From: Piotr Piórkowski <piotr.piorkowski@xxxxxxxxx>
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@xxxxxxxxx>
Cc: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>
Cc: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
Cc: Matt Roper <matthew.d.roper@xxxxxxxxx>
---
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 | 4 ++++
5 files changed, 44 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 0b78a5f3a996..360b11fd57bb 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"
@@ -197,6 +198,9 @@ 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..c0bda6aae806 100644
--- a/drivers/gpu/drm/i915/i915_pci.h
+++ b/drivers/gpu/drm/i915/i915_pci.h
@@ -6,7 +6,11 @@
#ifndef __I915_PCI_H__
#define __I915_PCI_H__
+#include <linux/pci.h>
+
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__ */
--
2.25.1
