diff options
| author | Robin Murphy <robin.murphy@arm.com> | 2024-04-19 18:54:42 +0200 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2024-04-26 12:07:23 +0200 |
| commit | 91cfd679f9e8b9a7bf2f26adf66eff99dbe2026b (patch) | |
| tree | ca69e75a2bba33ccc84f4685f6282291cdb6ff4e /drivers/acpi | |
| parent | OF: Simplify DMA range calculations (diff) | |
| download | linux-91cfd679f9e8b9a7bf2f26adf66eff99dbe2026b.tar.xz linux-91cfd679f9e8b9a7bf2f26adf66eff99dbe2026b.zip | |
ACPI/IORT: Handle memory address size limits as limits
Return the Root Complex/Named Component memory address size limit as an
inclusive limit value, rather than an exclusive size. This saves having
to fudge an off-by-one for the 64-bit case, and simplifies our caller.
Acked-by: Hanjun Guo <guohanjun@huawei.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Tested-by: Hanjun Guo <guohanjun@huawei.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/284ae9fbadb12f2e3b5a30cd4d037d0e6843a8f4.1713523152.git.robin.murphy@arm.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/acpi')
| -rw-r--r-- | drivers/acpi/arm64/dma.c | 9 | ||||
| -rw-r--r-- | drivers/acpi/arm64/iort.c | 20 |
2 files changed, 13 insertions, 16 deletions
diff --git a/drivers/acpi/arm64/dma.c b/drivers/acpi/arm64/dma.c index 93d796531af3..b98a149f8d50 100644 --- a/drivers/acpi/arm64/dma.c +++ b/drivers/acpi/arm64/dma.c @@ -8,7 +8,6 @@ void acpi_arch_dma_setup(struct device *dev) { int ret; u64 end, mask; - u64 size = 0; const struct bus_dma_region *map = NULL; /* @@ -23,9 +22,9 @@ void acpi_arch_dma_setup(struct device *dev) } if (dev->coherent_dma_mask) - size = max(dev->coherent_dma_mask, dev->coherent_dma_mask + 1); + end = dev->coherent_dma_mask; else - size = 1ULL << 32; + end = (1ULL << 32) - 1; ret = acpi_dma_get_range(dev, &map); if (!ret && map) { @@ -36,18 +35,16 @@ void acpi_arch_dma_setup(struct device *dev) 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); + ret = iort_dma_get_ranges(dev, &end); if (!ret) { /* * Limit coherent and dma mask based on size retrieved from * firmware. */ - 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); diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c index 6496ff5a6ba2..c0b1c2c19444 100644 --- a/drivers/acpi/arm64/iort.c +++ b/drivers/acpi/arm64/iort.c @@ -1367,7 +1367,7 @@ int iort_iommu_configure_id(struct device *dev, const u32 *input_id) { return -ENODEV; } #endif -static int nc_dma_get_range(struct device *dev, u64 *size) +static int nc_dma_get_range(struct device *dev, u64 *limit) { struct acpi_iort_node *node; struct acpi_iort_named_component *ncomp; @@ -1384,13 +1384,13 @@ static int nc_dma_get_range(struct device *dev, u64 *size) return -EINVAL; } - *size = ncomp->memory_address_limit >= 64 ? U64_MAX : - 1ULL<<ncomp->memory_address_limit; + *limit = ncomp->memory_address_limit >= 64 ? U64_MAX : + (1ULL << ncomp->memory_address_limit) - 1; return 0; } -static int rc_dma_get_range(struct device *dev, u64 *size) +static int rc_dma_get_range(struct device *dev, u64 *limit) { struct acpi_iort_node *node; struct acpi_iort_root_complex *rc; @@ -1408,8 +1408,8 @@ static int rc_dma_get_range(struct device *dev, u64 *size) return -EINVAL; } - *size = rc->memory_address_limit >= 64 ? U64_MAX : - 1ULL<<rc->memory_address_limit; + *limit = rc->memory_address_limit >= 64 ? U64_MAX : + (1ULL << rc->memory_address_limit) - 1; return 0; } @@ -1417,16 +1417,16 @@ static int rc_dma_get_range(struct device *dev, u64 *size) /** * iort_dma_get_ranges() - Look up DMA addressing limit for the device * @dev: device to lookup - * @size: DMA range size result pointer + * @limit: DMA limit result pointer * * Return: 0 on success, an error otherwise. */ -int iort_dma_get_ranges(struct device *dev, u64 *size) +int iort_dma_get_ranges(struct device *dev, u64 *limit) { if (dev_is_pci(dev)) - return rc_dma_get_range(dev, size); + return rc_dma_get_range(dev, limit); else - return nc_dma_get_range(dev, size); + return nc_dma_get_range(dev, limit); } static void __init acpi_iort_register_irq(int hwirq, const char *name, |