From: "Michael S. Tsirkin" <mst@redhat.com> To: Vivek Goyal <vgoyal@redhat.com> Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, virtio-fs@redhat.com, miklos@szeredi.hu, stefanha@redhat.com, dgilbert@redhat.com, Sebastien Boeuf <sebastien.boeuf@intel.com>, kvm@vger.kernel.org Subject: Re: [PATCH v2 05/20] virtio: Implement get_shm_region for MMIO transport Date: Mon, 10 Aug 2020 10:03:17 -0400 [thread overview] Message-ID: <20200810100240-mutt-send-email-mst@kernel.org> (raw) In-Reply-To: <20200807195526.426056-6-vgoyal@redhat.com> On Fri, Aug 07, 2020 at 03:55:11PM -0400, Vivek Goyal wrote: > From: Sebastien Boeuf <sebastien.boeuf@intel.com> > > On MMIO a new set of registers is defined for finding SHM > regions. Add their definitions and use them to find the region. > > Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com> > Cc: kvm@vger.kernel.org > Cc: "Michael S. Tsirkin" <mst@redhat.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> > --- > drivers/virtio/virtio_mmio.c | 32 ++++++++++++++++++++++++++++++++ > include/uapi/linux/virtio_mmio.h | 11 +++++++++++ > 2 files changed, 43 insertions(+) > > diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c > index 627ac0487494..2697c492cf78 100644 > --- a/drivers/virtio/virtio_mmio.c > +++ b/drivers/virtio/virtio_mmio.c > @@ -498,6 +498,37 @@ static const char *vm_bus_name(struct virtio_device *vdev) > return vm_dev->pdev->name; > } > > +static bool vm_get_shm_region(struct virtio_device *vdev, > + struct virtio_shm_region *region, u8 id) > +{ > + struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); > + u64 len, addr; > + > + /* Select the region we're interested in */ > + writel(id, vm_dev->base + VIRTIO_MMIO_SHM_SEL); > + > + /* Read the region size */ > + len = (u64) readl(vm_dev->base + VIRTIO_MMIO_SHM_LEN_LOW); > + len |= (u64) readl(vm_dev->base + VIRTIO_MMIO_SHM_LEN_HIGH) << 32; > + > + region->len = len; > + > + /* Check if region length is -1. If that's the case, the shared memory > + * region does not exist and there is no need to proceed further. > + */ > + if (len == ~(u64)0) { > + return false; > + } > + It might make sense to validate that addr/len do not overlap. Will be useful for PCI too. Can be a patch on top. > + /* Read the region base address */ > + addr = (u64) readl(vm_dev->base + VIRTIO_MMIO_SHM_BASE_LOW); > + addr |= (u64) readl(vm_dev->base + VIRTIO_MMIO_SHM_BASE_HIGH) << 32; > + > + region->addr = addr; > + > + return true; > +} > + > static const struct virtio_config_ops virtio_mmio_config_ops = { > .get = vm_get, > .set = vm_set, > @@ -510,6 +541,7 @@ static const struct virtio_config_ops virtio_mmio_config_ops = { > .get_features = vm_get_features, > .finalize_features = vm_finalize_features, > .bus_name = vm_bus_name, > + .get_shm_region = vm_get_shm_region, > }; > > > diff --git a/include/uapi/linux/virtio_mmio.h b/include/uapi/linux/virtio_mmio.h > index c4b09689ab64..0650f91bea6c 100644 > --- a/include/uapi/linux/virtio_mmio.h > +++ b/include/uapi/linux/virtio_mmio.h > @@ -122,6 +122,17 @@ > #define VIRTIO_MMIO_QUEUE_USED_LOW 0x0a0 > #define VIRTIO_MMIO_QUEUE_USED_HIGH 0x0a4 > > +/* Shared memory region id */ > +#define VIRTIO_MMIO_SHM_SEL 0x0ac > + > +/* Shared memory region length, 64 bits in two halves */ > +#define VIRTIO_MMIO_SHM_LEN_LOW 0x0b0 > +#define VIRTIO_MMIO_SHM_LEN_HIGH 0x0b4 > + > +/* Shared memory region base address, 64 bits in two halves */ > +#define VIRTIO_MMIO_SHM_BASE_LOW 0x0b8 > +#define VIRTIO_MMIO_SHM_BASE_HIGH 0x0bc > + > /* Configuration atomicity value */ > #define VIRTIO_MMIO_CONFIG_GENERATION 0x0fc > > -- > 2.25.4 >
