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[16/52] virtio-fs: Add VIRTIO_PCI_CAP_SHARED_MEMORY_CFG and utility to find them

Message ID 20181210171318.16998-17-vgoyal@redhat.com (mailing list archive)
State New, archived
Headers show
Series virtio-fs: shared file system for virtual machines | expand

Commit Message

Vivek Goyal Dec. 10, 2018, 5:12 p.m. UTC 
From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>

The shm cap defines a capability to allow 64bit size chunks at 64 bit
size offsets into a bar.  There can be multiple such chunks on any one
device.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
---
 fs/fuse/virtio_fs.c             | 69 +++++++++++++++++++++++++++++++++++++++++
 include/uapi/linux/virtio_pci.h | 10 ++++++
 2 files changed, 79 insertions(+)

Comments

kernel test robot Dec. 12, 2018, 4:36 p.m. UTC | #1 
Hi David,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on fuse/for-next]
[also build test WARNING on v4.20-rc6]
[cannot apply to next-20181212]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Vivek-Goyal/virtio-fs-shared-file-system-for-virtual-machines/20181211-103034
base:   https://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse.git for-next


coccinelle warnings: (new ones prefixed by >>)

>> fs/fuse/virtio_fs.c:88:17-18: Unneeded semicolon

Please review and possibly fold the followup patch.

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation
diff mbox series

Patch

diff --git a/fs/fuse/virtio_fs.c b/fs/fuse/virtio_fs.c
index 87b7e42a6763..cd916943205e 100644
--- a/fs/fuse/virtio_fs.c
+++ b/fs/fuse/virtio_fs.c
@@ -11,6 +11,7 @@ 
 #include <linux/module.h>
 #include <linux/virtio.h>
 #include <linux/virtio_fs.h>
+#include <uapi/linux/virtio_pci.h>
 #include "fuse_i.h"
 
 enum {
@@ -57,6 +58,74 @@  struct virtio_fs {
 	size_t window_len;
 };
 
+/* TODO: This should be in a PCI file somewhere */
+static int virtio_pci_find_shm_cap(struct pci_dev *dev,
+                                   u8 required_id,
+                                   u8 *bar, u64 *offset, u64 *len)
+{
+	int pos;
+
+        for (pos = pci_find_capability(dev, PCI_CAP_ID_VNDR);
+             pos > 0;
+             pos = pci_find_next_capability(dev, pos, PCI_CAP_ID_VNDR)) {
+		u8 type, cap_len, id;
+                u32 tmp32;
+                u64 res_offset, res_length;
+
+		pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap,
+                                                         cfg_type),
+                                     &type);
+                if (type != VIRTIO_PCI_CAP_SHARED_MEMORY_CFG)
+                        continue;
+
+		pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap,
+                                                         cap_len),
+                                     &cap_len);
+                if (cap_len != sizeof(struct virtio_pci_shm_cap)) {
+		        printk(KERN_ERR "%s: shm cap with bad size offset: %d size: %d\n",
+                               __func__, pos, cap_len);
+                        continue;
+                };
+
+		pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_shm_cap,
+                                                         id),
+                                     &id);
+                if (id != required_id)
+                        continue;
+
+                /* Type, and ID match, looks good */
+                pci_read_config_byte(dev, pos + offsetof(struct virtio_pci_cap,
+                                                         bar),
+                                     bar);
+
+                /* Read the lower 32bit of length and offset */
+                pci_read_config_dword(dev, pos + offsetof(struct virtio_pci_cap, offset),
+                                      &tmp32);
+                res_offset = tmp32;
+                pci_read_config_dword(dev, pos + offsetof(struct virtio_pci_cap, length),
+                                      &tmp32);
+                res_length = tmp32;
+
+                /* and now the top half */
+                pci_read_config_dword(dev,
+                                      pos + offsetof(struct virtio_pci_shm_cap,
+                                                     offset_hi),
+                                      &tmp32);
+                res_offset |= ((u64)tmp32) << 32;
+                pci_read_config_dword(dev,
+                                      pos + offsetof(struct virtio_pci_shm_cap,
+                                                     length_hi),
+                                      &tmp32);
+                res_length |= ((u64)tmp32) << 32;
+
+                *offset = res_offset;
+                *len = res_length;
+
+                return pos;
+        }
+        return 0;
+}
+
 static inline struct virtio_fs_vq *vq_to_fsvq(struct virtqueue *vq)
 {
 	struct virtio_fs *fs = vq->vdev->priv;
diff --git a/include/uapi/linux/virtio_pci.h b/include/uapi/linux/virtio_pci.h
index 90007a1abcab..2e6072b5a7c9 100644
--- a/include/uapi/linux/virtio_pci.h
+++ b/include/uapi/linux/virtio_pci.h
@@ -113,6 +113,8 @@ 
 #define VIRTIO_PCI_CAP_DEVICE_CFG	4
 /* PCI configuration access */
 #define VIRTIO_PCI_CAP_PCI_CFG		5
+/* Additional shared memory capability */
+#define VIRTIO_PCI_CAP_SHARED_MEMORY_CFG 8
 
 /* This is the PCI capability header: */
 struct virtio_pci_cap {
@@ -163,6 +165,14 @@  struct virtio_pci_cfg_cap {
 	__u8 pci_cfg_data[4]; /* Data for BAR access. */
 };
 
+/* Fields in VIRTIO_PCI_CAP_SHARED_MEMORY_CFG */
+struct virtio_pci_shm_cap {
+	struct virtio_pci_cap cap;
+	__le32 offset_hi;             /* Most sig 32 bits of offset */
+	__le32 length_hi;             /* Most sig 32 bits of length */
+        __u8   id;                    /* To distinguish shm chunks */
+};
+
 /* Macro versions of offsets for the Old Timers! */
 #define VIRTIO_PCI_CAP_VNDR		0
 #define VIRTIO_PCI_CAP_NEXT		1