Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755570AbaJWQUl (ORCPT ); Thu, 23 Oct 2014 12:20:41 -0400 Received: from mx1.redhat.com ([209.132.183.28]:42118 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752671AbaJWQUj (ORCPT ); Thu, 23 Oct 2014 12:20:39 -0400 Date: Thu, 23 Oct 2014 19:24:08 +0300 From: "Michael S. Tsirkin" To: linux-kernel@vger.kernel.org Cc: Rusty Russell , virtualization@lists.linux-foundation.org Subject: [PATCH RFC v4 02/17] virtio_ring: switch to new memory access APIs Message-ID: <1414081380-14623-3-git-send-email-mst@redhat.com> References: <1414081380-14623-1-git-send-email-mst@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1414081380-14623-1-git-send-email-mst@redhat.com> X-Mutt-Fcc: =sent Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Use virtioXX_to_cpu and friends for access to all multibyte structures in memory. Note: this is intentionally mechanical. A follow-up patch will split long lines etc. Signed-off-by: Michael S. Tsirkin --- drivers/virtio/virtio_ring.c | 89 ++++++++++++++++++++++---------------------- 1 file changed, 45 insertions(+), 44 deletions(-) diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 3b1f89b..048e1bc 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -99,7 +99,8 @@ struct vring_virtqueue #define to_vvq(_vq) container_of(_vq, struct vring_virtqueue, vq) -static struct vring_desc *alloc_indirect(unsigned int total_sg, gfp_t gfp) +static struct vring_desc *alloc_indirect(struct virtqueue *_vq, + unsigned int total_sg, gfp_t gfp) { struct vring_desc *desc; unsigned int i; @@ -116,7 +117,7 @@ static struct vring_desc *alloc_indirect(unsigned int total_sg, gfp_t gfp) return NULL; for (i = 0; i < total_sg; i++) - desc[i].next = i+1; + desc[i].next = cpu_to_virtio16(_vq->vdev, i + 1); return desc; } @@ -165,17 +166,17 @@ static inline int virtqueue_add(struct virtqueue *_vq, /* If the host supports indirect descriptor tables, and we have multiple * buffers, then go indirect. FIXME: tune this threshold */ if (vq->indirect && total_sg > 1 && vq->vq.num_free) - desc = alloc_indirect(total_sg, gfp); + desc = alloc_indirect(_vq, total_sg, gfp); else desc = NULL; if (desc) { /* Use a single buffer which doesn't continue */ - vq->vring.desc[head].flags = VRING_DESC_F_INDIRECT; - vq->vring.desc[head].addr = virt_to_phys(desc); + vq->vring.desc[head].flags = cpu_to_virtio16(_vq->vdev, VRING_DESC_F_INDIRECT); + vq->vring.desc[head].addr = cpu_to_virtio64(_vq->vdev, virt_to_phys(desc)); /* avoid kmemleak false positive (hidden by virt_to_phys) */ kmemleak_ignore(desc); - vq->vring.desc[head].len = total_sg * sizeof(struct vring_desc); + vq->vring.desc[head].len = cpu_to_virtio32(_vq->vdev, total_sg * sizeof(struct vring_desc)); /* Set up rest to use this indirect table. */ i = 0; @@ -205,28 +206,28 @@ static inline int virtqueue_add(struct virtqueue *_vq, for (n = 0; n < out_sgs; n++) { for (sg = sgs[n]; sg; sg = sg_next(sg)) { - desc[i].flags = VRING_DESC_F_NEXT; - desc[i].addr = sg_phys(sg); - desc[i].len = sg->length; + desc[i].flags = cpu_to_virtio16(_vq->vdev, VRING_DESC_F_NEXT); + desc[i].addr = cpu_to_virtio64(_vq->vdev, sg_phys(sg)); + desc[i].len = cpu_to_virtio32(_vq->vdev, sg->length); prev = i; - i = desc[i].next; + i = virtio16_to_cpu(_vq->vdev, desc[i].next); } } for (; n < (out_sgs + in_sgs); n++) { for (sg = sgs[n]; sg; sg = sg_next(sg)) { - desc[i].flags = VRING_DESC_F_NEXT|VRING_DESC_F_WRITE; - desc[i].addr = sg_phys(sg); - desc[i].len = sg->length; + desc[i].flags = cpu_to_virtio16(_vq->vdev, VRING_DESC_F_NEXT | VRING_DESC_F_WRITE); + desc[i].addr = cpu_to_virtio64(_vq->vdev, sg_phys(sg)); + desc[i].len = cpu_to_virtio32(_vq->vdev, sg->length); prev = i; - i = desc[i].next; + i = virtio16_to_cpu(_vq->vdev, desc[i].next); } } /* Last one doesn't continue. */ - desc[prev].flags &= ~VRING_DESC_F_NEXT; + desc[prev].flags &= cpu_to_virtio16(_vq->vdev, ~VRING_DESC_F_NEXT); /* Update free pointer */ if (indirect) - vq->free_head = vq->vring.desc[head].next; + vq->free_head = virtio16_to_cpu(_vq->vdev, vq->vring.desc[head].next); else vq->free_head = i; @@ -235,13 +236,13 @@ static inline int virtqueue_add(struct virtqueue *_vq, /* Put entry in available array (but don't update avail->idx until they * do sync). */ - avail = (vq->vring.avail->idx & (vq->vring.num-1)); - vq->vring.avail->ring[avail] = head; + avail = virtio16_to_cpu(_vq->vdev, vq->vring.avail->idx) & (vq->vring.num - 1); + vq->vring.avail->ring[avail] = cpu_to_virtio16(_vq->vdev, head); /* Descriptors and available array need to be set before we expose the * new available array entries. */ virtio_wmb(vq->weak_barriers); - vq->vring.avail->idx++; + vq->vring.avail->idx = cpu_to_virtio16(_vq->vdev, virtio16_to_cpu(_vq->vdev, vq->vring.avail->idx) + 1); vq->num_added++; /* This is very unlikely, but theoretically possible. Kick @@ -354,8 +355,8 @@ bool virtqueue_kick_prepare(struct virtqueue *_vq) * event. */ virtio_mb(vq->weak_barriers); - old = vq->vring.avail->idx - vq->num_added; - new = vq->vring.avail->idx; + old = virtio16_to_cpu(_vq->vdev, vq->vring.avail->idx) - vq->num_added; + new = virtio16_to_cpu(_vq->vdev, vq->vring.avail->idx); vq->num_added = 0; #ifdef DEBUG @@ -367,10 +368,10 @@ bool virtqueue_kick_prepare(struct virtqueue *_vq) #endif if (vq->event) { - needs_kick = vring_need_event(vring_avail_event(&vq->vring), + needs_kick = vring_need_event(virtio16_to_cpu(_vq->vdev, vring_avail_event(&vq->vring)), new, old); } else { - needs_kick = !(vq->vring.used->flags & VRING_USED_F_NO_NOTIFY); + needs_kick = !(vq->vring.used->flags & cpu_to_virtio16(_vq->vdev, VRING_USED_F_NO_NOTIFY)); } END_USE(vq); return needs_kick; @@ -432,15 +433,15 @@ static void detach_buf(struct vring_virtqueue *vq, unsigned int head) i = head; /* Free the indirect table */ - if (vq->vring.desc[i].flags & VRING_DESC_F_INDIRECT) - kfree(phys_to_virt(vq->vring.desc[i].addr)); + if (vq->vring.desc[i].flags & cpu_to_virtio16(vq->vq.vdev, VRING_DESC_F_INDIRECT)) + kfree(phys_to_virt(virtio64_to_cpu(vq->vq.vdev, vq->vring.desc[i].addr))); - while (vq->vring.desc[i].flags & VRING_DESC_F_NEXT) { - i = vq->vring.desc[i].next; + while (vq->vring.desc[i].flags & cpu_to_virtio16(vq->vq.vdev, VRING_DESC_F_NEXT)) { + i = virtio16_to_cpu(vq->vq.vdev, vq->vring.desc[i].next); vq->vq.num_free++; } - vq->vring.desc[i].next = vq->free_head; + vq->vring.desc[i].next = cpu_to_virtio16(vq->vq.vdev, vq->free_head); vq->free_head = head; /* Plus final descriptor */ vq->vq.num_free++; @@ -448,7 +449,7 @@ static void detach_buf(struct vring_virtqueue *vq, unsigned int head) static inline bool more_used(const struct vring_virtqueue *vq) { - return vq->last_used_idx != vq->vring.used->idx; + return vq->last_used_idx != virtio16_to_cpu(vq->vq.vdev, vq->vring.used->idx); } /** @@ -491,8 +492,8 @@ void *virtqueue_get_buf(struct virtqueue *_vq, unsigned int *len) virtio_rmb(vq->weak_barriers); last_used = (vq->last_used_idx & (vq->vring.num - 1)); - i = vq->vring.used->ring[last_used].id; - *len = vq->vring.used->ring[last_used].len; + i = virtio32_to_cpu(_vq->vdev, vq->vring.used->ring[last_used].id); + *len = virtio32_to_cpu(_vq->vdev, vq->vring.used->ring[last_used].len); if (unlikely(i >= vq->vring.num)) { BAD_RING(vq, "id %u out of range\n", i); @@ -510,8 +511,8 @@ void *virtqueue_get_buf(struct virtqueue *_vq, unsigned int *len) /* If we expect an interrupt for the next entry, tell host * by writing event index and flush out the write before * the read in the next get_buf call. */ - if (!