search for: offset_in_page

Hello, On (03/30/16 16:12), Minchan Kim wrote: [..] > +static void objidx_to_page_and_offset(struct size_class *class, > + struct page *first_page, > + unsigned long obj_idx, > + struct page **obj_page, > + unsigned long *offset_in_page) > { > - unsigned long obj; > + int i; > + unsigned long offset; > + struct page *cursor; > + int nr_page; > > - if (!page) { > - VM_BUG_ON(obj_idx); > - return NULL; > - } > + offset = obj_idx * class->size; so we already know the `offset' before we...

Hello, On (03/30/16 16:12), Minchan Kim wrote: [..] > +static void objidx_to_page_and_offset(struct size_class *class, > + struct page *first_page, > + unsigned long obj_idx, > + struct page **obj_page, > + unsigned long *offset_in_page) > { > - unsigned long obj; > + int i; > + unsigned long offset; > + struct page *cursor; > + int nr_page; > > - if (!page) { > - VM_BUG_ON(obj_idx); > - return NULL; > - } > + offset = obj_idx * class->size; so we already know the `offset' before we...

...a_buf); kmem_cache_free(vgdev->vbufs, vbuf); } @@ -251,13 +251,70 @@ void virtio_gpu_dequeue_cursor_func(struct work_struct *work) wake_up(&vgdev->cursorq.ack_queue); } +/* How many bytes left in this page. */ +static unsigned int rest_of_page(void *data) +{ + return PAGE_SIZE - offset_in_page(data); +} + +/* Create sg_table from a vmalloc'd buffer. */ +static struct sg_table *vmalloc_to_sgt(char *data, uint32_t size, int *sg_ents) +{ + int nents, ret, s, i; + struct sg_table *sgt; + struct scatterlist *sg; + struct page *pg; + + *sg_ents = 0; + + sgt = kmalloc(sizeof(*sgt), GFP_KERN...

...a_buf); kmem_cache_free(vgdev->vbufs, vbuf); } @@ -251,13 +251,70 @@ void virtio_gpu_dequeue_cursor_func(struct work_struct *work) wake_up(&vgdev->cursorq.ack_queue); } +/* How many bytes left in this page. */ +static unsigned int rest_of_page(void *data) +{ + return PAGE_SIZE - offset_in_page(data); +} + +/* Create sg_table from a vmalloc'd buffer. */ +static struct sg_table *vmalloc_to_sgt(char *data, uint32_t size, int *sg_ents) +{ + int nents, ret, s, i; + struct sg_table *sgt; + struct scatterlist *sg; + struct page *pg; + + *sg_ents = 0; + + sgt = kmalloc(sizeof(*sgt), GFP_KERN...

...nd maybe we could have a better function name static unsigned long *map_handle(struct size_class *class, struct page *first_page, unsigned long obj_idx) { struct page *cursor = first_page; unsigned long offset = obj_idx * class->size; int nr_page = offset >> PAGE_SHIFT; unsigned long offset_in_page = offset & ~PAGE_MASK; void *addr; int i; if (class->huge) { VM_BUG_ON_PAGE(!is_first_page(page), page); return &page_private(page); } for (i = 0; i < nr_page; i++) cursor = get_next_page(cursor); addr = kmap_atomic(cursor); return addr + offset_in_page; } static vo...

...nd maybe we could have a better function name static unsigned long *map_handle(struct size_class *class, struct page *first_page, unsigned long obj_idx) { struct page *cursor = first_page; unsigned long offset = obj_idx * class->size; int nr_page = offset >> PAGE_SHIFT; unsigned long offset_in_page = offset & ~PAGE_MASK; void *addr; int i; if (class->huge) { VM_BUG_ON_PAGE(!is_first_page(page), page); return &page_private(page); } for (i = 0; i < nr_page; i++) cursor = get_next_page(cursor); addr = kmap_atomic(cursor); return addr + offset_in_page; } static vo...

...alloc because we can't DMA onto the stack any more?). We already have a few places which do handle sgs of vmalloced addresses, such as the nx crypto driver: if (is_vmalloc_addr(start_addr)) sg_addr = page_to_phys(vmalloc_to_page(start_addr)) + offset_in_page(sg_addr); else sg_addr = __pa(sg_addr); and videobuf: pg = vmalloc_to_page(virt); if (NULL == pg) goto err; BUG_ON(page_to_pfn(pg) >= (1 << (32 - PAGE_SHIFT))); sg_set_page(&am...

...alloc because we can't DMA onto the stack any more?). We already have a few places which do handle sgs of vmalloced addresses, such as the nx crypto driver: if (is_vmalloc_addr(start_addr)) sg_addr = page_to_phys(vmalloc_to_page(start_addr)) + offset_in_page(sg_addr); else sg_addr = __pa(sg_addr); and videobuf: pg = vmalloc_to_page(virt); if (NULL == pg) goto err; BUG_ON(page_to_pfn(pg) >= (1 << (32 - PAGE_SHIFT))); sg_set_page(&am...

