- 14 Dec, 2013 40 commits
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Colin Cross authored
Add a /dev/ion-test device that will be created if CONFIG_ION_TEST is set. The device accepts a dma_buf fd and allows reading and writing to the backing memory using DMA-like apis or kernel mapping apis. Can be used to test the dma_buf mapping ops, including the ion implementations, from userspace. Signed-off-by:
Colin Cross <ccross@android.com> Signed-off-by:
John Stultz <john.stultz@linaro.org> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Colin Cross authored
ion_system_heap can only satisfy page alignment, and ion_system_contig_heap can only satisify alignment to the allocation size. Neither can support faulting user mappings because they use slab pages. Signed-off-by:
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Colin Cross authored
ion is always dealing with the allocation and not the mapping, so it should always be using sg->length and not sg->dma_length. Signed-off-by:
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Colin Cross authored
__dma_page_cpu_to_dev is a private ARM api that is not available on 3.10 and was never available on other architectures. We can get the same behavior by calling dma_sync_sg_for_device with a scatterlist containing a single page. It's still not quite a kosher use of the dma apis, we still conflate physical addresses with bus addresses, but it should at least compile on all platforms, and work on any platform that doesn't have a physical to bus address translation. Signed-off-by:
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Colin Cross authored
If userspace passes a length between -4095 and -1 to allocate it will pass the len != 0 check, but when len is page aligned it will be 0. Check len after page aligning. Drop the warning as well, userspace shouldn't be able to trigger a warning in the kernel. Signed-off-by:
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Colin Cross authored
commit 1262ab1846cf76f7549c66ef709120dbfbe6d49f (ion: replace userspace handle cookies with idr) broke the locking in ion. The ION_IOC_FREE and ION_IOC_MAP ioctls were relying on ion_handle_validate to detect the case where a call raced with another ION_IOC_FREE which may have freed the struct ion_handle. Rename ion_uhandle_get to ion_handle_get_by_id, and have it take the client lock and return with an extra reference to the handle. Make each caller put its reference once it is done with the handle. Also modify users of ion_handle_validate to continue to hold the client lock after calling ion_handle_validate until they are done with the handle, and warn if ion_handle_validate is called without the client lock held. Signed-off-by:
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John Stultz authored
The compat support added to ion didn't provide compat ioctl numbers (who's value depends on the compat structure size). So 32bit applications would get an error when trying to make ioctl calls. This patch adds the needed COMPAT_ macros and uses them in the compat_ion_ioctl, translating them to their non-compat cmd when calling the normal ioctl call. Signed-off-by:
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Colin Cross authored
Split the userspace api out of drivers/staging/android/ion/ion.h into drivers/staging/android/uapi/ion.h Signed-off-by:
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Colin Cross authored
The mapper abstraction layer was removed before the initial ion commit, but a stray ion_system_mapper.c file was left in. Delete it. Signed-off-by:
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Rom Lemarchand authored
Add a compat_ioctl to the ion driver Signed-off-by:
Rom Lemarchand <romlem@google.com> [jstultz: modified patch to apply to staging directory] Signed-off-by:
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Rom Lemarchand authored
Turn ion_user_handle_t to int. This change reflects the underlying type returned by the ion driver. Signed-off-by:
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Rom Lemarchand authored
Declare new ion_user_handle_t type to contain the token returned to user-space. This allows a 2-step migration of the user-space code to a new kernel header first, then will allow us to change the definition of the ion_user_handle_type_t to int without breaking the API. Signed-off-by:
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Colin Cross authored
ion userspace clients think that the cookie is a pointer, so they use NULL to check if the handle has been initialized. Set the first id number to 1. Signed-off-by:
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Colin Cross authored
The only remaining users of the client->handles rbtree are iterating through it like a list. Keep the rbtree, but change its index to be the buffer address instead of the handle address, which makes ion_handle_lookup a fast rbtree search. Signed-off-by:
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Colin Cross authored
Userspace handles should not leak kernel virtual addresses to userspace. They have to be validated by looking them up in an rbtree anyways, so replace them with an idr and validate them by using idr_find to convert the id number to the struct ion_handle pointer. Signed-off-by:
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Colin Cross authored
IS_ERR_OR_NULL is often part of a bad pattern that can accidentally return 0 on error: if (IS_ERR_OR_NULL(ptr)) return PTR_ERR(ptr); It also usually means that the errors of a function are not well defined. Replace all uses in ion.c by ensure that the return type of any function in ion is an ERR_PTR. Specify that the expected return value from map_kernel or map_dma heap ops is ERR_PTR, and warn if a heap returns NULL. Signed-off-by: -
Colin Cross authored
ion is going to stop accepting NULL as an error value, use ERR_PTR. Signed-off-by:
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Colin Cross authored
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Colin Cross authored
buffer->size is controlled by the outer ion layer, don't modify it inside the heap. Instead, compute the rounded up allocated size on demand. Signed-off-by:
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Rebecca Schultz Zavin authored
Previously the code to fault ion buffers in one page at a time had a performance problem caused by the requirement to traverse the sg list looking for the right page to load in (a result of the fact that the items in the list may not be of uniform size). To fix the problem, for buffers that will be faulted in, also keep a flat array of all the pages in the buffer to use from the fault handler. To recover some of the additional memory footprint this creates per buffer, dirty bits used to indicate which pages have been faulted in to the cpu are now stored in the low bit of each page struct pointer in the page array. Signed-off-by:
Rebecca Schultz Zavin <rebecca@android.com> [jstultz: modified patch to apply to staging directory] Signed-off-by:
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Benjamin Gaignard authored
New heap type ION_HEAP_TYPE_DMA where allocation is done with dma_alloc_coherent API. device coherent_dma_mask must be set to DMA_BIT_MASK(32). ion_platform_heap private field is used to retrieve the device linked to CMA, if NULL the default CMA area is used. ion_cma_get_sgtable is a copy of dma_common_get_sgtable function which should be in kernel 3.5 Signed-off-by:
Benjamin Gaignard <benjamin.gaignard@linaro.org> [jstultz: modified patch to apply to staging directory] Signed-off-by:
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Benjamin Gaignard authored
fix ion_platform_heap to make is use an usual way in board configuration file. Signed-off-by:
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John Stultz authored
The ion code has some very specific arm-isms which keeps it from building on other architectures. These should probably be resolved, but in the mean time, add a dependency on CONFIG_ARM to avoid build failures. v2: Fix earlier flub, sending out an early untested version of the patch. Cc: Arve Hjønnevåg <arve@android.com> Cc: Rebecca Schultz Zavin <rebecca@android.com> Cc: Android Kernel Team <kernel-team@android.com> [jstultz: modified patch to apply to staging directory] Signed-off-by:
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Arve Hjønnevåg authored
It no longer exists. Signed-off-by:
Arve Hjønnevåg <arve@android.com> [jstultz: modified patch to apply to staging directory] Signed-off-by:
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Arve Hjønnevåg authored
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Rebecca Schultz Zavin authored
When the system is low on memory, we want to shrink any cached system memory ion is holding. Previously we were shrinking memory in the page pools, but not in the deferred free list. This patch makes it possible to shrink both. It also moves the shrinker code into the heaps so they can correctly manage any caches they might contain. Signed-off-by:
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Rebecca Schultz Zavin authored
The high variable was sometimes used uninitialized Signed-off-by:
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Rebecca Schultz Zavin authored
Allocations from the ion heap need to be zeroed to protect userspace from seeing memory belonging to other processes. First allocations from this heap were not zero'd allowing users to see memory from other processes on a warm reset. Signed-off-by:
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JP Abgrall authored
With CONFIG_SLUB_DEBUG_ON it would panic during ion_alloc() ion_buffer_create() io_heap_drain_freelist() Signed-off-by:
JP Abgrall <jpa@google.com> [jstultz: modified patch to apply to staging directory] Signed-off-by:
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Rebecca Schultz Zavin authored
Add the ability for a heap to free buffers asynchrounously. Freed buffers are placed on a free list and freed from a low priority background thread. If allocations from a particular heap fail, the free list is drained. This patch also enable asynchronous frees from the chunk heap. Signed-off-by:
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Johan Mossberg authored
Currently ion can only share buffers with dma buf fd's. Fd's can not be used inside the kernel as they are process specific so support for sharing buffers with dma buf kernel handles is needed to support kernel only use cases. An example use case could be a GPU driver using ion that wants to share its output buffers with a 3d party display controller driver supporting dma buf. Signed-off-by:
Johan Mossberg <johan.mossberg@stericsson.com> [jstultz: modified patch to apply to staging directory] Signed-off-by:
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Rebecca Schultz Zavin authored
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Rebecca Schultz Zavin authored
Refactor the code in the system heap used to map and zero the buffers into a seperate utility so it can be called from other heaps. Use it from the chunk heap. Signed-off-by:
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Rebecca Schultz Zavin authored
vmap/vunmap spend a significant amount of time allocating the address space to map into. Rather than allocating address space for each page, instead allocate once for the entire allocation and then just map and unmap each page into that address space. Signed-off-by:
Rebecca Schultz Zavin <rschultz@google.com> [jstultz: modified patch to apply to staging directory] Signed-off-by:
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Rebecca Schultz Zavin authored
The heapmask in the client generally wasn't being used. This patch removes it. Signed-off-by:
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Johan Mossberg authored
Will enable modules to allocate memory with ion. Signed-off-by:
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Rebecca Schultz Zavin authored
There is some confusion between when to use the heap type and when the id. This patch clarifies this by using clearer variable names and describing the intention in the comments. Also fixes the client debug code to print heaps by id instead of type. Signed-off-by:
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Rebecca Schultz Zavin authored
This patch adds support for a chunk heap that allows for buffers that are made up of a list of fixed size chunks taken from a carveout. Chunk sizes are configured when the heaps are created by passing the chunk size in the priv field of the heap platform data. Signed-off-by:
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Rebecca Schultz Zavin authored
The system heap contained several general purpose functions to map buffers to the kernel and userspace. This patch refactors those into ion_heap.c so they can be used by other heaps. Signed-off-by:
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Rebecca Schultz Zavin authored
Switches the rbtree tree of heaps for a plist. This significantly simplifies the code and the list is small and is modified only at first boot so the rbtree is unnecessary. This also switches the traversal of the heap list to traverse from highest to lowest id's. This allows allocations to pass a heap mask that falls back on the system heap -- typically id 0, which is the common case. Signed-off-by:
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