@@ -19,8 +19,8 @@ config ARM
select ARCH_HAS_SET_MEMORY
select ARCH_HAS_STRICT_KERNEL_RWX if MMU && !XIP_KERNEL
select ARCH_HAS_STRICT_MODULE_RWX if MMU
- select ARCH_HAS_SYNC_DMA_FOR_DEVICE if SWIOTLB || !MMU
- select ARCH_HAS_SYNC_DMA_FOR_CPU if SWIOTLB || !MMU
+ select ARCH_HAS_SYNC_DMA_FOR_DEVICE
+ select ARCH_HAS_SYNC_DMA_FOR_CPU
select ARCH_HAS_TEARDOWN_DMA_OPS if MMU
select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
select ARCH_HAVE_CUSTOM_GPIO_H
deleted file mode 100644
@@ -1,24 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef ASMARM_DMA_MAPPING_H
-#define ASMARM_DMA_MAPPING_H
-
-#ifdef __KERNEL__
-
-#include <linux/mm_types.h>
-#include <linux/scatterlist.h>
-
-#include <xen/xen.h>
-#include <asm/xen/hypervisor.h>
-
-extern const struct dma_map_ops arm_dma_ops;
-extern const struct dma_map_ops arm_coherent_dma_ops;
-
-static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
-{
- if (IS_ENABLED(CONFIG_MMU) && !IS_ENABLED(CONFIG_ARM_LPAE))
- return &arm_dma_ops;
- return NULL;
-}
-
-#endif /* __KERNEL__ */
-#endif
@@ -98,7 +98,7 @@ static int highbank_platform_notifier(struct notifier_block *nb,
if (of_property_read_bool(dev->of_node, "dma-coherent")) {
val = readl(sregs_base + reg);
writel(val | 0xff01, sregs_base + reg);
- set_dma_ops(dev, &arm_coherent_dma_ops);
+ dev->dma_coherent = true;
}
return NOTIFY_OK;
@@ -98,7 +98,7 @@ static int mvebu_hwcc_notifier(struct notifier_block *nb,
if (event != BUS_NOTIFY_ADD_DEVICE)
return NOTIFY_DONE;
- set_dma_ops(dev, &arm_coherent_dma_ops);
+ dev->dma_coherent = true;
return NOTIFY_OK;
}
@@ -103,79 +103,8 @@ static struct arm_dma_buffer *arm_dma_buffer_find(void *virt)
* before transfers and delay cache invalidation until transfer completion.
*
*/
-static void __dma_page_cpu_to_dev(struct page *, unsigned long,
- size_t, enum dma_data_direction);
-static void __dma_page_dev_to_cpu(struct page *, unsigned long,
- size_t, enum dma_data_direction);
-
-/**
- * arm_dma_map_page - map a portion of a page for streaming DMA
- * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
- * @page: page that buffer resides in
- * @offset: offset into page for start of buffer
- * @size: size of buffer to map
- * @dir: DMA transfer direction
- *
- * Ensure that any data held in the cache is appropriately discarded
- * or written back.
- *
- * The device owns this memory once this call has completed. The CPU
- * can regain ownership by calling dma_unmap_page().
- */
-static dma_addr_t arm_dma_map_page(struct device *dev, struct page *page,
- unsigned long offset, size_t size, enum dma_data_direction dir,
- unsigned long attrs)
-{
- if ((attrs & DMA_ATTR_SKIP_CPU_SYNC) == 0)
- __dma_page_cpu_to_dev(page, offset, size, dir);
- return phys_to_dma(dev, page_to_phys(page) + offset);
-}
-
-static dma_addr_t arm_coherent_dma_map_page(struct device *dev, struct page *page,
- unsigned long offset, size_t size, enum dma_data_direction dir,
- unsigned long attrs)
-{
- return phys_to_dma(dev, page_to_phys(page) + offset);
-}
-
-/**
- * arm_dma_unmap_page - unmap a buffer previously mapped through dma_map_page()
- * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
- * @handle: DMA address of buffer
- * @size: size of buffer (same as passed to dma_map_page)
- * @dir: DMA transfer direction (same as passed to dma_map_page)
- *
- * Unmap a page streaming mode DMA translation. The handle and size
- * must match what was provided in the previous dma_map_page() call.
