Impact: get notified if a device dma maps illegal areas

This patch adds a check to print a warning message when a device driver
tries to map a memory area from the kernel text segment or rodata.
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: saves stacktrace of a dma mapping and prints it if there is an  error
Signed-off-by: NDavid Woodhouse <dwmw2@infradead.org>
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

This adds a function to dump the DMA mappings that the debugging code is
aware of -- either for a single device, or for _all_ devices.

This can be useful for debugging -- sticking a call to it in the DMA
page fault handler, for example, to see if the faulting address _should_
be mapped or not, and hence work out whether it's IOMMU bugs we're
seeing, or driver bugs.
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>

Impact: add debug callbacks for dma_sync_sg_* functions
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: add debug callbacks for dma_sync_single_range_for_* functions
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: add debug callbacks for dma_sync_single_for_* functions
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: add debug callbacks for dma_[alloc|free]_coherent
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: add debug callbacks for dma_{un}map_sg
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: add debug callbacks for dma_{un}map_[page|single]
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: add functions to check on dma unmap and sync
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: add debugfs interface for configuring DMA-API debugging
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: add dma_debug= and dma_debug_entries= kernel parameters
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: add code to initialize dma-debug core data structures
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: add allocator code for struct dma_debug_entry
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: implement necessary functions for the core hash
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: add groundwork for DMA-API debugging
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Change header guards named "ASM_X86__*" to "_ASM_X86_*" since:

a. the double underscore is ugly and pointless.
b. no leading underscore violates namespace constraints.
Signed-off-by: NH. Peter Anvin <hpa@zytor.com>

Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
Signed-off-by: NH. Peter Anvin <hpa@zytor.com>

The AMD IOMMU can generate interrupts for various reasons. This patch
adds the basic interrupt enabling infrastructure to the driver.
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

This patch is the result of an automatic script that consolidates the
format of all the headers in include/asm-x86/.

The format:

1. No leading underscore. Names with leading underscores are reserved.
2. Pathname components are separated by two underscores. So we can
   distinguish between mm_types.h and mm/types.h.
3. Everything except letters and numbers are turned into single
   underscores.
Signed-off-by: NVegard Nossum <vegard.nossum@gmail.com>

This patch adds the amd_iommu.h file which will be included in the generic
code.
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>
Cc: iommu@lists.linux-foundation.org
Cc: bhavna.sarathy@amd.com
Cc: Sebastian.Biemueller@amd.com
Cc: robert.richter@amd.com
Cc: joro@8bytes.org
Signed-off-by: NIngo Molnar <mingo@elte.hu>