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drm/xe/migrate: Add function to copy of VRAM data in chunks

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Introduce a new function to copy data between VRAM and sysmem objects.
The existing xe_migrate_copy() is tailored for eviction and restore
operations, which involves additional logic and operates on entire
objects.
The xe_migrate_vram_copy_chunk() allows copying chunks of data to or
from a dedicated buffer object, which is essential in case of VF
migration.

Signed-off-by: Lukasz Laguna <lukasz.laguna@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Link: https://patch.msgid.link/20251112132220.516975-22-michal.winiarski@intel.com
Signed-off-by: Michał Winiarski <michal.winiarski@intel.com>
This commit is contained in:
Lukasz Laguna 2025-11-12 14:22:17 +01:00 committed by Michał Winiarski
parent 274186fab3
commit 57a5f45b3b
2 changed files with 131 additions and 5 deletions
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128
drivers/gpu/drm/xe/xe_migrate.c
View File

@ -29,6 +29,7 @@
#include "xe_lrc.h"
#include "xe_map.h"
#include "xe_mocs.h"
#include "xe_printk.h"
#include "xe_pt.h"
#include "xe_res_cursor.h"
#include "xe_sa.h"
@ -1210,6 +1211,128 @@ struct xe_exec_queue *xe_migrate_exec_queue(struct xe_migrate *migrate)
return migrate->q;
}
/**
* xe_migrate_vram_copy_chunk() - Copy a chunk of a VRAM buffer object.
* @vram_bo: The VRAM buffer object.
* @vram_offset: The VRAM offset.
* @sysmem_bo: The sysmem buffer object.
* @sysmem_offset: The sysmem offset.
* @size: The size of VRAM chunk to copy.
* @dir: The direction of the copy operation.
*
* Copies a portion of a buffer object between VRAM and system memory.
* On Xe2 platforms that support flat CCS, VRAM data is decompressed when
* copying to system memory.
*
* Return: Pointer to a dma_fence representing the last copy batch, or
* an error pointer on failure. If there is a failure, any copy operation
* started by the function call has been synced.
*/
struct dma_fence *xe_migrate_vram_copy_chunk(struct xe_bo *vram_bo, u64 vram_offset,
struct xe_bo *sysmem_bo, u64 sysmem_offset,
u64 size, enum xe_migrate_copy_dir dir)
{
struct xe_device *xe = xe_bo_device(vram_bo);
struct xe_tile *tile = vram_bo->tile;
struct xe_gt *gt = tile->primary_gt;
struct xe_migrate *m = tile->migrate;
struct dma_fence *fence = NULL;
struct ttm_resource *vram = vram_bo->ttm.resource;
struct ttm_resource *sysmem = sysmem_bo->ttm.resource;
struct xe_res_cursor vram_it, sysmem_it;
u64 vram_L0_ofs, sysmem_L0_ofs;
u32 vram_L0_pt, sysmem_L0_pt;
u64 vram_L0, sysmem_L0;
bool to_sysmem = (dir == XE_MIGRATE_COPY_TO_SRAM);
bool use_comp_pat = to_sysmem &&
GRAPHICS_VER(xe) >= 20 && xe_device_has_flat_ccs(xe);
int pass = 0;
int err;
xe_assert(xe, IS_ALIGNED(vram_offset | sysmem_offset | size, PAGE_SIZE));
xe_assert(xe, xe_bo_is_vram(vram_bo));
xe_assert(xe, !xe_bo_is_vram(sysmem_bo));
xe_assert(xe, !range_overflows(vram_offset, size, (u64)vram_bo->ttm.base.size));
xe_assert(xe, !range_overflows(sysmem_offset, size, (u64)sysmem_bo->ttm.base.size));
xe_res_first(vram, vram_offset, size, &vram_it);
xe_res_first_sg(xe_bo_sg(sysmem_bo), sysmem_offset, size, &sysmem_it);
