Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932100AbaJVPrn (ORCPT ); Wed, 22 Oct 2014 11:47:43 -0400 Received: from mx1.redhat.com ([209.132.183.28]:41898 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755281AbaJVPre (ORCPT ); Wed, 22 Oct 2014 11:47:34 -0400 Date: Wed, 22 Oct 2014 18:50:26 +0300 From: "Michael S. Tsirkin" To: linux-kernel@vger.kernel.org Cc: Rusty Russell , Brian Swetland , Christian Borntraeger , Cornelia Huck , Pawel Moll , Ohad Ben-Cohen , Arnd Bergmann , Greg Kroah-Hartman , Amit Shah , linux390@de.ibm.com, Martin Schwidefsky , Heiko Carstens , Heinz Graalfs , Joel Stanley , virtualization@lists.linux-foundation.org, lguest@lists.ozlabs.org, linux-s390@vger.kernel.org Subject: [PATCH RFC v2 04/16] virtio: add support for 64 bit features. Message-ID: <1413992894-22976-5-git-send-email-mst@redhat.com> References: <1413992894-22976-1-git-send-email-mst@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1413992894-22976-1-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 From: Rusty Russell Change the u32 to a u64, and make sure to use 1ULL everywhere! Cc: Brian Swetland Cc: Christian Borntraeger [Thomas Huth: fix up virtio-ccw get_features] Signed-off-by: Rusty Russell Signed-off-by: Cornelia Huck Acked-by: Pawel Moll Acked-by: Ohad Ben-Cohen Signed-off-by: Michael S. Tsirkin --- include/linux/virtio.h | 2 +- include/linux/virtio_config.h | 8 ++++---- tools/virtio/linux/virtio.h | 2 +- tools/virtio/linux/virtio_config.h | 2 +- drivers/char/virtio_console.c | 2 +- drivers/lguest/lguest_device.c | 10 +++++----- drivers/remoteproc/remoteproc_virtio.c | 5 ++++- drivers/s390/kvm/kvm_virtio.c | 10 +++++----- drivers/s390/kvm/virtio_ccw.c | 29 ++++++++++++++++++++++++----- drivers/virtio/virtio.c | 12 ++++++------ drivers/virtio/virtio_mmio.c | 14 +++++++++----- drivers/virtio/virtio_pci.c | 5 ++--- drivers/virtio/virtio_ring.c | 2 +- 13 files changed, 64 insertions(+), 39 deletions(-) diff --git a/include/linux/virtio.h b/include/linux/virtio.h index 7828a7f..149284e 100644 --- a/include/linux/virtio.h +++ b/include/linux/virtio.h @@ -101,7 +101,7 @@ struct virtio_device { const struct virtio_config_ops *config; const struct vringh_config_ops *vringh_config; struct list_head vqs; - u32 features; + u64 features; void *priv; }; diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h index 946bed7..7d46280 100644 --- a/include/linux/virtio_config.h +++ b/include/linux/virtio_config.h @@ -67,7 +67,7 @@ struct virtio_config_ops { vq_callback_t *callbacks[], const char *names[]); void (*del_vqs)(struct virtio_device *); - u32 (*get_features)(struct virtio_device *vdev); + u64 (*get_features)(struct virtio_device *vdev); void (*finalize_features)(struct virtio_device *vdev); const char *(*bus_name)(struct virtio_device *vdev); int (*set_vq_affinity)(struct virtqueue *vq, int cpu); @@ -87,14 +87,14 @@ static inline bool virtio_has_feature(const struct virtio_device *vdev, { /* Did you forget to fix assumptions on max features? */ if (__builtin_constant_p(fbit)) - BUILD_BUG_ON(fbit >= 32); + BUILD_BUG_ON(fbit >= 64); else - BUG_ON(fbit >= 32); + BUG_ON(fbit >= 64); if (fbit < VIRTIO_TRANSPORT_F_START) virtio_check_driver_offered_feature(vdev, fbit); - return vdev->features & (1 << fbit); + return vdev->features & (1ULL << fbit); } static inline diff --git