- * All other usages are undefined.
- *
- * After this call, reads by the CPU to the buffer are guaranteed to see
- * whatever the device wrote there.
- */
-static void arm_dma_unmap_page(struct device *dev, dma_addr_t handle,
- size_t size, enum dma_data_direction dir, unsigned long attrs)
-{
- if ((attrs & DMA_ATTR_SKIP_CPU_SYNC) == 0)
- __dma_page_dev_to_cpu(phys_to_page(dma_to_phys(dev, handle)),
- handle & ~PAGE_MASK, size, dir);
-}
-
-static void arm_dma_sync_single_for_cpu(struct device *dev,
- dma_addr_t handle, size_t size, enum dma_data_direction dir)
-{
- unsigned int offset = handle & (PAGE_SIZE - 1);
- struct page *page = phys_to_page(dma_to_phys(dev, handle-offset));
- __dma_page_dev_to_cpu(page, offset, size, dir);
-}
-
-static void arm_dma_sync_single_for_device(struct device *dev,
- dma_addr_t handle, size_t size, enum dma_data_direction dir)
-{
- unsigned int offset = handle & (PAGE_SIZE - 1);
- struct page *page = phys_to_page(dma_to_phys(dev, handle-offset));
- __dma_page_cpu_to_dev(page, offset, size, dir);
-}
+#ifdef CONFIG_ARM_DMA_USE_IOMMU
/*
* Return whether the given device DMA address mask can be supported
* properly. For example, if your device can only drive the low 24-bits
@@ -192,6 +121,7 @@ static int arm_dma_supported(struct device *dev, u64 mask)
*/
return PHYS_PFN(dma_to_phys(dev, mask)) >= max_dma_pfn;
}
+#endif
static void __dma_clear_buffer(struct page *page, size_t size, int coherent_flag)
{
@@ -694,67 +624,6 @@ static void *__dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
return args.want_vaddr ? addr : page;
}
-/*
- * Allocate DMA-coherent memory space and return both the kernel remapped
- * virtual and bus address for that space.
- */
-static void *arm_dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
- gfp_t gfp, unsigned long attrs)
-{
- pgprot_t prot = __get_dma_pgprot(attrs, PAGE_KERNEL);
-
- return __dma_alloc(dev, size, handle, gfp, prot, false,
- attrs, __builtin_return_address(0));
-}
-
-static void *arm_coherent_dma_alloc(struct device *dev, size_t size,
- dma_addr_t *handle, gfp_t gfp, unsigned long attrs)
-{
- return __dma_alloc(dev, size, handle, gfp, PAGE_KERNEL, true,
- attrs, __builtin_return_address(0));
-}
-
-static int __arm_dma_mmap(struct device *dev, struct vm_area_struct *vma,
- void *cpu_addr, dma_addr_t dma_addr, size_t size,
- unsigned long attrs)
-{
- int ret = -ENXIO;
- unsigned long nr_vma_pages = vma_pages(vma);
- unsigned long nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
- unsigned long pfn = PHYS_PFN(dma_to_phys(dev, dma_addr));
- unsigned long off = vma->vm_pgoff;
-
- if (dma_mmap_from_dev_coherent(dev, vma, cpu_addr, size, &ret))
- return ret;
-
- if (off < nr_pages && nr_vma_pages <= (nr_pages - off)) {
- ret = remap_pfn_range(vma, vma->vm_start,
- pfn + off,
- vma->vm_end - vma->vm_start,
- vma->vm_page_prot);
- }
-
- return ret;
-}
-
-/*
- * Create userspace mapping for the DMA-coherent memory.
