On 17/05/2022 16:15, Matt Roper wrote:
As with EU masks, it's easier to store subslice/DSS masks internally in
a format that's more natural for the driver to work with, and then only
covert into the u8[] uapi form when the query ioctl is invoked. Since
the hardware design changed significantly with Xe_HP, we'll use a union
to choose between the old "hsw-style" subslice masks or the newer xehp
mask. HSW-style masks will be stored in an array of u8's, indexed by
slice (there's never more than 6 subslices per slice on older
platforms). For Xe_HP and beyond where slices no longer exist, we only
need a single bitmask. However we already know that this mask is
eventually going to grow too large for a simple u64 to hold, so we'll
represent it in a manner that can be operated on by the utilities in
linux/bitmap.h.
v3:
- Fix typo: BIT(s) -> BIT(ss) in gen9_sseu_device_status()
Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxxxxxxxx>
Signed-off-by: Matt Roper <matthew.d.roper@xxxxxxxxx>
---
drivers/gpu/drm/i915/gem/i915_gem_context.c | 5 +-
drivers/gpu/drm/i915/gt/intel_engine_cs.c | 4 +-
drivers/gpu/drm/i915/gt/intel_gt.c | 12 +-
drivers/gpu/drm/i915/gt/intel_sseu.c | 246 +++++++++++--------
drivers/gpu/drm/i915/gt/intel_sseu.h | 78 +++---
drivers/gpu/drm/i915/gt/intel_sseu_debugfs.c | 30 +--
drivers/gpu/drm/i915/gt/intel_workarounds.c | 24 +-
drivers/gpu/drm/i915/i915_getparam.c | 3 +-
drivers/gpu/drm/i915/i915_query.c | 8 +-
9 files changed, 226 insertions(+), 184 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c
index ab4c5ab28e4d..a3bb73f5d53b 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
@@ -1875,6 +1875,7 @@ i915_gem_user_to_context_sseu(struct intel_gt *gt,
{
const struct sseu_dev_info *device = >->info.sseu;
struct drm_i915_private *i915 = gt->i915;
+ unsigned int dev_subslice_mask = intel_sseu_get_hsw_subslices(device, 0);
/* No zeros in any field. */
if (!user->slice_mask || !user->subslice_mask ||
@@ -1901,7 +1902,7 @@ i915_gem_user_to_context_sseu(struct intel_gt *gt,
if (user->slice_mask & ~device->slice_mask)
return -EINVAL;
- if (user->subslice_mask & ~device->subslice_mask[0])
+ if (user->subslice_mask & ~dev_subslice_mask)
return -EINVAL;
if (user->max_eus_per_subslice > device->max_eus_per_subslice)
@@ -1915,7 +1916,7 @@ i915_gem_user_to_context_sseu(struct intel_gt *gt,
/* Part specific restrictions. */
if (GRAPHICS_VER(i915) == 11) {
unsigned int hw_s = hweight8(device->slice_mask);
- unsigned int hw_ss_per_s = hweight8(device->subslice_mask[0]);
+ unsigned int hw_ss_per_s = hweight8(dev_subslice_mask);
unsigned int req_s = hweight8(context->slice_mask);
unsigned int req_ss = hweight8(context->subslice_mask);
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_cs.c b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
index 1adbf34c3632..f0acf8518a51 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
@@ -674,8 +674,8 @@ static void engine_mask_apply_compute_fuses(struct intel_gt *gt)
if (GRAPHICS_VER_FULL(i915) < IP_VER(12, 50))
return;
- ccs_mask = intel_slicemask_from_dssmask(intel_sseu_get_compute_subslices(&info->sseu),
- ss_per_ccs);
+ ccs_mask = intel_slicemask_from_xehp_dssmask(info->sseu.compute_subslice_mask,
+ ss_per_ccs);
/*
* If all DSS in a quadrant are fused off, the corresponding CCS
* engine is not available for use.
diff --git a/drivers/gpu/drm/i915/gt/intel_gt.c b/drivers/gpu/drm/i915/gt/intel_gt.c
index 034182f85501..2921f510642f 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt.c
@@ -133,13 +133,6 @@ static const struct intel_mmio_range dg2_lncf_steering_table[] = {
{},
};
-static u16 slicemask(struct intel_gt *gt, int count)
-{
- u64 dss_mask = intel_sseu_get_subslices(>->info.sseu, 0);
-
- return intel_slicemask_from_dssmask(dss_mask, count);
-}
-
int intel_gt_init_mmio(struct intel_gt *gt)
{
struct drm_i915_private *i915 = gt->i915;
@@ -155,9 +148,12 @@ int intel_gt_init_mmio(struct intel_gt *gt)
*/
if (HAS_MSLICES(i915)) {
gt->info.mslice_mask =
- slicemask(gt, GEN_DSS_PER_MSLICE) |
+ intel_slicemask_from_xehp_dssmask(gt->info.sseu.subslice_mask,
+ GEN_DSS_PER_MSLICE);
+ gt->info.mslice_mask |=
(intel_uncore_read(gt->uncore, GEN10_MIRROR_FUSE3) &
GEN12_MEML3_EN_MASK);
+
if (!gt->info.mslice_mask) /* should be impossible! */
drm_warn(&i915->drm, "mslice mask all zero!\n");
}
diff --git a/drivers/gpu/drm/i915/gt/intel_sseu.c b/drivers/gpu/drm/i915/gt/intel_sseu.c
