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author | Heiko Carstens <hca@linux.ibm.com> | 2024-03-07 15:28:14 +0300 |
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committer | Heiko Carstens <hca@linux.ibm.com> | 2024-03-13 11:23:47 +0300 |
commit | e1f51be68d9906e652d4678c4df1d34a9d8ad9ef (patch) | |
tree | ea3d9dc24199693e24bd6cd9235b65a2dba3f4b5 /arch/s390/include/asm/idals.h | |
parent | 0c9580cebb5065c7ef25d48f61222aaf46932a0f (diff) | |
download | linux-e1f51be68d9906e652d4678c4df1d34a9d8ad9ef.tar.xz |
s390/cio,idal: fix virtual vs physical address confusion
Fix virtual vs physical address confusion. This does not fix a bug since
virtual and physical address spaces are currently the same.
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Diffstat (limited to 'arch/s390/include/asm/idals.h')
-rw-r--r-- | arch/s390/include/asm/idals.h | 68 |
1 files changed, 45 insertions, 23 deletions
diff --git a/arch/s390/include/asm/idals.h b/arch/s390/include/asm/idals.h index 1ceefc9f6fbe..ac68c657b28c 100644 --- a/arch/s390/include/asm/idals.h +++ b/arch/s390/include/asm/idals.h @@ -18,6 +18,7 @@ #include <linux/types.h> #include <linux/slab.h> #include <linux/uaccess.h> +#include <asm/dma-types.h> #include <asm/cio.h> #define IDA_SIZE_SHIFT 12 @@ -31,7 +32,9 @@ */ static inline bool idal_is_needed(void *vaddr, unsigned int length) { - return ((__pa(vaddr) + length - 1) >> 31) != 0; + dma64_t paddr = virt_to_dma64(vaddr); + + return (((__force unsigned long)(paddr) + length - 1) >> 31) != 0; } /* @@ -63,16 +66,16 @@ static inline unsigned int idal_2k_nr_words(void *vaddr, unsigned int length) /* * Create the list of idal words for an address/length pair. */ -static inline unsigned long *idal_create_words(unsigned long *idaws, void *vaddr, unsigned int length) +static inline dma64_t *idal_create_words(dma64_t *idaws, void *vaddr, unsigned int length) { - unsigned long paddr = __pa(vaddr); + dma64_t paddr = virt_to_dma64(vaddr); unsigned int cidaw; *idaws++ = paddr; cidaw = idal_nr_words(vaddr, length); - paddr &= -IDA_BLOCK_SIZE; + paddr = dma64_and(paddr, -IDA_BLOCK_SIZE); while (--cidaw > 0) { - paddr += IDA_BLOCK_SIZE; + paddr = dma64_add(paddr, IDA_BLOCK_SIZE); *idaws++ = paddr; } return idaws; @@ -85,7 +88,7 @@ static inline unsigned long *idal_create_words(unsigned long *idaws, void *vaddr static inline int set_normalized_cda(struct ccw1 *ccw, void *vaddr) { unsigned int nridaws; - unsigned long *idal; + dma64_t *idal; if (ccw->flags & CCW_FLAG_IDA) return -EINVAL; @@ -98,7 +101,7 @@ static inline int set_normalized_cda(struct ccw1 *ccw, void *vaddr) ccw->flags |= CCW_FLAG_IDA; vaddr = idal; } - ccw->cda = (__u32)(unsigned long)vaddr; + ccw->cda = virt_to_dma32(vaddr); return 0; } @@ -108,7 +111,7 @@ static inline int set_normalized_cda(struct ccw1 *ccw, void *vaddr) static inline void clear_normalized_cda(struct ccw1 *ccw) { if (ccw->flags & CCW_FLAG_IDA) { - kfree((void *)(unsigned long)ccw->cda); + kfree(dma32_to_virt(ccw->cda)); ccw->flags &= ~CCW_FLAG_IDA; } ccw->cda = 0; @@ -120,7 +123,7 @@ static inline void clear_normalized_cda(struct ccw1 *ccw) struct idal_buffer { size_t size; size_t page_order; - void *data[]; + dma64_t data[]; }; /* @@ -130,6 +133,7 @@ static inline struct idal_buffer *idal_buffer_alloc(size_t size, int page_order) { int nr_chunks, nr_ptrs, i; struct idal_buffer *ib; + void *vaddr; nr_ptrs = (size + IDA_BLOCK_SIZE - 1) >> IDA_SIZE_SHIFT; nr_chunks = (PAGE_SIZE << page_order) >> IDA_SIZE_SHIFT; @@ -140,18 +144,20 @@ static inline struct idal_buffer *idal_buffer_alloc(size_t size, int