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authorBjorn Helgaas <bhelgaas@google.com>2015-04-10 08:27:18 -0500
committerBjorn Helgaas <bhelgaas@google.com>2015-04-10 08:27:18 -0500
commit5468d5a64bf1e002e5081fa280186d0eba09fa0e (patch)
treea9c1500d4b0cfb9db1f822dc1357c184b0f2f188 /drivers/pci
parent4dd1f57956ada782fd80b1c11c30a9595d6caafc (diff)
parent55db3208f238ee776f1f747734051723d8a3c13e (diff)
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Merge branch 'pci/misc' into next
* pci/misc: PCI: Read capability list as dwords, not bytes PCI: Don't clear ASPM bits when the FADT declares it's unsupported PCI: Clarify policy for vendor IDs in pci.txt PCI/ACPI: Optimize device state transition delays PCI: Export pci_find_host_bridge() for use inside PCI core PCI: Make a shareable UUID for PCI firmware ACPI _DSM PCI: Fix typo in Thunderbolt kernel message
Diffstat (limited to 'drivers/pci')
-rw-r--r--drivers/pci/host-bridge.c6
-rw-r--r--drivers/pci/pci-acpi.c83
-rw-r--r--drivers/pci/pci-label.c11
-rw-r--r--drivers/pci/pci.c11
-rw-r--r--drivers/pci/pci.h2
-rw-r--r--drivers/pci/pcie/aspm.c18
-rw-r--r--drivers/pci/quirks.c2
7 files changed, 98 insertions, 35 deletions
diff --git a/drivers/pci/host-bridge.c b/drivers/pci/host-bridge.c
index 3e5bbf9e8889..5f4a2e04c8d7 100644
--- a/drivers/pci/host-bridge.c
+++ b/drivers/pci/host-bridge.c
@@ -16,7 +16,7 @@ static struct pci_bus *find_pci_root_bus(struct pci_bus *bus)
return bus;
}
-static struct pci_host_bridge *find_pci_host_bridge(struct pci_bus *bus)
+struct pci_host_bridge *pci_find_host_bridge(struct pci_bus *bus)
{
struct pci_bus *root_bus = find_pci_root_bus(bus);
@@ -48,7 +48,7 @@ void pci_set_host_bridge_release(struct pci_host_bridge *bridge,
void pcibios_resource_to_bus(struct pci_bus *bus, struct pci_bus_region *region,
struct resource *res)
{
- struct pci_host_bridge *bridge = find_pci_host_bridge(bus);
+ struct pci_host_bridge *bridge = pci_find_host_bridge(bus);
struct resource_entry *window;
resource_size_t offset = 0;
@@ -73,7 +73,7 @@ static bool region_contains(struct pci_bus_region *region1,
void pcibios_bus_to_resource(struct pci_bus *bus, struct resource *res,
struct pci_bus_region *region)
{
- struct pci_host_bridge *bridge = find_pci_host_bridge(bus);
+ struct pci_host_bridge *bridge = pci_find_host_bridge(bus);
struct resource_entry *window;
resource_size_t offset = 0;
diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
index 489063987325..5eba74716900 100644
--- a/drivers/pci/pci-acpi.c
+++ b/drivers/pci/pci-acpi.c
@@ -18,6 +18,15 @@
#include <linux/pm_qos.h>
#include "pci.h"
+/*
+ * The UUID is defined in the PCI Firmware Specification available here:
+ * https://www.pcisig.com/members/downloads/pcifw_r3_1_13Dec10.pdf
+ */
+const u8 pci_acpi_dsm_uuid[] = {
+ 0xd0, 0x37, 0xc9, 0xe5, 0x53, 0x35, 0x7a, 0x4d,
+ 0x91, 0x17, 0xea, 0x4d, 0x19, 0xc3, 0x43, 0x4d
+};
+
phys_addr_t acpi_pci_root_get_mcfg_addr(acpi_handle handle)
{
acpi_status status = AE_NOT_EXIST;
@@ -528,11 +537,32 @@ static struct pci_platform_pm_ops acpi_pci_platform_pm = {
void acpi_pci_add_bus(struct pci_bus *bus)
{
+ union acpi_object *obj;
+ struct pci_host_bridge *bridge;
+
if (acpi_pci_disabled || !bus->bridge)
return;
acpi_pci_slot_enumerate(bus);
acpiphp_enumerate_slots(bus);
+
+ /*
+ * For a host bridge, check its _DSM for function 8 and if
+ * that is available, mark it in pci_host_bridge.