index d89e2e0f05e5..e1bce8a9044e 100644
--- a/drivers/gpu/drm/i915/gt/intel_sseu.c
+++ b/drivers/gpu/drm/i915/gt/intel_sseu.c
@@ -28,54 +28,23 @@ intel_sseu_subslice_total(const struct sseu_dev_info *sseu)
{
unsigned int i, total = 0;
- for (i = 0; i < ARRAY_SIZE(sseu->subslice_mask); i++)
- total += hweight8(sseu->subslice_mask[i]);
+ if (sseu->has_xehp_dss)
+ return bitmap_weight(sseu->subslice_mask.xehp,
+ I915_MAX_SS_FUSE_BITS);
- return total;
-}
-
-static u32
-sseu_get_subslices(const struct sseu_dev_info *sseu,
- const u8 *subslice_mask, u8 slice)
-{
- int i, offset = slice * sseu->ss_stride;
- u32 mask = 0;
-
- GEM_BUG_ON(slice >= sseu->max_slices);
-
- for (i = 0; i < sseu->ss_stride; i++)
- mask |= (u32)subslice_mask[offset + i] << i * BITS_PER_BYTE;
-
- return mask;
-}
-
-u32 intel_sseu_get_subslices(const struct sseu_dev_info *sseu, u8 slice)
-{
- return sseu_get_subslices(sseu, sseu->subslice_mask, slice);
-}
+ for (i = 0; i < ARRAY_SIZE(sseu->subslice_mask.hsw); i++)
+ total += hweight8(sseu->subslice_mask.hsw[i]);
-static u32 sseu_get_geometry_subslices(const struct sseu_dev_info *sseu)
-{
- return sseu_get_subslices(sseu, sseu->geometry_subslice_mask, 0);
-}
-
-u32 intel_sseu_get_compute_subslices(const struct sseu_dev_info *sseu)
-{
- return sseu_get_subslices(sseu, sseu->compute_subslice_mask, 0);
-}
-
-void intel_sseu_set_subslices(struct sseu_dev_info *sseu, int slice,
- u8 *subslice_mask, u32 ss_mask)
-{
- int offset = slice * sseu->ss_stride;
-
- memcpy(&subslice_mask[offset], &ss_mask, sseu->ss_stride);
+ return total;
}
unsigned int
-intel_sseu_subslices_per_slice(const struct sseu_dev_info *sseu, u8 slice)
+intel_sseu_get_hsw_subslices(const struct sseu_dev_info *sseu, u8 slice)
{
- return hweight32(intel_sseu_get_subslices(sseu, slice));
+ WARN_ON(sseu->has_xehp_dss);
+ WARN_ON(slice >= sseu->max_slices);
Might as well "if (WARN_ON) return 0" since it's there, to avoid reading
random memmory.
+
+ return sseu->subslice_mask.hsw[slice];
}
static u16 sseu_get_eus(const struct sseu_dev_info *sseu, int slice,
@@ -148,32 +117,65 @@ int intel_sseu_copy_eumask_to_user(void __user *to,
return copy_to_user(to, eu_mask, len);
}
+/**
+ * intel_sseu_copy_ssmask_to_user - Copy subslice mask into a userspace buffer
+ * @to: Pointer to userspace buffer to copy to
+ * @sseu: SSEU structure containing subslice mask to copy
+ *
+ * Copies the subslice mask to a userspace buffer in the format expected by
+ * the query ioctl's topology queries.
+ *
+ * Returns the result of the copy_to_user() operation.
+ */
+int intel_sseu_copy_ssmask_to_user(void __user *to,
+ const struct sseu_dev_info *sseu)
+{
+ u8 ss_mask[GEN_SS_MASK_SIZE] = {};
+ int len = sseu->max_slices * sseu->ss_stride;
Ah yes.. ss_stride. I definitely suggest to eliminate it from the kernel
struct.
+ int s, ss, i;
+
+ for (s = 0; s < sseu->max_slices; s++) {
+ for (ss = 0; ss < sseu->max_subslices; ss++) {
+ i = s * sseu->ss_stride * BITS_PER_BYTE + ss;
+
+ if (!intel_sseu_has_subslice(sseu, s, ss))
+ continue;
+
+ ss_mask[i / BITS_PER_BYTE] |= BIT(i % BITS_PER_BYTE);
+ }
+ }
+
+ return copy_to_user(to, ss_mask, len);
+}
+
static void gen11_compute_sseu_info(struct sseu_dev_info *sseu,
- u32 g_ss_en, u32 c_ss_en, u16 eu_en)
+ u32 ss_en, u16 eu_en)
{
u32 valid_ss_mask = GENMASK(sseu->max_subslices - 1, 0);
int ss;
- /* g_ss_en/c_ss_en represent entire subslice mask across all slices */
- GEM_BUG_ON(sseu->max_slices * sseu->max_subslices >
- sizeof(g_ss_en) * BITS_PER_BYTE);
+ sseu->slice_mask |= BIT(0);
+ sseu->subslice_mask.hsw[0] = ss_en & valid_ss_mask;
+
+ for (ss = 0; ss < sseu->max_subslices; ss++)
+ if (intel_sseu_has_subslice(sseu, 0, ss))
+ sseu_set_eus(sseu, 0, ss, eu_en);
+
+ sseu->eu_per_subslice = hweight16(eu_en);
+ sseu->eu_total = compute_eu_total(sseu);
+}
+
+static void xehp_compute_sseu_info(struct sseu_dev_info *sseu,
+ u16 eu_en)
+{
+ int ss;
sseu->slice_mask |= BIT(0);
- /*
- * XeHP introduces the concept of compute vs geometry DSS. To reduce
- * variation between GENs around subslice usage, store a mask for both
- * the geometry and compute enabled masks since userspace will need to
- * be able to query these masks independently. Also compute a total
- * enabled subslice count for the purposes of selecting subslices to
- * use in a particular GEM context.
