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[PATCH v2 04/12] AMD/IOMMU: add helper to check whether ATS is to be used for a device


  • To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • From: Jan Beulich <jbeulich@xxxxxxxx>
  • Date: Thu, 15 Feb 2024 11:15:12 +0100
  • Autocrypt: addr=jbeulich@xxxxxxxx; keydata= xsDiBFk3nEQRBADAEaSw6zC/EJkiwGPXbWtPxl2xCdSoeepS07jW8UgcHNurfHvUzogEq5xk hu507c3BarVjyWCJOylMNR98Yd8VqD9UfmX0Hb8/BrA+Hl6/DB/eqGptrf4BSRwcZQM32aZK 7Pj2XbGWIUrZrd70x1eAP9QE3P79Y2oLrsCgbZJfEwCgvz9JjGmQqQkRiTVzlZVCJYcyGGsD /0tbFCzD2h20ahe8rC1gbb3K3qk+LpBtvjBu1RY9drYk0NymiGbJWZgab6t1jM7sk2vuf0Py O9Hf9XBmK0uE9IgMaiCpc32XV9oASz6UJebwkX+zF2jG5I1BfnO9g7KlotcA/v5ClMjgo6Gl MDY4HxoSRu3i1cqqSDtVlt+AOVBJBACrZcnHAUSuCXBPy0jOlBhxPqRWv6ND4c9PH1xjQ3NP nxJuMBS8rnNg22uyfAgmBKNLpLgAGVRMZGaGoJObGf72s6TeIqKJo/LtggAS9qAUiuKVnygo 3wjfkS9A3DRO+SpU7JqWdsveeIQyeyEJ/8PTowmSQLakF+3fote9ybzd880fSmFuIEJldWxp Y2ggPGpiZXVsaWNoQHN1c2UuY29tPsJgBBMRAgAgBQJZN5xEAhsDBgsJCAcDAgQVAggDBBYC AwECHgECF4AACgkQoDSui/t3IH4J+wCfQ5jHdEjCRHj23O/5ttg9r9OIruwAn3103WUITZee e7Sbg12UgcQ5lv7SzsFNBFk3nEQQCACCuTjCjFOUdi5Nm244F+78kLghRcin/awv+IrTcIWF hUpSs1Y91iQQ7KItirz5uwCPlwejSJDQJLIS+QtJHaXDXeV6NI0Uef1hP20+y8qydDiVkv6l IreXjTb7DvksRgJNvCkWtYnlS3mYvQ9NzS9PhyALWbXnH6sIJd2O9lKS1Mrfq+y0IXCP10eS FFGg+Av3IQeFatkJAyju0PPthyTqxSI4lZYuJVPknzgaeuJv/2NccrPvmeDg6Coe7ZIeQ8Yj t0ARxu2xytAkkLCel1Lz1WLmwLstV30g80nkgZf/wr+/BXJW/oIvRlonUkxv+IbBM3dX2OV8 AmRv1ySWPTP7AAMFB/9PQK/VtlNUJvg8GXj9ootzrteGfVZVVT4XBJkfwBcpC/XcPzldjv+3 HYudvpdNK3lLujXeA5fLOH+Z/G9WBc5pFVSMocI71I8bT8lIAzreg0WvkWg5V2WZsUMlnDL9 mpwIGFhlbM3gfDMs7MPMu8YQRFVdUvtSpaAs8OFfGQ0ia3LGZcjA6Ik2+xcqscEJzNH+qh8V m5jjp28yZgaqTaRbg3M/+MTbMpicpZuqF4rnB0AQD12/3BNWDR6bmh+EkYSMcEIpQmBM51qM EKYTQGybRCjpnKHGOxG0rfFY1085mBDZCH5Kx0cl0HVJuQKC+dV2ZY5AqjcKwAxpE75MLFkr wkkEGBECAAkFAlk3nEQCGwwACgkQoDSui/t3IH7nnwCfcJWUDUFKdCsBH/E5d+0ZnMQi+G0A nAuWpQkjM1ASeQwSHEeAWPgskBQL
  • Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Paul Durrant <paul@xxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Delivery-date: Thu, 15 Feb 2024 10:15:17 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

The same set of conditions is used in three places, requiring to be kept
in sync. Introduce a helper to centralize these checks.

