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author | 2015-08-04 12:17:53 -0700 | |
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committer | 2015-08-04 15:44:42 -0700 | |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/arch/ia64/hp/common/hwsw_iommu.c | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/arch/ia64/hp/common/hwsw_iommu.c')
-rw-r--r-- | kernel/arch/ia64/hp/common/hwsw_iommu.c | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/kernel/arch/ia64/hp/common/hwsw_iommu.c b/kernel/arch/ia64/hp/common/hwsw_iommu.c new file mode 100644 index 000000000..1e4cae5ae --- /dev/null +++ b/kernel/arch/ia64/hp/common/hwsw_iommu.c @@ -0,0 +1,59 @@ +/* + * Copyright (c) 2004 Hewlett-Packard Development Company, L.P. + * Contributed by David Mosberger-Tang <davidm@hpl.hp.com> + * + * This is a pseudo I/O MMU which dispatches to the hardware I/O MMU + * whenever possible. We assume that the hardware I/O MMU requires + * full 32-bit addressability, as is the case, e.g., for HP zx1-based + * systems (there, the I/O MMU window is mapped at 3-4GB). If a + * device doesn't provide full 32-bit addressability, we fall back on + * the sw I/O TLB. This is good enough to let us support broken + * hardware such as soundcards which have a DMA engine that can + * address only 28 bits. + */ + +#include <linux/device.h> +#include <linux/dma-mapping.h> +#include <linux/swiotlb.h> +#include <linux/export.h> +#include <asm/machvec.h> + +extern struct dma_map_ops sba_dma_ops, swiotlb_dma_ops; + +/* swiotlb declarations & definitions: */ +extern int swiotlb_late_init_with_default_size (size_t size); + +/* + * Note: we need to make the determination of whether or not to use + * the sw I/O TLB based purely on the device structure. Anything else + * would be unreliable or would be too intrusive. + */ +static inline int use_swiotlb(struct device *dev) +{ + return dev && dev->dma_mask && + !sba_dma_ops.dma_supported(dev, *dev->dma_mask); +} + +struct dma_map_ops *hwsw_dma_get_ops(struct device *dev) +{ + if (use_swiotlb(dev)) + return &swiotlb_dma_ops; + return &sba_dma_ops; +} +EXPORT_SYMBOL(hwsw_dma_get_ops); + +void __init +hwsw_init (void) +{ + /* default to a smallish 2MB sw I/O TLB */ + if (swiotlb_late_init_with_default_size (2 * (1<<20)) != 0) { +#ifdef CONFIG_IA64_GENERIC + /* Better to have normal DMA than panic */ + printk(KERN_WARNING "%s: Failed to initialize software I/O TLB," + " reverting to hpzx1 platform vector\n", __func__); + machvec_init("hpzx1"); +#else + panic("Unable to initialize software I/O TLB services"); +#endif + } +} |