+ */
+ if (!pci_is_root_bus(bus))
+ return;
+
+ obj = acpi_evaluate_dsm(ACPI_HANDLE(bus->bridge), pci_acpi_dsm_uuid, 3,
+ RESET_DELAY_DSM, NULL);
+ if (!obj)
+ return;
+
+ if (obj->type == ACPI_TYPE_INTEGER && obj->integer.value == 1) {
+ bridge = pci_find_host_bridge(bus);
+ bridge->ignore_reset_delay = 1;
+ }
+ ACPI_FREE(obj);
}
void acpi_pci_remove_bus(struct pci_bus *bus)
@@ -558,6 +588,57 @@ static struct acpi_device *acpi_pci_find_companion(struct device *dev)
check_children);
}
+/**
+ * pci_acpi_optimize_delay - optimize PCI D3 and D3cold delay from ACPI
+ * @pdev: the PCI device whose delay is to be updated
+ * @adev: the companion ACPI device of this PCI device
+ *
+ * Update the d3_delay and d3cold_delay of a PCI device from the ACPI _DSM
+ * control method of either the device itself or the PCI host bridge.
+ *
+ * Function 8, "Reset Delay," applies to the entire hierarchy below a PCI
+ * host bridge. If it returns one, the OS may assume that all devices in
+ * the hierarchy have already completed power-on reset delays.
+ *
+ * Function 9, "Device Readiness Durations," applies only to the object
+ * where it is located. It returns delay durations required after various
+ * events if the device requires less time than the spec requires. Delays
+ * from this function take precedence over the Reset Delay function.
+ *
+ * These _DSM functions are defined by the draft ECN of January 28, 2014,
+ * titled "ACPI additions for FW latency optimizations."
+ */
+static void pci_acpi_optimize_delay(struct pci_dev *pdev,
+ acpi_handle handle)
+{
+ struct pci_host_bridge *bridge = pci_find_host_bridge(pdev->bus);
+ int value;
+ union acpi_object *obj, *elements;
+
+ if (bridge->ignore_reset_delay)
+ pdev->d3cold_delay = 0;
+
+ obj = acpi_evaluate_dsm(handle, pci_acpi_dsm_uuid, 3,
+ FUNCTION_DELAY_DSM, NULL);
+ if (!obj)
+ return;
+
+ if (obj->type == ACPI_TYPE_PACKAGE && obj->package.count == 5) {
+ elements = obj->package.elements;
+ if (elements[0].type == ACPI_TYPE_INTEGER) {
+ value = (int)elements[0].integer.value / 1000;
+ if (value < PCI_PM_D3COLD_WAIT)
+ pdev->d3cold_delay = value;
+ }
+ if (elements[3].type == ACPI_TYPE_INTEGER) {
+ value = (int)elements[3].integer.value / 1000;
+ if (value < PCI_PM_D3_WAIT)
+ pdev->d3_delay = value;
+ }
+ }
+ ACPI_FREE(obj);
+}
+
static void pci_acpi_setup(struct device *dev)
{
struct pci_dev *pci_dev = to_pci_dev(dev);
@@ -566,6 +647,8 @@ static void pci_acpi_setup(struct device *dev)
if (!adev)
return;
+ pci_acpi_optimize_delay(pci_dev, adev->handle);
+
pci_acpi_add_pm_notifier(adev, pci_dev);
if (!adev->wakeup.flags.valid)
return;
diff --git a/drivers/pci/pci-label.c b/drivers/pci/pci-label.c
index 2ab1b47c7651..024b5c179348 100644
--- a/drivers/pci/pci-label.c
+++ b/drivers/pci/pci-label.c
@@ -31,8 +31,6 @@
#include <linux/pci-acpi.h>
#include "pci.h"
-#define DEVICE_LABEL_DSM 0x07
-
#ifdef CONFIG_DMI
enum smbios_attr_enum {
SMBIOS_ATTR_NONE = 0,
@@ -148,11 +146,6 @@ static inline void pci_remove_smbiosname_file(struct pci_dev *pdev)
#endif