To allow all parameters of the new helper be pointer-to-const,
iommu_has_cap() also needs its 1st parameter to be constified. Beyond
that further "modernize" that function.

Requested-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
---
v2: New.

--- a/xen/drivers/passthrough/amd/iommu.h
+++ b/xen/drivers/passthrough/amd/iommu.h
@@ -404,9 +404,9 @@ static inline void __free_amd_iommu_tabl
     free_xenheap_pages(table, order);
 }
 
-static inline int iommu_has_cap(struct amd_iommu *iommu, uint32_t bit)
+static inline bool iommu_has_cap(const struct amd_iommu *iommu, unsigned int 
bit)
 {
-    return !!(iommu->cap.header & (1u << bit));
+    return iommu->cap.header & (1u << bit);
 }
 
 /* access device id field from iommu cmd */
--- a/xen/drivers/passthrough/amd/pci_amd_iommu.c
+++ b/xen/drivers/passthrough/amd/pci_amd_iommu.c
@@ -114,6 +114,16 @@ static bool any_pdev_behind_iommu(const
     return false;
 }
 
+static bool use_ats(
+    const struct pci_dev *pdev,
+    const struct amd_iommu *iommu,
+    const struct ivrs_mappings *ivrs_dev)
+{
+    return !ivrs_dev->block_ats &&
+           iommu_has_cap(iommu, PCI_CAP_IOTLB_SHIFT) &&
+           pci_ats_device(iommu->seg, pdev->bus, pdev->devfn);
+}
+
 static int __must_check amd_iommu_setup_domain_device(
     struct domain *domain, struct amd_iommu *iommu,
     uint8_t devfn, struct pci_dev *pdev)
@@ -185,9 +195,7 @@ static int __must_check amd_iommu_setup_
         dte->ex = ivrs_dev->dte_allow_exclusion;
         dte->sys_mgt = MASK_EXTR(ivrs_dev->device_flags, 
ACPI_IVHD_SYSTEM_MGMT);
 
-        if ( pci_ats_device(iommu->seg, bus, pdev->devfn) &&
-             !ivrs_dev->block_ats &&
-             iommu_has_cap(iommu, PCI_CAP_IOTLB_SHIFT) )
+        if ( use_ats(pdev, iommu, ivrs_dev) )
             dte->i = ats_enabled;
 
         spin_unlock_irqrestore(&iommu->lock, flags);
@@ -248,9 +256,7 @@ static int __must_check amd_iommu_setup_
         ASSERT(dte->sys_mgt == MASK_EXTR(ivrs_dev->device_flags,
                                          ACPI_IVHD_SYSTEM_MGMT));
 
-        if ( pci_ats_device(iommu->seg, bus, pdev->devfn) &&
-             !ivrs_dev->block_ats &&
-             iommu_has_cap(iommu, PCI_CAP_IOTLB_SHIFT) )
+        if ( use_ats(pdev, iommu, ivrs_dev) )
             ASSERT(dte->i == ats_enabled);
 
         spin_unlock_irqrestore(&iommu->lock, flags);
@@ -268,9 +274,7 @@ static int __must_check amd_iommu_setup_
 
     ASSERT(pcidevs_locked());
 
-    if ( pci_ats_device(iommu->seg, bus, pdev->devfn) &&
-         !ivrs_dev->block_ats &&
-         iommu_has_cap(iommu, PCI_CAP_IOTLB_SHIFT) &&
+    if ( use_ats(pdev, iommu, ivrs_dev) &&
          !pci_ats_enabled(iommu->seg, bus, pdev->devfn) )
     {
         if ( devfn == pdev->devfn )




 


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