From: Abdiel Janulgue <abdiel.janulgue at linux.intel.com>
A portion of device memory is reserved for Flat CCS so usable
device memory will be reduced by size of Flat CCS. Size of
Flat CCS is specified in “XEHPSDV_FLAT_CCS_BASE_ADDR”.
So to get effective device memory we need to subtract
total device memory by Flat CCS memory size.
v2:
Addressed the small bar related issue [Matt]
Removed a reduntant check [Matt]
Cc: Matthew Auld <matthew.auld at intel.com>
Signed-off-by: Abdiel Janulgue <abdiel.janulgue at linux.intel.com>
Signed-off-by: Ramalingam C <ramalingam.c at intel.com>
---
drivers/gpu/drm/i915/gt/intel_gt.c | 19 ++++++++++++++++
drivers/gpu/drm/i915/gt/intel_gt.h | 1 +
drivers/gpu/drm/i915/gt/intel_region_lmem.c | 24 +++++++++++++++++++--
drivers/gpu/drm/i915/i915_reg.h | 3 +++
4 files changed, 45 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/intel_gt.c b/drivers/gpu/drm/i915/gt/intel_gt.c
index f59933abbb3a..e40d98cb3a2d 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt.c
@@ -911,6 +911,25 @@ u32 intel_gt_read_register_fw(struct intel_gt *gt, i915_reg_t reg)
return intel_uncore_read_fw(gt->uncore, reg);
}
+u32 intel_gt_read_register(struct intel_gt *gt, i915_reg_t reg)
+{
+ int type;
+ u8 sliceid, subsliceid;
+
+ for (type = 0; type < NUM_STEERING_TYPES; type++) {
+ if (intel_gt_reg_needs_read_steering(gt, reg, type)) {
+ intel_gt_get_valid_steering(gt, type, &sliceid,
+ &subsliceid);
+ return intel_uncore_read_with_mcr_steering(gt->uncore,
+ reg,
+ sliceid,
+ subsliceid);
+ }
+ }
+
+ return intel_uncore_read(gt->uncore, reg);
+}
+
void intel_gt_info_print(const struct intel_gt_info *info,
struct drm_printer *p)
{
diff --git a/drivers/gpu/drm/i915/gt/intel_gt.h b/drivers/gpu/drm/i915/gt/intel_gt.h
index 2dad46c3eff2..0f571c8ee22b 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt.h
+++ b/drivers/gpu/drm/i915/gt/intel_gt.h
@@ -85,6 +85,7 @@ static inline bool intel_gt_needs_read_steering(struct intel_gt *gt,
}
u32 intel_gt_read_register_fw(struct intel_gt *gt, i915_reg_t reg);
+u32 intel_gt_read_register(struct intel_gt *gt, i915_reg_t reg);
void intel_gt_info_print(const struct intel_gt_info *info,
struct drm_printer *p);
diff --git a/drivers/gpu/drm/i915/gt/intel_region_lmem.c b/drivers/gpu/drm/i915/gt/intel_region_lmem.c
index 21215a080088..f1d37b46b505 100644
--- a/drivers/gpu/drm/i915/gt/intel_region_lmem.c
+++ b/drivers/gpu/drm/i915/gt/intel_region_lmem.c
@@ -205,8 +205,28 @@ static struct intel_memory_region *setup_lmem(struct intel_gt *gt)
if (!IS_DGFX(i915))
return ERR_PTR(-ENODEV);
- /* Stolen starts from GSMBASE on DG1 */
- lmem_size = intel_uncore_read64(uncore, GEN12_GSMBASE);
+ if (HAS_FLAT_CCS(i915)) {
+ u64 tile_stolen, flat_ccs_base_addr_reg, flat_ccs_base;
+
+ lmem_size = pci_resource_len(pdev, 2);
+ flat_ccs_base_addr_reg = intel_gt_read_register(gt, XEHPSDV_FLAT_CCS_BASE_ADDR);
+ flat_ccs_base = (flat_ccs_base_addr_reg >> XEHPSDV_CCS_BASE_SHIFT) * SZ_64K;
+
+ if (GEM_WARN_ON(lmem_size < flat_ccs_base))
+ return ERR_PTR(-ENODEV);
+
+ tile_stolen = lmem_size - flat_ccs_base;
+
+ /* If the FLAT_CCS_BASE_ADDR register is not populated, flag an error */
+ if (tile_stolen == lmem_size)
+ DRM_ERROR("CCS_BASE_ADDR register did not have expected value\n");
+
+ lmem_size -= tile_stolen;
+ } else {
+ /* Stolen starts from GSMBASE without CCS */
+ lmem_size = intel_uncore_read64(&i915->uncore, GEN12_GSMBASE);
+ }
+
io_start = pci_resource_start(pdev, 2);
if (GEM_WARN_ON(lmem_size > pci_resource_len(pdev, 2)))
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 0f36af8dc3a1..9b5423572fe9 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -11651,6 +11651,9 @@ enum skl_power_gate {
#define SGGI_DIS REG_BIT(15)
#define SGR_DIS REG_BIT(13)
+#define XEHPSDV_FLAT_CCS_BASE_ADDR _MMIO(0x4910)
+#define XEHPSDV_CCS_BASE_SHIFT 8
+
/* gamt regs */
#define GEN8_L3_LRA_1_GPGPU _MMIO(0x4dd4)
#define GEN8_L3_LRA_1_GPGPU_DEFAULT_VALUE_BDW 0x67F1427F /* max/min for LRA1/2 */
--
2.20.1