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,
miklos@szeredi.hu
Cc: stefanha@redhat.com, dgilbert@redhat.com, mst@redhat.com,
Sebastien Boeuf <sebastien.boeuf@intel.com>
Subject: [PATCH 05/20] virtio: Implement get_shm_region for MMIO transport
Date: Wed, 4 Mar 2020 11:58:30 -0500 [thread overview]
Message-ID: <20200304165845.3081-6-vgoyal@redhat.com> (raw)
In-Reply-To: <20200304165845.3081-1-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>
---
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 97d5725fd9a2..4922a1a9e3a7 100644
--- a/drivers/virtio/virtio_mmio.c
+++ b/drivers/virtio/virtio_mmio.c
@@ -500,6 +500,37 @@ 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;
+ }
+
+ /* 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,
@@ -512,6 +543,7 @@ 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
--
2.20.1
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next prev parent reply other threads:[~2020-03-04 16:59 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-04 16:58 [PATCH 00/20] virtiofs: Add DAX support Vivek Goyal
2020-03-04 16:58 ` [PATCH 01/20] dax: Modify bdev_dax_pgoff() to handle NULL bdev Vivek Goyal
2020-03-04 16:58 ` [PATCH 02/20] dax: Create a range version of dax_layout_busy_page() Vivek Goyal
2020-03-10 15:19 ` Ira Weiny
2020-03-10 20:29 ` Vivek Goyal
2020-03-04 16:58 ` [PATCH 03/20] virtio: Add get_shm_region method Vivek Goyal
2020-03-10 10:53 ` Stefan Hajnoczi
2020-03-04 16:58 ` [PATCH 04/20] virtio: Implement get_shm_region for PCI transport Vivek Goyal
2020-03-10 11:04 ` Stefan Hajnoczi
2020-03-10 18:19 ` Vivek Goyal
2020-03-11 17:34 ` Stefan Hajnoczi
2020-03-11 19:29 ` Vivek Goyal
2020-03-10 11:12 ` Michael S. Tsirkin
2020-03-10 18:47 ` Vivek Goyal
2020-03-10 21:27 ` Michael S. Tsirkin
2020-03-04 16:58 ` Vivek Goyal [this message]
2020-03-10 11:06 ` [PATCH 05/20] virtio: Implement get_shm_region for MMIO transport Stefan Hajnoczi
2020-03-04 16:58 ` [PATCH 06/20] virtiofs: Provide a helper function for virtqueue initialization Vivek Goyal
2020-03-10 14:10 ` Miklos Szeredi
2020-03-04 16:58 ` [PATCH 07/20] fuse: Get rid of no_mount_options Vivek Goyal
2020-03-10 14:12 ` Miklos Szeredi
2020-03-04 16:58 ` [PATCH 08/20] fuse,virtiofs: Add a mount option to enable dax Vivek Goyal
2020-03-10 14:16 ` Miklos Szeredi
2020-03-04 16:58 ` [PATCH 09/20] virtio_fs, dax: Set up virtio_fs dax_device Vivek Goyal
2020-03-04 16:58 ` [PATCH 10/20] fuse,virtiofs: Keep a list of free dax memory ranges Vivek Goyal
2020-03-10 19:29 ` Miklos Szeredi
2020-03-04 16:58 ` [PATCH 11/20] fuse: implement FUSE_INIT map_alignment field Vivek Goyal
2020-03-10 19:31 ` Miklos Szeredi
2020-03-04 16:58 ` [PATCH 12/20] fuse: Introduce setupmapping/removemapping commands Vivek Goyal
2020-03-10 19:49 ` Miklos Szeredi
2020-03-10 20:33 ` Vivek Goyal
2020-03-11 7:03 ` Amir Goldstein
2020-03-11 14:19 ` Miklos Szeredi
2020-03-11 14:41 ` Vivek Goyal
2020-03-11 15:12 ` Miklos Szeredi
2020-03-04 16:58 ` [PATCH 13/20] fuse, dax: Implement dax read/write operations Vivek Goyal
2020-03-12 9:43 ` Miklos Szeredi
2020-03-12 16:02 ` Vivek Goyal
2020-03-13 10:18 ` Miklos Szeredi
2020-03-13 13:41 ` Vivek Goyal
2020-04-04 0:25 ` Liu Bo
2020-04-14 12:54 ` Vivek Goyal
2020-03-04 16:58 ` [PATCH 14/20] fuse,dax: add DAX mmap support Vivek Goyal
2020-03-04 16:58 ` [PATCH 15/20] fuse, dax: Take ->i_mmap_sem lock during dax page fault Vivek Goyal
2020-03-04 16:58 ` [PATCH 16/20] fuse,virtiofs: Define dax address space operations Vivek Goyal
2020-03-04 16:58 ` [PATCH 17/20] fuse,virtiofs: Maintain a list of busy elements Vivek Goyal
2020-03-04 16:58 ` [PATCH 18/20] fuse: Release file in process context Vivek Goyal
2020-03-04 16:58 ` [PATCH 19/20] fuse: Take inode lock for dax inode truncation Vivek Goyal
2020-03-04 16:58 ` [PATCH 20/20] fuse,virtiofs: Add logic to free up a memory range Vivek Goyal
2020-03-11 5:16 ` Liu Bo
2020-03-11 12:59 ` Vivek Goyal
2020-03-11 17:24 ` Liu Bo
2020-03-26 0:09 ` Liu Bo
2020-03-27 14:01 ` Vivek Goyal
2020-03-27 22:06 ` Liu Bo
2020-04-14 19:30 ` Vivek Goyal
2020-04-15 17:22 ` Liu Bo
2020-04-16 19:05 ` Vivek Goyal
2020-04-17 18:05 ` Liu Bo
2020-03-11 5:22 ` [PATCH 00/20] virtiofs: Add DAX support Amir Goldstein
2020-03-11 13:09 ` Vivek Goyal
2020-03-11 18:48 ` Vivek Goyal
2020-03-11 19:32 ` Amir Goldstein
2020-03-11 19:39 ` Vivek Goyal
2020-03-11 13:38 ` Patrick Ohly
2020-03-16 13:02 ` Vivek Goyal
2020-03-17 8:28 ` Patrick Ohly
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