releases/5.3.9/revert-nvme-allow-64-bit-results-in-passthru-command.patch

From c44cad6384ce51d4a3dd2ee68b7b8f2d26302e4c Mon Sep 17 00:00:00 2001
From: Sasha Levin <sashal@kernel.org>
Date: Tue, 5 Nov 2019 21:09:19 -0500
Subject: Revert "nvme: allow 64-bit results in passthru commands"

This reverts commit 76d609da9ed1cc0dc780e2b539d7b827ce28f182.

The patch adds new functionality and shouldn't have been backported.

Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/nvme/host/core.c        | 108 +++++---------------------------
 include/uapi/linux/nvme_ioctl.h |  23 -------
 2 files changed, 16 insertions(+), 115 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 36a5ed1eacbea..3304e2c8a448a 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -852,7 +852,7 @@ out:
 static int nvme_submit_user_cmd(struct request_queue *q,
 		struct nvme_command *cmd, void __user *ubuffer,
 		unsigned bufflen, void __user *meta_buffer, unsigned meta_len,
-		u32 meta_seed, u64 *result, unsigned timeout)
+		u32 meta_seed, u32 *result, unsigned timeout)
 {
 	bool write = nvme_is_write(cmd);
 	struct nvme_ns *ns = q->queuedata;
@@ -893,7 +893,7 @@ static int nvme_submit_user_cmd(struct request_queue *q,
 	else
 		ret = nvme_req(req)->status;
 	if (result)
-		*result = le64_to_cpu(nvme_req(req)->result.u64);
+		*result = le32_to_cpu(nvme_req(req)->result.u32);
 	if (meta && !ret && !write) {
 		if (copy_to_user(meta_buffer, meta, meta_len))
 			ret = -EFAULT;
@@ -1339,54 +1339,6 @@ static int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
 	struct nvme_command c;
 	unsigned timeout = 0;
 	u32 effects;
-	u64 result;
-	int status;
-
-	if (!capable(CAP_SYS_ADMIN))
-		return -EACCES;
-	if (copy_from_user(&cmd, ucmd, sizeof(cmd)))
-		return -EFAULT;
-	if (cmd.flags)
-		return -EINVAL;
-
-	memset(&c, 0, sizeof(c));
-	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 = cpu_to_le32(cmd.cdw10);
-	c.common.cdw11 = cpu_to_le32(cmd.cdw11);
-	c.common.cdw12 = cpu_to_le32(cmd.cdw12);
-	c.common.cdw13 = cpu_to_le32(cmd.cdw13);
-	c.common.cdw14 = cpu_to_le32(cmd.cdw14);
-	c.common.cdw15 = cpu_to_le32(cmd.cdw15);
-
-	if (cmd.timeout_ms)
-		timeout = msecs_to_jiffies(cmd.timeout_ms);
-
-	effects = nvme_passthru_start(ctrl, ns, cmd.opcode);
-	status = nvme_submit_user_cmd(ns ? ns->queue : ctrl->admin_q, &c,
-			(void __user *)(uintptr_t)cmd.addr, cmd.data_len,
-			(void __user *)(uintptr_t)cmd.metadata,
-			cmd.metadata_len, 0, &result, timeout);
-	nvme_passthru_end(ctrl, effects);
-
-	if (status >= 0) {
-		if (put_user(result, &ucmd->result))
-			return -EFAULT;
-	}
-
-	return status;
-}
-
-static int nvme_user_cmd64(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
-			struct nvme_passthru_cmd64 __user *ucmd)
-{
-	struct nvme_passthru_cmd64 cmd;
-	struct nvme_command c;
-	unsigned timeout = 0;
-	u32 effects;
 	int status;
 
 	if (!capable(CAP_SYS_ADMIN))
@@ -1457,41 +1409,6 @@ static void nvme_put_ns_from_disk(struct nvme_ns_head *head, int idx)
 		srcu_read_unlock(&head->srcu, idx);
 }
 
