From: Felix Kuehling <Felix.Kuehling@amd.com>
To: arnd@kernel.org, alexander.deucher@amd.com, christian.koenig@amd.com
Cc: arnd@arndb.de, airlied@linux.ie, linux-kernel@vger.kernel.org,
amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org
Subject: [PATCH 1/1] drm/amdkfd: fix build error with AMD_IOMMU_V2=m
Date: Mon, 8 Mar 2021 22:23:56 -0500 [thread overview]
Message-ID: <20210309032356.20800-1-Felix.Kuehling@amd.com> (raw)
In-Reply-To: <4c692eff-9d57-278e-8da4-36bc2c293506@amd.com>
Using 'imply AMD_IOMMU_V2' does not guarantee that the driver can link
against the exported functions. If the GPU driver is built-in but the
IOMMU driver is a loadable module, the kfd_iommu.c file is indeed
built but does not work:
x86_64-linux-ld: drivers/gpu/drm/amd/amdkfd/kfd_iommu.o: in function `kfd_iommu_bind_process_to_device':
kfd_iommu.c:(.text+0x516): undefined reference to `amd_iommu_bind_pasid'
x86_64-linux-ld: drivers/gpu/drm/amd/amdkfd/kfd_iommu.o: in function `kfd_iommu_unbind_process':
kfd_iommu.c:(.text+0x691): undefined reference to `amd_iommu_unbind_pasid'
x86_64-linux-ld: drivers/gpu/drm/amd/amdkfd/kfd_iommu.o: in function `kfd_iommu_suspend':
kfd_iommu.c:(.text+0x966): undefined reference to `amd_iommu_set_invalidate_ctx_cb'
x86_64-linux-ld: kfd_iommu.c:(.text+0x97f): undefined reference to `amd_iommu_set_invalid_ppr_cb'
x86_64-linux-ld: kfd_iommu.c:(.text+0x9a4): undefined reference to `amd_iommu_free_device'
x86_64-linux-ld: drivers/gpu/drm/amd/amdkfd/kfd_iommu.o: in function `kfd_iommu_resume':
kfd_iommu.c:(.text+0xa9a): undefined reference to `amd_iommu_init_device'
x86_64-linux-ld: kfd_iommu.c:(.text+0xadc): undefined reference to `amd_iommu_set_invalidate_ctx_cb'
x86_64-linux-ld: kfd_iommu.c:(.text+0xaff): undefined reference to `amd_iommu_set_invalid_ppr_cb'
x86_64-linux-ld: kfd_iommu.c:(.text+0xc72): undefined reference to `amd_iommu_bind_pasid'
x86_64-linux-ld: kfd_iommu.c:(.text+0xe08): undefined reference to `amd_iommu_set_invalidate_ctx_cb'
x86_64-linux-ld: kfd_iommu.c:(.text+0xe26): undefined reference to `amd_iommu_set_invalid_ppr_cb'
x86_64-linux-ld: kfd_iommu.c:(.text+0xe42): undefined reference to `amd_iommu_free_device'
Use IS_REACHABLE to only build IOMMU-V2 support if the amd_iommu symbols
are reachable by the amdkfd driver. Output a warning if they are not,
because that may not be what the user was expecting.
Fixes: 64d1c3a43a6f ("drm/amdkfd: Centralize IOMMUv2 code and make it conditional")
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
---
drivers/gpu/drm/amd/amdkfd/kfd_iommu.c | 10 ++++++++++
drivers/gpu/drm/amd/amdkfd/kfd_iommu.h | 6 ++++--
2 files changed, 14 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_iommu.c b/drivers/gpu/drm/amd/amdkfd/kfd_iommu.c
index 66bbca61e3ef..7199eb833f66 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_iommu.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_iommu.c
@@ -20,6 +20,10 @@
* OTHER DEALINGS IN THE SOFTWARE.
*/
+#include <linux/kconfig.h>
+
+#if IS_REACHABLE(CONFIG_AMD_IOMMU_V2)
+
#include <linux/printk.h>
#include <linux/device.h>
#include <linux/slab.h>
@@ -355,3 +359,9 @@ int kfd_iommu_add_perf_counters(struct kfd_topology_device *kdev)
return 0;
}
+
+#else
+
+#warning "Moldular IOMMU-V2 is not usable by built-in KFD"
+
+#endif
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_iommu.h b/drivers/gpu/drm/amd/amdkfd/kfd_iommu.h
index dd23d9fdf6a8..b25365fc2c4e 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_iommu.h
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_iommu.h
@@ -23,7 +23,9 @@
#ifndef __KFD_IOMMU_H__
#define __KFD_IOMMU_H__
-#if defined(CONFIG_AMD_IOMMU_V2_MODULE) || defined(CONFIG_AMD_IOMMU_V2)
+#include <linux/kconfig.h>
+
+#if IS_REACHABLE(CONFIG_AMD_IOMMU_V2)
#define KFD_SUPPORT_IOMMU_V2
@@ -73,6 +75,6 @@ static inline int kfd_iommu_add_perf_counters(struct kfd_topology_device *kdev)
return 0;
}
-#endif /* defined(CONFIG_AMD_IOMMU_V2) */
+#endif /* IS_REACHABLE(CONFIG_AMD_IOMMU_V2) */
#endif /* __KFD_IOMMU_H__ */
--
2.30.0
next prev parent reply other threads:[~2021-03-09 3:26 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-08 20:45 [PATCH] [variant b] drm/amdkfd: fix build error with missing AMD_IOMMU_V2 Arnd Bergmann
2021-03-09 3:20 ` Felix Kuehling
2021-03-09 3:23 ` Felix Kuehling [this message]
2021-03-09 8:58 ` [PATCH 1/1] drm/amdkfd: fix build error with AMD_IOMMU_V2=m Arnd Bergmann
2021-03-09 16:30 ` Felix Kuehling
2021-03-09 17:33 ` Jean-Philippe Brucker
2021-03-09 17:59 ` Alex Deucher
2021-03-09 18:34 ` Christian König
2021-03-11 10:02 ` Arnd Bergmann
2021-03-09 16:50 ` [PATCH v2 " Felix Kuehling
2021-03-10 22:13 ` Felix Kuehling
2021-03-11 8:50 ` Christian König
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