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x86, AMD IOMMU: add command buffer (de-)allocation

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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>
This commit is contained in:
Joerg Roedel 2008-06-26 21:27:45 +02:00 committed by Ingo Molnar
parent b2026aa2dc
commit b36ca91e1d
1 changed files with 30 additions and 0 deletions
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30
arch/x86/kernel/amd_iommu_init.c
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@ -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));
}