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ACPI/IORT: Do not blindly trust DMA masks from firmware 

Address issue observed on real world system with suboptimal IORT table
where DMA masks of PCI devices would get set to 0 as result.

iort_dma_setup() would query the root complex'/named component IORT
entry for a DMA mask, and use that over the one the device has been
configured with earlier.

Ideally we want to use the minimum mask of what the IORT contains for
the root complex and what the device was configured with.

Fixes: 5ac65e8c89 ("ACPI/IORT: Support address size limit for root complexes")
Signed-off-by: Moritz Fischer <mdf@kernel.org>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Link: https://lore.kernel.org/r/20210122012419.95010-1-mdf@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Moritz Fischer 2021-01-21 17:24:19 -08:00 committed by Catalin Marinas
parent 519ea6f1c8
commit a1df829ead
1 changed files with 12 additions and 2 deletions
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14
drivers/acpi/arm64/iort.c
View File

@ -1107,6 +1107,11 @@ static int nc_dma_get_range(struct device *dev, u64 *size)
ncomp = (struct acpi_iort_named_component *)node->node_data;
if (!ncomp->memory_address_limit) {
pr_warn(FW_BUG "Named component missing memory address limit\n");
return -EINVAL;
}
*size = ncomp->memory_address_limit >= 64 ? U64_MAX :
1ULL<<ncomp->memory_address_limit;
@ -1126,6 +1131,11 @@ static int rc_dma_get_range(struct device *dev, u64 *size)
rc = (struct acpi_iort_root_complex *)node->node_data;
if (!rc->memory_address_limit) {
pr_warn(FW_BUG "Root complex missing memory address limit\n");
return -EINVAL;
}
*size = rc->memory_address_limit >= 64 ? U64_MAX :
1ULL<<rc->memory_address_limit;
@ -1173,8 +1183,8 @@ void iort_dma_setup(struct device *dev, u64 *dma_addr, u64 *dma_size)
end = dmaaddr + size - 1;
mask = DMA_BIT_MASK(ilog2(end) + 1);
dev->bus_dma_limit = end;
dev->coherent_dma_mask = mask;
*dev->dma_mask = mask;
dev->coherent_dma_mask = min(dev->coherent_dma_mask, mask);
*dev->dma_mask = min(*dev->dma_mask, mask);
}
*dma_addr = dmaaddr;