mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-30 10:06:43 +07:00
6e5267aa54
Some platforms might require to increase atomic coherent pool to make sure that their device will be able to allocate all their buffers from atomic context. This function can be also used to decrease atomic coherent pool size if coherent allocations are not used for the given sub-platform. Suggested-by: Josh Coombs <josh.coombs@gmail.com> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
277 lines
8.6 KiB
C
277 lines
8.6 KiB
C
#ifndef ASMARM_DMA_MAPPING_H
|
|
#define ASMARM_DMA_MAPPING_H
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#include <linux/mm_types.h>
|
|
#include <linux/scatterlist.h>
|
|
#include <linux/dma-attrs.h>
|
|
#include <linux/dma-debug.h>
|
|
|
|
#include <asm-generic/dma-coherent.h>
|
|
#include <asm/memory.h>
|
|
|
|
#define DMA_ERROR_CODE (~0)
|
|
extern struct dma_map_ops arm_dma_ops;
|
|
|
|
static inline struct dma_map_ops *get_dma_ops(struct device *dev)
|
|
{
|
|
if (dev && dev->archdata.dma_ops)
|
|
return dev->archdata.dma_ops;
|
|
return &arm_dma_ops;
|
|
}
|
|
|
|
static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops)
|
|
{
|
|
BUG_ON(!dev);
|
|
dev->archdata.dma_ops = ops;
|
|
}
|
|
|
|
#include <asm-generic/dma-mapping-common.h>
|
|
|
|
static inline int dma_set_mask(struct device *dev, u64 mask)
|
|
{
|
|
return get_dma_ops(dev)->set_dma_mask(dev, mask);
|
|
}
|
|
|
|
#ifdef __arch_page_to_dma
|
|
#error Please update to __arch_pfn_to_dma
|
|
#endif
|
|
|
|
/*
|
|
* dma_to_pfn/pfn_to_dma/dma_to_virt/virt_to_dma are architecture private
|
|
* functions used internally by the DMA-mapping API to provide DMA
|
|
* addresses. They must not be used by drivers.
|
|
*/
|
|
#ifndef __arch_pfn_to_dma
|
|
static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn)
|
|
{
|
|
return (dma_addr_t)__pfn_to_bus(pfn);
|
|
}
|
|
|
|
static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr)
|
|
{
|
|
return __bus_to_pfn(addr);
|
|
}
|
|
|
|
static inline void *dma_to_virt(struct device *dev, dma_addr_t addr)
|
|
{
|
|
return (void *)__bus_to_virt((unsigned long)addr);
|
|
}
|
|
|
|
static inline dma_addr_t virt_to_dma(struct device *dev, void *addr)
|
|
{
|
|
return (dma_addr_t)__virt_to_bus((unsigned long)(addr));
|
|
}
|
|
#else
|
|
static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn)
|
|
{
|
|
return __arch_pfn_to_dma(dev, pfn);
|
|
}
|
|
|
|
static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr)
|
|
{
|
|
return __arch_dma_to_pfn(dev, addr);
|
|
}
|
|
|
|
static inline void *dma_to_virt(struct device *dev, dma_addr_t addr)
|
|
{
|
|
return __arch_dma_to_virt(dev, addr);
|
|
}
|
|
|
|
static inline dma_addr_t virt_to_dma(struct device *dev, void *addr)
|
|
{
|
|
return __arch_virt_to_dma(dev, addr);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* DMA errors are defined by all-bits-set in the DMA address.
|
|
*/
|
|
static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
|
|
{
|
|
return dma_addr == DMA_ERROR_CODE;
|
|
}
|
|
|
|
/*
|
|
* Dummy noncoherent implementation. We don't provide a dma_cache_sync
|
|
* function so drivers using this API are highlighted with build warnings.
