Hi Rafael, On Thu, Aug 18, 2016 at 08:25:20AM +0200, Tomasz Nowicki wrote: > On 12.08.2016 18:33, Lorenzo Pieralisi wrote: > >Hi Tomasz, > > > >On Thu, Aug 11, 2016 at 12:06:31PM +0200, Tomasz Nowicki wrote: > >>IORT shows representation of IO topology for ARM based systems. > >>It describes how various components are connected together on > >>parent-child basis e.g. PCI RC -> SMMU -> ITS. Also see IORT spec. > >>http://infocenter.arm.com/help/topic/com.arm.doc.den0049b/DEN0049B_IO_Remapping_Table.pdf > >> > >>Initial support allows to detect IORT table presence and save its > >>root pointer obtained through acpi_get_table(). The pointer validity > >>depends on acpi_gbl_permanent_mmap because if acpi_gbl_permanent_mmap > >>is not set while using IORT nodes we would dereference unmapped pointers. > >> > >>For the aforementioned reason call iort_table_detect() from acpi_init() > >>which guarantees acpi_gbl_permanent_mmap to be set at that point. > > > >We still need to get Rafael ACK on this, keeping in mind that the > >eg code parsing DMAR table relies on the same assumption. > > Exactly. > > Rafael, can you please have a look ? A gentle reminder, this patch is gating this series and requires your review, please let us know what you think. Thank you, Lorenzo > > > > >[...] > > > >>diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig > >>index 445ce28..6cef2d1 100644 > >>--- a/drivers/acpi/Kconfig > >>+++ b/drivers/acpi/Kconfig > >>@@ -521,4 +521,9 @@ config ACPI_CONFIGFS > >> userspace. The configurable ACPI groups will be visible under > >> /config/acpi, assuming configfs is mounted under /config. > >> > >>+if ARM64 > >>+source "drivers/acpi/arm64/Kconfig" > >>+ > > > >Just curious: Why do you need a space ? > > No good reason, it will disappear for next version. > > > > >>+endif > >>+ > >> endif # ACPI > >>diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile > >>index 5ae9d85..e5ada78 100644 > >>--- a/drivers/acpi/Makefile > >>+++ b/drivers/acpi/Makefile > >>@@ -105,3 +105,5 @@ obj-$(CONFIG_ACPI_CONFIGFS) += acpi_configfs.o > >> > >> video-objs += acpi_video.o video_detect.o > >> obj-y += dptf/ > >>+ > >>+obj-$(CONFIG_ARM64) += arm64/ > >>diff --git a/drivers/acpi/arm64/Kconfig b/drivers/acpi/arm64/Kconfig > >>new file mode 100644 > >>index 0000000..fc818dc > >>--- /dev/null > >>+++ b/drivers/acpi/arm64/Kconfig > >>@@ -0,0 +1,6 @@ > >>+# > >>+# ACPI Configuration for ARM64 > >>+# > >>+ > >>+config IORT_TABLE > >>+ bool > >>diff --git a/drivers/acpi/arm64/Makefile b/drivers/acpi/arm64/Makefile > >>new file mode 100644 > >>index 0000000..d01be6f > >>--- /dev/null > >>+++ b/drivers/acpi/arm64/Makefile > >>@@ -0,0 +1 @@ > >>+obj-$(CONFIG_IORT_TABLE) += iort.o > >>diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c > >>new file mode 100644 > >>index 0000000..f89056e > >>--- /dev/null > >>+++ b/drivers/acpi/arm64/iort.c > >>@@ -0,0 +1,218 @@ > >>+/* > >>+ * 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. > >>+ * > >>+ * This file implements early detection/parsing of I/O mapping > >>+ * reported to OS through firmware via I/O Remapping Table (IORT) > >>+ * IORT document number: ARM DEN 0049A > >>+ */ > >>+ > >>+#define pr_fmt(fmt) "ACPI: IORT: " fmt > >>+ > >>+#include <linux/iort.h> > >>+#include <linux/kernel.h> > >>+#include <linux/pci.h> > >>+ > >>+typedef acpi_status (*iort_find_node_callback) > >>+ (struct acpi_iort_node *node, void *context); > >>+ > >>+/* Root pointer to the mapped IORT table */ > >>+static struct acpi_table_header *iort_table; > > > >See above. > > > >[...] > > > >>+void __init iort_table_detect(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..55a84da 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/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(); > >>+ iort_table_detect(); > > > >That's another bit we have to make sure Rafael is ok with, given > >that IORT is ARM64 specific (but we stub it out if it is not > >configured). > > > >Having said that: > > > >Reviewed-by: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx> > > Thanks for your time. > > Tomasz > -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
