[Intel-gfx] [v1.1 01/23] drm/i915: Read graphics/media/display arch version from hw
Jani Nikula
jani.nikula at linux.intel.com
Wed Aug 10 13:23:18 UTC 2022
On Wed, 10 Aug 2022, Jani Nikula <jani.nikula at linux.intel.com> wrote:
> On Wed, 27 Jul 2022, Radhakrishna Sripada <radhakrishna.sripada at intel.com> wrote:
>> From: Matt Roper <matthew.d.roper at intel.com>
>>
>> Going forward, the hardware teams no longer consider new platforms to
>> have a "generation" in the way we've defined it for past platforms.
>> Instead, each IP block (graphics, media, display) will have their own
>> architecture major.minor versions and stepping ID's which should be read
>> directly from a register in the MMIO space. New hardware programming
>> styles, features, and workarounds should be conditional solely on the
>> architecture version, and should no longer be derived from the PCI
>> device ID, revision ID, or platform-specific feature flags.
>
> This patch does too many things at once.
>
> The first patch should be [1], which makes moving info between
> intel_device_info and intel_runtime_info easier.
>
> The next patch should move the version. I've actually got that one too,
> but in a way that takes the initial version from __runtime, see [2] and
> [3].
>
> And the final one should be about actually reading it from hardware.
>
> I've rebased my series, I'll repost it.
https://patchwork.freedesktop.org/series/105358/
I've reorder v2 so that the first three patches are enough dependencies
for reworking this patch.
BR,
Jani.
>
> Further comments inline.
>
>
> [1] https://patchwork.freedesktop.org/patch/msgid/6b305ceebd1a0a36f3d08c1e21582b186debcb7a.1655712106.git.jani.nikula@intel.com
>
> [2] https://patchwork.freedesktop.org/patch/msgid/1037cd2faeb2ad28be07dcb07afd4ec80a80e7a4.1655712106.git.jani.nikula@intel.com
>
> [3] https://patchwork.freedesktop.org/patch/msgid/b5b0abf35bb84c222d3dbc15eb03ada886447ed8.1655712106.git.jani.nikula@intel.com
>
>
>>
>> v1.1: Fix build error
>>
>> Bspec: 63361, 64111
>>
>> Signed-off-by: Matt Roper <matthew.d.roper at intel.com>
>> Signed-off-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
>> ---
>> drivers/gpu/drm/i915/gt/intel_gt_regs.h | 2 +
>> drivers/gpu/drm/i915/i915_driver.c | 80 ++++++++++++++++++-
>> drivers/gpu/drm/i915/i915_drv.h | 16 ++--
>> drivers/gpu/drm/i915/i915_pci.c | 1 +
>> drivers/gpu/drm/i915/i915_reg.h | 6 ++
>> drivers/gpu/drm/i915/intel_device_info.c | 32 ++++----
>> drivers/gpu/drm/i915/intel_device_info.h | 14 ++++
>> .../gpu/drm/i915/selftests/mock_gem_device.c | 1 +
>> 8 files changed, 128 insertions(+), 24 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i915/gt/intel_gt_regs.h b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
>> index 60d6eb5f245b..fab8e4ff74d5 100644
>> --- a/drivers/gpu/drm/i915/gt/intel_gt_regs.h
>> +++ b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
>> @@ -39,6 +39,8 @@
>> #define FORCEWAKE_ACK_RENDER_GEN9 _MMIO(0xd84)
>> #define FORCEWAKE_ACK_MEDIA_GEN9 _MMIO(0xd88)
>>
>> +#define GMD_ID_GRAPHICS _MMIO(0xd8c)
>> +
>> #define MCFG_MCR_SELECTOR _MMIO(0xfd0)
