From: Joerg Roedel <jroedel@suse.de>
Date: Tue, 20 Oct 2015 15:33:41 +0000 (+0200)
Subject: iommu/amd: Remove cmd_buf_size and evt_buf_size from struct amd_iommu
X-Git-Tag: firefly_0821_release~176^2~781^2^7~4
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=deba4bce168a87ef90211ba69850d3428b453765;p=firefly-linux-kernel-4.4.55.git

iommu/amd: Remove cmd_buf_size and evt_buf_size from struct amd_iommu

The driver always uses a constant size for these buffers
anyway, so there is no need to waste memory to store the
sizes.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
---

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index fe112bbaae88..02b8ad761600 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -534,7 +534,7 @@ static void iommu_poll_events(struct amd_iommu *iommu)
 
 	while (head != tail) {
 		iommu_print_event(iommu, iommu->evt_buf + head);
-		head = (head + EVENT_ENTRY_SIZE) % iommu->evt_buf_size;
+		head = (head + EVENT_ENTRY_SIZE) % EVT_BUFFER_SIZE;
 	}
 
 	writel(head, iommu->mmio_base + MMIO_EVT_HEAD_OFFSET);
@@ -684,7 +684,7 @@ static void copy_cmd_to_buffer(struct amd_iommu *iommu,
 	u8 *target;
 
 	target = iommu->cmd_buf + tail;
-	tail   = (tail + sizeof(*cmd)) % iommu->cmd_buf_size;
+	tail   = (tail + sizeof(*cmd)) % CMD_BUFFER_SIZE;
 
 	/* Copy command to buffer */
 	memcpy(target, cmd, sizeof(*cmd));
@@ -851,15 +851,13 @@ static int iommu_queue_command_sync(struct amd_iommu *iommu,
 	u32 left, tail, head, next_tail;
 	unsigned long flags;
 
-	WARN_ON(iommu->cmd_buf_size & CMD_BUFFER_UNINITIALIZED);
-
 again:
 	spin_lock_irqsave(&iommu->lock, flags);
 
 	head      = readl(iommu->mmio_base + MMIO_CMD_HEAD_OFFSET);
 	tail      = readl(iommu->mmio_base + MMIO_CMD_TAIL_OFFSET);
-	next_tail = (tail + sizeof(*cmd)) % iommu->cmd_buf_size;
-	left      = (head - next_tail) % iommu->cmd_buf_size;
+	next_tail = (tail + sizeof(*cmd)) % CMD_BUFFER_SIZE;
+	left      = (head - next_tail) % CMD_BUFFER_SIZE;
 
 	if (left <= 2) {
 		struct iommu_cmd sync_cmd;
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 3ba1ee709824..3a977a751dad 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -521,8 +521,6 @@ static u8 * __init alloc_command_buffer(struct amd_iommu *iommu)
 	if (cmd_buf == NULL)
 		return NULL;
 
-	iommu->cmd_buf_size = CMD_BUFFER_SIZE | CMD_BUFFER_UNINITIALIZED;
-
 	return cmd_buf;
 }
 
@@ -557,13 +555,11 @@ static void iommu_enable_command_buffer(struct amd_iommu *iommu)
 		    &entry, sizeof(entry));
 
 	amd_iommu_reset_cmd_buffer(iommu);
-	iommu->cmd_buf_size &= ~(CMD_BUFFER_UNINITIALIZED);
 }
 
 static void __init free_command_buffer(struct amd_iommu *iommu)
 {
-	free_pages((unsigned long)iommu->cmd_buf,
-		   get_order(iommu->cmd_buf_size & ~(CMD_BUFFER_UNINITIALIZED)));
+	free_pages((unsigned long)iommu->cmd_buf, get_order(CMD_BUFFER_SIZE));
 }
 
 /* allocates the memory where the IOMMU will log its events to */
@@ -575,8 +571,6 @@ static u8 * __init alloc_event_buffer(struct amd_iommu *iommu)
 	if (iommu->evt_buf == NULL)
 		return NULL;
 
-	iommu->evt_buf_size = EVT_BUFFER_SIZE;
-
 	return iommu->evt_buf;
 }
 
diff --git a/drivers/iommu/amd_iommu_types.h b/drivers/iommu/amd_iommu_types.h
index 3026b3448b98..921b2e95161b 100644
--- a/drivers/iommu/amd_iommu_types.h
+++ b/drivers/iommu/amd_iommu_types.h
@@ -528,11 +528,7 @@ struct amd_iommu {
 
 	/* command buffer virtual address */
 	u8 *cmd_buf;
-	/* size of command buffer */
-	u32 cmd_buf_size;
 
-	/* size of event buffer */
-	u32 evt_buf_size;
 	/* event buffer virtual address */
 	u8 *evt_buf;