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 rka@sysgo.com ---
Please disregard the previous patch, I've send a wrong version that does not even compile.
drivers/ata/ahci.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-)
diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c index 9a08575053..fd4df60a17 100644 --- a/drivers/ata/ahci.c +++ b/drivers/ata/ahci.c @@ -50,6 +50,8 @@ struct ahci_uc_priv *probe_ent = NULL; #define WAIT_MS_FLUSH 5000 #define WAIT_MS_LINKUP 200
+#define AHCI_CAP_S64A (1u << 31) + __weak void __iomem *ahci_port_base(void __iomem *base, u32 port) { return base + 0x100 + (port * 0x80); @@ -503,9 +505,15 @@ 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)