(vq->vring.avail->flags & VRING_AVAIL_F_NO_INTERRUPT)) { - vring_used_event(&vq->vring) = vq->last_used_idx; + if (!(vq->vring.avail->flags & cpu_to_virtio16(_vq->vdev, VRING_AVAIL_F_NO_INTERRUPT))) { + vring_used_event(&vq->vring) = cpu_to_virtio16(_vq->vdev, vq->last_used_idx); virtio_mb(vq->weak_barriers); } @@ -537,7 +538,7 @@ void virtqueue_disable_cb(struct virtqueue *_vq) { struct vring_virtqueue *vq = to_vvq(_vq); - vq->vring.avail->flags |= VRING_AVAIL_F_NO_INTERRUPT; + vq->vring.avail->flags |= cpu_to_virtio16(_vq->vdev, VRING_AVAIL_F_NO_INTERRUPT); } EXPORT_SYMBOL_GPL(virtqueue_disable_cb); @@ -565,8 +566,8 @@ unsigned virtqueue_enable_cb_prepare(struct virtqueue *_vq) /* Depending on the VIRTIO_RING_F_EVENT_IDX feature, we need to * either clear the flags bit or point the event index at the next * entry. Always do both to keep code simple. */ - vq->vring.avail->flags &= ~VRING_AVAIL_F_NO_INTERRUPT; - vring_used_event(&vq->vring) = last_used_idx = vq->last_used_idx; + vq->vring.avail->flags &= cpu_to_virtio16(_vq->vdev, ~VRING_AVAIL_F_NO_INTERRUPT); + vring_used_event(&vq->vring) = cpu_to_virtio16(_vq->vdev, last_used_idx = vq->last_used_idx); END_USE(vq); return last_used_idx; } @@ -586,7 +587,7 @@ bool virtqueue_poll(struct virtqueue *_vq, unsigned last_used_idx) struct vring_virtqueue *vq = to_vvq(_vq); virtio_mb(vq->weak_barriers); - return (u16)last_used_idx != vq->vring.used->idx; + return (u16)last_used_idx != virtio16_to_cpu(_vq->vdev, vq->vring.used->idx); } EXPORT_SYMBOL_GPL(virtqueue_poll); @@ -633,12 +634,12 @@ bool virtqueue_enable_cb_delayed(struct virtqueue *_vq) /* Depending on the VIRTIO_RING_F_USED_EVENT_IDX feature, we need to * either clear the flags bit or point the event index at the next * entry. Always do both to keep code simple. */ - vq->vring.avail->flags &= ~VRING_AVAIL_F_NO_INTERRUPT; + vq->vring.avail->flags &= cpu_to_virtio16(_vq->vdev, ~VRING_AVAIL_F_NO_INTERRUPT); /* TODO: tune this threshold */ - bufs = (u16)(vq->vring.avail->idx - vq->last_used_idx) * 3 / 4; - vring_used_event(&vq->vring) = vq->last_used_idx + bufs; + bufs = (u16)(virtio16_to_cpu(_vq->vdev, vq->vring.avail->idx) - vq->last_used_idx) * 3 / 4; + vring_used_event(&vq->vring) = cpu_to_virtio16(_vq->vdev, vq->last_used_idx + bufs); virtio_mb(vq->weak_barriers); - if (unlikely((u16)(vq->vring.used->idx - vq->last_used_idx) > bufs)) { + if (unlikely((u16)(virtio16_to_cpu(_vq->vdev, vq->vring.used->idx) - vq->last_used_idx) > bufs)) { END_USE(vq); return false; } @@ -670,7 +671,7 @@ void *virtqueue_detach_unused_buf(struct virtqueue *_vq) /* detach_buf clears data, so grab it now. */ buf = vq->data[i]; detach_buf(vq, i); - vq->vring.avail->idx--; + vq->vring.avail->idx = cpu_to_virtio16(_vq->vdev, virtio16_to_cpu(_vq->vdev, vq->vring.avail->idx) - 1); END_USE(vq); return buf; } @@ -747,12 +748,12 @@ struct virtqueue *vring_new_virtqueue(unsigned int index, /* No callback? Tell other side not to bother us. */ if (!callback) - vq->vring.avail->flags |= VRING_AVAIL_F_NO_INTERRUPT; + vq->vring.avail->flags |= cpu_to_virtio16(vdev, VRING_AVAIL_F_NO_INTERRUPT); /* Put everything in free lists. */ vq->free_head = 0; for (i = 0; i < num-1; i++) { - vq->vring.desc[i].next = i+1; + vq->vring.desc[i].next = cpu_to_virtio16(vdev, i + 1); vq->data[i] = NULL; } vq->data[i] = NULL; -- MST -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/