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author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2015-06-19 01:17:35 +0200 |
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committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2015-06-19 01:17:35 +0200 |
commit | e193cd15ae98817ad82cc8bad61a200ac561e98c (patch) | |
tree | a4b645de8fe35f75e3d9459461bb89e8ffc41979 /drivers/acpi | |
parent | Merge branch 'acpi-video' (diff) | |
parent | ufs: fix TRUE and FALSE re-define build error (diff) | |
download | linux-dev-e193cd15ae98817ad82cc8bad61a200ac561e98c.tar.xz linux-dev-e193cd15ae98817ad82cc8bad61a200ac561e98c.zip |
Merge branch 'acpi-cca'
* acpi-cca:
ufs: fix TRUE and FALSE re-define build error
megaraid_sas: fix TRUE and FALSE re-define build error
amd-xgbe: Unify coherency checking logic with device_dma_is_coherent()
crypto: ccp - Unify coherency checking logic with device_dma_is_coherent()
device property: Introduces device_dma_is_coherent()
arm64 : Introduce support for ACPI _CCA object
ACPI / scan: Parse _CCA and setup device coherency
Diffstat (limited to 'drivers/acpi')
-rw-r--r-- | drivers/acpi/Kconfig | 3 | ||||
-rw-r--r-- | drivers/acpi/acpi_platform.c | 2 | ||||
-rw-r--r-- | drivers/acpi/glue.c | 5 | ||||
-rw-r--r-- | drivers/acpi/scan.c | 35 |
4 files changed, 44 insertions, 1 deletions
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig index 16da18597def..35da507411a0 100644 --- a/drivers/acpi/Kconfig +++ b/drivers/acpi/Kconfig @@ -54,6 +54,9 @@ config ACPI_GENERIC_GSI config ACPI_SYSTEM_POWER_STATES_SUPPORT bool +config ACPI_CCA_REQUIRED + bool + config ACPI_SLEEP bool depends on SUSPEND || HIBERNATION diff --git a/drivers/acpi/acpi_platform.c b/drivers/acpi/acpi_platform.c index 4bf75597f732..06a67d5f2846 100644 --- a/drivers/acpi/acpi_platform.c +++ b/drivers/acpi/acpi_platform.c @@ -103,7 +103,7 @@ struct platform_device *acpi_create_platform_device(struct acpi_device *adev) pdevinfo.res = resources; pdevinfo.num_res = count; pdevinfo.fwnode = acpi_fwnode_handle(adev); - pdevinfo.dma_mask = DMA_BIT_MASK(32); + pdevinfo.dma_mask = acpi_check_dma(adev, NULL) ? DMA_BIT_MASK(32) : 0; pdev = platform_device_register_full(&pdevinfo); if (IS_ERR(pdev)) dev_err(&adev->dev, "platform device creation failed: %ld\n", diff --git a/drivers/acpi/glue.c b/drivers/acpi/glue.c index 39c485b0c25c..b9657af751d1 100644 --- a/drivers/acpi/glue.c +++ b/drivers/acpi/glue.c @@ -13,6 +13,7 @@ #include <linux/slab.h> #include <linux/rwsem.h> #include <linux/acpi.h> +#include <linux/dma-mapping.h> #include "internal.h" @@ -167,6 +168,7 @@ int acpi_bind_one(struct device *dev, struct acpi_device *acpi_dev) struct list_head *physnode_list; unsigned int node_id; int retval = -EINVAL; + bool coherent; if (has_acpi_companion(dev)) { if (acpi_dev) { @@ -223,6 +225,9 @@ int acpi_bind_one(struct device *dev, struct acpi_device *acpi_dev) if (!has_acpi_companion(dev)) ACPI_COMPANION_SET(dev, acpi_dev); + if (acpi_check_dma(acpi_dev, &coherent)) + arch_setup_dma_ops(dev, 0, 0, NULL, coherent); + acpi_physnode_link_name(physical_node_name, node_id); retval = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj, physical_node_name); diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index 4bbc8f89257f..2649a068671d 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -11,6 +11,7 @@ #include <linux/kthread.h> #include <linux/dmi.h> #include <linux/nls.h> +#include <linux/dma-mapping.h> #include <asm/pgtable.h> @@ -2153,6 +2154,39 @@ void acpi_free_pnp_ids(struct acpi_device_pnp *pnp) kfree(pnp->unique_id); } +static void acpi_init_coherency(struct acpi_device *adev) +{ + unsigned long long cca = 0; + acpi_status status; + struct acpi_device *parent = adev->parent; + + if (parent && parent->flags.cca_seen) { + /* + * From ACPI spec, OSPM will ignore _CCA if an ancestor + * already saw one. + */ + adev->flags.cca_seen = 1; + cca = parent->flags.coherent_dma; + } else { + status = acpi_evaluate_integer(adev->handle, "_CCA", + NULL, &cca); + if (ACPI_SUCCESS(status)) + adev->flags.cca_seen = 1; + else if (!IS_ENABLED(CONFIG_ACPI_CCA_REQUIRED)) + /* + * If architecture does not specify that _CCA is + * required for DMA-able devices (e.g. x86), + * we default to _CCA=1. + */ + cca = 1; + else + acpi_handle_debug(adev->handle, + "ACPI device is missing _CCA.\n"); + } + + adev->flags.coherent_dma = cca; +} + void acpi_init_device_object(struct acpi_device *device, acpi_handle handle, int type, unsigned long long sta) { @@ -2171,6 +2205,7 @@ void acpi_init_device_object(struct acpi_device *device, acpi_handle handle, device->flags.visited = false; device_initialize(&device->dev); dev_set_uevent_suppress(&device->dev, true); + acpi_init_coherency(device); } void acpi_device_add_finalize(struct acpi_device *device) |