In an upcoming change, the VF MMIO migration data will be handled as part of VF control state machine. Add the necessary helpers to allow the migration data transfer to/from the VF MMIO registers.
Signed-off-by: Michał Winiarski <[email protected]> --- drivers/gpu/drm/xe/xe_gt_sriov_pf.c | 88 +++++++++++++++++++++++++++++ drivers/gpu/drm/xe/xe_gt_sriov_pf.h | 19 +++++++ 2 files changed, 107 insertions(+) diff --git a/drivers/gpu/drm/xe/xe_gt_sriov_pf.c b/drivers/gpu/drm/xe/xe_gt_sriov_pf.c index c4dda87b47cc8..6ceb9e024e41e 100644 --- a/drivers/gpu/drm/xe/xe_gt_sriov_pf.c +++ b/drivers/gpu/drm/xe/xe_gt_sriov_pf.c @@ -194,6 +194,94 @@ static void pf_clear_vf_scratch_regs(struct xe_gt *gt, unsigned int vfid) } } +/** + * xe_gt_sriov_pf_mmio_vf_size - Get the size of VF MMIO register data. + * @gt: the &struct xe_gt + * @vfid: VF identifier + * + * Return: size in bytes. + */ +size_t xe_gt_sriov_pf_mmio_vf_size(struct xe_gt *gt, unsigned int vfid) +{ + if (xe_gt_is_media_type(gt)) + return MED_VF_SW_FLAG_COUNT * sizeof(u32); + else + return VF_SW_FLAG_COUNT * sizeof(u32); +} + +/** + * xe_gt_sriov_pf_mmio_vf_save - Save VF MMIO register values to a buffer. + * @gt: the &struct xe_gt + * @vfid: VF identifier + * @buf: destination buffer + * @size: destination buffer size in bytes + * + * Return: 0 on success or a negative error code on failure. + */ +int xe_gt_sriov_pf_mmio_vf_save(struct xe_gt *gt, unsigned int vfid, void *buf, size_t size) +{ + u32 stride = pf_get_vf_regs_stride(gt_to_xe(gt)); + struct xe_reg scratch; + u32 *regs = buf; + int n, count; + + if (size != xe_gt_sriov_pf_mmio_vf_size(gt, vfid)) + return -EINVAL; + + if (xe_gt_is_media_type(gt)) { + count = MED_VF_SW_FLAG_COUNT; + for (n = 0; n < count; n++) { + scratch = xe_reg_vf_to_pf(MED_VF_SW_FLAG(n), vfid, stride); + regs[n] = xe_mmio_read32(>->mmio, scratch); + } + } else { + count = VF_SW_FLAG_COUNT; + for (n = 0; n < count; n++) { + scratch = xe_reg_vf_to_pf(VF_SW_FLAG(n), vfid, stride); + regs[n] = xe_mmio_read32(>->mmio, scratch); + } + } + + return 0; +} + +/** + * xe_gt_sriov_pf_mmio_vf_restore - Restore VF MMIO register values from a buffer. + * @gt: the &struct xe_gt + * @vfid: VF identifier + * @buf: source buffer + * @size: source buffer size in bytes + * + * Return: 0 on success or a negative error code on failure. + */ +int xe_gt_sriov_pf_mmio_vf_restore(struct xe_gt *gt, unsigned int vfid, + const void *buf, size_t size) +{ + u32 stride = pf_get_vf_regs_stride(gt_to_xe(gt)); + const u32 *regs = buf; + struct xe_reg scratch; + int n, count; + + if (size != xe_gt_sriov_pf_mmio_vf_size(gt, vfid)) + return -EINVAL; + + if (xe_gt_is_media_type(gt)) { + count = MED_VF_SW_FLAG_COUNT; + for (n = 0; n < count; n++) { + scratch = xe_reg_vf_to_pf(MED_VF_SW_FLAG(n), vfid, stride); + xe_mmio_write32(>->mmio, scratch, regs[n]); + } + } else { + count = VF_SW_FLAG_COUNT; + for (n = 0; n < count; n++) { + scratch = xe_reg_vf_to_pf(VF_SW_FLAG(n), vfid, stride); + xe_mmio_write32(>->mmio, scratch, regs[n]); + } + } + + return 0; +} + /** * xe_gt_sriov_pf_sanitize_hw() - Reset hardware state related to a VF. * @gt: the &xe_gt diff --git a/drivers/gpu/drm/xe/xe_gt_sriov_pf.h b/drivers/gpu/drm/xe/xe_gt_sriov_pf.h index e7fde3f9937af..5e5f31d943d89 100644 --- a/drivers/gpu/drm/xe/xe_gt_sriov_pf.h +++ b/drivers/gpu/drm/xe/xe_gt_sriov_pf.h @@ -6,6 +6,8 @@ #ifndef _XE_GT_SRIOV_PF_H_ #define _XE_GT_SRIOV_PF_H_ +#include <linux/types.h> + struct xe_gt; #ifdef CONFIG_PCI_IOV @@ -16,6 +18,10 @@ void xe_gt_sriov_pf_init_hw(struct xe_gt *gt); void xe_gt_sriov_pf_sanitize_hw(struct xe_gt *gt, unsigned int vfid); void xe_gt_sriov_pf_stop_prepare(struct xe_gt *gt); void xe_gt_sriov_pf_restart(struct xe_gt *gt); +size_t xe_gt_sriov_pf_mmio_vf_size(struct xe_gt *gt, unsigned int vfid); +int xe_gt_sriov_pf_mmio_vf_save(struct xe_gt *gt, unsigned int vfid, void *buf, size_t size); +int xe_gt_sriov_pf_mmio_vf_restore(struct xe_gt *gt, unsigned int vfid, + const void *buf, size_t size); #else static inline int xe_gt_sriov_pf_init_early(struct xe_gt *gt) { @@ -38,6 +44,19 @@ static inline void xe_gt_sriov_pf_stop_prepare(struct xe_gt *gt) static inline void xe_gt_sriov_pf_restart(struct xe_gt *gt) { } +size_t xe_gt_sriov_pf_mmio_vf_size(struct xe_gt *gt, unsigned int vfid) +{ + return 0; +} +int xe_gt_sriov_pf_mmio_vf_save(struct xe_gt *gt, unsigned int vfid, void *buf, size_t size) +{ + return -ENODEV; +} +int xe_gt_sriov_pf_mmio_vf_restore(struct xe_gt *gt, unsigned int vfid, + const void *buf, size_t size) +{ + return -ENODEV; +} #endif #endif -- 2.50.1
