From 01573e231f18eb2d99162747186f59511f56b64d Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Fri, 08 Dec 2023 10:40:48 +0000
Subject: [PATCH] 移去rt
---
kernel/include/linux/dma-direct.h | 159 ++++++++++++++++++++++++++++++++++++++++------------
1 files changed, 122 insertions(+), 37 deletions(-)
diff --git a/kernel/include/linux/dma-direct.h b/kernel/include/linux/dma-direct.h
index 8d9f33f..80f0dba 100644
--- a/kernel/include/linux/dma-direct.h
+++ b/kernel/include/linux/dma-direct.h
@@ -1,69 +1,154 @@
/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Internals of the DMA direct mapping implementation. Only for use by the
+ * DMA mapping code and IOMMU drivers.
+ */
#ifndef _LINUX_DMA_DIRECT_H
#define _LINUX_DMA_DIRECT_H 1
#include <linux/dma-mapping.h>
+#include <linux/dma-map-ops.h>
+#include <linux/memblock.h> /* for min_low_pfn */
#include <linux/mem_encrypt.h>
+#include <linux/swiotlb.h>
+
+extern unsigned int zone_dma_bits;
+
+/*
+ * Record the mapping of CPU physical to DMA addresses for a given region.
+ */
+struct bus_dma_region {
+ phys_addr_t cpu_start;
+ dma_addr_t dma_start;
+ u64 size;
+ u64 offset;
+};
+
+static inline bool zone_dma32_is_empty(int node)
+{
+#ifdef CONFIG_ZONE_DMA32
+ pg_data_t *pgdat = NODE_DATA(node);
+
+ return zone_is_empty(&pgdat->node_zones[ZONE_DMA32]);
+#else
+ return true;
+#endif
+}
+
+static inline bool zone_dma32_are_empty(void)
+{
+#ifdef CONFIG_NUMA
+ int node;
+
+ for_each_node(node)
+ if (!zone_dma32_is_empty(node))
+ return false;
+#else
+ if (!zone_dma32_is_empty(numa_node_id()))
+ return false;
+#endif
+
+ return true;
+}
+
+static inline dma_addr_t translate_phys_to_dma(struct device *dev,
+ phys_addr_t paddr)
+{
+ const struct bus_dma_region *m;
+
+ for (m = dev->dma_range_map; m->size; m++)
+ if (paddr >= m->cpu_start && paddr - m->cpu_start < m->size)
+ return (dma_addr_t)paddr - m->offset;
+
+ /* make sure dma_capable fails when no translation is available */
+ return DMA_MAPPING_ERROR;
+}
+
+static inline phys_addr_t translate_dma_to_phys(struct device *dev,
+ dma_addr_t dma_addr)
+{
+ const struct bus_dma_region *m;
+
+ for (m = dev->dma_range_map; m->size; m++)
+ if (dma_addr >= m->dma_start && dma_addr - m->dma_start < m->size)
+ return (phys_addr_t)dma_addr + m->offset;
+
+ return (phys_addr_t)-1;
+}
#ifdef CONFIG_ARCH_HAS_PHYS_TO_DMA
#include <asm/dma-direct.h>
+#ifndef phys_to_dma_unencrypted
+#define phys_to_dma_unencrypted phys_to_dma
+#endif
#else
-static inline dma_addr_t __phys_to_dma(struct device *dev, phys_addr_t paddr)
+static inline dma_addr_t phys_to_dma_unencrypted(struct device *dev,
+ phys_addr_t paddr)
{
- dma_addr_t dev_addr = (dma_addr_t)paddr;
-
- return dev_addr - ((dma_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
+ if (dev->dma_range_map)
+ return translate_phys_to_dma(dev, paddr);
+ return paddr;
}
-
-static inline phys_addr_t __dma_to_phys(struct device *dev, dma_addr_t dev_addr)
-{
- phys_addr_t paddr = (phys_addr_t)dev_addr;
-
- return paddr + ((phys_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
-}
-
-static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
-{
- if (!dev->dma_mask)
- return false;
-
- return addr + size - 1 <= *dev->dma_mask;
-}
-#endif /* !CONFIG_ARCH_HAS_PHYS_TO_DMA */
/*
* If memory encryption is supported, phys_to_dma will set the memory encryption
- * bit in the DMA address, and dma_to_phys will clear it. The raw __phys_to_dma
- * and __dma_to_phys versions should only be used on non-encrypted memory for
- * special occasions like DMA coherent buffers.
+ * bit in the DMA address, and dma_to_phys will clear it.
+ * phys_to_dma_unencrypted is for use on special unencrypted memory like swiotlb
+ * buffers.
*/
static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
{
- return __sme_set(__phys_to_dma(dev, paddr));
+ return __sme_set(phys_to_dma_unencrypted(dev, paddr));
}
-static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t daddr)
+static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dma_addr)
{
- return __sme_clr(__dma_to_phys(dev, daddr));
-}
+ phys_addr_t paddr;
-#ifdef CONFIG_ARCH_HAS_DMA_MARK_CLEAN
-void dma_mark_clean(void *addr, size_t size);
+ if (dev->dma_range_map)
+ paddr = translate_dma_to_phys(dev, dma_addr);
+ else
+ paddr = dma_addr;
+
+ return __sme_clr(paddr);
+}
+#endif /* !CONFIG_ARCH_HAS_PHYS_TO_DMA */
+
+#ifdef CONFIG_ARCH_HAS_FORCE_DMA_UNENCRYPTED
+bool force_dma_unencrypted(struct device *dev);
#else
-static inline void dma_mark_clean(void *addr, size_t size)
+static inline bool force_dma_unencrypted(struct device *dev)
{
+ return false;
}
-#endif /* CONFIG_ARCH_HAS_DMA_MARK_CLEAN */
+#endif /* CONFIG_ARCH_HAS_FORCE_DMA_UNENCRYPTED */
+static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size,
+ bool is_ram)
+{
+ dma_addr_t end = addr + size - 1;
+
+ if (addr == DMA_MAPPING_ERROR)
+ return false;
+ if (is_ram && !IS_ENABLED(CONFIG_ARCH_DMA_ADDR_T_64BIT) &&
+ min(addr, end) < phys_to_dma(dev, PFN_PHYS(min_low_pfn)))
+ return false;
+
+ return end <= min_not_zero(*dev->dma_mask, dev->bus_dma_limit);
+}
+
+u64 dma_direct_get_required_mask(struct device *dev);
void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
gfp_t gfp, unsigned long attrs);
void dma_direct_free(struct device *dev, size_t size, void *cpu_addr,
dma_addr_t dma_addr, unsigned long attrs);
-dma_addr_t dma_direct_map_page(struct device *dev, struct page *page,
- unsigned long offset, size_t size, enum dma_data_direction dir,
- unsigned long attrs);
-int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl, int nents,
- enum dma_data_direction dir, unsigned long attrs);
+struct page *dma_direct_alloc_pages(struct device *dev, size_t size,
+ dma_addr_t *dma_handle, enum dma_data_direction dir, gfp_t gfp);
+void dma_direct_free_pages(struct device *dev, size_t size,
+ struct page *page, dma_addr_t dma_addr,
+ enum dma_data_direction dir);
int dma_direct_supported(struct device *dev, u64 mask);
-int dma_direct_mapping_error(struct device *dev, dma_addr_t dma_addr);
+dma_addr_t dma_direct_map_resource(struct device *dev, phys_addr_t paddr,
+ size_t size, enum dma_data_direction dir, unsigned long attrs);
+
#endif /* _LINUX_DMA_DIRECT_H */
--
Gitblit v1.6.2