|
|
*/
|
|
static inline void *dma_alloc_noncoherent(struct device *dev, size_t size,
|
|
dma_addr_t *handle, gfp_t gfp)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline void dma_free_noncoherent(struct device *dev, size_t size,
|
|
void *cpu_addr, dma_addr_t handle)
|
|
{
|
|
}
|
|
|
|
extern int dma_supported(struct device *dev, u64 mask);
|
|
|
|
/**
|
|
* arm_dma_alloc - allocate consistent memory for DMA
|
|
* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
|
|
* @size: required memory size
|
|
* @handle: bus-specific DMA address
|
|
* @attrs: optinal attributes that specific mapping properties
|
|
*
|
|
* Allocate some memory for a device for performing DMA. This function
|
|
* allocates pages, and will return the CPU-viewed address, and sets @handle
|
|
* to be the device-viewed address.
|
|
*/
|
|
extern void *arm_dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
|
|
gfp_t gfp, struct dma_attrs *attrs);
|
|
|
|
#define dma_alloc_coherent(d, s, h, f) dma_alloc_attrs(d, s, h, f, NULL)
|
|
|
|
static inline void *dma_alloc_attrs(struct device *dev, size_t size,
|
|
dma_addr_t *dma_handle, gfp_t flag,
|
|
struct dma_attrs *attrs)
|
|
{
|
|
struct dma_map_ops *ops = get_dma_ops(dev);
|
|
void *cpu_addr;
|
|
BUG_ON(!ops);
|
|
|
|
cpu_addr = ops->alloc(dev, size, dma_handle, flag, attrs);
|
|
debug_dma_alloc_coherent(dev, size, *dma_handle, cpu_addr);
|
|
return cpu_addr;
|
|
}
|
|
|
|
/**
|
|
* arm_dma_free - free memory allocated by arm_dma_alloc
|
|
* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
|
|
* @size: size of memory originally requested in dma_alloc_coherent
|
|
* @cpu_addr: CPU-view address returned from dma_alloc_coherent
|
|
* @handle: device-view address returned from dma_alloc_coherent
|
|
* @attrs: optinal attributes that specific mapping properties
|
|
*
|
|
* Free (and unmap) a DMA buffer previously allocated by
|
|
* arm_dma_alloc().
|
|
*
|
|
* References to memory and mappings associated with cpu_addr/handle
|
|
* during and after this call executing are illegal.
|
|
*/
|
|
extern void arm_dma_free(struct device *dev, size_t size, void *cpu_addr,
|
|
dma_addr_t handle, struct dma_attrs *attrs);
|
|
|
|
#define dma_free_coherent(d, s, c, h) dma_free_attrs(d, s, c, h, NULL)
|
|
|
|
static inline void dma_free_attrs(struct device *dev, size_t size,
|
|
void *cpu_addr, dma_addr_t dma_handle,
|
|
struct dma_attrs *attrs)
|
|
{
|
|
struct dma_map_ops *ops = get_dma_ops(dev);
|
|
BUG_ON(!ops);
|
|
|
|
debug_dma_free_coherent(dev, size, cpu_addr, dma_handle);
|
|
ops->free(dev, size, cpu_addr, dma_handle, attrs);
|
|
}
|
|
|
|
/**
|
|
* arm_dma_mmap - map a coherent DMA allocation into user space
|
|
* @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
|
|
* @vma: vm_area_struct describing requested user mapping
|
|
* @cpu_addr: kernel CPU-view address returned from dma_alloc_coherent
|
|
* @handle: device-view address returned from dma_alloc_coherent
|
|
* @size: size of memory originally requested in dma_alloc_coherent
|
|
* @attrs: optinal attributes that specific mapping properties
|
|
*
|
|
* Map a coherent DMA buffer previously allocated by dma_alloc_coherent
|
|
* into user space. The coherent DMA buffer must not be freed by the
|
|
* driver until the user space mapping has been released.
