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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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ae376910f5
when we build tools/virtio, meet below error information.
cc -g -O2 -Werror -Wno-maybe-uninitialized -Wall -I. -I../include/
-I ../../usr/include/ -Wno-pointer-sign -fno-strict-overflow
-fno-strict-aliasing -fno-common -MMD
-U_FORTIFY_SOURCE -include ../../include/linux/kconfig.h
-mfunction-return=thunk
-fcf-protection=none -mindirect-branch-register -pthread
-c -o virtio_ring.o ../../drivers/virtio/virtio_ring.c
../../drivers/virtio/virtio_ring.c: in function 'vring_need_unmap_buffer':
../../drivers/virtio/virtio_ring.c:294:54: error:'DMA_MAPPING_ERROR'Undeclared (first use within this function)
294 | return vring->use_dma_api && (extra->addr != DMA_MAPPING_ERROR);
| ^~~~~~~~~~~~~~~~~
../../drivers/virtio/virtio_ring.c:294:54: Note: Each undeclared identifier is only reported once within the function it appears in
../../drivers/virtio/virtio_ring.c: in function 'vring_map_one_sg':
../../drivers/virtio/virtio_ring.c:369:24: error：Implicit declaration function'sg_dma_len' [-Wimplicit-function-declaration]
369 | *len = sg_dma_len(sg);
| ^~~~~~~~~~
../../drivers/virtio/virtio_ring.c: in function'virtqueue_add_desc_split':
../../drivers/virtio/virtio_ring.c:518:37: error:'DMA_MAPPING_ERROR'Undeclared (first use within this function)
518 | extra[i].addr = premapped ? DMA_MAPPING_ERROR : addr;
| ^~~~~~~~~~~~~~~~~
../../drivers/virtio/virtio_ring.c: in function'virtqueue_add_indirect_packed':
../../drivers/virtio/virtio_ring.c:1370:61: error: 'DMA_MAPPING_ERROR'Undeclared (first use within this function)
1370 | extra[i].addr = premapped ? DMA_MAPPING_ERROR : addr;
| ^~~~~~~~~~~~~~~~~
../../drivers/virtio/virtio_ring.c: in function'virtqueue_add_packed':
../../drivers/virtio/virtio_ring.c:1535:41: error:'DMA_MAPPING_ERROR'Undeclared (first use within this function)
1535 | DMA_MAPPING_ERROR : addr;
| ^~~~~~~~~~~~~~~~~
to fix, add DMA_MAPPING_ERROR define for virtio test.
Fixes: c7e1b422af ("virtio_ring: perform premapped operations based on per-buffer")
Signed-off-by: Yufeng Wang <wangyufeng@kylinos.cn>
Message-Id: <20250113100300.174382-1-wangyufeng@kylinos.cn>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
60 lines
1.9 KiB
C
60 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_DMA_MAPPING_H
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#define _LINUX_DMA_MAPPING_H
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#ifdef CONFIG_HAS_DMA
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# error Virtio userspace code does not support CONFIG_HAS_DMA
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#endif
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enum dma_data_direction {
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DMA_BIDIRECTIONAL = 0,
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DMA_TO_DEVICE = 1,
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DMA_FROM_DEVICE = 2,
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DMA_NONE = 3,
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};
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#define dma_alloc_coherent(d, s, hp, f) ({ \
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void *__dma_alloc_coherent_p = kmalloc((s), (f)); \
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*(hp) = (unsigned long)__dma_alloc_coherent_p; \
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__dma_alloc_coherent_p; \
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})
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#define dma_free_coherent(d, s, p, h) kfree(p)
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#define dma_map_page(d, p, o, s, dir) (page_to_phys(p) + (o))
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#define dma_map_single(d, p, s, dir) (virt_to_phys(p))
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#define dma_map_single_attrs(d, p, s, dir, a) (virt_to_phys(p))
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#define dma_mapping_error(...) (0)
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#define dma_unmap_single(d, a, s, r) do { (void)(d); (void)(a); (void)(s); (void)(r); } while (0)
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#define dma_unmap_page(d, a, s, r) do { (void)(d); (void)(a); (void)(s); (void)(r); } while (0)
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#define sg_dma_address(sg) (0)
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#define sg_dma_len(sg) (0)
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#define dma_need_sync(v, a) (0)
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#define dma_unmap_single_attrs(d, a, s, r, t) do { \
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(void)(d); (void)(a); (void)(s); (void)(r); (void)(t); \
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} while (0)
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#define dma_sync_single_range_for_cpu(d, a, o, s, r) do { \
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(void)(d); (void)(a); (void)(o); (void)(s); (void)(r); \
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} while (0)
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#define dma_sync_single_range_for_device(d, a, o, s, r) do { \
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(void)(d); (void)(a); (void)(o); (void)(s); (void)(r); \
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} while (0)
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#define dma_max_mapping_size(...) SIZE_MAX
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/*
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* A dma_addr_t can hold any valid DMA or bus address for the platform. It can
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* be given to a device to use as a DMA source or target. It is specific to a
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* given device and there may be a translation between the CPU physical address
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* space and the bus address space.
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*
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* DMA_MAPPING_ERROR is the magic error code if a mapping failed. It should not
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* be used directly in drivers, but checked for using dma_mapping_error()
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* instead.
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*/
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#define DMA_MAPPING_ERROR (~(dma_addr_t)0)
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#endif
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