* [RFC 3/4] irqchip, gicv3-its: Introduce ACPI generic quirk framework
[not found] <5886266C.3070506@huawei.com>
@ 2017-01-24 13:50 ` Shameerali Kolothum Thodi
0 siblings, 0 replies; only message in thread
From: Shameerali Kolothum Thodi @ 2017-01-24 13:50 UTC (permalink / raw)
To: marc.zyngier, mark.rutland, will.deacon
Cc: linux-arm-kernel, linuxarm, linux-kernel, devicetree, john.garry,
guohanjun
The current quirk mechanism is based on the IIDR register.
This introduces a ACPI MADT OEM information based erratum
support for platforms on which the IIDR registers are not
properly populated.
Signed-off-by: shameer <shameerali.kolothum.thodi@huawei.com>
---
drivers/irqchip/irq-gic-v3-its.c | 62 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 62 insertions(+)
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index 0a326f6..9fa12b7 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -1858,6 +1858,66 @@ static int __init its_of_probe(struct device_node *node)
#ifdef CONFIG_ACPI
+struct acpi_madt_its_quirks {
+ char oem_id[ACPI_OEM_ID_SIZE+1];
+ char oem_table_id[ACPI_OEM_TABLE_ID_SIZE+1];
+ u32 oem_revision;
+ u32 its_id;
+ const char *erratum;
+};
+
+/*Upadate as per the board OEM ID and TABLE ID*/
+struct acpi_madt_its_quirks acpi_its_quirks[] __initdata = {
+
+};
+
+static void acpi_its_enable_erratum(const char *erratum)
+{
+ const struct gic_quirk *quirks = its_quirks;
+ int i = 0;
+
+ for (; quirks->desc; quirks++) {
+ if ((quirks->erratum) && (!strcmp(quirks->erratum, erratum)))
+ erratum_workarounds[i++] = quirks;
+ }
+}
+
+static void __init acpi_its_oem_check(char *oem_id, char *oem_table_id,
+ u32 oem_revision)
+{
+ struct acpi_madt_its_quirks *quirks = acpi_its_quirks;
+
+ for (; quirks->erratum; quirks++) {
+ if (!memcmp(quirks->oem_id, oem_id, ACPI_OEM_ID_SIZE) &&
+ !memcmp(quirks->oem_table_id, oem_table_id,
+ ACPI_OEM_TABLE_ID_SIZE) &&
+ quirks->oem_revision == oem_revision) {
+ acpi_its_enable_erratum(quirks->erratum);
+ }
+ }
+}
+
+static int __init acpi_parse_madt(struct acpi_table_header *madt_table)
+{
+ struct acpi_table_madt *table;
+
+ table = (struct acpi_table_madt *)madt_table;
+ acpi_its_oem_check(table->header.oem_id,
+ table->header.oem_table_id, table->header.oem_revision);
+
+ return 0;
+}
+
+void __init its_acpi_quirks_enable(u32 its_id)
+{
+ struct acpi_madt_its_quirks *quirks = acpi_its_quirks;
+
+ for (; quirks->erratum; quirks++) {
+ if (quirks->its_id == its_id)
+ acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt);
+ }
+}
+
#define ACPI_GICV3_ITS_MEM_SIZE (SZ_128K)
static int __init gic_acpi_parse_madt_its(struct acpi_subtable_header *header,
@@ -1888,6 +1948,8 @@ static int __init gic_acpi_parse_madt_its(struct acpi_subtable_header *header,
goto dom_err;
}
+ its_acpi_quirks_enable(its_entry->translation_id);
+
err = its_probe_one(&res, dom_handle, NUMA_NO_NODE);
if (!err)
return 0;
--
1.9.1
.
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