From a2f14820e3493145c25095873d4a510a1b25efdc Mon Sep 17 00:00:00 2001 From: Felix Kuehling Date: Sat, 26 Aug 2017 02:43:06 -0400 Subject: [PATCH] drm/amdgpu: Track pending retry faults in IH and VM (v2) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit IH tracks pending retry faults in a hash table for fast lookup in interrupt context. Each VM has a short FIFO of pending VM faults for processing in a bottom half. The IH prescreening stage adds retry faults and filters out repeated retry interrupts to minimize the impact of interrupt storms. It's the VM's responsibility remove pending faults once they are handled. For now this is only done when the VM is destroyed. v2: - Made the hash table smaller and the FIFO longer. I never want the FIFO to fill up, because that would make prescreen take longer. 128 pending page faults should be enough to keep migrations busy. Signed-off-by: Felix Kuehling Acked-by: Christian König (v1) Reviewed-by: Alex Deucher Signed-off-by: Alex Deucher --- drivers/gpu/drm/Kconfig | 1 + drivers/gpu/drm/amd/amdgpu/amdgpu_ih.c | 76 +++++++++++++++++++++++++ drivers/gpu/drm/amd/amdgpu/amdgpu_ih.h | 12 ++++ drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 7 +++ drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h | 7 +++ drivers/gpu/drm/amd/amdgpu/vega10_ih.c | 78 +++++++++++++++++++++++++- 6 files changed, 180 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig index 1989c276138c..7fb8492d8e63 100644 --- a/drivers/gpu/drm/Kconfig +++ b/drivers/gpu/drm/Kconfig @@ -184,6 +184,7 @@ config DRM_AMDGPU select BACKLIGHT_CLASS_DEVICE select BACKLIGHT_LCD_SUPPORT select INTERVAL_TREE + select CHASH help Choose this option if you have a recent AMD Radeon graphics card. diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ih.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ih.c index c834a40cfad6..f5f27e4f0f7f 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ih.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ih.c @@ -196,3 +196,79 @@ int amdgpu_ih_process(struct amdgpu_device *adev) return IRQ_HANDLED; } + +/** + * amdgpu_ih_add_fault - Add a page fault record + * + * @adev: amdgpu device pointer + * @key: 64-bit encoding of PASID and address + * + * This should be called when a retry page fault interrupt is + * received. If this is a new page fault, it will be added to a hash + * table. The return value indicates whether this is a new fault, or + * a fault that was already known and is already being handled. + * + * If there are too many pending page faults, this will fail. Retry + * interrupts should be ignored in this case until there is enough + * free space. + * + * Returns 0 if the fault was added, 1 if the fault was already known, + * -ENOSPC if there are too many pending faults. + */ +int amdgpu_ih_add_fault(struct amdgpu_device *adev, u64 key) +{ + unsigned long flags; + int r = -ENOSPC; + + if (WARN_ON_ONCE(!adev->irq.ih.faults)) + /* Should be allocated in _ih_sw_init on GPUs that + * support retry faults and require retry filtering. + */ + return r; + + spin_lock_irqsave(&adev->irq.ih.faults->lock, flags); + + /* Only let the hash table fill up to 50% for best performance */ + if (adev->irq.ih.faults->count >= (1 << (AMDGPU_PAGEFAULT_HASH_BITS-1))) + goto unlock_out; + + r = chash_table_copy_in(&adev->irq.ih.faults->hash, key, NULL); + if (!r) + adev->irq.ih.faults->count++; + + /* chash_table_copy_in should never fail unless we're losing count */ + WARN_ON_ONCE(r < 0); + +unlock_out: + spin_unlock_irqrestore(&adev->irq.ih.faults->lock, flags); + return r; +} + +/** + * amdgpu_ih_clear_fault - Remove a page fault record + * + * @adev: amdgpu device pointer + * @key: 64-bit encoding of PASID and address + * + * This should be called when a page fault has been handled. Any + * future interrupt with this key will be processed as a new + * page fault. + */ +void amdgpu_ih_clear_fault(struct amdgpu_device *adev, u64 key) +{ + unsigned long flags; + int r; + + if (!adev->irq.ih.faults) + return; + + spin_lock_irqsave(&adev->irq.ih.faults->lock, flags); + + r = chash_table_remove(&adev->irq.ih.faults->hash, key, NULL); + if (!WARN_ON_ONCE(r < 0)) { + adev->irq.ih.faults->count--; + WARN_ON_ONCE(adev->irq.ih.faults->count < 0); + } + + spin_unlock_irqrestore(&adev->irq.ih.faults->lock, flags); +} diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ih.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ih.h index 3de8e74e5b3a..ada89358e220 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ih.h +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ih.h @@ -24,6 +24,8 @@ #ifndef __AMDGPU_IH_H__ #define __AMDGPU_IH_H__ +#include + struct amdgpu_device; /* * vega10+ IH clients @@ -69,6 +71,13 @@ enum amdgpu_ih_clientid #define AMDGPU_IH_CLIENTID_LEGACY 0 +#define AMDGPU_PAGEFAULT_HASH_BITS 8 +struct amdgpu_retryfault_hashtable { + DECLARE_CHASH_TABLE(hash, AMDGPU_PAGEFAULT_HASH_BITS, 8, 0); + spinlock_t lock; + int count; +}; + /* * R6xx+ IH ring */ @@ -87,6 +96,7 @@ struct amdgpu_ih_ring { bool use_doorbell; bool use_bus_addr; dma_addr_t rb_dma_addr; /* only used when use_bus_addr = true */ + struct amdgpu_retryfault_hashtable *faults; }; #define AMDGPU_IH_SRC_DATA_MAX_SIZE_DW 4 @@ -109,5 +119,7 @@ int amdgpu_ih_ring_init(struct amdgpu_device *adev, unsigned ring_size, bool use_bus_addr); void amdgpu_ih_ring_fini(struct amdgpu_device *adev); int amdgpu_ih_process(struct amdgpu_device *adev); +int amdgpu_ih_add_fault(struct amdgpu_device *adev, u64 key); +void amdgpu_ih_clear_fault(struct amdgpu_device *adev, u64 key); #endif diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c index 9b795915cab1..6c1133298b17 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c @@ -2680,6 +2680,8 @@ int amdgpu_vm_init(struct amdgpu_device *adev, struct amdgpu_vm *vm, vm->pasid = pasid; } + INIT_KFIFO(vm->faults); + return 0; error_free_root: @@ -2731,8 +2733,13 @@ void amdgpu_vm_fini(struct amdgpu_device *adev, struct amdgpu_vm *vm) { struct amdgpu_bo_va_mapping *mapping, *tmp; bool prt_fini_needed = !!adev->gart.gart_funcs->set_prt; + u64 fault; int i; + /* Clear pending page faults from IH when the VM is destroyed */ + while (kfifo_get(&vm->faults, &fault)) + amdgpu_ih_clear_fault(adev, fault); + if (vm->pasid) { unsigned long flags; diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h index 7873dfa8c0f9..447ed6e7e586 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h @@ -120,6 +120,10 @@ struct amdgpu_vm_pt { unsigned last_entry_used; }; +#define AMDGPU_VM_FAULT(pasid, addr) (((u64)(pasid) << 48) | (addr)) +#define