diff options
| author | Piotr Piórkowski <piotr.piorkowski@intel.com> | 2022-08-05 17:59:59 +0200 |
|---|---|---|
| committer | Jani Nikula <jani.nikula@intel.com> | 2022-08-10 13:11:17 +0300 |
| commit | 1bba7323c79b169d855ecb4a1eba410f18a38674 (patch) | |
| tree | 7e3f2175753acb1ec2923b68490b140c0c13fe43 /drivers/gpu/drm/i915/i915_pci.c | |
| parent | 6bba2b30d29cbba78ba0f935210108e74dbe7ab3 (diff) | |
drm/i915: Sanitycheck PCI BARs
For proper operation of i915 we need usable PCI GTTMMADDR BAR 0
(1 for GEN2). 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 <piotr.piorkowski@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220805155959.1983584-3-piotr.piorkowski@intel.com
Diffstat (limited to 'drivers/gpu/drm/i915/i915_pci.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_pci.c | 25 |
1 files changed, 25 insertions, 0 deletions
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; |