diff options
Diffstat (limited to 'drivers/gpu/drm/xe/xe_guc_ct.c')
| -rw-r--r-- | drivers/gpu/drm/xe/xe_guc_ct.c | 1196 |
1 files changed, 1196 insertions, 0 deletions
diff --git a/drivers/gpu/drm/xe/xe_guc_ct.c b/drivers/gpu/drm/xe/xe_guc_ct.c new file mode 100644 index 000000000000..61a424c41779 --- /dev/null +++ b/drivers/gpu/drm/xe/xe_guc_ct.c @@ -0,0 +1,1196 @@ +// SPDX-License-Identifier: MIT +/* + * Copyright © 2022 Intel Corporation + */ + +#include <linux/bitfield.h> +#include <linux/circ_buf.h> +#include <linux/delay.h> + +#include <drm/drm_managed.h> + +#include "xe_bo.h" +#include "xe_device.h" +#include "xe_gt.h" +#include "xe_guc.h" +#include "xe_guc_ct.h" +#include "xe_gt_pagefault.h" +#include "xe_guc_submit.h" +#include "xe_map.h" +#include "xe_trace.h" + +/* Used when a CT send wants to block and / or receive data */ +struct g2h_fence { + wait_queue_head_t wq; + u32 *response_buffer; + u32 seqno; + u16 response_len; + u16 error; + u16 hint; + u16 reason; + bool retry; + bool fail; + bool done; +}; + +static void g2h_fence_init(struct g2h_fence *g2h_fence, u32 *response_buffer) +{ + g2h_fence->response_buffer = response_buffer; + g2h_fence->response_len = 0; + g2h_fence->fail = false; + g2h_fence->retry = false; + g2h_fence->done = false; + g2h_fence->seqno = ~0x0; +} + +static bool g2h_fence_needs_alloc(struct g2h_fence *g2h_fence) +{ + return g2h_fence->seqno == ~0x0; +} + +static struct xe_guc * +ct_to_guc(struct xe_guc_ct *ct) +{ + return container_of(ct, struct xe_guc, ct); +} + +static struct xe_gt * +ct_to_gt(struct xe_guc_ct *ct) +{ + return container_of(ct, struct xe_gt, uc.guc.ct); +} + +static struct xe_device * +ct_to_xe(struct xe_guc_ct *ct) +{ + return gt_to_xe(ct_to_gt(ct)); +} + +/** + * DOC: GuC CTB Blob + * + * We allocate single blob to hold both CTB descriptors and buffers: + * + * +--------+-----------------------------------------------+------+ + * | offset | contents | size | + * +========+===============================================+======+ + * | 0x0000 | H2G CTB Descriptor (send) | | + * +--------+-----------------------------------------------+ 4K | + * | 0x0800 | G2H CTB Descriptor (g2h) | | + * +--------+-----------------------------------------------+------+ + * | 0x1000 | H2G CT Buffer (send) | n*4K | + * | | | | + * +--------+-----------------------------------------------+------+ + * | 0x1000 | G2H CT Buffer (g2h) | m*4K | + * | + n*4K | | | + * +--------+-----------------------------------------------+------+ + * + * Size of each ``CT Buffer`` must be multiple of 4K. + * We don't expect too many messages in flight at any time, unless we are + * using the GuC submission. In that case each request requires a minimum + * 2 dwords which gives us a maximum 256 queue'd requests. Hopefully this + * enough space to avoid backpressure on the driver. We increase the size + * of the receive buffer (relative to the send) to ensure a G2H response + * CTB has a landing spot. + */ + +#define CTB_DESC_SIZE ALIGN(sizeof(struct guc_ct_buffer_desc), SZ_2K) +#define CTB_H2G_BUFFER_SIZE (SZ_4K) +#define CTB_G2H_BUFFER_SIZE (4 * CTB_H2G_BUFFER_SIZE) +#define G2H_ROOM_BUFFER_SIZE (CTB_G2H_BUFFER_SIZE / 4) + +static size_t guc_ct_size(void) +{ + return 2 * CTB_DESC_SIZE + CTB_H2G_BUFFER_SIZE + + CTB_G2H_BUFFER_SIZE; +} + +static void guc_ct_fini(struct drm_device *drm, void *arg) +{ + struct xe_guc_ct *ct = arg; + + xa_destroy(&ct->fence_lookup); + xe_bo_unpin_map_no_vm(ct->bo); +} + +static void g2h_worker_func(struct work_struct *w); + +static void primelockdep(struct xe_guc_ct *ct) +{ + if (!IS_ENABLED(CONFIG_LOCKDEP)) + return; + + fs_reclaim_acquire(GFP_KERNEL); + might_lock(&ct->lock); + fs_reclaim_release(GFP_KERNEL); +} + +int xe_guc_ct_init(struct xe_guc_ct *ct) +{ + struct xe_device *xe = ct_to_xe(ct); + struct xe_gt *gt = ct_to_gt(ct); + struct xe_bo *bo; + int