AMDGPU_VM_FAULT_PASID(fault) ((u64)(fault) >> 48) +#define AMDGPU_VM_FAULT_ADDR(fault) ((u64)(fault) & 0xfffffffff000ULL) + struct amdgpu_vm { /* tree of virtual addresses mapped */ struct rb_root va; @@ -160,6 +164,9 @@ struct amdgpu_vm { /* Flag to indicate ATS support from PTE for GFX9 */ bool pte_support_ats; + + /* Up to 128 pending page faults */ + DECLARE_KFIFO(faults, u64, 128); }; struct amdgpu_vm_id { diff --git a/drivers/gpu/drm/amd/amdgpu/vega10_ih.c b/drivers/gpu/drm/amd/amdgpu/vega10_ih.c index eda4771e273f..dd6af2176d3e 100644 --- a/drivers/gpu/drm/amd/amdgpu/vega10_ih.c +++ b/drivers/gpu/drm/amd/amdgpu/vega10_ih.c @@ -235,8 +235,73 @@ static u32 vega10_ih_get_wptr(struct amdgpu_device *adev) */ static bool vega10_ih_prescreen_iv(struct amdgpu_device *adev) { - /* TODO: Filter known pending page faults */ + u32 ring_index = adev->irq.ih.rptr >> 2; + u32 dw0, dw3, dw4, dw5; + u16 pasid; + u64 addr, key; + struct amdgpu_vm *vm; + int r; + + dw0 = le32_to_cpu(adev->irq.ih.ring[ring_index + 0]); + dw3 = le32_to_cpu(adev->irq.ih.ring[ring_index + 3]); + dw4 = le32_to_cpu(adev->irq.ih.ring[ring_index + 4]); + dw5 = le32_to_cpu(adev->irq.ih.ring[ring_index + 5]); + + /* Filter retry page faults, let only the first one pass. If + * there are too many outstanding faults, ignore them until + * some faults get cleared. + */ + switch (dw0 & 0xff) { + case AMDGPU_IH_CLIENTID_VMC: + case AMDGPU_IH_CLIENTID_UTCL2: + break; + default: + /* Not a VM fault */ + return true; + } + + /* Not a retry fault */ + if (!(dw5 & 0x80)) + return true; + + pasid = dw3 & 0xffff; + /* No PASID, can't identify faulting process */ + if (!pasid) + return true; + + addr = ((u64)(dw5 & 0xf) << 44) | ((u64)dw4 << 12); + key = AMDGPU_VM_FAULT(pasid, addr); + r = amdgpu_ih_add_fault(adev, key); + + /* Hash table is full or the fault is already being processed, + * ignore further page faults + */ + if (r != 0) + goto ignore_iv; + + /* Track retry faults in per-VM fault FIFO. */ + spin_lock(&adev->vm_manager.pasid_lock); + vm = idr_find(&adev->vm_manager.pasid_idr, pasid); + spin_unlock(&adev->vm_manager.pasid_lock); + if (WARN_ON_ONCE(!vm)) { + /* VM not found, process it normally */ + amdgpu_ih_clear_fault(adev, key); + return true; + } + /* No locking required with single writer and single reader */ + r = kfifo_put(&vm->faults, key); + if (!r) { + /* FIFO is full. Ignore it until there is space */ + amdgpu_ih_clear_fault(adev, key); + goto ignore_iv; + } + + /* It's the first fault for this address, process it normally */ return true; + +ignore_iv: + adev->irq.ih.rptr += 32; + return false; } /** @@ -323,6 +388,14 @@ static int vega10_ih_sw_init(void *handle) adev->irq.ih.use_doorbell = true; adev->irq.ih.doorbell_index = AMDGPU_DOORBELL64_IH << 1; + adev->irq.ih.faults = kmalloc(sizeof(*adev->irq.ih.faults), GFP_KERNEL); + if (!adev->irq.ih.faults) + return -ENOMEM; + INIT_CHASH_TABLE(adev->irq.ih.faults->hash, + AMDGPU_PAGEFAULT_HASH_BITS, 8, 0); + spin_lock_init(&adev->irq.ih.faults->lock); + adev->irq.ih.faults->count = 0; + r = amdgpu_irq_init(adev); return r; @@ -335,6 +408,9 @@ static int vega10_ih_sw_fini(void *handle) amdgpu_irq_fini(adev); amdgpu_ih_ring_fini(adev); + kfree(adev->irq.ih.faults); + adev->irq.ih.faults = NULL; + return 0; } -- GitLab