NVMe: Rework ioctls

Remove the special-purpose IDENTIFY, GET_RANGE_TYPE, DOWNLOAD_FIRMWARE
and ACTIVATE_FIRMWARE commands.  Replace them with a generic ADMIN_CMD
ioctl that can submit any admin command.

Add a new ID ioctl that returns the namespace ID of the queried device.
It corresponds to the SCSI Idlun ioctl.

Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>

1 files changed, 40 insertions, 88 deletions

diff --git a/drivers/block/nvme.c b/drivers/block/nvme.c
index f5e51a6116e3..9e3c724b95c3 100644
--- a/drivers/block/nvme.c
+++ b/drivers/block/nvme.c
@@ -1033,51 +1033,6 @@ static void nvme_unmap_user_pages(struct nvme_dev *dev, int write,
                 put_page(sg_page(&sg[i]));
 }
 
-static int nvme_submit_user_admin_command(struct nvme_dev *dev,
-                                        unsigned long addr, unsigned length,
-                                        struct nvme_command *cmd)
-{
-        int err, nents, tmplen = length;
-        struct scatterlist *sg;
-        struct nvme_prps *prps;
-
-        nents = nvme_map_user_pages(dev, 0, addr, length, &sg);
-        if (nents < 0)
-                return nents;
-        prps = nvme_setup_prps(dev, &cmd->common, sg, &tmplen, GFP_KERNEL);
-        if (tmplen != length)
-                err = -ENOMEM;
-        else
-                err = nvme_submit_admin_cmd(dev, cmd, NULL);
-        nvme_unmap_user_pages(dev, 0, addr, length, sg, nents);
-        nvme_free_prps(dev, prps);
-        return err ? -EIO : 0;
-}
-
-static int nvme_identify(struct nvme_ns *ns, unsigned long addr, int cns)
-{
-        struct nvme_command c;
-
-        memset(&c, 0, sizeof(c));
-        c.identify.opcode = nvme_admin_identify;
-        c.identify.nsid = cns ? 0 : cpu_to_le32(ns->ns_id);
-        c.identify.cns = cpu_to_le32(cns);
-
-        return nvme_submit_user_admin_command(ns->dev, addr, 4096, &c);
-}
-
-static int nvme_get_range_type(struct nvme_ns *ns, unsigned long addr)
-{
-        struct nvme_command c;
-
-        memset(&c, 0, sizeof(c));
-        c.features.opcode = nvme_admin_get_features;
-        c.features.nsid = cpu_to_le32(ns->ns_id);
-        c.features.fid = cpu_to_le32(NVME_FEAT_LBA_RANGE);
-
-        return nvme_submit_user_admin_command(ns->dev, addr, 4096, &c);
-}
-
 static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio)
 {
         struct nvme_dev *dev = ns->dev;
@@ -1096,10 +1051,11 @@ static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio)
         switch (io.opcode) {
         case nvme_cmd_write:
         case nvme_cmd_read:
+        case nvme_cmd_compare:
                 nents = nvme_map_user_pages(dev, io.opcode & 1, io.addr,
                                                                 length, &sg);
         default:
-                return -EFAULT;
+                return -EINVAL;
         }
 
         if (nents < 0)
@@ -1137,70 +1093,66 @@ static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio)
         return status;
 }
 
-static int nvme_download_firmware(struct nvme_ns *ns,
-                                                struct nvme_dlfw __user *udlfw)
+static int nvme_user_admin_cmd(struct nvme_ns *ns,
+                                        struct nvme_admin_cmd __user *ucmd)
 {
         struct nvme_dev *dev = ns->dev;
-        struct nvme_dlfw dlfw;
+        struct nvme_admin_cmd cmd;
         struct nvme_command c;
-        int nents, status, length;
+        int status, length, nents = 0;
         struct scatterlist *sg;
-        struct nvme_prps *prps;
+        struct nvme_prps *prps = NULL;
 
