From c08c364102d07288610734de34111a666e730ae7 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Sat, 3 Feb 2024 00:43:28 +0200 Subject: [PATCH] drm/i915: Bypass LMEMBAR/GTTMMADR for MTL stolen memory access MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit On MTL accessing stolen memory via the BARs is somehow borked, and it can hang the machine. As a workaround let's bypass the BARs and just go straight to DSMBASE/GSMBASE instead. Note that on every other platform this itself would hang the machine, but on MTL the system firmware is expected to relax the access permission guarding stolen memory to enable this workaround, and thus direct CPU accesses should be fine. The raw stolen memory areas won't be passed to VMs so we'll need to risk using the BAR there for the initial setup. Once command submission is up we should switch to MI_UPDATE_GTT which at least shouldn't hang the whole machine. v2: Don't use direct GSM/DSM access on guests Add w/a number v3: Check register 0x138914 to see if pcode did its job Add some debug prints Cc: Joonas Lahtinen Reviewed-by: Andrzej Hajda Reviewed-by: Radhakrishna Sripada Reviewed-by: Nirmoy Das Tested-by: Paz Zcharya Signed-off-by: Ville Syrjälä Link: https://patchwork.freedesktop.org/patch/msgid/20240202224340.30647-5-ville.syrjala@linux.intel.com --- drivers/gpu/drm/i915/gem/i915_gem_stolen.c | 6 +++++- drivers/gpu/drm/i915/gt/intel_ggtt.c | 10 +++++++++- drivers/gpu/drm/i915/i915_reg.h | 3 +++ drivers/gpu/drm/i915/i915_utils.c | 17 +++++++++++++++++ drivers/gpu/drm/i915/i915_utils.h | 2 ++ 5 files changed, 36 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c index ee237043c302f..9ddcae9b39972 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c @@ -941,7 +941,11 @@ i915_gem_stolen_lmem_setup(struct drm_i915_private *i915, u16 type, dsm_size = ALIGN_DOWN(lmem_size - dsm_base, SZ_1M); } - if (pci_resource_len(pdev, GEN12_LMEM_BAR) < lmem_size) { + if (i915_direct_stolen_access(i915)) { + drm_dbg(&i915->drm, "Using direct DSM access\n"); + io_start = intel_uncore_read64(uncore, GEN12_DSMBASE) & GEN12_BDSM_MASK; + io_size = dsm_size; + } else if (pci_resource_len(pdev, GEN12_LMEM_BAR) < lmem_size) { io_start = 0; io_size = 0; } else { diff --git a/drivers/gpu/drm/i915/gt/intel_ggtt.c b/drivers/gpu/drm/i915/gt/intel_ggtt.c index 21a7e3191c182..bce5d80253401 100644 --- a/drivers/gpu/drm/i915/gt/intel_ggtt.c +++ b/drivers/gpu/drm/i915/gt/intel_ggtt.c @@ -24,6 +24,7 @@ #include "intel_ring.h" #include "i915_drv.h" #include "i915_pci.h" +#include "i915_reg.h" #include "i915_request.h" #include "i915_scatterlist.h" #include "i915_utils.h" @@ -1152,13 +1153,20 @@ static unsigned int gen6_gttadr_offset(struct drm_i915_private *i915) static int ggtt_probe_common(struct i915_ggtt *ggtt, u64 size) { struct drm_i915_private *i915 = ggtt->vm.i915; + struct intel_uncore *uncore = ggtt->vm.gt->uncore; struct pci_dev *pdev = to_pci_dev(i915->drm.dev); phys_addr_t phys_addr; u32 pte_flags; int ret; GEM_WARN_ON(pci_resource_len(pdev, GEN4_GTTMMADR_BAR) != gen6_gttmmadr_size(i915)); - phys_addr = pci_resource_start(pdev, GEN4_GTTMMADR_BAR) + gen6_gttadr_offset(i915); + + if (i915_direct_stolen_access(i915)) { + drm_dbg(&i915->drm, "Using direct GSM access\n"); + phys_addr = intel_uncore_read64(uncore, GEN12_GSMBASE) & GEN12_BDSM_MASK; + } else { + phys_addr = pci_resource_start(pdev, GEN4_GTTMMADR_BAR) + gen6_gttadr_offset(i915); + } if (needs_wc_ggtt_mapping(i915)) ggtt->gsm = ioremap_wc(phys_addr, size); diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 0b9e018256c76..c1bf70d62ead0 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -5414,6 +5414,9 @@ #define GEN6_PCODE_FREQ_RING_RATIO_SHIFT 16 #define GEN6_PCODE_DATA1 _MMIO(0x13812C) +#define MTL_PCODE_STOLEN_ACCESS _MMIO(0x138914) +#define STOLEN_ACCESS_ALLOWED 0x1 + /* IVYBRIDGE DPF */ #define GEN7_L3CDERRST1(slice) _MMIO(0xB008 + (slice) * 0x200) /* L3CD Error Status 1 */ #define GEN7_L3CDERRST1_ROW_MASK (0x7ff << 14) diff --git a/drivers/gpu/drm/i915/i915_utils.c b/drivers/gpu/drm/i915/i915_utils.c index 29fd02bf5ea8c..6f9e7b354b544 100644 --- a/drivers/gpu/drm/i915/i915_utils.c +++ b/drivers/gpu/drm/i915/i915_utils.c @@ -8,6 +8,7 @@ #include #include "i915_drv.h" +#include "i915_reg.h" #include "i915_utils.h" #define FDO_BUG_MSG "Please file a bug on drm/i915; see " FDO_BUG_URL " for details." @@ -125,3 +126,19 @@ bool i915_vtd_active(struct drm_i915_private *i915) /* Running as a guest, we assume the host is enforcing VT'd */ return i915_run_as_guest(); } + +bool i915_direct_stolen_access(struct drm_i915_private *i915) +{ + /* + * Wa_22018444074 + * + * Access via BAR can hang MTL, go directly to GSM/DSM, + * except for VM guests which won't have access to it. + * + * Normally this would not work but on MTL the system firmware + * should have relaxed the access permissions sufficiently. + * 0x138914==0x1 indicates that the firmware has done its job. + */ + return IS_METEORLAKE(i915) && !i915_run_as_guest() && + intel_uncore_read(&i915->uncore, MTL_PCODE_STOLEN_ACCESS) == STOLEN_ACCESS_ALLOWED; +} diff --git a/drivers/gpu/drm/i915/i915_utils.h b/drivers/gpu/drm/i915/i915_utils.h index f98577967b7fc..b45ef0560611a 100644 --- a/drivers/gpu/drm/i915/i915_utils.h +++ b/drivers/gpu/drm/i915/i915_utils.h @@ -391,4 +391,6 @@ static inline bool i915_run_as_guest(void) bool i915_vtd_active(struct drm_i915_private *i915); +bool i915_direct_stolen_access(struct drm_i915_private *i915); + #endif /* !__I915_UTILS_H */ -- 2.30.2