linux-kernel - [PATCH] PCI: ACPI: IA64: fix IO port generic range check

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Date:	Mon,  1 Feb 2016 10:25:57 +0000
From:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:	linux-pci@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Hanjun Guo <hanjun.guo@...aro.org>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	Tony Luck <tony.luck@...el.com>,
	Tomasz Nowicki <tn@...ihalf.com>,
	Mark Salter <msalter@...hat.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>
Subject: [PATCH] PCI: ACPI: IA64: fix IO port generic range check

The [0 - 64k] ACPI PCI IO port resource boundary check in:

acpi_dev_ioresource_flags()

is currently applied blindly in the ACPI resource parsing to all
architectures, but only x86 suffers from that IO space limitation.
The check in generic ACPI code leaves other arches (ie IA64) IO space
broken (ie kernel can't claim IO resources since the host bridge
IO resource is disabled and discarded by ACPI core code, eg log on
IA64):

pci 0000:00:03.0: [1002:515e] type 00 class 0x030000

pci 0000:00:03.0: reg 0x10: [mem 0x80000000-0x87ffffff pref]

pci 0000:00:03.0: reg 0x14: [io  0x1000-0x10ff]

pci 0000:00:03.0: reg 0x18: [mem 0x88020000-0x8802ffff]

pci 0000:00:03.0: reg 0x30: [mem 0x88000000-0x8801ffff pref]

pci 0000:00:03.0: supports D1 D2

pci 0000:00:03.0: can't claim BAR 1 [io  0x1000-0x10ff]: no compatible
bridge window

For this reason, the IO port resources boundaries check in generic ACPI
parsing code should be moved to x86 arch code so that more arches (ie
ARM64) can benefit from the generic ACPI resources parsing interface
without incurring in unexpected resource filtering, fixing at the same
time current breakage on IA64.

This patch moves the IO ports boundary [0 - 64k] check to x86 arch code
code that validates the PCI host bridge resources.

Fixes: 3772aea7d6f3 ("ia64/PCI/ACPI: Use common ACPI resource parsing
interface for host bridge")
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: Hanjun Guo <hanjun.guo@...aro.org>
Cc: Jiang Liu <jiang.liu@...ux.intel.com>
Cc: Tony Luck <tony.luck@...el.com>
Cc: Tomasz Nowicki <tn@...ihalf.com>
Cc: Mark Salter <msalter@...hat.com>
Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
---
 arch/x86/pci/acpi.c     | 18 +++++++++++++-----
 drivers/acpi/resource.c |  3 ---
 2 files changed, 13 insertions(+), 8 deletions(-)

diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
index 3cd6983..e20dbe5 100644
--- a/arch/x86/pci/acpi.c
+++ b/arch/x86/pci/acpi.c
@@ -275,11 +275,14 @@ static void pci_acpi_root_release_info(struct acpi_pci_root_info *ci)
  *     to access PCI configuration space.
  *
  * So explicitly filter out PCI CFG IO ports[0xCF8-0xCFF].
+ *
+ * Furthermore, IO ports address space is limited to 16k on x86,
+ * any IO resource exceeding the boundary must therefore be discarded.
  */
-static bool resource_is_pcicfg_ioport(struct resource *res)
+static bool ioport_valid(struct resource *res)
 {
-	return (res->flags & IORESOURCE_IO) &&
-		res->start == 0xCF8 && res->end == 0xCFF;
+	return !(res->start == 0xCF8 && res->end == 0xCFF) &&
+	       !(res->end >= 0x10003);
 }
 
 static int pci_acpi_root_prepare_resources(struct acpi_pci_root_info *ci)
@@ -287,13 +290,18 @@ static int pci_acpi_root_prepare_resources(struct acpi_pci_root_info *ci)
 	struct acpi_device *device = ci->bridge;
 	int busnum = ci->root->secondary.start;
 	struct resource_entry *entry, *tmp;
+	struct resource *res;
 	int status;
 
 	status = acpi_pci_probe_root_resources(ci);
 	if (pci_use_crs) {
-		resource_list_for_each_entry_safe(entry, tmp, &ci->resources)
-			if (resource_is_pcicfg_ioport(entry->res))
+		resource_list_for_each_entry_safe(entry, tmp, &ci->resources) {
+			res = entry->res;
+
+			if (res->flags & IORESOURCE_IO && !ioport_valid(res))
 				resource_list_destroy_entry(entry);
+		}
+
 		return status;
 	}
 
diff --git a/drivers/acpi/resource.c b/drivers/acpi/resource.c
index d02fd53..c112e1d 100644
--- a/drivers/acpi/resource.c
+++ b/drivers/acpi/resource.c
@@ -127,9 +127,6 @@ static void acpi_dev_ioresource_flags(struct resource *res, u64 len,
 	if (!acpi_dev_resource_len_valid(res->start, res->end, len, true))
 		res->flags |= IORESOURCE_DISABLED | IORESOURCE_UNSET;
 
-	if (res->end >= 0x10003)
-		res->flags |= IORESOURCE_DISABLED | IORESOURCE_UNSET;
-
 	if (io_decode == ACPI_DECODE_16)
 		res->flags |= IORESOURCE_IO_16BIT_ADDR;
 	if (translation_type == ACPI_SPARSE_TRANSLATION)
-- 
2.5.1