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author | Linus Torvalds <torvalds@linux-foundation.org> | 2015-11-12 19:50:33 (GMT) |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-11-12 19:50:33 (GMT) |
commit | be23c9d20b341a58ad7107f9e9aa5735cea3da13 (patch) | |
tree | da5e5ede73ccba5e3464821fb0cfb67c027f796a /drivers/pci/probe.c | |
parent | 5d50ac70fe98518dbf620bfba8184254663125eb (diff) | |
parent | f57ab32a843690fe7431ebb3a2f461e689a2e3c7 (diff) | |
download | linux-be23c9d20b341a58ad7107f9e9aa5735cea3da13.tar.xz |
Merge tag 'pm+acpi-4.4-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull more power management and ACPI updates from Rafael Wysocki:
"The only new feature in this batch is support for the ACPI _CCA device
configuration object, which it a pre-requisite for future ACPI PCI
support on ARM64, but should not affect the other architectures.
The rest is fixes and cleanups, mostly in cpufreq (including
intel_pstate), the Operating Performace Points (OPP) framework and
tools (cpupower and turbostat).
Specifics:
- Support for the ACPI _CCA configuration object intended to tell the
OS whether or not a bus master device supports hardware managed
cache coherency and a new set of functions to allow drivers to
check the cache coherency support for devices in a platform
firmware interface agnostic way (Suravee Suthikulpanit, Jeremy
Linton).
- ACPI backlight quirks for ESPRIMO Mobile M9410 and Dell XPS L421X
(Aaron Lu, Hans de Goede).
- Fixes for the arm_big_little and s5pv210-cpufreq cpufreq drivers
(Jon Medhurst, Nicolas Pitre).
- kfree()-related fixup for the recently introduced CPPC cpufreq
frontend (Markus Elfring).
- intel_pstate fix reducing kernel log noise on systems where
P-states are managed by hardware (Prarit Bhargava).
- intel_pstate maintainers information update (Srinivas Pandruvada).
- cpufreq core optimization related to the handling of delayed work
items used by governors (Viresh Kumar).
- Locking fixes and cleanups of the Operating Performance Points
(OPP) framework (Viresh Kumar).
- Generic power domains framework cleanups (Lina Iyer).
- cpupower tool updates (Jacob Tanenbaum, Sriram Raghunathan, Thomas
Renninger).
- turbostat tool updates (Len Brown)"
* tag 'pm+acpi-4.4-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (32 commits)
PCI: ACPI: Add support for PCI device DMA coherency
PCI: OF: Move of_pci_dma_configure() to pci_dma_configure()
of/pci: Fix pci_get_host_bridge_device leak
device property: ACPI: Remove unused DMA APIs
device property: ACPI: Make use of the new DMA Attribute APIs
device property: Adding DMA Attribute APIs for Generic Devices
ACPI: Adding DMA Attribute APIs for ACPI Device
device property: Introducing enum dev_dma_attr
ACPI: Honor ACPI _CCA attribute setting
cpufreq: CPPC: Delete an unnecessary check before the function call kfree()
PM / OPP: Add opp_rcu_lockdep_assert() to _find_device_opp()
PM / OPP: Hold dev_opp_list_lock for writers
PM / OPP: Protect updates to list_dev with mutex
PM / OPP: Propagate error properly from dev_pm_opp_set_sharing_cpus()
cpufreq: s5pv210-cpufreq: fix wrong do_div() usage
MAINTAINERS: update for intel P-state driver
Creating a common structure initialization pattern for struct option
cpupower: Enable disabled Cstates if they are below max latency
cpupower: Remove debug message when using cpupower idle-set -D switch
cpupower: cpupower monitor reports uninitialized values for offline cpus
...
Diffstat (limited to 'drivers/pci/probe.c')
-rw-r--r-- | drivers/pci/probe.c | 32 |
1 files changed, 31 insertions, 1 deletions
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index f53b8e8..e735c72 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -6,6 +6,7 @@ #include <linux/delay.h> #include <linux/init.h> #include <linux/pci.h> +#include <linux/of_device.h> #include <linux/of_pci.h> #include <linux/pci_hotplug.h> #include <linux/slab.h> @@ -13,6 +14,7 @@ #include <linux/cpumask.h> #include <linux/pci-aspm.h> #include <linux/aer.h> +#include <linux/acpi.h> #include <asm-generic/pci-bridge.h> #include "pci.h" @@ -1672,6 +1674,34 @@ static void pci_set_msi_domain(struct pci_dev *dev) dev_set_msi_domain(&dev->dev, d); } +/** + * pci_dma_configure - Setup DMA configuration + * @dev: ptr to pci_dev struct of the PCI device + * + * Function to update PCI devices's DMA configuration using the same + * info from the OF node or ACPI node of host bridge's parent (if any). + */ +static void pci_dma_configure(struct pci_dev *dev) +{ + struct device *bridge = pci_get_host_bridge_device(dev); + + if (IS_ENABLED(CONFIG_OF) && dev->dev.of_node) { + if (bridge->parent) + of_dma_configure(&dev->dev, bridge->parent->of_node); + } else if (has_acpi_companion(bridge)) { + struct acpi_device *adev = to_acpi_device_node(bridge->fwnode); + enum dev_dma_attr attr = acpi_get_dma_attr(adev); + + if (attr == DEV_DMA_NOT_SUPPORTED) + dev_warn(&dev->dev, "DMA not supported.\n"); + else + arch_setup_dma_ops(&dev->dev, 0, 0, NULL, + attr == DEV_DMA_COHERENT); + } + + pci_put_host_bridge_device(bridge); +} + void pci_device_add(struct pci_dev *dev, struct pci_bus *bus) { int ret; @@ -1685,7 +1715,7 @@ void pci_device_add(struct pci_dev *dev, struct pci_bus *bus) dev->dev.dma_mask = &dev->dma_mask; dev->dev.dma_parms = &dev->dma_parms; dev->dev.coherent_dma_mask = 0xffffffffull; - of_pci_dma_configure(dev); + pci_dma_configure(dev); pci_set_dma_max_seg_size(dev, 65536); pci_set_dma_seg_boundary(dev, 0xffffffff); |