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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Pei Zhang <pei.zhang@intel.com>
Date: Fri, 14 Sep 2018 16:10:19 +0800
Subject: [PATCH] drm/i915: implement pvmmio in guest i915
If pvmmio is enabled in i915 host driver, guest i915 will read most MMIO
register directly, which won't be trapped to host GVT. A small range
MMIOs still need trap. They are filtered in a static function. This patch
is to implement the pvmmio in guest i915 driver.
Also, for the elsp port writting, we will optimize it to leverage pvmmio.
Notice: this patch is required in GVTg guest.
Change-Id: I8d51430015822976450c14085979460b9cc021d7
Signed-off-by: Pei Zhang <pei.zhang@intel.com>
Acknowledged-by: Singh, Satyeshwar <satyeshwar.singh@intel.com>
Reviewed-on:
Reviewed-by: He, Min <min.he@intel.com>
Reviewed-by: Jiang, Fei <fei.jiang@intel.com>
Reviewed-by: Dong, Eddie <eddie.dong@intel.com>
Tested-by: Dong, Eddie <eddie.dong@intel.com>
---
drivers/gpu/drm/i915/i915_drv.c | 1 +
drivers/gpu/drm/i915/i915_drv.h | 10 ++++++++--
drivers/gpu/drm/i915/i915_pvinfo.h | 12 ++++++++++++
drivers/gpu/drm/i915/i915_reg.h | 27 +++++++++++++++++++++++++++
drivers/gpu/drm/i915/intel_lrc.c | 21 ++++++++++++++++++++-
5 files changed, 68 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index acc3be5..06b7861 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -896,6 +896,7 @@ static int i915_driver_init_early(struct drm_i915_private *dev_priv,
sizeof(device_info->platform_mask) * BITS_PER_BYTE);
BUG_ON(device_info->gen > sizeof(device_info->gen_mask) * BITS_PER_BYTE);
spin_lock_init(&dev_priv->irq_lock);
+ spin_lock_init(&dev_priv->shared_page_lock);
spin_lock_init(&dev_priv->gpu_error.lock);
mutex_init(&dev_priv->backlight_lock);
spin_lock_init(&dev_priv->uncore.lock);
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 02b4471..7ac61af 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -55,6 +55,7 @@
#include "i915_params.h"
#include "i915_reg.h"
+#include "i915_pvinfo.h"
#include "i915_utils.h"
#include "intel_bios.h"
@@ -1591,6 +1592,7 @@ struct drm_i915_private {
void __iomem *regs;
struct gvt_shared_page *shared_page;
+ spinlock_t shared_page_lock;
struct intel_uncore uncore;
@@ -2786,7 +2788,7 @@ static inline bool intel_gvt_active(struct drm_i915_private *dev_priv)
return dev_priv->gvt;
}
-static inline bool intel_vgpu_active(struct drm_i915_private *dev_priv)
+static inline bool intel_vgpu_active(const struct drm_i915_private *dev_priv)
{
return dev_priv->vgpu.active;
}
@@ -3586,7 +3588,11 @@ static inline u64 intel_rc6_residency_us(struct drm_i915_private *dev_priv,
static inline uint##x##_t __raw_i915_read##x(const struct drm_i915_private *dev_priv, \
i915_reg_t reg) \
{ \
- return read##s(dev_priv->regs + i915_mmio_reg_offset(reg)); \
+ if (!intel_vgpu_active(dev_priv) || !i915_modparams.enable_pvmmio || \
+ likely(!in_mmio_read_trap_list((reg).reg))) \
+ return read##s(dev_priv->regs + i915_mmio_reg_offset(reg)); \
+ dev_priv->shared_page->reg_addr = i915_mmio_reg_offset(reg); \
+ return read##s(dev_priv->regs + i915_mmio_reg_offset(vgtif_reg(pv_mmio))); \
}
#define __raw_write(x, s) \
diff --git a/drivers/gpu/drm/i915/i915_pvinfo.h b/drivers/gpu/drm/i915/i915_pvinfo.h
index d1a3e3e..c1089bd 100644
--- a/drivers/gpu/drm/i915/i915_pvinfo.h
+++ b/drivers/gpu/drm/i915/i915_pvinfo.h
@@ -49,6 +49,15 @@ enum vgt_g2v_type {
VGT_G2V_MAX,
};
+/* shared page(4KB) between gvt and VM, located at the first page next
+ * to MMIO region(2MB size normally).
