diff options
Diffstat (limited to 'drivers/gpu/drm/xe/xe_gt_tlb_invalidation.c')
| -rw-r--r-- | drivers/gpu/drm/xe/xe_gt_tlb_invalidation.c | 586 |
1 files changed, 0 insertions, 586 deletions
diff --git a/drivers/gpu/drm/xe/xe_gt_tlb_invalidation.c b/drivers/gpu/drm/xe/xe_gt_tlb_invalidation.c deleted file mode 100644 index e1362e608146..000000000000 --- a/drivers/gpu/drm/xe/xe_gt_tlb_invalidation.c +++ /dev/null @@ -1,586 +0,0 @@ -// SPDX-License-Identifier: MIT -/* - * Copyright © 2023 Intel Corporation - */ - -#include "xe_gt_tlb_invalidation.h" - -#include "abi/guc_actions_abi.h" -#include "xe_device.h" -#include "xe_force_wake.h" -#include "xe_gt.h" -#include "xe_gt_printk.h" -#include "xe_guc.h" -#include "xe_guc_ct.h" -#include "xe_gt_stats.h" -#include "xe_mmio.h" -#include "xe_pm.h" -#include "xe_sriov.h" -#include "xe_trace.h" -#include "regs/xe_guc_regs.h" - -#define FENCE_STACK_BIT DMA_FENCE_FLAG_USER_BITS - -/* - * TLB inval depends on pending commands in the CT queue and then the real - * invalidation time. Double up the time to process full CT queue - * just to be on the safe side. - */ -static long tlb_timeout_jiffies(struct xe_gt *gt) -{ - /* this reflects what HW/GuC needs to process TLB inv request */ - const long hw_tlb_timeout = HZ / 4; - - /* this estimates actual delay caused by the CTB transport */ - long delay = xe_guc_ct_queue_proc_time_jiffies(>->uc.guc.ct); - - return hw_tlb_timeout + 2 * delay; -} - -static void xe_gt_tlb_invalidation_fence_fini(struct xe_gt_tlb_invalidation_fence *fence) -{ - if (WARN_ON_ONCE(!fence->gt)) - return; - - xe_pm_runtime_put(gt_to_xe(fence->gt)); - fence->gt = NULL; /* fini() should be called once */ -} - -static void -__invalidation_fence_signal(struct xe_device *xe, struct xe_gt_tlb_invalidation_fence *fence) -{ - bool stack = test_bit(FENCE_STACK_BIT, &fence->base.flags); - - trace_xe_gt_tlb_invalidation_fence_signal(xe, fence); - xe_gt_tlb_invalidation_fence_fini(fence); - dma_fence_signal(&fence->base); - if (!stack) - dma_fence_put(&fence->base); -} - -static void -invalidation_fence_signal(struct xe_device *xe, struct xe_gt_tlb_invalidation_fence *fence) -{ - list_del(&fence->link); - __invalidation_fence_signal(xe, fence); -} - -void xe_gt_tlb_invalidation_fence_signal(struct xe_gt_tlb_invalidation_fence *fence) -{ - if (WARN_ON_ONCE(!fence->gt)) - return; - - __invalidation_fence_signal(gt_to_xe(fence->gt), fence); -} - -static void xe_gt_tlb_fence_timeout(struct work_struct *work) -{ - struct xe_gt *gt = container_of(work, struct xe_gt, - tlb_invalidation.fence_tdr.work); - struct xe_device *xe = gt_to_xe(gt); - struct xe_gt_tlb_invalidation_fence *fence, *next; - - LNL_FLUSH_WORK(>->uc.guc.ct.g2h_worker); - - spin_lock_irq(>->tlb_invalidation.pending_lock); - list_for_each_entry_safe(fence, next, - >->tlb_invalidation.pending_fences, link) { - s64 since_inval_ms = ktime_ms_delta(ktime_get(), - fence->invalidation_time); - - if (msecs_to_jiffies(since_inval_ms) < tlb_timeout_jiffies(gt)) - break; - - trace_xe_gt_tlb_invalidation_fence_timeout(xe, fence); - xe_gt_err(gt, "TLB invalidation fence timeout, seqno=%d recv=%d", - fence->seqno, gt->tlb_invalidation.seqno_recv); - - fence->base.error = -ETIME; - invalidation_fence_signal(xe, fence); - } - if (!list_empty(>->tlb_invalidation.pending_fences)) - queue_delayed_work(system_wq, - >->tlb_invalidation.fence_tdr, - tlb_timeout_jiffies(gt)); - spin_unlock_irq(>->tlb_invalidation.pending_lock); -} - -/** - * xe_gt_tlb_invalidation_init_early - Initialize GT TLB invalidation state - * @gt: GT structure - * - * Initialize