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Mon, 31 Mar 2025 20:22:03 +0000 (GMT) From: Matthew Rosato To: joro@8bytes.org, will@kernel.org, robin.murphy@arm.com, gerald.schaefer@linux.ibm.com, schnelle@linux.ibm.com Cc: hca@linux.ibm.com, gor@linux.ibm.com, agordeev@linux.ibm.com, svens@linux.ibm.com, borntraeger@linux.ibm.com, clg@redhat.com, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org Subject: [PATCH v4 2/5] iommu/s390: support cleanup of additional table regions Date: Mon, 31 Mar 2025 16:21:56 -0400 Message-ID: <20250331202159.85956-3-mjrosato@linux.ibm.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250331202159.85956-1-mjrosato@linux.ibm.com> References: <20250331202159.85956-1-mjrosato@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: hdqMQTEgj-xxIamRuDlm7ny0sOUtC5FM X-Proofpoint-GUID: hdqMQTEgj-xxIamRuDlm7ny0sOUtC5FM X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1095,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-03-31_09,2025-03-27_02,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 malwarescore=0 adultscore=0 mlxlogscore=974 spamscore=0 priorityscore=1501 lowpriorityscore=0 bulkscore=0 phishscore=0 suspectscore=0 impostorscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2502280000 definitions=main-2503310138 Content-Type: text/plain; charset="utf-8" Extend the existing dma_cleanup_tables to also handle region second and region first tables. Reviewed-by: Niklas Schnelle Signed-off-by: Matthew Rosato --- drivers/iommu/s390-iommu.c | 71 ++++++++++++++++++++++++++++++++++---- 1 file changed, 64 insertions(+), 7 deletions(-) diff --git a/drivers/iommu/s390-iommu.c b/drivers/iommu/s390-iommu.c index cad032d4c9a6..f2cda0ce0fe9 100644 --- a/drivers/iommu/s390-iommu.c +++ b/drivers/iommu/s390-iommu.c @@ -121,6 +121,22 @@ static inline int pt_entry_isvalid(unsigned long entry) return (entry & ZPCI_PTE_VALID_MASK) =3D=3D ZPCI_PTE_VALID; } =20 +static inline unsigned long *get_rf_rso(unsigned long entry) +{ + if ((entry & ZPCI_TABLE_TYPE_MASK) =3D=3D ZPCI_TABLE_TYPE_RFX) + return phys_to_virt(entry & ZPCI_RTE_ADDR_MASK); + else + return NULL; +} + +static inline unsigned long *get_rs_rto(unsigned long entry) +{ + if ((entry & ZPCI_TABLE_TYPE_MASK) =3D=3D ZPCI_TABLE_TYPE_RSX) + return phys_to_virt(entry & ZPCI_RTE_ADDR_MASK); + else + return NULL; +} + static inline unsigned long *get_rt_sto(unsigned long entry) { if ((entry & ZPCI_TABLE_TYPE_MASK) =3D=3D ZPCI_TABLE_TYPE_RTX) @@ -192,18 +208,59 @@ static void dma_free_seg_table(unsigned long entry) dma_free_cpu_table(sto); } =20 -static void dma_cleanup_tables(unsigned long *table) +static void dma_free_rt_table(unsigned long entry) { + unsigned long *rto =3D get_rs_rto(entry); int rtx; =20 - if (!table) + for (rtx =3D 0; rtx < ZPCI_TABLE_ENTRIES; rtx++) + if (reg_entry_isvalid(rto[rtx])) + dma_free_seg_table(rto[rtx]); + + dma_free_cpu_table(rto); +} + +static void dma_free_rs_table(unsigned long entry) +{ + unsigned long *rso =3D get_rf_rso(entry); + int rsx; + + for (rsx =3D 0; rsx < ZPCI_TABLE_ENTRIES; rsx++) + if (reg_entry_isvalid(rso[rsx])) + dma_free_rt_table(rso[rsx]); + + dma_free_cpu_table(rso); +} + +static void dma_cleanup_tables(struct s390_domain *domain) +{ + int rtx, rsx, rfx; + + if (!domain->dma_table) return; =20 - for (rtx =3D 0; rtx < ZPCI_TABLE_ENTRIES; rtx++) - if (reg_entry_isvalid(table[rtx])) - dma_free_seg_table(table[rtx]); + switch (domain->origin_type) { + case ZPCI_TABLE_TYPE_RFX: + for (rfx =3D 0; rfx < ZPCI_TABLE_ENTRIES; rfx++) + if (reg_entry_isvalid(domain->dma_table[rfx])) + dma_free_rs_table(domain->dma_table[rfx]); + break; + case ZPCI_TABLE_TYPE_RSX: + for (rsx =3D 0; rsx < ZPCI_TABLE_ENTRIES; rsx++) + if (reg_entry_isvalid(domain->dma_table[rsx])) + dma_free_rt_table(domain->dma_table[rsx]); + break; + case ZPCI_TABLE_TYPE_RTX: + for (rtx =3D 0; rtx < ZPCI_TABLE_ENTRIES; rtx++) + if (reg_entry_isvalid(domain->dma_table[rtx])) + dma_free_seg_table(domain->dma_table[rtx]); + break; + default: + WARN_ONCE(1, "Invalid IOMMU table (%x)\n", domain->origin_type); + return; + } =20 - dma_free_cpu_table(table); + dma_free_cpu_table(domain->dma_table); } =20 static unsigned long *dma_alloc_page_table(gfp_t gfp) @@ -358,7 +415,7 @@ static void s390_iommu_rcu_free_domain(struct rcu_head = *head) { struct s390_domain *s390_domain =3D container_of(head, struct s390_domain= , rcu); =20 - dma_cleanup_tables(s390_domain->dma_table); + dma_cleanup_tables(s390_domain); kfree(s390_domain); } =20 --=20 2.49.0