linux-kernel - [PATCH 2/7] agp/intel: Use per device iommu check

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Message-Id: <20220514014322.2927339-3-baolu.lu@linux.intel.com>
Date:   Sat, 14 May 2022 09:43:17 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Joerg Roedel <joro@...tes.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        David Airlie <airlied@...ux.ie>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Kevin Tian <kevin.tian@...el.com>,
        Ashok Raj <ashok.raj@...el.com>, Liu Yi L <yi.l.liu@...el.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        Ning Sun <ning.sun@...el.com>
Cc:     Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Christoph Hellwig <hch@....de>,
        Steve Wahl <steve.wahl@....com>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Lu Baolu <baolu.lu@...ux.intel.com>
Subject: [PATCH 2/7] agp/intel: Use per device iommu check

The IOMMU subsystem has already provided an interface to query whether
the IOMMU hardware is enabled for a specific device. This changes the
check from Intel specific intel_iommu_gfx_mapped (globally exported by
the Intel IOMMU driver) to probing the presence of IOMMU on a specific
device using the generic device_iommu_mapped().

This follows commit cca084692394a ("drm/i915: Use per device iommu check")
which converted drm/i915 driver to use device_iommu_mapped().

Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
---
 drivers/char/agp/intel-gtt.c | 17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)

diff --git a/drivers/char/agp/intel-gtt.c b/drivers/char/agp/intel-gtt.c
index 79a1b65527c2..cfcb450e9b59 100644
--- a/drivers/char/agp/intel-gtt.c
+++ b/drivers/char/agp/intel-gtt.c
@@ -20,7 +20,7 @@
 #include <linux/kernel.h>
 #include <linux/pagemap.h>
 #include <linux/agp_backend.h>
-#include <linux/intel-iommu.h>
+#include <linux/iommu.h>
 #include <linux/delay.h>
 #include <asm/smp.h>
 #include "agp.h"
@@ -573,18 +573,15 @@ static void intel_gtt_cleanup(void)
  */
 static inline int needs_ilk_vtd_wa(void)
 {
-#ifdef CONFIG_INTEL_IOMMU
 	const unsigned short gpu_devid = intel_private.pcidev->device;
 
-	/* Query intel_iommu to see if we need the workaround. Presumably that
-	 * was loaded first.
+	/*
+	 * Query iommu subsystem to see if we need the workaround. Presumably
+	 * that was loaded first.
 	 */
-	if ((gpu_devid == PCI_DEVICE_ID_INTEL_IRONLAKE_D_IG ||
-	     gpu_devid == PCI_DEVICE_ID_INTEL_IRONLAKE_M_IG) &&
-	     intel_iommu_gfx_mapped)
-		return 1;
-#endif
-	return 0;
+	return ((gpu_devid == PCI_DEVICE_ID_INTEL_IRONLAKE_D_IG ||
+		 gpu_devid == PCI_DEVICE_ID_INTEL_IRONLAKE_M_IG) &&
+		device_iommu_mapped(&intel_private.pcidev->dev));
 }
 
 static bool intel_gtt_can_wc(void)
-- 
2.25.1