GT TLB invalidation state, purely software initialization, should - * be called once during driver load. - * - * Return: 0 on success, negative error code on error. - */ -int xe_gt_tlb_invalidation_init_early(struct xe_gt *gt) -{ - gt->tlb_invalidation.seqno = 1; - INIT_LIST_HEAD(>->tlb_invalidation.pending_fences); - spin_lock_init(>->tlb_invalidation.pending_lock); - spin_lock_init(>->tlb_invalidation.lock); - INIT_DELAYED_WORK(>->tlb_invalidation.fence_tdr, - xe_gt_tlb_fence_timeout); - - return 0; -} - -/** - * xe_gt_tlb_invalidation_reset - Initialize GT TLB invalidation reset - * @gt: GT structure - * - * Signal any pending invalidation fences, should be called during a GT reset - */ -void xe_gt_tlb_invalidation_reset(struct xe_gt *gt) -{ - struct xe_gt_tlb_invalidation_fence *fence, *next; - int pending_seqno; - - /* - * we can get here before the CTs are even initialized if we're wedging - * very early, in which case there are not going to be any pending - * fences so we can bail immediately. - */ - if (!xe_guc_ct_initialized(>->uc.guc.ct)) - return; - - /* - * CT channel is already disabled at this point. No new TLB requests can - * appear. - */ - - mutex_lock(>->uc.guc.ct.lock); - spin_lock_irq(>->tlb_invalidation.pending_lock); - cancel_delayed_work(>->tlb_invalidation.fence_tdr); - /* - * We might have various kworkers waiting for TLB flushes to complete - * which are not tracked with an explicit TLB fence, however at this - * stage that will never happen since the CT is already disabled, so - * make sure we signal them here under the assumption that we have - * completed a full GT reset. - */ - if (gt->tlb_invalidation.seqno == 1) - pending_seqno = TLB_INVALIDATION_SEQNO_MAX - 1; - else - pending_seqno = gt->tlb_invalidation.seqno - 1; - WRITE_ONCE(gt->tlb_invalidation.seqno_recv, pending_seqno); - - list_for_each_entry_safe(fence, next, - >->tlb_invalidation.pending_fences, link) - invalidation_fence_signal(gt_to_xe(gt), fence); - spin_unlock_irq(>->tlb_invalidation.pending_lock); - mutex_unlock(>->uc.guc.ct.lock); -} - -static bool tlb_invalidation_seqno_past(struct xe_gt *gt, int seqno) -{ - int seqno_recv = READ_ONCE(gt->tlb_invalidation.seqno_recv); - - if (seqno - seqno_recv < -(TLB_INVALIDATION_SEQNO_MAX / 2)) - return false; - - if (seqno - seqno_recv > (TLB_INVALIDATION_SEQNO_MAX / 2)) - return true; - - return seqno_recv >= seqno; -} - -static int send_tlb_invalidation(struct xe_guc *guc, - struct xe_gt_tlb_invalidation_fence *fence, - u32 *action, int len) -{ - struct xe_gt *gt = guc_to_gt(guc); - struct xe_device *xe = gt_to_xe(gt); - int seqno; - int ret; - - xe_gt_assert(gt, fence); - - /* - * XXX: The seqno algorithm relies on TLB invalidation being processed - * in order which they currently are, if that changes the algorithm will - * need to be updated. - */ - - mutex_lock(&guc->ct.lock); - seqno = gt->tlb_invalidation.seqno; - fence->seqno = seqno; - trace_xe_gt_tlb_invalidation_fence_send(xe, fence); - action[1] = seqno; - ret = xe_guc_ct_send_locked(&guc->ct, action, len, - G2H_LEN_DW_TLB_INVALIDATE, 1); - if (!ret) { - spin_lock_irq(>->tlb_invalidation.pending_lock); - /* - * We haven't actually published the TLB fence as per - * pending_fences, but in theory our seqno could have already - * been written as we acquired the pending_lock. In such a case - * we can just go ahead and signal the fence here. - */ - if (tlb_invalidation_seqno_past(gt, seqno)) { - __invalidation_fence_signal(xe, fence); - } else { - fence->invalidation_time = ktime_get(); - list_add_tail(&fence->link, - >->tlb_invalidation.pending_fences); - - if (list_is_singular(>->tlb_invalidation.pending_fences)) - queue_delayed_work(system_wq, - >->tlb_invalidation.fence_tdr, - tlb_timeout_jiffies(gt)); - } - spin_unlock_irq(>->tlb_invalidation.pending_lock); - } else { - __invalidation_fence_signal(xe, fence); - } - if (!ret) { - gt->tlb_invalidation.seqno = (gt->tlb_invalidation.seqno + 1) % - TLB_INVALIDATION_SEQNO_MAX; - if (!gt->tlb_invalidation.seqno) - gt->tlb_invalidation.seqno = 1; - } - mutex_unlock(&guc->ct.lock); - xe_gt_stats_incr(gt, XE_GT_STATS_ID_TLB_INVAL, 1); - - return ret; -} - -#define MAKE_INVAL_OP(type) ((type << XE_GUC_TLB_INVAL_TYPE_SHIFT) | \ - XE_GUC_TLB_INVAL_MODE_HEAVY << XE_GUC_TLB_INVAL_MODE_SHIFT | \ - XE_GUC_TLB_INVAL_FLUSH_CACHE) - -/** - * xe_gt_tlb_invalidation_guc - Issue a TLB invalidation on this GT for the GuC - * @gt: GT structure - * @fence: invalidation fence which will be signal on TLB invalidation - * completion - * - * Issue a TLB invalidation for the GuC. Completion of TLB is asynchronous and - * caller can use the invalidation fence to wait for completion. - * - * Return: 0 on success, negative error code on error - */ -static int xe_gt_tlb_invalidation_guc(struct xe_gt *gt, - struct xe_gt_tlb_invalidation_fence *fence) -{ - u32 action[] = { - XE_GUC_ACTION_TLB_INVALIDATION, - 0, /* seqno, replaced in send_tlb_invalidation */ - MAKE_INVAL_OP(XE_GUC_TLB_INVAL_GUC), - }; - int ret; - - ret = send_tlb_invalidation(>->uc.guc, fence, action, - ARRAY_SIZE(action)); - /* - * -ECANCELED indicates the CT is stopped for a GT reset. TLB caches - * should be nuked on a GT reset so this error can be ignored. - */ - if (ret == -ECANCELED) - return 0; - - return ret; -} - -/** - * xe_gt_tlb_invalidation_ggtt - Issue a TLB invalidation on this GT for the GGTT - * @gt: GT structure - * - * Issue a TLB invalidation for the GGTT. Completion of TLB invalidation is - * synchronous. - * - * Return: 0 on success, negative error code on error - */ -int xe_gt_tlb_invalidation_ggtt(struct xe_gt *gt) -{ - struct xe_device *xe = gt_to_xe(gt); - unsigned int fw_ref; - - if (xe_guc_ct_enabled(>->uc.guc.ct) && - gt->uc.guc.submission_state.enabled) { - struct xe_gt_tlb_invalidation_fence fence; - int ret; - - xe_gt_tlb_invalidation_fence_init(gt, &fence, true); - ret = xe_gt_tlb_invalidation_guc(gt, &fence); - if (ret) - return ret; - - xe_gt_tlb_invalidation_fence_wait(&fence); - } else if (xe_device_uc_enabled(xe) && !xe_device_wedged(xe)) { - struct xe_mmio *mmio = >->mmio; - - if (IS_SRIOV_VF(xe)) - return 0; - - fw_ref = xe_force_wake_get(gt_to_fw(gt), XE_FW_GT); - if (xe->info.platform == XE_PVC || GRAPHICS_VER(xe) >= 20) { - xe_mmio_write32(mmio, PVC_GUC_TLB_INV_DESC1, - PVC_GUC_TLB_INV_DESC1_INVALIDATE); - xe_mmio_write32(mmio, PVC_GUC_TLB_INV_DESC0, - PVC_GUC_TLB_INV_DESC0_VALID); - } else { - xe_mmio_write32(mmio, GUC_TLB_INV_CR, - GUC_TLB_INV_CR_INVALIDATE); - } - xe_force_wake_put(gt_to_fw(gt), fw_ref); - } - - return 0; -} - -/* - * Ensure that roundup_pow_of_two(length) doesn't overflow. - * Note that roundup_pow_of_two() operates on unsigned long, - * not on u64. - */ -#define MAX_RANGE_TLB_INVALIDATION_LENGTH (rounddown_pow_of_two(ULONG_MAX)) - -/** - * xe_gt_tlb_invalidation_range - Issue a TLB invalidation on this GT for an - * address range - * - * @gt: GT structure - * @fence: invalidation fence which will be signal on TLB invalidation - * completion - * @start: start address - * @end: end address - * @asid: address space id - * - * Issue a range based TLB invalidation if supported, if not fallback to a full - * TLB