while (size) {
u32 pte_flags = PTE_UPDATE_FLAG_IS_VRAM;
u32 batch_size = 2; /* arb_clear() + MI_BATCH_BUFFER_END */
struct xe_sched_job *job;
struct xe_bb *bb;
u32 update_idx;
bool usm = xe->info.has_usm;
u32 avail_pts = max_mem_transfer_per_pass(xe) / LEVEL0_PAGE_TABLE_ENCODE_SIZE;
sysmem_L0 = xe_migrate_res_sizes(m, &sysmem_it);
vram_L0 = min(xe_migrate_res_sizes(m, &vram_it), sysmem_L0);
xe_dbg(xe, "Pass %u, size: %llu\n", pass++, vram_L0);
pte_flags |= use_comp_pat ? PTE_UPDATE_FLAG_IS_COMP_PTE : 0;
batch_size += pte_update_size(m, pte_flags, vram, &vram_it, &vram_L0,
&vram_L0_ofs, &vram_L0_pt, 0, 0, avail_pts);
batch_size += pte_update_size(m, 0, sysmem, &sysmem_it, &vram_L0, &sysmem_L0_ofs,
&sysmem_L0_pt, 0, avail_pts, avail_pts);
batch_size += EMIT_COPY_DW;
bb = xe_bb_new(gt, batch_size, usm);
if (IS_ERR(bb)) {
err = PTR_ERR(bb);
return ERR_PTR(err);
}
if (xe_migrate_allow_identity(vram_L0, &vram_it))
xe_res_next(&vram_it, vram_L0);
else
emit_pte(m, bb, vram_L0_pt, true, use_comp_pat, &vram_it, vram_L0, vram);
emit_pte(m, bb, sysmem_L0_pt, false, false, &sysmem_it, vram_L0, sysmem);
bb->cs[bb->len++] = MI_BATCH_BUFFER_END;
update_idx = bb->len;
if (to_sysmem)
emit_copy(gt, bb, vram_L0_ofs, sysmem_L0_ofs, vram_L0, XE_PAGE_SIZE);
else
emit_copy(gt, bb, sysmem_L0_ofs, vram_L0_ofs, vram_L0, XE_PAGE_SIZE);
job = xe_bb_create_migration_job(m->q, bb, xe_migrate_batch_base(m, usm),
update_idx);
if (IS_ERR(job)) {
xe_bb_free(bb, NULL);
err = PTR_ERR(job);
return ERR_PTR(err);
}
xe_sched_job_add_migrate_flush(job, MI_INVALIDATE_TLB);
xe_assert(xe, dma_resv_test_signaled(vram_bo->ttm.base.resv,
DMA_RESV_USAGE_BOOKKEEP));
xe_assert(xe, dma_resv_test_signaled(sysmem_bo->ttm.base.resv,
DMA_RESV_USAGE_BOOKKEEP));
scoped_guard(mutex, &m->job_mutex) {
xe_sched_job_arm(job);
dma_fence_put(fence);
fence = dma_fence_get(&job->drm.s_fence->finished);
xe_sched_job_push(job);
dma_fence_put(m->fence);
m->fence = dma_fence_get(fence);
}
xe_bb_free(bb, fence);
size -= vram_L0;
}
return fence;
}
static void emit_clear_link_copy(struct xe_gt *gt, struct xe_bb *bb, u64 src_ofs,
u32 size, u32 pitch)
{
@ -1912,11 +2035,6 @@ static bool xe_migrate_vram_use_pde(struct drm_pagemap_addr *sram_addr,
return true;
}
enum xe_migrate_copy_dir {
XE_MIGRATE_COPY_TO_VRAM,
XE_MIGRATE_COPY_TO_SRAM,
};
#define XE_CACHELINE_BYTES 64ull
#define XE_CACHELINE_MASK (XE_CACHELINE_BYTES - 1)

8
drivers/gpu/drm/xe/xe_migrate.h
View File

@ -28,6 +28,11 @@ struct xe_vma;
enum xe_sriov_vf_ccs_rw_ctxs;
enum xe_migrate_copy_dir {
XE_MIGRATE_COPY_TO_VRAM,
XE_MIGRATE_COPY_TO_SRAM,
};
/**
* struct xe_migrate_pt_update_ops - Callbacks for the
* xe_migrate_update_pgtables() function.
@ -131,6 +136,9 @@ int xe_migrate_ccs_rw_copy(struct xe_tile *tile, struct xe_exec_queue *q,
struct xe_lrc *xe_migrate_lrc(struct xe_migrate *migrate);
struct xe_exec_queue *xe_migrate_exec_queue(struct xe_migrate *migrate);
struct dma_fence *xe_migrate_vram_copy_chunk(struct xe_bo *vram_bo, u64 vram_offset,
struct xe_bo *sysmem_bo, u64 sysmem_offset,
u64 size, enum xe_migrate_copy_dir dir);
int xe_migrate_access_memory(struct xe_migrate *m, struct xe_bo *bo,
unsigned long offset, void *buf, int len,
int write);