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In most cases we also need usable PCI GFXMEM BAR 2. Let's add functions to check if BARs are set, and that it have a size greater than 0. In case GTTMMADDR BAR, let's validate at the beginning of i915 initialization. For other BARs, let's validate before first use. Signed-off-by: Piotr Piórkowski Cc: Jani Nikula Cc: Lucas De Marchi Cc: Matt Roper Reviewed-by: Jani Nikula --- drivers/gpu/drm/i915/gem/i915_gem_stolen.c | 4 ++++ drivers/gpu/drm/i915/gt/intel_ggtt.c | 7 ++++++ drivers/gpu/drm/i915/gt/intel_region_lmem.c | 4 ++++ drivers/gpu/drm/i915/i915_pci.c | 25 +++++++++++++++++++++ drivers/gpu/drm/i915/i915_pci.h | 6 +++++ 5 files changed, 46 insertions(+) diff --git a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c index c369cfd185bc..4f4c9461a23b 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c @@ -18,6 +18,7 @@ #include "gt/intel_region_lmem.h" #include "i915_drv.h" #include "i915_gem_stolen.h" +#include "i915_pci.h" #include "i915_reg.h" #include "i915_utils.h" #include "i915_vgpu.h" @@ -828,6 +829,9 @@ i915_gem_stolen_lmem_setup(struct drm_i915_private *i915, u16 type, if (WARN_ON_ONCE(instance)) return ERR_PTR(-ENODEV); + if (!i915_pci_resource_valid(pdev, GEN12_LMEM_BAR)) + return ERR_PTR(-ENXIO); + /* Use DSM base address instead for stolen memory */ dsm_base = intel_uncore_read64(uncore, GEN12_DSMBASE); if (IS_DG1(uncore->i915)) { diff --git a/drivers/gpu/drm/i915/gt/intel_ggtt.c b/drivers/gpu/drm/i915/gt/intel_ggtt.c index 8214e07a0f5b..30cf5c3369d9 100644 --- a/drivers/gpu/drm/i915/gt/intel_ggtt.c +++ b/drivers/gpu/drm/i915/gt/intel_ggtt.c @@ -18,6 +18,7 @@ #include "intel_gt_regs.h" #include "intel_pci_config.h" #include "i915_drv.h" +#include "i915_pci.h" #include "i915_scatterlist.h" #include "i915_utils.h" #include "i915_vgpu.h" @@ -931,6 +932,9 @@ static int gen8_gmch_probe(struct i915_ggtt *ggtt) u16 snb_gmch_ctl; if (!HAS_LMEM(i915)) { + if (!i915_pci_resource_valid(pdev, GTT_APERTURE_BAR)) + return -ENXIO; + ggtt->gmadr = pci_resource(pdev, GTT_APERTURE_BAR); ggtt->mappable_end = resource_size(&ggtt->gmadr); } @@ -1085,6 +1089,9 @@ static int gen6_gmch_probe(struct i915_ggtt *ggtt) unsigned int size; u16 snb_gmch_ctl; + if (!i915_pci_resource_valid(pdev, GTT_APERTURE_BAR)) + return -ENXIO; + ggtt->gmadr = pci_resource(pdev, GTT_APERTURE_BAR); ggtt->mappable_end = resource_size(&ggtt->gmadr); diff --git a/drivers/gpu/drm/i915/gt/intel_region_lmem.c b/drivers/gpu/drm/i915/gt/intel_region_lmem.c index 1e79d3c8b126..f3ad93db0b21 100644 --- a/drivers/gpu/drm/i915/gt/intel_region_lmem.c +++ b/drivers/gpu/drm/i915/gt/intel_region_lmem.c @@ -4,6 +4,7 @@ */ #include "i915_drv.h" +#include "i915_pci.h" #include "i915_reg.h" #include "intel_memory_region.h" #include "intel_pci_config.h" @@ -201,6 +202,9 @@ static struct intel_memory_region *setup_lmem(struct intel_gt *gt) if (!IS_DGFX(i915)) return ERR_PTR(-ENODEV); + if (!i915_pci_resource_valid(pdev, GEN12_LMEM_BAR)) + return ERR_PTR(-ENXIO); + if (HAS_FLAT_CCS(i915)) { resource_size_t lmem_range; u64 tile_stolen, flat_ccs_base; diff --git a/drivers/gpu/drm/i915/i915_pci.c b/drivers/gpu/drm/i915/i915_pci.c index aacc10f2e73f..9fd788e147a3 100644 --- a/drivers/gpu/drm/i915/i915_pci.c +++ b/drivers/gpu/drm/i915/i915_pci.c @@ -30,6 +30,7 @@ #include "i915_drv.h" #include "i915_pci.h" #include "i915_reg.h" +#include "intel_pci_config.h" #define PLATFORM(x) .platform = (x) #define GEN(x) \ @@ -1262,6 +1263,27 @@ static bool force_probe(u16 device_id, const char *devices) return ret; } +bool i915_pci_resource_valid(struct pci_dev *pdev, int bar) +{ + if (!pci_resource_flags(pdev, bar)) + return false; + + if (pci_resource_flags(pdev, bar) & IORESOURCE_UNSET) + return false; + + if (!pci_resource_len(pdev, bar)) + return false; + + return true; +} + +static bool intel_mmio_bar_valid(struct pci_dev *pdev, struct intel_device_info *intel_info) +{ + int gttmmaddr_bar = intel_info->graphics.ver == 2 ? GEN2_GTTMMADR_BAR : GTTMMADR_BAR; + + return i915_pci_resource_valid(pdev, gttmmaddr_bar); +} + static int i915_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent) { struct intel_device_info *intel_info = @@ -1287,6 +1309,9 @@ static int i915_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent) if (PCI_FUNC(pdev->devfn)) return -ENODEV; + if (!intel_mmio_bar_valid(pdev, intel_info)) + return -ENXIO; + /* Detect if we need to wait for other drivers early on */ if (intel_modeset_probe_defer(pdev)) return -EPROBE_DEFER; diff --git a/drivers/gpu/drm/i915/i915_pci.h b/drivers/gpu/drm/i915/i915_pci.h index ee048c238174..8dfe19f9a775 100644 --- a/drivers/gpu/drm/i915/i915_pci.h +++ b/drivers/gpu/drm/i915/i915_pci.h @@ -6,7 +6,13 @@ #ifndef __I915_PCI_H__ #define __I915_PCI_H__ +#include + +struct pci_dev; + int i915_pci_register_driver(void); void i915_pci_unregister_driver(void); +bool i915_pci_resource_valid(struct pci_dev *pdev, int bar); + #endif /* __I915_PCI_H__ */