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authorJoerg Roedel <jroedel@suse.de>2015-10-20 17:33:42 +0200
committerJoerg Roedel <jroedel@suse.de>2015-10-21 11:30:33 +0200
commitf2c2db53b99eb6c48e259a722eef724d6b53b156 (patch)
tree942821e6fde6d1458a20dfa95bae5ccca08332e0 /drivers/iommu
parentdeba4bce168a87ef90211ba69850d3428b453765 (diff)
downloadlinux-f2c2db53b99eb6c48e259a722eef724d6b53b156.tar.bz2
iommu/amd: Cleanup buffer allocation
Clean up the functions to allocate the command, event and ppr-log buffers. Remove redundant code and change the return value to int. Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/amd_iommu_init.c46
1 files changed, 16 insertions, 30 deletions
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 3a977a751dad..9c6efcb6527e 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -513,15 +513,12 @@ static int __init find_last_devid_acpi(struct acpi_table_header *table)
* write commands to that buffer later and the IOMMU will execute them
* asynchronously
*/
-static u8 * __init alloc_command_buffer(struct amd_iommu *iommu)
+static int __init alloc_command_buffer(struct amd_iommu *iommu)
{
- u8 *cmd_buf = (u8 *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
- get_order(CMD_BUFFER_SIZE));
+ iommu->cmd_buf = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
+ get_order(CMD_BUFFER_SIZE));
- if (cmd_buf == NULL)
- return NULL;
-
- return cmd_buf;
+ return iommu->cmd_buf ? 0 : -ENOMEM;
}
/*
@@ -563,15 +560,12 @@ static void __init free_command_buffer(struct amd_iommu *iommu)
}
/* allocates the memory where the IOMMU will log its events to */
-static u8 * __init alloc_event_buffer(struct amd_iommu *iommu)
+static int __init alloc_event_buffer(struct amd_iommu *iommu)
{
- iommu->evt_buf = (u8 *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
- get_order(EVT_BUFFER_SIZE));
+ iommu->evt_buf = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
+ get_order(EVT_BUFFER_SIZE));
- if (iommu->evt_buf == NULL)
- return NULL;
-
- return iommu->evt_buf;
+ return iommu->evt_buf ? 0 : -ENOMEM;
}
static void iommu_enable_event_buffer(struct amd_iommu *iommu)
@@ -598,15 +592,12 @@ static void __init free_event_buffer(struct amd_iommu *iommu)
}
/* allocates the memory where the IOMMU will log its events to */
-static u8 * __init alloc_ppr_log(struct amd_iommu *iommu)
+static int __init alloc_ppr_log(struct amd_iommu *iommu)
{
- iommu->ppr_log = (u8 *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
- get_order(PPR_LOG_SIZE));
+ iommu->ppr_log = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
+ get_order(PPR_LOG_SIZE));
- if (iommu->ppr_log == NULL)
- return NULL;
-
- return iommu->ppr_log;
+ return iommu->ppr_log ? 0 : -ENOMEM;
}
static void iommu_enable_ppr_log(struct amd_iommu *iommu)
@@ -1105,12 +1096,10 @@ static int __init init_iommu_one(struct amd_iommu *iommu, struct ivhd_header *h)
if (!iommu->mmio_base)
return -ENOMEM;
- iommu->cmd_buf = alloc_command_buffer(iommu);
- if (!iommu->cmd_buf)
+ if (alloc_command_buffer(iommu))
return -ENOMEM;
- iommu->evt_buf = alloc_event_buffer(iommu);
- if (!iommu->evt_buf)
+ if (alloc_event_buffer(iommu))
return -ENOMEM;
iommu->int_enabled = false;
@@ -1299,11 +1288,8 @@ static int iommu_init_pci(struct amd_iommu *iommu)
amd_iommu_v2_present = true;
}
- if (iommu_feature(iommu, FEATURE_PPR)) {
- iommu->ppr_log = alloc_ppr_log(iommu);
- if (!iommu->ppr_log)
- return -ENOMEM;
- }
+ if (iommu_feature(iommu, FEATURE_PPR) && alloc_ppr_log(iommu))
+ return -ENOMEM;
if (iommu->cap & (1UL << IOMMU_CAP_NPCACHE))
amd_iommu_np_cache = true;