drm/amdgpu:changes of virtualization cases probe (v3)

1,Changes on virtualization detections
2,Don't load smu & mc firmware if using sr-iov bios
3,skip vPost for sriov & force vPost if dev pass-through

v2: agd: squash in Rays's fix for the missed SI case
v3: agd: squash in additional fixes for CIK, SI, cleanup

Signed-off-by: Monk Liu <[e-mail]>
Reviewed-by: Alex Deucher <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/amdgpu/amdgpu.h

···
 	bool (*read_disabled_bios)(struct amdgpu_device *adev);
 	bool (*read_bios_from_rom)(struct amdgpu_device *adev,
 				   u8 *bios, u32 length_bytes);
+	void (*detect_hw_virtualization) (struct amdgpu_device *adev);
 	int (*read_register)(struct amdgpu_device *adev, u32 se_num,
 			     u32 sh_num, u32 reg_offset, u32 *value);
 	void (*set_vga_state)(struct amdgpu_device *adev, bool state);
···
 	/* 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);
 	/* static power management */
 	int (*get_pcie_lanes)(struct amdgpu_device *adev);
 	void (*set_pcie_lanes)(struct amdgpu_device *adev, int lanes);
···
 void amdgpu_cgs_destroy_device(struct cgs_device *cgs_device);
 
 
+#define AMDGPU_SRIOV_CAPS_SRIOV_VBIOS  (1 << 0) /* vBIOS is sr-iov ready */
+#define AMDGPU_SRIOV_CAPS_ENABLE_IOV   (1 << 1) /* sr-iov is enabled on this GPU */
+#define AMDGPU_SRIOV_CAPS_IS_VF        (1 << 2) /* this GPU is a virtual function */
+#define AMDGPU_PASSTHROUGH_MODE        (1 << 3) /* thw whole GPU is pass through for VM */
 /* 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;
+	uint32_t virtual_caps;
 };
+
+#define amdgpu_sriov_enabled(adev) \
+((adev)->virtualization.virtual_caps & AMDGPU_SRIOV_CAPS_ENABLE_IOV)
+
+#define amdgpu_sriov_vf(adev) \
+((adev)->virtualization.virtual_caps & AMDGPU_SRIOV_CAPS_IS_VF)
+
+#define amdgpu_sriov_bios(adev) \
+((adev)->virtualization.virtual_caps & AMDGPU_SRIOV_CAPS_SRIOV_VBIOS)
+
+#define amdgpu_passthrough(adev) \
+((adev)->virtualization.virtual_caps & AMDGPU_PASSTHROUGH_MODE)
+
+static inline bool is_virtual_machine(void)
+{
+#ifdef CONFIG_X86
+	return boot_cpu_has(X86_FEATURE_HYPERVISOR);
+#else
+	return false;
+#endif
+}
 
 /*
  * Core structure, functions and helpers.
···
 #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_get_pcie_lanes(adev) (adev)->asic_funcs->get_pcie_lanes((adev))
 #define amdgpu_set_pcie_lanes(adev, l) (adev)->asic_funcs->set_pcie_lanes((adev), (l))
 #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))
+#define amdgpu_asic_detect_hw_virtualization(adev) (adev)->asic_funcs->detect_hw_virtualization((adev))
 #define amdgpu_asic_read_register(adev, se, sh, offset, v)((adev)->asic_funcs->read_register((adev), (se), (sh), (offset), (v)))
 #define amdgpu_gart_flush_gpu_tlb(adev, vmid) (adev)->gart.gart_funcs->flush_gpu_tlb((adev), (vmid))
 #define amdgpu_gart_set_pte_pde(adev, pt, idx, addr, flags) (adev)->gart.gart_funcs->set_pte_pde((adev), (pt), (idx), (addr), (flags))

drivers/gpu/drm/amd/amdgpu/amdgpu_device.c

···
 		    bool always_indirect)
 {
 	trace_amdgpu_mm_wreg(adev->pdev->device, reg, v);
-	
+
 	if ((reg * 4) < adev->rmmio_size && !always_indirect)
 		writel(v, ((void __iomem *)adev->rmmio) + (reg * 4));
 	else {
···
 	return 0;
 }
 
