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iommu/amd: Remove cmd_buf_size and evt_buf_size from struct amd_iommu

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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>
This commit is contained in:
Joerg Roedel
2015-10-20 17:33:41 +02:00
parent ca9cab3a5a
commit deba4bce16
3 changed files with 5 additions and 17 deletions
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10
drivers/iommu/amd_iommu.c
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@@ -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;