>> #define SF_MCR_SELECTOR _MMIO(0xfd8)
>> #define GEN8_MCR_SELECTOR _MMIO(0xfdc)
>> diff --git a/drivers/gpu/drm/i915/i915_driver.c b/drivers/gpu/drm/i915/i915_driver.c
>> index deb8a8b76965..33566f6e9546 100644
>> --- a/drivers/gpu/drm/i915/i915_driver.c
>> +++ b/drivers/gpu/drm/i915/i915_driver.c
>> @@ -70,6 +70,7 @@
>> #include "gem/i915_gem_pm.h"
>> #include "gt/intel_gt.h"
>> #include "gt/intel_gt_pm.h"
>> +#include "gt/intel_gt_regs.h"
>> #include "gt/intel_rc6.h"
>>
>> #include "pxp/intel_pxp_pm.h"
>> @@ -306,15 +307,83 @@ static void sanitize_gpu(struct drm_i915_private *i915)
>> __intel_gt_reset(to_gt(i915), ALL_ENGINES);
>> }
>>
>> +#define IP_VER_READ(offset, ri_prefix) \
>> + addr = pci_iomap_range(pdev, 0, offset, sizeof(u32)); \
>> + if (drm_WARN_ON(&i915->drm, !addr)) { \
>> + /* Fall back to whatever was in the device info */ \
>> + RUNTIME_INFO(i915)->ri_prefix.ver = INTEL_INFO(i915)->ri_prefix.ver; \
>> + RUNTIME_INFO(i915)->ri_prefix.rel = INTEL_INFO(i915)->ri_prefix.rel; \
>> + goto ri_prefix##done; \
>> + } \
>> + \
>> + ver = ioread32(addr); \
>> + pci_iounmap(pdev, addr); \
>> + \
>> + RUNTIME_INFO(i915)->ri_prefix.ver = REG_FIELD_GET(GMD_ID_ARCH_MASK, ver); \
>> + RUNTIME_INFO(i915)->ri_prefix.rel = REG_FIELD_GET(GMD_ID_RELEASE_MASK, ver); \
>> + RUNTIME_INFO(i915)->ri_prefix.step = REG_FIELD_GET(GMD_ID_STEP, ver); \
>> + \
>> + /* Sanity check against expected versions from device info */ \
>> + if (RUNTIME_INFO(i915)->ri_prefix.ver != INTEL_INFO(i915)->ri_prefix.ver || \
>> + RUNTIME_INFO(i915)->ri_prefix.rel > INTEL_INFO(i915)->ri_prefix.rel) \
>> + drm_dbg(&i915->drm, \
>> + "Hardware reports " #ri_prefix " IP version %u.%u but minimum expected is %u.%u\n", \
>> + RUNTIME_INFO(i915)->ri_prefix.ver, \
>> + RUNTIME_INFO(i915)->ri_prefix.rel, \
>> + INTEL_INFO(i915)->ri_prefix.ver, \
>> + INTEL_INFO(i915)->ri_prefix.rel); \
>> +ri_prefix##done:
>
> Sheesh, can we please not make this a monster macro? You know, you can
> just pass a pointer to the right struct ip_version.
>
> Also, this is way too detailed stuff for this file. i915_driver.c is a
> very high level thing, and shouldn't have any of this hardware
> detail. i915_driver.c calls functions in other places to get low level
> stuff done.
>
> Seems like this should be in intel_device_info.c, where we already have
> a function for initializing the runtime info:
> intel_device_info_runtime_init().
>
> The question is, why is that too late? Do we really need a separate
> step?
>
>> +
>> +/**
>> + * intel_ipver_early_init - setup IP version values
>> + * @dev_priv: device private
>> + *
>> + * Setup the graphics version for the current device. This must be done before
>> + * any code that performs checks on GRAPHICS_VER or DISPLAY_VER, so this
>> + * function should be called very early in the driver initialization sequence.
>> + *
>> + * Regular MMIO access is not yet setup at the point this function is called so
>> + * we peek at the appropriate MMIO offset directly. The GMD_ID register is
>> + * part of an 'always on' power well by design, so we don't need to worry about
>> + * forcewake while reading it.