WARNING: multiple messages have this Message-ID (diff)
From: "Michael S. Tsirkin" <mst@redhat.com> To: Vivek Goyal <vgoyal@redhat.com> Cc: kvm@vger.kernel.org, miklos@szeredi.hu, linux-kernel@vger.kernel.org, virtio-fs@redhat.com, linux-fsdevel@vger.kernel.org Subject: Re: [Virtio-fs] [PATCH v2 05/20] virtio: Implement get_shm_region for MMIO transport Date: Mon, 10 Aug 2020 10:03:17 -0400 [thread overview] Message-ID: <20200810100240-mutt-send-email-mst@kernel.org> (raw) In-Reply-To: <20200807195526.426056-6-vgoyal@redhat.com> On Fri, Aug 07, 2020 at 03:55:11PM -0400, Vivek Goyal wrote: > From: Sebastien Boeuf <sebastien.boeuf@intel.com> > > On MMIO a new set of registers is defined for finding SHM > regions. Add their definitions and use them to find the region. > > Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com> > Cc: kvm@vger.kernel.org > Cc: "Michael S. Tsirkin" <mst@redhat.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> > --- > drivers/virtio/virtio_mmio.c | 32 ++++++++++++++++++++++++++++++++ > include/uapi/linux/virtio_mmio.h | 11 +++++++++++ > 2 files changed, 43 insertions(+) > > diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c > index 627ac0487494..2697c492cf78 100644 > --- a/drivers/virtio/virtio_mmio.c > +++ b/drivers/virtio/virtio_mmio.c > @@ -498,6 +498,37 @@ static const char *vm_bus_name(struct virtio_device *vdev) > return vm_dev->pdev->name; > } > > +static bool vm_get_shm_region(struct virtio_device *vdev, > + struct virtio_shm_region *region, u8 id) > +{ > + struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev); > + u64 len, addr; > + > + /* Select the region we're interested in */ > + writel(id, vm_dev->base + VIRTIO_MMIO_SHM_SEL); > + > + /* Read the region size */ > + len = (u64) readl(vm_dev->base + VIRTIO_MMIO_SHM_LEN_LOW); > + len |= (u64) readl(vm_dev->base + VIRTIO_MMIO_SHM_LEN_HIGH) << 32; > + > + region->len = len; > + > + /* Check if region length is -1. If that's the case, the shared memory > + * region does not exist and there is no need to proceed further. > + */ > + if (len == ~(u64)0) { > + return false; > + } > + It might make sense to validate that addr/len do not overlap. Will be useful for PCI too. Can be a patch on top. > + /* Read the region base address */ > + addr = (u64) readl(vm_dev->base + VIRTIO_MMIO_SHM_BASE_LOW); > + addr |= (u64) readl(vm_dev->base + VIRTIO_MMIO_SHM_BASE_HIGH) << 32; > + > + region->addr = addr; > + > + return true; > +} > + > static const struct virtio_config_ops virtio_mmio_config_ops = { > .get = vm_get, > .set = vm_set, > @@ -510,6 +541,7 @@ static const struct virtio_config_ops virtio_mmio_config_ops = { > .get_features = vm_get_features, > .finalize_features = vm_finalize_features, > .bus_name = vm_bus_name, > + .get_shm_region = vm_get_shm_region, > }; > > > diff --git a/include/uapi/linux/virtio_mmio.h b/include/uapi/linux/virtio_mmio.h > index c4b09689ab64..0650f91bea6c 100644 > --- a/include/uapi/linux/virtio_mmio.h > +++ b/include/uapi/linux/virtio_mmio.h > @@ -122,6 +122,17 @@ > #define VIRTIO_MMIO_QUEUE_USED_LOW 0x0a0 > #define VIRTIO_MMIO_QUEUE_USED_HIGH 0x0a4 > > +/* Shared memory region id */ > +#define VIRTIO_MMIO_SHM_SEL 0x0ac > + > +/* Shared memory region length, 64 bits in two halves */ > +#define VIRTIO_MMIO_SHM_LEN_LOW 0x0b0 > +#define VIRTIO_MMIO_SHM_LEN_HIGH 0x0b4 > + > +/* Shared memory region base address, 64 bits in two halves */ > +#define VIRTIO_MMIO_SHM_BASE_LOW 0x0b8 > +#define VIRTIO_MMIO_SHM_BASE_HIGH 0x0bc > + > /* Configuration atomicity value */ > #define VIRTIO_MMIO_CONFIG_GENERATION 0x0fc > > -- > 2.25.4 >
next prev parent reply other threads:[~2020-08-10 14:03 UTC|newest] Thread overview: 97+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-08-07 19:55 [PATCH v2 00/20] virtiofs: Add DAX support Vivek Goyal 2020-08-07 19:55 ` [Virtio-fs] " Vivek Goyal 2020-08-07 19:55 ` [PATCH v2 01/20] dax: Modify bdev_dax_pgoff() to handle NULL bdev Vivek Goyal 2020-08-07 19:55 ` [Virtio-fs] " Vivek Goyal 2020-08-07 19:55 ` Vivek Goyal 2020-08-17 16:57 ` Jan Kara 2020-08-17 16:57 ` [Virtio-fs] " Jan Kara 2020-08-17 16:57 ` Jan Kara 2020-08-07 19:55 ` [PATCH v2 02/20] dax: Create a range version of dax_layout_busy_page() Vivek Goyal 2020-08-07 19:55 ` [Virtio-fs] " Vivek Goyal 2020-08-07 19:55 ` Vivek Goyal 2020-08-17 16:53 ` Jan Kara 2020-08-17 16:53 ` [Virtio-fs] " Jan Kara 2020-08-17 16:53 ` Jan Kara 2020-08-17 17:22 ` Vivek Goyal 2020-08-17 17:22 ` [Virtio-fs] " Vivek Goyal 2020-08-17 17:22 ` Vivek Goyal 2020-08-07 19:55 ` [PATCH v2 03/20] virtio: Add get_shm_region method Vivek Goyal 2020-08-07 19:55 ` [Virtio-fs] " Vivek Goyal 2020-08-10 13:47 ` Michael S. Tsirkin 2020-08-10 13:47 ` [Virtio-fs] " Michael S. Tsirkin 2020-08-10 13:54 ` Vivek Goyal 2020-08-10 13:54 ` [Virtio-fs] " Vivek Goyal 2020-08-10 14:02 ` Michael S. Tsirkin 2020-08-10 14:02 ` [Virtio-fs] " Michael S. Tsirkin 2020-08-10 14:06 ` Michael S. Tsirkin 2020-08-10 14:06 ` [Virtio-fs] " Michael S. Tsirkin 2020-08-07 19:55 ` [PATCH v2 04/20] virtio: Implement get_shm_region for PCI transport Vivek Goyal 2020-08-07 19:55 ` [Virtio-fs] " Vivek Goyal 2020-08-10 14:05 ` Michael S. Tsirkin 2020-08-10 14:05 ` [Virtio-fs] " Michael S. Tsirkin 2020-08-10 14:50 ` Vivek Goyal 2020-08-10 14:50 ` [Virtio-fs] " Vivek Goyal 2020-08-14 2:51 ` Gurchetan Singh 2020-08-17 20:29 ` Vivek Goyal 2020-08-17 20:29 ` [Virtio-fs] " Vivek Goyal 2020-08-07 19:55 ` [PATCH v2 05/20] virtio: Implement get_shm_region for MMIO transport Vivek Goyal 2020-08-07 19:55 ` [Virtio-fs] " Vivek Goyal 2020-08-10 14:03 ` Michael S. Tsirkin [this message] 2020-08-10 14:03 ` Michael S. Tsirkin 2020-08-07 19:55 ` [PATCH v2 06/20] virtiofs: Provide a helper function for virtqueue initialization Vivek Goyal 2020-08-07 19:55 ` [Virtio-fs] " Vivek Goyal 2020-08-07 19:55 ` [PATCH v2 07/20] fuse: Get rid of no_mount_options Vivek Goyal 