| From | Joerg Roedel <> | Subject | [PATCH 09/34] AMD IOMMU: add command buffer (de-)allocation | Date | Thu, 26 Jun 2008 21:27:45 +0200 |
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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> --- arch/x86/kernel/amd_iommu_init.c | 30 ++++++++++++++++++++++++++++++ 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 ffb8ac8..c2be3ad 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)); +} + -- 1.5.3.7
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