a/tools/virtio/linux/virtio.h b/tools/virtio/linux/virtio.h index 72bff70..8eb6421 100644 --- a/tools/virtio/linux/virtio.h +++ b/tools/virtio/linux/virtio.h @@ -10,7 +10,7 @@ struct virtio_device { void *dev; - u32 features; + u64 features; }; struct virtqueue { diff --git a/tools/virtio/linux/virtio_config.h b/tools/virtio/linux/virtio_config.h index 1f1636b..a254c2b 100644 --- a/tools/virtio/linux/virtio_config.h +++ b/tools/virtio/linux/virtio_config.h @@ -2,5 +2,5 @@ #define VIRTIO_TRANSPORT_F_END 32 #define virtio_has_feature(dev, feature) \ - ((dev)->features & (1 << feature)) + ((dev)->features & (1ULL << feature)) diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c index d79baf0..1690b2a 100644 --- a/drivers/char/virtio_console.c +++ b/drivers/char/virtio_console.c @@ -355,7 +355,7 @@ static inline bool use_multiport(struct ports_device *portdev) */ if (!portdev->vdev) return 0; - return portdev->vdev->features & (1 << VIRTIO_CONSOLE_F_MULTIPORT); + return portdev->vdev->features & (1ULL << VIRTIO_CONSOLE_F_MULTIPORT); } static DEFINE_SPINLOCK(dma_bufs_lock); diff --git a/drivers/lguest/lguest_device.c b/drivers/lguest/lguest_device.c index c831c47..4d29bcd 100644 --- a/drivers/lguest/lguest_device.c +++ b/drivers/lguest/lguest_device.c @@ -94,17 +94,17 @@ static unsigned desc_size(const struct lguest_device_desc *desc) } /* This gets the device's feature bits. */ -static u32 lg_get_features(struct virtio_device *vdev) +static u64 lg_get_features(struct virtio_device *vdev) { unsigned int i; - u32 features = 0; + u64 features = 0; struct lguest_device_desc *desc = to_lgdev(vdev)->desc; u8 *in_features = lg_features(desc); /* We do this the slow but generic way. */ - for (i = 0; i < min(desc->feature_len * 8, 32); i++) + for (i = 0; i < min(desc->feature_len * 8, 64); i++) if (in_features[i / 8] & (1 << (i % 8))) - features |= (1 << i); + features |= (1ULL << i); return features; } @@ -144,7 +144,7 @@ static void lg_finalize_features(struct virtio_device *vdev) memset(out_features, 0, desc->feature_len); bits = min_t(unsigned, desc->feature_len, sizeof(vdev->features)) * 8; for (i = 0; i < bits; i++) { - if (vdev->features & (1 << i)) + if (vdev->features & (1ULL << i)) out_features[i / 8] |= (1 << (i % 8)); } diff --git a/drivers/remoteproc/remoteproc_virtio.c b/drivers/remoteproc/remoteproc_virtio.c index dafaf38..627737e 100644 --- a/drivers/remoteproc/remoteproc_virtio.c +++ b/drivers/remoteproc/remoteproc_virtio.c @@ -207,7 +207,7 @@ static void rproc_virtio_reset(struct virtio_device *vdev) } /* provide the vdev features as retrieved from the firmware */ -static u32 rproc_virtio_get_features(struct virtio_device *vdev) +static u64 rproc_virtio_get_features(struct virtio_device *vdev) { struct rproc_vdev *rvdev = vdev_to_rvdev(vdev); struct fw_rsc_vdev *rsc; @@ -227,6 +227,9 @@ static void rproc_virtio_finalize_features(struct virtio_device *vdev) /* Give virtio_ring a chance to accept features */ vring_transport_features(vdev); + /* Make sure we don't have any features > 32 bits! */ + BUG_ON((u32)vdev->features != vdev->features); + /* * Remember the finalized features of our vdev, and provide it * to the remote processor once it is powered on. diff --git a/drivers/s390/kvm/kvm_virtio.c b/drivers/s390/kvm/kvm_virtio.c index ac79a09..c78251d 100644 --- a/drivers/s390/kvm/kvm_virtio.c +++ b/drivers/s390/kvm/kvm_virtio.c @@ -80,16 +80,16 @@ static unsigned desc_size(const struct kvm_device_desc *desc) } /* This gets the device's feature bits. */ -static u32 kvm_get_features(struct virtio_device *vdev) +static u64 kvm_get_features(struct virtio_device *vdev) { unsigned int i; - u32 features = 0; + u64 features = 0; struct kvm_device_desc *desc = to_kvmdev(vdev)->desc; u8 *in_features = kvm_vq_features(desc); - for (i = 0; i < min(desc->feature_len * 8, 32); i++) + for (i = 0; i < min(desc->feature_len * 8, 64); i++) if (in_features[i / 8] & (1 << (i % 8))) - features |= (1 << i); + features |= (1ULL << i); return features; } @@ -106,7 +106,7 @@ static void kvm_finalize_features(struct virtio_device *vdev) memset(out_features, 0, desc->feature_len); bits = min_t(unsigned, desc->feature_len, sizeof(vdev->features)) * 8; for (i = 0; i < bits; i++) { - if (vdev->features & (1 << i)) + if (vdev->features & (1ULL << i)) out_features[i / 8] |= (1 << (i % 8)); } } diff --git a/drivers/s390/kvm/virtio_ccw.c b/drivers/s390/kvm/virtio_ccw.c index 9ffd96f..27aab69 100644 --- a/drivers/s390/kvm/virtio_ccw.c +++ b/drivers/s390/kvm/virtio_ccw.c @@ -660,11 +660,12 @@ static void virtio_ccw_reset(struct virtio_device *vdev) kfree(ccw); } -static u32 virtio_ccw_get_features(struct virtio_device *vdev) +static u64 virtio_ccw_get_features(struct virtio_device *vdev) { struct virtio_ccw_device *vcdev = to_vc_device(vdev); struct virtio_feature_desc *features; - int ret, rc; + int ret; + u64 rc; struct ccw1 *ccw; ccw = kzalloc(sizeof(*ccw), GFP_DMA | GFP_KERNEL); @@ -677,7 +678,6 @@ static u32 virtio_ccw_get_features(struct virtio_device *vdev) goto out_free; } /* Read the feature bits from the host. */ - /* TODO: Features > 32 bits */ features->index = 0; ccw->cmd_code = CCW_CMD_READ_FEAT; ccw->flags = 0; @@ -691,6 +691,16 @@ static u32 virtio_ccw_get_features(struct virtio_device *vdev) rc = le32_to_cpu(features->features); + /* Read second half feature bits from the host. */ + features->index = 1; + ccw->cmd_code = CCW_CMD_READ_FEAT; + ccw->flags = 0; + ccw->count = sizeof(*features); + ccw->cda = (__u32)(unsigned long)features; + ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_READ_FEAT); + if (ret == 0) + rc |= (u64)le32_to_cpu(features->features) << 32; + out_free: kfree(features); kfree(ccw); @@ -715,8 +725,17 @@ static void virtio_ccw_finalize_features(struct virtio_device *vdev) vring_transport_features(vdev); features->index = 0; - features->features = cpu_to_le32(vdev->features); - /* Write the feature bits to the host. */ + features->features = cpu_to_le32((u32)vdev->features); + /* Write the first half of the feature bits to the host. */ + ccw->cmd_code = CCW_CMD_WRITE_FEAT; + ccw->flags = 0; + ccw->count = sizeof(*features); + ccw->cda = (__u32)(unsigned long)features; + ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_WRITE_FEAT); + + features->index = 1; + features->features = cpu_to_le32(vdev->features >> 32); + /* Write the second half of the feature bits to the host. */ ccw->cmd_code = CCW_CMD_WRITE_FEAT; ccw->flags = 0; ccw->count = sizeof(*features); diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c index 7814b1f..d213567 100644 --- a/drivers/virtio/virtio.c +++ b/drivers/virtio/virtio.c @@ -159,7 +159,7 @@ static int virtio_dev_probe(struct device *_d) int