- */
-static int arm_coherent_dma_mmap(struct device *dev, struct vm_area_struct *vma,
- void *cpu_addr, dma_addr_t dma_addr, size_t size,
- unsigned long attrs)
-{
- return __arm_dma_mmap(dev, vma, cpu_addr, dma_addr, size, attrs);
-}
-
-static int arm_dma_mmap(struct device *dev, struct vm_area_struct *vma,
- void *cpu_addr, dma_addr_t dma_addr, size_t size,
- unsigned long attrs)
-{
- vma->vm_page_prot = __get_dma_pgprot(attrs, vma->vm_page_prot);
- return __arm_dma_mmap(dev, vma, cpu_addr, dma_addr, size, attrs);
-}
-
/*
* Free a buffer as defined by the above mapping.
*/
@@ -780,40 +649,6 @@ static void __arm_dma_free(struct device *dev, size_t size, void *cpu_addr,
kfree(buf);
}
-static void arm_dma_free(struct device *dev, size_t size, void *cpu_addr,
- dma_addr_t handle, unsigned long attrs)
-{
- __arm_dma_free(dev, size, cpu_addr, handle, attrs, false);
-}
-
-static void arm_coherent_dma_free(struct device *dev, size_t size, void *cpu_addr,
- dma_addr_t handle, unsigned long attrs)
-{
- __arm_dma_free(dev, size, cpu_addr, handle, attrs, true);
-}
-
-static int arm_dma_get_sgtable(struct device *dev, struct sg_table *sgt,
- void *cpu_addr, dma_addr_t handle, size_t size,
- unsigned long attrs)
-{
- phys_addr_t paddr = dma_to_phys(dev, handle);
- struct page *page;
- int ret;
-
- /* If the PFN is not valid, we do not have a struct page */
- if (!pfn_valid(PHYS_PFN(paddr)))
- return -ENXIO;
-
- page = phys_to_page(paddr);
-
- ret = sg_alloc_table(sgt, 1, GFP_KERNEL);
- if (unlikely(ret))
- return ret;
-
- sg_set_page(sgt->sgl, page, PAGE_ALIGN(size), 0);
- return 0;
-}
-
static void dma_cache_maint_page(struct page *page, unsigned long offset,
size_t size, enum dma_data_direction dir,
void (*op)(const void *, size_t, int))
@@ -917,158 +752,6 @@ static void __dma_page_dev_to_cpu(struct page *page, unsigned long off,
}
}
-/**
- * arm_dma_map_sg - map a set of SG buffers for streaming mode DMA
- * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
- * @sg: list of buffers
- * @nents: number of buffers to map
- * @dir: DMA transfer direction
- *
- * Map a set of buffers described by scatterlist in streaming mode for DMA.
- * This is the scatter-gather version of the dma_map_single interface.
- * Here the scatter gather list elements are each tagged with the
- * appropriate dma address and length. They are obtained via
- * sg_dma_{address,length}.
- *
- * Device ownership issues as mentioned for dma_map_single are the same
- * here.
- */
-static int arm_dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
- enum dma_data_direction dir, unsigned long attrs)
-{
- const struct dma_map_ops *ops = get_dma_ops(dev);
- struct scatterlist *s;
- int i, j, ret;
-
- for_each_sg(sg, s, nents, i) {
-#ifdef CONFIG_NEED_SG_DMA_LENGTH
- s->dma_length = s->length;
-#endif
- s->dma_address = ops->map_page(dev, sg_page(s), s->offset,
- s->length, dir, attrs);
- if (dma_mapping_error(dev, s->dma_address)) {
- ret = -EIO;
- goto bad_mapping;
- }
- }
- return nents;
-
- bad_mapping:
- for_each_sg(sg, s, i, j)
- ops->unmap_page(dev, sg_dma_address(s), sg_dma_len(s), dir, attrs);
- return ret;
-}
-
-/**
- * arm_dma_unmap_sg - unmap a set of SG buffers mapped by dma_map_sg
- * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
- * @sg: list of buffers
- * @nents: number of buffers to unmap (same as was passed to dma_map_sg)
- * @dir: DMA transfer direction (same as was passed to dma_map_sg)
- *
- * Unmap a set of streaming mode DMA translations. Again, CPU access
- * rules concerning calls here are the same as for dma_unmap_single().
