Hi,
I am writing code in rootnex to implement Intel IOMMU. The register set for
each remapping hardware unit is placed at a 4KB-aligned memory mapped
location. I try to map the register set with an allocated virtual address
space so the CPU can access it.
My mapping function is put in rootnex_attach(), and the function code is,
static caddr_t
iommu_mapin_reg(paddr_t addr, size_t len)
{
uint_t pgoffset;
pgcnt_t npages;
caddr_t cvaddr;
if (len == 0)
return (0);
pgoffset = addr & MMU_PAGEOFFSET;
npages = mmu_btopr(len + pgoffset);
cvaddr = device_arena_alloc(ptob(npages), VM_NOSLEEP);
if (cvaddr == NULL)
return (0);
hat_devload(kas.a_hat, cvaddr, mmu_ptob(npages), mmu_btop(addr),
PROT_READ | PROT_WRITE, HAT_LOAD_LOCK);
cmn_err(CE_CONT, "iommu_mapin_reg: 0x%" PRIx64 ", %d @ 0x%" PRIx64
"\n",
(uint64_t)addr, (uint_t)len, (uint64_t)(uintptr_t)cvaddr);
return (cvaddr + pgoffset);
}
The output of cmn_err() in above function during boot is,
iommu_mapin_reg: 0xfe710000 @ 0xffffff049dd20000
iommu_mapin_reg: 0xfe714000 @ 0xffffff049dd25000
iommu_mapin_reg: 0xfe719000 @ 0xffffff049dd26000
iommu_mapin_reg: 0xfe71a000 @ 0xffffff049dd27000
iommu_mapin_reg: 0xfe718000 @ 0xffffff049dd28000
But when I use mdb to check the mappings:
[2]> 0xfe710000 \K
0xfe710000: 10
[2]> 0xffffff049dd20000 /K
kmdb: failed to read data from target: no mapping for address
0xffffff049dd20000:
Mdb access the physical address gets the right data (which is a remapping
unit version, 0x10), but the access through virtual address fails. I checked
the onnv source tree and got to know that ioapic register address (start
from 0xfee0000) is mapped in the same way. And mdb can access the register
apace through the virtual address (I have verified this in mdb).
PS. I didn't use ddi_regs_map_setup() since what I am writing is not a
driver. Also, ddi_regs_map_setup() will at last be routed to rootnex and map
in the similar way as my mapin function.
Please advice.
Thanks,
-baolu
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