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authorJoerg Roedel <joerg.roedel@amd.com>2008-06-26 21:27:45 +0200
committerIngo Molnar <mingo@elte.hu>2008-06-27 10:12:10 +0200
commitb36ca91e1d2d7e846844820784d57d20ad73dbd8 (patch)
tree9452099ea66cf8b54d604f07e5037c43f6b188e5
parentb2026aa2dce4454950ccd9c410790f310d65696a (diff)
x86, AMD IOMMU: add command buffer (de-)allocation
This patch adds the functions to allocate and deallocate the command buffer for one IOMMU in the system. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Cc: iommu@lists.linux-foundation.org Cc: bhavna.sarathy@amd.com Cc: Sebastian.Biemueller@amd.com Cc: robert.richter@amd.com Cc: joro@8bytes.org Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r--arch/x86/kernel/amd_iommu_init.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c
index ffb8ac82e32..c2be3adee87 100644
--- a/arch/x86/kernel/amd_iommu_init.c
+++ b/arch/x86/kernel/amd_iommu_init.c
@@ -278,3 +278,33 @@ static int __init find_last_devid_acpi(struct acpi_table_header *table)
return 0;
}
+static u8 * __init alloc_command_buffer(struct amd_iommu *iommu)
+{
+ u8 *cmd_buf = (u8 *)__get_free_pages(GFP_KERNEL,
+ get_order(CMD_BUFFER_SIZE));
+ u64 entry = 0;
+
+ if (cmd_buf == NULL)
+ return NULL;
+
+ iommu->cmd_buf_size = CMD_BUFFER_SIZE;
+
+ memset(cmd_buf, 0, CMD_BUFFER_SIZE);
+
+ entry = (u64)virt_to_phys(cmd_buf);
+ entry |= MMIO_CMD_SIZE_512;
+ memcpy_toio(iommu->mmio_base + MMIO_CMD_BUF_OFFSET,
+ &entry, sizeof(entry));
+
+ iommu_feature_enable(iommu, CONTROL_CMDBUF_EN);
+
+ return cmd_buf;
+}
+
+static void __init free_command_buffer(struct amd_iommu *iommu)
+{
+ if (iommu->cmd_buf)
+ free_pages((unsigned long)iommu->cmd_buf,
+ get_order(CMD_BUFFER_SIZE));
+}
+