diff mbox series

[v3,04/10] iommu/dma: Add a helper function to reserve RMRs for IOMMU drivers

Message ID 20210420082751.1829-5-shameerali.kolothum.thodi@huawei.com (mailing list archive)
State Not Applicable, archived
Headers show
Series ACPI/IORT: Support for IORT RMR node | expand

Commit Message

Shameerali Kolothum Thodi April 20, 2021, 8:27 a.m. UTC 
IOMMU drivers can use this to implement their .get_resv_regions callback
for any RMR address regions specific to a device.

As per ACPI IORT E.b spec, a check is added to make sure OS has preserved
the PCIe configuration done by boot firmware.

Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
---
 drivers/iommu/dma-iommu.c | 35 +++++++++++++++++++++++++++++++++++
 include/linux/dma-iommu.h |  7 +++++++
 2 files changed, 42 insertions(+)

Comments

kernel test robot April 20, 2021, 12:07 p.m. UTC | #1 
Hi Shameer,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on pm/linux-next]
[also build test WARNING on arm/for-next soc/for-next arm64/for-next/core linus/master v5.12-rc8]
[cannot apply to iommu/next xlnx/master next-20210420]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Shameer-Kolothum/ACPI-IORT-Support-for-IORT-RMR-node/20210420-173125
base:   https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next
config: m68k-randconfig-m031-20210420 (attached as .config)
compiler: m68k-linux-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/2501962e423895e2e4f126ff5998b226f4803186
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Shameer-Kolothum/ACPI-IORT-Support-for-IORT-RMR-node/20210420-173125
        git checkout 2501962e423895e2e4f126ff5998b226f4803186
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross W=1 ARCH=m68k 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   In file included from drivers/iommu/rockchip-iommu.c:13:
>> include/linux/dma-iommu.h:94:71: warning: 'struct iommu_rmr' declared inside parameter list will not be visible outside of this definition or declaration
      94 | static void iommu_dma_get_rmr_resv_regions(struct device *dev, struct iommu_rmr *rmr,
         |                                                                       ^~~~~~~~~
   include/linux/dma-iommu.h:100:1: error: expected identifier or '(' before '{' token
     100 | {
         | ^
   In file included from drivers/iommu/rockchip-iommu.c:13:
   include/linux/dma-iommu.h:94:13: warning: 'iommu_dma_get_rmr_resv_regions' defined but not used [-Wunused-function]
      94 | static void iommu_dma_get_rmr_resv_regions(struct device *dev, struct iommu_rmr *rmr,
         |             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Kconfig warnings: (for reference only)
   WARNING: unmet direct dependencies detected for ADI_AXI_ADC
   Depends on IIO && HAS_IOMEM && OF
   Selected by
   - AD9467 && IIO && SPI


vim +94 include/linux/dma-iommu.h

    93	
  > 94	static void iommu_dma_get_rmr_resv_regions(struct device *dev, struct iommu_rmr *rmr,
    95						   struct list_head *list)
    96	{
    97	}
    98	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
kernel test robot April 20, 2021, 1:32 p.m. UTC | #2 
Hi Shameer,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on pm/linux-next]
[also build test WARNING on arm/for-next soc/for-next arm64/for-next/core linus/master v5.12-rc8]
[cannot apply to iommu/next xlnx/master next-20210420]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Shameer-Kolothum/ACPI-IORT-Support-for-IORT-RMR-node/20210420-173125
base:   https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next
config: arm-randconfig-r023-20210420 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project ca8eef7e3da8f750d7c7aa004fe426d1d34787ea)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://github.com/0day-ci/linux/commit/2501962e423895e2e4f126ff5998b226f4803186
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Shameer-Kolothum/ACPI-IORT-Support-for-IORT-RMR-node/20210420-173125
        git checkout 2501962e423895e2e4f126ff5998b226f4803186
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=arm 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   In file included from drivers/iommu/arm/arm-smmu/arm-smmu.c:24:
>> include/linux/dma-iommu.h:94:71: warning: declaration of 'struct iommu_rmr' will not be visible outside of this function [-Wvisibility]
   static void iommu_dma_get_rmr_resv_regions(struct device *dev, struct iommu_rmr *rmr,
                                                                         ^
   include/linux/dma-iommu.h:100:1: error: expected identifier or '('
   {
   ^
   1 warning and 1 error generated.


vim +94 include/linux/dma-iommu.h

    93	
  > 94	static void iommu_dma_get_rmr_resv_regions(struct device *dev, struct iommu_rmr *rmr,
    95						   struct list_head *list)
    96	{
    97	}
    98	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
diff mbox series

Patch

diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index a942cc04eee1..c624000bf230 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -191,6 +191,41 @@  void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list)
 }
 EXPORT_SYMBOL(iommu_dma_get_resv_regions);
 
+void iommu_dma_get_rmr_resv_regions(struct device *dev, struct iommu_rmr *rmr,
+				    struct list_head *list)
+{
+	int prot = IOMMU_READ | IOMMU_WRITE | IOMMU_NOEXEC | IOMMU_MMIO;
+	struct iommu_resv_region *region;
+	enum iommu_resv_type type;
+
+	/*
+	 * For ACPI, please make sure the OS has preserved the PCIe configuration
+	 * performed by the boot firmware(See IORT revision E.b).
+	 */
+	if (!is_of_node(dev_iommu_fwspec_get(dev)->iommu_fwnode) &&
+	    dev_is_pci(dev)) {
+		struct pci_dev *pdev = to_pci_dev(dev);
+		struct pci_host_bridge *host = pci_find_host_bridge(pdev->bus);
+
+		if (!host->preserve_config)
+			return;
+	}
+
+	if (rmr->flags & IOMMU_RMR_REMAP_PERMITTED)
+		type = IOMMU_RESV_DIRECT_RELAXABLE;
+	else
+		type = IOMMU_RESV_DIRECT;
+
+	region = iommu_alloc_resv_region(rmr->base_address,
+					 rmr->length, prot,
+					 type);
+	if (!region)
+		return;
+
+	list_add_tail(&region->list, list);
+}
+EXPORT_SYMBOL(iommu_dma_get_rmr_resv_regions);
+
 /**
  * iommu_dma_get_rmrs - Retrieve Reserved Memory Regions(RMRs) associated
  *                      with a given IOMMU
diff --git a/include/linux/dma-iommu.h b/include/linux/dma-iommu.h
index beb84c4fe5b1..dbad5073c9e0 100644
--- a/include/linux/dma-iommu.h
+++ b/include/linux/dma-iommu.h
@@ -40,6 +40,8 @@  void iommu_dma_get_resv_regions(struct device *dev, struct list_head *list);
 void iommu_dma_free_cpu_cached_iovas(unsigned int cpu,
 		struct iommu_domain *domain);
 
+void iommu_dma_get_rmr_resv_regions(struct device *dev, struct iommu_rmr *rmr,
+				    struct list_head *list);
 int iommu_dma_get_rmrs(struct fwnode_handle *iommu, struct list_head *list);
 struct iommu_rmr *iommu_dma_alloc_rmr(u64 base, u64 length, u32 sid, u32 flags);
 
@@ -89,6 +91,11 @@  static inline void iommu_dma_free_cpu_cached_iovas(unsigned int cpu,
 {
 }
 
+static void iommu_dma_get_rmr_resv_regions(struct device *dev, struct iommu_rmr *rmr,
+					   struct list_head *list)
+{
+}
+
 int iommu_dma_get_rmrs(struct fwnode_handle *iommu, struct list_head *list);
 {
 	return 0;