diff options
Diffstat (limited to 'drivers/gpu/drm/xe/xe_gt_topology.c')
| -rw-r--r-- | drivers/gpu/drm/xe/xe_gt_topology.c | 169 |
1 files changed, 169 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 000000000..a8d7f272c --- /dev/null +++ b/drivers/gpu/drm/xe/xe_gt_topology.c @@ -0,0 +1,169 @@ +// SPDX-License-Identifier: MIT +/* + * Copyright © 2022 Intel Corporation + */ + +#include "xe_gt_topology.h" + +#include <linux/bitmap.h> + +#include "regs/xe_gt_regs.h" +#include "xe_gt.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) + +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, struct xe_reg)); + 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_val = 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_val = ~reg_val & XELP_EU_MASK; + + /* On PVC, one bit = one EU */ + if (GRAPHICS_VERx100(xe) == 1260) { + val = reg_val; + } else { + /* All other platforms, one bit = 2 EU */ + for (i = 0; i < fls(reg_val); i++) + if (reg_val & BIT(i)) + val |= 0x3 << 2 * i; + } + + bitmap_from_arr32(mask, &val, XE_MAX_EU_FUSE_BITS); +} + +static void +get_num_dss_regs(struct xe_device *xe, int *geometry_regs, int *compute_regs) +{ + if (GRAPHICS_VER(xe) > 20) { + *geometry_regs = 3; + *compute_regs = 3; + } else if (GRAPHICS_VERx100(xe) == 1260) { + *geometry_regs = 0; + *compute_regs = 2; + } else if (GRAPHICS_VERx100(xe) >= 1250) { + *geometry_regs = 1; + *compute_regs = 1; + } else { + *geometry_regs = 1; + *compute_regs = 0; + } +} + +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; + + get_num_dss_regs(xe, &num_geometry_regs, &num_compute_regs); + + /* + * Register counts returned shouldn't exceed the number of registers + * passed as parameters below. + */ + drm_WARN_ON(&xe->drm, num_geometry_regs > 3); + drm_WARN_ON(&xe->drm, num_compute_regs > 3); + + load_dss_mask(gt, gt->fuse_topo.g_dss_mask, + num_geometry_regs, + XELP_GT_GEOMETRY_DSS_ENABLE, + XE2_GT_GEOMETRY_DSS_1, + XE2_GT_GEOMETRY_DSS_2); + load_dss_mask(gt, gt->fuse_topo.c_dss_mask, num_compute_regs, + XEHP_GT_COMPUTE_DSS_ENABLE, + XEHPC_GT_COMPUTE_DSS_ENABLE_EXT, + XE2_GT_COMPUTE_DSS_2); + load_eu_mask(gt, gt->fuse_topo.eu_mask_per_dss); + + xe_gt_topology_dump(gt, &p); +} + +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(const xe_dss_mask_t mask, int groupsize, int groupnum) +{ + return find_next_bit(mask, XE_MAX_DSS_FUSE_BITS, groupnum * groupsize); +} + +bool xe_dss_mask_empty(const xe_dss_mask_t mask) +{ + return bitmap_empty(mask, XE_MAX_DSS_FUSE_BITS); +} + +/** + * xe_gt_topology_has_dss_in_quadrant - check fusing of DSS in GT quadrant + * @gt: GT to check + * @quad: Which quadrant of the DSS space to check + * + * Since Xe_HP platforms can have up to four CCS engines, those engines + * are each logically associated with a quarter of the possible DSS. If there + * are no DSS present in one of the four quadrants of the DSS space, the + * corresponding CCS engine is also not available for use. + * + * Returns false if all DSS in a quadrant of the GT are fused off, else true. + */ +bool xe_gt_topology_has_dss_in_quadrant(struct xe_gt *gt, int quad) +{ + struct xe_device *xe = gt_to_xe(gt); + xe_dss_mask_t all_dss; + int g_dss_regs, c_dss_regs, dss_per_quad, quad_first; + + bitmap_or(all_dss, gt->fuse_topo.g_dss_mask, gt->fuse_topo.c_dss_mask, + XE_MAX_DSS_FUSE_BITS); + + get_num_dss_regs(xe, &g_dss_regs, &c_dss_regs); + dss_per_quad = 32 * max(g_dss_regs, c_dss_regs) / 4; + + quad_first = xe_dss_mask_group_ffs(all_dss, dss_per_quad, quad); + + return quad_first < (quad + 1) * dss_per_quad; +} |