On Fri, Sep 09, 2016 at 11:09:40AM +0800, Dennis Chen wrote:
> Hi Tomasz,
>
> On Tue, Sep 06, 2016 at 11:08:51AM +0200, Tomasz Nowicki wrote:
> [...]
> > +static int iort_id_map(struct acpi_iort_id_mapping *map, u8 type, u32 rid_in,
> > + u32 *rid_out)
> > +{
> > + /* Single mapping does not care for input id */
> > + if (map->flags & ACPI_IORT_ID_SINGLE_MAPPING) {
> > + if (type == ACPI_IORT_NODE_NAMED_COMPONENT ||
> > + type == ACPI_IORT_NODE_PCI_ROOT_COMPLEX) {
> > + *rid_out = map->output_base;
> > + return 0;
> > + }
> > +
> > + pr_warn(FW_BUG "[map %p] SINGLE MAPPING flag not allowed for node type %d, skipping ID map\n",
> > + map, type);
> > + return -ENXIO;
> > + }
> > +
> > + if (rid_in < map->input_base ||
> > + (rid_in >= map->input_base + map->id_count))
> > + return -ENXIO;
> > +
> > + *rid_out = map->output_base + (rid_in - map->input_base);
> > + return 0;
> > +}
> > +
> > +static struct acpi_iort_node *iort_node_map_rid(struct acpi_iort_node *node,
> > + u32 rid_in, u32 *rid_out,
> > + u8 type)
> > +{
> > + u32 rid = rid_in;
> > +
> > + /* Parse the ID mapping tree to find specified node type */
> > + while (node) {
> > + struct acpi_iort_id_mapping *map;
> > + int i;
> > +
> > + if (node->type == type) {
> > + if (rid_out)
> > + *rid_out = rid;
> > + return node;
> > + }
> > +
> > + if (!node->mapping_offset || !node->mapping_count)
> > + goto fail_map;
> If node->mapping_count is zero, then node->mapping_offset must be zero. A firmware bug
> otherwise?
So ? This function is there to map RIDs, not to validate all firmware
permutations and current code behaviour seems correct to me.
> > +
> > + map = ACPI_ADD_PTR(struct acpi_iort_id_mapping, node,
> > + node->mapping_offset);
> > +
> > + /* Firmware bug! */
> > + if (!map->output_reference) {
> > + pr_err(FW_BUG "[node %p type %d] ID map has NULL parent reference\n",
> > + node, node->type);
> > + goto fail_map;
> > + }
> > +
> > + /* Do the RID translation */
> > + for (i = 0; i < node->mapping_count; i++, map++) {
> > + if (!iort_id_map(map, node->type, rid, &rid))
> > + break;
> > + }
> >
> Just curious about if there is kind of possibility that we can get
> some reduplicated DeviceIDs with a deliberate ID mapping design in FW
> for the SMMU/RC node. For instance, for a system with 2 PCIe RCs both
> behind an individual SMMU device, how to make sure the StreamID mapped
> is unique across the entire system, the same for DeviceID mapped.
> Anyway, this is my personal confusion, maybe it's not a problem at all
> for current design ;-)
Are you asking if FW can contain bugs ? Yes it can. I do not see
how your comment is related to this patch though.
Lorenzo
> Thanks,
> Dennis
> > +
> > + if (i == node->mapping_count)
> > + goto fail_map;
> > +
> > + node = ACPI_ADD_PTR(struct acpi_iort_node, iort_table,
> > + map->output_reference);
> > + }
> > +
> > +fail_map:
> > + /* Map input RID to output RID unchanged on mapping failure*/
> > + if (rid_out)
> > + *rid_out = rid_in;
> > +
> > + return NULL;
> > +}
> > +
> > +static struct acpi_iort_node *iort_find_dev_node(struct device *dev)
> > +{
> > + struct pci_bus *pbus;
> > +
> > + if (!dev_is_pci(dev))
> > + return iort_scan_node(ACPI_IORT_NODE_NAMED_COMPONENT,
> > + iort_match_node_callback, dev);
> > +
> > + /* Find a PCI root bus */
> > + pbus = to_pci_dev(dev)->bus;
> > + while (!pci_is_root_bus(pbus))
> > + pbus = pbus->parent;
> > +
> > + return iort_scan_node(ACPI_IORT_NODE_PCI_ROOT_COMPLEX,
> > + iort_match_node_callback, &pbus->dev);
> > +}
> > +
> > +void __init acpi_iort_init(void)
> > +{
> > + acpi_status status;
> > +
> > + status = acpi_get_table(ACPI_SIG_IORT, 0, &iort_table);
> > + if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
> > + const char *msg = acpi_format_exception(status);
> > + pr_err("Failed to get table, %s\n", msg);
> > + }
> > +}
> > diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c
> > index 85b7d07..e56e643 100644
> > --- a/drivers/acpi/bus.c
> > +++ b/drivers/acpi/bus.c
> > @@ -36,6 +36,7 @@
> > #ifdef CONFIG_X86
> > #include <asm/mpspec.h>
> > #endif
> > +#include <linux/acpi_iort.h>
> > #include <linux/pci.h>
> > #include <acpi/apei.h>
> > #include <linux/dmi.h>
> > @@ -1186,6 +1187,7 @@ static int __init acpi_init(void)
> > }
> >
> > pci_mmcfg_late_init();
> > + acpi_iort_init();
> > acpi_scan_init();
> > acpi_ec_init();
> > acpi_debugfs_init();
> > diff --git a/include/linux/acpi_iort.h b/include/linux/acpi_iort.h
> > new file mode 100644
> > index 0000000..fcacaf7
> > --- /dev/null
> > +++ b/include/linux/acpi_iort.h
> > @@ -0,0 +1,30 @@
> > +/*
> > + * Copyright (C) 2016, Semihalf
> > + * Author: Tomasz Nowicki <tn@xxxxxxxxxxxx>
> > + *
> > + * This program is free software; you can redistribute it and/or modify it
> > + * under the terms and conditions of the GNU General Public License,
> > + * version 2, as published by the Free Software Foundation.
> > + *
> > + * This program is distributed in the hope it will be useful, but WITHOUT
> > + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> > + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
> > + * more details.
> > + *
> > + * You should have received a copy of the GNU General Public License along with
> > + * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
> > + * Place - Suite 330, Boston, MA 02111-1307 USA.
> > + */
> > +
> > +#ifndef __ACPI_IORT_H__
> > +#define __ACPI_IORT_H__
> > +
> > +#include <linux/acpi.h>
> > +
> > +#ifdef CONFIG_ACPI_IORT
> > +void acpi_iort_init(void);
> > +#else
> > +static inline void acpi_iort_init(void) { }
> > +#endif
> > +
> > +#endif /* __ACPI_IORT_H__ */
> > --
> > 1.9.1
> >
> > --
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