From: Vivek Goyal <vgoyal@redhat.com>
To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-nvdimm@lists.01.org, virtio-fs@redhat.com
Cc: miklos@szeredi.hu, stefanha@redhat.com, dgilbert@redhat.com,
Sebastien Boeuf <sebastien.boeuf@intel.com>,
kvm@vger.kernel.org, virtualization@lists.linux-foundation.org,
"Michael S. Tsirkin" <mst@redhat.com>
Subject: [PATCH v3 05/18] virtio: Implement get_shm_region for MMIO transport
Date: Wed, 19 Aug 2020 18:19:43 -0400 [thread overview]
Message-ID: <20200819221956.845195-6-vgoyal@redhat.com> (raw)
In-Reply-To: <20200819221956.845195-1-vgoyal@redhat.com>
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: virtualization@lists.linux-foundation.org
Cc: "Michael S. Tsirkin" <mst@redhat.com>
---
drivers/virtio/virtio_mmio.c | 31 +++++++++++++++++++++++++++++++
include/uapi/linux/virtio_mmio.h | 11 +++++++++++
2 files changed, 42 insertions(+)
diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c
index 627ac0487494..238383ff1064 100644
--- a/drivers/virtio/virtio_mmio.c
+++ b/drivers/virtio/virtio_mmio.c
@@ -498,6 +498,36 @@ 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;
+
+ /* 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 +540,7 @@ 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
_______________________________________________
Linux-nvdimm mailing list -- linux-nvdimm@lists.01.org
To unsubscribe send an email to linux-nvdimm-leave@lists.01.org
next prev parent reply other threads:[~2020-08-19 22:21 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-19 22:19 [PATCH v3 00/18] virtiofs: Add DAX support Vivek Goyal
2020-08-19 22:19 ` [PATCH v3 01/18] dax: Modify bdev_dax_pgoff() to handle NULL bdev Vivek Goyal
2020-08-19 22:19 ` [PATCH v3 02/18] dax: Create a range version of dax_layout_busy_page() Vivek Goyal
2020-08-20 12:58 ` Jan Kara
2020-08-20 14:29 ` Vivek Goyal
2020-08-19 22:19 ` [PATCH v3 03/18] virtio: Add get_shm_region method Vivek Goyal
2020-08-19 22:19 ` [PATCH v3 04/18] virtio: Implement get_shm_region for PCI transport Vivek Goyal
2020-08-19 22:19 ` Vivek Goyal [this message]
2020-08-19 22:19 ` [PATCH v3 06/18] virtiofs: Provide a helper function for virtqueue initialization Vivek Goyal
2020-08-19 22:19 ` [PATCH v3 07/18] fuse: Get rid of no_mount_options Vivek Goyal
2020-08-19 22:19 ` [PATCH v3 08/18] virtio_fs, dax: Set up virtio_fs dax_device Vivek Goyal
2020-08-19 22:19 ` [PATCH v3 09/18] fuse,virtiofs: Add a mount option to enable dax Vivek Goyal
2020-08-19 22:19 ` [PATCH v3 10/18] fuse,virtiofs: Keep a list of free dax memory ranges Vivek Goyal
2020-08-19 22:19 ` [PATCH v3 11/18] fuse: implement FUSE_INIT map_alignment field Vivek Goyal
2020-08-26 14:06 ` Miklos Szeredi
2020-08-26 15:51 ` Vivek Goyal
2020-08-26 17:34 ` Stefan Hajnoczi
2020-08-26 19:17 ` Dr. David Alan Gilbert
2020-08-26 19:26 ` Miklos Szeredi
2020-08-26 19:53 ` Vivek Goyal
2020-08-19 22:19 ` [PATCH v3 12/18] fuse: Introduce setupmapping/removemapping commands Vivek Goyal
2020-08-19 22:19 ` [PATCH v3 13/18] fuse, dax: Implement dax read/write operations Vivek Goyal
2020-08-19 22:19 ` [PATCH v3 14/18] fuse,dax: add DAX mmap support Vivek Goyal
2020-08-19 22:19 ` [PATCH v3 15/18] fuse,virtiofs: Define dax address space operations Vivek Goyal
2020-08-19 22:19 ` [PATCH v3 16/18] fuse, dax: Serialize truncate/punch_hole and dax fault path Vivek Goyal
2020-08-19 22:19 ` [PATCH v3 17/18] fuse,virtiofs: Maintain a list of busy elements Vivek Goyal
2020-08-19 22:19 ` [PATCH v3 18/18] fuse,virtiofs: Add logic to free up a memory range Vivek Goyal
2020-08-28 14:26 ` [PATCH v3 00/18] virtiofs: Add DAX support Miklos Szeredi
2020-08-28 14:39 ` Vivek Goyal
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200819221956.845195-6-vgoyal@redhat.com \
--to=vgoyal@redhat.com \
--cc=dgilbert@redhat.com \
--cc=kvm@vger.kernel.org \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-nvdimm@lists.01.org \
--cc=miklos@szeredi.hu \
--cc=mst@redhat.com \
--cc=sebastien.boeuf@intel.com \
--cc=stefanha@redhat.com \
--cc=virtio-fs@redhat.com \
--cc=virtualization@lists.linux-foundation.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).