+ */
+struct gvt_shared_page {
+ u32 elsp_data[4];
+ u32 reg_addr;
+ u32 rsvd2[0x400 - 5];
+};
+
#define VGPU_PVMMIO(vgpu) vgpu_vreg_t(vgpu, vgtif_reg(enable_pvmmio))
/*
@@ -65,6 +74,9 @@ enum pvmmio_levels {
#define VGT_CAPS_HWSP_EMULATION BIT(3)
#define VGT_CAPS_HUGE_GTT BIT(4)
+#define PVMMIO_LEVEL(dev_priv, level) \
+ (intel_vgpu_active(dev_priv) && (i915_modparams.enable_pvmmio & level))
+
struct vgt_if {
u64 magic; /* VGT_MAGIC */
u16 version_major;
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 5b544cb..00b5e45 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -10656,4 +10656,31 @@ enum skl_power_gate {
_ICL_DSC1_RC_BUF_THRESH_1_UDW_PB, \
_ICL_DSC1_RC_BUF_THRESH_1_UDW_PC)
+/* GVT has special read process from some MMIO register,
+ * which so that should be trapped to GVT to make a
+ * complete emulation. Such MMIO is not too much, now using
+ * a static list to cover them.
+ */
+static inline bool in_mmio_read_trap_list(u32 reg)
+{
+ if (unlikely(reg >= PCH_GMBUS0.reg && reg <= PCH_GMBUS5.reg))
+ return true;
+
+ if (unlikely(reg == RING_TIMESTAMP(RENDER_RING_BASE).reg ||
+ reg == RING_TIMESTAMP(BLT_RING_BASE).reg ||
+ reg == RING_TIMESTAMP(GEN6_BSD_RING_BASE).reg ||
+ reg == RING_TIMESTAMP(VEBOX_RING_BASE).reg ||
+ reg == RING_TIMESTAMP(GEN8_BSD2_RING_BASE).reg ||
+ reg == RING_TIMESTAMP_UDW(RENDER_RING_BASE).reg ||
+ reg == RING_TIMESTAMP_UDW(BLT_RING_BASE).reg ||
+ reg == RING_TIMESTAMP_UDW(GEN6_BSD_RING_BASE).reg ||
+ reg == RING_TIMESTAMP_UDW(VEBOX_RING_BASE).reg))
+ return true;
+
+ if (unlikely(reg == SBI_DATA.reg || reg == 0x6c060 || reg == 0x206c))
+ return true;
+
+ return false;
+}
+
#endif /* _I915_REG_H_ */
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index c858627..929714a 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -468,6 +468,8 @@ static void execlists_submit_ports(struct intel_engine_cs *engine)
struct intel_engine_execlists *execlists = &engine->execlists;
struct execlist_port *port = execlists->port;
unsigned int n;
+ u32 descs[4];
+ int i = 0;
/*
* We can skip acquiring intel_runtime_pm_get() here as it was taken
@@ -510,10 +512,27 @@ static void execlists_submit_ports(struct intel_engine_cs *engine)
GEM_BUG_ON(!n);
desc = 0;
}
+ if (intel_vgpu_active(engine->i915) &&
+ PVMMIO_LEVEL(engine->i915, PVMMIO_ELSP_SUBMIT)) {
+ BUG_ON(i >= 4);
+ descs[i] = upper_32_bits(desc);
+ descs[i + 1] = lower_32_bits(desc);
+ i += 2;
+ continue;
+ }
write_desc(execlists, desc, n);
}
-
+ if (intel_vgpu_active(engine->i915) &&
+ PVMMIO_LEVEL(engine->i915, PVMMIO_ELSP_SUBMIT)) {
+ u32 __iomem *elsp_data = engine->i915->shared_page->elsp_data;
+ spin_lock(&engine->i915->shared_page_lock);
+ writel(descs[0], elsp_data);
+ writel(descs[1], elsp_data + 1);
+ writel(descs[2], elsp_data + 2);
+ writel(descs[3], execlists->submit_reg);
+ spin_unlock(&engine->i915->shared_page_lock);
+ }
/* we need to manually load the submit queue */
if (execlists->ctrl_reg)
writel(EL_CTRL_LOAD, execlists->ctrl_reg);
--
2.21.0
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