- */
-static void arm_dma_unmap_sg(struct device *dev, struct scatterlist *sg,
- int nents, enum dma_data_direction dir, unsigned long attrs)
-{
- const struct dma_map_ops *ops = get_dma_ops(dev);
- struct scatterlist *s;
-
- int i;
-
- for_each_sg(sg, s, nents, i)
- ops->unmap_page(dev, sg_dma_address(s), sg_dma_len(s), dir, attrs);
-}
-
-/**
- * arm_dma_sync_sg_for_cpu
- * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
- * @sg: list of buffers
- * @nents: number of buffers to map (returned from dma_map_sg)
- * @dir: DMA transfer direction (same as was passed to dma_map_sg)
- */
-static void arm_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg,
- int nents, enum dma_data_direction dir)
-{
- const struct dma_map_ops *ops = get_dma_ops(dev);
- struct scatterlist *s;
- int i;
-
- for_each_sg(sg, s, nents, i)
- ops->sync_single_for_cpu(dev, sg_dma_address(s), s->length,
- dir);
-}
-
-/**
- * arm_dma_sync_sg_for_device
- * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
- * @sg: list of buffers
- * @nents: number of buffers to map (returned from dma_map_sg)
- * @dir: DMA transfer direction (same as was passed to dma_map_sg)
- */
-static void arm_dma_sync_sg_for_device(struct device *dev,
- struct scatterlist *sg, int nents, enum dma_data_direction dir)
-{
- const struct dma_map_ops *ops = get_dma_ops(dev);
- struct scatterlist *s;
- int i;
-
- for_each_sg(sg, s, nents, i)
- ops->sync_single_for_device(dev, sg_dma_address(s), s->length,
- dir);
-}
-
-const struct dma_map_ops arm_dma_ops = {
- .alloc = arm_dma_alloc,
- .free = arm_dma_free,
- .alloc_pages = dma_direct_alloc_pages,
- .free_pages = dma_direct_free_pages,
- .mmap = arm_dma_mmap,
- .get_sgtable = arm_dma_get_sgtable,
- .map_page = arm_dma_map_page,
- .unmap_page = arm_dma_unmap_page,
- .map_sg = arm_dma_map_sg,
- .unmap_sg = arm_dma_unmap_sg,
- .map_resource = dma_direct_map_resource,
- .sync_single_for_cpu = arm_dma_sync_single_for_cpu,
- .sync_single_for_device = arm_dma_sync_single_for_device,
- .sync_sg_for_cpu = arm_dma_sync_sg_for_cpu,
- .sync_sg_for_device = arm_dma_sync_sg_for_device,
- .dma_supported = arm_dma_supported,
- .get_required_mask = dma_direct_get_required_mask,
-};
-EXPORT_SYMBOL(arm_dma_ops);
-
-const struct dma_map_ops arm_coherent_dma_ops = {
- .alloc = arm_coherent_dma_alloc,
- .free = arm_coherent_dma_free,
- .alloc_pages = dma_direct_alloc_pages,
- .free_pages = dma_direct_free_pages,
- .mmap = arm_coherent_dma_mmap,
- .get_sgtable = arm_dma_get_sgtable,
- .map_page = arm_coherent_dma_map_page,
- .map_sg = arm_dma_map_sg,
- .map_resource = dma_direct_map_resource,
- .dma_supported = arm_dma_supported,
- .get_required_mask = dma_direct_get_required_mask,
-};
-EXPORT_SYMBOL(arm_coherent_dma_ops);
-
-static const struct dma_map_ops *arm_get_dma_map_ops(bool coherent)
-{
- /*
- * When CONFIG_ARM_LPAE is set, physical address can extend above
- * 32-bits, which then can't be addressed by devices that only support
- * 32-bit DMA.
- * Use the generic dma-direct / swiotlb ops code in that case, as that
- * handles bounce buffering for us.