Hi again all, It turns out that networking really wants ordered requests, which the previous patches didn't allow. This patch changes it to a callback mechanism; kudos to Avi. The downside is that locking is more complicated, and after a few dead ends I implemented the simplest solution: the struct virtio_device contains the spinlock to use, and it's held when your callbacks get

Hi again all, It turns out that networking really wants ordered requests, which the previous patches didn't allow. This patch changes it to a callback mechanism; kudos to Avi. The downside is that locking is more complicated, and after a few dead ends I implemented the simplest solution: the struct virtio_device contains the spinlock to use, and it's held when your callbacks get

Hi again all, It turns out that networking really wants ordered requests, which the previous patches didn't allow. This patch changes it to a callback mechanism; kudos to Avi. The downside is that locking is more complicated, and after a few dead ends I implemented the simplest solution: the struct virtio_device contains the spinlock to use, and it's held when your callbacks get

> +/* How many bytes left in this page. */ > +static unsigned int rest_of_page(void *data) > +{ > + return PAGE_SIZE - offset_in_page(data); > +} Not needed. > +/* Create sg_table from a vmalloc'd buffer. */ > +static struct sg_table *vmalloc_to_sgt(char *data, uint32_t size, int *sg_ents) > +{ > + int nents, ret, s, i; > + struct sg_table *sgt; > + struct scatterlist *sg; > + struct page *pg; > +...

On (03/11/16 16:30), Minchan Kim wrote: > -static void *location_to_obj(struct page *page, unsigned long obj_idx) > +static void objidx_to_page_and_ofs(struct size_class *class, > + struct page *first_page, > + unsigned long obj_idx, > + struct page **obj_page, > + unsigned long *ofs_in_page) this looks big; 5 params, function "returning" both page and

On (03/11/16 16:30), Minchan Kim wrote: > -static void *location_to_obj(struct page *page, unsigned long obj_idx) > +static void objidx_to_page_and_ofs(struct size_class *class, > + struct page *first_page, > + unsigned long obj_idx, > + struct page **obj_page, > + unsigned long *ofs_in_page) this looks big; 5 params, function "returning" both page and

...>+ if (free_space < iov_iter->count) >+ return -1; >+ >+ for (pages = 0, i = 0; i < iov_iter->nr_segs; i++) { >+ const struct iovec *iovec; >+ int pages_in_elem; >+ >+ iovec = &iov_iter->iov[i]; >+ >+ /* Base must be page aligned. */ >+ if (offset_in_page(iovec->iov_base)) >+ return -1; >+ >+ /* Only last element could have not page aligned size. */ >+ if (i != (iov_iter->nr_segs - 1)) { >+ if (offset_in_page(iovec->iov_len)) >+ return -1; >+ >+ pages_in_elem = iovec->iov_len >> PAGE_SHIFT; >+...

...-netfront.c > index fa67905..db638b4 100644 > --- a/drivers/net/xen-netfront.c > +++ b/drivers/net/xen-netfront.c > @@ -489,6 +489,7 @@ static int xennet_start_xmit(struct sk_buff *skb, struct net_device *dev) > int frags = skb_shinfo(skb)->nr_frags; > unsigned int offset = offset_in_page(data); > unsigned int len = skb_headlen(skb); > + unsigned long flags; > > frags += DIV_ROUND_UP(offset + len, PAGE_SIZE); > if (unlikely(frags > MAX_SKB_FRAGS + 1)) { > @@ -498,12 +499,12 @@ static int xennet_start_xmit(struct sk_buff *skb, struct net_device *dev) >...

...void *addr, unsigned int length, > > > + enum dma_data_direction dir) > > > +{ > > > + struct page *page; > > > + size_t offset; > > > + > > > + page = virt_to_page(addr); > > > + offset = offset_in_page(addr); > > > + > > > + return virtio_dma_map_page(dev, page, offset, length, dir); > > > +} > > > +EXPORT_SYMBOL_GPL(virtio_dma_map); > > > + > > > +/** > > > + * virtio_dma_mapping_error - check dma address > > > + * @de...

...void *addr, unsigned int length, > > > + enum dma_data_direction dir) > > > +{ > > > + struct page *page; > > > + size_t offset; > > > + > > > + page = virt_to_page(addr); > > > + offset = offset_in_page(addr); > > > + > > > + return virtio_dma_map_page(dev, page, offset, length, dir); > > > +} > > > +EXPORT_SYMBOL_GPL(virtio_dma_map); > > > + > > > +/** > > > + * virtio_dma_mapping_error - check dma address > > > + * @de...

...ck_size; + + range[n].reserved = cpu_to_le32(0); + range[n].nlba = cpu_to_le32(nlb); + range[n].slba = cpu_to_le64(slba); + n++; + } + + if (WARN_ON_ONCE(n != segments)) { + kfree(range); + return -1; + } + + req->special_vec.bv_page = virt_to_page(range); + req->special_vec.bv_offset = offset_in_page(range); + req->special_vec.bv_len = sizeof(*range) * segments; + req->rq_flags |= RQF_SPECIAL_PAYLOAD; + + return 0; +} + static inline void virtblk_request_done(struct request *req) { struct virtblk_req *vbr = blk_mq_rq_to_pdu(req); + if (req->rq_flags & RQF_SPECIAL_PAYLOAD) { +...

...ck_size; + + range[n].reserved = cpu_to_le32(0); + range[n].nlba = cpu_to_le32(nlb); + range[n].slba = cpu_to_le64(slba); + n++; + } + + if (WARN_ON_ONCE(n != segments)) { + kfree(range); + return -1; + } + + req->special_vec.bv_page = virt_to_page(range); + req->special_vec.bv_offset = offset_in_page(range); + req->special_vec.bv_len = sizeof(*range) * segments; + req->rq_flags |= RQF_SPECIAL_PAYLOAD; + + return 0; +} + static inline void virtblk_request_done(struct request *req) { struct virtblk_req *vbr = blk_mq_rq_to_pdu(req); + if (req->rq_flags & RQF_SPECIAL_PAYLOAD) { +...