Allow 64-bit DMA on AHCI. If not supported by the host controller, at
least print a message and fail.
Signed-off-by: Roman Kapl <r...@sysgo.com>
---
drivers/ata/ahci.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index 9a08575053..02007ad4bd 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -503,9 +503,15 @@ static int ahci_fill_sg(struct ahci_uc_priv *uc_priv, u8
port,
}
for (i = 0; i < sg_count; i++) {
- ahci_sg->addr =
- cpu_to_le32((unsigned long) buf + i * MAX_DATA_BYTE_COUNT);
- ahci_sg->addr_hi = 0;
+ /* We assume virt=phys */
+ phys_addr_t pa = (unsigned long)buf + i * MAX_DATA_BYTE_COUNT;
+
+ ahci_sg->addr = cpu_to_le32(pa & U32_MAX);
+ ahci_sg->addr_hi = cpu_to_le32((pa >> 32) & U32_MAX);
+ if (ahci_sg->addr_hi && !(uc_priv->cap & AHCI_CAP_S64A)) {
+ printf("Error: DMA address too high\n");
+ return -1;
+ }
ahci_sg->flags_size = cpu_to_le32(0x3fffff &
(buf_len < MAX_DATA_BYTE_COUNT
? (buf_len - 1)
--
2.22.0
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