- */
- intel_sseu_set_subslices(sseu, 0, sseu->compute_subslice_mask,
- c_ss_en & valid_ss_mask);
- intel_sseu_set_subslices(sseu, 0, sseu->geometry_subslice_mask,
- g_ss_en & valid_ss_mask);
- intel_sseu_set_subslices(sseu, 0, sseu->subslice_mask,
- (g_ss_en | c_ss_en) & valid_ss_mask);
+ bitmap_or(sseu->subslice_mask.xehp,
+ sseu->compute_subslice_mask.xehp,
+ sseu->geometry_subslice_mask.xehp,
+ I915_MAX_SS_FUSE_BITS);
I still think it would have been better to have less coupling between
the datatype and I915_MAX_SS_FUSE_BITS define throughout (less chance of
things going out of sync), which can be achieved by adding a BITMAP_BITS
macro as mentioned before, but up to you at this point.
for (ss = 0; ss < sseu->max_subslices; ss++)
if (intel_sseu_has_subslice(sseu, 0, ss))
@@ -183,11 +185,31 @@ static void gen11_compute_sseu_info(struct sseu_dev_info *sseu,
sseu->eu_total = compute_eu_total(sseu);
}
+static void
+xehp_load_dss_mask(struct intel_uncore *uncore,
+ intel_sseu_ss_mask_t *ssmask,
+ int numregs,
+ ...)
+{
+ va_list argp;
+ u32 fuse_val[I915_MAX_SS_FUSE_REGS] = {};
+ int i;
+
+ if (WARN_ON(numregs > I915_MAX_SS_FUSE_REGS))
+ numregs = I915_MAX_SS_FUSE_REGS;
+
+ va_start(argp, numregs);
+ for (i = 0; i < numregs; i++)
+ fuse_val[i] = intel_uncore_read(uncore, va_arg(argp, i915_reg_t));
+ va_end(argp);
+
+ bitmap_from_arr32(ssmask->xehp, fuse_val, numregs * 32);
+}
+
static void xehp_sseu_info_init(struct intel_gt *gt)
{
struct sseu_dev_info *sseu = >->info.sseu;
struct intel_uncore *uncore = gt->uncore;
- u32 g_dss_en, c_dss_en = 0;
u16 eu_en = 0;
u8 eu_en_fuse;
int eu;
@@ -201,8 +223,10 @@ static void xehp_sseu_info_init(struct intel_gt *gt)
intel_sseu_set_info(sseu, 1, 32, 16);
sseu->has_xehp_dss = 1;
- g_dss_en = intel_uncore_read(uncore, GEN12_GT_GEOMETRY_DSS_ENABLE);
- c_dss_en = intel_uncore_read(uncore, GEN12_GT_COMPUTE_DSS_ENABLE);
+ xehp_load_dss_mask(uncore, &sseu->geometry_subslice_mask, 1,
+ GEN12_GT_GEOMETRY_DSS_ENABLE);
+ xehp_load_dss_mask(uncore, &sseu->compute_subslice_mask, 1,
+ GEN12_GT_COMPUTE_DSS_ENABLE);
eu_en_fuse = intel_uncore_read(uncore, XEHP_EU_ENABLE) & XEHP_EU_ENA_MASK;
@@ -210,7 +234,7 @@ static void xehp_sseu_info_init(struct intel_gt *gt)
if (eu_en_fuse & BIT(eu))
eu_en |= BIT(eu * 2) | BIT(eu * 2 + 1);
- gen11_compute_sseu_info(sseu, g_dss_en, c_dss_en, eu_en);
+ xehp_compute_sseu_info(sseu, eu_en);
}
static void gen12_sseu_info_init(struct intel_gt *gt)
@@ -250,7 +274,7 @@ static void gen12_sseu_info_init(struct intel_gt *gt)
if (eu_en_fuse & BIT(eu))
eu_en |= BIT(eu * 2) | BIT(eu * 2 + 1);
- gen11_compute_sseu_info(sseu, g_dss_en, 0, eu_en);
+ gen11_compute_sseu_info(sseu, g_dss_en, eu_en);
/* TGL only supports slice-level power gating */
sseu->has_slice_pg = 1;
@@ -284,7 +308,7 @@ static void gen11_sseu_info_init(struct intel_gt *gt)
eu_en = ~(intel_uncore_read(uncore, GEN11_EU_DISABLE) &
GEN11_EU_DIS_MASK);
- gen11_compute_sseu_info(sseu, ss_en, 0, eu_en);
+ gen11_compute_sseu_info(sseu, ss_en, eu_en);
/* ICL has no power gating restrictions. */
sseu->has_slice_pg = 1;
@@ -296,7 +320,6 @@ static void cherryview_sseu_info_init(struct intel_gt *gt)
{
struct sseu_dev_info *sseu = >->info.sseu;
u32 fuse;