>> + */
>> +static void intel_ipver_early_init(struct drm_i915_private *i915)
>> +{
>> + struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
>> + void __iomem *addr;
>> + u32 ver;
>> +
>> + if (!HAS_GMD_ID(i915)) {
>> + drm_WARN_ON(&i915->drm, INTEL_INFO(i915)->graphics.ver > 12);
>> +
>> + RUNTIME_INFO(i915)->graphics.ver = INTEL_INFO(i915)->graphics.ver;
>> + RUNTIME_INFO(i915)->graphics.rel = INTEL_INFO(i915)->graphics.rel;
>> + /* media ver = graphics ver for older platforms */
>> + RUNTIME_INFO(i915)->media.ver = INTEL_INFO(i915)->graphics.ver;
>> + RUNTIME_INFO(i915)->media.rel = INTEL_INFO(i915)->graphics.rel;
>> + RUNTIME_INFO(i915)->display.ver = INTEL_INFO(i915)->display.ver;
>> + RUNTIME_INFO(i915)->display.rel = INTEL_INFO(i915)->display.rel;
>> + return;
>> + }
>> +
>> + IP_VER_READ(i915_mmio_reg_offset(GMD_ID_GRAPHICS), graphics);
>> + IP_VER_READ(i915_mmio_reg_offset(GMD_ID_DISPLAY), display);
>> + IP_VER_READ(MTL_MEDIA_GSI_BASE + i915_mmio_reg_offset(GMD_ID_GRAPHICS),
>> + media);
>> +}
>> +
>> /**
>> * i915_driver_early_probe - setup state not requiring device access
>> * @dev_priv: device private
>> + * @ent: PCI device info entry matched
>
> Unrelated change.
>
>> *
>> * Initialize everything that is a "SW-only" state, that is state not
>> * requiring accessing the device or exposing the driver via kernel internal
>> * or userspace interfaces. Example steps belonging here: lock initialization,
>> * system memory allocation, setting up device specific attributes and
>> * function hooks not requiring accessing the device.
>> + *
>> + * GRAPHICS_VER, DISPLAY_VER, etc. are not yet usable at this point. For
>
> Seems odd to mention them here, because *none* of the runtime info is
> usable before it's initialized.
>
>> */
>> static int i915_driver_early_probe(struct drm_i915_private *dev_priv)
>> {
>> @@ -855,13 +924,22 @@ int i915_driver_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
>> return PTR_ERR(i915);
>>
>> /* Disable nuclear pageflip by default on pre-ILK */
>> - if (!i915->params.nuclear_pageflip && DISPLAY_VER(i915) < 5)
>> + if (!i915->params.nuclear_pageflip &&
>> + !HAS_GMD_ID(i915) && DISPLAY_VER(i915) < 5)
>
> If you look at my series, the patches I reference above, this would work
> fine without changes, even if the info gets updated from hardware later
> in intel_device_info_runtime_init().
>
>> i915->drm.driver_features &= ~DRIVER_ATOMIC;
>>
>> ret = pci_enable_device(pdev);
>> if (ret)
>> goto out_fini;
>>
>> + /*
>> + * GRAPHICS_VER() and DISPLAY_VER() will return 0 before this is
>> + * called, so we want to take care of this very early in the
>> + * initialization process (as soon as we can peek into the MMIO BAR),
>> + * even before we setup regular MMIO access.
>> + */
>> + intel_ipver_early_init(i915);
>> +
>
> Again, if we really need that as a separate step, it needs to be in
> intel_device_info.c.
>
>> ret = i915_driver_early_probe(i915);
>> if (ret < 0)
>> goto out_pci_disable;
>> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
>> index d25647be25d1..5767bbba2260 100644
>> --- a/drivers/gpu/drm/i915/i915_drv.h
>> +++ b/drivers/gpu/drm/i915/i915_drv.h
>> @@ -856,19 +856,19 @@ static inline struct intel_gt *to_gt(struct drm_i915_private *i915)
>>
>> #define IP_VER(ver, rel) ((ver) << 8 | (rel))
>>
>> -#define GRAPHICS_VER(i915) (INTEL_INFO(i915)->graphics.ver)
