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Merge branch 'acpi-cca'

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* 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
This commit is contained in:
Rafael J. Wysocki
2015-06-19 01:17:35 +02:00
parent 4def8a360f e144cd045e
commit e193cd15ae
15 changed files with 228 additions and 89 deletions
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35
drivers/acpi/scan.c
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@@ -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)