diff options
Diffstat (limited to 'drivers/gpu/drm/xe/xe_tile_sriov_vf.c')
| -rw-r--r-- | drivers/gpu/drm/xe/xe_tile_sriov_vf.c | 254 |
1 files changed, 254 insertions, 0 deletions
diff --git a/drivers/gpu/drm/xe/xe_tile_sriov_vf.c b/drivers/gpu/drm/xe/xe_tile_sriov_vf.c new file mode 100644 index 000000000000..f221dbed16f0 --- /dev/null +++ b/drivers/gpu/drm/xe/xe_tile_sriov_vf.c @@ -0,0 +1,254 @@ +// SPDX-License-Identifier: MIT +/* + * Copyright © 2025 Intel Corporation + */ + +#include <drm/drm_managed.h> + +#include "regs/xe_gtt_defs.h" + +#include "xe_assert.h" +#include "xe_ggtt.h" +#include "xe_gt_sriov_vf.h" +#include "xe_sriov.h" +#include "xe_sriov_printk.h" +#include "xe_tile_sriov_vf.h" +#include "xe_wopcm.h" + +static int vf_init_ggtt_balloons(struct xe_tile *tile) +{ + struct xe_ggtt *ggtt = tile->mem.ggtt; + + xe_tile_assert(tile, IS_SRIOV_VF(tile_to_xe(tile))); + + tile->sriov.vf.ggtt_balloon[0] = xe_ggtt_node_init(ggtt); + if (IS_ERR(tile->sriov.vf.ggtt_balloon[0])) + return PTR_ERR(tile->sriov.vf.ggtt_balloon[0]); + + tile->sriov.vf.ggtt_balloon[1] = xe_ggtt_node_init(ggtt); + if (IS_ERR(tile->sriov.vf.ggtt_balloon[1])) { + xe_ggtt_node_fini(tile->sriov.vf.ggtt_balloon[0]); + return PTR_ERR(tile->sriov.vf.ggtt_balloon[1]); + } + + return 0; +} + +/** + * xe_tile_sriov_vf_balloon_ggtt_locked - Insert balloon nodes to limit used GGTT address range. + * @tile: the &xe_tile struct instance + * + * Return: 0 on success or a negative error code on failure. + */ +int xe_tile_sriov_vf_balloon_ggtt_locked(struct xe_tile *tile) +{ + u64 ggtt_base = xe_gt_sriov_vf_ggtt_base(tile->primary_gt); + u64 ggtt_size = xe_gt_sriov_vf_ggtt(tile->primary_gt); + struct xe_device *xe = tile_to_xe(tile); + u64 wopcm = xe_wopcm_size(xe); + u64 start, end; + int err; + + xe_tile_assert(tile, IS_SRIOV_VF(xe)); + xe_tile_assert(tile, ggtt_size); + lockdep_assert_held(&tile->mem.ggtt->lock); + + /* + * VF can only use part of the GGTT as allocated by the PF: + * + * WOPCM GUC_GGTT_TOP + * |<------------ Total GGTT size ------------------>| + * + * VF GGTT base -->|<- size ->| + * + * +--------------------+----------+-----------------+ + * |////////////////////| block |\\\\\\\\\\\\\\\\\| + * +--------------------+----------+-----------------+ + * + * |<--- balloon[0] --->|<-- VF -->|<-- balloon[1] ->| + */ + + if (ggtt_base < wopcm || ggtt_base > GUC_GGTT_TOP || + ggtt_size > GUC_GGTT_TOP - ggtt_base) { + xe_sriov_err(xe, "tile%u: Invalid GGTT configuration: %#llx-%#llx\n", + tile->id, ggtt_base, ggtt_base + ggtt_size - 1); + return -ERANGE; + } + + start = wopcm; + end = ggtt_base; + if (end != start) { + err = xe_ggtt_node_insert_balloon_locked(tile->sriov.vf.ggtt_balloon[0], + start, end); + if (err) + return err; + } + + start = ggtt_base + ggtt_size; + end = GUC_GGTT_TOP; + if (end != start) { + err = xe_ggtt_node_insert_balloon_locked(tile->sriov.vf.ggtt_balloon[1], + start, end); + if (err) { + xe_ggtt_node_remove_balloon_locked(tile->sriov.vf.ggtt_balloon[0]); + return err; + } + } + + return 0; +} + +static int vf_balloon_ggtt(struct xe_tile *tile) +{ + struct xe_ggtt *ggtt = tile->mem.ggtt; + int err; + + mutex_lock(&ggtt->lock); + err = xe_tile_sriov_vf_balloon_ggtt_locked(tile); + mutex_unlock(&ggtt->lock); + + return err; +} + +/** + * xe_tile_sriov_vf_deballoon_ggtt_locked - Remove balloon nodes. + * @tile: the &xe_tile struct instance + */ +void xe_tile_sriov_vf_deballoon_ggtt_locked(struct xe_tile *tile) +{ + xe_tile_assert(tile, IS_SRIOV_VF(tile_to_xe(tile))); + + xe_ggtt_node_remove_balloon_locked(tile->sriov.vf.ggtt_balloon[1]); + xe_ggtt_node_remove_balloon_locked(tile->sriov.vf.ggtt_balloon[0]); +} + +static void vf_deballoon_ggtt(struct xe_tile *tile) +{ + mutex_lock(&tile->mem.ggtt->lock); + xe_tile_sriov_vf_deballoon_ggtt_locked(tile); + mutex_unlock(&tile->mem.ggtt->lock); +} + +static void vf_fini_ggtt_balloons(struct xe_tile *tile) +{ + xe_tile_assert(tile, IS_SRIOV_VF(tile_to_xe(tile))); + + xe_ggtt_node_fini(tile->sriov.vf.ggtt_balloon[1]); + xe_ggtt_node_fini(tile->sriov.vf.ggtt_balloon[0]); +} + +static void cleanup_ggtt(struct drm_device *drm, void *arg) +{ + struct xe_tile *tile = arg; + + vf_deballoon_ggtt(tile); + vf_fini_ggtt_balloons(tile); +} + +/** + * xe_tile_sriov_vf_prepare_ggtt - Prepare a VF's GGTT configuration. + * @tile: the &xe_tile + * + * This function is for VF use only. + * + * Return: 0 on success or a negative error code on failure. + */ +int xe_tile_sriov_vf_prepare_ggtt(struct xe_tile *tile) +{ + struct xe_device *xe = tile_to_xe(tile); + int err; + + err = vf_init_ggtt_balloons(tile); + if (err) + return err; + + err = vf_balloon_ggtt(tile); + if (err) { + vf_fini_ggtt_balloons(tile); + return err; + } + + return drmm_add_action_or_reset(&xe->drm, cleanup_ggtt, tile); +} + +/** + * DOC: GGTT nodes shifting during VF post-migration recovery + * + * The first fixup applied to the VF KMD structures as part of post-migration + * recovery is shifting nodes within &xe_ggtt instance. The nodes are moved + * from range previously assigned to this VF, into newly provisioned area. + * The changes include balloons, which are resized accordingly. + * + * The balloon nodes are there to eliminate unavailable ranges from use: one + * reserves the GGTT area below the range for current VF, and another one + * reserves area above. + * + * Below is a GGTT layout of example VF, with a certain address range assigned to + * said VF, and inaccessible areas above and below: + * + * 0 4GiB + * |<--------------------------- Total GGTT size ----------------------------->| + * WOPCM GUC_TOP + * |<-------------- Area mappable by xe_ggtt instance ---------------->| + * + * +---+---------------------------------+----------+----------------------+---+ + * |\\\|/////////////////////////////////| VF mem |//////////////////////|\\\| + * +---+---------------------------------+----------+----------------------+---+ + * + * Hardware enforced access rules before migration: + * + * |<------- inaccessible for VF ------->|<VF owned>|<-- inaccessible for VF ->| + * + * GGTT nodes used for tracking allocations: + * + * |<---------- balloon ------------>|<- nodes->|<----- balloon ------>| + * + * After the migration, GGTT area assigned to the VF might have shifted, either + * to lower or to higher address. But we expect the total size and extra areas to + * be identical, as migration can only happen between matching platforms. + * Below is an example of GGTT layout of the VF after migration. Content of the + * GGTT for VF has been moved to a new area, and we receive its address from GuC: + * + * +---+----------------------+----------+---------------------------------+---+ + * |\\\|//////////////////////| VF mem |/////////////////////////////////|\\\| + * +---+----------------------+----------+---------------------------------+---+ + * + * Hardware enforced access rules after migration: + * + * |<- inaccessible for VF -->|<VF owned>|<------- inaccessible for VF ------->| + * + * So the VF has a new slice of GGTT assigned, and during migration process, the + * memory content was copied to that new area. But the &xe_ggtt nodes are still + * tracking allocations using the old addresses. The nodes within VF owned area + * have to be shifted, and balloon nodes need to be resized to properly mask out + * areas not owned by the VF. + * + * Fixed &xe_ggtt nodes used for tracking allocations: + * + * |<------ balloon ------>|<- nodes->|<----------- balloon ----------->| + * + * Due to use of GPU profiles, we do not expect the old and new GGTT ares to + * overlap; but our node shifting will fix addresses properly regardless. + */ + +/** + * xe_tile_sriov_vf_fixup_ggtt_nodes - Shift GGTT allocations to match assigned range. + * @tile: the &xe_tile struct instance + * @shift: the shift value + * + * Since Global GTT is not virtualized, each VF has an assigned range + * within the global space. This range might have changed during migration, + * which requires all memory addresses pointing to GGTT to be shifted. + */ +void xe_tile_sriov_vf_fixup_ggtt_nodes(struct xe_tile *tile, s64 shift) +{ + struct xe_ggtt *ggtt = tile->mem.ggtt; + + mutex_lock(&ggtt->lock); + + xe_tile_sriov_vf_deballoon_ggtt_locked(tile); + xe_ggtt_shift_nodes_locked(ggtt, shift); + xe_tile_sriov_vf_balloon_ggtt_locked(tile); + + mutex_unlock(&ggtt->lock); +} |