- u8 subslice_mask = 0;
fuse = intel_uncore_read(gt->uncore, CHV_FUSE_GT);
@@ -310,7 +333,7 @@ static void cherryview_sseu_info_init(struct intel_gt *gt)
(((fuse & CHV_FGT_EU_DIS_SS0_R1_MASK) >>
CHV_FGT_EU_DIS_SS0_R1_SHIFT) << 4);
- subslice_mask |= BIT(0);
+ sseu->subslice_mask.hsw[0] |= BIT(0);
sseu_set_eus(sseu, 0, 0, ~disabled_mask);
}
@@ -321,12 +344,10 @@ static void cherryview_sseu_info_init(struct intel_gt *gt)
(((fuse & CHV_FGT_EU_DIS_SS1_R1_MASK) >>
CHV_FGT_EU_DIS_SS1_R1_SHIFT) << 4);
- subslice_mask |= BIT(1);
+ sseu->subslice_mask.hsw[0] |= BIT(1);
sseu_set_eus(sseu, 0, 1, ~disabled_mask);
}
- intel_sseu_set_subslices(sseu, 0, sseu->subslice_mask, subslice_mask);
-
sseu->eu_total = compute_eu_total(sseu);
/*
@@ -381,8 +402,7 @@ static void gen9_sseu_info_init(struct intel_gt *gt)
/* skip disabled slice */
continue;
- intel_sseu_set_subslices(sseu, s, sseu->subslice_mask,
- subslice_mask);
+ sseu->subslice_mask.hsw[s] = subslice_mask;
eu_disable = intel_uncore_read(uncore, GEN9_EU_DISABLE(s));
for (ss = 0; ss < sseu->max_subslices; ss++) {
@@ -439,8 +459,8 @@ static void gen9_sseu_info_init(struct intel_gt *gt)
sseu->has_eu_pg = sseu->eu_per_subslice > 2;
if (IS_GEN9_LP(i915)) {
-#define IS_SS_DISABLED(ss) (!(sseu->subslice_mask[0] & BIT(ss)))
- info->has_pooled_eu = hweight8(sseu->subslice_mask[0]) == 3;
+#define IS_SS_DISABLED(ss) (!(sseu->subslice_mask.hsw[0] & BIT(ss)))
+ info->has_pooled_eu = hweight8(sseu->subslice_mask.hsw[0]) == 3;
sseu->min_eu_in_pool = 0;
if (info->has_pooled_eu) {
@@ -494,8 +514,7 @@ static void bdw_sseu_info_init(struct intel_gt *gt)
/* skip disabled slice */
continue;
- intel_sseu_set_subslices(sseu, s, sseu->subslice_mask,
- subslice_mask);
+ sseu->subslice_mask.hsw[s] = subslice_mask;
for (ss = 0; ss < sseu->max_subslices; ss++) {
u8 eu_disabled_mask;
@@ -592,8 +611,7 @@ static void hsw_sseu_info_init(struct intel_gt *gt)
sseu->eu_per_subslice);
for (s = 0; s < sseu->max_slices; s++) {
- intel_sseu_set_subslices(sseu, s, sseu->subslice_mask,
- subslice_mask);
+ sseu->subslice_mask.hsw[s] = subslice_mask;
for (ss = 0; ss < sseu->max_subslices; ss++) {
sseu_set_eus(sseu, s, ss,
@@ -682,7 +700,7 @@ u32 intel_sseu_make_rpcs(struct intel_gt *gt,
*/
if (GRAPHICS_VER(i915) == 11 &&
slices == 1 &&
- subslices > min_t(u8, 4, hweight8(sseu->subslice_mask[0]) / 2)) {
+ subslices > min_t(u8, 4, hweight8(sseu->subslice_mask.hsw[0]) / 2)) {
GEM_BUG_ON(subslices & 1);
subslice_pg = false;
@@ -748,14 +766,25 @@ void intel_sseu_dump(const struct sseu_dev_info *sseu, struct drm_printer *p)
{
int s;
- drm_printf(p, "slice total: %u, mask=%04x\n",
- hweight8(sseu->slice_mask), sseu->slice_mask);
- drm_printf(p, "subslice total: %u\n", intel_sseu_subslice_total(sseu));
- for (s = 0; s < sseu->max_slices; s++) {
- drm_printf(p, "slice%d: %u subslices, mask=%08x\n",
- s, intel_sseu_subslices_per_slice(sseu, s),
- intel_sseu_get_subslices(sseu, s));
+ if (sseu->has_xehp_dss) {
+ drm_printf(p, "subslice total: %u\n",
+ intel_sseu_subslice_total(sseu));
+ drm_printf(p, "subslice mask=%*pb\n", I915_MAX_SS_FUSE_BITS,
+ sseu->subslice_mask.xehp);
Do you perhaps want to use the DSS terminology here? Any point to dump
compute and geometry separately?
