amdgpu: fix asic initialization for virtualized environments (v2)

When executing in a PCI passthrough based virtuzliation environemnt, the
hypervisor will usually attempt to send a PCIe bus reset signal to the
ASIC when the VM reboots. In this scenario, the card is not correctly
initialized, but we still consider it to be posted. Therefore, in a
passthrough based environemnt we should always post the card to guarantee
it is in a good state for driver initialization.

However, if we are operating in SR-IOV mode it is up to the GIM driver
to manage the asic state, therefore we should not post the card (and
shouldn't be able to do it either).

v2: add missing semi-colon

Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Andres Rodriguez <andres.rodriguez@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

4 files changed, 45 insertions, 1 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index 01c36b8d6222..70af26d97d28 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -1822,6 +1822,8 @@ struct amdgpu_asic_funcs {
         /* MM block clocks */
         int (*set_uvd_clocks)(struct amdgpu_device *adev, u32 vclk, u32 dclk);
         int (*set_vce_clocks)(struct amdgpu_device *adev, u32 evclk, u32 ecclk);
+        /* query virtual capabilities */
+        u32 (*get_virtual_caps)(struct amdgpu_device *adev);
 };
 
 /*
@@ -1916,8 +1918,12 @@ void amdgpu_cgs_destroy_device(struct cgs_device *cgs_device);
 
 
 /* GPU virtualization */
+#define AMDGPU_VIRT_CAPS_SRIOV_EN       (1 << 0)
+#define AMDGPU_VIRT_CAPS_IS_VF          (1 << 1)
 struct amdgpu_virtualization {
         bool supports_sr_iov;
+        bool is_virtual;
+        u32 caps;
 };
 
 /*
@@ -2206,6 +2212,7 @@ amdgpu_get_sdma_instance(struct amdgpu_ring *ring)
 #define amdgpu_asic_get_xclk(adev) (adev)->asic_funcs->get_xclk((adev))
 #define amdgpu_asic_set_uvd_clocks(adev, v, d) (adev)->asic_funcs->set_uvd_clocks((adev), (v), (d))
 #define amdgpu_asic_set_vce_clocks(adev, ev, ec) (adev)->asic_funcs->set_vce_clocks((adev), (ev), (ec))
+#define amdgpu_asic_get_virtual_caps(adev) ((adev)->asic_funcs->get_virtual_caps((adev)))
 #define amdgpu_asic_get_gpu_clock_counter(adev) (adev)->asic_funcs->get_gpu_clock_counter((adev))
 #define amdgpu_asic_read_disabled_bios(adev) (adev)->asic_funcs->read_disabled_bios((adev))
 #define amdgpu_asic_read_bios_from_rom(adev, b, l) (adev)->asic_funcs->read_bios_from_rom((adev), (b), (l))
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 964f31404f17..66482b429458 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -1385,6 +1385,15 @@ static int amdgpu_resume(struct amdgpu_device *adev)
         return 0;
 }
 
+static bool amdgpu_device_is_virtual(void)
+{
+#ifdef CONFIG_X86
+        return boot_cpu_has(X86_FEATURE_HYPERVISOR);
+#else
+        return false;
+#endif
+}
+
 /**
  * amdgpu_device_init - initialize the driver
  *
@@ -1519,8 +1528,14 @@ int amdgpu_device_init(struct amdgpu_device *adev,
         adev->virtualization.supports_sr_iov =
                 amdgpu_atombios_has_gpu_virtualization_table(adev);
 
+        /* Check if we are executing in a virtualized environment */
+        adev->virtualization.is_virtual = amdgpu_device_is_virtual();
+        adev->virtualization.caps = amdgpu_asic_get_virtual_caps(adev);
+
         /* Post card if necessary */
-        if (!amdgpu_card_posted(adev)) {
+        if (!amdgpu_card_posted(adev) ||
+            (adev->virtualization.is_virtual &&
+             !adev->virtualization.caps & AMDGPU_VIRT_CAPS_SRIOV_EN)) {
                 if (!adev->bios) {
                         dev_err(adev->dev, "Card not posted and no BIOS - ignoring\n");
                         return -EINVAL;
diff --git a/drivers/gpu/drm/amd/amdgpu/cik.c b/drivers/gpu/drm/amd/amdgpu/cik.c
index 07bc795a4ca9..910431808542 100644
--- a/drivers/gpu/drm/amd/amdgpu/cik.c
+++ b/drivers/gpu/drm/amd/amdgpu/cik.c
@@ -962,6 +962,12 @@ static bool cik_read_bios_from_rom(struct amdgpu_device *adev,
         return true;
 }
 
+static u32 cik_get_virtual_caps(struct amdgpu_device *adev)
+{
+        /* CIK does not support SR-IOV */
+        return 0;
+}
+
 static const struct amdgpu_allowed_register_entry cik_allowed_read_registers[] = {
         {mmGRBM_STATUS, false},
         {mmGB_ADDR_CONFIG, false},
@@ -2007,6 +2013,7 @@ static const struct amdgpu_asic_funcs cik_asic_funcs =
         .get_xclk = &cik_get_xclk,
         .set_uvd_clocks = &cik_set_uvd_clocks,
         .set_vce_clocks = &cik_set_vce_clocks,
+        .get_virtual_caps = &cik_get_virtual_caps,
         /* these should be moved to their own ip modules */
         .get_gpu_clock_counter = &gfx_v7_0_get_gpu_clock_counter,
         .wait_for_mc_idle = &gmc_v7_0_mc_wait_for_idle,
diff --git a/drivers/gpu/drm/amd/amdgpu/vi.c b/drivers/gpu/drm/amd/amdgpu/vi.c
index 2c88d0b66cf3..a65c96029476 100644
--- a/drivers/gpu/drm/amd/amdgpu/vi.c
+++ b/drivers/gpu/drm/amd/amdgpu/vi.c
@@ -421,6 +421,20 @@ static bool vi_read_bios_from_rom(struct amdgpu_device *adev,
         return true;
 }
 
+static u32 vi_get_virtual_caps(struct amdgpu_device *adev)
+{
+        u32 caps = 0;
+        u32 reg = RREG32(mmBIF_IOV_FUNC_IDENTIFIER);
+
+        if (REG_GET_FIELD(reg, BIF_IOV_FUNC_IDENTIFIER, IOV_ENABLE))
+                caps |= AMDGPU_VIRT_CAPS_SRIOV_EN;
+
+        if (REG_GET_FIELD(reg, BIF_IOV_FUNC_IDENTIFIER, FUNC_IDENTIFIER))
+                caps |= AMDGPU_VIRT_CAPS_IS_VF;
+
+        return caps;
+}
+
 static const struct amdgpu_allowed_register_entry tonga_allowed_read_registers[] = {
         {mmGB_MACROTILE_MODE7, true},
 };
@@ -1118,6 +1132,7 @@ static const struct amdgpu_asic_funcs vi_asic_funcs =
         .get_xclk = &vi_get_xclk,
         .set_uvd_clocks = &vi_set_uvd_clocks,
         .set_vce_clocks = &vi_set_vce_clocks,
+        .get_virtual_caps = &vi_get_virtual_caps,
         /* these should be moved to their own ip modules */
         .get_gpu_clock_counter = &gfx_v8_0_get_gpu_clock_counter,
         .wait_for_mc_idle = &gmc_v8_0_mc_wait_for_idle,