>> -#define GRAPHICS_VER_FULL(i915) IP_VER(INTEL_INFO(i915)->graphics.ver, \
>> - INTEL_INFO(i915)->graphics.rel)
>> +#define GRAPHICS_VER(i915) (RUNTIME_INFO(i915)->graphics.ver)
>> +#define GRAPHICS_VER_FULL(i915) IP_VER(RUNTIME_INFO(i915)->graphics.ver, \
>> + RUNTIME_INFO(i915)->graphics.rel)
>> #define IS_GRAPHICS_VER(i915, from, until) \
>> (GRAPHICS_VER(i915) >= (from) && GRAPHICS_VER(i915) <= (until))
>>
>> -#define MEDIA_VER(i915) (INTEL_INFO(i915)->media.ver)
>> -#define MEDIA_VER_FULL(i915) IP_VER(INTEL_INFO(i915)->media.ver, \
>> - INTEL_INFO(i915)->media.rel)
>> +#define MEDIA_VER(i915) (RUNTIME_INFO(i915)->media.ver)
>> +#define MEDIA_VER_FULL(i915) IP_VER(RUNTIME_INFO(i915)->media.ver, \
>> + RUNTIME_INFO(i915)->media.rel)
>> #define IS_MEDIA_VER(i915, from, until) \
>> (MEDIA_VER(i915) >= (from) && MEDIA_VER(i915) <= (until))
>>
>> -#define DISPLAY_VER(i915) (INTEL_INFO(i915)->display.ver)
>> +#define DISPLAY_VER(i915) (RUNTIME_INFO(i915)->display.ver)
>> #define IS_DISPLAY_VER(i915, from, until) \
>> (DISPLAY_VER(i915) >= (from) && DISPLAY_VER(i915) <= (until))
>>
>> @@ -1300,6 +1300,8 @@ IS_SUBPLATFORM(const struct drm_i915_private *i915,
>> */
>> #define NEEDS_COMPACT_PT(dev_priv) (INTEL_INFO(dev_priv)->needs_compact_pt)
>>
>> +#define HAS_GMD_ID(i915) INTEL_INFO(i915)->has_gmd_id
>> +
>> #define HAS_IPC(dev_priv) (INTEL_INFO(dev_priv)->display.has_ipc)
>>
>> #define HAS_REGION(i915, i) (INTEL_INFO(i915)->memory_regions & (i))
>> diff --git a/drivers/gpu/drm/i915/i915_pci.c b/drivers/gpu/drm/i915/i915_pci.c
>> index aacc10f2e73f..884f27b3a2b3 100644
>> --- a/drivers/gpu/drm/i915/i915_pci.c
>> +++ b/drivers/gpu/drm/i915/i915_pci.c
>> @@ -1126,6 +1126,7 @@ static const struct intel_device_info mtl_info = {
>> PLATFORM(INTEL_METEORLAKE),
>> .display.has_modular_fia = 1,
>> .has_flat_ccs = 0,
>> + .has_gmd_id = 1,
>> .has_snoop = 1,
>> .memory_regions = REGION_SMEM | REGION_STOLEN_LMEM,
>> .platform_engine_mask = BIT(RCS0) | BIT(BCS0) | BIT(CCS0),
>> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
>> index 3168d7007e10..50ddc5ba72b9 100644
>> --- a/drivers/gpu/drm/i915/i915_reg.h
>> +++ b/drivers/gpu/drm/i915/i915_reg.h
>> @@ -5965,6 +5965,11 @@
>> #define ICL_DSSM_CDCLK_PLL_REFCLK_19_2MHz (1 << 29)
>> #define ICL_DSSM_CDCLK_PLL_REFCLK_38_4MHz (2 << 29)
>>
>> +#define GMD_ID_DISPLAY _MMIO(0x510a0)
>> +#define GMD_ID_ARCH_MASK REG_GENMASK(31, 22)
>> +#define GMD_ID_RELEASE_MASK REG_GENMASK(21, 14)
>> +#define GMD_ID_STEP REG_GENMASK(5, 0)
>> +
>> /*GEN11 chicken */
>> #define _PIPEA_CHICKEN 0x70038
>> #define _PIPEB_CHICKEN 0x71038
>> @@ -8717,4 +8722,5 @@ enum skl_power_gate {
>> #define GEN12_CULLBIT2 _MMIO(0x7030)
>> #define GEN12_STATE_ACK_DEBUG _MMIO(0x20BC)
>>
>> +#define MTL_MEDIA_GSI_BASE 0x380000
>> #endif /* _I915_REG_H_ */
>> diff --git a/drivers/gpu/drm/i915/intel_device_info.c b/drivers/gpu/drm/i915/intel_device_info.c
>> index d98fbbd589aa..4ca8f78bfbd7 100644
>> --- a/drivers/gpu/drm/i915/intel_device_info.c
>> +++ b/drivers/gpu/drm/i915/intel_device_info.c
>> @@ -91,22 +91,6 @@ const char *intel_platform_name(enum intel_platform platform)
>> void intel_device_info_print_static(const struct intel_device_info *info,
>> struct drm_printer *p)
>> {
>> - if (info->graphics.rel)
>> - drm_printf(p, "graphics version: %u.%02u\n", info->graphics.ver,
>> - info->graphics.rel);