+ } else {
+ drm_printf(p, "slice total: %u, mask=%04x\n",
+ hweight8(sseu->slice_mask), sseu->slice_mask);
+ drm_printf(p, "subslice total: %u\n",
+ intel_sseu_subslice_total(sseu));
+
+ for (s = 0; s < sseu->max_slices; s++) {
+ u8 ss_mask = sseu->subslice_mask.hsw[s];
+
+ drm_printf(p, "slice%d: %u subslices, mask=%08x\n",
+ s, hweight8(ss_mask), ss_mask);
+ }
}
+
drm_printf(p, "EU total: %u\n", sseu->eu_total);
drm_printf(p, "EU per subslice: %u\n", sseu->eu_per_subslice);
drm_printf(p, "has slice power gating: %s\n",
@@ -772,9 +801,10 @@ static void sseu_print_hsw_topology(const struct sseu_dev_info *sseu,
int s, ss;
for (s = 0; s < sseu->max_slices; s++) {
+ u8 ss_mask = sseu->subslice_mask.hsw[s];
+
drm_printf(p, "slice%d: %u subslice(s) (0x%08x):\n",
- s, intel_sseu_subslices_per_slice(sseu, s),
- intel_sseu_get_subslices(sseu, s));
+ s, hweight8(ss_mask), ss_mask);
for (ss = 0; ss < sseu->max_subslices; ss++) {
u16 enabled_eus = sseu_get_eus(sseu, s, ss);
@@ -788,16 +818,14 @@ static void sseu_print_hsw_topology(const struct sseu_dev_info *sseu,
static void sseu_print_xehp_topology(const struct sseu_dev_info *sseu,
struct drm_printer *p)
{
- u32 g_dss_mask = sseu_get_geometry_subslices(sseu);
- u32 c_dss_mask = intel_sseu_get_compute_subslices(sseu);
int dss;
for (dss = 0; dss < sseu->max_subslices; dss++) {
u16 enabled_eus = sseu_get_eus(sseu, 0, dss);
drm_printf(p, "DSS_%02d: G:%3s C:%3s, %2u EUs (0x%04hx)\n", dss,
- str_yes_no(g_dss_mask & BIT(dss)),
- str_yes_no(c_dss_mask & BIT(dss)),
+ str_yes_no(test_bit(dss, sseu->geometry_subslice_mask.xehp)),
+ str_yes_no(test_bit(dss, sseu->compute_subslice_mask.xehp)),
hweight16(enabled_eus), enabled_eus);
}
}
@@ -815,20 +843,40 @@ void intel_sseu_print_topology(struct drm_i915_private *i915,
}
}
-u16 intel_slicemask_from_dssmask(u64 dss_mask, int dss_per_slice)
+void intel_sseu_print_ss_info(const char* type,
+ const struct sseu_dev_info *sseu,
+ struct seq_file *m)
+{
+ int s;
+
+ if (sseu->has_xehp_dss)
+ seq_printf(m, " %s Subslices: %u\n", type,
+ bitmap_weight(sseu->subslice_mask.xehp,
+ I915_MAX_SS_FUSE_BITS));
Same question on whether to use DSS and log them separately.
+ else
+ for (s = 0; s < fls(sseu->slice_mask); s++)
+ seq_printf(m, " %s Slice%i subslices: %u\n", type,
+ s, hweight8(sseu->subslice_mask.hsw[s]));
+}
+
+u16 intel_slicemask_from_xehp_dssmask(intel_sseu_ss_mask_t dss_mask,
+ int dss_per_slice)
{
+ intel_sseu_ss_mask_t per_slice_mask = {};
u16 slice_mask = 0;
int i;
- WARN_ON(sizeof(dss_mask) * 8 / dss_per_slice > 8 * sizeof(slice_mask));
+ WARN_ON(DIV_ROUND_UP(I915_MAX_SS_FUSE_BITS, dss_per_slice) >
+ 8 * sizeof(slice_mask));
- for (i = 0; dss_mask; i++) {
- if (dss_mask & GENMASK(dss_per_slice - 1, 0))
+ bitmap_fill(per_slice_mask.xehp, dss_per_slice);
+ for (i = 0; !bitmap_empty(dss_mask.xehp, I915_MAX_SS_FUSE_BITS); i++) {
+ if (bitmap_intersects(dss_mask.xehp, per_slice_mask.xehp, dss_per_slice))
slice_mask |= BIT(i);
- dss_mask >>= dss_per_slice;
+ bitmap_shift_right(dss_mask.xehp, dss_mask.xehp, dss_per_slice,
+ I915_MAX_SS_FUSE_BITS);
}
return slice_mask;
}
-
diff --git a/drivers/gpu/drm/i915/gt/intel_sseu.h b/drivers/gpu/drm/i915/gt/intel_sseu.h
index 43a8f8f98687..7fbb9276a1c2 100644
--- a/drivers/gpu/drm/i915/gt/intel_sseu.h
+++ b/drivers/gpu/drm/i915/gt/intel_sseu.h
@@ -25,12 +25,16 @@ struct drm_printer;
/*
* Maximum number of subslices that can exist within a HSW-style slice. This
* is only relevant to pre-Xe_HP platforms (Xe_HP and beyond use the
- * GEN_MAX_DSS value below).
+ * I915_MAX_SS_FUSE_BITS value below).
*/
#define GEN_MAX_SS_PER_HSW_SLICE 6
-/* Maximum number of DSS on newer platforms (Xe_HP and beyond). */
-#define GEN_MAX_DSS 32
+/*
+ * Maximum number of 32-bit registers used by hardware to express the
+ * enabled/disabled subslices.
