0, U64_MAX, iommu, attr == DEV_DMA_COHERENT); return 0; diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h index 0dc1ea0b..e106073 100644 --- a/include/acpi/acpi_bus.h +++ b/include/acpi/acpi_bus.h @@ -611,8 +611,7 @@ struct acpi_pci_root { int acpi_iommu_fwspec_init(struct device *dev, u32 id, struct fwnode_handle *fwnode, const struct iommu_ops *ops); -int acpi_dma_get_range(struct device *dev, u64 *dma_addr, u64 *offset, - u64 *size); +int acpi_dma_get_range(struct device *dev, const struct bus_dma_region **map); int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr, const u32 *input_id); static inline int acpi_dma_configure(struct device *dev, diff --git a/include/linux/acpi.h b/include/linux/acpi.h index 44975c1..34e0545 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -280,12 +280,12 @@ int acpi_table_parse_madt(enum acpi_madt_type id, #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); +void acpi_arch_dma_setup(struct device *dev); #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) { } +acpi_arch_dma_setup(struct device *dev) { } #endif int acpi_numa_memory_affinity_init (struct acpi_srat_mem_affinity *ma); @@ -974,8 +974,7 @@ static inline enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev) return DEV_DMA_NOT_SUPPORTED; } -static inline int acpi_dma_get_range(struct device *dev, u64 *dma_addr, - u64 *offset, u64 *size) +static inline int acpi_dma_get_range(struct device *dev, const struct bus_dma_region **map) { return -ENODEV; }
For DT, of_dma_get_range returns bus_dma_region typed dma regions, which makes multiple dma windows with different offset available for translation between dma address and cpu address. But for ACPI, acpi_dma_get_range doesn't return similar dma regions, causing no path for setting dev->dma_range_map conveniently. So the patch changes acpi_dma_get_range and returns bus_dma_region typed dma regions according to of_dma_get_range. After changing acpi_dma_get_range, acpi_arch_dma_setup is changed for ARM64, where original dma_addr and size are removed as these arguments are now redundant, and pass 0 and U64_MAX for dma_base and size of arch_setup_dma_ops, so this is a simplification consistent with what other ACPI architectures also pass to iommu_setup_dma_ops(). Signed-off-by: Jianmin Lv <lvjianmin@loongson.cn> --- drivers/acpi/arm64/dma.c | 29 ++++++++++++++++---------- drivers/acpi/scan.c | 53 +++++++++++++++++++++--------------------------- include/acpi/acpi_bus.h | 3 +-- include/linux/acpi.h | 7 +++---- 4 files changed, 45 insertions(+), 47 deletions(-)