diff options
Diffstat (limited to 'drivers/gpu/drm/xe/xe_gt_topology.c')
| -rw-r--r-- | drivers/gpu/drm/xe/xe_gt_topology.c | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/drivers/gpu/drm/xe/xe_gt_topology.c b/drivers/gpu/drm/xe/xe_gt_topology.c new file mode 100644 index 000000000000..8e02e362ba27 --- /dev/null +++ b/drivers/gpu/drm/xe/xe_gt_topology.c @@ -0,0 +1,144 @@ +// SPDX-License-Identifier: MIT +/* + * Copyright © 2022 Intel Corporation + */ + +#include <linux/bitmap.h> + +#include "xe_gt.h" +#include "xe_gt_topology.h" +#include "xe_mmio.h" + +#define XE_MAX_DSS_FUSE_BITS (32 * XE_MAX_DSS_FUSE_REGS) +#define XE_MAX_EU_FUSE_BITS (32 * XE_MAX_EU_FUSE_REGS) + +#define XELP_EU_ENABLE 0x9134 /* "_DISABLE" on Xe_LP */ +#define XELP_EU_MASK REG_GENMASK(7, 0) +#define XELP_GT_GEOMETRY_DSS_ENABLE 0x913c +#define XEHP_GT_COMPUTE_DSS_ENABLE 0x9144 +#define XEHPC_GT_COMPUTE_DSS_ENABLE_EXT 0x9148 + +static void +load_dss_mask(struct xe_gt *gt, xe_dss_mask_t mask, int numregs, ...) +{ + va_list argp; + u32 fuse_val[XE_MAX_DSS_FUSE_REGS] = {}; + int i; + + if (drm_WARN_ON(>_to_xe(gt)->drm, numregs > XE_MAX_DSS_FUSE_REGS)) + numregs = XE_MAX_DSS_FUSE_REGS; + + va_start(argp, numregs); + for (i = 0; i < numregs; i++) + fuse_val[i] = xe_mmio_read32(gt, va_arg(argp, u32)); + va_end(argp); + + bitmap_from_arr32(mask, fuse_val, numregs * 32); +} + +static void +load_eu_mask(struct xe_gt *gt, xe_eu_mask_t mask) +{ + struct xe_device *xe = gt_to_xe(gt); + u32 reg = xe_mmio_read32(gt, XELP_EU_ENABLE); + u32 val = 0; + int i; + + BUILD_BUG_ON(XE_MAX_EU_FUSE_REGS > 1); + + /* + * Pre-Xe_HP platforms inverted the bit meaning (disable instead + * of enable). + */ + if (GRAPHICS_VERx100(xe) < 1250) + reg = ~reg & XELP_EU_MASK; + + /* On PVC, one bit = one EU */ + if (GRAPHICS_VERx100(xe) == 1260) { + val = reg; + } else { + /* All other platforms, one bit = 2 EU */ + for (i = 0; i < fls(reg); i++) + if (reg & BIT(i)) + val |= 0x3 << 2 * i; + } + + bitmap_from_arr32(mask, &val, XE_MAX_EU_FUSE_BITS); +} + +void +xe_gt_topology_init(struct xe_gt *gt) +{ + struct xe_device *xe = gt_to_xe(gt); + struct drm_printer p = drm_debug_printer("GT topology"); + int num_geometry_regs, num_compute_regs; + + if (GRAPHICS_VERx100(xe) == 1260) { + num_geometry_regs = 0; + num_compute_regs = 2; + } else if (GRAPHICS_VERx100(xe) >= 1250) { + num_geometry_regs = 1; + num_compute_regs = 1; + } else { + num_geometry_regs = 1; + num_compute_regs = 0; + } + + load_dss_mask(gt, gt->fuse_topo.g_dss_mask, num_geometry_regs, + XELP_GT_GEOMETRY_DSS_ENABLE); + load_dss_mask(gt, gt->fuse_topo.c_dss_mask, num_compute_regs, + XEHP_GT_COMPUTE_DSS_ENABLE, + XEHPC_GT_COMPUTE_DSS_ENABLE_EXT); + load_eu_mask(gt, gt->fuse_topo.eu_mask_per_dss); + + xe_gt_topology_dump(gt, &p); +} + +unsigned int +xe_gt_topology_count_dss(xe_dss_mask_t mask) +{ + return bitmap_weight(mask, XE_MAX_DSS_FUSE_BITS); +} + +u64 +xe_gt_topology_dss_group_mask(xe_dss_mask_t mask, int grpsize) +{ + xe_dss_mask_t per_dss_mask = {}; + u64 grpmask = 0; + + WARN_ON(DIV_ROUND_UP(XE_MAX_DSS_FUSE_BITS, grpsize) > BITS_PER_TYPE(grpmask)); + + bitmap_fill(per_dss_mask, grpsize); + for (int i = 0; !bitmap_empty(mask, XE_MAX_DSS_FUSE_BITS); i++) { + if (bitmap_intersects(mask, per_dss_mask, grpsize)) + grpmask |= BIT(i); + + bitmap_shift_right(mask, mask, grpsize, XE_MAX_DSS_FUSE_BITS); + } + + return grpmask; +} + +void +xe_gt_topology_dump(struct xe_gt *gt, struct drm_printer *p) +{ + drm_printf(p, "dss mask (geometry): %*pb\n", XE_MAX_DSS_FUSE_BITS, + gt->fuse_topo.g_dss_mask); + drm_printf(p, "dss mask (compute): %*pb\n", XE_MAX_DSS_FUSE_BITS, + gt->fuse_topo.c_dss_mask); + + drm_printf(p, "EU mask per DSS: %*pb\n", XE_MAX_EU_FUSE_BITS, + gt->fuse_topo.eu_mask_per_dss); + +} + +/* + * Used to obtain the index of the first DSS. Can start searching from the + * beginning of a specific dss group (e.g., gslice, cslice, etc.) if + * groupsize and groupnum are non-zero. + */ +unsigned int +xe_dss_mask_group_ffs(xe_dss_mask_t mask, int groupsize, int groupnum) +{ + return find_next_bit(mask, XE_MAX_DSS_FUSE_BITS, groupnum * groupsize); +} |