2020-08-07 19:55 ` [Virtio-fs] " Vivek Goyal 2020-08-07 19:55 ` [PATCH v2 08/20] fuse,virtiofs: Add a mount option to enable dax Vivek Goyal 2020-08-07 19:55 ` [Virtio-fs] [PATCH v2 08/20] fuse, virtiofs: " Vivek Goyal 2020-08-07 19:55 ` [PATCH v2 09/20] virtio_fs, dax: Set up virtio_fs dax_device Vivek Goyal 2020-08-07 19:55 ` [Virtio-fs] " Vivek Goyal 2020-08-07 19:55 ` [PATCH v2 10/20] fuse,virtiofs: Keep a list of free dax memory ranges Vivek Goyal 2020-08-07 19:55 ` [Virtio-fs] [PATCH v2 10/20] fuse, virtiofs: " Vivek Goyal 2020-08-07 19:55 ` [PATCH v2 11/20] fuse: implement FUSE_INIT map_alignment field Vivek Goyal 2020-08-07 19:55 ` [Virtio-fs] " Vivek Goyal 2020-08-07 19:55 ` [PATCH v2 12/20] fuse: Introduce setupmapping/removemapping commands Vivek Goyal 2020-08-07 19:55 ` [Virtio-fs] " Vivek Goyal 2020-08-07 19:55 ` [PATCH v2 13/20] fuse, dax: Implement dax read/write operations Vivek Goyal 2020-08-07 19:55 ` [Virtio-fs] " Vivek Goyal 2020-08-10 22:06 ` Dave Chinner 2020-08-10 22:06 ` [Virtio-fs] " Dave Chinner 2020-08-11 17:44 ` Vivek Goyal 2020-08-11 17:44 ` [Virtio-fs] " Vivek Goyal 2020-08-07 19:55 ` [PATCH v2 14/20] fuse,dax: add DAX mmap support Vivek Goyal 2020-08-07 19:55 ` [Virtio-fs] " Vivek Goyal 2020-08-07 19:55 ` [PATCH v2 15/20] fuse, dax: Take ->i_mmap_sem lock during dax page fault Vivek Goyal 2020-08-07 19:55 ` [Virtio-fs] " Vivek Goyal 2020-08-10 22:22 ` Dave Chinner 2020-08-10 22:22 ` [Virtio-fs] " Dave Chinner 2020-08-11 17:55 ` Vivek Goyal 2020-08-11 17:55 ` [Virtio-fs] " Vivek Goyal 2020-08-12 1:23 ` Dave Chinner 2020-08-12 1:23 ` [Virtio-fs] " Dave Chinner 2020-08-12 21:10 ` Vivek Goyal 2020-08-12 21:10 ` [Virtio-fs] " Vivek Goyal 2020-08-13 5:12 ` Dave Chinner 2020-08-13 5:12 ` [Virtio-fs] " Dave Chinner 2020-08-07 19:55 ` [PATCH v2 16/20] fuse,virtiofs: Define dax address space operations Vivek Goyal 2020-08-07 19:55 ` [Virtio-fs] [PATCH v2 16/20] fuse, virtiofs: " Vivek Goyal 2020-08-07 19:55 ` [PATCH v2 17/20] fuse,virtiofs: Maintain a list of busy elements Vivek Goyal 2020-08-07 19:55 ` [Virtio-fs] [PATCH v2 17/20] fuse, virtiofs: " Vivek Goyal 2020-08-07 19:55 ` [PATCH v2 18/20] fuse: Release file in process context Vivek Goyal 2020-08-07 19:55 ` [Virtio-fs] " Vivek Goyal 2020-08-10 8:29 ` Miklos Szeredi 2020-08-10 8:29 ` [Virtio-fs] " Miklos Szeredi 2020-08-10 15:48 ` Vivek Goyal 2020-08-10 15:48 ` [Virtio-fs] " Vivek Goyal 2020-08-10 19:37 ` Vivek Goyal 2020-08-10 19:37 ` [Virtio-fs] " Vivek Goyal 2020-08-10 19:39 ` Miklos Szeredi 2020-08-10 19:39 ` [Virtio-fs] " Miklos Szeredi 2020-08-07 19:55 ` [PATCH v2 19/20] fuse: Take inode lock for dax inode truncation Vivek Goyal 2020-08-07 19:55 ` [Virtio-fs] " Vivek Goyal 2020-08-07 19:55 ` [PATCH v2 20/20] fuse,virtiofs: Add logic to free up a memory range Vivek Goyal 2020-08-07 19:55 ` [Virtio-fs] [PATCH v2 20/20] fuse, virtiofs: " Vivek Goyal 2020-08-10 7:29 ` [PATCH v2 00/20] virtiofs: Add DAX support Miklos Szeredi 2020-08-10 7:29 ` [Virtio-fs] " Miklos Szeredi 2020-08-10 13:08 ` Vivek Goyal 2020-08-10 13:08 ` [Virtio-fs] " Vivek Goyal 2020-08-10 13:08 ` Vivek Goyal
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