+ */
+#define I915_MAX_SS_FUSE_REGS 1
+#define I915_MAX_SS_FUSE_BITS (I915_MAX_SS_FUSE_REGS * 32)
/* Maximum number of EUs that can exist within a subslice or DSS. */
#define GEN_MAX_EUS_PER_SS 16
@@ -38,7 +42,7 @@ struct drm_printer;
#define SSEU_MAX(a, b) ((a) > (b) ? (a) : (b))
/* The maximum number of bits needed to express each subslice/DSS independently */
-#define GEN_SS_MASK_SIZE SSEU_MAX(GEN_MAX_DSS, \
+#define GEN_SS_MASK_SIZE SSEU_MAX(I915_MAX_SS_FUSE_BITS, \
GEN_MAX_HSW_SLICES * GEN_MAX_SS_PER_HSW_SLICE)
#define GEN_SSEU_STRIDE(max_entries) DIV_ROUND_UP(max_entries, BITS_PER_BYTE)
@@ -49,17 +53,24 @@ struct drm_printer;
#define GEN_DSS_PER_CSLICE 8
#define GEN_DSS_PER_MSLICE 8
-#define GEN_MAX_GSLICES (GEN_MAX_DSS / GEN_DSS_PER_GSLICE)
-#define GEN_MAX_CSLICES (GEN_MAX_DSS / GEN_DSS_PER_CSLICE)
+#define GEN_MAX_GSLICES (I915_MAX_SS_FUSE_BITS / GEN_DSS_PER_GSLICE)
+#define GEN_MAX_CSLICES (I915_MAX_SS_FUSE_BITS / GEN_DSS_PER_CSLICE)
+
+typedef union {
+ u8 hsw[GEN_MAX_HSW_SLICES];
+
+ /* Bitmap compatible with linux/bitmap.h; may exceed size of u64 */
+ unsigned long xehp[BITS_TO_LONGS(I915_MAX_SS_FUSE_BITS)];
+} intel_sseu_ss_mask_t;
struct sseu_dev_info {
u8 slice_mask;
- u8 subslice_mask[GEN_SS_MASK_SIZE];
- u8 geometry_subslice_mask[GEN_SS_MASK_SIZE];
- u8 compute_subslice_mask[GEN_SS_MASK_SIZE];
+ intel_sseu_ss_mask_t subslice_mask;
+ intel_sseu_ss_mask_t geometry_subslice_mask;
+ intel_sseu_ss_mask_t compute_subslice_mask;
union {
u16 hsw[GEN_MAX_HSW_SLICES][GEN_MAX_SS_PER_HSW_SLICE];
- u16 xehp[GEN_MAX_DSS];
+ u16 xehp[I915_MAX_SS_FUSE_BITS];
} eu_mask;
u16 eu_total;
@@ -100,7 +111,7 @@ intel_sseu_from_device_info(const struct sseu_dev_info *sseu)
{
struct intel_sseu value = {
.slice_mask = sseu->slice_mask,
- .subslice_mask = sseu->subslice_mask[0],
+ .subslice_mask = sseu->subslice_mask.hsw[0],
.min_eus_per_subslice = sseu->max_eus_per_subslice,
.max_eus_per_subslice = sseu->max_eus_per_subslice,
};
@@ -112,18 +123,23 @@ static inline bool
intel_sseu_has_subslice(const struct sseu_dev_info *sseu, int slice,
int subslice)
{
- u8 mask;
- int ss_idx = subslice / BITS_PER_BYTE;
-
- if (slice >= sseu->max_slices ||
- subslice >= sseu->max_subslices)
- return false;
-
- GEM_BUG_ON(ss_idx >= sseu->ss_stride);
Range checks are not interesting any more?
-
- mask = sseu->subslice_mask[slice * sseu->ss_stride + ss_idx];
+ if (sseu->has_xehp_dss)
+ return test_bit(subslice, sseu->subslice_mask.xehp);
+ else
+ return sseu->subslice_mask.hsw[slice] & BIT(subslice);
+}
- return mask & BIT(subslice % BITS_PER_BYTE);
+/*
+ * 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.
+ */
+static inline unsigned int
+intel_sseu_find_first_xehp_dss(const struct sseu_dev_info *sseu, int groupsize,
+ int groupnum)
+{
+ return find_next_bit(sseu->subslice_mask.xehp, I915_MAX_SS_FUSE_BITS,
+ groupnum * groupsize);
}
void intel_sseu_set_info(struct sseu_dev_info *sseu, u8 max_slices,
@@ -133,14 +149,10 @@ unsigned int
intel_sseu_subslice_total(const struct sseu_dev_info *sseu);
unsigned int
-intel_sseu_subslices_per_slice(const struct sseu_dev_info *sseu, u8 slice);
-
-u32 intel_sseu_get_subslices(const struct sseu_dev_info *sseu, u8 slice);
+intel_sseu_get_hsw_subslices(const struct sseu_dev_info *sseu, u8 slice);
-u32 intel_sseu_get_compute_subslices(const struct sseu_dev_info *sseu);
-
-void intel_sseu_set_subslices(struct sseu_dev_info *sseu, int slice,
- u8 *subslice_mask, u32 ss_mask);
+intel_sseu_ss_mask_t
+intel_sseu_get_compute_subslices(const struct sseu_dev_info *sseu);
void intel_sseu_info_init(struct intel_gt *gt);
@@ -152,9 +164,15 @@ void intel_sseu_print_topology(struct drm_i915_private *i915,
const struct sseu_dev_info *sseu,
struct drm_printer *p);
-u16 intel_slicemask_from_dssmask(u64 dss_mask, int dss_per_slice);
+u16 intel_slicemask_from_xehp_dssmask(intel_sseu_ss_mask_t dss_mask, int dss_per_slice);
int intel_sseu_copy_eumask_to_user(void __user *to,
const struct sseu_dev_info *sseu);
+int intel_sseu_copy_ssmask_to_user(void __user *to,
+ const struct sseu_dev_info *sseu);
+
+void intel_sseu_print_ss_info(const char* type,
+ const struct sseu_dev_info *sseu,
+ struct seq_file *m);
#endif /* __INTEL_SSEU_H__ */
diff --git a/drivers/gpu/drm/i915/gt/intel_sseu_debugfs.c b/drivers/gpu/drm/i915/gt/intel_sseu_debugfs.c
index 2d5d011e01db..c2ee5e1826b5 100644