>> - else
>> - drm_printf(p, "graphics version: %u\n", info->graphics.ver);
>> -
>> - if (info->media.rel)
>> - drm_printf(p, "media version: %u.%02u\n", info->media.ver, info->media.rel);
>> - else
>> - drm_printf(p, "media version: %u\n", info->media.ver);
>> -
>> - if (info->display.rel)
>> - drm_printf(p, "display version: %u.%02u\n", info->display.ver, info->display.rel);
>> - else
>> - drm_printf(p, "display version: %u\n", info->display.ver);
>> -
>> drm_printf(p, "gt: %d\n", info->gt);
>> drm_printf(p, "memory-regions: %x\n", info->memory_regions);
>> drm_printf(p, "page-sizes: %x\n", info->page_sizes);
>> @@ -127,6 +111,22 @@ void intel_device_info_print_static(const struct intel_device_info *info,
>> void intel_device_info_print_runtime(const struct intel_runtime_info *info,
>> struct drm_printer *p)
>> {
>> + if (info->graphics.rel)
>> + drm_printf(p, "graphics version: %u.%02u\n", info->graphics.ver,
>> + info->graphics.rel);
>> + else
>> + drm_printf(p, "graphics version: %u\n", info->graphics.ver);
>> +
>> + if (info->media.rel)
>> + drm_printf(p, "media version: %u.%02u\n", info->media.ver, info->media.rel);
>> + else
>> + drm_printf(p, "media version: %u\n", info->media.ver);
>> +
>> + if (info->display.rel)
>> + drm_printf(p, "display version: %u.%02u\n", info->display.ver, info->display.rel);
>> + else
>> + drm_printf(p, "display version: %u\n", info->display.ver);
>> +
>> drm_printf(p, "rawclk rate: %u kHz\n", info->rawclk_freq);
>> }
>>
>> diff --git a/drivers/gpu/drm/i915/intel_device_info.h b/drivers/gpu/drm/i915/intel_device_info.h
>> index 23bf230aa104..327e62875871 100644
>> --- a/drivers/gpu/drm/i915/intel_device_info.h
>> +++ b/drivers/gpu/drm/i915/intel_device_info.h
>> @@ -146,6 +146,7 @@ enum intel_ppgtt_type {
>> func(has_64bit_reloc); \
>> func(has_64k_pages); \
>> func(needs_compact_pt); \
>> + func(has_gmd_id); \
>> func(gpu_reset_clobbers_display); \
>> func(has_reset_engine); \
>> func(has_3d_pipeline); \
>> @@ -200,6 +201,7 @@ enum intel_ppgtt_type {
>> struct ip_version {
>> u8 ver;
>> u8 rel;
>> + u8 step;
>> };
>>
>> struct intel_device_info {
>> @@ -271,6 +273,18 @@ struct intel_runtime_info {
>> */
>> u32 platform_mask[2];
>>
>> + /*
>> + * On modern platforms, the architecture major.minor version numbers
>> + * and stepping are read directly from the hardware rather than derived
>> + * from the PCI device and revision ID's.
>> + *
>> + * Note that the hardware gives us a single "graphics" number that
>> + * should represent render, compute, and copy behavior.
>> + */
>> + struct ip_version graphics;
>> + struct ip_version media;
>> + struct ip_version display;
>> +
>> u16 device_id;
>>
>> u8 num_sprites[I915_MAX_PIPES];
>> diff --git a/drivers/gpu/drm/i915/selftests/mock_gem_device.c b/drivers/gpu/drm/i915/selftests/mock_gem_device.c
>> index 9c31a16f8380..91ad444cd532 100644
>> --- a/drivers/gpu/drm/i915/selftests/mock_gem_device.c
>> +++ b/drivers/gpu/drm/i915/selftests/mock_gem_device.c
>> @@ -173,6 +173,7 @@ struct drm_i915_private *mock_gem_device(void)
>> drm_mode_config_init(&i915->drm);
>>
>> mkwrite_device_info(i915)->graphics.ver = -1;
>> + RUNTIME_INFO(i915)->graphics.ver = ~0;
>>
>> mkwrite_device_info(i915)->page_sizes =
>> I915_GTT_PAGE_SIZE_4K |
--
Jani Nikula, Intel Open Source Graphics Center
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