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-rw-r--r--drivers/iommu/amd_iommu_init.c123
1 files changed, 30 insertions, 93 deletions
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 5ef347a13cb5..a7cc3996d3b6 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -408,20 +408,6 @@ static inline int ivhd_entry_length(u8 *ivhd)
}
/*
- * This function reads the last device id the IOMMU has to handle from the PCI
- * capability header for this IOMMU
- */
-static int __init find_last_devid_on_pci(int bus, int dev, int fn, int cap_ptr)
-{
- u32 cap;
-
- cap = read_pci_config(bus, dev, fn, cap_ptr+MMIO_RANGE_OFFSET);
- update_last_devid(PCI_DEVID(MMIO_GET_BUS(cap), MMIO_GET_LD(cap)));
-
- return 0;
-}
-
-/*
* After reading the highest device id from the IOMMU PCI capability header
* this function looks if there is a higher device id defined in the ACPI table
*/
@@ -433,14 +419,13 @@ static int __init find_last_devid_from_ivhd(struct ivhd_header *h)
p += sizeof(*h);
end += h->length;
- find_last_devid_on_pci(PCI_BUS_NUM(h->devid),
- PCI_SLOT(h->devid),
- PCI_FUNC(h->devid),
- h->cap_ptr);
-
while (p < end) {
dev = (struct ivhd_entry *)p;
switch (dev->type) {
+ case IVHD_DEV_ALL:
+ /* Use maximum BDF value for DEV_ALL */
+ update_last_devid(0xffff);
+ break;
case IVHD_DEV_SELECT:
case IVHD_DEV_RANGE_END:
case IVHD_DEV_ALIAS:
@@ -513,17 +498,12 @@ 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));
-
- if (cmd_buf == NULL)
- return NULL;
+ iommu->cmd_buf = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
+ get_order(CMD_BUFFER_SIZE));
- iommu->cmd_buf_size = CMD_BUFFER_SIZE | CMD_BUFFER_UNINITIALIZED;
-
- return cmd_buf;
+ return iommu->cmd_buf ? 0 : -ENOMEM;
}
/*
@@ -557,27 +537,20 @@ static void iommu_enable_command_buffer(struct amd_iommu *iommu)
&entry, sizeof(entry));
amd_iommu_reset_cmd_buffer(iommu);
- iommu->cmd_buf_size &= ~(CMD_BUFFER_UNINITIALIZED);
}
static void __init free_command_buffer(struct amd_iommu *iommu)
{
- free_pages((unsigned long)iommu->cmd_buf,
- get_order(iommu->cmd_buf_size & ~(CMD_BUFFER_UNINITIALIZED)));
+ free_pages((unsigned long)iommu->cmd_buf, get_order(CMD_BUFFER_SIZE));
}
/* 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;
-
- iommu->evt_buf_size = EVT_BUFFER_SIZE;
-
- return iommu->evt_buf;
+ return iommu->evt_buf ? 0 : -ENOMEM;
}
static void iommu_enable_event_buffer(struct amd_iommu *iommu)
@@ -604,15 +577,12 @@ 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)
@@ -835,20 +805,10 @@ static int __init init_iommu_from_acpi(struct amd_iommu *iommu,
switch (e->type) {
case IVHD_DEV_ALL:
- DUMP_printk(" DEV_ALL\t\t\t first devid: %02x:%02x.%x"
- " last device %02x:%02x.%x flags: %02x\n",
- PCI_BUS_NUM(iommu->first_device),
- PCI_SLOT(iommu->first_device),
- PCI_FUNC(iommu->first_device),
- PCI_BUS_NUM(iommu->last_device),
- PCI_SLOT(iommu->last_device),
- PCI_FUNC(iommu->last_device),
- e->flags);
+ DUMP_printk(" DEV_ALL\t\t\tflags: %02x\n", e->flags);
- for (dev_i = iommu->first_device;
- dev_i <= iommu->last_device; ++dev_i)
- set_dev_entry_from_acpi(iommu, dev_i,
- e->flags, 0);
+ for (dev_i = 0; dev_i <= amd_iommu_last_bdf; ++dev_i)
+ set_dev_entry_from_acpi(iommu, dev_i, e->flags, 0);
break;
case IVHD_DEV_SELECT:
@@ -1004,17 +964,6 @@ static int __init init_iommu_from_acpi(struct amd_iommu *iommu,
return 0;
}
-/* Initializes the device->iommu mapping for the driver */
-static int __init init_iommu_devices(struct amd_iommu *iommu)
-{
- u32 i;
-
- for (i = iommu->first_device; i <= iommu->last_device; ++i)
- set_iommu_for_device(iommu, i);
-
- return 0;
-}
-
static void __init free_iommu_one(struct amd_iommu *iommu)
{
free_command_buffer(iommu);
@@ -1111,12 +1060,10 @@ 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;
@@ -1135,8 +1082,6 @@ static int __init init_iommu_one(struct amd_iommu *iommu, struct ivhd_header *h)
*/
amd_iommu_rlookup_table[iommu->devid] = NULL;
- init_iommu_devices(iommu);
-
return 0;
}
@@ -1256,6 +1201,9 @@ static int iommu_init_pci(struct amd_iommu *iommu)
if (!iommu->dev)
return -ENODEV;
+ /* Prevent binding other PCI device drivers to IOMMU devices */
+ iommu->dev->match_driver = false;
+
pci_read_config_dword(iommu->dev, cap_ptr + MMIO_CAP_HDR_OFFSET,
&iommu->cap);
pci_read_config_dword(iommu->dev, cap_ptr + MMIO_RANGE_OFFSET,
@@ -1263,11 +1211,6 @@ static int iommu_init_pci(struct amd_iommu *iommu)
pci_read_config_dword(iommu->dev, cap_ptr + MMIO_MISC_OFFSET,
&misc);
- iommu->first_device = PCI_DEVID(MMIO_GET_BUS(range),
- MMIO_GET_FD(range));
- iommu->last_device = PCI_DEVID(MMIO_GET_BUS(range),
- MMIO_GET_LD(range));
-
if (!(iommu->cap & (1 << IOMMU_CAP_IOTLB)))
amd_iommu_iotlb_sup = false;
@@ -1305,11 +1248,8 @@ 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;
@@ -1755,11 +1695,8 @@ static void __init free_on_init_error(void)
free_pages((unsigned long)irq_lookup_table,
get_order(rlookup_table_size));
- if (amd_iommu_irq_cache) {
- kmem_cache_destroy(amd_iommu_irq_cache);
- amd_iommu_irq_cache = NULL;
-
- }
+ kmem_cache_destroy(amd_iommu_irq_cache);
+ amd_iommu_irq_cache = NULL;
free_pages((unsigned long)amd_iommu_rlookup_table,
get_order(rlookup_table_size));
@@ -2198,7 +2135,7 @@ int __init amd_iommu_detect(void)
iommu_detected = 1;
x86_init.iommu.iommu_init = amd_iommu_init;
- return 0;
+ return 1;
}
/****************************************************************************
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.