--- a/drivers/gpu/drm/i915/gt/intel_sseu_debugfs.c
+++ b/drivers/gpu/drm/i915/gt/intel_sseu_debugfs.c
@@ -4,6 +4,7 @@
* Copyright © 2020 Intel Corporation
*/
+#include <linux/bitmap.h>
#include <linux/string_helpers.h>
#include "i915_drv.h"
@@ -11,14 +12,6 @@
#include "intel_gt_regs.h"
#include "intel_sseu_debugfs.h"
-static void sseu_copy_subslices(const struct sseu_dev_info *sseu,
- int slice, u8 *to_mask)
-{
- int offset = slice * sseu->ss_stride;
-
- memcpy(&to_mask[offset], &sseu->subslice_mask[offset], sseu->ss_stride);
-}
-
static void cherryview_sseu_device_status(struct intel_gt *gt,
struct sseu_dev_info *sseu)
{
@@ -41,7 +34,7 @@ static void cherryview_sseu_device_status(struct intel_gt *gt,
continue;
sseu->slice_mask = BIT(0);
- sseu->subslice_mask[0] |= BIT(ss);
+ sseu->subslice_mask.hsw[0] |= BIT(ss);
eu_cnt = ((sig1[ss] & CHV_EU08_PG_ENABLE) ? 0 : 2) +
((sig1[ss] & CHV_EU19_PG_ENABLE) ? 0 : 2) +
((sig1[ss] & CHV_EU210_PG_ENABLE) ? 0 : 2) +
@@ -92,7 +85,7 @@ static void gen11_sseu_device_status(struct intel_gt *gt,
continue;
sseu->slice_mask |= BIT(s);
- sseu_copy_subslices(&info->sseu, s, sseu->subslice_mask);
+ sseu->subslice_mask.hsw[s] = info->sseu.subslice_mask.hsw[s];
for (ss = 0; ss < info->sseu.max_subslices; ss++) {
unsigned int eu_cnt;
@@ -147,21 +140,17 @@ static void gen9_sseu_device_status(struct intel_gt *gt,
sseu->slice_mask |= BIT(s);
if (IS_GEN9_BC(gt->i915))
- sseu_copy_subslices(&info->sseu, s,
- sseu->subslice_mask);
+ sseu->subslice_mask.hsw[s] = info->sseu.subslice_mask.hsw[s];
for (ss = 0; ss < info->sseu.max_subslices; ss++) {
unsigned int eu_cnt;
- u8 ss_idx = s * info->sseu.ss_stride +
- ss / BITS_PER_BYTE;
if (IS_GEN9_LP(gt->i915)) {
if (!(s_reg[s] & (GEN9_PGCTL_SS_ACK(ss))))
/* skip disabled subslice */
continue;
- sseu->subslice_mask[ss_idx] |=
- BIT(ss % BITS_PER_BYTE);
+ sseu->subslice_mask.hsw[s] |= BIT(ss);
}
eu_cnt = eu_reg[2 * s + ss / 2] & eu_mask[ss % 2];
@@ -188,8 +177,7 @@ static void bdw_sseu_device_status(struct intel_gt *gt,
if (sseu->slice_mask) {
sseu->eu_per_subslice = info->sseu.eu_per_subslice;
for (s = 0; s < fls(sseu->slice_mask); s++)
- sseu_copy_subslices(&info->sseu, s,
- sseu->subslice_mask);
+ sseu->subslice_mask.hsw[s] = info->sseu.subslice_mask.hsw[s];
sseu->eu_total = sseu->eu_per_subslice *
intel_sseu_subslice_total(sseu);
@@ -208,7 +196,6 @@ static void i915_print_sseu_info(struct seq_file *m,
const struct sseu_dev_info *sseu)
{
const char *type = is_available_info ? "Available" : "Enabled";
- int s;
seq_printf(m, " %s Slice Mask: %04x\n", type,
sseu->slice_mask);
@@ -216,10 +203,7 @@ static void i915_print_sseu_info(struct seq_file *m,
hweight8(sseu->slice_mask));
seq_printf(m, " %s Subslice Total: %u\n", type,
intel_sseu_subslice_total(sseu));
- for (s = 0; s < fls(sseu->slice_mask); s++) {
- seq_printf(m, " %s Slice%i subslices: %u\n", type,
- s, intel_sseu_subslices_per_slice(sseu, s));
- }
+ intel_sseu_print_ss_info(type, sseu, m);
seq_printf(m, " %s EU Total: %u\n", type,
sseu->eu_total);
seq_printf(m, " %s EU Per Subslice: %u\n", type,
diff --git a/drivers/gpu/drm/i915/gt/intel_workarounds.c b/drivers/gpu/drm/i915/gt/intel_workarounds.c
index 756807c4b405..fc6274708f8e 100644
--- a/drivers/gpu/drm/i915/gt/intel_workarounds.c
+++ b/drivers/gpu/drm/i915/gt/intel_workarounds.c
@@ -948,8 +948,8 @@ gen9_wa_init_mcr(struct drm_i915_private *i915, struct i915_wa_list *wal)
* on s/ss combo, the read should be done with read_subslice_reg.
*/
slice = ffs(sseu->slice_mask) - 1;
- GEM_BUG_ON(slice >= ARRAY_SIZE(sseu->subslice_mask));
- subslice = ffs(intel_sseu_get_subslices(sseu, slice));
+ GEM_BUG_ON(slice >= ARRAY_SIZE(sseu->subslice_mask.hsw));
+ subslice = ffs(intel_sseu_get_hsw_subslices(sseu, slice));
GEM_BUG_ON(!subslice);
subslice--;
@@ -1087,11 +1087,10 @@ static void
icl_wa_init_mcr(struct intel_gt *gt, struct i915_wa_list *wal)
{
const struct sseu_dev_info *sseu = >->info.sseu;
- unsigned int slice, subslice;
+ unsigned int subslice;
GEM_BUG_ON(GRAPHICS_VER(gt->i915) < 11);
GEM_BUG_ON(hweight8(sseu->slice_mask) > 1);
- slice = 0;
/*
* Although a platform may have subslices, we need to always steer
@@ -1102,7 +1101,7 @@ icl_wa_init_mcr(struct intel_gt *gt, struct i915_wa_list *wal)
* one of the higher subslices, we run the risk of reading back 0's or
* random garbage.