err, i; struct virtio_device *dev = dev_to_virtio(_d); struct virtio_driver *drv = drv_to_virtio(dev->dev.driver); - u32 device_features; + u64 device_features; /* We have a driver! */ add_status(dev, VIRTIO_CONFIG_S_DRIVER); @@ -171,15 +171,15 @@ static int virtio_dev_probe(struct device *_d) dev->features = 0; for (i = 0; i < drv->feature_table_size; i++) { unsigned int f = drv->feature_table[i]; - BUG_ON(f >= 32); - if (device_features & (1 << f)) - dev->features |= (1 << f); + BUG_ON(f >= 64); + if (device_features & (1ULL << f)) + dev->features |= (1ULL << f); } /* Transport features always preserved to pass to finalize_features. */ for (i = VIRTIO_TRANSPORT_F_START; i < VIRTIO_TRANSPORT_F_END; i++) - if (device_features & (1 << i)) - dev->features |= (1 << i); + if (device_features & (1ULL << i)) + dev->features |= (1ULL << i); dev->config->finalize_features(dev); diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c index eb5b0e2..fd01c6d 100644 --- a/drivers/virtio/virtio_mmio.c +++ b/drivers/virtio/virtio_mmio.c @@ -142,14 +142,16 @@ struct virtio_mmio_vq_info { /* Configuration interface */ -static u32 vm_get_features(struct virtio_device *vdev) +static u64 vm_get_features(struct virtio_device *vdev) { struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); + u64 features; - /* TODO: Features > 32 bits */ writel(0, vm_dev->base + VIRTIO_MMIO_HOST_FEATURES_SEL); - - return readl(vm_dev->base + VIRTIO_MMIO_HOST_FEATURES); + features = readl(vm_dev->base + VIRTIO_MMIO_HOST_FEATURES); + writel(1, vm_dev->base + VIRTIO_MMIO_HOST_FEATURES_SEL); + features |= ((u64)readl(vm_dev->base + VIRTIO_MMIO_HOST_FEATURES) << 32); + return features; } static void vm_finalize_features(struct virtio_device *vdev) @@ -160,7 +162,9 @@ static void vm_finalize_features(struct virtio_device *vdev) vring_transport_features(vdev); writel(0, vm_dev->base + VIRTIO_MMIO_GUEST_FEATURES_SEL); - writel(vdev->features, vm_dev->base + VIRTIO_MMIO_GUEST_FEATURES); + writel((u32)vdev->features, vm_dev->base + VIRTIO_MMIO_GUEST_FEATURES); + writel(1, vm_dev->base + VIRTIO_MMIO_GUEST_FEATURES_SEL); + writel(vdev->features >> 32, vm_dev->base + VIRTIO_MMIO_GUEST_FEATURES); } static void vm_get(struct virtio_device *vdev, unsigned offset, diff --git a/drivers/virtio/virtio_pci.c b/drivers/virtio/virtio_pci.c index ab95a4c..68c0711 100644 --- a/drivers/virtio/virtio_pci.c +++ b/drivers/virtio/virtio_pci.c @@ -102,12 +102,11 @@ static struct virtio_pci_device *to_vp_device(struct virtio_device *vdev) } /* virtio config->get_features() implementation */ -static u32 vp_get_features(struct virtio_device *vdev) +static u64 vp_get_features(struct virtio_device *vdev) { struct virtio_pci_device *vp_dev = to_vp_device(vdev); - /* When someone needs more than 32 feature bits, we'll need to - * steal a bit to indicate that the rest are somewhere else. */ + /* We only support 32 feature bits. */ return ioread32(vp_dev->ioaddr + VIRTIO_PCI_HOST_FEATURES); } diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index ea1c02e..b311fa7 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -782,7 +782,7 @@ void vring_transport_features(struct virtio_device *vdev) break; default: /* We don't understand this bit. */ - vdev->features &= ~(1 << i); + vdev->features &= ~(1ULL << i); } } } -- 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/