-        if (copy_from_user(&dlfw, udlfw, sizeof(dlfw)))
+        if (!capable(CAP_SYS_ADMIN))
+                return -EACCES;
+        if (copy_from_user(&cmd, ucmd, sizeof(cmd)))
                 return -EFAULT;
-        if (dlfw.length >= (1 << 30))
-                return -EINVAL;
-        length = dlfw.length * 4;
-
-        nents = nvme_map_user_pages(dev, 1, dlfw.addr, length, &sg);
-        if (nents < 0)
-                return nents;
 
         memset(&c, 0, sizeof(c));
-        c.dlfw.opcode = nvme_admin_download_fw;
-        c.dlfw.numd = cpu_to_le32(dlfw.length);
-        c.dlfw.offset = cpu_to_le32(dlfw.offset);
-        prps = nvme_setup_prps(dev, &c.common, sg, &length, GFP_KERNEL);
-        if (length != dlfw.length * 4)
+        c.common.opcode = cmd.opcode;
+        c.common.flags = cmd.flags;
+        c.common.nsid = cpu_to_le32(cmd.nsid);
+        c.common.cdw2[0] = cpu_to_le32(cmd.cdw2);
+        c.common.cdw2[1] = cpu_to_le32(cmd.cdw3);
+        c.common.cdw10[0] = cpu_to_le32(cmd.cdw10);
+        c.common.cdw10[1] = cpu_to_le32(cmd.cdw11);
+        c.common.cdw10[2] = cpu_to_le32(cmd.cdw12);
+        c.common.cdw10[3] = cpu_to_le32(cmd.cdw13);
+        c.common.cdw10[4] = cpu_to_le32(cmd.cdw14);
+        c.common.cdw10[5] = cpu_to_le32(cmd.cdw15);
+
+        length = cmd.data_len;
+        if (cmd.data_len) {
+                nents = nvme_map_user_pages(dev, 1, cmd.addr, length, &sg);
+                if (nents < 0)
+                        return nents;
+                prps = nvme_setup_prps(dev, &c.common, sg, &length, GFP_KERNEL);
+        }
+
+        if (length != cmd.data_len)
                 status = -ENOMEM;
         else
                 status = nvme_submit_admin_cmd(dev, &c, NULL);
-        nvme_unmap_user_pages(dev, 0, dlfw.addr, dlfw.length * 4, sg, nents);
-        nvme_free_prps(dev, prps);
+        if (cmd.data_len) {
+                nvme_unmap_user_pages(dev, 0, cmd.addr, cmd.data_len, sg,
+                                                                        nents);
+                nvme_free_prps(dev, prps);
+        }
         return status;
 }
 
-static int nvme_activate_firmware(struct nvme_ns *ns, unsigned long arg)
-{
-        struct nvme_dev *dev = ns->dev;
-        struct nvme_command c;
-
-        memset(&c, 0, sizeof(c));
-        c.common.opcode = nvme_admin_activate_fw;
-        c.common.rsvd10[0] = cpu_to_le32(arg);
-
-        return nvme_submit_admin_cmd(dev, &c, NULL);
-}
-
 static int nvme_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
                                                         unsigned long arg)
 {
         struct nvme_ns *ns = bdev->bd_disk->private_data;
 
         switch (cmd) {
-        case NVME_IOCTL_IDENTIFY_NS:
-                return nvme_identify(ns, arg, 0);
-        case NVME_IOCTL_IDENTIFY_CTRL:
-                return nvme_identify(ns, arg, 1);
-        case NVME_IOCTL_GET_RANGE_TYPE:
-                return nvme_get_range_type(ns, arg);
+        case NVME_IOCTL_ID:
+                return ns->ns_id;
+        case NVME_IOCTL_ADMIN_CMD:
+                return nvme_user_admin_cmd(ns, (void __user *)arg);
         case NVME_IOCTL_SUBMIT_IO:
                 return nvme_submit_io(ns, (void __user *)arg);
-        case NVME_IOCTL_DOWNLOAD_FW:
-                return nvme_download_firmware(ns, (void __user *)arg);
-        case NVME_IOCTL_ACTIVATE_FW:
-                return nvme_activate_firmware(ns, arg);
         default:
                 return -ENOTTY;
         }