- */
- if (IS_ENABLED(CONFIG_ARM_LPAE))
- return NULL;
- return coherent ? &arm_coherent_dma_ops : &arm_dma_ops;
-}
-
#ifdef CONFIG_ARM_DMA_USE_IOMMU
static int __dma_info_to_prot(enum dma_data_direction dir, unsigned long attrs)
@@ -2193,40 +1876,35 @@ void arm_iommu_detach_device(struct device *dev)
iommu_detach_device(mapping->domain, dev);
kref_put(&mapping->kref, release_iommu_mapping);
to_dma_iommu_mapping(dev) = NULL;
- set_dma_ops(dev, arm_get_dma_map_ops(dev->archdata.dma_coherent));
+ set_dma_ops(dev, NULL);
pr_debug("Detached IOMMU controller from %s device.\n", dev_name(dev));
}
EXPORT_SYMBOL_GPL(arm_iommu_detach_device);
-static const struct dma_map_ops *arm_get_iommu_dma_map_ops(bool coherent)
-{
- return coherent ? &iommu_coherent_ops : &iommu_ops;
-}
-
-static bool arm_setup_iommu_dma_ops(struct device *dev, u64 dma_base, u64 size,
- const struct iommu_ops *iommu)
+static void arm_setup_iommu_dma_ops(struct device *dev, u64 dma_base, u64 size,
+ const struct iommu_ops *iommu, bool coherent)
{
struct dma_iommu_mapping *mapping;
- if (!iommu)
- return false;
-
mapping = arm_iommu_create_mapping(dev->bus, dma_base, size);
if (IS_ERR(mapping)) {
pr_warn("Failed to create %llu-byte IOMMU mapping for device %s\n",
size, dev_name(dev));
- return false;
+ return;
}
if (__arm_iommu_attach_device(dev, mapping)) {
pr_warn("Failed to attached device %s to IOMMU_mapping\n",
dev_name(dev));
arm_iommu_release_mapping(mapping);
- return false;
+ return;
}
- return true;
+ if (coherent)
+ set_dma_ops(dev, &iommu_coherent_ops);
+ else
+ set_dma_ops(dev, &iommu_ops);
}
static void arm_teardown_iommu_dma_ops(struct device *dev)
@@ -2242,27 +1920,20 @@ static void arm_teardown_iommu_dma_ops(struct device *dev)
#else
-static bool arm_setup_iommu_dma_ops(struct device *dev, u64 dma_base, u64 size,
- const struct iommu_ops *iommu)
+static void arm_setup_iommu_dma_ops(struct device *dev, u64 dma_base, u64 size,
+ const struct iommu_ops *iommu, bool coherent)
{
- return false;
}
static void arm_teardown_iommu_dma_ops(struct device *dev) { }
-#define arm_get_iommu_dma_map_ops arm_get_dma_map_ops
-
#endif /* CONFIG_ARM_DMA_USE_IOMMU */
void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
const struct iommu_ops *iommu, bool coherent)
{
- const struct dma_map_ops *dma_ops;
-
dev->archdata.dma_coherent = coherent;
-#ifdef CONFIG_SWIOTLB
dev->dma_coherent = coherent;
-#endif
/*
* Don't override the dma_ops if they have already been set. Ideally
@@ -2272,12 +1943,8 @@ void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
if (dev->dma_ops)
return;
- if (arm_setup_iommu_dma_ops(dev, dma_base, size, iommu))
- dma_ops = arm_get_iommu_dma_map_ops(coherent);
- else
- dma_ops = arm_get_dma_map_ops(coherent);
-
- set_dma_ops(dev, dma_ops);
+ if (iommu)
+ arm_setup_iommu_dma_ops(dev, dma_base, size, iommu, coherent);
#ifdef CONFIG_XEN
if (xen_initial_domain())
@@ -2296,7 +1963,6 @@ void arch_teardown_dma_ops(struct device *dev)
set_dma_ops(dev, NULL);
}
-#ifdef CONFIG_SWIOTLB
void arch_sync_dma_for_device(phys_addr_t paddr, size_t size,
enum dma_data_direction dir)
{
@@ -2324,4 +1990,3 @@ void arch_dma_free(struct device *dev, size_t size, void *cpu_addr,
{
__arm_dma_free(dev, size, cpu_addr, dma_handle, attrs, false);
}
-#endif /* CONFIG_SWIOTLB */