-static bool amdgpu_device_is_virtual(void)
+static void amdgpu_device_detect_sriov_bios(struct amdgpu_device *adev)
 {
-#ifdef CONFIG_X86
-	return boot_cpu_has(X86_FEATURE_HYPERVISOR);
-#else
-	return false;
-#endif
+	if (amdgpu_atombios_has_gpu_virtualization_table(adev))
+		adev->virtualization.virtual_caps |= AMDGPU_SRIOV_CAPS_SRIOV_VBIOS;
 }
 
 /**
···
 		goto failed;
 	}
 
-	/* See if the asic supports SR-IOV */
-	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);
+	/* detect if we are with an SRIOV vbios */
+	amdgpu_device_detect_sriov_bios(adev);
 
 	/* Post card if necessary */
-	if (!amdgpu_card_posted(adev) ||
-	    (adev->virtualization.is_virtual &&
-	     !(adev->virtualization.caps & AMDGPU_VIRT_CAPS_SRIOV_EN))) {
+	if (!amdgpu_sriov_vf(adev) &&
+		(!amdgpu_card_posted(adev) || amdgpu_passthrough(adev))) {
 		if (!adev->bios) {
 			dev_err(adev->dev, "Card not posted and no BIOS - ignoring\n");
 			r = -EINVAL;
 			goto failed;
 		}
 		DRM_INFO("GPU not posted. posting now...\n");
-		amdgpu_atom_asic_init(adev->mode_info.atom_context);
+		r = amdgpu_atom_asic_init(adev->mode_info.atom_context);
+		if (r) {
+			dev_err(adev->dev, "gpu post error!\n");
+			goto failed;
+		}
+	} else {
+		DRM_INFO("GPU post is not needed\n");
 	}
 
 	/* Initialize clocks */

drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c

···
 	/* if we are running in a VM, make sure the device
 	 * torn down properly on reboot/shutdown
 	 */
-	if (adev->virtualization.is_virtual)
+	if (amdgpu_passthrough(adev))
 		amdgpu_pci_remove(pdev);
 }
 

drivers/gpu/drm/amd/amdgpu/cik.c

···
 	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},
···
 {
 	return (RREG32(mmCC_DRM_ID_STRAPS) & CC_DRM_ID_STRAPS__ATI_REV_ID_MASK)
 		>> CC_DRM_ID_STRAPS__ATI_REV_ID__SHIFT;
+}
+
+static void cik_detect_hw_virtualization(struct amdgpu_device *adev)
+{
+	if (is_virtual_machine()) /* passthrough mode */
+		adev->virtualization.virtual_caps |= AMDGPU_PASSTHROUGH_MODE;
 }
 
 static const struct amdgpu_ip_block_version bonaire_ip_blocks[] =
···
 {
 	.read_disabled_bios = &cik_read_disabled_bios,
 	.read_bios_from_rom = &cik_read_bios_from_rom,
+	.detect_hw_virtualization = cik_detect_hw_virtualization,
 	.read_register = &cik_read_register,
 	.reset = &cik_asic_reset,
 	.set_vga_state = &cik_vga_set_state,
 	.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,
 };
 
 static int cik_common_early_init(void *handle)

drivers/gpu/drm/amd/amdgpu/fiji_smc.c

···
 	/* Skip SMC ucode loading on SR-IOV capable boards.
 	 * vbios does this for us in asic_init in that case.
 	 */
-	if (adev->virtualization.supports_sr_iov)
+	if (amdgpu_sriov_bios(adev))
 		return 0;
 
 	hdr = (const struct smc_firmware_header_v1_0 *)adev->pm.fw->data;

drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c

···
 
 	/* Skip MC ucode loading on SR-IOV capable boards.
 	 * vbios does this for us in asic_init in that case.
+	 * Skip MC ucode loading on VF, because hypervisor will do that
+	 * for this adaptor.
 	 */
-	if (adev->virtualization.supports_sr_iov)
+	if (amdgpu_sriov_bios(adev))
 		return 0;
 
 	hdr = (const struct mc_firmware_header_v1_0 *)adev->mc.fw->data;

drivers/gpu/drm/amd/amdgpu/iceland_smc.c

···
 	/* Skip SMC ucode loading on SR-IOV capable boards.
 	 * vbios does this for us in asic_init in that case.
 	 */
-	if (adev->virtualization.supports_sr_iov)
+	if (amdgpu_sriov_bios(adev))
 		return 0;
 
 	hdr = (const struct smc_firmware_header_v1_0 *)adev->pm.fw->data;

drivers/gpu/drm/amd/amdgpu/si.c

···
 	spin_unlock_irqrestore(&adev->smc_idx_lock, flags);
 }
 
-static u32 si_get_virtual_caps(struct amdgpu_device *adev)
-{
-	/* SI does not support SR-IOV */
-	return 0;
-}
-
 static struct amdgpu_allowed_register_entry si_allowed_read_registers[] = {
 	{GRBM_STATUS, false},
 	{GB_ADDR_CONFIG, false},
···
 	return 0;
 }
 