invalidation. Completion of TLB is asynchronous and caller can use - * the invalidation fence to wait for completion. - * - * Return: Negative error code on error, 0 on success - */ -int xe_gt_tlb_invalidation_range(struct xe_gt *gt, - struct xe_gt_tlb_invalidation_fence *fence, - u64 start, u64 end, u32 asid) -{ - struct xe_device *xe = gt_to_xe(gt); -#define MAX_TLB_INVALIDATION_LEN 7 - u32 action[MAX_TLB_INVALIDATION_LEN]; - u64 length = end - start; - int len = 0; - - xe_gt_assert(gt, fence); - - /* Execlists not supported */ - if (gt_to_xe(gt)->info.force_execlist) { - __invalidation_fence_signal(xe, fence); - return 0; - } - - action[len++] = XE_GUC_ACTION_TLB_INVALIDATION; - action[len++] = 0; /* seqno, replaced in send_tlb_invalidation */ - if (!xe->info.has_range_tlb_invalidation || - length > MAX_RANGE_TLB_INVALIDATION_LENGTH) { - action[len++] = MAKE_INVAL_OP(XE_GUC_TLB_INVAL_FULL); - } else { - u64 orig_start = start; - u64 align; - - if (length < SZ_4K) - length = SZ_4K; - - /* - * We need to invalidate a higher granularity if start address - * is not aligned to length. When start is not aligned with - * length we need to find the length large enough to create an - * address mask covering the required range. - */ - align = roundup_pow_of_two(length); - start = ALIGN_DOWN(start, align); - end = ALIGN(end, align); - length = align; - while (start + length < end) { - length <<= 1; - start = ALIGN_DOWN(orig_start, length); - } - - /* - * Minimum invalidation size for a 2MB page that the hardware - * expects is 16MB - */ - if (length >= SZ_2M) { - length = max_t(u64, SZ_16M, length); - start = ALIGN_DOWN(orig_start, length); - } - - xe_gt_assert(gt, length >= SZ_4K); - xe_gt_assert(gt, is_power_of_2(length)); - xe_gt_assert(gt, !(length & GENMASK(ilog2(SZ_16M) - 1, - ilog2(SZ_2M) + 1))); - xe_gt_assert(gt, IS_ALIGNED(start, length)); - - action[len++] = MAKE_INVAL_OP(XE_GUC_TLB_INVAL_PAGE_SELECTIVE); - action[len++] = asid; - action[len++] = lower_32_bits(start); - action[len++] = upper_32_bits(start); - action[len++] = ilog2(length) - ilog2(SZ_4K); - } - - xe_gt_assert(gt, len <= MAX_TLB_INVALIDATION_LEN); - - return send_tlb_invalidation(>->uc.guc, fence, action, len); -} - -/** - * xe_gt_tlb_invalidation_vm - Issue a TLB invalidation on this GT for a VM - * @gt: graphics tile - * @vm: VM to invalidate - * - * Invalidate entire VM's address space - */ -void xe_gt_tlb_invalidation_vm(struct xe_gt *gt, struct xe_vm *vm) -{ - struct xe_gt_tlb_invalidation_fence fence; - u64 range = 1ull << vm->xe->info.va_bits; - int ret; - - xe_gt_tlb_invalidation_fence_init(gt, &fence, true); - - ret = xe_gt_tlb_invalidation_range(gt, &fence, 0, range, vm->usm.asid); - if (ret < 0) - return; - - xe_gt_tlb_invalidation_fence_wait(&fence); -} - -/** - * xe_gt_tlb_invalidation_vma - Issue a TLB invalidation on this GT for a VMA - * @gt: GT structure - * @fence: invalidation fence which will be signal on TLB invalidation - * completion, can be NULL - * @vma: VMA to invalidate - * - * Issue a range based TLB invalidation if supported, if not fallback to a full - * TLB invalidation. Completion of TLB is asynchronous and caller can use - * the invalidation fence to wait for completion. - * - * Return: Negative error code on error, 0 on success - */ -int xe_gt_tlb_invalidation_vma(struct xe_gt *gt, - struct xe_gt_tlb_invalidation_fence *fence, - struct xe_vma *vma) -{ - xe_gt_assert(gt, vma); - - return xe_gt_tlb_invalidation_range(gt, fence, xe_vma_start(vma), - xe_vma_end(vma), - xe_vma_vm(vma)->usm.asid); -} - -/** - * xe_guc_tlb_invalidation_done_handler - TLB invalidation done handler - * @guc: guc - * @msg: message indicating TLB invalidation done - * @len: length of message - * - * Parse seqno of TLB invalidation, wake any waiters for seqno, and signal any - * invalidation fences for seqno. Algorithm for this depends on seqno being - * received in-order and asserts this assumption. - * - * Return: 0 on success, -EPROTO for malformed messages. - */ -int xe_guc_tlb_invalidation_done_handler(struct xe_guc *guc, u32 *msg, u32 len) -{ - struct xe_gt *gt = guc_to_gt(guc); - struct xe_device *xe = gt_to_xe(gt); - struct xe_gt_tlb_invalidation_fence *fence, *next; - unsigned long flags; - - if (unlikely(len != 1)) - return -EPROTO; - - /* - * This can also be run both directly from the IRQ handler and also in - * process_g2h_msg(). Only one may process any individual CT message, - * however the order they are processed here could result in skipping a - * seqno. To handle that we just process all the seqnos from the last - * seqno_recv up to and including the one in msg[0]. The delta should be - * very small so there shouldn't be much of pending_fences we actually - * need to iterate over here. - * - * From GuC POV we expect the seqnos to always appear in-order, so if we - * see something later in the timeline we can be sure that anything - * appearing earlier has already signalled, just that we have yet to - * officially process the CT message like if racing against - * process_g2h_msg(). - */ - spin_lock_irqsave(>->tlb_invalidation.pending_lock, flags); - if (tlb_invalidation_seqno_past(gt, msg[0])) { - spin_unlock_irqrestore(>->tlb_invalidation.pending_lock, flags); - return 0; - } - - WRITE_ONCE(gt->tlb_invalidation.seqno_recv, msg[0]); - - list_for_each_entry_safe(fence, next, - >->tlb_invalidation.pending_fences, link) { - trace_xe_gt_tlb_invalidation_fence_recv(xe, fence); - - if (!tlb_invalidation_seqno_past(gt, fence->seqno)) - break; - - invalidation_fence_signal(xe, fence); - } - - if (!list_empty(>->tlb_invalidation.pending_fences)) - mod_delayed_work(system_wq, - >->tlb_invalidation.fence_tdr, - tlb_timeout_jiffies(gt)); - else - cancel_delayed_work(>->tlb_invalidation.fence_tdr); - - spin_unlock_irqrestore(>->tlb_invalidation.pending_lock, flags); - - return 0; -} - -static const char * -invalidation_fence_get_driver_name(struct dma_fence *dma_fence) -{ - return "xe"; -} - -static const char * -invalidation_fence_get_timeline_name(struct dma_fence *dma_fence) -{ - return "invalidation_fence"; -} - -static const struct dma_fence_ops invalidation_fence_ops = { - .get_driver_name = invalidation_fence_get_driver_name, - .get_timeline_name = invalidation_fence_get_timeline_name, -}; - -/** - * xe_gt_tlb_invalidation_fence_init - Initialize TLB invalidation fence - * @gt: GT - * @fence: TLB invalidation fence to initialize - * @stack: fence is stack variable - * - * Initialize TLB invalidation fence for use. xe_gt_tlb_invalidation_fence_fini - * will be automatically called when fence is signalled (all fences must signal), - * even on error. - */ -void xe_gt_tlb_invalidation_fence_init(struct xe_gt *gt, - struct xe_gt_tlb_invalidation_fence *fence, - bool stack) -{ - xe_pm_runtime_get_noresume(gt_to_xe(gt)); - - spin_lock_irq(>->tlb_invalidation.lock); - dma_fence_init(&fence->base, &invalidation_fence_ops, - >->tlb_invalidation.lock, - dma_fence_context_alloc(1), 1); - spin_unlock_irq(>->tlb_invalidation.lock); - INIT_LIST_HEAD(&fence->link); - if (stack) - set_bit(FENCE_STACK_BIT, &fence->base.flags); - else - dma_fence_get(&fence->base); - fence->gt = gt; -} |