*/
- subslice = __ffs(intel_sseu_get_subslices(sseu, slice));
+ subslice = __ffs(intel_sseu_get_hsw_subslices(sseu, 0));
/*
* If the subslice we picked above also steers us to a valid L3 bank,
@@ -1112,7 +1111,7 @@ icl_wa_init_mcr(struct intel_gt *gt, struct i915_wa_list *wal)
if (gt->info.l3bank_mask & BIT(subslice))
gt->steering_table[L3BANK] = NULL;
- __add_mcr_wa(gt, wal, slice, subslice);
+ __add_mcr_wa(gt, wal, 0, subslice);
}
static void
@@ -1120,7 +1119,6 @@ xehp_init_mcr(struct intel_gt *gt, struct i915_wa_list *wal)
{
const struct sseu_dev_info *sseu = >->info.sseu;
unsigned long slice, subslice = 0, slice_mask = 0;
- u64 dss_mask = 0;
u32 lncf_mask = 0;
int i;
@@ -1151,8 +1149,8 @@ xehp_init_mcr(struct intel_gt *gt, struct i915_wa_list *wal)
*/
/* Find the potential gslice candidates */
- dss_mask = intel_sseu_get_subslices(sseu, 0);
- slice_mask = intel_slicemask_from_dssmask(dss_mask, GEN_DSS_PER_GSLICE);
+ slice_mask = intel_slicemask_from_xehp_dssmask(sseu->subslice_mask,
+ GEN_DSS_PER_GSLICE);
/*
* Find the potential LNCF candidates. Either LNCF within a valid
@@ -1177,9 +1175,8 @@ xehp_init_mcr(struct intel_gt *gt, struct i915_wa_list *wal)
}
slice = __ffs(slice_mask);
- subslice = __ffs(dss_mask >> (slice * GEN_DSS_PER_GSLICE));
+ subslice = intel_sseu_find_first_xehp_dss(sseu, GEN_DSS_PER_GSLICE, slice);
WARN_ON(subslice > GEN_DSS_PER_GSLICE);
- WARN_ON(dss_mask >> (slice * GEN_DSS_PER_GSLICE) == 0);
__add_mcr_wa(gt, wal, slice, subslice);
@@ -2030,9 +2027,8 @@ engine_fake_wa_init(struct intel_engine_cs *engine, struct i915_wa_list *wal)
static bool needs_wa_1308578152(struct intel_engine_cs *engine)
{
- u64 dss_mask = intel_sseu_get_subslices(&engine->gt->info.sseu, 0);
-
- return (dss_mask & GENMASK(GEN_DSS_PER_GSLICE - 1, 0)) == 0;
+ return intel_sseu_find_first_xehp_dss(&engine->gt->info.sseu, 0, 0) >
+ GEN_DSS_PER_GSLICE;
}
static void
diff --git a/drivers/gpu/drm/i915/i915_getparam.c b/drivers/gpu/drm/i915/i915_getparam.c
index ac9767c56619..6fd15b39570c 100644
--- a/drivers/gpu/drm/i915/i915_getparam.c
+++ b/drivers/gpu/drm/i915/i915_getparam.c
@@ -162,8 +162,7 @@ int i915_getparam_ioctl(struct drm_device *dev, void *data,
return -EINVAL;
/* Only copy bits from the first slice */
- memcpy(&value, sseu->subslice_mask,
- min(sseu->ss_stride, (u8)sizeof(value)));
+ value = intel_sseu_get_hsw_subslices(sseu, 0);
if (!value)
return -ENODEV;
break;
diff --git a/drivers/gpu/drm/i915/i915_query.c b/drivers/gpu/drm/i915/i915_query.c
index 16f43bf32a05..9afa6d1eaf95 100644
--- a/drivers/gpu/drm/i915/i915_query.c
+++ b/drivers/gpu/drm/i915/i915_query.c
@@ -31,7 +31,7 @@ static int copy_query_item(void *query_hdr, size_t query_sz,
static int fill_topology_info(const struct sseu_dev_info *sseu,
struct drm_i915_query_item *query_item,
- const u8 *subslice_mask)
+ intel_sseu_ss_mask_t subslice_mask)
{
struct drm_i915_query_topology_info topo;
u32 slice_length, subslice_length, eu_length, total_length;
@@ -71,9 +71,9 @@ static int fill_topology_info(const struct sseu_dev_info *sseu,
&sseu->slice_mask, slice_length))
return -EFAULT;
- if (copy_to_user(u64_to_user_ptr(query_item->data_ptr +
- sizeof(topo) + slice_length),
- subslice_mask, subslice_length))
+ if (intel_sseu_copy_ssmask_to_user(u64_to_user_ptr(query_item->data_ptr +
+ sizeof(topo) + slice_length),
+ sseu))
return -EFAULT;
if (intel_sseu_copy_eumask_to_user(u64_to_user_ptr(query_item->data_ptr +
Apart from the comments in this round I think I am happy with how it all
looks. I am happy to provide acks once the main changes I suggested are
implemented and couple questions answered. But I would prefer if you
would be able to find someone else for a more detailed review.
Regards,
Tvrtko