|
|
*/
|
|
extern int arm_dma_mmap(struct device *dev, struct vm_area_struct *vma,
|
|
void *cpu_addr, dma_addr_t dma_addr, size_t size,
|
|
struct dma_attrs *attrs);
|
|
|
|
static inline void *dma_alloc_writecombine(struct device *dev, size_t size,
|
|
dma_addr_t *dma_handle, gfp_t flag)
|
|
{
|
|
DEFINE_DMA_ATTRS(attrs);
|
|
dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs);
|
|
return dma_alloc_attrs(dev, size, dma_handle, flag, &attrs);
|
|
}
|
|
|
|
static inline void dma_free_writecombine(struct device *dev, size_t size,
|
|
void *cpu_addr, dma_addr_t dma_handle)
|
|
{
|
|
DEFINE_DMA_ATTRS(attrs);
|
|
dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs);
|
|
return dma_free_attrs(dev, size, cpu_addr, dma_handle, &attrs);
|
|
}
|
|
|
|
/*
|
|
* This can be called during early boot to increase the size of the atomic
|
|
* coherent DMA pool above the default value of 256KiB. It must be called
|
|
* before postcore_initcall.
|
|
*/
|
|
extern void __init init_dma_coherent_pool_size(unsigned long size);
|
|
|
|
/*
|
|
* This can be called during boot to increase the size of the consistent
|
|
* DMA region above it's default value of 2MB. It must be called before the
|
|
* memory allocator is initialised, i.e. before any core_initcall.
|
|
*/
|
|
static inline void init_consistent_dma_size(unsigned long size) { }
|
|
|
|
/*
|
|
* For SA-1111, IXP425, and ADI systems the dma-mapping functions are "magic"
|
|
* and utilize bounce buffers as needed to work around limited DMA windows.
|
|
*
|
|
* On the SA-1111, a bug limits DMA to only certain regions of RAM.
|
|
* On the IXP425, the PCI inbound window is 64MB (256MB total RAM)
|
|
* On some ADI engineering systems, PCI inbound window is 32MB (12MB total RAM)
|
|
*
|
|
* The following are helper functions used by the dmabounce subystem
|
|
*
|
|
*/
|
|
|
|
/**
|
|
* dmabounce_register_dev
|
|
*
|
|
* @dev: valid struct device pointer
|
|
* @small_buf_size: size of buffers to use with small buffer pool
|
|
* @large_buf_size: size of buffers to use with large buffer pool (can be 0)
|
|
* @needs_bounce_fn: called to determine whether buffer needs bouncing
|
|
*
|
|
* This function should be called by low-level platform code to register
|
|
* a device as requireing DMA buffer bouncing. The function will allocate
|
|
* appropriate DMA pools for the device.
|
|
*/
|
|
extern int dmabounce_register_dev(struct device *, unsigned long,
|
|
unsigned long, int (*)(struct device *, dma_addr_t, size_t));
|
|
|
|
/**
|
|
* dmabounce_unregister_dev
|
|
*
|
|
* @dev: valid struct device pointer
|
|
*
|
|
* This function should be called by low-level platform code when device
|
|
* that was previously registered with dmabounce_register_dev is removed
|
|
* from the system.
|
|
*
|
|
*/
|
|
extern void dmabounce_unregister_dev(struct device *);
|
|
|
|
|
|
|
|
/*
|
|
* The scatter list versions of the above methods.
|
|
*/
|
|
extern int arm_dma_map_sg(struct device *, struct scatterlist *, int,
|
|
enum dma_data_direction, struct dma_attrs *attrs);
|
|
extern void arm_dma_unmap_sg(struct device *, struct scatterlist *, int,
|
|
enum dma_data_direction, struct dma_attrs *attrs);
|
|
extern void arm_dma_sync_sg_for_cpu(struct device *, struct scatterlist *, int,
|
|
enum dma_data_direction);
|
|
extern void arm_dma_sync_sg_for_device(struct device *, struct scatterlist *, int,
|
|
enum dma_data_direction);
|
|
extern int arm_dma_get_sgtable(struct device *dev, struct sg_table *sgt,
|
|
void *cpu_addr, dma_addr_t dma_addr, size_t size,
|
|
struct dma_attrs *attrs);
|
|
|
|
#endif /* __KERNEL__ */
|
|
#endif
|