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x86/gpu: reserve ICL's graphics stolen memory

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ICL changes the registers and addresses to 64 bits.

I also briefly looked at implementing an u64 version of the PCI config
read functions, but I concluded this wouldn't be trivial, so it's not
worth doing it for a single user that can't have any racing problems
while reading the register in two separate operations.

v2:
 - Scrub the development (non-public) changelog (Joonas).
 - Remove the i915.ko bits so this can be easily backported in order
   to properly avoid stolen memory even on machines without i915.ko
   (Joonas).
 - CC stable for the reasons above.

Issue: VIZ-9250
CC: stable@vger.kernel.org
Cc: Ingo Molnar <mingo@kernel.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: x86@kernel.org
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Fixes: 412310019a ("drm/i915/icl: Add initial Icelake definitions.")
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180504203252.28048-1-paulo.r.zanoni@intel.com
This commit is contained in:
Paulo Zanoni 2018-05-04 13:32:51 -07:00 committed by Rodrigo Vivi
parent 7ab87ede50
commit db0c8d8b03
2 changed files with 21 additions and 1 deletions
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18
arch/x86/kernel/early-quirks.c
View file

@ -340,6 +340,18 @@ static resource_size_t __init gen3_stolen_base(int num, int slot, int func,
return bsm & INTEL_BSM_MASK;
}
static resource_size_t __init gen11_stolen_base(int num, int slot, int func,
resource_size_t stolen_size)
{
u64 bsm;
bsm = read_pci_config(num, slot, func, INTEL_GEN11_BSM_DW0);
bsm &= INTEL_BSM_MASK;
bsm |= (u64)read_pci_config(num, slot, func, INTEL_GEN11_BSM_DW1) << 32;
return bsm;
}
static resource_size_t __init i830_stolen_size(int num, int slot, int func)
{
u16 gmch_ctrl;
@ -500,6 +512,11 @@ static const struct intel_early_ops chv_early_ops __initconst = {
.stolen_size = chv_stolen_size,
};
static const struct intel_early_ops gen11_early_ops __initconst = {
.stolen_base = gen11_stolen_base,
.stolen_size = gen9_stolen_size,
};
static const struct pci_device_id intel_early_ids[] __initconst = {
INTEL_I830_IDS(&i830_early_ops),
INTEL_I845G_IDS(&i845_early_ops),
@ -531,6 +548,7 @@ static const struct pci_device_id intel_early_ids[] __initconst = {
INTEL_CFL_IDS(&gen9_early_ops),
INTEL_GLK_IDS(&gen9_early_ops),
INTEL_CNL_IDS(&gen9_early_ops),
INTEL_ICL_11_IDS(&gen11_early_ops),
};
struct resource intel_graphics_stolen_res __ro_after_init = DEFINE_RES_MEM(0, 0);

4
include/drm/i915_drm.h
View file

@ -95,7 +95,9 @@ extern struct resource intel_graphics_stolen_res;
#define I845_TSEG_SIZE_512K (2 << 1)
#define I845_TSEG_SIZE_1M (3 << 1)
#define INTEL_BSM 0x5c
#define INTEL_BSM 0x5c
#define INTEL_GEN11_BSM_DW0 0xc0
#define INTEL_GEN11_BSM_DW1 0xc4
#define INTEL_BSM_MASK (-(1u << 20))
#endif /* _I915_DRM_H_ */