From 1a29ac014a68e5da8f96d5d8d142b5956eb00b7c Mon Sep 17 00:00:00 2001 From: Joerg Roedel Date: Thu, 10 Nov 2011 15:41:40 +0100 Subject: iommu/amd: Setup PPR log when supported by IOMMU Allocate and enable a log buffer for peripheral page faults when the IOMMU supports this feature. Signed-off-by: Joerg Roedel --- drivers/iommu/amd_iommu_init.c | 51 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) (limited to 'drivers/iommu/amd_iommu_init.c') diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c index fb4afd6d357d..60716cefa7af 100644 --- a/drivers/iommu/amd_iommu_init.c +++ b/drivers/iommu/amd_iommu_init.c @@ -583,6 +583,46 @@ static void __init free_event_buffer(struct amd_iommu *iommu) free_pages((unsigned long)iommu->evt_buf, get_order(EVT_BUFFER_SIZE)); } +/* allocates the memory where the IOMMU will log its events to */ +static u8 * __init alloc_ppr_log(struct amd_iommu *iommu) +{ + iommu->ppr_log = (u8 *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, + get_order(PPR_LOG_SIZE)); + + if (iommu->ppr_log == NULL) + return NULL; + + return iommu->ppr_log; +} + +static void iommu_enable_ppr_log(struct amd_iommu *iommu) +{ + u64 entry; + + if (iommu->ppr_log == NULL) + return; + + entry = (u64)virt_to_phys(iommu->ppr_log) | PPR_LOG_SIZE_512; + + memcpy_toio(iommu->mmio_base + MMIO_PPR_LOG_OFFSET, + &entry, sizeof(entry)); + + /* set head and tail to zero manually */ + writel(0x00, iommu->mmio_base + MMIO_PPR_HEAD_OFFSET); + writel(0x00, iommu->mmio_base + MMIO_PPR_TAIL_OFFSET); + + iommu_feature_enable(iommu, CONTROL_PPFLOG_EN); + iommu_feature_enable(iommu, CONTROL_PPR_EN); +} + +static void __init free_ppr_log(struct amd_iommu *iommu) +{ + if (iommu->ppr_log == NULL) + return; + + free_pages((unsigned long)iommu->ppr_log, get_order(PPR_LOG_SIZE)); +} + /* sets a specific bit in the device table entry. */ static void set_dev_entry_bit(u16 devid, u8 bit) { @@ -914,6 +954,7 @@ static void __init free_iommu_one(struct amd_iommu *iommu) { free_command_buffer(iommu); free_event_buffer(iommu); + free_ppr_log(iommu); iommu_unmap_mmio_space(iommu); } @@ -977,6 +1018,12 @@ static int __init init_iommu_one(struct amd_iommu *iommu, struct ivhd_header *h) init_iommu_from_acpi(iommu, h); init_iommu_devices(iommu); + if (iommu_feature(iommu, FEATURE_PPR)) { + iommu->ppr_log = alloc_ppr_log(iommu); + if (!iommu->ppr_log) + return -ENOMEM; + } + if (iommu->cap & (1UL << IOMMU_CAP_NPCACHE)) amd_iommu_np_cache = true; @@ -1063,6 +1110,9 @@ static int iommu_setup_msi(struct amd_iommu *iommu) iommu->int_enabled = true; iommu_feature_enable(iommu, CONTROL_EVT_INT_EN); + if (iommu->ppr_log != NULL) + iommu_feature_enable(iommu, CONTROL_PPFINT_EN); + return 0; } @@ -1287,6 +1337,7 @@ static void enable_iommus(void) iommu_set_device_table(iommu); iommu_enable_command_buffer(iommu); iommu_enable_event_buffer(iommu); + iommu_enable_ppr_log(iommu); iommu_set_exclusion_range(iommu); iommu_init_msi(iommu); iommu_enable(iommu); -- cgit v1.2.3