-static bool is_ctrl_ioctl(unsigned int cmd)
-{
-	if (cmd == NVME_IOCTL_ADMIN_CMD || cmd == NVME_IOCTL_ADMIN64_CMD)
-		return true;
-	if (is_sed_ioctl(cmd))
-		return true;
-	return false;
-}
-
-static int nvme_handle_ctrl_ioctl(struct nvme_ns *ns, unsigned int cmd,
-				  void __user *argp,
-				  struct nvme_ns_head *head,
-				  int srcu_idx)
-{
-	struct nvme_ctrl *ctrl = ns->ctrl;
-	int ret;
-
-	nvme_get_ctrl(ns->ctrl);
-	nvme_put_ns_from_disk(head, srcu_idx);
-
-	switch (cmd) {
-	case NVME_IOCTL_ADMIN_CMD:
-		ret = nvme_user_cmd(ctrl, NULL, argp);
-		break;
-	case NVME_IOCTL_ADMIN64_CMD:
-		ret = nvme_user_cmd64(ctrl, NULL, argp);
-		break;
-	default:
-		ret = sed_ioctl(ctrl->opal_dev, cmd, argp);
-		break;
-	}
-	nvme_put_ctrl(ctrl);
-	return ret;
-}
-
 static int nvme_ioctl(struct block_device *bdev, fmode_t mode,
 		unsigned int cmd, unsigned long arg)
 {
@@ -1509,8 +1426,20 @@ static int nvme_ioctl(struct block_device *bdev, fmode_t mode,
 	 * seperately and drop the ns SRCU reference early.  This avoids a
 	 * deadlock when deleting namespaces using the passthrough interface.
 	 */
-	if (is_ctrl_ioctl(cmd))
-		return nvme_handle_ctrl_ioctl(ns, cmd, argp, head, srcu_idx);
+	if (cmd == NVME_IOCTL_ADMIN_CMD || is_sed_ioctl(cmd)) {
+		struct nvme_ctrl *ctrl = ns->ctrl;
+
+		nvme_get_ctrl(ns->ctrl);
+		nvme_put_ns_from_disk(head, srcu_idx);
+
+		if (cmd == NVME_IOCTL_ADMIN_CMD)
+			ret = nvme_user_cmd(ctrl, NULL, argp);
+		else
+			ret = sed_ioctl(ctrl->opal_dev, cmd, argp);
+
+		nvme_put_ctrl(ctrl);
+		return ret;
+	}
 
 	switch (cmd) {
 	case NVME_IOCTL_ID:
@@ -1523,9 +1452,6 @@ static int nvme_ioctl(struct block_device *bdev, fmode_t mode,
 	case NVME_IOCTL_SUBMIT_IO:
 		ret = nvme_submit_io(ns, argp);
 		break;
-	case NVME_IOCTL_IO64_CMD:
-		ret = nvme_user_cmd64(ns->ctrl, ns, argp);
-		break;
 	default:
 		if (ns->ndev)
 			ret = nvme_nvm_ioctl(ns, cmd, arg);
@@ -2900,8 +2826,6 @@ static long nvme_dev_ioctl(struct file *file, unsigned int cmd,
 	switch (cmd) {
 	case NVME_IOCTL_ADMIN_CMD:
 		return nvme_user_cmd(ctrl, NULL, argp);
-	case NVME_IOCTL_ADMIN64_CMD:
-		return nvme_user_cmd64(ctrl, NULL, argp);
 	case NVME_IOCTL_IO_CMD:
 		return nvme_dev_user_cmd(ctrl, argp);
 	case NVME_IOCTL_RESET:
diff --git a/include/uapi/linux/nvme_ioctl.h b/include/uapi/linux/nvme_ioctl.h
index e168dc59e9a0d..1c215ea1798e6 100644
--- a/include/uapi/linux/nvme_ioctl.h
+++ b/include/uapi/linux/nvme_ioctl.h
@@ -45,27 +45,6 @@ struct nvme_passthru_cmd {
 	__u32	result;
 };
 
-struct nvme_passthru_cmd64 {
-	__u8	opcode;
-	__u8	flags;
-	__u16	rsvd1;
-	__u32	nsid;
-	__u32	cdw2;
-	__u32	cdw3;
-	__u64	metadata;
-	__u64	addr;
-	__u32	metadata_len;
-	__u32	data_len;
-	__u32	cdw10;
-	__u32	cdw11;
-	__u32	cdw12;
-	__u32	cdw13;
-	__u32	cdw14;
-	__u32	cdw15;
-	__u32	timeout_ms;
-	__u64	result;
-};
-
 #define nvme_admin_cmd nvme_passthru_cmd
 
 #define NVME_IOCTL_ID		_IO('N', 0x40)
@@ -75,7 +54,5 @@ struct nvme_passthru_cmd64 {
 #define NVME_IOCTL_RESET	_IO('N', 0x44)
 #define NVME_IOCTL_SUBSYS_RESET	_IO('N', 0x45)
 #define NVME_IOCTL_RESCAN	_IO('N', 0x46)
-#define NVME_IOCTL_ADMIN64_CMD	_IOWR('N', 0x47, struct nvme_passthru_cmd64)
-#define NVME_IOCTL_IO64_CMD	_IOWR('N', 0x48, struct nvme_passthru_cmd64)
 
 #endif /* _UAPI_LINUX_NVME_IOCTL_H */
-- 
2.20.1