+static void si_detect_hw_virtualization(struct amdgpu_device *adev)
+{
+	if (is_virtual_machine()) /* passthrough mode */
+		adev->virtualization.virtual_caps |= AMDGPU_PASSTHROUGH_MODE;
+}
+
 static const struct amdgpu_asic_funcs si_asic_funcs =
 {
 	.read_disabled_bios = &si_read_disabled_bios,
+	.detect_hw_virtualization = si_detect_hw_virtualization,
 	.read_register = &si_read_register,
 	.reset = &si_asic_reset,
 	.set_vga_state = &si_vga_set_state,
 	.get_xclk = &si_get_xclk,
 	.set_uvd_clocks = &si_set_uvd_clocks,
 	.set_vce_clocks = NULL,
-	.get_virtual_caps = &si_get_virtual_caps,
 };
 
 static uint32_t si_get_rev_id(struct amdgpu_device *adev)

drivers/gpu/drm/amd/amdgpu/tonga_smc.c

···
 	/* Skip SMC ucode loading on SR-IOV capable boards.
 	 * vbios does this for us in asic_init in that case.
 	 */
-	if (adev->virtualization.supports_sr_iov)
+	if (amdgpu_sriov_bios(adev))
 		return 0;
 
 	hdr = (const struct smc_firmware_header_v1_0 *)adev->pm.fw->data;

drivers/gpu/drm/amd/amdgpu/vi.c

···
 	return true;
 }
 
-static u32 vi_get_virtual_caps(struct amdgpu_device *adev)
+static void vi_detect_hw_virtualization(struct amdgpu_device *adev)
 {
-	u32 caps = 0;
-	u32 reg = RREG32(mmBIF_IOV_FUNC_IDENTIFIER);
+	uint32_t reg = RREG32(mmBIF_IOV_FUNC_IDENTIFIER);
+	/* bit0: 0 means pf and 1 means vf */
+	/* bit31: 0 means disable IOV and 1 means enable */
+	if (reg & 1)
+		adev->virtualization.virtual_caps |= AMDGPU_SRIOV_CAPS_IS_VF;
 
-	if (REG_GET_FIELD(reg, BIF_IOV_FUNC_IDENTIFIER, IOV_ENABLE))
-		caps |= AMDGPU_VIRT_CAPS_SRIOV_EN;
+	if (reg & 0x80000000)
+		adev->virtualization.virtual_caps |= AMDGPU_SRIOV_CAPS_ENABLE_IOV;
 
-	if (REG_GET_FIELD(reg, BIF_IOV_FUNC_IDENTIFIER, FUNC_IDENTIFIER))
-		caps |= AMDGPU_VIRT_CAPS_IS_VF;
-
-	return caps;
+	if (reg == 0) {
+		if (is_virtual_machine()) /* passthrough mode exclus sr-iov mode */
+			adev->virtualization.virtual_caps |= AMDGPU_PASSTHROUGH_MODE;
+	}
 }
 
 static const struct amdgpu_allowed_register_entry tonga_allowed_read_registers[] = {
···
 {
 	.read_disabled_bios = &vi_read_disabled_bios,
 	.read_bios_from_rom = &vi_read_bios_from_rom,
+	.detect_hw_virtualization = vi_detect_hw_virtualization,
 	.read_register = &vi_read_register,
 	.reset = &vi_asic_reset,
 	.set_vga_state = &vi_vga_set_state,
 	.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,
 };
 
 static int vi_common_early_init(void *handle)
···
 		/* FIXME: not supported yet */
 		return -EINVAL;
 	}
+
+	/* in early init stage, vbios code won't work */
+	if (adev->asic_funcs->detect_hw_virtualization)
+		amdgpu_asic_detect_hw_virtualization(adev);
 
 	if (amdgpu_smc_load_fw && smc_enabled)
 		adev->firmware.smu_load = true;