err; + + XE_BUG_ON(guc_ct_size() % PAGE_SIZE); + + mutex_init(&ct->lock); + spin_lock_init(&ct->fast_lock); + xa_init(&ct->fence_lookup); + ct->fence_context = dma_fence_context_alloc(1); + INIT_WORK(&ct->g2h_worker, g2h_worker_func); + init_waitqueue_head(&ct->wq); + + primelockdep(ct); + + bo = xe_bo_create_pin_map(xe, gt, NULL, guc_ct_size(), + ttm_bo_type_kernel, + XE_BO_CREATE_VRAM_IF_DGFX(gt) | + XE_BO_CREATE_GGTT_BIT); + if (IS_ERR(bo)) + return PTR_ERR(bo); + + ct->bo = bo; + + err = drmm_add_action_or_reset(&xe->drm, guc_ct_fini, ct); + if (err) + return err; + + return 0; +} + +#define desc_read(xe_, guc_ctb__, field_) \ + xe_map_rd_field(xe_, &guc_ctb__->desc, 0, \ + struct guc_ct_buffer_desc, field_) + +#define desc_write(xe_, guc_ctb__, field_, val_) \ + xe_map_wr_field(xe_, &guc_ctb__->desc, 0, \ + struct guc_ct_buffer_desc, field_, val_) + +static void guc_ct_ctb_h2g_init(struct xe_device *xe, struct guc_ctb *h2g, + struct iosys_map *map) +{ + h2g->size = CTB_H2G_BUFFER_SIZE / sizeof(u32); + h2g->resv_space = 0; + h2g->tail = 0; + h2g->head = 0; + h2g->space = CIRC_SPACE(h2g->tail, h2g->head, h2g->size) - + h2g->resv_space; + h2g->broken = false; + + h2g->desc = *map; + xe_map_memset(xe, &h2g->desc, 0, 0, sizeof(struct guc_ct_buffer_desc)); + + h2g->cmds = IOSYS_MAP_INIT_OFFSET(map, CTB_DESC_SIZE * 2); +} + +static void guc_ct_ctb_g2h_init(struct xe_device *xe, struct guc_ctb *g2h, + struct iosys_map *map) +{ + g2h->size = CTB_G2H_BUFFER_SIZE / sizeof(u32); + g2h->resv_space = G2H_ROOM_BUFFER_SIZE / sizeof(u32); + g2h->head = 0; + g2h->tail = 0; + g2h->space = CIRC_SPACE(g2h->tail, g2h->head, g2h->size) - + g2h->resv_space; + g2h->broken = false; + + g2h->desc = IOSYS_MAP_INIT_OFFSET(map, CTB_DESC_SIZE); + xe_map_memset(xe, &g2h->desc, 0, 0, sizeof(struct guc_ct_buffer_desc)); + + g2h->cmds = IOSYS_MAP_INIT_OFFSET(map, CTB_DESC_SIZE * 2 + + CTB_H2G_BUFFER_SIZE); +} + +static int guc_ct_ctb_h2g_register(struct xe_guc_ct *ct) +{ + struct xe_guc *guc = ct_to_guc(ct); + u32 desc_addr, ctb_addr, size; + int err; + + desc_addr = xe_bo_ggtt_addr(ct->bo); + ctb_addr = xe_bo_ggtt_addr(ct->bo) + CTB_DESC_SIZE * 2; + size = ct->ctbs.h2g.size * sizeof(u32); + + err = xe_guc_self_cfg64(guc, + GUC_KLV_SELF_CFG_H2G_CTB_DESCRIPTOR_ADDR_KEY, + desc_addr); + if (err) + return err; + + err = xe_guc_self_cfg64(guc, + GUC_KLV_SELF_CFG_H2G_CTB_ADDR_KEY, + ctb_addr); + if (err) + return err; + + return xe_guc_self_cfg32(guc, + GUC_KLV_SELF_CFG_H2G_CTB_SIZE_KEY, + size); +} + +static int guc_ct_ctb_g2h_register(struct xe_guc_ct *ct) +{ + struct xe_guc *guc = ct_to_guc(ct); + u32 desc_addr, ctb_addr, size; + int err; + + desc_addr = xe_bo_ggtt_addr(ct->bo) + CTB_DESC_SIZE; + ctb_addr = xe_bo_ggtt_addr(ct->bo) + CTB_DESC_SIZE * 2 + + CTB_H2G_BUFFER_SIZE; + size = ct->ctbs.g2h.size * sizeof(u32); + + err = xe_guc_self_cfg64(guc, + GUC_KLV_SELF_CFG_G2H_CTB_DESCRIPTOR_ADDR_KEY, + desc_addr); + if (err) + return err; + + err = xe_guc_self_cfg64(guc, + GUC_KLV_SELF_CFG_G2H_CTB_ADDR_KEY, + ctb_addr); + if (err) + return err; + + return xe_guc_self_cfg32(guc, + GUC_KLV_SELF_CFG_G2H_CTB_SIZE_KEY, + size); +} + +static int guc_ct_control_toggle(struct xe_guc_ct *ct, bool enable) +{ + u32 request[HOST2GUC_CONTROL_CTB_REQUEST_MSG_LEN] = { + FIELD_PREP(GUC_HXG_MSG_0_ORIGIN, GUC_HXG_ORIGIN_HOST) | + FIELD_PREP(GUC_HXG_MSG_0_TYPE, GUC_HXG_TYPE_REQUEST) | + FIELD_PREP(GUC_HXG_REQUEST_MSG_0_ACTION, + GUC_ACTION_HOST2GUC_CONTROL_CTB), + FIELD_PREP(HOST2GUC_CONTROL_CTB_REQUEST_MSG_1_CONTROL, + enable ? GUC_CTB_CONTROL_ENABLE : + GUC_CTB_CONTROL_DISABLE), + }; + int ret = xe_guc_send_mmio(ct_to_guc(ct), request, ARRAY_SIZE(request)); + + return ret > 0 ? -EPROTO : ret; +} + +int xe_guc_ct_enable(struct xe_guc_ct *ct) +{ + struct xe_device *xe = ct_to_xe(ct); + int err; + + XE_BUG_ON(ct->enabled); + + guc_ct_ctb_h2g_init(xe, &ct->ctbs.h2g, &ct->bo->vmap); + guc_ct_ctb_g2h_init(xe, &ct->ctbs.g2h, &ct->bo->vmap); + + err = guc_ct_ctb_h2g_register(ct); + if (err) + goto err_out; + + err = guc_ct_ctb_g2h_register(ct); + if (err) + goto err_out; + + err = guc_ct_control_toggle(ct, true); + if (err) + goto err_out; + + mutex_lock(&ct->lock); + ct->g2h_outstanding = 0; + ct->enabled = true; + mutex_unlock(&ct->lock); + + smp_mb(); + wake_up_all(&ct->wq); + drm_dbg(&xe->drm, "GuC CT communication channel enabled\n"); + + return 0; + +err_out: + drm_err(&xe->drm, "Failed to enabled CT (%d)\n", err); + + return err; +} + +void xe_guc_ct_disable(struct xe_guc_ct *ct) +{ + mutex_lock(&ct->lock); + ct->enabled = false; + mutex_unlock(&ct->lock); + + xa_destroy(&ct->fence_lookup); +} + +static bool h2g_has_room(struct xe_guc_ct *ct, u32 cmd_len) +{ + struct guc_ctb *h2g = &ct->ctbs.h2g; + + lockdep_assert_held(&ct->lock); + + if (cmd_len > h2g->space) { + h2g->head = desc_read(ct_to_xe(ct), h2g, head); + h2g->space = CIRC_SPACE(h2g->tail, h2g->head, h2g->size) - + h2g->resv_space; + if (cmd_len > h2g->space) + return false; + } + + return true; +} + +static bool g2h_has_room(struct xe_guc_ct *ct, u32 g2h_len) +{ + lockdep_assert_held(&ct->lock); + + return ct->ctbs.g2h.space > g2h_len; +} + +static int has_room(struct xe_guc_ct *ct, u32 cmd_len, u32 g2h_len) +{ + lockdep_assert_held(&ct->lock); + + if (!g2h_has_room(ct, g2h_len) || !h2g_has_room(ct, cmd_len)) + return -EBUSY; + + return 0; +} + +static void h2g_reserve_space(struct xe_guc_ct *ct, u32 cmd_len) +{ + lockdep_assert_held(&ct->lock); + ct->ctbs.h2g.space -= cmd_len; +} + +static void g2h_reserve_space(struct xe_guc_ct *ct, u32 g2h_len, u32 num_g2h) +{ + XE_BUG_ON(g2h_len > ct->ctbs.g2h.space); + + if (g2h_len) { + spin_lock_irq(&ct->fast_lock); + ct->ctbs.g2h.space -= g2h_len; + ct->g2h_outstanding += num_g2h; + spin_unlock_irq(&ct->fast_lock); + } +} + +static void __g2h_release_space(struct xe_guc_ct *ct, u32 g2h_len) +{ + lockdep_assert_held(&ct->fast_lock); + XE_WARN_ON(ct->ctbs.g2h.space + g2h_len > + ct->ctbs.g2h.size - ct->ctbs.g2h.resv_space); + + ct->ctbs.g2h.space += g2h_len; + --ct->g2h_outstanding; +} + +static void g2h_release_space(struct xe_guc_ct *ct, u32 g2h_len) +{ + spin_lock_irq(&ct->fast_lock); + __g2h_release_space(ct, g2h_len); + spin_unlock_irq(&ct->fast_lock); +} + +static int h2g_write(struct xe_guc_ct *ct, const u32 *action, u32 len, + u32 ct_fence_value, bool want_response) +{ + struct xe_device *xe = ct_to_xe(ct); + struct guc_ctb *h2g = &ct->ctbs.h2g; + u32 cmd[GUC_CTB_MSG_MAX_LEN / sizeof(u32)]; + u32 cmd_len = len + GUC_CTB_HDR_LEN; + u32 cmd_idx = 0, i; + u32 tail = h2g->tail; + struct iosys_map map = IOSYS_MAP_INIT_OFFSET(&h2g->cmds, + tail * sizeof(u32)); + + lockdep_assert_held(&ct->lock); + XE_BUG_ON(len * sizeof(u32) > GUC_CTB_MSG_MAX_LEN); + XE_BUG_ON(tail > h2g->size); + + /* Command will wrap, zero fill (NOPs), return and check credits again */ + if (tail + cmd_len > h2g->size) { + xe_map_memset(xe, &map, 0, 0, (h2g->size - tail) * sizeof(u32)); + h2g_reserve_space(ct, (h2g->size - tail)); + h2g->tail = 0; + desc_write(xe, h2g, tail, h2g->tail); + + return -EAGAIN; + } + + /* + * dw0: CT header (including fence) + * dw1: HXG header (including action code) + * dw2+: action data + */ + cmd[cmd_idx++] = FIELD_PREP(GUC_CTB_MSG_0_FORMAT, GUC_CTB_FORMAT_HXG) | + FIELD_PREP(GUC_CTB_MSG_0_NUM_DWORDS, len) | + FIELD_PREP(GUC_CTB_MSG_0_FENCE, ct_fence_value); + if (want_response) { + cmd[cmd_idx++] = + FIELD_PREP(GUC_HXG_MSG_0_TYPE, GUC_HXG_TYPE_REQUEST) | + FIELD_PREP(GUC_HXG_EVENT_MSG_0_ACTION | + GUC_HXG_EVENT_MSG_0_DATA0, action[0]); + } else { + cmd[cmd_idx++] = + FIELD_PREP(GUC_HXG_MSG_0_TYPE, GUC_HXG_TYPE_EVENT) | + FIELD_PREP(GUC_HXG_EVENT_MSG_0_ACTION | + GUC_HXG_EVENT_MSG_0_DATA0, action[0]); + } + for (i = 1; i < len; ++i) + cmd[cmd_idx++] = action[i]; + + /* Write