From b0063aad5dd86308c9b9c433ac8f3ab5b49aab1b Mon Sep 17 00:00:00 2001 From: Thomas Petazzoni Date: Tue, 13 May 2014 18:04:30 +0200 Subject: [PATCH] ARM: mvebu: use hardware I/O coherency also for PCI devices Since the beginning of the introduction of hardware I/O coherency support for Armada 370 and Armada XP, the special DMA operations should have applied to all DMA capable devices. Unfortunately, while the original code properly took into account platform devices, it didn't take into account PCI devices, which can also be DMA masters. This commit fixes that by registering a bus notifier on pci_bus_type, to register our custom DMA operations, like is already done for platform devices. While doing this, we also rename mvebu_hwcc_platform_notifier() to mvebu_hwcc_notifier() and mvebu_hwcc_platform_nb to mvebu_hwcc_nb because they are no longer specific to platform devices. Signed-off-by: Thomas Petazzoni Link: https://lkml.kernel.org/r/1399997070-11434-1-git-send-email-thomas.petazzoni@free-electrons.com Signed-off-by: Jason Cooper --- arch/arm/mach-mvebu/coherency.c | 21 ++++++++++++++++----- 1 file changed, 16 insertions(+), 5 deletions(-) diff --git a/arch/arm/mach-mvebu/coherency.c b/arch/arm/mach-mvebu/coherency.c index d5a975b6a590..5723178f6589 100644 --- a/arch/arm/mach-mvebu/coherency.c +++ b/arch/arm/mach-mvebu/coherency.c @@ -29,6 +29,7 @@ #include #include #include +#include #include #include #include "armada-370-xp.h" @@ -274,8 +275,8 @@ static struct dma_map_ops mvebu_hwcc_dma_ops = { .set_dma_mask = arm_dma_set_mask, }; -static int mvebu_hwcc_platform_notifier(struct notifier_block *nb, - unsigned long event, void *__dev) +static int mvebu_hwcc_notifier(struct notifier_block *nb, + unsigned long event, void *__dev) { struct device *dev = __dev; @@ -286,8 +287,8 @@ static int mvebu_hwcc_platform_notifier(struct notifier_block *nb, return NOTIFY_OK; } -static struct notifier_block mvebu_hwcc_platform_nb = { - .notifier_call = mvebu_hwcc_platform_notifier, +static struct notifier_block mvebu_hwcc_nb = { + .notifier_call = mvebu_hwcc_notifier, }; static void __init armada_370_coherency_init(struct device_node *np) @@ -375,9 +376,19 @@ static int __init coherency_late_init(void) } bus_register_notifier(&platform_bus_type, - &mvebu_hwcc_platform_nb); + &mvebu_hwcc_nb); return 0; } postcore_initcall(coherency_late_init); + +static int __init coherency_pci_init(void) +{ + if (coherency_available()) + bus_register_notifier(&pci_bus_type, + &mvebu_hwcc_nb); + return 0; +} + +arch_initcall(coherency_pci_init); -- 2.30.2