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    SubjectRe: [Intel IOMMU 01/10] DMAR detection and parsing logic
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    On Tue, 2007-06-19 at 14:37 -0700, Keshavamurthy, Anil S wrote:
    > plain text document attachment (dmar_detection.patch)

    > +/**
    > + * parse_dmar_table - parses the DMA reporting table
    > + */
    > +static int __init
    > +parse_dmar_table(void)
    > +{
    > + struct acpi_table_dmar *dmar;
    > + struct acpi_dmar_header *entry_header;
    > + int ret = 0;
    > +
    > + dmar = (struct acpi_table_dmar *)dmar_tbl;
    > +
    > + if (!dmar->width) {
    ^^^^^^^^^^^^^^^^^^^

    That goes *splat* on my opteron box.

    > + printk (KERN_WARNING PREFIX "Zero: Invalid DMAR haw\n");
    > + return -EINVAL;
    > + }
    > +
    > + printk (KERN_INFO PREFIX "Host address width %d\n",
    > + dmar->width + 1);
    > +
    > + entry_header = (struct acpi_dmar_header *)(dmar + 1);
    > + while (((unsigned long)entry_header) <
    > + (((unsigned long)dmar) + dmar_tbl->length)) {
    > + dmar_table_print_dmar_entry(entry_header);
    > +
    > + switch (entry_header->type) {
    > + case ACPI_DMAR_TYPE_HARDWARE_UNIT:
    > + ret = dmar_parse_one_drhd(entry_header);
    > + break;
    > + case ACPI_DMAR_TYPE_RESERVED_MEMORY:
    > + ret = dmar_parse_one_rmrr(entry_header);
    > + break;
    > + default:
    > + printk(KERN_WARNING PREFIX
    > + "Unknown DMAR structure type\n");
    > + ret = 0; /* for forward compatibility */
    > + break;
    > + }
    > + if (ret)
    > + break;
    > +
    > + entry_header = ((void *)entry_header + entry_header->length);
    > + }
    > + return ret;
    > +}
    > +

    -
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