page_order) ib->page_order = page_order; for (i = 0; i < nr_ptrs; i++) { if (i & (nr_chunks - 1)) { - ib->data[i] = ib->data[i - 1] + IDA_BLOCK_SIZE; + ib->data[i] = dma64_add(ib->data[i - 1], IDA_BLOCK_SIZE); continue; } - ib->data[i] = (void *)__get_free_pages(GFP_KERNEL, page_order); - if (!ib->data[i]) + vaddr = (void *)__get_free_pages(GFP_KERNEL, page_order); + if (!vaddr) goto error; + ib->data[i] = virt_to_dma64(vaddr); } return ib; error: while (i >= nr_chunks) { i -= nr_chunks; - free_pages((unsigned long)ib->data[i], ib->page_order); + vaddr = dma64_to_virt(ib->data[i]); + free_pages((unsigned long)vaddr, ib->page_order); } kfree(ib); return ERR_PTR(-ENOMEM); @@ -163,11 +169,14 @@ error: static inline void idal_buffer_free(struct idal_buffer *ib) { int nr_chunks, nr_ptrs, i; + void *vaddr; nr_ptrs = (ib->size + IDA_BLOCK_SIZE - 1) >> IDA_SIZE_SHIFT; nr_chunks = (PAGE_SIZE << ib->page_order) >> IDA_SIZE_SHIFT; - for (i = 0; i < nr_ptrs; i += nr_chunks) - free_pages((unsigned long)ib->data[i], ib->page_order); + for (i = 0; i < nr_ptrs; i += nr_chunks) { + vaddr = dma64_to_virt(ib->data[i]); + free_pages((unsigned long)vaddr, ib->page_order); + } kfree(ib); } @@ -178,7 +187,7 @@ static inline bool __idal_buffer_is_needed(struct idal_buffer *ib) { if (ib->size > (PAGE_SIZE << ib->page_order)) return true; - return idal_is_needed(ib->data[0], ib->size); + return idal_is_needed(dma64_to_virt(ib->data[0]), ib->size); } /* @@ -186,13 +195,20 @@ static inline bool __idal_buffer_is_needed(struct idal_buffer *ib) */ static inline void idal_buffer_set_cda(struct idal_buffer *ib, struct ccw1 *ccw) { + void *vaddr; + if (__idal_buffer_is_needed(ib)) { /* Setup idals */ - ccw->cda = (u32)(addr_t)ib->data; + ccw->cda = virt_to_dma32(ib->data); ccw->flags |= CCW_FLAG_IDA; } else { - /* No idals needed - use direct addressing. */ - ccw->cda = (u32)(addr_t)ib->data[0]; + /* + * No idals needed - use direct addressing. Convert from + * dma64_t to virt and then to dma32_t only because of type + * checking. The physical address is known to be below 2GB. + */ + vaddr = dma64_to_virt(ib->data[0]); + ccw->cda = virt_to_dma32(vaddr); } ccw->count = ib->size; } @@ -203,17 +219,20 @@ static inline void idal_buffer_set_cda(struct idal_buffer *ib, struct ccw1 *ccw) static inline size_t idal_buffer_to_user(struct idal_buffer *ib, void __user *to, size_t count) { size_t left; + void *vaddr; int i; BUG_ON(count > ib->size); for (i = 0; count > IDA_BLOCK_SIZE; i++) { - left = copy_to_user(to, ib->data[i], IDA_BLOCK_SIZE); + vaddr = dma64_to_virt(ib->data[i]); + left = copy_to_user(to, vaddr, IDA_BLOCK_SIZE); if (left) return left + count - IDA_BLOCK_SIZE; to = (void __user *)to + IDA_BLOCK_SIZE; count -= IDA_BLOCK_SIZE; } - return copy_to_user(to, ib->data[i], count); + vaddr = dma64_to_virt(ib->data[i]); + return copy_to_user(to, vaddr, count); } /* @@ -222,17 +241,20 @@ static inline size_t idal_buffer_to_user(struct idal_buffer *ib, void __user *to static inline size_t idal_buffer_from_user(struct idal_buffer *ib, const void __user *from, size_t count) { size_t left; + void *vaddr; int i; BUG_ON(count > ib->size); for (i = 0; count > IDA_BLOCK_SIZE; i++) { - left = copy_from_user(ib->data[i], from, IDA_BLOCK_SIZE); + vaddr = dma64_to_virt(ib->data[i]); + left = copy_from_user(vaddr, from, IDA_BLOCK_SIZE); if (left) return left + count - IDA_BLOCK_SIZE; from = (void __user *)from + IDA_BLOCK_SIZE; count -= IDA_BLOCK_SIZE; } - return copy_from_user(ib->data[i], from, count); + vaddr = dma64_to_virt(ib->data[i]); + return copy_from_user(vaddr, from, count); } #endif |