H2G ensuring visable before descriptor update */ + xe_map_memcpy_to(xe, &map, 0, cmd, cmd_len * sizeof(u32)); + xe_device_wmb(ct_to_xe(ct)); + + /* Update local copies */ + h2g->tail = (tail + cmd_len) % h2g->size; + h2g_reserve_space(ct, cmd_len); + + /* Update descriptor */ + desc_write(xe, h2g, tail, h2g->tail); + + return 0; +} + +static int __guc_ct_send_locked(struct xe_guc_ct *ct, const u32 *action, + u32 len, u32 g2h_len, u32 num_g2h, + struct g2h_fence *g2h_fence) +{ + int ret; + + XE_BUG_ON(g2h_len && g2h_fence); + XE_BUG_ON(num_g2h && g2h_fence); + XE_BUG_ON(g2h_len && !num_g2h); + XE_BUG_ON(!g2h_len && num_g2h); + lockdep_assert_held(&ct->lock); + + if (unlikely(ct->ctbs.h2g.broken)) { + ret = -EPIPE; + goto out; + } + + if (unlikely(!ct->enabled)) { + ret = -ENODEV; + goto out; + } + + if (g2h_fence) { + g2h_len = GUC_CTB_HXG_MSG_MAX_LEN; + num_g2h = 1; + + if (g2h_fence_needs_alloc(g2h_fence)) { + void *ptr; + + g2h_fence->seqno = (ct->fence_seqno++ & 0xffff); + init_waitqueue_head(&g2h_fence->wq); + ptr = xa_store(&ct->fence_lookup, + g2h_fence->seqno, + g2h_fence, GFP_ATOMIC); + if (IS_ERR(ptr)) { + ret = PTR_ERR(ptr); + goto out; + } + } + } + + xe_device_mem_access_get(ct_to_xe(ct)); +retry: + ret = has_room(ct, len + GUC_CTB_HDR_LEN, g2h_len); + if (unlikely(ret)) + goto put_wa; + + ret = h2g_write(ct, action, len, g2h_fence ? g2h_fence->seqno : 0, + !!g2h_fence); + if (unlikely(ret)) { + if (ret == -EAGAIN) + goto retry; + goto put_wa; + } + + g2h_reserve_space(ct, g2h_len, num_g2h); + xe_guc_notify(ct_to_guc(ct)); +put_wa: + xe_device_mem_access_put(ct_to_xe(ct)); +out: + + return ret; +} + +static void kick_reset(struct xe_guc_ct *ct) +{ + xe_gt_reset_async(ct_to_gt(ct)); +} + +static int dequeue_one_g2h(struct xe_guc_ct *ct); + +static int guc_ct_send_locked(struct xe_guc_ct *ct, const u32 *action, u32 len, + u32 g2h_len, u32 num_g2h, + struct g2h_fence *g2h_fence) +{ + struct drm_device *drm = &ct_to_xe(ct)->drm; + struct drm_printer p = drm_info_printer(drm->dev); + unsigned int sleep_period_ms = 1; + int ret; + + XE_BUG_ON(g2h_len && g2h_fence); + lockdep_assert_held(&ct->lock); + +try_again: + ret = __guc_ct_send_locked(ct, action, len, g2h_len, num_g2h, + g2h_fence); + + /* + * We wait to try to restore credits for about 1 second before bailing. + * In the case of H2G credits we have no choice but just to wait for the + * GuC to consume H2Gs in the channel so we use a wait / sleep loop. In + * the case of G2H we process any G2H in the channel, hopefully freeing + * credits as we consume the G2H messages. + */ + if (unlikely(ret == -EBUSY && + !h2g_has_room(ct, len + GUC_CTB_HDR_LEN))) { + struct guc_ctb *h2g = &ct->ctbs.h2g; + + if (sleep_period_ms == 1024) + goto broken; + + trace_xe_guc_ct_h2g_flow_control(h2g->head, h2g->tail, + h2g->size, h2g->space, + len + GUC_CTB_HDR_LEN); + msleep(sleep_period_ms); + sleep_period_ms <<= 1; + + goto try_again; + } else if (unlikely(ret == -EBUSY)) { + struct xe_device *xe = ct_to_xe(ct); + struct guc_ctb *g2h = &ct->ctbs.g2h; + + trace_xe_guc_ct_g2h_flow_control(g2h->head, + desc_read(xe, g2h, tail), + g2h->size, g2h->space, + g2h_fence ? + GUC_CTB_HXG_MSG_MAX_LEN : + g2h_len); + +#define g2h_avail(ct) \ + (desc_read(ct_to_xe(ct), (&ct->ctbs.g2h), tail) != ct->ctbs.g2h.head) + if (!wait_event_timeout(ct->wq, !ct->g2h_outstanding || + g2h_avail(ct), HZ)) + goto broken; +#undef g2h_avail + + if (dequeue_one_g2h(ct) < 0) + goto broken; + + goto try_again; + } + + return ret; + +broken: + drm_err(drm, "No forward process on H2G, reset required"); + xe_guc_ct_print(ct, &p); + ct->ctbs.h2g.broken = true; + + return -EDEADLK; +} + +static int guc_ct_send(struct xe_guc_ct *ct, const u32 *action, u32 len, + u32 g2h_len, u32 num_g2h, struct g2h_fence *g2h_fence) +{ + int ret; + + XE_BUG_ON(g2h_len && g2h_fence); + + mutex_lock(&ct->lock); + ret = guc_ct_send_locked(ct, action, len, g2h_len, num_g2h, g2h_fence); + mutex_unlock(&ct->lock); + + return ret; +} + +int xe_guc_ct_send(struct xe_guc_ct *ct, const u32 *action, u32 len, + u32 g2h_len, u32 num_g2h) +{ + int ret; + + ret = guc_ct_send(ct, action, len, g2h_len, num_g2h, NULL); + if (ret == -EDEADLK) + kick_reset(ct); + + return ret; +} + +int xe_guc_ct_send_locked(struct xe_guc_ct *ct, const u32 *action, u32 len, + u32 g2h_len, u32 num_g2h) +{ + int ret; + + ret = guc_ct_send_locked(ct, action, len, g2h_len, num_g2h, NULL); + if (ret == -EDEADLK) + kick_reset(ct); + + return ret; +} + +int xe_guc_ct_send_g2h_handler(struct xe_guc_ct *ct, const u32 *action, u32 len) +{ + int ret; + + lockdep_assert_held(&ct->lock); + + ret = guc_ct_send_locked(ct, action, len, 0, 0, NULL); + if (ret == -EDEADLK) + kick_reset(ct); + + return ret; +} + +/* + * Check if a GT reset is in progress or will occur and if GT reset brought the + * CT back up. Randomly picking 5 seconds for an upper limit to do a GT a reset. + */ +static bool retry_failure(struct xe_guc_ct *ct, int ret) +{ + if (!(ret == -EDEADLK || ret == -EPIPE || ret == -ENODEV)) + return false; + +#define ct_alive(ct) \ + (ct->enabled && !ct->ctbs.h2g.broken && !ct->ctbs.g2h.broken) + if (!wait_event_interruptible_timeout(ct->wq, ct_alive(ct), HZ * 5)) + return false; +#undef ct_alive + + return true; +} + +static int guc_ct_send_recv(struct xe_guc_ct *ct, const u32 *action, u32 len, + u32 *response_buffer, bool no_fail) +{ + struct xe_device *xe = ct_to_xe(ct); + struct g2h_fence g2h_fence; + int ret = 0; + + /* + * We use a fence to implement blocking sends / receiving response data. + * The seqno of the fence is sent in the H2G, returned in the G2H, and + * an xarray is used as storage media with the seqno being to key. + * Fields in the fence hold success, failure, retry status and the + * response data. Safe to allocate on the stack as the xarray is the + * only reference and it cannot be present after this function exits. + */ +retry: + g2h_fence_init(&g2h_fence, response_buffer); +retry_same_fence: + ret = guc_ct_send(ct, action, len, 0, 0, &g2h_fence); + if (unlikely(ret == -ENOMEM)) { + void *ptr; + + /* Retry allocation /w GFP_KERNEL */ + ptr = xa_store(&ct->fence_lookup, + g2h_fence.seqno, + &g2h_fence, GFP_KERNEL); + if (IS_ERR(ptr)) { + return PTR_ERR(ptr); + } + + goto retry_same_fence; + } else if (unlikely(ret)) { + if (ret == -EDEADLK) + kick_reset(ct); + + if (no_fail && retry_failure(ct, ret)) + goto retry_same_fence; + + if (!g2h_fence_needs_alloc(&g2h_fence)) + xa_erase_irq(&ct->fence_lookup, g2h_fence.seqno); + + return ret; + } + + ret = wait_event_timeout(g2h_fence.wq, g2h_fence.done, HZ); + if (!ret) { + drm_err(&xe->drm, "Timed out wait for G2H, fence %u, action %04x", + g2h_fence.seqno, action[0]); + xa_erase_irq(&ct->fence_lookup, g2h_fence.seqno); + return -ETIME; + } + + if (g2h_fence.retry) { + drm_warn(&xe->drm, "Send retry, action 0x%04x, reason %d", + action[0], g2h_fence.reason); + goto retry; + } + if (g2h_fence.fail) { + drm_err(&xe->drm, "Send failed, action 0x%04x, error %d, hint %d", + action[0], g2h_fence.error, g2h_fence.hint); + ret = -EIO; + } + + return ret > 0 ? 0 : ret; +} + +int xe_guc_ct_send_recv(struct xe_guc_ct *ct, const u32 *action, u32 len, + u32 *response_buffer) +{ + return guc_ct_send_recv(ct, action, len, response_buffer, false); +} + +int xe_guc_ct_send_recv_no_fail(struct xe_guc_ct *ct, const u32 *action, + u32 len, u32 *response_buffer) +{ + return guc_ct_send_recv(ct, action, len, response_buffer, true); +} + +static int parse_g2h_event(struct xe_guc_ct *ct, u32 *msg, u32 len) +{ + u32 action = FIELD_GET(GUC_HXG_EVENT_MSG_0_ACTION, msg[1]); + + lockdep_assert_held(&ct->lock); + + switch (action) { + case XE_GUC_ACTION_SCHED_CONTEXT_MODE_DONE: + case XE_GUC_ACTION_DEREGISTER_CONTEXT_DONE: + case XE_GUC_ACTION_SCHED_ENGINE_MODE_DONE: + case XE_GUC_ACTION_TLB_INVALIDATION_DONE: + g2h_release_space(ct, len); + } + + return 0; +} + +static int parse_g2h_response(struct xe_guc_ct *ct, u32 *msg, u32 len) +{ + struct xe_device *xe = ct_to_xe(ct); + u32 response_len = len - GUC_CTB_MSG_MIN_LEN; + u32 fence = FIELD_GET(GUC_CTB_MSG_0_FENCE, msg[0]); + u32 type = FIELD_GET(GUC_HXG_MSG_0_TYPE, msg[1]); + struct g2h_fence *g2h_fence; + + lockdep_assert_held(&ct->lock); + + g2h_fence = xa_erase(&ct->fence_lookup, fence); + if (unlikely(!g2h_fence)) { + /* Don't tear down channel, as send could've timed out */ + drm_warn(&xe->drm, "G2H fence (%u) not found!\n", fence); + g2h_release_space(ct, GUC_CTB_HXG_MSG_MAX_LEN); + return 0; + } + + XE_WARN_ON(fence != g2h_fence->seqno); + + if (type == GUC_HXG_TYPE_RESPONSE_FAILURE) { + g2h_fence->fail = true; + g2h_fence->error = + FIELD_GET(GUC_HXG_FAILURE_MSG_0_ERROR, msg[0]); + g2h_fence->hint = + FIELD_GET(GUC_HXG_FAILURE_MSG_0_HINT, msg[0]); + } else if (type == GUC_HXG_TYPE_NO_RESPONSE_RETRY) { + g2h_fence->retry = true; + g2h_fence->reason = + FIELD_GET(GUC_HXG_RETRY_MSG_0_REASON, msg[0]); + } else if (g2h_fence->response_buffer) { + g2h_fence->response_len = response_len; + memcpy(g2h_fence->response_buffer, msg + GUC_CTB_MSG_MIN_LEN, + response_len * sizeof(u32)); + } + + g2h_release_space(ct, GUC_CTB_HXG_MSG_MAX_LEN); + + g2h_fence->done = true; + smp_mb(); + + wake_up(&g2h_fence->wq); + + return 0; +} + +static int parse_g2h_msg(struct xe_guc_ct *ct, u32 *msg, u32 len) +{ + struct xe_device *xe = ct_to_xe(ct); + u32 header, hxg, origin, type; + int ret; + + lockdep_assert_held(&ct->lock); + + header = msg[0]; + hxg = msg[1]; + + origin = FIELD_GET(GUC_HXG_MSG_0_ORIGIN, hxg); + if (unlikely(origin != GUC_HXG_ORIGIN_GUC)) { + drm_err(&xe->drm, + "G2H channel broken on read, origin=%d, reset required\n", + origin); + ct->ctbs.g2h.broken = true; + + return -EPROTO; + } + + type = FIELD_GET(GUC_HXG_MSG_0_TYPE, hxg); + switch (type) { + case GUC_HXG_TYPE_EVENT: + ret = parse_g2h_event(ct, msg, len); + break; + case GUC_HXG_TYPE_RESPONSE_SUCCESS: + case GUC_HXG_TYPE_RESPONSE_FAILURE: + case GUC_HXG_TYPE_NO_RESPONSE_RETRY: + ret = parse_g2h_response(ct, msg, len); + break; + default: + drm_err(&xe->drm, + "G2H channel broken on read, type=%d, reset required\n", + type); + ct->ctbs.g2h.broken = true; + + ret = -EOPNOTSUPP; + } + + return ret; +} + +static int process_g2h_msg(struct xe_guc_ct *ct, u32 *msg, u32 len) +{ + struct xe_device *xe = ct_to_xe(ct); + struct xe_guc *guc = ct_to_guc(ct); + u32 action = FIELD_GET(GUC_HXG_EVENT_MSG_0_ACTION, msg[1]); + u32 *payload = msg + GUC_CTB_HXG_MSG_MIN_LEN; + u32 adj_len = len - GUC_CTB_HXG_MSG_MIN_LEN; + int ret = 0; + + if (FIELD_GET(GUC_HXG_MSG_0_TYPE, msg[1]) != GUC_HXG_TYPE_EVENT) + return 0; + + switch (action) { + case XE_GUC_ACTION_SCHED_CONTEXT_MODE_DONE: + ret = xe_guc_sched_done_handler(guc, payload, adj_len); + break; + case XE_GUC_ACTION_DEREGISTER_CONTEXT_DONE: + ret = xe_guc_deregister_done_handler(guc, payload, adj_len); + break; + case XE_GUC_ACTION_CONTEXT_RESET_NOTIFICATION: + ret = xe_guc_engine_reset_handler(guc, payload, adj_len); + break; + case XE_GUC_ACTION_ENGINE_FAILURE_NOTIFICATION: + ret = xe_guc_engine_reset_failure_handler(guc, payload, + adj_len); + break; + case XE_GUC_ACTION_SCHED_ENGINE_MODE_DONE: + /* Selftest only at the moment */ + break; + case XE_GUC_ACTION_STATE_CAPTURE_NOTIFICATION: + case XE_GUC_ACTION_NOTIFY_FLUSH_LOG_BUFFER_TO_FILE: + /* FIXME: Handle this */ + break; + case XE_GUC_ACTION_NOTIFY_MEMORY_CAT_ERROR: + ret = xe_guc_engine_memory_cat_error_handler(guc, payload, + adj_len); + break; + case XE_GUC_ACTION_REPORT_PAGE_FAULT_REQ_DESC: + ret = xe_guc_pagefault_handler(guc, payload, adj_len); + break; + case XE_GUC_ACTION_TLB_INVALIDATION_DONE: + ret = xe_guc_tlb_invalidation_done_handler(guc, payload, + adj_len); + break; + case XE_GUC_ACTION_ACCESS_COUNTER_NOTIFY: + ret = xe_guc_access_counter_notify_handler(guc, payload, + adj_len); + break; + default: + drm_err(&xe->drm, "unexpected action 0x%04x\n", action); + } + + if (ret) + drm_err(&xe->drm, "action 0x%04x failed processing, ret=%d\n", + action, ret); + + return 0; +} + +static int g2h_read(struct xe_guc_ct *ct, u32 *msg, bool fast_path) +{ + struct xe_device *xe = ct_to_xe(ct); + struct guc_ctb *g2h = &ct->ctbs.g2h; + u32 tail, head, len; + s32 avail; + + lockdep_assert_held(&ct->fast_lock); + + if (!ct->enabled) + return -ENODEV; + + if (g2h->broken) + return -EPIPE; + + /* Calculate DW available to read */ + tail = desc_read(xe, g2h, tail); + avail = tail - g2h->head; + if (unlikely(avail == 0)) + return 0; + + if (avail < 0) + avail += g2h->size; + + /* Read header */ + xe_map_memcpy_from(xe, msg, &g2h->cmds, sizeof(u32) * g2h->head, sizeof(u32)); + len = FIELD_GET(GUC_CTB_MSG_0_NUM_DWORDS, msg[0]) + GUC_CTB_MSG_MIN_LEN; + if (len > avail) { + drm_err(&xe->drm, + "G2H channel broken on read, avail=%d, len=%d, reset required\n", + avail, len); + g2h->broken = true; + + return -EPROTO; + } + + head = (g2h->head + 1) % g2h->size; + avail = len - 1; + + /* Read G2H message */ + if (avail + head > g2h->size) { + u32 avail_til_wrap = g2h->size - head; + + xe_map_memcpy_from(xe, msg + 1, + &g2h->cmds, sizeof(u32) * head, + avail_til_wrap * sizeof(u32)); + xe_map_memcpy_from(xe, msg + 1 + avail_til_wrap, + &g2h->cmds, 0, + (avail - avail_til_wrap) * sizeof(u32)); + } else { + xe_map_memcpy_from(xe, msg + 1, + &g2h->cmds, sizeof(u32) * head, + avail * sizeof(u32)); + } + + if (fast_path) { + if (FIELD_GET(GUC_HXG_MSG_0_TYPE, msg[1]) != GUC_HXG_TYPE_EVENT) + return 0; + + switch (FIELD_GET(GUC_HXG_EVENT_MSG_0_ACTION, msg[1])) { + case XE_GUC_ACTION_TLB_INVALIDATION_DONE: + case XE_GUC_ACTION_REPORT_PAGE_FAULT_REQ_DESC: + break; /* Process these in fast-path */ + default: + return 0; + } + } + + /* Update local / descriptor header */ + g2h->head = (head + avail) % g2h->size; + desc_write(xe, g2h, head, g2h->head); + + return len; +} + +static void g2h_fast_path(struct xe_guc_ct *ct, u32 *msg, u32 len) +{ + struct xe_device *xe = ct_to_xe(ct); + struct xe_guc *guc = ct_to_guc(ct); + u32 action = FIELD_GET(GUC_HXG_EVENT_MSG_0_ACTION, msg[1]); + u32 *payload = msg + GUC_CTB_HXG_MSG_MIN_LEN; + u32 adj_len = len - GUC_CTB_HXG_MSG_MIN_LEN; + int ret = 0; + + switch (action) { + case XE_GUC_ACTION_REPORT_PAGE_FAULT_REQ_DESC: + ret = xe_guc_pagefault_handler(guc, payload, adj_len); + break; + case XE_GUC_ACTION_TLB_INVALIDATION_DONE: + __g2h_release_space(ct, len); + ret = xe_guc_tlb_invalidation_done_handler(guc, payload, + adj_len); + break; + default: + XE_WARN_ON("NOT_POSSIBLE"); + } + + if (ret) + drm_err(&xe->drm, "action 0x%04x failed processing, ret=%d\n", + action, ret); +} + +/** + * xe_guc_ct_fast_path - process critical G2H in the IRQ handler + * @ct: GuC CT object + * + * Anything related to page faults is critical for performance, process these + * critical G2H in the IRQ. This is safe as these handlers either just wake up + * waiters or queue another worker. + */ +void xe_guc_ct_fast_path(struct xe_guc_ct *ct) +{ + struct xe_device *xe = ct_to_xe(ct); + int len; + + if (!xe_device_in_fault_mode(xe) || !xe_device_mem_access_ongoing(xe)) + return; + + spin_lock(&ct->fast_lock); + do { + len = g2h_read(ct, ct->fast_msg, true); + if (len > 0) + g2h_fast_path(ct, ct->fast_msg, len); + } while (len > 0); + spin_unlock(&ct->fast_lock); +} + +/* Returns less than zero on error, 0 on done, 1 on more available */ +static int dequeue_one_g2h(struct xe_guc_ct *ct) +{ + int len; + int ret; + + lockdep_assert_held(&ct->lock); + + spin_lock_irq(&ct->fast_lock); + len = g2h_read(ct, ct->msg, false); + spin_unlock_irq(&ct->fast_lock); + if (len <= 0) + return len; + + ret = parse_g2h_msg(ct, ct->msg, len); + if (unlikely(ret < 0)) + return ret; + + ret = process_g2h_msg(ct, ct->msg, len); + if (unlikely(ret < 0)) + return ret; + + return 1; +} + +static void g2h_worker_func(struct work_struct *w) +{ + struct xe_guc_ct *ct = container_of(w, struct xe_guc_ct, g2h_worker); + int ret; + + xe_device_mem_access_get(ct_to_xe(ct)); + do { + mutex_lock(&ct->lock); + ret = dequeue_one_g2h(ct); + mutex_unlock(&ct->lock); + + if (unlikely(ret == -EPROTO || ret == -EOPNOTSUPP)) { + struct drm_device *drm = &ct_to_xe(ct)->drm; + struct drm_printer p = drm_info_printer(drm->dev); + + xe_guc_ct_print(ct, &p); + kick_reset(ct); + } + } while (ret == 1); + xe_device_mem_access_put(ct_to_xe(ct)); +} + +static void guc_ct_ctb_print(struct xe_device *xe, struct guc_ctb *ctb, + struct drm_printer *p) +{ + u32 head, tail; + + drm_printf(p, "\tsize: %d\n", ctb->size); + drm_printf(p, "\tresv_space: %d\n", ctb->resv_space); + drm_printf(p, "\thead: %d\n", ctb->head); + drm_printf(p, "\ttail: %d\n", ctb->tail); + drm_printf(p, "\tspace: %d\n", ctb->space); + drm_printf(p, "\tbroken: %d\n", ctb->broken); + + head = desc_read(xe, ctb, head); + tail = desc_read(xe, ctb, tail); + drm_printf(p, "\thead (memory): %d\n", head); + drm_printf(p, "\ttail (memory): %d\n", tail); + drm_printf(p, "\tstatus (memory): 0x%x\n", desc_read(xe, ctb, status)); + + if (head != tail) { + struct iosys_map map = + IOSYS_MAP_INIT_OFFSET(&ctb->cmds, head * sizeof(u32)); + + while (head != tail) { + drm_printf(p, "\tcmd[%d]: 0x%08x\n", head, + xe_map_rd(xe, &map, 0, u32)); + ++head; + if (head == ctb->size) { + head = 0; + map = ctb->cmds; + } else { + iosys_map_incr(&map, sizeof(u32)); + } + } + } +} + +void xe_guc_ct_print(struct xe_guc_ct *ct, struct drm_printer *p) +{ + if (ct->enabled) { + drm_puts(p, "\nH2G CTB (all sizes in DW):\n"); + guc_ct_ctb_print(ct_to_xe(ct), &ct->ctbs.h2g, p); + + drm_puts(p, "\nG2H CTB (all sizes in DW):\n"); + guc_ct_ctb_print(ct_to_xe(ct), &ct->ctbs.g2h, p); + drm_printf(p, "\tg2h outstanding: %d\n", ct->g2h_outstanding); + } else { + drm_puts(p, "\nCT disabled\n"); + } +} + +#ifdef XE_GUC_CT_SELFTEST +/* + * Disable G2H processing in IRQ handler to force xe_guc_ct_send to enter flow + * control if enough sent, 8k sends is enough. Verify forward process, verify + * credits expected values on exit. + */ +void xe_guc_ct_selftest(struct xe_guc_ct *ct, struct drm_printer *p) +{ + struct guc_ctb *g2h = &ct->ctbs.g2h; + u32 action[] = { XE_GUC_ACTION_SCHED_ENGINE_MODE_SET, 0, 0, 1, }; + u32 bad_action[] = { XE_GUC_ACTION_SCHED_CONTEXT_MODE_SET, 0, 0, }; + int ret; + int i; + + ct->suppress_irq_handler = true; + drm_puts(p, "Starting GuC CT selftest\n"); + + for (i = 0; i < 8192; ++i) { + ret = xe_guc_ct_send(ct, action, ARRAY_SIZE(action), 4, 1); + if (ret) { + drm_printf(p, "Aborted pass %d, ret %d\n", i, ret); + xe_guc_ct_print(ct, p); + break; + } + } + + ct->suppress_irq_handler = false; + if (!ret) { + xe_guc_ct_irq_handler(ct); + msleep(200); + if (g2h->space != + CIRC_SPACE(0, 0, g2h->size) - g2h->resv_space) { + drm_printf(p, "Mismatch on space %d, %d\n", + g2h->space, + CIRC_SPACE(0, 0, g2h->size) - + g2h->resv_space); + ret = -EIO; + } + if (ct->g2h_outstanding) { + drm_printf(p, "Outstanding G2H, %d\n", + ct->g2h_outstanding); + ret = -EIO; + } + } + + /* Check failure path for blocking CTs too */ + xe_guc_ct_send_block(ct, bad_action, ARRAY_SIZE(bad_action)); + if (g2h->space != + CIRC_SPACE(0, 0, g2h->size) - g2h->resv_space) { + drm_printf(p, "Mismatch on space %d, %d\n", + g2h->space, + CIRC_SPACE(0, 0, g2h->size) - + g2h->resv_space); + ret = -EIO; + } + if (ct->g2h_outstanding) { + drm_printf(p, "Outstanding G2H, %d\n", + ct->g2h_outstanding); + ret = -EIO; + } + + drm_printf(p, "GuC CT selftest done - %s\n", ret ? "FAIL" : "PASS"); +} +#endif |