#ifdef CONFIG_ACPI
-static const char device_label_dsm_uuid[] = {
- 0xD0, 0x37, 0xC9, 0xE5, 0x53, 0x35, 0x7A, 0x4D,
- 0x91, 0x17, 0xEA, 0x4D, 0x19, 0xC3, 0x43, 0x4D
-};
-
enum acpi_attr_enum {
ACPI_ATTR_LABEL_SHOW,
ACPI_ATTR_INDEX_SHOW,
@@ -179,7 +172,7 @@ static int dsm_get_label(struct device *dev, char *buf,
if (!handle)
return -1;
- obj = acpi_evaluate_dsm(handle, device_label_dsm_uuid, 0x2,
+ obj = acpi_evaluate_dsm(handle, pci_acpi_dsm_uuid, 0x2,
DEVICE_LABEL_DSM, NULL);
if (!obj)
return -1;
@@ -219,7 +212,7 @@ static bool device_has_dsm(struct device *dev)
if (!handle)
return false;
- return !!acpi_check_dsm(handle, device_label_dsm_uuid, 0x2,
+ return !!acpi_check_dsm(handle, pci_acpi_dsm_uuid, 0x2,
1 << DEVICE_LABEL_DSM);
}
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 061fdce8f8e1..acc4b6ef78c4 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -146,19 +146,22 @@ static int __pci_find_next_cap_ttl(struct pci_bus *bus, unsigned int devfn,
u8 pos, int cap, int *ttl)
{
u8 id;
+ u16 ent;
+
+ pci_bus_read_config_byte(bus, devfn, pos, &pos);
while ((*ttl)--) {
- pci_bus_read_config_byte(bus, devfn, pos, &pos);
if (pos < 0x40)
break;
pos &= ~3;
- pci_bus_read_config_byte(bus, devfn, pos + PCI_CAP_LIST_ID,
- &id);
+ pci_bus_read_config_word(bus, devfn, pos, &ent);
+
+ id = ent & 0xff;
if (id == 0xff)
break;
if (id == cap)
return pos;
- pos += PCI_CAP_LIST_NEXT;
+ pos = (ent >> 8);
}
return 0;
}
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 4091f82239cd..d72f849174a4 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -321,4 +321,6 @@ static inline int pci_dev_specific_reset(struct pci_dev *dev, int probe)
}
#endif
+struct pci_host_bridge *pci_find_host_bridge(struct pci_bus *bus);
+
#endif /* DRIVERS_PCI_H */
diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
index 820740a22e94..7d4fcdc512aa 100644
--- a/drivers/pci/pcie/aspm.c
+++ b/drivers/pci/pcie/aspm.c
@@ -782,24 +782,6 @@ void pci_disable_link_state(struct pci_dev *pdev, int state)
}
EXPORT_SYMBOL(pci_disable_link_state);
-void pcie_clear_aspm(struct pci_bus *bus)
-{
- struct pci_dev *child;
-
- if (aspm_force)
- return;
-
- /*
- * Clear any ASPM setup that the firmware has carried out on this bus
- */
- list_for_each_entry(child, &bus->devices, bus_list) {
- __pci_disable_link_state(child, PCIE_LINK_STATE_L0S |
- PCIE_LINK_STATE_L1 |
- PCIE_LINK_STATE_CLKPM,
- false, true);
- }
-}
-
static int pcie_aspm_set_policy(const char *val, struct kernel_param *kp)
{
int i;
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 1bde3972e318..c6dc1dfd25d5 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -3182,7 +3182,7 @@ static void quirk_apple_wait_for_thunderbolt(struct pci_dev *dev)
|| nhi->subsystem_vendor != 0x2222
|| nhi->subsystem_device != 0x1111)
goto out;
- dev_info(&dev->dev, "quirk: wating for thunderbolt to reestablish pci tunnels...\n");
+ dev_info(&dev->dev, "quirk: waiting for thunderbolt to reestablish PCI tunnels...\n");
device_pm_wait_for_dev(&dev->dev, &nhi->dev);
out:
pci_dev_put(nhi);